WO2024188007A1 - Display apparatus and transportation means - Google Patents

Abstract

A display apparatus (20) and a transportation means. The display apparatus (20) can be installed in the transportation means. The display apparatus (20) comprises an image generation unit (30) and an optical imaging unit (40). The image generation unit (30) is used for generating first image light (S1) and second image light (S2). The optical imaging unit (40) comprises a first optical device (41), a second optical device (42) and an optical waveguide (43), wherein the first optical device (41) is used for receiving the first image light (S1) and configuring a first focal power value, so as to generate third image light (S3), and coupling the third image light (S3) into the optical waveguide (43) from a coupling-in area (431) of the optical waveguide (43); the second optical device (42) is used for receiving the second image light (S2) and configuring a second focal power value, so as to generate fourth image light (S4), and coupling the fourth image light (S4) into the optical waveguide (43) from the coupling-in area (431) of the optical waveguide (43); the first focal power value is different from the second focal power value; and the optical waveguide (43) is used for coupling the third image light (S3) and the fourth image light (S4) out of a coupling-out area (432) of the optical waveguide (43). Compared with an existing apparatus, the display apparatus (20) has a smaller size.

Description

Display equipment and transportation

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on March 14, 2023, with application number 202310293328.6 and application name “Display Device and Vehicle”, all contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of optical display technology, and in particular to a display device and a vehicle.

Background Art

With the development of intelligent vehicles, more and more vehicles are equipped with head-up displays (HUD). HUD can project images including driving information to the front of the driver's field of vision. HUD allows the driver to see images including driving information in front of the field of vision while watching the road, reducing the possibility of the driver looking down at other devices installed on the vehicle during driving, thereby improving the driver's driving safety.

Among them, driving information includes instrument information and navigation information. HUD usually projects two images to display instrument information and navigation information respectively. Among them, the image including instrument information is smaller in size and has a short projection distance; the image including navigation information is larger in size and has a long projection distance. At present, HUDs that can project two images with different projection distances often have a larger volume. However, the space left for installing HUD in vehicles is limited, and a larger HUD may not be installed in vehicles.

Summary of the invention

An embodiment of the present application provides a display device and a vehicle. The display device can be installed in the vehicle, and the volume of the display device is smaller than that of existing display devices.

In a first aspect, a display device is provided, comprising: an image generating unit and an optical imaging unit; the optical imaging unit comprises a first optical device, a second optical device and an optical waveguide; the image generating unit is used to generate a first image light and a second image light; the first optical device is used to receive the first image light, configure a first optical focal length value for the first image light, generate a third image light, and couple the third image light from a coupling-in region of the optical waveguide into the optical waveguide; the second optical device is used to receive the second image light, configure a second optical focal length value for the second image light, generate a fourth image light, and couple the fourth image light from the coupling-in region of the optical waveguide into the optical waveguide, the first optical focal length value is different from the second optical focal length value; the optical waveguide is used to couple the third image light out of a coupling-out region of the optical waveguide; the optical waveguide is also used to couple the fourth image light out of the coupling-out region of the optical waveguide. In the display device, the image generating unit is used to generate a first image light and a second image light. The first optical device in the optical imaging unit receives the first image light, configures a first optical focal length value for the first image light, and generates a third image light. The third image light is coupled in from a coupling-in region of the optical waveguide and coupled out from a coupling-out region of the optical waveguide. The third image light is reflected multiple times in the optical waveguide. The optical waveguide achieves the effect of folding the transmission optical path of the third image light and amplifying the third image light, thereby causing the third image light to be imaged as a first image. The second optical device in the optical imaging unit receives the second image light, configures a second optical focal length value for the second image light, and generates a fourth image light. The fourth image light is coupled in from a coupling-in region of the optical waveguide and coupled out from a coupling-out region of the optical waveguide. The fourth image light is reflected multiple times in the optical waveguide. The optical waveguide achieves the effect of folding the transmission optical path of the fourth image light and amplifying the fourth image light, thereby causing the fourth image light to be imaged as a second image. The projection distance of the first image is negatively correlated with the first optical focal length value, and the projection distance of the second image is negatively correlated with the second optical focal length value. Since the first optical focal length value is not equal to the second optical focal length value, the projection distance of the first image is different from the projection distance of the second image, and the display device can project two images with different projection distances. In addition, the first optical device and the second optical device in the display device are respectively arranged on one side of the coupling-in region of the optical waveguide, so the size of the first optical device is irrelevant to the size of the third image light diffused after passing through the optical waveguide, and the size of the second optical device is irrelevant to the size of the fourth image light diffused after passing through the optical waveguide. The volumes of the first optical device and the second optical device can also be made relatively small, thereby reducing the volume of the display device.

Optionally, the first optical device includes one or more of the following: a lens, a curved reflector. In this optional manner, when the first optical device includes a lens, the optical focal value of the lens may be a first optical focal value. The lens may be one or more, and when there is one lens, the optical focal value of the lens is the first optical focal value, and when there are multiple lenses, the optical focal value of the multiple lenses combined is the first optical focal value. When the first optical device includes a curved reflector, the optical focal value of the curved reflector may be the first optical focal value. The curved reflector may be one or more, and when there is one curved reflector, the optical focal value of the curved reflector is the first optical focal value, and when there are multiple curved reflectors, the optical focal value of the multiple curved reflectors combined is the first optical focal value. Exemplarily, the first optical device may also be a combination of a lens and a curved reflector, and the optical focal value of the lens and the curved reflector combined is the first optical focal value, In this case, the curved reflector may first receive the first image light and reflect the first image light to the lens; or the lens may first receive the first image light and transmit the first image light to the curved reflector.

Optionally, the second optical device includes one or more of the following: a lens, a curved reflector. In this optional manner, when the second optical device includes a lens, the optical focal value of the lens may be the second optical focal value. Wherein, the lens may be one or more, and when there is one lens, the optical focal value of this lens is the second optical focal value, and when there are multiple lenses, the optical focal value of the combination of the multiple lenses is the second optical focal value. When the second optical device includes a curved reflector, the optical focal value of the curved reflector may be the second optical focal value. Wherein, the curved reflector may be one or more, and when there is one curved reflector, the optical focal value of this curved reflector is the second optical focal value, and when there are multiple curved reflectors, the optical focal value of the combination of the multiple curved reflectors is the second optical focal value. Exemplarily, the second optical device may be a combination of a lens and a curved reflector, and the optical focal length value of the combination of the lens and the curved reflector is a second optical focal length value. In this case, the curved reflector may first receive the second image light and reflect the second image light to the lens; or the lens may first receive the second image light and transmit the second image light to the curved reflector.

Optionally, the optical waveguide includes any one of the following: a geometric optical waveguide, a diffraction optical waveguide, and a holographic optical waveguide.

Optionally, the optical waveguide includes a two-dimensional optical waveguide. In this optional manner, the size of the coupling-in region of the two-dimensional optical waveguide is smaller than the size of the coupling-out region, so the size of the first optical device and the second optical device disposed on one side of the coupling-in region of the optical waveguide can be further reduced, further reducing the volume of the display device.

Optionally, the image generation unit includes a light modulator and a lens; the light modulator includes a first modulation area and a second modulation area; the first modulation area is used to generate a first image light according to the first image information; the second modulation area is used to generate a second image light according to the second image information; the lens is used to receive the first image light generated by the first modulation area and transmit the first image light to the first optical device; the lens is also used to receive the second image light generated by the second modulation area and transmit the second image light to the second optical device. In this optional method, the light modulator can generate the first image light and the second image light in different areas.

Optionally, the image generating unit also includes a light source; the light source is used to generate a light beam and transmit the light beam to the light modulator; a first modulation area is specifically used to modulate the light beam according to the first image information to generate the first image light; and a second modulation area is specifically used to modulate the light beam according to the second image information to generate the second image light.

Optionally, the image generating unit further includes a lighting element; a light source, specifically used to transmit the light beam to the lighting element; and the lighting element, used to shape the light beam and transmit the shaped light beam to the light modulator.

Optionally, the image generating unit further includes a first reflecting element; a light source, specifically used to transmit the light beam to the first reflecting element; and the first reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit further includes a second reflecting element; an illuminating element, specifically used to transmit the shaped light beam to the second reflecting element; and a second reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit also includes a display screen; the display screen includes a first display area and a second display area; a lens is specifically used to transmit the first image light to the first display area of the display screen; the first display area is used to display the first image light according to a first predetermined angle distribution; the first display area is also used to transmit the first image light to the first optical device; the lens is also specifically used to transmit the second image light to the second display area of the display screen; the second display area is used to display the second image light according to a second predetermined angle distribution; the second display area is also used to transmit the second image light to the second optical device.

Optionally, the image generating unit further includes a third reflecting element; a lens specifically used to transmit the first image light to the third reflecting element; the third reflecting element is used to reflect the first image light to the first display area of the display screen; the lens is also specifically used to transmit the second image light to the third reflecting element; the third reflecting element is used to reflect the second image light to the second display area of the display screen.

Optionally, the display device also includes a processor; the processor is used to send the first image information to the first modulation area of the light modulator; the processor is also used to send the second image information to the second modulation area of the light modulator.

In a second aspect, a display device is provided, including: an image generating unit and an optical imaging unit; the optical imaging unit includes an optical device, a predetermined reflecting element and an optical waveguide; the image generating unit is used to generate a first image light and a second image light; the predetermined reflecting element is used to receive the first image light and reflect the first image light to the optical device; the optical device is used to configure an optical focal value for the first image light, generate a third image light, and couple the third image light from the coupling-in area of the optical waveguide into the optical waveguide; the optical device is also used to receive the second image light, configure an optical focal value for the second image light, generate a fourth image light, and couple the fourth image light from the coupling-in area of the optical waveguide into the optical waveguide; the optical waveguide is used to couple the third image light from the coupling-out area of the optical waveguide; the optical waveguide is also used to couple the fourth image light from the coupling-out area of the optical waveguide. In the display device, the image generating unit is used to generate the first image light and the second image light, the predetermined reflecting element in the optical imaging unit receives the first image light and reflects the first image light to the optical device, the optical device configures an optical focal value for the first image light, generates the third image light, and couples the third image light from the coupling-in area of the optical waveguide into the optical waveguide. The optical waveguide is used for receiving the light of the third image light, the third image light is coupled into the optical waveguide from the coupling-in region, and is coupled out from the coupling-out region of the optical waveguide. The third image light is reflected multiple times in the optical waveguide. The optical waveguide realizes the effect of folding the transmission optical path of the third image light and amplifying the third image light, so that the third image light is imaged as the first image. The optical device in the optical imaging unit receives the second image light, configures the optical focal length value for the second image light, and generates the fourth image light. The fourth image light is coupled into the optical waveguide from the coupling-in region, and is coupled out from the coupling-out region of the optical waveguide. The fourth image light is reflected multiple times in the optical waveguide. The optical waveguide realizes the effect of folding the transmission optical path of the fourth image light and amplifying the fourth image light, so that the fourth image light is imaged as the second image. Among them, although the fixed optical device is configured with the same optical focal value for the first image light and the second image light, the second image light is directly transmitted to the optical device, and the first image light is reflected to the optical device through the predetermined reflective element, so the transmission path of the first image light to the optical device is longer than the transmission path of the second image light to the optical device, then the projection distance of the image formed by the third image light is greater than the projection distance of the image formed by the fourth image light, and the display device can project two images with different projection distances. In addition, the optical device and the predetermined reflective element in the display device are arranged on one side of the coupling region of the optical waveguide, so the size of the optical device is independent of the size of the third image light diffused after passing through the optical waveguide, and is also independent of the size of the fourth image light diffused after passing through the optical waveguide, and the volume of the optical device can also be made relatively small, thereby reducing the volume of the display device.

Optionally, the predetermined reflective element includes one or more of the following: a reflector, a reflective prism.

Optionally, the optical device includes one or more of the following: a lens, a curved reflector.

Optionally, the optical waveguide includes any one of the following: a one-dimensional geometric optical waveguide, a one-dimensional diffraction optical waveguide, and a one-dimensional holographic optical waveguide.

Optionally, the geometric optical waveguide includes a two-dimensional geometric optical waveguide; the diffraction optical waveguide includes a two-dimensional diffraction optical waveguide; and the holographic optical waveguide includes a two-dimensional holographic optical waveguide.

Optionally, the image generating unit includes an optical modulator and a lens; the optical modulator includes a first modulation area and a second modulation area; the first modulation area is used to generate a first image light according to the first image information; the second modulation area is used to generate a second image light according to the second image information; the lens is used to receive the first image light generated by the first modulation area, and transmit the first image light to a predetermined reflecting element; the lens is also used to receive the second image light generated by the second modulation area, and transmit the second image light to the optical device.

Optionally, the image generating unit also includes a light source; the light source is used to generate a light beam and transmit the light beam to the light modulator; a first modulation area is specifically used to modulate the light beam according to the first image information to generate the first image light; and a second modulation area is specifically used to modulate the light beam according to the second image information to generate the second image light.

Optionally, the image generating unit further includes a lighting element; a light source, specifically used to transmit the light beam to the lighting element; and the lighting element, used to shape the light beam and transmit the shaped light beam to the light modulator.

Optionally, the image generating unit further includes a first reflecting element; a light source, specifically used to transmit the light beam to the first reflecting element; and the first reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit further includes a second reflecting element; an illuminating element, specifically used to transmit the shaped light beam to the second reflecting element; and a second reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit also includes a display screen; the display screen includes a first display area and a second display area; a lens is specifically used to transmit the first image light to the first display area of the display screen; the first display area is used to display the first image light according to a first predetermined angle distribution; the first display area is also used to transmit the first image light to a predetermined reflective element; the lens is also specifically used to transmit the second image light to the second display area of the display screen; the second display area is used to display the second image light according to a second predetermined angle distribution; the second display area is also used to transmit the second image light to an optical device.

Optionally, the image generating unit further includes a third reflecting element; a lens specifically used to transmit the first image light to the third reflecting element; the third reflecting element is used to reflect the first image light to the first display area of the display screen; the lens is also specifically used to transmit the second image light to the third reflecting element; the third reflecting element is used to reflect the second image light to the second display area of the display screen.

Optionally, the display device also includes a processor; the processor is used to send the first image information to the first modulation area of the light modulator; the processor is also used to send the second image information to the second modulation area of the light modulator.

In a third aspect, a vehicle is provided, comprising a display device as described in any one of the first aspect or the second aspect, wherein the display device is installed on the vehicle.

Optionally, the vehicle also includes a windshield, which is used to receive the third image light emitted by the display device and reflect the third image light to the eyes of the driver of the vehicle; the windshield is also used to receive the fourth image light emitted by the display device and reflect the fourth image light to the eyes of the driver of the vehicle.

In a fourth aspect, a display device is provided, comprising: an image generating unit and an optical imaging unit; the optical imaging unit comprises an optical device and an optical waveguide; the image generating unit is used to generate a first image light; the optical device is used to receive the first image light and provide the first image The optical waveguide is configured with a focal value to generate a second image light, and the second image light is coupled into the optical waveguide from the coupling-in region of the optical waveguide; the optical waveguide is used to couple the second image light out from the coupling-out region of the optical waveguide. In the display device, the image generation unit is used to generate the first image light, and the optical device in the optical imaging unit receives the first image light, configures the focal value for the first image light, generates the second image light, and the second image light is coupled into the coupling-in region of the optical waveguide and coupled out from the coupling-out region of the optical waveguide. The optical waveguide realizes the folding of the transmission optical path of the second image light, so that the second image light is imaged into a predetermined image. The display device can project two images with different projection distances. For example, at a first moment, the image generating unit is used to generate a first image light, the optical device in the optical imaging unit receives the first image light, configures a first optical focal length value for the first image light, and generates a second image light. The second image light is coupled in from a coupling-in region of the optical waveguide and coupled out from a coupling-out region of the optical waveguide. The second image light is reflected multiple times in the optical waveguide, and the optical waveguide achieves the effect of folding the transmission optical path of the second image light and amplifying the second image light, thereby imaging the second image light as the first image; at a second moment, the image generating unit is used to generate a third image light, the optical device in the optical imaging unit receives the third image light, configures a second optical focal length value for the third image light, and generates a fourth image light. The fourth image light is coupled in from a coupling-in region of the optical waveguide and coupled out from a coupling-out region of the optical waveguide. The fourth image light is reflected multiple times in the optical waveguide, and the optical waveguide achieves the effect of folding the transmission optical path of the fourth image light and amplifying the fourth image light, thereby imaging the fourth image light as the second image. Furthermore, the optical device in the display device is arranged on one side of the coupling-in region of the optical waveguide, so the size of the optical device is irrelevant to the size of the second image light diffused after passing through the optical waveguide, and the volume of the optical device can also be made relatively small, thereby reducing the volume of the display device.

Optionally, the optical device includes one or more of the following: a lens, a curved reflector.

Optionally, the optical waveguide includes any one of the following: a geometric optical waveguide, a diffraction optical waveguide, and a holographic optical waveguide.

Optionally, the optical waveguide comprises a geometric optical waveguide.

Optionally, the image generating unit includes a light modulator and a lens; the light modulator is used to generate a first image light according to the image information; the lens is used to receive the first image light generated by the light modulator and transmit the first image light to the optical device.

Optionally, the image generating unit further includes a light source; the light source is used to generate a light beam and transmit the light beam to a light modulator; the light modulator is specifically used to modulate the light beam according to image information to generate a first image light.

Optionally, the image generating unit further includes a lighting element; a light source, specifically used to transmit the light beam to the lighting element; and the lighting element, used to shape the light beam and transmit the shaped light beam to the light modulator.

Optionally, the image generating unit further includes a first reflecting element; a light source, specifically used to transmit the light beam to the first reflecting element; and the first reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit further includes a second reflecting element; an illuminating element, specifically used to transmit the shaped light beam to the second reflecting element; and a second reflecting element, used to reflect the light beam to the light modulator.

Optionally, the image generating unit further includes a display screen; a lens, specifically used to transmit the first image light to the display screen; the display screen, used to display the first image light according to a predetermined angle distribution; the display screen, further used to transmit the first image light to the optical device.

Optionally, the image generating unit further includes a third reflecting element; a lens, specifically used to transmit the first image light to the third reflecting element; and the third reflecting element, used to reflect the first image light to the display screen.

Optionally, the display device also includes a processor; the processor is used to send image information to the light modulator.

In a fifth aspect, a vehicle is provided, comprising a display device as described in any one of the fourth aspects above, wherein the display device is installed on the vehicle.

Optionally, the vehicle further includes a windshield, and the windshield is used to receive the second image light emitted by the display device and reflect the second image light to the eyes of the driver of the vehicle.

Among them, the technical effects brought about by any possible implementation method of the second aspect and the fifth aspect can refer to the technical effects brought about by the implementation method of the first aspect mentioned above, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the principle of a head-up display installed in a vehicle provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a display device provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of an image generating unit in a display device provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of an image generating unit in a display device provided by another embodiment of the present application;

FIG5 is a schematic diagram of the structure of an image generating unit in a display device provided in yet another embodiment of the present application;

FIG6 is a schematic diagram of the structure of an image generating unit in a display device provided in yet another embodiment of the present application;

FIG7 is a schematic diagram of the structure of an image generating unit in a display device provided in another embodiment of the present application;

FIG8 is a schematic diagram of the structure of an optical device in a display device provided in an embodiment of the present application;

FIG9 is a schematic structural diagram of an optical device in a display device provided by another embodiment of the present application;

FIG10 is a schematic diagram of the structure of an optical waveguide in a display device provided in an embodiment of the present application;

FIG11 is a schematic structural diagram of an optical waveguide in a display device provided by another embodiment of the present application;

FIG12 is a schematic diagram of the structure of an optical waveguide in a display device provided by another embodiment of the present application;

FIG13 is a schematic structural diagram of a display device provided by another embodiment of the present application;

FIG14 is a schematic diagram of the structure of a display device provided in yet another embodiment of the present application;

FIG15 is a schematic diagram of the structure of an image generating unit in a display device provided in another embodiment of the present application;

FIG16 is a schematic diagram of the structure of an image generating unit in a display device provided in yet another embodiment of the present application;

FIG17 is a schematic diagram of the structure of an image generating unit in a display device provided in yet another embodiment of the present application;

FIG18 is a schematic diagram of the structure of an image generating unit in a display device provided in another embodiment of the present application;

FIG19 is a schematic diagram of the structure of an image generating unit in a display device provided in yet another embodiment of the present application;

FIG20 is a circuit diagram of a display device provided in an embodiment of the present application;

FIG21 is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

FIG. 22 is a functional schematic diagram of a vehicle provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

Unless otherwise defined, all scientific and technological terms used herein have the same meaning as those known to those of ordinary skill in the art. In the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and/or B, which may represent: A exists alone, A and B exist at the same time, and B exists alone, wherein A and B may be singular or plural. The character "/" generally indicates that the associated objects before and after are a kind of "or" relationship. "At least one of the following (individuals)" or its similar expressions refers to any combination of these items, including any combination of single items (individuals) or plural items (individuals). For example, at least one of a, b or c (individuals) may represent: a, b, c, a and b, a and c, b and c or a, b and c, wherein a, b and c may be single or multiple. In addition, in the embodiments of the present application, the words "first", "second" and the like do not limit the quantity and order.

In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

With the development of intelligent transportation, more and more transportation vehicles are equipped with head-up displays (HUD). HUD can project images including driving information onto the front of the driver's helmet or windshield. HUD allows the driver to see images including driving information in front of his field of vision while watching the road, avoiding the possibility of the driver lowering his head to look at other devices installed on the vehicle during driving, thereby improving the driver's driving safety.

Among them, driving information includes instrument information and navigation information. HUD usually projects two images for displaying instrument information and navigation information respectively. Among them, instrument information includes speed, fuel level and/or power level, water temperature and other general parameter information about the vehicle. The size of the image including instrument information projected by HUD is relatively small, and the projection distance is between 2 meters and 3 meters. Navigation information provides convenience for the driver to drive the vehicle. The size of the image including navigation information projected by HUD is relatively large, and the projection distance is between 7.5 meters and 10 meters.

As shown in FIG1 , an embodiment of the present application provides a schematic diagram of a HUD installed in a vehicle, wherein the vehicle includes a windshield 16. The HUD installed in the vehicle can project two images for displaying instrument information and navigation information respectively, wherein the HUD includes a picture generating unit (PGU) 11, a PGU 12, a reflector 13, a reflector 14, and a reflector 15. In order to better install the HUD in the vehicle, a dust cover and a bracket supporting the dust cover are usually provided to form a receiving cavity, and PGU 11, PGU 12, a reflector 13, a reflector 14, and a reflector 15 are provided in the receiving cavity.

Exemplarily, PGU11 is used to generate a first image light including instrument information, and PGU11 transmits the generated first image light to reflector 14, the first image light is reflected for the first time by reflector 14, reflected for the second time by reflector 15, and then transmitted to windshield 16 of the vehicle, reflected by windshield 16 to driver's eyes 17, and the driver's eyes 17 receive the first image light and then see The image F1 formed by the first image light is specifically a virtual image. The distance between the image F1 and the driver's eyes 17 is the virtual image distance, where the virtual image distance is also called the projection distance. The projection distance of the image F1 is positively correlated with the distance the first image light is transmitted from the PGU11 to the driver's eyes 17, and the projection distance of the image F1 is positively correlated with the size of the virtual image F1. PGU12 is used to generate a second image light including navigation information, and PGU12 transmits the generated second image light to the reflector 13. The second image light is reflected for the first time by the reflector 13, for the second time by the reflector 14, and for the third time by the reflector 15, and then transmitted to the windshield 16 of the vehicle, and reflected by the windshield 16 to the driver's eyes 17. The driver's eyes 17 receive the second image light and then view the image F2 formed by the second image light. Image F2 is specifically a virtual image. The distance between image F2 and the driver's eyes 17 is the virtual image distance, wherein the virtual image distance is also referred to as the projection distance. The projection distance of image F2 is positively correlated with the distance from the second image light transmitted from PGU12 to the driver's eyes 17, and the projection distance of image F2 is positively correlated with the size of the virtual image F2.

As shown in FIG1 , the reflector 14 and the reflector 15 realize folding of the transmission optical path of the first image light and the second image light. In some embodiments, at least one of the reflectors 14 and 15 is a curved reflector, and the curved reflector can realize configuration of optical focal length for the first image light and the second image light. Referring to FIG1 , the first image light and the second image light will both pass through the windshield 16, the reflector 15, and the reflector 14, but the first image light is directly transmitted from the PGU11 to the reflector 14, and the second image light is transmitted from the PGU12 to the reflector 14 through the reflector 13. The distance from the PGU11 to the driver's eyes 17 is less than the distance from the PGU12 to the driver's eyes 17, thereby making the projection distance of the image F1 less than the projection distance of the image F2, and the size of the image F1 is less than the size of the image F2.

It can be seen that in the HUD shown in FIG. 1, more reflective devices are required to realize the projection of two images with different projection distances, and the HUD shown in FIG. 1 increases the projection distance of the image F2 by setting a reflector. Therefore, when the projection distance of the image projected by the HUD shown in FIG. 1 is required to be larger, more reflectors need to be set in the HUD shown in FIG. 1, thereby making the volume of the HUD continuously larger. In addition, the size of the reflector 14 also needs to be made larger so that the first image light and the second image light are reflected at different positions of the reflector 14, and the size of the reflector 15 also needs to be made larger so that the first image light and the second image light are reflected at different positions of the reflector 15, which also makes the volume of the HUD continuously larger.

However, the space for installing the HUD in a vehicle is limited, and the relatively large HUD shown in FIG. 1 may not be installed in the vehicle.

Exemplarily, as shown in FIG. 2 , an embodiment of the present application provides a display device, which is smaller in size than the display device shown in FIG. 1 .

As shown in FIG. 2 , the display device 20 includes an image generating unit 30 and an optical imaging unit 40 .

Exemplarily, the image generating unit 30 is used to generate image light S1 and image light S2. When the display device 20 is installed in a vehicle, the image light S1 includes instrument information, and the image formed by the image light S1 can display the instrument information, and the image light S2 includes navigation information, and the image formed by the image light S2 can display the navigation information; or, the image light S1 includes navigation information, and the image formed by the image light S1 can display the navigation information, and the image light S2 includes instrument information, and the image formed by the image light S2 can display the instrument information.

The image generating unit 30 transmits the image light S1 and the image light S2 to the optical imaging unit 40 .

The optical imaging unit 40 is used for forming an image based on the image light S1.

The optical imaging unit 40 includes an optical device 41 , an optical device 42 and an optical waveguide 43 . The optical waveguide 43 includes an incoupling region 431 and an outcoupling region 432 .

Specifically, the image light S1 generated by the image generating unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 is used to receive the image light S1, configure the optical focal value D1 for the image light S1, and generate the image light S3. Then, the image light S3 has the optical focal value D1. According to the relationship between the optical focal value D and the focal length F, D=1/F, it can be known that the focal length of the image light S3 is 1/D1. According to the imaging of the image light S3 into the first image, the projection distance of the first image is positively correlated with the focal length of the image light S3, and negatively correlated with the optical focal value D of the image light S3. When the optical focal value D1 is determined, the projection distance of the first image will also be determined. The optical device 41 couples the image light S3 from the coupling region 431 of the optical waveguide 43 into the optical waveguide 43.

The optical waveguide 43 is used to couple the image light S3 out from the outcoupling region 432 of the optical waveguide 43 to form an image as a first image.

The image light S2 generated by the image generating unit 30 is transmitted to the optical device 42. The optical device 42 is used to receive the image light S2, configure the optical focal value D2 for the image light S2, and generate the image light S4. Then, the image light S4 has the optical focal value D2. According to the relationship between the focal value D and the focal length F (D=1/F), it can be known that the focal length of the image light S4 is 1/D2. According to the imaging of the image light S4 into the second image, the projection distance of the second image is positively correlated with the focal length of the image light S4, and the projection distance of the second image is negatively correlated with the focal value D of the image light S4. When the optical focal value D2 is determined, the projection distance of the second image will also be determined. The optical device 42 couples the image light S4 from the coupling region 431 of the optical waveguide 43 into the optical waveguide 43. The optical focal value D1 is not equal to the optical focal value D2, so the projection distance of the first image is not equal to the projection distance of the second image.

The optical waveguide 43 is used to couple the image light S4 out from the outcoupling region 432 of the optical waveguide 43 to form an image as a second image.

In the display device 20 shown in FIG2 , the image generating unit 30 is used to generate image light S1 and image light S2. The optical device 41 in the optical imaging unit 40 receives the image light S1, configures the optical focal value D1 for the image light S1, and generates image light S3. The image light S3 is coupled in from the coupling-in region of the optical waveguide 43 and coupled out from the coupling-out region of the optical waveguide 43. The image light S3 is reflected multiple times in the optical waveguide 43. The optical waveguide 43 realizes the folding of the transmission optical path of the image light S3 and the amplification of the image light S3. effect, thereby image light S3 is imaged as a first image; the optical device 42 in the optical imaging unit 40 receives the image light S2, configures the optical focal value D2 for the image light S2, generates the image light S4, the image light S4 is coupled in from the coupling-in region of the optical waveguide 43, and is coupled out from the coupling-out region of the optical waveguide 43, the image light S4 is reflected multiple times in the optical waveguide 43, and the optical waveguide 43 achieves the effect of folding the transmission optical path of the image light S4 and amplifying the image light S4, thereby image light S4 is imaged as a second image. Among them, the projection distance of the first image is negatively correlated with the optical focal value D1, and the projection distance of the second image is negatively correlated with the optical focal value D2. Since the optical focal value D1 is not equal to the optical focal value D2, the projection distance of the first image is different from the projection distance of the second image, and the display device 20 can project two images with different projection distances. Furthermore, the optical device 41 and the optical device 42 in the display device 20 are respectively arranged on one side of the coupling-in region of the optical waveguide 43. Therefore, the size of the optical device 41 is irrelevant to the size of the image light S3 diffused after passing through the optical waveguide 43, and the size of the optical device 42 is irrelevant to the size of the image light S4 diffused after passing through the optical waveguide 43. The volume of the optical device 41 and the optical device 42 can also be made relatively small, thereby reducing the volume of the display device 20.

The image light S3 and the image light S4 diffuse when being transmitted in the optical waveguide 43. For example, when the optical device 41 is disposed on one side of the outcoupling region of the optical waveguide 43, since the image light S3 diffuses when being transmitted in the optical waveguide 43, the volume of the optical device 41 needs to be set larger to receive the diffused image light S3.

Exemplarily, as shown in FIG. 3 , an embodiment of the present application provides a structural schematic diagram of an image generation unit 30, wherein the image generation unit 30 includes a light modulator 31 and a lens 32, wherein the light modulator 31 is used to generate image light S1 and image light S2 according to image information, specifically, the light modulator 31 includes a modulation area 310 and a modulation area 311, and the image information includes image information M1 and image information M2, specifically, the processor in the image generation unit 30 transmits the image information to the light modulator 31. The modulation area 310 is used to generate image light S1 according to the image information M1, and the modulation area 311 is used to generate image light S2 according to the image information M2. The light modulator 31 includes any one of the following: an organic light-emitting diode (OLED), a silicon-based OLED (Micro-OLED), a micron light-emitting diode (Micro-LED), and a sub-millimeter light-emitting diode (mini-LED). The light modulator 31 shown in FIG3 does not need an additional light source to provide light. The light modulator 31 shown in FIG3 is self-luminous. The light modulator 31 includes a liquid crystal layer. The modulation area 310 in the light modulator 31 is used to adjust the deflection direction of the liquid crystal in the liquid crystal layer corresponding to the modulation area 310 according to the received image information M1, so as to achieve the modulation of the self-luminescence of the light modulator 31 and generate image light S1, and the image light S1 includes the image information M1; the modulation area 311 in the light modulator 31 is used to adjust the deflection direction of the liquid crystal in the liquid crystal layer corresponding to the modulation area 311 according to the received image information M2, so as to achieve the modulation of the self-luminescence of the light modulator 31 and generate image light S2, and the image light S2 includes the image information M2. The light modulator 31 can realize the generation of image light S1 and image light S2 by partitioning.

The lens 32 is used to receive the image light S1 generated by the modulation area 310 of the light modulator 31, and transmit the image light S1 to the optical device 41 in the optical imaging unit 40 shown in Figure 2. The lens 32 is also used to receive the image light S2 generated by the modulation area 311 of the light modulator 31, and transmit the image light S2 to the optical device 42 in the optical imaging unit 40 shown in Figure 2. The lens 32 includes one or more lenses.

Exemplarily, referring to FIG4 , an embodiment of the present application provides a schematic diagram of the structure of another image generating unit 30, wherein, compared with the image generating unit 30 shown in FIG3 , the image generating unit shown in FIG4 further includes a light source 33, wherein the light source 33 is used to generate a light beam and transmit the light beam to the light modulator 31. The modulation area 310 in the light modulator 31 is specifically used to modulate the light beam emitted by the light source 33 according to the image information M1 to generate the image light S1, and the modulation area 311 in the light modulator 31 is specifically used to modulate the light beam emitted by the light source 33 according to the image information M2 to generate the image light S2. Therefore, the light modulator 31 shown in Figure 4 cannot emit light by itself, and the light modulator 31 is specifically a transmissive light modulator, which includes a transmissive liquid crystal display (LCD). The light modulator 31 includes a liquid crystal layer, and the modulation area 310 controls the deflection of liquid crystal molecules in the liquid crystal layer corresponding to the modulation area 310 according to the image information M1 to achieve modulation of the light beam transmitted from the light source 33 to the modulation area 310 of the light modulator 31, thereby generating image light S1, and the image light S1 includes the image information M1; the modulation area 311 controls the deflection of liquid crystal molecules in the liquid crystal layer corresponding to the modulation area 311 according to the image information M2 to achieve modulation of the light beam transmitted from the light source 33 to the modulation area 311 of the light modulator 31, thereby generating image light S2, and the image light S2 includes the image information M2.

Exemplarily, as shown in FIG4 , the image generating unit 30 further includes an illumination element 34, wherein the illumination element 34 is located between the light source 33 and the light modulator 31 on the transmission optical path of the light beam generated by the light source 33, and the illumination element 34 includes one or more lenses, and the illumination element 34 is used to shape the light beam emitted by the light source 33, and transmit the shaped light beam to the light modulator 31. Exemplarily, the purpose of the illumination element 34 shaping the light beam emitted by the light source 33 is to enable the shaped light beam to be transmitted to the modulation area 310 and the modulation area 311 of the light modulator 31; The incident angle of the shaped light beam transmitted to the light modulator 31 meets the requirements of the light modulator 31. Different light modulators 31 have different requirements on the incident angle of the light beam.

Exemplarily, referring to FIG5 , compared with the image generating unit 30 shown in FIG4 , the image generating unit 30 shown in FIG5 further includes a reflecting element R1. When the image generating unit 30 includes an illuminating element 34, the reflecting element R1 is located between the illuminating element 34 and the optical modulator 31 on the transmission optical path of the light beam generated by the light source 33, and the reflecting element R1 is used to receive the light beam emitted by the illuminating element 34 and reflect the light beam to the modulation area 310 and the modulation area 311 of the optical modulator 31; when the image generating unit 30 does not include the illuminating element 34, the reflecting element R1 is located between the illuminating element 34 and the optical modulator 31 on the transmission optical path of the light beam generated by the light source 33, and the reflecting element R1 is used to receive the light beam emitted by the light source 33 and reflect the light beam to the modulation area 310 and the modulation area 311 of the optical modulator 31. Among them, the light modulator 31 shown in Figure 5 is specifically a reflective light modulator, and the light modulator 31 includes a digital micro-mirror device (DMD), liquid crystal on silicon (LCOS), and micro electro mechanical systems (MEMS).

Exemplarily, as shown in FIG6 , compared with the image generating unit 30 shown in FIG5 , the image generating unit shown in FIG6 further includes a display screen 35, wherein the display screen 35 is specifically a transmissive display screen, and the display screen includes a display area 350 and a display area 351; the lens 32 is specifically used to transmit the image light S1 to the display area 350 of the display screen 35, the display area 350 of the display screen 35 is used to receive the image light S1, and display the image light S1 according to a first predetermined angle distribution, and the display area 350 of the display screen 35 is also used to transmit the image light S1 to the optical device 41 in the optical imaging unit 40 shown in FIG2 ; the lens 32 is also specifically used to transmit the image light S2 to the display area 351 of the display screen 35, the display area 351 of the display screen 35 is used to receive the image light S2, and display the image light S2 according to a second predetermined angle distribution, and the display area 351 of the display screen 35 is also used to transmit the image light S2 to the optical device 42 in the optical imaging unit 40 shown in FIG2 .

Exemplarily, as shown in Figure 7, compared with the image generating unit 30 shown in Figure 6, the image generating unit shown in Figure 7 also includes a reflective element R2, wherein the display screen 35 is specifically a reflective display screen, and the lens 32 is specifically used to transmit the image light S1 to the reflective element R2, and the reflective element R2 is used to receive the image light S1 and reflect the image light S1 to the display area 350 of the display screen 35; the lens 32 is also specifically used to transmit the image light S2 to the reflective element R2, and the reflective element R2 is also used to receive the image light S2 emitted by the lens 32, and reflect the image light S2 to the display area 351 of the display screen 35.

Exemplarily, the light modulator 31 shown in FIG. 6 or 7 is specifically a reflective light modulator. In other embodiments, the light modulator shown in FIG. 6 or 7 may also be a transmissive light modulator as shown in FIG. 5 , and the embodiments of the present application are not limited to this.

Exemplarily, in the image generation unit 30 shown in any one of FIG. 3 to FIG. 7 , the image information M1 received by the light modulator 31 may be instrument information, then the image light S1 includes the instrument information, and the image information M2 received by the light modulator 31 may be navigation information, then the image light S2 includes the navigation information; or, the image information M1 received by the light modulator 31 may be navigation information, then the image light S1 includes the navigation information, and the image information M2 received by the light modulator 31 may be instrument information, then the image light S2 includes the instrument information. The embodiments of the present application do not limit the image information. When the display device 20 shown in FIG. 2 is a display device in an optical desktop display, the image information M1 and the image information M2 received by the light modulator 31 may also be any two different display information.

The image light S1 generated by the image generating unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 first receives the image light S1. The optical device 41 includes one or more of the following: a lens, a curved reflector.

Exemplarily, the optical device 41 is used to receive image light S1, configure an optical focal value D1 for the image light S1, and generate image light S3. Referring to FIG8 , when the optical device 41 includes a lens, the optical focal value of the lens may be D1. The lens may be one or more. When there is one lens, the optical focal value of the lens is D1. When there are more than one lenses, the optical focal value of the multiple lenses combined is D1. Referring to FIG9 , when the optical device 41 includes a curved reflector, the optical focal value of the curved reflector may be D1. The curved reflector may be one or more. When there is one curved reflector, the optical focal value of the curved reflector is D1. When there are more than one curved reflector, the optical focal value of the multiple curved reflectors combined is D1. Exemplarily, the optical device 41 may also be a combination of a lens and a curved reflector, and the optical focal length value of the combination of the lens and the curved reflector is D1. In this case, the curved reflector may first receive the image light S1 and reflect the image light S1 to the lens; or the lens may first receive the image light S1 and transmit the image light S1 to the curved reflector.

The optical imaging unit 40 further includes an optical waveguide 43 . The optical device 41 generates image light S3 , and the optical device 41 couples the image light S3 from a coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43 . The optical waveguide 43 is used to couple the image light S3 out from a coupling-out region 432 of the optical waveguide 43 .

The image light S2 generated by the image generating unit 30 is transmitted to the optical imaging unit 40. The optical device 42 in the optical imaging unit 40 first receives the image light S2. The optical device 42 includes one or more of the following: a lens, a curved reflector.

Exemplarily, the optical device 42 is used to receive the image light S2, configure the focal length value D2 for the image light S2, and generate the image light S4. Referring to FIG8 , when the optical device 42 includes a lens, the focal length value of the lens may be D2. The lens may be one or more. When there is one lens, the focal length value of the lens is D2. When there are more than one lens, the focal length value of the lens after the combination of the multiple lenses is D2. D2. As shown in FIG9 , when the optical device 42 includes a curved reflector, the focal length value of the curved reflector may be D1. The curved reflector may be one or more. When there is one curved reflector, the focal length value of the curved reflector is D2. When there are more than one curved reflector, the focal length value of the plurality of curved reflectors combined is D2. Exemplarily, the optical device 42 may also be a combination of a lens and a curved reflector, and the focal length value of the lens and the curved reflector combined is D2. In this case, the curved reflector may first receive the image light S2 and reflect the image light S2 to the lens; or the lens may first receive the image light S2 and transmit the image light S2 to the curved reflector.

The optical imaging unit 40 further includes an optical waveguide 43 . The optical device 42 generates image light S4 , and the optical device 42 couples the image light S4 from a coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43 . The optical waveguide 43 is used to couple the image light S4 out from a coupling-out region 432 of the optical waveguide 43 .

Specifically, the image light S3 is coupled into the optical waveguide 43 from the first region of the coupling-in region 431 of the optical waveguide 43, and the image light S4 is coupled into the optical waveguide 43 from the second region of the coupling-in region 431 of the optical waveguide 43, and the first region and the second region do not overlap. The image light S3 is coupled out from the third region of the coupling-out region 432 of the optical waveguide 43, and the image light S4 is coupled out from the fourth region of the coupling-out region 432 of the optical waveguide 43, and the third region and the fourth region may overlap or not overlap, which is not limited in the embodiments of the present application.

The optical waveguide 43 includes the geometric optical waveguide shown in FIG. 10 , the diffraction optical waveguide shown in FIG. 11 , and the holographic optical waveguide shown in FIG. 12 .

Referring to FIG10 , an embodiment of the present application provides a schematic structural diagram of a geometric optical waveguide, wherein, as shown in (a) of FIG10 , the geometric optical waveguide includes a prism waveguide 4301 and a planar waveguide 4302, wherein the prism waveguide 4301 is generally used as a coupling-in region 431 of the geometric optical waveguide, and the planar waveguide 4302 includes a plurality of waveguide plates arranged in an array, wherein, referring to the arrangement direction of the geometric optical waveguide shown in (a) of FIG10 , the plurality of waveguide plates are arranged in an array from left to right, wherein a film is applied to the left side surface (and/or the right side surface) of any waveguide plate so that a portion of the light transmitted through the left side surface (and/or the right side surface) of the waveguide plate is transmitted and another portion is reflected, and the refractive index and reflectivity of each of the plurality of waveguide plates arranged in the array are controlled by coating, thereby achieving an effect of coupling out the light beam in a predetermined region of the plurality of waveguide plates arranged in the array, and the predetermined region is the coupling-out region 432 of the geometric optical waveguide.

Referring to (a) in Figure 10, the optical device 41 couples the image light S3 from the prism waveguide 4301 of the geometric light waveguide into the geometric light waveguide, and the image light S3 is transmitted in the geometric light waveguide, reflected and/or transmitted through the left surface (and/or right surface) of the plurality of waveguide plates arranged in an array in the planar waveguide, and totally reflected on the upper and lower surfaces of the planar waveguide, and then coupled out from a predetermined area of the planar waveguide 4302 of the geometric light waveguide; the optical device 42 couples the image light S4 from the prism waveguide 4301 of the geometric light waveguide into the geometric light waveguide, and the image light S4 is transmitted in the geometric light waveguide, reflected and/or transmitted through the left surface (and/or right surface) of the plurality of waveguide plates arranged in an array in the planar waveguide, and totally reflected on the upper and lower surfaces of the planar waveguide, and then coupled out from a predetermined area of the planar waveguide 4302 of the geometric light waveguide.

As shown in (b) of FIG. 10 , an embodiment of the present application provides another structure of a geometric optical waveguide, wherein the geometric optical waveguide includes a glass substrate 4303, and a microstructure array Z1 and a microstructure array Z2 disposed on the surface of the glass substrate 4303. Exemplarily, the microstructure array Z1 and the microstructure array Z2 may be disposed on the same surface of the glass substrate 4303, or the microstructure array Z1 and the microstructure array Z2 may be disposed on different surfaces of the glass substrate 4303. The microstructure array Z1 is disposed so that the transmission direction of the light transmitted to the microstructure array Z1 is deflected at a predetermined angle, so that the light is totally reflected in the glass substrate 4303, and then the light is transmitted to the microstructure array Z2. The microstructure array Z2 is disposed so that the transmission direction of the light transmitted to the microstructure array Z2 is deflected at a predetermined angle, and the light is emitted from the glass substrate 4303. Therefore, the microstructure array Z1 and the area of the glass substrate 4303 covered by the microstructure array Z1 are called the coupling-in area 431 of the geometric light waveguide, and the microstructure array Z2 and the area of the glass substrate 4303 covered by the microstructure array Z2 are called the coupling-out area 432 of the geometric light waveguide.

As shown in (b) of FIG10 , the optical device 41 couples the image light S3 from the coupling-in region of the geometric light guide into the geometric light guide. The image light S3 is transmitted to the microstructure array Z1 in the coupling-in region of the geometric light guide. The microstructure array Z1 causes the transmission direction of the image light S3 to deflect by a predetermined angle, thereby causing the image light S3 to be totally reflected in the glass matrix 4303 and transmitted to the microstructure array Z2. The microstructure array Z2 causes the transmission direction of the image light S3 to deflect by a predetermined angle, thereby transmitting the image light S3 from the glass matrix 4303 to the microstructure array Z2. The out-coupling area is coupled out; the optical device 42 couples the image light S4 from the coupling-in area of the geometric light waveguide into the geometric light waveguide, and the image light S4 is transmitted to the microstructure array Z1 in the coupling-in area of the geometric light waveguide. The microstructure array Z1 causes the transmission direction of the image light S4 to be deflected at a predetermined angle, thereby causing the image light S4 to be totally reflected in the glass matrix 4303 and transmitted to the microstructure array Z2. The microstructure array Z2 causes the transmission direction of the image light S4 to be deflected at a predetermined angle, thereby coupling out from the out-coupling area of the geometric light waveguide.

For example, in some other embodiments, the geometric light waveguide shown in (b) of FIG. 10 may not be provided with the microstructure array Z1, but a prism waveguide may be provided as the coupling region of the geometric light waveguide shown in (b) of FIG. 10 , and the embodiments of the present application are not limited to this.

Referring to FIG. 11 , an embodiment of the present application provides a schematic structural diagram of a diffractive optical waveguide, wherein the diffractive optical waveguide includes a glass substrate 4303, a grating structure 4304 disposed on the surface of the glass substrate 4303, and a grating structure 4305 disposed on the surface of the glass substrate 4303. For example, the grating structure 4304 and the grating structure 4305 can be disposed on the same surface of the glass substrate 4303, or the grating structure 4304 and the grating structure 4305 can be disposed on different surfaces of the glass substrate 4303. The grating structure 4304 can be formed by semiconductor etching, nanocompression, or the like. The grating structure 4305 can be formed by semiconductor etching, nanoimprinting and other technologies. By setting the grating period of the grating structure 4304, the transmission direction of the light transmitted to the grating structure 4304 is deflected by a predetermined angle, and then it is totally reflected in the glass substrate 4303 and then transmitted to the grating structure 4305. By setting the grating period of the grating structure 4305, the transmission direction of the light transmitted to the grating structure 4305 is deflected by a predetermined angle and then emitted from the glass substrate 4303. Therefore, the grating structure 4304 and the area of the glass substrate 4303 covered by the grating structure 4304 are referred to as the coupling-in area 431 of the diffraction light waveguide, and the grating structure 4305 and the area of the glass substrate 4303 covered by the grating structure 4305 are referred to as the coupling-out area 432 of the diffraction light waveguide.

11 , the optical device 41 couples the image light S3 from the coupling-in region of the diffraction light waveguide into the diffraction light waveguide. The image light S3 is transmitted to the grating structure 4304 in the coupling-in region of the diffraction light waveguide. The grating structure 4304 causes the transmission direction of the image light S3 to be deflected by a predetermined angle, thereby causing the image light S3 to be totally reflected in the glass substrate 4303 and transmitted to the grating structure 4305. The grating structure 4305 causes the transmission direction of the image light S3 to be deflected by a predetermined angle, thereby transmitting the image light S3 from the coupling-out region of the diffraction light waveguide. The optical device 42 couples the image light S4 from the coupling-in region of the diffraction light waveguide into the diffraction light waveguide, and the image light S4 is transmitted to the grating structure 4304 in the coupling-in region of the diffraction light waveguide. The grating structure 4304 causes the transmission direction of the image light S4 to be deflected at a predetermined angle, thereby causing the image light S4 to be totally reflected in the glass matrix 4303 and transmitted to the grating structure 4305. The grating structure 4305 causes the transmission direction of the image light S4 to be deflected at a predetermined angle, and then coupled out from the coupling-out region of the diffraction light waveguide.

12, an embodiment of the present application provides a schematic structural diagram of a holographic optical waveguide, wherein the holographic optical waveguide includes a glass substrate 4303, and a holographic grating structure 4306 and a holographic grating structure 4307 are arranged on the surface of the glass substrate 4303. Exemplarily, the holographic grating structure 4306 and the holographic grating structure 4307 can be arranged on the same surface of the glass substrate 4303, or the holographic grating structure 4306 and the holographic grating structure 4307 can be arranged on different surfaces of the glass substrate 4303. The manufacturing method of the holographic grating structure 4306 and the holographic grating structure 4307 includes: coating a photosensitive material, exposing the photosensitive material by generating interference fringes with two laser beams, thereby causing a refractive index difference to appear in the photosensitive material. By setting the refractive index difference in the holographic grating structure 4306, the transmission direction of the light transmitted to the holographic grating structure 4306 is deflected at a predetermined angle, and then the light is totally reflected in the glass substrate 4303 and transmitted to the holographic grating structure 4307. By setting the refractive index difference in the holographic grating structure 4307, the transmission direction of the light transmitted to the holographic grating structure 4307 is deflected at a predetermined angle, and then the light is emitted from the glass substrate 4303. Therefore, the holographic grating structure 4306 and the area of the glass substrate 4303 covered by the holographic grating structure 4306 are referred to as the coupling-in area 431 of the holographic optical waveguide, and the holographic grating structure 4307 and the area of the glass substrate 4303 covered by the holographic grating structure 4307 are referred to as the coupling-out area 432 of the holographic optical waveguide.

12 , the optical device 41 couples the image light S3 from the coupling-in region 431 of the holographic waveguide into the holographic waveguide, and the image light S3 is transmitted to the holographic grating structure 4306 in the coupling-in region of the holographic waveguide. The holographic grating structure 4306 causes the transmission direction of the image light S3 to be deflected by a predetermined angle, thereby causing the image light S3 to be totally reflected in the glass substrate 4303 and transmitted to the holographic grating structure 4307. The holographic grating structure 4307 causes the transmission direction of the image light S3 to be deflected by a predetermined angle, thereby transmitting the image light S3 from the coupling-out region 431 of the holographic waveguide to the holographic waveguide. 2 out-coupling; the optical device 42 couples the image light S4 from the coupling-in region 431 of the holographic waveguide into the holographic waveguide, and the image light S4 is transmitted to the holographic grating structure 4306 in the coupling-in region of the holographic waveguide, and the holographic grating structure 4306 causes the transmission direction of the image light S4 to be deflected by a predetermined angle, thereby causing the image light S4 to be totally reflected in the glass matrix 4303 and transmitted to the holographic grating structure 4307, and the holographic grating structure 4307 causes the transmission direction of the image light S4 to be deflected by a predetermined angle, and then coupled out from the out-coupling region 432 of the holographic waveguide.

Exemplarily, the optical waveguide 43 may be a one-dimensional optical waveguide or a two-dimensional optical waveguide. Exemplarily, the geometric optical waveguide may be a one-dimensional geometric optical waveguide or a two-dimensional geometric optical waveguide. The diffraction optical waveguide may be a one-dimensional diffraction optical waveguide or a two-dimensional diffraction optical waveguide. The holographic optical waveguide may be a one-dimensional holographic optical waveguide or a two-dimensional holographic optical waveguide. The embodiments of the present application do not limit this. Exemplarily, the image light can only diffuse in one direction in a one-dimensional optical waveguide, while the image light can diffuse in two different directions in a two-dimensional optical waveguide. Moreover, the coupling region of the two-dimensional optical waveguide is smaller in size. Therefore, when the optical waveguide 43 is a two-dimensional optical waveguide, the size of the optical device 41 and the optical device 42 disposed on one side of the coupling region of the optical waveguide can be further reduced, thereby further reducing the volume of the display device 20.

Exemplarily, as shown in FIG. 13 , an embodiment of the present application provides another display device 20 , wherein the display device 20 includes an image generating unit 30 and an optical imaging unit 40 .

Exemplarily, the image generating unit 30 is used to generate image light S1 and image light S2. When the display device 20 is installed in a vehicle, the image light S1 includes instrument information, and the image formed by the image light S1 can display the instrument information, and the image light S2 includes navigation information, and the image formed by the image light S2 can display the navigation information; or, the image light S1 includes navigation information, and the image formed by the image light S1 can display the navigation information, and the image light S2 includes instrument information, and the image formed by the image light S2 can display the instrument information.

The image generating unit 30 transmits the image light S1 and the image light S2 to the optical imaging unit 40 .

The optical imaging unit 40 is used for forming an image based on the image light S1.

The optical imaging unit 40 includes an optical device 41 , a predetermined reflective element 44 and an optical waveguide 43 . The optical waveguide 43 includes an incoupling region 431 and an outcoupling region 432 .

Specifically, the image light S1 generated by the image generation unit 30 is transmitted to the optical imaging unit 40, and the predetermined reflection element 44 in the optical imaging unit 40 receives the image light S1 and reflects the image light S1 to the optical device 41. The predetermined reflection element 44 includes one or more of the following reflectors and reflection prisms, wherein when the predetermined reflection element 44 includes one reflector, the predetermined reflection element 44 reflects the received image light S1 once to the optical device 41; when the predetermined reflection element 44 includes multiple reflectors, the predetermined reflection element 44 reflects the received image light S1 multiple times to the optical device 41. The optical device 41 is used to configure the optical focal value for the image light S1 to generate the image light S3. The optical device 41 couples the image light S3 into the optical waveguide 43 from the coupling-in region 431 of the optical waveguide 43.

The optical waveguide 43 is used to couple the image light S3 out from the outcoupling region 432 of the optical waveguide 43 to form an image as a first image.

The image light S2 generated by the image generating unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 is used to receive the image light S2, configure the optical focal length value for the image light S2, and generate the image light S4. The optical device 41 couples the image light S4 into the optical waveguide 43 from the coupling-in region 431 of the optical waveguide 43.

The optical waveguide 43 is used to couple the image light S4 out from the outcoupling region 432 of the optical waveguide 43 to form an image as a second image.

In the display device 20 shown in FIG13 , the optical device 41 includes one or more of the following: a lens, a curved reflector. After the optical device 41 is determined, the focal length value of the optical device 41 can be determined. Then, the focal length value configured by the optical device 41 for the image light S1 and the image light S2 is the same. However, the image light S2 is directly transmitted to the optical device 41, and the image light S1 is reflected to the optical device 41 by the predetermined reflective element 44. Therefore, the transmission path of the image light S1 to the optical device 41 is longer than the transmission path of the image light S2 to the optical device 41. Then, the projection distance of the image formed by the image light S3 is greater than the projection distance of the image formed by the image light S4. The display device 20 can project two images with different projection distances.

Exemplarily, the image generating unit 30 in FIG13 may be the image generating unit 30 shown in any one of FIG3 to FIG7. When the image generating unit 30 in FIG13 is specifically the image generating unit shown in any one of FIG3 to FIG5, the lens 32 shown in any one of FIG3 to FIG5 is used to receive the image light S1 generated by the modulation area 310 of the light modulator 31, and transmit the image light S1 to the predetermined reflective element 44 in the optical imaging unit 40 shown in FIG13, and the lens 32 is also used to receive the image light S2 generated by the modulation area 311 of the light modulator 31, and transmit the image light S2 to the optical device 41 in the optical imaging unit 40 shown in FIG13. The lens 32 includes one or more lenses.

When the image generating unit 30 in FIG13 is specifically the image generating unit shown in FIG6 or FIG7 , the lens 32 in FIG6 or FIG7 is specifically used to transmit the image light S1 to the display area 350 of the display screen 35, the display area 350 of the display screen 35 is used to receive the image light S1, and display the image light S1 according to a first predetermined angle distribution, and the display area 350 of the display screen 35 is also used to transmit the image light S1 to the predetermined reflecting element 44 in the optical imaging unit 40 shown in FIG13 ; the lens 32 is also specifically used to transmit the image light S2 to the display area 351 of the display screen 35, the display area 351 of the display screen 35 is used to receive the image light S2, and display the image light S2 according to a second predetermined angle distribution, and the display area 351 of the display screen 35 is also used to transmit the image light S2 to the optical device 41 in the optical imaging unit 40 shown in FIG13 .

Exemplarily, as shown in FIG. 14 , an embodiment of the present application provides another display device 20 , wherein the display device 20 includes an image generating unit 30 and an optical imaging unit 40 .

The image generating unit 30 is used to generate image light S1 .

The image generating unit 30 transmits the image light S1 to the optical imaging unit 40 .

The optical imaging unit 40 is used for forming an image based on the image light S1.

The optical imaging unit 40 includes an optical device 41 and an optical waveguide 43 . The optical waveguide 43 includes an incoupling region 431 and an outcoupling region 432 .

Specifically, the image light S1 generated by the image generating unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 is used to receive the image light S1, configure the optical focal length value for the image light S1, and generate the image light S3. The optical device 41 couples the image light S3 into the optical waveguide 43 from the coupling region 431 of the optical waveguide 43.

The optical waveguide 43 is used to couple the image light S3 out from the outcoupling region 432 of the optical waveguide 43 to form an image as a first image.

Exemplarily, in the display device 20 shown in FIG14, at a first moment, the image generating unit 30 is used to generate image light S1; the optical device 41 receives the image light S1, configures the optical focal value D1 for the image light S1, generates image light S3, and couples the image light S3 from the coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43; the optical waveguide 43 is used to couple the image light S3 out from the coupling-out region 432 of the optical waveguide 43, thereby forming an image as a first image. At a second moment, the image generating unit 30 is used to generate image light S2; the optical device 41 receives the image light S2, configures the optical focal value D2 for the image light S2, generates image light S4, couples the image light S4 from the coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43; the optical waveguide 43 is used to couple the image light S4 out from the coupling-out region 432 of the optical waveguide 43, thereby forming an image as a second image. Then, the display device 20 shown in FIG14 can project two images with different projection distances in a time-sharing manner.

Exemplarily, as shown in FIG. 15 , an embodiment of the present application provides a schematic diagram of the structure of an image generation unit 30, wherein the image generation unit 30 includes a light modulator 31 and a lens 32, wherein the light modulator 31 is used to generate image light S1 according to image information, specifically, the image information includes image information M1 and image information M2, specifically, the processor in the image generation unit 30 transmits the image information to the light modulator 31. Wherein, at a first moment, the light modulator 31 is used to generate image light S1 according to the image information M1, and at a second moment, the light modulator 31 is used to generate image light S2 according to the image information M2. Wherein, the light modulator 31 includes any of the following: an organic light-emitting diode (OLED), a silicon-based OLED (Micro-OLED), a micron light-emitting diode (Micro-LED), and a sub-millimeter light-emitting diode (mini-LED). Among them, the light modulator 31 shown in Figure 15 does not require an additional light source to provide light. The light modulator 31 shown in Figure 3 is self-luminous, and the light modulator 31 includes a liquid crystal layer. Among them, at a first moment, the light modulator 31 is used to adjust the deflection direction of the liquid crystal in the liquid crystal layer according to the received image information M1, so as to realize the modulation of the self-luminescence of the light modulator 31 and generate image light S1, and the image light S1 includes the image information M1; at a second moment, the light modulator 31 is used to adjust the deflection direction of the liquid crystal in the liquid crystal layer according to the received image information M2, so as to realize the modulation of the self-luminescence of the light modulator 31 and generate image light S2, and the image light S2 includes the image information M2.

At the first moment, the lens 32 is used to receive the image light S1 generated by the light modulator 31, and transmit the image light S1 to the optical device 41 in the optical imaging unit 40 shown in Figure 14; at the second moment, the lens 32 is also used to receive the image light S2 generated by the light modulator 31, and transmit the image light S2 to the optical device 41 in the optical imaging unit 40 shown in Figure 14. The lens 32 includes one or more lenses.

Exemplarily, referring to FIG16, an embodiment of the present application provides a schematic diagram of the structure of another image generating unit 30, wherein, compared with the image generating unit 30 shown in FIG15, the image generating unit shown in FIG16 further includes a light source 33, wherein the light source 33 is used to generate a light beam and transmit the light beam to the light modulator 31. At a first moment, the light modulator 31 is specifically used to modulate the light beam emitted by the light source 33 according to the image information M1 to generate image light S1, and at a second moment, the light modulator 31 is specifically used to modulate the light beam emitted by the light source 33 according to the image information M2 to generate image light S2. Therefore, the light modulator 31 shown in FIG16 cannot emit light by itself, and the light modulator 31 is specifically a transmissive light modulator, which includes a transmissive liquid crystal display (LCD). The light modulator 31 includes a liquid crystal layer. At a first moment, the light modulator 31 controls the deflection of liquid crystal molecules in the liquid crystal layer according to the image information M1 to achieve modulation of the light beam transmitted from the light source 33 to the light modulator 31, thereby generating image light S1, wherein the image light S1 includes the image information M1; at a second moment, the light modulator 31 controls the deflection of liquid crystal molecules in the liquid crystal layer according to the image information M2 to achieve modulation of the light beam transmitted from the light source 33 to the light modulator 31, thereby generating image light S2, wherein the image light S2 includes the image information M2.

Exemplarily, as shown in Figure 16, the image generating unit 30 also includes a lighting element 34, wherein the lighting element 34 is located between the light source 33 and the light modulator 31 on the transmission light path of the light beam generated by the light source 33, and the lighting element 34 includes one or more lenses, and the lighting element 34 is used to shape the light beam emitted by the light source 33 and transmit the shaped light beam to the light modulator 31.

Exemplarily, referring to FIG17 , compared with the image generating unit 30 shown in FIG16 , the image generating unit 30 shown in FIG17 further includes a reflective element R1. When the image generating unit 30 includes an illumination element 34, the reflective element R1 is located between the illumination element 34 and the optical modulator 31 on the transmission optical path of the light beam generated by the light source 33, and the reflective element R1 is used to receive the light beam emitted by the illumination element 34 and reflect the light beam to the optical modulator 31; when the image generating unit 30 does not include an illumination element 34, the reflective element R1 is located between the illumination element 34 and the optical modulator 31 on the transmission optical path of the light beam generated by the light source 33, and the reflective element R1 is used to receive the light beam emitted by the light source 33 and reflect the light beam to the optical modulator 31. Among them, the light modulator 31 shown in Figure 17 is specifically a reflective light modulator, and the light modulator 31 includes a digital micro-mirror device (DMD), liquid crystal on silicon (LCOS), and micro electro mechanical systems (MEMS).

Exemplarily, as shown in FIG. 18 , compared with the image generating unit 30 shown in FIG. 17 , the image generating unit shown in FIG. 18 further includes a display screen 35, wherein the display screen 35 is specifically a transmissive display screen, and at a first moment, the lens 32 is specifically used to transmit the image light S1 to the display screen 35, and the display area 350 of the display screen 35 is used to receive the image light S1, and display the image light S1 according to a first predetermined angle distribution, and the display screen 35 is also used to transmit the image light S1 to the optical device 41 in the optical imaging unit 40 shown in FIG. 14 ; at a second moment, the lens 32 is also specifically used to transmit the image light S2 to the display screen 35, and the display screen 35 is used to receive the image light S2, and display the image light S2 according to a second predetermined angle distribution, and the display screen 35 is also used to transmit the image light S2 to the optical device 41 in the optical imaging unit 40 shown in FIG. 14 .

Exemplarily, as shown in Figure 18, compared with the image generating unit 30 shown in Figure 17, the image generating unit shown in Figure 18 also includes a reflective element R2, wherein the display screen 35 is specifically a reflective display screen, and at a first moment, the lens 32 is specifically used to transmit the image light S1 to the reflective element R2, and the reflective element R2 is used to receive the image light S1 and reflect the image light S1 to the display screen 35; at a second moment, the lens 32 is also specifically used to transmit the image light S2 to the reflective element R2, and the reflective element R2 is also used to receive the image light S2 emitted by the lens 32 and reflect the image light S2 to the display screen 35.

Exemplarily, the light modulator 31 shown in Figure 18 or Figure 19 is specifically a reflective light modulator. In other embodiments, the light modulator shown in Figure 18 or Figure 19 may also be a transmissive light modulator as shown in Figure 16, and the embodiments of the present application are not limited to this.

Exemplarily, in the image generation unit 30 shown in any one of Figures 15 to 19, the image information M1 received by the light modulator 31 may be instrument information, then the image light S1 includes the instrument information, and the image information M2 received by the light modulator 31 may be navigation information, then the image light S2 includes the navigation information; or, the image information M1 received by the light modulator 31 may be navigation information, then the image light S1 includes the navigation information, and the image information M2 received by the light modulator 31 may be instrument information, then the image light S2 includes the instrument information. The embodiments of the present application do not limit the image information. When the display device 20 shown in Figure 2 is a display device in an optical desktop display, the image information M1 and image information M2 received by the light modulator 31 may also be any two different display information.

At the first moment, the image light S1 generated by the image generation unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 first receives the image light S1. The optical device 41 includes one or more of the following: a lens, a curved reflector.

Exemplarily, the optical device 41 is used to receive image light S1, configure an optical focal value D1 for the image light S1, and generate image light S3. Referring to FIG8 , when the optical device 41 includes a lens, the optical focal value of the lens may be D1. The lens may be one or more. When there is one lens, the optical focal value of the lens is D1. When there are more than one lenses, the optical focal value of the multiple lenses combined is D1. Referring to FIG9 , when the optical device 41 includes a curved reflector, the optical focal value of the curved reflector may be D1. The curved reflector may be one or more. When there is one curved reflector, the optical focal value of the curved reflector is D1. When there are more than one curved reflector, the optical focal value of the multiple curved reflectors combined is D1. Exemplarily, the optical device 41 may also be a combination of a lens and a curved reflector, and the optical focal length value of the combination of the lens and the curved reflector is D1. In this case, the curved reflector may first receive the image light S1 and reflect the image light S1 to the lens; or the lens may first receive the image light S1 and transmit the image light S1 to the curved reflector.

The optical imaging unit 40 further includes an optical waveguide 43 . The optical device 41 generates image light S3 , and the optical device 41 couples the image light S3 from a coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43 . The optical waveguide 43 is used to couple the image light S3 out from a coupling-out region 432 of the optical waveguide 43 .

At the second moment, the image light S2 generated by the image generation unit 30 is transmitted to the optical imaging unit 40. The optical device 41 in the optical imaging unit 40 first receives the image light S2. The optical device 41 includes one or more of the following: a lens, a curved reflector.

Exemplarily, the optical device 41 is used to receive the image light S2, configure the optical focal value D2 for the image light S2, and generate the image light S4. Referring to FIG8 , when the optical device 41 includes a lens, the optical focal value of the lens may be D2. The lens may be one or more. When there is one lens, the optical focal value of the lens is D2. When there are more than one lenses, the optical focal value of the multiple lenses combined is D2. Referring to FIG9 , when the optical device 41 includes a curved reflector, the optical focal value of the curved reflector may be D1. The curved reflector may be one or more. When there is one curved reflector, the optical focal value of the curved reflector is D2. When there are more than one curved reflector, the optical focal value of the multiple curved reflectors combined is D2. Exemplarily, the optical device 41 may be a combination of a lens and a curved reflector, and the optical focal length of the combination of the lens and the curved reflector is D2. In this case, the curved reflector may first receive the image light S2 and reflect the image light S2 to the lens; or the lens may first receive the image light S2 and transmit the image light S2 to the curved reflector.

The optical imaging unit 40 further includes an optical waveguide 43 . The optical device 42 generates image light S4 , and the optical device 42 couples the image light S4 from a coupling-in region 431 of the optical waveguide 43 into the optical waveguide 43 . The optical waveguide 43 is used to couple the image light S4 out from a coupling-out region 432 of the optical waveguide 43 .

Specifically, the optical device 41 shown in FIG. 14 can configure different optical focal length values for different image lights at different times.

The optical waveguide 43 shown in Figure 14 includes the geometric optical waveguide shown in Figure 10, the diffraction optical waveguide shown in Figure 11 and the holographic optical waveguide shown in Figure 12. The geometric optical waveguide can be a one-dimensional geometric optical waveguide or a two-dimensional geometric optical waveguide, the diffraction optical waveguide can be a one-dimensional diffraction optical waveguide or a two-dimensional diffraction optical waveguide, and the holographic optical waveguide can be a one-dimensional holographic optical waveguide or a two-dimensional holographic optical waveguide, and the embodiments of the present application do not limit this.

Exemplarily, referring to FIG. 20, FIG. 20 is a circuit diagram of a display device 20 provided in an embodiment of the present application. As shown in FIG. 20, the circuit in the display device 20 mainly includes a processor 1001, an internal memory 1002, an external memory interface 1003, an audio module 1004, a video module 1005, a power module 1006, a wireless communication module 1007, an I/O interface 1008, a video interface 1009, a controller area network (Controller Area Network, CAN) transceiver 1010, a display circuit 1028 and an imaging device 1029, etc. Among them, the processor 1001 and its peripheral components, such as the internal memory 1002, the CAN transceiver 1010, the audio module 1004, the video module 1005, the power module 1006, the wireless communication module 1007, the I/O interface 1008, the video interface 1009, the CAN transceiver 1010, and the display circuit 1028 can be connected through a bus. Processor 1001 may be referred to as a front-end processor.

In addition, the circuit diagrams shown in the embodiments of the present application do not constitute a specific limitation on the display device. In other embodiments of the present application, the display device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

The processor 1001 includes one or more processing units, for example, the processor 1001 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural network processor (NPU), etc. Different processing units may be independent devices or integrated in one or more processors.

A memory may also be provided in the processor 1001 for storing instructions and data. For example, the operating system of the display device, the AR Creator software package, etc. may be stored. In some embodiments, the memory in the processor 1001 is a cache memory. The memory may store instructions or data that the processor 1001 has just used or circulated. If the processor 1001 needs to use the instruction or data again, it may be directly called from the memory. Repeated access is avoided, the waiting time of the processor 1001 is reduced, and the efficiency of the system is improved.

In addition, if the display device in this embodiment is installed on a vehicle, the functions of the processor 1001 can be implemented by a domain controller on the vehicle.

In some embodiments, the display device may further include a plurality of input/output (I/O) interfaces 1008 connected to the processor 1001. The interface 1008 may include, but is not limited to, an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (SIM) interface, and/or a universal serial bus (USB) interface, etc. The above-mentioned I/O interface 1008 can be connected to devices such as a mouse, touch screen, keyboard, camera, speaker/loudspeaker, microphone, etc., and can also be connected to physical buttons on the display device (such as volume buttons, brightness adjustment buttons, power buttons, etc.).

The internal memory 1002 can be used to store computer executable program codes, which include instructions. The memory 1002 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting function, an AR function, etc.), etc. The data storage area may store data created during the use of the display device (such as a phone book, world time, etc.), etc. In addition, the internal memory 1002 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (Universal Flash Storage, UFS), etc. The processor 1001 executes various functional applications and data processing of the display device by running instructions stored in the internal memory 1002 and/or instructions stored in a memory provided in the processor 1001.

The external memory interface 1003 can be used to connect an external memory (such as a Micro SD card). The external memory can store data or program instructions as needed, and the processor 1001 can perform operations such as reading and writing these data or programs through the external memory interface 1003.

The audio module 1004 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal. The audio module 1004 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 1004 can be arranged in the processor 1001, or some functional modules of the audio module 1004 can be arranged in the processor 1001. The display device can realize audio functions through the audio module 1004 and the application processor.

The video interface 1009 can receive external audio and video input, which can be a high-definition multimedia interface (HDMI), a digital video interface (DVI), a video graphics array (VGA), a display port (DP), a low voltage differential signaling (LVDS) interface, etc. The video interface 1009 can also output video to the outside. For example, the display device receives video data sent by the navigation system or receives video data sent by the domain controller through the video interface.

The video module 1005 can decode the video input by the video interface 1009, for example, by performing H.264 decoding. The video module can also encode the video collected by the display device, for example, by performing H.264 encoding on the video collected by the external camera. In addition, the processor 1001 can also decode the video input by the video interface 1009, and then output the decoded image signal to the display circuit.

Furthermore, the display device further includes a CAN transceiver 1010, which can be connected to the CAN bus (CAN BUS) of the car. Through the CAN bus, the display device can communicate with the in-vehicle entertainment system (music, radio, video module), the vehicle status system, etc. For example, the user can turn on the in-vehicle music playback function by operating the display device. The vehicle status system can send vehicle status information (doors, seat belts, etc.) to the display device for display.

The display circuit 1028 and the imaging device 1029 jointly realize the function of displaying an image. The display circuit 1028 receives the image information output by the processor 1001, processes the image information, and then inputs it into the imaging device 1029 for imaging. The display circuit 1028 can also control the image displayed by the imaging device 1029. For example, it controls display parameters such as brightness or contrast. The display circuit 1028 may include a drive circuit, an imaging device, and a display device. Control circuit, etc.

The imaging device 1029 is used to modulate the light beam input by the light source according to the input image information, so as to generate a visible image. The imaging device 1029 can be a liquid crystal on silicon panel, a liquid crystal display panel or a digital micromirror device.

In this embodiment, the video interface 1009 can receive input video data (or called a video source), and the video module 1005 outputs an image signal to the display circuit 1028 after decoding and/or digital processing. The display circuit 1028 drives the imaging device 1011 to image the light beam emitted by the light source according to the input image signal, thereby generating a visible image (emitting imaging light).

The power module 1006 is used to provide power to the processor 1001 and the light source according to the input power (e.g., direct current), and the power module 1006 may include a rechargeable battery, which can provide power to the processor 1001 and the light source. The light emitted by the light source can be transmitted to the imaging device 1029 for imaging, thereby forming an image light signal (imaging light).

In addition, the power module 1006 can be connected to a power supply module (such as a power battery) of a car, and the power supply module 1006 of the display device is powered by the power supply module of the car.

The wireless communication module 1007 enables the display device to communicate wirelessly with the outside world, and can provide wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) and other wireless communication solutions. The wireless communication module 1007 can be one or more devices integrating at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 1001. The wireless communication module 1007 can also receive the signal to be sent from the processor 1001, modulate the frequency, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

In addition, in addition to being input through the video interface 1009, the video data decoded by the video module 1005 can also be wirelessly received through the wireless communication module 1007 or read from the internal memory 1002 or the external memory. For example, the display device can receive video data from the terminal device or the in-vehicle entertainment system through the wireless local area network in the vehicle, and the display device can also read the audio and video data stored in the internal memory 1002 or the external memory.

As shown in Figure 21, when the display device 20 is installed on a vehicle 200, the vehicle 200 also includes a windshield 16, which is used to receive the image light S3 and the image light S4 emitted by the display device 20. The windshield 16 reflects the image light S3 to the eyes 17 of the driver of the vehicle, so that the driver of the vehicle 200 sees the image F3 formed by the image light S3, and the image F3 is specifically a virtual image; the windshield 16 reflects the image light S4 to the eyes 17 of the driver of the vehicle, so that the driver of the vehicle 200 sees the image F4 formed by the image light S4, and the image F3 is specifically a virtual image, wherein the projection distance of the image F3 is different from the projection distance of the image F4.

Please refer to Figure 22, which is a functional schematic diagram of a vehicle 200 provided in an embodiment of the present application. The vehicle may include various subsystems, such as the sensor system 210, the control system 220, one or more peripheral devices 230 (the figure shows one as an example), the power supply 240, the computer system 250 and the display system 260 shown in the figure, and the above-mentioned subsystems can communicate with each other. The display system 260 may include a display device provided in an embodiment of the present application. The vehicle may also include other functional systems, such as an engine system that provides power for the vehicle, a cockpit, etc., which are not limited here by the present application.

Among them, the sensor system 210 may include detection devices that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules. As shown in Figure 22, these detection devices may include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser rangefinder, a camera device, a wheel speed sensor, a steering sensor, a gear position sensor, or other components for automatic detection, etc., and this application does not limit them.

The control system 220 may include several components, such as the steering unit, brake unit, lighting system, automatic driving system, map navigation system, network timing system and obstacle avoidance system shown in the figure. The control system 220 may receive information (such as vehicle speed, vehicle distance, etc.) sent by the sensor system 210 to realize functions such as automatic driving and map navigation.

Optionally, the control system 220 may also include components such as a throttle controller and an engine controller for controlling the vehicle's speed, which is not limited in this application.

The peripheral device 230 may include several components, such as a communication system, a touch screen, a user interface, a microphone, and a speaker. The communication system is used to realize network communication between the vehicle and other devices other than the vehicle. In practical applications, the communication system may use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or optical fiber.

Power source 240 represents a system that provides power or energy to the vehicle, which may include but is not limited to rechargeable lithium batteries or lead-acid batteries, etc. In practical applications, one or more battery components in the power source are used to provide electrical energy or energy for starting the vehicle. The type and material of the power source are not limited in this application.

Several functions of the vehicle can be controlled and implemented by the computer system 250. The computer system 250 may include one or more processors 2501 (one processor is shown as an example in the figure) and a memory 2502 (also referred to as a storage device). In actual applications, the memory 2502 is also inside the computer system 250, or it can be outside the computer system 250, for example, as a cache in the vehicle, etc., which is not limited in this application.

The processor 2501 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2501 may be used to run the relevant programs or instructions corresponding to the programs stored in the memory 2502 to implement the corresponding functions of the vehicle. The processor 2501 may also be called a domain controller.

The memory 2502 may include a volatile memory, such as a RAM; the memory may also include a non-volatile memory, such as a ROM, a flash memory, a HDD, or a solid-state drive SSD; the memory 2502 may also include a combination of the above-mentioned types of memory. The memory 2502 may be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2501 can call the program codes or instructions stored in the memory 2502 to implement the corresponding functions of the vehicle. In the present application, a set of program codes for vehicle control may be stored in the memory 2502, and the processor 2501 may call the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is specifically described in detail below in this application.

Optionally, in addition to storing program codes or instructions, the memory 2502 may also store information such as road maps, driving routes, sensor data, etc. The computer system 250 may be combined with other elements in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc., to implement relevant functions of the vehicle. For example, the computer system 250 may control the driving direction or driving speed of the vehicle based on the data input from the sensor system 210, which is not limited in this application.

The display system 260 can interact with other systems in the vehicle, for example, it can display navigation information sent by the control system 220, or play multimedia content sent by the computer system 250 and the peripheral device 230. The specific structure of the display system 260 refers to the embodiment of the above-mentioned display device, which will not be described again here.

Among them, the four subsystems illustrated in the present embodiment, sensor system 210, control system 220, computer system 250 and display system 260 are only examples and do not constitute limitations. In practical applications, vehicles can combine several components in the vehicle according to different functions to obtain subsystems with corresponding different functions. In practical applications, vehicles can include more or fewer subsystems or components, which is not limited in this application.

The means of transportation in the embodiments of the present application may be known means of transportation such as cars, airplanes, ships, rockets, etc., or may be new means of transportation that will appear in the future. The car may be an electric car, a fuel car, or a hybrid car, for example, a pure electric car, an extended-range electric car, a hybrid electric car, a fuel cell car, a new energy car, etc., and the present application does not make specific limitations on this.

In a possible application scenario, the display device 20 in the present application is integrated into a near eye display (NED) device. The NED device may be, for example, an augmented reality (AR) device or a virtual reality (VR) device. The AR device may include, but is not limited to, AR glasses or AR helmets, and the VR device may include, but is not limited to, VR glasses or VR helmets. Taking AR glasses as an example, users can wear AR glasses to play games, watch videos, participate in virtual meetings, or do video shopping.

In another possible application scenario, the display device 20 in the present application is integrated into a projector, and the projector can project images onto a wall or a projection screen.

In another possible implementation, the display device 20 in the present application is integrated into a vehicle-mounted display screen, and the vehicle-mounted display screen can be installed on the back of a seat or a co-pilot seat of a vehicle, etc. The present application does not limit the installation location of the vehicle-mounted display screen.

Among them, the application scenarios given above are only examples. The display device provided in this application can also be applied to other possible scenarios, such as medical equipment, and this application does not limit it.

Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (16)

A display device, characterized by comprising: an image generating unit and an optical imaging unit; The optical imaging unit includes a first optical device, a second optical device and an optical waveguide; The image generating unit is used to generate a first image light and a second image light; The first optical device is used to receive the first image light, configure a first optical power value for the first image light, generate a third image light, and couple the third image light into the optical waveguide from the coupling-in region of the optical waveguide; The second optical device is used to receive the second image light, configure a second optical power value for the second image light, generate a fourth image light, and couple the fourth image light into the optical waveguide from the coupling-in region of the optical waveguide, wherein the first optical power value is different from the second optical power value; The optical waveguide is used to couple the third image light out from the outcoupling region of the optical waveguide; The optical waveguide is further used to couple the fourth image light out from the outcoupling region of the optical waveguide. The display device according to claim 1, characterized in that The image generation unit includes a light modulator and a lens; the light modulator includes a first modulation area and a second modulation area; The first modulation region is used to generate the first image light according to the first image information; The second modulation region is used to generate the second image light according to the second image information; The lens is used to receive the first image light generated by the first modulation area and transmit the first image light to the first optical device; The lens is further used to receive the second image light generated by the second modulation area, and transmit the second image light to the second optical device. The display device according to claim 2, characterized in that The image generation unit further includes a light source; The light source is used to generate a light beam and transmit the light beam to the light modulator; The first modulation area is specifically used to modulate the light beam according to the first image information to generate the first image light; The second modulation area is specifically used to modulate the light beam according to the second image information to generate the second image light. The display device according to claim 2 or 3, characterized in that The image generation unit further includes a display screen; the display screen includes a first display area and a second display area; The lens is specifically used to transmit the first image light to the first display area of the display screen; The first display area is used to display the first image light according to a first predetermined angle distribution; The first display area is further used to transmit the first image light to the first optical device; The lens is further specifically used to transmit the second image light to the second display area of the display screen; The second display area is used to display the second image light according to a second predetermined angle distribution; The second display area is further used to transmit the second image light to the second optical device. A display device, characterized by comprising: an image generating unit and an optical imaging unit; The optical imaging unit includes an optical device, a predetermined reflective element and an optical waveguide; The image generating unit is used to generate a first image light and a second image light; The predetermined reflective element is used to receive the first image light and reflect the first image light to the optical device; The optical device is used to configure an optical power value for the first image light, generate a third image light, and couple the third image light into the optical waveguide from the coupling-in region of the optical waveguide; The optical device is further used to receive the second image light, configure the optical power value for the second image light, generate the fourth image light, and couple the fourth image light into the optical waveguide from the coupling-in region of the optical waveguide; The optical waveguide is used to couple the third image light out from the outcoupling region of the optical waveguide; The optical waveguide is further used to couple the fourth image light out from the outcoupling region of the optical waveguide. The display device according to claim 5, characterized in that The image generation unit includes a light modulator and a lens; the light modulator includes a first modulation area and a second modulation area; The first modulation region is used to generate the first image light according to the first image information; The second modulation region is used to generate the second image light according to the second image information; The lens is used to receive the first image light generated by the first modulation area and transmit the first image light to the predetermined Reflective element; The lens is further used to receive the second image light generated by the second modulation area and transmit the second image light to the optical device. The display device according to claim 6, characterized in that The image generation unit further includes a light source; The light source is used to generate a light beam and transmit the light beam to the light modulator; The first modulation area is specifically used to modulate the light beam according to the first image information to generate the first image light; The second modulation area is specifically used to modulate the light beam according to the second image information to generate the second image light. The display device according to claim 6 or 7, characterized in that The image generation unit further includes a display screen; the display screen includes a first display area and a second display area; The lens is specifically used to transmit the first image light to the first display area of the display screen; The first display area is used to display the first image light according to a first predetermined angle distribution; The first display area is further used to transmit the first image light to the predetermined reflective element; The lens is further specifically used to transmit the second image light to the second display area of the display screen; The second display area is used to display the second image light according to a second predetermined angle distribution; The second display area is further used to transmit the second image light to the optical device. A vehicle, characterized in that it comprises a display device as described in any one of claims 1 to 8, wherein the display device is installed on the vehicle. The vehicle according to claim 9, further comprising a windshield, The windshield is configured to receive the third image light emitted by the display device and reflect the third image light to the eyes of a driver of a vehicle; The windshield is further configured to receive the fourth image light emitted by the display device, and reflect the fourth image light to the eyes of the driver of the vehicle. A display device, characterized in that it comprises: an image generating unit and an optical imaging unit; the optical imaging unit comprises an optical device and an optical waveguide; The image generating unit is used to generate a first image light; The optical device is used to receive the first image light, configure the optical power value for the first image light, generate the second image light, and couple the second image light into the optical waveguide from the coupling-in region of the optical waveguide; The optical waveguide is used to couple the second image light out from the outcoupling region of the optical waveguide. The display device according to claim 11, characterized in that The image generating unit comprises a light modulator and a lens; The light modulator is used to generate a first image light according to the image information; The lens is used to receive the first image light generated by the light modulator and transmit the first image light to the optical device. The display device according to claim 12, characterized in that The image generation unit further includes a light source; The light source is used to generate a light beam and transmit the light beam to the light modulator; The light modulator is specifically configured to modulate the light beam according to the image information to generate the first image light. The display device according to claim 12 or 13, characterized in that The image generation unit also includes a display screen; The lens is specifically used to transmit the first image light to the display screen; The display screen is used to display the first image light according to a predetermined angle distribution; The display screen is further used to transmit the first image light to the optical device. A vehicle, characterized in that it comprises a display device as described in any one of claims 11 to 14, wherein the display device is installed on the vehicle. The vehicle according to claim 15, further comprising a windshield, The windshield is used to receive the second image light emitted by the display device and reflect the second image light to the eyes of the driver of the vehicle.