CN117784311A - Optical waveguide devices and near-eye display devices - Google Patents
Optical waveguide devices and near-eye display devices Download PDFInfo
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- CN117784311A CN117784311A CN202311852126.7A CN202311852126A CN117784311A CN 117784311 A CN117784311 A CN 117784311A CN 202311852126 A CN202311852126 A CN 202311852126A CN 117784311 A CN117784311 A CN 117784311A
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Abstract
The application provides an optical waveguide device and near-to-eye display equipment, which belong to the technical field of optical display, and the method comprises the following steps: a waveguide layer comprising an in-coupling region and an out-coupling region; a first polarizing reflection layer and a second polarizing reflection layer which are provided on both surfaces of the waveguide layer and do not cover the coupling-in region and the coupling-out region; incident light having a polarization state is coupled into the waveguide layer from the coupling-in region, and the incident light propagating in the waveguide layer is coupled out from the coupling-out region by reflection of the first and/or second polarization-reflecting layers. The optical waveguide device increases the angle of view of the near-eye display device and improves the brightness of the virtual image, and the use experience of a user is greatly improved.
Description
Technical Field
The present application relates to the field of optical display technologies, and in particular, to an optical waveguide device and a near-to-eye display apparatus.
Background
The optical module of an augmented reality (Augmented Reality, AR) near-eye display device is typically composed of two parts, an optical machine (or light engine) and a light combiner, the optical machine is composed of an image source and a projection lens, the image source is used for generating an image to be displayed, and the projection lens projects the image displayed by the image source to infinity or a specified distance. The optical combiner can directionally transmit the signal light emitted by the optical machine to the human eye to form an image to be displayed on the retina, and the optical combiner can also be called an optical waveguide device. The optical combiner has good permeability to the environment light of the real world, and through the optical combiner, the human eye can simultaneously see the scenery of the real world and the image projected by the optical machine, and the optical waveguide has the advantages of thin thickness, light weight and good light transmittance, namely the optical combiner is not two choices.
At present, the optical waveguide type near-eye display device is limited by optical mechanical power and coupling efficiency of a waveguide lens in the use process, so that virtual image brightness is low, virtual image blurring is caused, the refractive index of the waveguide lens is limited, the angle of view of the near-eye display device is limited, and the user experience is poor when using the near-eye display device.
Disclosure of Invention
The main object of the present application is to provide an optical waveguide device and a near-eye display apparatus, which aim to increase the angle of view of the near-eye display apparatus and to improve the brightness of a virtual image.
In a first aspect, the present application provides an optical waveguide device comprising:
a waveguide layer comprising an in-coupling region and an out-coupling region;
a first polarizing reflection layer and a second polarizing reflection layer which are provided on both surfaces of the waveguide layer and do not cover the coupling-in region and the coupling-out region;
incident light having a polarization state is coupled into the waveguide layer from the coupling-in region, and the incident light propagating in the waveguide layer is coupled out from the coupling-out region by reflection of the first and/or second polarization reflection layers.
In an embodiment, the optical waveguide device further includes a polarizing component, where the polarizing component is disposed opposite to the coupling-in region of the waveguide layer, and the polarizing component is configured to adjust a polarization state of incident light.
In an embodiment, the in-coupling region and the out-coupling region are located on the first surface or the second surface of the waveguide layer; the second polarization reflection layer is arranged on the second surface of the waveguide layer.
In an embodiment, the optical waveguide device further comprises a protective cover plate, the protective cover plate is disposed near the first surface of the waveguide layer, and the protective cover plate is used for protecting the coupling-in region and the coupling-out region located on the first surface of the waveguide layer.
In an embodiment, the protective cover plate is connected with the first surface of the waveguide layer through an adhesive, wherein the protective cover plate is spaced from the waveguide layer.
In an embodiment, the protective cover plate is connected to the first surface of the waveguide layer through an adhesive, wherein the adhesive fills up a gap between the protective cover plate and the first surface.
In one embodiment, the first and second polarizing reflective layers comprise polarizing reflective films; the polarizing assembly includes a polarization controller or a polarizer.
In an embodiment, the coupling-in region comprises a surface relief grating, a volume hologram grating, a liquid crystal device, or a supersurface; the out-coupling region comprises a surface relief grating, a volume holographic grating, a liquid crystal device or a super surface.
In an embodiment, the waveguide layer further comprises a relay zone, the relay zone being arranged between the coupling-in zone and the coupling-out zone; the relay region is used for changing the transmission path of light so that the light can spread over the coupling-out region.
In one embodiment, the optical waveguide device includes the waveguide layer, the first polarization reflecting layer, and the second polarization reflecting layer to form an optical waveguide assembly;
the optical waveguide device comprises a plurality of optical waveguide assemblies, and the optical waveguide assemblies are overlapped.
In an embodiment, the coupling-in region and the coupling-out region of the waveguide layer in each of the optical waveguide assemblies are used for coupling in and coupling out light of a corresponding wavelength band, respectively.
In an embodiment, the optical waveguide device comprises three optical waveguide assemblies, and the coupling-in region and the coupling-out region of the waveguide layer in the three optical waveguide assemblies are used for coupling in and coupling out light in red light, green light and blue light bands respectively.
In a second aspect, the present application further provides a near-eye display device, where the near-eye display device includes the optical waveguide device in the embodiment of the present invention.
The application provides an optical waveguide device and a near-eye display device, wherein the optical waveguide device comprises a waveguide layer, and the waveguide layer comprises a coupling-in region and a coupling-out region; a first polarization reflection layer and a second polarization reflection layer which are disposed on both surfaces of the waveguide layer and do not cover the coupling-in region and the coupling-out region; incident light having a polarization state is coupled from the coupling-in region into the waveguide layer, and incident light propagating in the waveguide layer is coupled out from the coupling-out region by reflection of the first and/or second polarization reflecting layers. According to the invention, the incident light with the polarization state is diffracted to the waveguide layer through the coupling-in region, the diffraction efficiency of the coupling-in region can be improved by the incident light with the polarization state, the light which does not meet the total internal reflection condition can be reflected by the first polarization reflection layer and the second polarization reflection layer, so that the incident light with a larger angle is transmitted in the waveguide layer, the light emitting region of the coupling-out region is larger, the field angle of the near-eye display device is greatly increased, the first polarization reflection layer and the second polarization reflection layer can reflect the external strong light back, the light quantity of the external strong light entering the inner side of the near-eye display device is weakened, the interference of the external strong light on the virtual image is reduced, and the brightness of the virtual image is further improved, thereby increasing the field angle of the near-eye display device, improving the brightness of the virtual image and greatly improving the use experience of a user.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of an optical waveguide device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another structure of an optical waveguide device according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another optical waveguide device according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another optical waveguide device according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another optical waveguide device according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another structure of an optical waveguide device according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another structure of an optical waveguide device according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another optical waveguide device according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of another structure of an optical waveguide device according to an embodiment of the present disclosure;
FIG. 10 is a schematic view of another structure of an optical waveguide device according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a near-eye display device according to an embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical waveguide device according to an embodiment of the present application.
As shown in fig. 1, the optical waveguide device comprises a waveguide layer 11, a first polarizing reflective layer 12 and a second polarizing reflective layer 13, the waveguide layer 11 comprising an in-coupling region 111 and an out-coupling region 112; the first and second polarizing reflection layers 12 and 13 are disposed on both surfaces of the waveguide layer 11, and do not cover the coupling-in region 111 and the coupling-out region 112.
Incident light having a polarization state on the light side is coupled into the waveguide layer 11 from the coupling-in region 111, the incident light propagating in the waveguide layer 11 is reflected by the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, coupled out from the coupling-out region 112, and the coupled-out outgoing light is transmitted into the user's eye 100. The coupling-in region 111 diffracts the incident light having the polarization state into the waveguide layer 11, and the incident light having the polarization state can improve the diffraction efficiency of the coupling-in region; the first polarizing reflective layer 12 and the second polarizing reflective layer 13 can reflect light that does not meet the total internal reflection condition, so that incident light with a larger angle is transmitted in the waveguide layer, and thus the light area of the outgoing light coupled out by the coupling-out region 112 is larger, which greatly increases the viewing angle of the near-eye display device.
In an embodiment, as shown in fig. 1, the second polarizing reflection layer 13 and the first polarizing reflection layer 12 have a polarization selective reflection function, so that external strong light with the same polarization state as that of the polarizing reflection layer can be reflected back, and the luminous flux of the external strong light entering the inner side of the near-eye display device is reduced, so that the interference of the external strong light on the virtual image is reduced, and the contrast ratio of the virtual image is further improved.
In an embodiment, as shown in fig. 2, the optical waveguide device further includes a polarization component 21, where the polarization component 21 is disposed opposite to the coupling-in region 111 of the waveguide layer, and the polarization component 21 is configured to adjust a polarization state of incident light and inject the incident light generated after the polarization state is adjusted into the coupling-in region 111. The polarization state of the incident light beam is adjusted by the polarization component so that it can be reflected by the first and second polarization reflecting layers and transmitted in the waveguide.
The polarization direction of the incident light is the same as the polarization directions of the first and second polarization reflection layers 12 and 13, so that the incident light can be reflected when transmitted to the first and/or second polarization reflection layers 12 and 13.
The distance between the polarizing element 21 and the coupling-in area 11 may be set according to practical situations, which is not limited in the embodiment of the present invention, for example, the polarizing element 21 and the coupling-in area 11 are set at a predetermined distance, or the polarizing element 21 and the coupling-in area 11 are closely adhered to each other.
Illustratively, the polarization component 21 adjusts the polarization state of the incident light to obtain the incident light with the preset polarization state, the incident light with the preset polarization state is coupled into the waveguide layer 11 from the coupling-in region 111, the incident light propagating in the waveguide layer 11 is reflected by the first polarizing reflective layer 12 and the second polarizing reflective layer 13, and the incident light is coupled out from the coupling-out region 112 to obtain the emergent light. The polarization component 21 converts the incident light into the incident light with the preset polarization state, and diffracts the incident light to the waveguide layer 11 through the coupling-in region 111, so that the incident light with the preset polarization state can improve the diffraction efficiency of the coupling-in region; the first polarizing reflective layer 12 and the second polarizing reflective layer 13 can reflect light that does not meet the total internal reflection condition, so that incident light with a larger angle is transmitted in the waveguide layer, and thus the light area of the outgoing light coupled out by the coupling-out region 112 is larger, which greatly increases the viewing angle of the near-eye display device. The type of the preset polarization state may be set according to practical situations, which is not specifically limited in the embodiment of the present invention.
In one embodiment, as shown in fig. 2, the coupling-in region 111 and the coupling-out region 112 are located on the first surface 11a of the waveguide layer 11, the first polarization-reflecting layer 12 is disposed on the first surface of the waveguide layer 11 and does not cover the coupling-in region 111 and the coupling-out region 112, and the second polarization-reflecting layer 13 is disposed on the second surface 11b of the waveguide layer 11. The incident light is diffracted to the waveguide layer 11 through the coupling-in region 111, propagates in the waveguide layer 11, is reflected by the first polarizing reflection layer 12 and/or the second polarizing reflection layer 13, and is coupled out from the coupling-out region 112 to obtain emergent light; the first polarizing reflective layer 12 and the second polarizing reflective layer 13 can reflect light that does not meet the total internal reflection condition, so that incident light with a larger angle is transmitted in the waveguide layer, and thus the area of emergent light coupled out by the coupling-out region 112 is larger, which greatly increases the viewing angle of the near-eye display device.
It should be noted that the coupling-in region 111 and the coupling-out region 112 may also be disposed on a side of the first polarization reflective layer 12 away from the optical waveguide 11, as shown in fig. 3, where the coupling-in region 111 and the coupling-out region 112 are disposed on a side of the first polarization reflective layer 12 away from the optical waveguide 11, and the coupling-in region 111 couples the incident light into the optical waveguide 11, and the coupling-out region 112 couples the emergent light out. In some cases, the in-coupling region 111 and the out-coupling region 112 are disposed on a side of the second polarizing reflective layer 13 remote from the optical waveguide 11.
It should be noted that, depending on whether the coupling-in region and the coupling-out region are transmissive or reflective, the coupling-in region 111 and the coupling-out region 112 may be located on different surfaces of the waveguide layer 11, for example, the transmissive coupling-in region 111 is located on the first surface 11a of the waveguide layer 11, the reflective coupling-out region 112 is located on the second surface 11b of the waveguide layer 11, for example, the reflective coupling-in region 111 is located on the second surface 11b of the waveguide layer 11, and the reflective coupling-out region is located on the second surface 11b of the waveguide layer 11.
Illustratively, as shown in fig. 4, in the case where the coupling-in region and the coupling-out region are in the reflective mode of operation, the coupling-in region 111 is located on the first surface 11b of the waveguide layer 11, and the coupling-out region 112 is located on the second surface 11b of the waveguide layer 11. Other configuration of the in-coupling region and the out-coupling region may be configured based on the above embodiments and fig. 2 and 3, which are not repeated in the embodiments of the present invention.
In an embodiment, the first and second polarizing reflection layers 12 and 13 may be polarizing reflection films. The polarizing assembly 21 includes a polarization controller or a polarizer. Wherein the linear polarized light generated by the polarization controller or the polarizer has the same polarization direction as the polarization reflective film.
For example, the incident light is subjected to light intensity and polarization direction conversion by the polarization controller to generate incident light with a preset polarization state, the incident light is coupled into the waveguide layer 11 by the coupling-in region 111, the incident light with the same polarization direction as the polarization reflection film is reflected by the first polarization reflection film and/or the second polarization reflection film, and is coupled out by the coupling-out region 112, so that a virtual image with a larger field angle is obtained at the human eye.
Specifically, by providing the first polarizing reflective layer on the first surface of the waveguide layer and providing the second polarizing reflective layer on the second surface of the waveguide layer, light that does not satisfy the total internal reflection condition is realized, and total internal reflection can also occur on the first polarizing reflective layer and/or the second polarizing reflective layer, so that incident light with a larger angle is transmitted in the waveguide layer, and the angle of view of the outgoing light is further made larger.
In one embodiment, the incoupling region 111 comprises a surface relief grating, a volume hologram grating, a super surface, a liquid crystal device; the outcoupling region 112 comprises a surface relief grating, a volume hologram grating, a super surface, a liquid crystal device. Parameters of the surface relief grating, the volume hologram grating, the super surface and the liquid crystal device can be set according to actual conditions, and the embodiment of the invention is not particularly limited. By optimizing parameters of the surface relief grating, the volume holographic grating, the super surface and the liquid crystal device, diffraction efficiency of the coupling-in area and the coupling-out area on incident light with preset polarization states can be improved.
In an embodiment, as shown in fig. 5, the optical waveguide device further includes a protective cover 31, where the protective cover 31 is disposed near the first surface 11a of the waveguide layer, and the protective cover 31 is used to protect the in-coupling region 111 and the out-coupling region 112 of the waveguide layer 11. By means of which the function of protecting the waveguide layer 11, the in-coupling region 111 and the out-coupling region 112 is achieved.
In an embodiment, as shown in fig. 6, the protective cover 31 is connected to the first surface 11a of the waveguide layer 11 by an adhesive 41, where the protective cover 31 is spaced from the waveguide layer 11. The protective cover plate and the waveguide layer are adhered through the adhesive, so that the protective cover plate and the waveguide layer are kept relatively stable. The bonding glue 41 is used only at two end points of the first surface 11a of the waveguide layer 11 to connect with the first surface 11a of the waveguide layer 11, so that the weight of the optical waveguide device can be reduced, and the cost of the bonding glue can be saved.
In an embodiment, as shown in fig. 7, the protective cover 31 is connected to the first surface 11a of the waveguide layer 11 by an adhesive 41, where the adhesive 41 may fill a gap between the protective cover 31 and the first surface 11 a. The protective cover plate and the waveguide layer are adhered through the adhesive, so that the protective cover plate and the waveguide layer are kept relatively stable. And fill up the gap between protection apron and the first surface through laminating glue, can eliminate the air between protection apron and the first surface, the cavity internal air pressure between protection apron and the waveguide layer changes when avoiding environmental condition to change makes this cavity produce deformation to avoid diffraction optical waveguide display performance's decline, greatly improved optical waveguide assembly's performance stability and reliability.
In an embodiment, as shown in fig. 8, the waveguide layer may further include a relay region 51, where the relay region 51 is disposed between the coupling-in region 111 and the coupling-out region 112; the relay region 51 serves to change the transmission path of light so that the light can spread over the coupling-out region 112. For example, the light may be emitted over different outcoupling regions, or over a larger outcoupling region. The transmission path of the light can be changed by the relay region 51 so that the light can spread over the coupling-out region, increasing the exit pupil, and improving the uniformity of the light output.
It should be noted that, the relay area 51 may be disposed at any position between the coupling-in area 111 and the coupling-out area 112, as shown in fig. 8, and the first polarization reflecting layer 12 is further sandwiched between the relay area 51 and the coupling-in area 111 and the coupling-out area 112.
In one embodiment, as shown in fig. 9, the optical waveguide device includes a waveguide layer 11, a first polarization reflecting layer 12, and a second polarization reflecting layer 13 constituting an optical waveguide assembly 10; the optical waveguide device includes a plurality of optical waveguide components, and the plurality of optical waveguide components are stacked. The transmission of incident light with different wavebands is realized by arranging a plurality of optical waveguide components, so that the color virtual image display is realized.
Illustratively, the optical waveguide device includes three optical waveguide assemblies, such as the first optical waveguide assembly 10, the second optical waveguide assembly 20, and the third optical waveguide assembly 30 in fig. 9, the first optical waveguide assembly 10 including a waveguide layer 11, a first polarizing reflective layer 12, and a second polarizing reflective layer 13, the waveguide layer 11 including an in-coupling region 111 and an out-coupling region 112; the first and second polarization-reflecting layers 12 and 13 are disposed on both surfaces of the waveguide layer 11, and do not cover the coupling-in region 111 and the coupling-out region 112; the first optical waveguide assembly 10 further includes a protective cover 31, the protective cover 31 being disposed proximate the first surface 11a of the waveguide layer; the protective cover 31 is connected to the first surface 11a of the waveguide layer 11 by an adhesive 41. Similarly, the second and third optical waveguide assemblies 20 and 30 have the same structure as the first optical waveguide assembly 10, and thus the second and third optical waveguide assemblies 20 and 30 can refer to fig. 9 and the first optical waveguide assembly 10.
It should be noted that, the optical waveguide assembly transmits light of different wavebands, and parameters of the coupling-in area and the coupling-out area of each optical waveguide assembly are set to respond to light of different wavebands, so that light of different wavebands is coupled into different waveguide assemblies, and color virtual image display is finally realized.
In an embodiment, as shown in fig. 9, the optical waveguide device includes a first optical waveguide assembly 10, a second optical waveguide assembly 20, and a third optical waveguide assembly 30, where a coupling-in region and a coupling-out region of the waveguide layer in each optical waveguide assembly are used to couple in and out light of different wavelength bands, for example, a coupling-in region 111 and a coupling-out region 112 of the first optical waveguide assembly 10 are used to couple in and out light of a red wavelength band; the coupling-in region 221 and the coupling-out region 222 of the second optical waveguide assembly 20 are used to couple in and out light of the green light band; the coupling-in region 331 and the coupling-out region 332 of the third optical waveguide assembly 30 are used to couple in and out light in the blue band. The three optical waveguide assemblies are arranged to respectively transmit light of red light, green light and blue light wave bands, and the light is converged at the emergent end to realize multi-color emergent light, so that the transmission efficiency of light of each wave band can be improved, the transmission loss of light can be reduced, and the image brightness of the coupled light corresponding to the wave bands of the coupling-out region can be relatively improved, and the image color uniformity can be improved.
Illustratively, the light in the red, green and blue bands is polarized by the polarization component 21 to obtain the incident light with a polarized state, and the coupling-in region 111 of the first optical waveguide component 10 couples the light in the red band in the incident light into the optical waveguide 11 to propagate, and is reflected by the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, and is coupled out from the coupling-out region 112 to obtain the red light with a larger field angle. The coupling-in region 221 of the second optical waveguide assembly 20 couples the light with the green light band in the incident light into the optical waveguide 11 for propagation, and the light is coupled out from the coupling-out region 222 through the reflection of the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, so as to obtain the green light with a larger field angle. The coupling-in area 331 of the third optical waveguide assembly 30 couples light in the blue light band of the incident light into the optical waveguide 11 for propagation, and couples out from the coupling-out area 332 through reflection of the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, so as to obtain blue light with a larger field angle. The three optical waveguide assemblies are arranged to transmit light in red light, green light and blue light bands, so that multicolor emergent light with a larger field angle is realized.
Illustratively, the red light wave band is 625-740 nm, the green light wave band is 492-577 nm, and the blue light wave band is 440-475 nm, the coupling-in region 111 of the first optical waveguide assembly 10 couples the 625-740 nm wave band of the incident light into the optical waveguide 11 for propagation, and the light is coupled out from the coupling-out region 112 through the reflection of the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, so as to obtain the red light with a larger field angle. The coupling-in region 221 of the second optical waveguide assembly 20 couples light with a wavelength band of 492-577 nm in the incident light into the optical waveguide 11 for propagation, and the light is coupled out from the coupling-out region 222 through reflection of the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, so as to obtain green light with a larger field angle. The coupling-in area 331 of the third optical waveguide assembly 30 couples the light with 440-475 nm band in the incident light into the optical waveguide 11 for propagation, and couples out from the coupling-out area 332 after being reflected by the first polarizing reflective layer 12 and/or the second polarizing reflective layer 13, so as to obtain the blue light with a larger field angle. The three optical waveguide assemblies are arranged to transmit light in red light, green light and blue light bands, so that multicolor emergent light with a larger field angle is realized.
In one embodiment, as shown in fig. 10, the first optical waveguide assembly 10 and the second optical waveguide assembly 20, and the second optical waveguide assembly 20 and the third optical waveguide assembly 30 are closely connected, i.e., the two optical waveguide assemblies are not provided with protective cover plates, so that the volume of the optical waveguide device is reduced, and the cost of the optical waveguide device is reduced.
It should be noted that the number and types of the optical waveguide assemblies set in the optical waveguide device may be set according to actual situations, which is not limited in particular in the embodiments of the present invention, for example, the optical waveguide assemblies may also be provided with a coupling-in area and a coupling-out area for transmitting light in an infrared light band, so as to achieve the purpose of transmitting infrared light.
In an embodiment, as shown in fig. 9 or 10, the second polarizing reflective layer 13 and the first polarizing reflective layer 12 in the first optical waveguide assembly 10, the second optical waveguide assembly 20 and the third optical waveguide assembly 30 reflect the external strong light with the same polarization state as the polarizing reflective layer, so that the luminous flux of the external strong light entering the inner side of the near-eye display device is reduced, the interference of the external strong light on the virtual image is reduced, and the contrast of the virtual image is further improved.
According to the optical waveguide device in the embodiment, the incident light with the polarization state is diffracted to the waveguide layer through the coupling-in area, the diffraction efficiency of the coupling-in area can be improved by the incident light with the polarization state, the light which does not meet the total internal reflection condition can be reflected by the first polarization reflection layer and the second polarization reflection layer, so that the incident light with a larger angle is transmitted in the waveguide layer, the incident light area coupled out by the coupling-out area is larger, the viewing angle of the near-eye display device is greatly increased, the first polarization reflection layer and the second polarization reflection layer can reflect the external strong light with the same polarization state as the polarization reflection layer back, the light flux of the external strong light entering the inner side of the near-eye display device is reduced, the interference of the external strong light on the virtual image is reduced, and the contrast ratio of the virtual image is further improved, the viewing angle is increased, the brightness of the virtual image is further improved, and the use experience of a user is greatly improved.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a near-eye display device according to an embodiment of the present application.
As shown in fig. 11, the near-eye display device 200 includes an optical waveguide device 201, where the optical waveguide device 201 is an optical waveguide device provided in any of the foregoing embodiments, and the optical waveguide device 201 enables directional transmission of incident light, so that a user wearing the near-eye display device can view an image.
The near-eye display device includes, but is not limited to, augmented Reality (Augmented Reality, AR) glasses, AR helmets, mixed Reality (MR) glasses, MR helmets, and the like.
It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in this specification refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments. While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention.
Claims (13)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311852126.7A CN117784311A (en) | 2023-12-28 | 2023-12-28 | Optical waveguide devices and near-eye display devices |
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| CN202311852126.7A CN117784311A (en) | 2023-12-28 | 2023-12-28 | Optical waveguide devices and near-eye display devices |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118131388A (en) * | 2024-05-08 | 2024-06-04 | 南昌虚拟现实研究院股份有限公司 | AR display device adopting holographic optical waveguide |
| WO2025218175A1 (en) * | 2024-04-18 | 2025-10-23 | 珠海莫界科技有限公司 | Diffractive optical waveguide and manufacturing method therefor, near-eye display device, and ar glasses |
-
2023
- 2023-12-28 CN CN202311852126.7A patent/CN117784311A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025218175A1 (en) * | 2024-04-18 | 2025-10-23 | 珠海莫界科技有限公司 | Diffractive optical waveguide and manufacturing method therefor, near-eye display device, and ar glasses |
| CN118131388A (en) * | 2024-05-08 | 2024-06-04 | 南昌虚拟现实研究院股份有限公司 | AR display device adopting holographic optical waveguide |
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