Binocular display diffraction optical waveguide device

Abstract

The invention provides a binocular display diffraction optical waveguide device. The binocular display diffraction optical waveguide device comprises a waveguide substrate, and a coupling-in grating, a first turning grating, a second turning grating, a first coupling-out grating and a second coupling-out grating which are arranged on the waveguide substrate. A first set area of the first turning grating is a two-dimensional grating, other areas except the first set area in the first turning grating adopt one-dimensional gratings or two-dimensional gratings, and a second set area in the second turning grating is a two-dimensional grating. One-dimensional gratings or two-dimensional gratings are adopted in other areas, except the second set area, in the second turning grating, and the position of an eye box corresponding to the left eye of a person can be adjusted by changing the arrangement mode of the first turning grating in the waveguide base body; the position of the eye box corresponding to the right eye of a person can be adjusted by changing the arrangement mode of the second turning grating on the waveguide substrate.

Description

Technical Field

[0001] The invention relates to the technical field of diffraction light waveguides, and in particular to a binocular display diffraction light waveguide device. Background Art

[0002] Augmented reality (AR) technology refers to the use of certain technical means to provide users with additional information in the real world (the so-called "enhancement"). This technology organically combines the images of the virtual world and the scenes of the real world, and deeply integrates the calculated information with the real world, thereby providing users with richer information and immersive experience.

[0003] Augmented reality technology can be implemented through many hardware platforms, among which the most immersive is wearable augmented reality devices, namely AR glasses. The hardware form of this method is a simple pair of glasses that guide light into the human eye through the microstructure on the surface of the lens. This hardware implementation method is the most convenient and is the mainstream technology of AR.

[0004] At present, the more mature AR glasses technology solutions are mainly divided into prism solution, bi rdbath solution, free-form surface solution, off-axis holographic lens solution and diffractive optical waveguide solution. Among them, diffractive optical waveguide is generally recognized by the industry as the ideal AR glasses technology solution for the future because of its advantages such as small size, light weight, large eye movement range, large field of view, and mass production.

[0005] The mainstream technical solution for AR glasses using diffraction waveguides on the market is to use two micro-optical machines to input images to two monocular diffraction waveguides respectively, and the two monocular diffraction waveguides output the images to the left and right eyes of the person respectively. The above solution has the following technical defects: 1. There is a position error between the assembly setting of the micro-optical machine and the diffraction waveguide for outputting images to the left eye of the person and the assembly setting of the micro-optical machine and the diffraction waveguide for outputting images to the right eye of the person. During the assembly process of AR glasses, binocular imaging is required to improve the visual effect. 2. Increase the equipment weight, equipment volume and equipment cost of AR glasses.

[0006] In order to solve the above problems, the existing technology has made the following improvements: a micro optical machine is used to input an image to a diffractive optical waveguide for binocular display, and the diffractive optical waveguide for binocular display outputs the image to the left and right eyes of the person, without the need for binocular image combination, which greatly reduces the weight, volume and cost of the equipment. However, the existing diffractive optical waveguide for binocular display has the defect that it is difficult to adjust the eye box position. Summary of the invention

[0007] In order to overcome the defects of the prior art, the present invention provides a binocular display diffraction light waveguide device.

[0008] The present invention is achieved through the following technical solutions:

[0009] The present invention provides a binocular display diffraction light waveguide device, comprising a waveguide substrate and a grating structure arranged on the waveguide substrate, wherein the grating structure comprises an in-coupling grating, a first turning grating, a second turning grating, a first out-coupling grating and a second out-coupling grating;

[0010] The first setting area of ​​the first turning grating is a two-dimensional grating, and the other areas of the first turning grating except the first setting area adopt one-dimensional grating or two-dimensional grating, the second setting area of ​​the second turning grating is a two-dimensional grating, and the other areas of the second turning grating except the second setting area adopt one-dimensional grating or two-dimensional grating;

[0011] The eye box position corresponding to the left eye of a person can be adjusted by changing the arrangement of the first turning grating in the waveguide matrix, and the eye box position corresponding to the right eye of a person can be adjusted by changing the arrangement of the second turning grating in the waveguide matrix.

[0012] Furthermore, the incident light beam is divided into a first diffraction light beam and a second diffraction light beam by the diffraction effect of the coupling-in grating, and propagates through total reflection in the waveguide matrix; the first diffraction light beam propagating through total reflection in the waveguide matrix is ​​transmitted to the first coupling-out grating via the first turning grating, and a portion of the first diffraction light beam is coupled out of the person's left eye through the diffraction effect of the first coupling-out grating; the second diffraction light beam propagating through total reflection in the waveguide matrix is ​​transmitted to the second coupling-out grating via the second turning grating, and a portion of the second diffraction light beam is coupled out of the person's right eye through the diffraction effect of the second coupling-out grating.

[0013] Furthermore, the first set area is a coverage area where the first diffracted light beam propagates through total reflection of the waveguide matrix in the area where the first turning grating is located;

[0014] The second set area is a coverage area where the second diffracted light beam propagates through total reflection of the waveguide matrix in the area where the second turning grating is located.

[0015] Furthermore, the center of the coupling-in grating is arranged on the central axis of the waveguide substrate in the vertical direction, the coupling-in grating is symmetrically arranged about the central axis of the waveguide substrate in the vertical direction, the first turning grating and the second turning grating are symmetrically arranged about the central axis of the waveguide substrate in the vertical direction, and the first decoupling grating and the second decoupling grating are symmetrically arranged about the central axis of the waveguide substrate in the vertical direction.

[0016] Furthermore, the coupling-in grating is a one-dimensional grating or a two-dimensional grating.

[0017] Furthermore, the first outcoupling grating is a one-dimensional grating or a two-dimensional grating, and the second outcoupling grating is a one-dimensional grating or a two-dimensional grating.

[0018] Furthermore, the coupling-in grating and the first coupling-out grating have the same grating period, and the grating lines of the coupling-in grating and the first coupling-out grating have the same direction;

[0019] The coupling-in grating and the second coupling-out grating have the same grating period, and the coupling-in grating and the second coupling-out grating have the same grating line direction.

[0020] Further, the first turning grating includes a first sub-area turning grating, a second sub-area turning grating and a third sub-area turning grating; the first sub-area turning grating adopts a two-dimensional grating, the second sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating, and the third sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating;

[0021] The first sub-area turning grating is arranged in a first set area of ​​the first turning grating, the second sub-area turning grating is arranged closely in an upper area of ​​the first set area, and the third sub-area turning grating is arranged closely in a lower area of ​​the first set area;

[0022] The second turning grating includes a fourth sub-area turning grating, a fifth sub-area turning grating and a sixth sub-area turning grating; the fourth sub-area turning grating adopts a two-dimensional grating, the fifth sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating, and the sixth sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating;

[0023] The fourth sub-area turning grating is arranged in the second setting area of ​​the second turning grating, the fifth sub-area turning grating is closely arranged in the upper area of ​​the second setting area, and the sixth sub-area turning grating is closely arranged in the lower area of ​​the second setting area.

[0024] Further, the first diffracted light beam propagating by total reflection in the waveguide matrix enters the first partition turning grating, a portion of the first diffracted light beam continues to propagate along the original direction to the first out-coupling grating, a portion of the first diffracted light beam enters the second partition turning grating through the diffraction effect of the grating vector K1 of the first partition turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the second partition turning grating, and the remaining portion of the first diffracted light beam enters the third partition turning grating through the diffraction effect of the grating vector K2 of the first partition turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the third partition turning grating;

[0025] The second diffraction light beam propagates by total reflection in the waveguide matrix and enters the fourth partition turning grating. A part of the second diffraction light beam continues to propagate along the original direction to the second out-coupling grating. A part of the second diffraction light beam enters the fifth partition turning grating through the diffraction effect of the grating vector K3 of the fourth partition turning grating and is transmitted to the second out-coupling grating through the diffraction effect of the fifth partition turning grating. The remaining part of the second diffraction light beam enters the sixth partition turning grating through the diffraction effect of the grating vector K4 of the fourth partition turning grating and is transmitted to the second out-coupling grating through the diffraction effect of the sixth partition turning grating.

[0026] Furthermore, the angle α between the grating vector K1 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is in the range of 30°<α<80°;

[0027] The angle β between the grating vector K2 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is in the range of -30°<β<-80°;

[0028] The angle θ between the grating vector K3 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction is in the range of 30°<θ<80°;

[0029] The angle φ between the grating vector K4 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction has a value range of -30°<φ<-80°.

[0030] Further, when |α|=|β|, and the partition sizes of the first partition turning grating, the second partition turning grating, and the third partition turning grating in the first turning grating are changed, so that the center position of the eye box corresponding to the left eye of the person and the center position of the coupling grating are located on the same horizontal line;

[0031] When |α|>|β|, and the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the left eye of the person on the waveguide substrate is greater than the vertical height of the center position of the coupling grating on the waveguide substrate;

[0032] When |α|<|β|, and the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the left eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0033] Further, when |θ|=|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating, and the sixth partition turning grating in the second turning grating are changed, so that the center position of the eye box corresponding to the right eye of the person and the center position of the coupling grating are located on the same horizontal line;

[0034] When |θ|>|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the right eye of the person on the waveguide substrate is greater than the vertical height of the center position of the coupling grating on the waveguide substrate;

[0035] When |θ|<|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the right eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0036] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0037] The present invention provides a binocular display diffraction light waveguide device, comprising a waveguide substrate and an in-coupling grating, a first turning grating, a second turning grating, a first out-coupling grating and a second out-coupling grating arranged on the waveguide substrate. The incident light beam is divided into a first diffraction light beam and a second diffraction light beam by the diffraction effect of the in-coupling grating, and the incident light beam is totally reflected and propagated in the waveguide substrate. The first diffraction light beam totally reflected and propagated in the waveguide substrate is transmitted to the first out-coupling grating through the first turning grating and is coupled out of a person's left eye through the diffraction effect of the first out-coupling grating. The second diffraction light beam totally reflected and propagated in the waveguide substrate is transmitted to the second out-coupling grating through the second turning grating and is coupled out of a person's right eye through the diffraction effect of the second out-coupling grating. The first setting area of ​​the first turning grating is a two-dimensional grating, and the other areas of the first turning grating except the first setting area adopt one-dimensional grating or two-dimensional grating. The second setting area of ​​the second turning grating is a two-dimensional grating, and the other areas of the second turning grating except the second setting area adopt one-dimensional grating or two-dimensional grating. By changing the setting method of the first turning grating on the waveguide matrix, the eye box position corresponding to the left eye of the person can be adjusted, and by changing the setting method of the second turning grating on the waveguide matrix, the eye box position corresponding to the right eye of the person can be adjusted, thereby greatly increasing the eye box position adjustment range of the binocular display diffraction light waveguide device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 A schematic diagram of the grating structure design of a conventional binocular display diffraction light waveguide device is shown as an example;

[0040] Figure 2 A schematic diagram of the grating structure design of the first example of the binocular display diffraction light waveguide device of the present invention;

[0041] Figure 3 for Figure 2 Schematic diagram of light propagation of a binocular display diffraction light waveguide device;

[0042] Figure 4 A schematic diagram of a grating structure design of a second example of a binocular display diffraction light waveguide device according to the present invention;

[0043] Figure 5 for Figure 4 Schematic diagram of light propagation of a binocular display diffraction light waveguide device;

[0044] Figure 6 A schematic diagram of a grating structure design of a third example of a binocular display diffraction light waveguide device according to the present invention;

[0045] Figure 7 for Figure 6 Schematic diagram of light propagation of a binocular display diffraction light waveguide device;

[0046] Figure 8 for Figure 2 The K-space design schematic diagram of the binocular display diffraction light waveguide device of the present invention is shown;

[0047] Fig. 9 Schematic diagram of the grating structure design of the fourth example of the binocular display diffraction light waveguide device of the present invention.

[0048] Among them, 1-waveguide substrate, 2-coupling grating, 3-first turning grating, 3-1-first partition turning grating, 3-2-second partition turning grating, 3-3-third partition turning grating, 4-second turning grating, 4-1-fourth partition turning grating, 4-2-fifth partition turning grating, 4-3-sixth partition turning grating, 5-first coupling-out grating, 6-second coupling-out grating. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] like Figure 1 , which is a schematic diagram of an existing binocular display diffraction optical waveguide device, includes a waveguide substrate 1 and a grating structure arranged on the waveguide substrate 1, wherein the grating structure includes an in-coupling grating 2, a first turning grating 3, a second turning grating 4, a first out-coupling grating 5 and a second out-coupling grating 6. The in-coupling grating adopts a one-dimensional grating, the first turning grating and the second turning grating adopt a one-dimensional grating, and the first out-coupling grating and the second out-coupling grating adopt a one-dimensional grating.

[0051] The projection beam of a single micro-optical machine is used as an incident beam to hit the coupling grating position. The incident beam is divided into a first diffraction beam and a second diffraction beam by the diffraction effect of the coupling grating, and is totally reflected and propagated in the waveguide matrix. The first diffraction beam propagated by total reflection in the waveguide matrix is ​​transmitted to the first coupling grating via the first turning grating, and part of the first diffraction beam is coupled out of the left eye of the person through the diffraction effect of the first coupling grating. The second diffraction beam propagated by total reflection in the waveguide matrix is ​​transmitted to the second coupling grating via the second turning grating, and part of the second diffraction beam is coupled out of the right eye of the person through the diffraction effect of the second coupling grating.

[0052] like Figure 1 In the existing binocular display diffraction optical waveguide shown, for the eye box position corresponding to the left eye of a person and the eye box position corresponding to the right eye of a person, the longitudinal position of the eye box is often located in the lower area of ​​the center position of the coupling grating, and the eye box position is difficult to adjust up and down.

[0053] In order to solve the defects of the prior art, the present invention provides a binocular display diffraction light waveguide device, which includes a waveguide substrate and a grating structure arranged on the waveguide substrate.

[0054] The grating structure includes an in-coupling grating, a first turning grating, a second turning grating, a first out-coupling grating and a second out-coupling grating.

[0055] The center of the coupling-in grating is arranged on the central axis of the waveguide substrate in the vertical direction, the coupling-in grating is arranged symmetrically about the central axis of the waveguide substrate in the vertical direction, the first turning grating and the second turning grating are arranged symmetrically about the central axis of the waveguide substrate in the vertical direction, and the first coupling-out grating and the second coupling-out grating are arranged symmetrically about the central axis of the waveguide substrate in the vertical direction.

[0056] The first set area of ​​the first turning grating is a two-dimensional grating, and other areas of the first turning grating except the first set area adopt one-dimensional grating or two-dimensional grating. The second set area of ​​the second turning grating is a two-dimensional grating, and other areas of the second turning grating except the second set area adopt one-dimensional grating or two-dimensional grating.

[0057] Among them, the first set area is the coverage area where the first diffraction light beam propagates through total reflection of the waveguide matrix in the area where the first turning grating is located, so that the first diffraction light beam can be fully transmitted to the upper and lower sides of the first turning grating in the first set area after the grating diffraction effect in the first set area of ​​the first turning grating.

[0058] The second set area is the coverage area where the second diffraction light beam propagates through total reflection of the waveguide matrix within the area where the second turning grating is located, so that the second diffraction light beam can be fully transmitted to the upper and lower sides of the second turning grating in the second set area after the grating diffraction effect within the second set area of ​​the second turning grating.

[0059] The incident light beam is divided into a first diffracted light beam and a second diffracted light beam by the diffraction effect of the coupled grating, and the light beams are propagated by total reflection in the waveguide matrix.

[0060] The first diffracted light beam propagates by total reflection in the waveguide matrix and enters the two-dimensional grating in the first set area of ​​the first turning grating. Part of the first diffracted light beam continues to propagate along the original direction and enters the first outcoupling grating. Part of the first diffracted light beam enters the one-dimensional grating or two-dimensional grating in other areas of the first turning grating except the first set area through the diffraction effect of the two-dimensional grating in the first set area of ​​the first turning grating, and enters the first outcoupling grating through the diffraction effect of the one-dimensional grating or two-dimensional grating in other areas of the first turning grating except the first set area. Part of the first diffracted light beam that enters the first outcoupling grating is coupled out of the left eye of the person through the diffraction effect of the first outcoupling grating.

[0061] The second diffracted light beam propagates by total reflection in the waveguide matrix and enters the two-dimensional grating in the second set area of ​​the second turning grating. Part of the second diffracted light beam continues to propagate along the original direction and enters the second outcoupling grating. Part of the second diffracted light beam enters the one-dimensional grating or two-dimensional grating in other areas of the second turning grating except the second set area through the diffraction effect of the two-dimensional grating in the second set area of ​​the second turning grating, and enters the second outcoupling grating through the diffraction effect of the one-dimensional grating or two-dimensional grating in other areas of the second turning grating except the second set area. Part of the second diffracted light beam that enters the second outcoupling grating is coupled out of the right eye of the person through the diffraction effect of the second outcoupling grating.

[0062] The binocular display diffraction optical waveguide of the present invention can adjust the eye box position corresponding to the left eye of a person by changing the arrangement of the first turning grating on the waveguide substrate, and can adjust the eye box position corresponding to the right eye of a person by changing the arrangement of the second turning grating on the waveguide substrate. For example, the eye box position corresponding to the left eye of a person is adjusted by changing the grating vector direction, partition size, etc. of the first turning grating arranged on the waveguide substrate, and the eye box position corresponding to the right eye of a person is adjusted by changing the grating vector direction, partition size, etc. of the second turning grating arranged on the waveguide substrate.

[0063] In the binocular display diffraction light waveguide of the present invention, the coupling-in grating may be a one-dimensional grating or a two-dimensional grating. The coupling-in grating is preferably a one-dimensional grating, and the binocular display diffraction light waveguide uses two diffraction directions of the one-dimensional grating as the coupling-in grating to divide the incident light beam into a first diffraction light beam transmitted to the left eye of the person and a second diffraction light beam transmitted to the right eye of the person, thereby increasing the light energy utilization rate of the binocular display diffraction light waveguide.

[0064] In the binocular display diffraction optical waveguide of the present invention, the first outcoupling grating can be a one-dimensional grating or a two-dimensional grating, and the second outcoupling grating can be a one-dimensional grating or a two-dimensional grating. The first outcoupling grating and the second outcoupling grating are preferably one-dimensional gratings, which can greatly reduce the rainbow pattern phenomenon of the diffraction optical waveguide. It should be noted that, if Figure 1 In the prior art binocular display diffraction optical waveguide shown, when the eye box is located close to the propagation path of the main light beam in the coupled-in light beam of the coupled-in grating, the first turning grating and the first out-coupling grating need to be arranged overlappingly on the waveguide substrate (equivalent to the first out-coupling grating having a two-dimensional grating structure), and the second turning grating and the second out-coupling grating need to be arranged overlappingly on the waveguide substrate (equivalent to the second out-coupling grating having a two-dimensional grating structure), so that the first out-coupling grating and the second out-coupling grating must include a two-dimensional grating structure, and cannot adopt a one-dimensional grating structure, thereby causing the diffraction optical waveguide to have a serious rainbow pattern phenomenon. The present invention can make the first out-coupling grating and the second out-coupling grating adopt a one-dimensional grating through the above-mentioned grating design of the first turning grating and the second turning grating, thereby greatly weakening the rainbow pattern phenomenon of the diffraction optical waveguide.

[0065] In the binocular display diffraction optical waveguide of the present invention, the grating period of the above-mentioned coupling-in grating is the same as that of the first coupling-out grating, the grating line direction of the coupling-in grating is the same as that of the first coupling-out grating, the grating period of the above-mentioned coupling-in grating is the same as that of the second coupling-out grating, and the grating line direction of the coupling-in grating is the same as that of the second coupling-out grating, thereby satisfying that the grating vector of the coupling-in grating is closed to the grating vector of the first coupling-out grating and the grating vector of the second coupling-out grating, respectively, thereby ensuring that the image displayed by the optical waveguide is distortion-free and aberration-free compared to the projected image of the optical machine.

[0066] There are no specific requirements for the grating period and grating lines of the two-dimensional grating in the first set area of ​​the first turning grating and the one-dimensional grating or two-dimensional grating used in other areas of the first turning grating except the first set area. There are no specific requirements for the grating period and grating lines of the two-dimensional grating in the second set area of ​​the second turning grating and the one-dimensional grating or two-dimensional grating used in other areas of the second turning grating except the second set area. However, in order to ensure that the image displayed by the optical waveguide is distortion-free compared to the projected image of the optical machine, it is still necessary to make the grating vector of the coupled-in grating, the grating vector of the first turning grating and the grating vector of the first coupled-out grating satisfy the closure condition, and the grating vector of the coupled-in grating, the grating vector of the second turning grating and the grating vector of the second coupled-out grating satisfy the closure condition.

[0067] In the binocular display diffraction optical waveguide of the present invention, for the first turning grating, under the condition that the first set area of ​​the first turning grating is a two-dimensional grating, and other areas of the first turning grating except the first set area adopt one-dimensional grating or two-dimensional grating, the number of partitions of the first turning grating is not specifically limited. For the second turning grating, under the condition that the second set area of ​​the second turning grating is a two-dimensional grating, and other areas of the second turning grating except the second set area adopt one-dimensional grating or two-dimensional grating, the number of partitions of the second turning grating is not specifically limited.

[0068] In the binocular display diffraction waveguide of the present invention, there is no limitation on the grating groove types of the coupling-in grating, the first turning grating, the second turning grating, the first coupling-out grating and the second coupling-out grating, and they can be rectangular gratings, triangular gratings, inclined gratings, circular gratings, elliptical gratings, or other regular or irregular polygonal gratings.

[0069] In the binocular display diffraction optical waveguide of the present invention, there is no limitation on the appearance of the coupling-in grating, the first turning grating, the second turning grating, the first coupling-out grating and the second coupling-out grating, for example, they can be rectangular, parallelogram, triangle, circle, ellipse or other polygons.

[0070] In the binocular display diffraction waveguide of the present invention, the first turning grating, the second turning grating, the first outcoupling grating and the second outcoupling grating can adopt groove depth gradient gratings, so as to adjust the diffraction efficiency of different areas of the grating and improve the light efficiency of the diffraction waveguide.

[0071] like Figure 2 , Figure 4 as well as Figure 6, which is a schematic diagram of a specific example of a binocular display diffractive light waveguide device of the present invention, the exemplary binocular display diffractive light waveguide device comprises a waveguide substrate 1 and a grating structure arranged on the waveguide substrate 1. The grating structure comprises an in-coupling grating 2, a first turning grating 3, a second turning grating 4, a first out-coupling grating 5 and a second out-coupling grating 6.

[0072] Among them, the center of the coupling-in grating 2 is set on the central axis of the waveguide matrix 1 in the vertical direction, the coupling-in grating 2 is symmetrically arranged about the central axis of the waveguide matrix 1 in the vertical direction, the first turning grating 3 and the second turning grating 4 are symmetrically arranged about the central axis of the waveguide matrix 1 in the vertical direction, and the first coupling-out grating 5 and the second coupling-out grating 6 are symmetrically arranged about the central axis of the waveguide matrix 1 in the vertical direction.

[0073] The coupling-in grating 2 adopts a one-dimensional grating, the first coupling-out grating 5 adopts a one-dimensional grating, the second coupling-out grating 6 adopts a one-dimensional grating, the coupling-in grating 2 has the same grating period as the first coupling-out grating 5, the grating lines of the coupling-in grating 2 and the first coupling-out grating 5 have the same direction, the coupling-in grating 2 has the same grating period as the second coupling-out grating 6, and the grating lines of the coupling-in grating 2 and the second coupling-out grating 6 have the same direction. The coupling-in grating 2 has a grating vector K01 and a grating vector K02, the first coupling-out grating 5 has a grating vector K5, and the second coupling-out grating 6 has a grating vector K6.

[0074] Among them, the first turning grating example includes a first partition turning grating 3-1, a second partition turning grating 3-2 and a third partition turning grating 3-3. The first partition turning grating 3-1 adopts a two-dimensional grating, the second partition turning grating 3-2 adopts a one-dimensional grating, and the third partition turning grating 3-3 adopts a one-dimensional grating. The grating period and grating line direction of the one-dimensional grating in the second partition turning grating 3-2 are the same as the grating period and grating line direction of the first dimension grating in the two-dimensional grating in the first partition turning grating 3-1, and the grating period and grating line direction of the one-dimensional grating in the third partition turning grating 3-3 are the same as the grating period and grating line direction of the second dimension grating in the two-dimensional grating in the first partition turning grating 3-1. The first partition turning grating 3-1 is set in the first set area of ​​the first turning grating, the second partition turning grating 3-2 is closely set in the upper area of ​​the first set area, and the third partition turning grating 3-3 is closely set in the lower area of ​​the first set area.

[0075] In the first turning grating, the first sub-area turning grating 3-1 has a grating vector K1 and a grating vector K2, the second sub-area turning grating 3-2 has a grating vector K2, and the third sub-area turning grating 3-3 has a grating vector K1.

[0076] The angle α between the grating vector K1 direction of the two-dimensional grating of the first subarea turning grating 3-1 in the first turning grating and the horizontal direction is in the range of 30°<α<80°. The angle β between the grating vector K2 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating 3-1 and the horizontal direction is in the range of -30°<β<-80°.

[0077] Among them, the second turning grating example includes the fourth partition turning grating 4-1, the fifth partition turning grating 4-2 and the sixth partition turning grating 4-3. The fourth partition turning grating 4-1 adopts a two-dimensional grating, the fifth partition turning grating 4-2 adopts a one-dimensional grating, and the sixth partition turning grating 4-3 adopts a one-dimensional grating. The grating period and grating line direction of the one-dimensional grating in the fifth partition turning grating 4-2 are the same as the grating period and grating line direction of the first dimension grating in the two-dimensional grating in the fourth partition turning grating 4-1, and the grating period and grating line direction of the one-dimensional grating in the sixth partition turning grating 4-3 are the same as the grating period and grating line direction of the second dimension grating in the two-dimensional grating in the fourth partition turning grating 4-1. The fourth partition turning grating 4-1 is set in the second set area of ​​the second turning grating, the fifth partition turning grating 4-2 is closely set in the upper area of ​​the second set area, and the sixth partition turning grating 4-3 is closely set in the lower area of ​​the second set area.

[0078] In the second turning grating, the fourth sub-area turning grating 4-1 has a grating vector K3 and a grating vector K4, the fifth sub-area turning grating 4-2 has a grating vector K4, and the sixth sub-area turning grating 4-3 has a grating vector K3.

[0079] The angle θ between the grating vector K3 direction of the two-dimensional grating of the fourth sub-area turning grating 4-1 in the second turning grating and the horizontal direction is in the range of 30°<θ<80°. The angle φ between the grating vector K4 direction of the two-dimensional grating of the fourth sub-area turning grating 4-1 in the second turning grating and the horizontal direction is in the range of -30°<φ<-80°.

[0080] The incident light beam is divided into a first diffracted light beam (corresponding to the grating vector K01 of the coupled grating) and a second diffracted light beam (corresponding to the grating vector K02 of the coupled grating) by the diffraction effect of the coupled grating, and propagates by total reflection in the waveguide matrix.

[0081] The first diffracted light beam propagates by total reflection in the waveguide matrix and enters the first partition turning grating. A part of the diffracted light beam continues to propagate along the original direction to the first out-coupling grating. A part of the diffracted light beam enters the second partition turning grating through the diffraction effect of the grating vector K1 of the first partition turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the grating vector K2 of the second partition turning grating. The remaining part of the diffracted light beam enters the third partition turning grating through the diffraction effect of the grating vector K1 of the first partition turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the grating vector K1 of the third partition turning grating. The part of the first diffracted light beam that enters the first out-coupling grating is coupled out of the left eye of the person through the diffraction effect of the grating vector K5 of the first out-coupling grating (such as Figure 3 , Figure 5 , Figure 7 ).

[0082] The second diffracted light beam propagates by total reflection in the waveguide matrix and enters the fourth sub-area turning grating. A part of the diffracted light beam continues to propagate along the original direction to the second out-coupling grating. A part of the diffracted light beam enters the fifth sub-area turning grating through the diffraction effect of the grating vector K3 of the fourth sub-area turning grating and is transmitted to the second out-coupling grating through the diffraction effect of the grating vector K4 of the fifth sub-area turning grating. The remaining part of the diffracted light beam enters the sixth sub-area turning grating through the diffraction effect of the grating vector K3 of the sixth sub-area turning grating and is transmitted to the second out-coupling grating. The part of the second diffracted light beam that enters the second out-coupling grating is coupled out of the right eye of the person through the diffraction effect of the grating vector K6 of the second out-coupling grating (such as Figure 3 , Figure 5 , Figure 7 ).

[0083] Figure 8 for Figure 2 The K-space design schematic diagram of the binocular display diffraction optical waveguide device of the present invention is shown in FIG. Figure 8Note: The inner circular surface represents the projection of the K vector on the waveguide plane of all possible propagation states of light when it propagates in the air with a refractive index of n1, and the outer circular surface represents the projection of the K vector on the waveguide plane of all possible propagation states of light when it propagates in the waveguide medium with a refractive index of n2. The rectangular frame area represents the in-plane component frame of the incident k vector of the FOV projected by the optical machine in the waveguide plane. In the figure, K01 and KO2 represent two grating vectors of the coupled-in grating, K5 represents the grating vector of the first coupled-out grating, K6 represents the grating vector of the second coupled-out grating, K1 above the horizontal dotted line represents a grating vector of the first partition turning grating, K2 above the horizontal dotted line represents the grating vector of the second partition turning grating, K2 below the horizontal dotted line represents another grating vector of the first partition turning grating, K1 below the horizontal dotted line represents the grating vector of the third partition turning grating, K3 above the horizontal dotted line represents a grating vector of the fourth partition turning grating, K4 above the horizontal dotted line represents the grating vector of the fifth partition turning grating, K4 below the horizontal dotted line represents another grating vector of the fourth partition turning grating, and K3 below the horizontal dotted line represents the grating vector of the sixth partition turning grating.

[0084] It should be noted that Figure 4 as well as Figure 6 The schematic diagram of the binocular display diffraction optical waveguide device also has a corresponding K space design schematic diagram, which is not shown in detail here. Figure 8 The difference is that the directions and sizes of the grating vectors K1, K2, K3 and K4 are different, but it is still necessary to ensure that the grating vectors K1, K2, K3, K4, K5 and K6 satisfy the corresponding vector closure relationship.

[0085] The eye box position corresponding to the left eye of a person can be adjusted by changing the arrangement of the first turning grating in the waveguide matrix, and the eye box position corresponding to the right eye of a person can be adjusted by changing the arrangement of the second turning grating in the waveguide matrix.

[0086] Definition: The angle between the grating vector K1 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is α.

[0087] The angle between the grating vector K2 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is β.

[0088] The angle between the grating vector K3 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction is θ.

[0089] The angle between the grating vector K4 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction is φ.

[0090] 1. For the case where the center position of the eye box corresponding to the left eye of a person and the center position of the coupling grating are on the same horizontal line, and the center position of the eye box corresponding to the right eye of a person and the center position of the coupling grating are on the same horizontal line:

[0091] Let |α|=|β|, and change the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating, so that the center position of the eye box corresponding to the left eye of the human being and the center position of the coupling grating are on the same horizontal line.

[0092] Let |θ|=|φ|, and change the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating, so that the center position of the eye box corresponding to the human right eye and the center position of the coupling grating are on the same horizontal line.

[0093] For example, Figure 2 As shown,

[0094] Let |α|=|β|, the first partition turning grating is symmetrically arranged about the set position, and the second partition turning grating and the third partition turning grating are symmetrically arranged about the set position.

[0095] Let |θ|=|φ|, the fourth partition turning grating is symmetrically arranged about the set position, and the fifth partition turning grating and the sixth partition turning grating are symmetrically arranged about the set position.

[0096] The above-mentioned setting position is a horizontal line passing through the center position of the coupling grating.

[0097] 2. For the case where the vertical height of the center position of the eye box corresponding to the left eye of a person in the waveguide matrix is ​​greater than the vertical height of the center position of the coupling grating in the waveguide matrix, and the vertical height of the center position of the eye box corresponding to the right eye of a person in the waveguide matrix is ​​greater than the vertical height of the center position of the coupling grating in the waveguide matrix:

[0098] Let |α|>|β|, and change the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating, so that the vertical height of the center position of the eye box corresponding to the left eye of the human body in the waveguide matrix is ​​greater than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0099] Let |θ|>|φ|, and change the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating, so that the vertical height of the center position of the eye box corresponding to the right eye of the human body in the waveguide matrix is ​​greater than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0100] For example, Figure 4 As shown,

[0101] Let |α|>|β|, and simultaneously change the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating, so that the grating partition area of ​​the second partition turning grating is larger than the partition area of ​​the first partition turning grating or the third partition turning grating, and the vertical height of the second partition turning grating on the waveguide matrix is ​​larger than the vertical height of the first partition turning grating or the third partition turning grating on the waveguide matrix.

[0102] Let |θ|>|φ|, and simultaneously change the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating, so that the grating partition area of ​​the fifth partition turning grating is larger than the partition area of ​​the fourth partition turning grating or the sixth partition turning grating, and the vertical height of the fifth partition turning grating on the waveguide matrix is ​​larger than the vertical height of the fourth partition turning grating or the sixth partition turning grating on the waveguide matrix.

[0103] 3. For the case where the vertical height of the center position of the eye box corresponding to the left eye of a person in the waveguide matrix is ​​less than the vertical height of the center position of the coupling grating in the waveguide matrix, and the vertical height of the center position of the eye box corresponding to the right eye of a person in the waveguide matrix is ​​less than the vertical height of the center position of the coupling grating in the waveguide matrix:

[0104] Let |α|<|β|, and change the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating, so that the vertical height of the center position of the eye box corresponding to the left eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0105] Let |θ|<|φ|, and change the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating, so that the vertical height of the center position of the eye box corresponding to the right eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

[0106] For example, Figure 6 As shown,

[0107] Let |α|<|β|, and simultaneously change the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating, so that the grating partition area of ​​the third partition turning grating is larger than the partition area of ​​the first partition turning grating or the second partition turning grating, and the vertical height of the third partition turning grating on the waveguide matrix is ​​larger than the vertical height of the first partition turning grating or the second partition turning grating on the waveguide matrix.

[0108] Let |θ|<|φ|, and simultaneously change the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating, so that the grating partition area of ​​the sixth partition turning grating is larger than the partition area of ​​the fourth partition turning grating or the fifth partition turning grating, and the vertical height of the sixth partition turning grating on the waveguide matrix is ​​larger than the vertical height of the fourth partition turning grating or the fifth partition turning grating on the waveguide matrix.

[0109] It should be noted that, in the binocular display diffraction light waveguide device of the present invention, when the other areas of the first turning grating except the first set area adopt the two-dimensional grating, and the other areas of the second turning grating except the second set area adopt the two-dimensional grating, Fig. 9 As shown, the two-dimensional gratings used in other areas of the first turning grating except the first set area can have the same grating structure as the two-dimensional grating of the first set area of ​​the first turning grating, and the two-dimensional gratings used in other areas of the second turning grating except the second set area can have the same grating structure as the two-dimensional grating of the second set area of ​​the second turning grating.

[0110] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art can still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A binocular display diffraction light waveguide device, characterized in that: It comprises a waveguide substrate and a grating structure arranged on the waveguide substrate, wherein the grating structure comprises an in-coupling grating, a first turning grating, a second turning grating, a first out-coupling grating and a second out-coupling grating; The first setting area of ​​the first turning grating is a two-dimensional grating, and the other areas of the first turning grating except the first setting area adopt one-dimensional grating or two-dimensional grating, the second setting area of ​​the second turning grating is a two-dimensional grating, and the other areas of the second turning grating except the second setting area adopt one-dimensional grating or two-dimensional grating; The eye box position corresponding to the left eye of a person can be adjusted by changing the arrangement of the first turning grating in the waveguide matrix, and the eye box position corresponding to the right eye of a person can be adjusted by changing the arrangement of the second turning grating in the waveguide matrix.

2. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The incident light beam is divided into a first diffraction light beam and a second diffraction light beam by the diffraction effect of the coupling-in grating, and propagates through total reflection in the waveguide matrix; the first diffraction light beam propagating through total reflection in the waveguide matrix is ​​transmitted to the first coupling-out grating through the first turning grating, and a part of the first diffraction light beam is coupled out of the person's left eye through the diffraction effect of the first coupling-out grating; the second diffraction light beam propagating through total reflection in the waveguide matrix is ​​transmitted to the second coupling-out grating through the second turning grating, and a part of the second diffraction light beam is coupled out of the person's right eye through the diffraction effect of the second coupling-out grating.

3. The binocular display diffraction light waveguide device according to claim 2, characterized in that: The first set area is a coverage area where the first diffracted light beam propagates through total reflection of the waveguide matrix in the area where the first turning grating is located; The second set area is a coverage area where the second diffracted light beam propagates through total reflection of the waveguide matrix in the area where the second turning grating is located.

4. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The center of the coupling-in grating is arranged on the central axis of the waveguide substrate in the vertical direction, the coupling-in grating is symmetrically arranged about the central axis of the waveguide substrate in the vertical direction, the first turning grating and the second turning grating are symmetrically arranged about the central axis of the waveguide substrate in the vertical direction, and the first outcoupling grating and the second outcoupling grating are symmetrically arranged about the central axis of the waveguide substrate in the vertical direction.

5. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The coupling-in grating is a one-dimensional grating or a two-dimensional grating.

6. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The first outcoupling grating is a one-dimensional grating or a two-dimensional grating, and the second outcoupling grating is a one-dimensional grating or a two-dimensional grating.

7. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The coupling-in grating and the first coupling-out grating have the same grating period, and the coupling-in grating and the first coupling-out grating have the same grating line direction; The coupling-in grating and the second coupling-out grating have the same grating period, and the coupling-in grating and the second coupling-out grating have the same grating line direction.

8. The binocular display diffraction light waveguide device according to claim 1, characterized in that: The first turning grating includes a first sub-area turning grating, a second sub-area turning grating and a third sub-area turning grating; the first sub-area turning grating adopts a two-dimensional grating, the second sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating, and the third sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating; The first sub-area turning grating is arranged in a first set area of ​​the first turning grating, the second sub-area turning grating is arranged closely in an upper area of ​​the first set area, and the third sub-area turning grating is arranged closely in a lower area of ​​the first set area; The second turning grating includes a fourth sub-area turning grating, a fifth sub-area turning grating and a sixth sub-area turning grating; the fourth sub-area turning grating adopts a two-dimensional grating, the fifth sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating, and the sixth sub-area turning grating adopts a one-dimensional grating or a two-dimensional grating; The fourth sub-area turning grating is arranged in the second setting area of ​​the second turning grating, the fifth sub-area turning grating is closely arranged in the upper area of ​​the second setting area, and the sixth sub-area turning grating is closely arranged in the lower area of ​​the second setting area.

9. The binocular display diffraction light waveguide device according to claim 8, characterized in that: The first diffracted light beam propagates by total reflection in the waveguide matrix and enters the first sub-area turning grating, a part of the first diffracted light beam continues to propagate to the first out-coupling grating along the original direction, a part of the first diffracted light beam enters the second sub-area turning grating through the diffraction effect of the grating vector K1 of the first sub-area turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the second sub-area turning grating, and the remaining part of the first diffracted light beam enters the third sub-area turning grating through the diffraction effect of the grating vector K2 of the first sub-area turning grating and is transmitted to the first out-coupling grating through the diffraction effect of the third sub-area turning grating; The second diffraction light beam propagates by total reflection in the waveguide matrix and enters the fourth partition turning grating. A part of the second diffraction light beam continues to propagate along the original direction to the second out-coupling grating. A part of the second diffraction light beam enters the fifth partition turning grating through the diffraction effect of the grating vector K3 of the fourth partition turning grating and is transmitted to the second out-coupling grating through the diffraction effect of the fifth partition turning grating. The remaining part of the second diffraction light beam enters the sixth partition turning grating through the diffraction effect of the grating vector K4 of the fourth partition turning grating and is transmitted to the second out-coupling grating through the diffraction effect of the sixth partition turning grating.

10. The binocular display diffraction light waveguide device according to claim 8, characterized in that: The angle α between the grating vector K1 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is in the range of 30°<α<80°; The angle β between the grating vector K2 direction of the two-dimensional grating of the first subarea turning grating in the first turning grating and the horizontal direction is in the range of -30°<β<-80°; The angle θ between the grating vector K3 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction is in the range of 30°<θ<80°; The angle φ between the grating vector K4 direction of the two-dimensional grating of the fourth sub-area turning grating in the second turning grating and the horizontal direction has a value range of -30°<φ<-80°.

11. The binocular display diffraction light waveguide device according to claim 10, characterized in that: When |α|=|β|, and the partition sizes of the first partition turning grating, the second partition turning grating, and the third partition turning grating in the first turning grating are changed, so that the center position of the eye box corresponding to the left eye of the person and the center position of the coupling grating are located on the same horizontal line; When |α|>|β|, and the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the left eye of the person on the waveguide substrate is greater than the vertical height of the center position of the coupling grating on the waveguide substrate; When |α|<|β|, and the partition sizes of the first partition turning grating, the second partition turning grating and the third partition turning grating in the first turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the left eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

12. The binocular display diffraction light waveguide device according to claim 10, characterized in that: When |θ|=|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating are changed, so that the center position of the eye box corresponding to the right eye of the person and the center position of the coupling grating are located on the same horizontal line; When |θ|>|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the right eye of the person on the waveguide substrate is greater than the vertical height of the center position of the coupling grating on the waveguide substrate; When |θ|<|φ|, and the partition sizes of the fourth partition turning grating, the fifth partition turning grating and the sixth partition turning grating in the second turning grating are changed, so that the vertical height of the center position of the eye box corresponding to the right eye of the human body in the waveguide matrix is ​​smaller than the vertical height of the center position of the coupling grating in the waveguide matrix.

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