WO2019136601A1 - Ar optical system and ar display device - Google Patents

Abstract

An AR optical system and an AR display device. The AR optical system comprises: a display assembly (10) used for displaying a virtual image, a lens (11), and a micro reflection mirror array (12) provided on the lens (11). The micro reflection mirror array (12) is located on the propagation path of light emitted by the display assembly (10); after being reflected by means of the micro reflection mirror array (12), the light emitted by the display assembly (10) is combined with ambient light incident on the lens (11) and then transmitted to the human eyes. According to the AR optical system and the AR display device, the depth of field of a virtual image can be increased, so that a user can clearly see the virtual image when viewing real scenes with different space depths.

Description

AR optical system and AR display device Technical field

The present invention relates to the field of augmented reality technologies, and in particular, to an AR optical system and an AR display device.

Background technique

Augmented Reality (AR) is a technology that calculates the position and angle of camera images in real time and adds corresponding images, videos, and 3D models. This technology superimposes virtual information into real-world scenes, enabling "seamless" integration of real-world information and virtual world information.

In the existing AR display device, the prismatic reflection mode, the off-axis surface reflection mode, the free-form surface prism method, the geometric waveguide method or the holographic waveguide method are generally used to image the virtual image at infinity or at a certain distance in front of the eye. .

However, the imaging method of the above virtual image has a defect that the depth of field of the virtual image is small. When the eye views a realistic scene of different distances, the virtual image may appear blurred.

Summary of the invention

Aspects of the present invention provide an AR optical system and an AR display device for increasing a depth of field of a virtual image so that a virtual image can be clearly seen when an eye views a real scene of a different spatial depth.

The invention provides an AR optical system, comprising:

a display assembly for displaying a virtual image, a lens, and a micro mirror array disposed on the lens;

Wherein the micromirror array is located on a propagation path of light emitted by the display component;

The light emitted by the display component is reflected by the micromirror array, and is combined with the ambient light incident on the lens to be transmitted to the human eye.

Further optionally, the lens includes: a first lens that is glued together and a second lens; the micro mirror array is disposed on a bonding surface of the first lens and the second lens, and the micro reflection The reflective surface of the mirror array is close to the human eye.

Further optionally, the micromirror array disposed on the lens comprises: a plurality of micromirrors or a plurality of micro-sized reflective films attached to the bonding surface according to a set dimension and a set arrangement pitch, or A microstructure etched on the bonding surface and plated with a reflective film.

Further optionally, the micromirror, the micro-sized reflective film or the microstructure has a pore size between 100 μm and 2 mm.

Further optionally, the angle between the glued surface and the front optical surface of the first lens close to the human eye is an acute angle, and the display component is disposed outside the end surface of the first lens; the display component The emitted light is incident on the micromirror array through an end surface of the first lens, and is reflected by the micro mirror array to the human eye.

Further optionally, an end surface of the first lens is perpendicular to a rear optical surface of the first lens remote from the human eye and the front optical surface, and a light emitting surface of the display component is parallel to the first lens An end surface; the light emitted by the display component is directly incident on the micro mirror array through an end surface of the first lens, and is reflected by the micro mirror array to a human eye; or the end surface of the first lens is An acute angle is oblique to the rear optical surface or the front optical surface of the first lens, and a light exiting surface of the display assembly is parallel to an end surface of the first lens;

After the light emitted by the display component passes through the end surface of the first lens, it is transmitted in the first lens in a total reflection manner, and is finally incident on the micro mirror array and reflected by the micro mirror array. To the human eye.

Further optionally, the display component includes: a display screen and a projection lens group; the projection lens group is located between the display screen and the micro mirror array.

Further optionally, the first lens and the second lens are glued in a direction of a line connecting the left and right eyes; or, the first lens and the second lens are perpendicular to a direction of a line connecting the left and right eyes. Gluing.

The present invention provides an AR display device including the AR optical system provided by the present invention and an optical system frame for fixing and making the AR optical system easy to wear.

Further optionally, the apparatus comprises a left eye AR optical system and a right eye AR optical system; the optical system frame comprising: an adjustable connection for connecting the left eye AR optical system and the right eye AR optical system mechanism.

In the AR optical system and the AR display device provided by the present invention, a micro mirror array is disposed on the lens, and the virtual image can enter the human eye through the micro mirror array and the ambient light incident from the optical system. In the above structure, the micromirror in the micromirror array serves as an aperture stop, and has a small size, so that the depth of field of the virtual image is increased, so that when the eye views a real scene with different spatial depths, it can also be clear. See the virtual image.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic structural diagram of an AR optical system according to an embodiment of the present invention;

2a is a schematic front view showing the structure of an AR optical system according to another embodiment of the present invention;

2b is a top plan view showing the structure of an AR optical system according to an embodiment of the present invention;

3 is a top plan view showing the structure of an AR optical system according to another embodiment of the present invention;

4a is a schematic structural diagram of a display assembly according to an embodiment of the present invention;

4b is an equivalent optical path diagram of an AR optical system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an AR optical system according to another embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of an AR display device according to an embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described in conjunction with the specific embodiments of the present invention and the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of an AR optical system according to an embodiment of the present invention. As shown in Figure 1, the optical system includes:

A display assembly 10 for displaying a virtual image, a lens 11 and a micro mirror array 12 disposed on the lens 11. The micromirror array 12 is located on the propagation path of the light emitted by the display assembly 10.

In the above structure, the light emitted by the display unit 10 is reflected by the micro mirror array 12, and is combined with the ambient light incident on the lens 11 to be transmitted to the human eye, so that the human eye can see the real scene and display assembly 10. The superposition of the virtual images shown.

In this embodiment, a micro mirror array is disposed on the lens, and the virtual image can enter the human eye through the micro mirror array and the ambient light incident from the optical system. In the above structure, the micromirror in the micromirror array serves as an aperture stop, and has a small size, so that the depth of field of the virtual image is increased, so that when the eye views a real scene with different spatial depths, it can also be clear. See the virtual image.

2a is a schematic structural diagram of an AR optical system according to another embodiment of the present invention. As shown in FIG. 2a, in an alternative embodiment, the lens 11 includes a first lens 111 and a second lens 112 that are glued together. The micromirror array 12 is disposed on the bonding surface of the first lens 111 and the second lens 112, and the reflecting surface of the micro mirror array 12 is close to the human eye.

The material of the first lens 111 and the second lens 112 may be glass or resin. The bonding surface between the first lens 111 and the second lens 112 may be a plane, a spherical surface, an aspheric surface or a free curved surface, etc., and is only illustrated in a plane in FIG. 2a and other figures, but it should be understood that other alternative embodiments The glued surface can also be other optional shapes.

Alternatively, the micro mirror array 12 can be composed of a plurality of micro-reflective units. Wherein, the plurality of micro-reflecting units may be optical elements independent of the lens 11, respectively, for example, may be a plurality of micro-mirrors or a plurality of reflecting films. A plurality of micromirrors or a plurality of reflective films may be attached to the bonding surface of the lens 11 in accordance with the set dimensions and the set arrangement pitch. Optionally, the plurality of micro-reflecting units may also be an optical structure integrated with the lens 11, such as a plurality of microstructures etched on the lens 11 and having a reflective function. The plurality of microstructures are etched onto the bonding surface of the lens 11 in accordance with the set dimensions and the set arrangement pitch and are plated with a reflective film.

Optionally, the aperture of each micro-reflecting unit in the micro-mirror array 12 can be between 100 μm and 2 mm. For example, when the micro-mirror array 12 is composed of micro-mirrors, the aperture of the controllable micro-mirror can be 100 μm. -2mm between. The advantage is that the small-sized micro-reflecting unit occludes the light of the real scene, so that the AR optical system has a better real-world perspective effect; at the same time, the small-sized micro-reflecting unit has lower stray light, making the person The virtual image seen by the eye has a higher contrast. In addition to this, the small-sized micro-reflection unit can match the resolution of the human eye and has a small chromatic aberration.

Optionally, the micro-mirror or the surface of the microstructure coated with the reflective film may be a plane, a spherical surface, an aspheric surface, a Fresnel surface, and a free-form surface, and the material of the micro-mirror or the reflective film may be silver, aluminum or the like. The material with high reflectivity is not limited in this embodiment.

Optionally, the surface for bonding on the first lens 111 and the second lens 112 may be a slope, and the micro mirror array 12 is disposed on a side of the inclined surface close to the human eye to reflect light incident thereon To the human eye. In an optional embodiment, when the bonding surface is a bevel, the bonding surface may be inclined toward the end of the first lens 111, that is, the angle between the bonding surface and the front optical surface of the first lens 111 near the human eye. It is an acute angle. Preferably, the angle of inclination of the glued surface can be at an angle of 45° with respect to the line of sight of the line of sight, which facilitates viewing of the image reflected by the micromirror array 12 by the user and facilitates processing. Wherein, the end refers to the other end of the first lens 111 or the second lens 112 except the end where the bonding surface is located.

The display assembly 10 is disposed outside the end surface of the first lens 111, and light emitted from the display assembly 10 is incident on the micro mirror array 12 through the end surface of the first lens 10, and is reflected by the micro mirror array 12 to the human eye. Optionally, in the case where the glue is inclined toward the end of the first lens 111, as shown in FIG. 2a and FIG. 2b, the lateral length of the front optical surface of the first lens 111 close to the human eye is greater than the rear optical distance from the human eye. The lateral length of the surface, at which time the light reflected by the micromirror array 12 penetrates the human eye through the front optical surface of the first lens 111.

It should be understood that the first lens 111 is on the right and the second lens 112 is on the left in FIGS. 2a and 2b. In other embodiments, the first lens 111 may be on the left and the second lens 112 may be on the right, not Let me repeat.

Optionally, as shown in FIG. 2b, the end surface of the first lens 111 is perpendicular to the rear optical surface of the first lens 111 and the front optical surface, and the light emitting surface of the display assembly 10 is parallel to the end surface of the first lens 111. The end face, that is, the face at the end. In the configuration shown in FIG. 2a, light emitted by the display assembly 10 is incident directly on the micromirror array 12 through the end face of the first lens 111, and is reflected by the micromirror array 12 to the human eye.

Optionally, as shown in FIG. 3, the end surface of the first lens 111 is inclined at an acute angle to the rear optical surface of the first lens 111, and the light emitting surface of the display assembly 10 is parallel to the end surface of the first lens 111. In the structure shown in FIG. 3, after the light emitted from the display unit 10 passes through the end face of the first lens 111, it is incident on the rear optical surface of the first lens 111 at a critical angle of total reflection, propagates inside the first lens 111, and finally enters. On the micromirror array 12, it is reflected by the micromirror array 12 to the human eye. It should be understood that the case where the end surface of the first lens 111 is inclined at an acute angle to the rear optical surface of the first lens 111 is illustrated in FIG. 3, and in other embodiments, the end surface of the first lens 111 may be inclined at an acute angle to the first lens 111. The front optical surface will not be described again.

Alternatively, the lateral length of the front optical surface of the first lens 111 and the lateral length of the rear optical surface of the second lens 112 may be the same, the lateral length of the rear optical surface of the first lens 111 and the lateral direction of the front optical surface of the second lens 112. The length can be the same. Through the above design, it is ensured that the glued surface faces the pupil of the human eye to provide a better virtual image viewing effect.

In the above or below embodiments, as shown in FIG. 4a, the display assembly 10 can include a display screen 101 and a projection lens group 102, wherein the projection lens group 102 is located between the display screen 101 and the micro mirror array 12.

In an alternative embodiment, display screen 101 is disposed within one focal length of projection lens group 102. FIG. 4b is an equivalent optical path diagram of an AR optical system according to an embodiment of the present invention. As shown in FIG. 4b, the display screen 101 can be enlarged by the projection component 102, and the enlarged virtual image 101 can be micro-reflected. The mirror array 12 enters the human eye. Optionally, the display screen 101 may be a LCOS (Liquid Crystal on Silicon) display system, a Micro-OLED (Micro-Organic Light-Emitting Diode) display system, or other micro display elements, or a laser. The display module such as the scanning system is not limited in this embodiment.

The projection assembly 102 can include a plurality of lenses, and is illustrated by two lenses in FIG. 4a. It should be understood that the projection assembly 102 provided by the embodiment of the present invention is not limited to the illustrated content. Optionally, each of the facets of the projection lens group 102 may be a flat surface, a spherical surface, an aspheric surface, a Fresnel surface, and a free curved surface. The lens material may be glass or resin, which is not limited in this embodiment. In the above-mentioned FIGS. 1 to 3, the case where the first lens 111 and the second lens 112 are glued in the direction of the connection of the left and right eyes is illustrated. In other alternative embodiments, as shown in FIG. 5, the first lens 111 and the second lens 112 can be glued in a direction perpendicular to the direction of the connection of the left and right eyes. For other structures, refer to the descriptions in FIGS. 1 to 3, and details are not described herein.

Optionally, the AR optical system provided by the embodiment of the present invention may be applied to an AR glasses, an AR camera, or an AR wearing device, or may be a head-up display applied to a front window glass, etc., but the invention includes but is not limited to this. It should be understood that all VR products that adopt the technical solutions provided by the embodiments of the present invention are within the protection scope of the present invention.

FIG. 6 is a schematic structural diagram of an AR display device according to an embodiment of the present invention. As shown in FIG. 6, the device includes an AR optical system 61 and an optical system frame 62 for fixing and making the AR optical system 61 easy to wear. Among them, the AR optical system 61 is as shown in the corresponding embodiment of FIGS. 1-5.

Optionally, the AR display device provided in this embodiment may be a single purpose or a dual purpose. When it is binocular, the AR display device includes a left eye AR optical system as shown and a right eye AR optical system. The optical system frame 62 includes an adjustable connection mechanism 63 for connecting the left-eye AR optical system and the right-eye AR optical system, and a temple 64 and the like.

Wherein, the adjustable connecting mechanism 63 can adjust the distance between the left and right eye AR optical systems according to the wearer's distance dimension by pulling or rotating, so that the AR optical system can be adapted to users with different distances.

It should be noted that the descriptions of “first” and “second” in this document are used to distinguish different messages, devices, modules, etc., and do not represent the order, nor the “first” and “second”. It is a different type.

It is also to be understood that the terms "comprises" or "comprising" or "comprising" or any other variations are intended to encompass a non-exclusive inclusion, such that a process, method, article, Other elements not explicitly listed, or elements that are inherent to such a process, method, commodity, or equipment. An element defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device including the element.

The above description is only an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims (10)

An AR optical system, comprising: a display assembly for displaying a virtual image, a lens, and a micro mirror array disposed on the lens; Wherein the micromirror array is located on a propagation path of light emitted by the display component; The light emitted by the display component is reflected by the micro mirror array, and is combined with the ambient light incident on the lens to be transmitted to the human eye. The AR optical system according to claim 1, wherein the lens comprises: a first lens and a second lens that are glued; the micro mirror array is disposed on the first lens and the second lens On the glued surface, and the reflective surface of the micromirror array is close to the human eye. The AR optical system according to claim 2, wherein the array of micromirrors disposed on the lens comprises: A plurality of micromirrors or a plurality of micro-sized reflective films adhered to the bonding surface according to a set dimension and a set arrangement pitch, or a microstructure etched on the bonding surface and plated with a reflective film. The AR optical system according to claim 3, wherein the micromirror, the micro-sized retroreflective film or the microstructure has an aperture between 100 μm and 2 mm. The AR optical system according to claim 2, wherein an angle between the bonding surface and a front optical surface of the first lens close to a human eye is an acute angle, and the display component is disposed at the first Outside the end face of the lens; Light emitted by the display assembly is incident on the micro mirror array through an end surface of the first lens, and is reflected by the micro mirror array to a human eye. The AR optical system according to claim 5, wherein an end surface of the first lens is perpendicular to a rear optical surface of the first lens remote from the human eye and the front optical surface, and the display assembly The light emitting surface is parallel to the end surface of the first lens; the light emitted by the display component is directly incident on the micro mirror array through the end surface of the first lens, and is reflected by the micro mirror array to the human eye; or, An end surface of the first lens is inclined at an acute angle to the rear optical surface or the front optical surface of the first lens, and a light emitting surface of the display assembly is parallel to an end surface of the first lens; the display Light emitted by the component passes through the end surface of the first lens, is transmitted in the first lens in a total reflection manner, and is finally incident on the micro mirror array, and is reflected by the micro mirror array to the human eye. . The AR optical system according to any one of claims 1 to 6, wherein the display component comprises: a display screen and a projection lens group; the projection lens group is located at the display screen and the micromirror Between arrays. The AR optical system according to any one of claims 2 to 6, wherein the first lens and the second lens are glued in a line direction of the left and right eyes; or, the first lens and the first lens are The second lens is glued in a direction perpendicular to a line direction of the left and right eyes. An AR display device comprising the AR optical system according to any one of claims 1 to 8 and an optical system frame for fixing and making the AR optical system easy to wear. The apparatus according to claim 9, wherein said apparatus comprises a left eye AR optical system and a right eye AR optical system; The optical system frame includes an adjustable connection mechanism for connecting the left-eye AR optical system and the right-eye AR optical system.

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