Optical waveguide display device

Abstract

The utility model discloses an optical waveguide display device, comprising an image generation unit which comprises a first optical machine and a second optical machine, the first optical machine generates a first image, and the second optical machine generates a second image; the optical waveguide unit comprises a first plane and a second plane, the first plane is provided with a first grating module, and the second plane is provided with a second grating module; the first grating module is provided with a first entrance pupil area, a second entrance pupil area, a first pupil expanding area, a second pupil expanding area and a first exit pupil area. The second grating module is provided with a third entrance pupil area, a fourth entrance pupil area, a third pupil expanding area, a fourth pupil expanding area and a second exit pupil area. According to the embodiment of the utility model, the light rays are incident by adopting the double optical machines, and the optical waveguide units are rotationally and symmetrically arranged, so that the light intensity distribution of the first exit pupil area and the second exit pupil area is more uniform, and the display effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, and particularly relates to a waveguide display device. Background Art

[0002] Diffractive waveguide display technology is a key technology widely used in augmented reality (AR) glasses. It uses the diffraction characteristics of light to design and implement an "optical path" to effectively transmit image information to the human eye and achieve a virtual-real fusion display effect. A diffractive waveguide includes three parts: a coupling input grating, a transparent medium such as a planar glass, and a coupling output grating. The image light generated by an image generation unit irradiates on the coupling input grating. After passing through the coupling input grating, the image light undergoes a diffraction effect and changes its original propagation direction. The light that meets the total reflection condition is transmitted inside the waveguide according to the principle of total internal reflection. When it reaches the coupling output grating, the total reflection condition is broken, and the light is coupled into the viewer's eye.

[0003] However, in the prior art, the diffractive waveguide display device is a single-layer, single-optical-engine, single-entering-pupil waveguide display device, which adopts a double-sided imprinting technology. The diffraction efficiency in the exit pupil region usually remains unchanged. Therefore, as the light transmits in the exit pupil region, the intensity of the light propagating in the original direction inside the waveguide decreases, resulting in a change in the intensity of the diffracted output light in the exit pupil region with the change of the regional spatial position, and the intensity distribution of the output light along the vertical direction of the exit pupil region is uneven. At the same time, the diffraction efficiencies of the two superimposed gratings in the entrance pupil region are the same, which will lead to inconsistent light energy transmitted from the entrance pupil region to the expanding pupil regions on both sides, resulting in uneven display brightness on both sides of the exit pupil region and further affecting the display effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a waveguide display device, aiming to solve the problem of uneven output light in the exit pupil region caused by the design of the waveguide in the prior art.

[0005] The utility model provides a waveguide display device, which comprises:

[0006] An image generation unit, the image generation unit includes a first optical engine and a second optical engine, the first optical engine generates a first image, and the second optical engine generates a second image;

[0007] A waveguide unit, the waveguide unit includes a first plane and a second plane, a first grating module is arranged on the first plane, and a second grating module is arranged on the second plane; a first entrance pupil region, a second entrance pupil region, a first expanding pupil region, a second expanding pupil region, and a first exit pupil region are arranged on the first grating module, and a third entrance pupil region, a fourth entrance pupil region, a third expanding pupil region, a fourth expanding pupil region, and a second exit pupil region are arranged on the second grating module;

[0008] Among them, the first entrance pupil region and the third entrance pupil region are coupled to input the first image; the second entrance pupil region and the fourth entrance pupil region are coupled to input the second image.

[0009] Optionally, the grating period on the first grating module is the same as the grating period on the second grating module.

[0010] Optionally, the projections of the first entrance pupil region and the third entrance pupil region in the thickness direction of the optical waveguide unit at least partially overlap, and the first entrance pupil region and the third entrance pupil region together form a first entrance pupil unit; the projections of the second entrance pupil region and the fourth entrance pupil region in the thickness direction of the optical waveguide unit at least partially overlap, and the second entrance pupil region and the fourth entrance pupil region together form a second entrance pupil unit.

[0011] Optionally, the projections of the first exit pupil region and the second exit pupil region in the thickness direction of the optical waveguide unit at least partially overlap, and the first exit pupil region and the second exit pupil region together form an exit pupil unit.

[0012] Optionally, the first entrance pupil unit corresponds to a first optical engine, and the second entrance pupil unit corresponds to a second optical engine;

[0013] The first entrance pupil region forms a first conductive light that travels to the third pupil expansion region, and the third entrance pupil region forms a third conductive light that travels to the first pupil expansion region; the second entrance pupil region forms a second conductive light that travels to the fourth pupil expansion region, and the fourth entrance pupil region forms a fourth conductive light that travels to the second pupil expansion region.

[0014] Optionally, the first conductive light travels to the exit pupil unit to form a first output conductive light, the second conductive light travels to the exit pupil unit to form a second output conductive light, and the first output conductive light and the second output conductive light propagate in opposite directions in the exit pupil unit; the third conductive light travels to the exit pupil unit to form a third output conductive light, the fourth conductive light travels to the exit pupil unit to form a fourth output conductive light, and the third output conductive light and the fourth output conductive light propagate in opposite directions in the exit pupil unit.

[0015] Optionally, the first entrance pupil region and the third entrance pupil region are provided with a first coupled input grating and a second coupled input grating, which are respectively located in the first plane and the second plane; the second entrance pupil region and the fourth entrance pupil region are provided with a third coupled input grating and a fourth coupled input grating, which are respectively located in the first plane and the second plane.

[0016] Optionally, the first pupil expansion region and the third pupil expansion region are both provided with a first turning grating, which are respectively located on the first plane and the second plane; the second pupil expansion region and the fourth pupil expansion region are both provided with a second turning grating, which are respectively located on the first plane and the second plane.

[0017] Optionally, the first optical engine and the second optical engine are located on the same side or different sides of the optical waveguide unit, and the first optical engine and the second optical engine are centrosymmetric with respect to the optical waveguide unit.

[0018] Optionally, the first image and the second image are the same or axially symmetric or rotationally symmetric.

[0019] The utility model discloses an optical waveguide display device, which includes an image generation unit and an optical waveguide unit; the image generation unit is used to generate a first image and a second image; further, the optical waveguide unit includes a first plane and a second plane, the first plane is provided with a first grating module, the second plane is provided with a second grating module, the first grating module is provided with a first entrance pupil region, a second entrance pupil region, a first pupil expansion region, a second pupil expansion region and a first exit pupil region, the second grating module is provided with a third entrance pupil region, a fourth entrance pupil region, a third pupil expansion region, a fourth pupil expansion region and a second exit pupil region, wherein, the first grating module and the second grating module are in a rotationally symmetric structure. By adopting double optical engines to incident light and arranging the optical waveguide unit in a rotationally symmetric manner, the light intensity distribution after the superposition of the first exit pupil region and the second exit pupil region is more uniform, and the display effect is further improved in the embodiment of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the optical waveguide display device provided by the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the first plane provided by the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the second plane provided by the present utility model;

[0024] Figure 4 It is a top view of the double-sided optical waveguide unit provided by the present utility model;

[0025] Figure 5Schematic diagram of diffracted light transmitted in the optical waveguide unit provided by the present utility model;

[0026] Figure 6 Schematic structural diagram of light transmitted in the optical waveguide unit provided by the present utility model;

[0027] Figure 7 Schematic diagram of the grating vector structure of the optical waveguide unit provided by the present utility model;

[0028] Figure 8 Schematic diagram of the grating vector structure of the first plane provided by the present utility model;

[0029] Figure 9 Schematic diagram of the light intensity of the first output conduction light and the second output conduction light at the same position in the exit pupil unit and the light intensity after superposition provided by the present utility model;

[0030] Figure 10 Grating wave vector diagram of the optical waveguide provided by the present utility model.

[0031] Explanation of the markings in the figure:

[0032] 1. Image generation unit; 11. First optical machine; 111. First image; 12. Second optical machine; 121. Second image;

[0033] 2. Optical waveguide unit; 21. First plane; 211. First grating module; 2111. First entrance pupil area; 21111. First conduction light; 2112. Second entrance pupil area; 21121. Second conduction light; 2113. First pupil expansion area; 2114. Second pupil expansion area; 2115. First exit pupil area; 22. Second plane; 221. Second grating module; 2211. Third entrance pupil area; 22111. Third conduction light; 2212. Fourth entrance pupil area; 22121. Fourth conduction light; 2213. Third pupil expansion area; 2214. Fourth pupil expansion area; 2215. Second exit pupil area; 23. First entrance pupil unit; 24. Second entrance pupil unit; 25. Exit pupil unit; 251. First output conduction light; 252. Second output conduction light. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0036] It should also be understood that the terms used in this specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in this specification of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0037] It should be further understood that the term "and / or" used in this specification of the present utility model and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0038] In the prior art, in the exit pupil region, as light is output, the optical energy transmitted in the original optical waveguide gradually decreases. If the diffraction efficiency of the entire exit pupil region remains unchanged, then in the subsequent region, as the transmission distance increases, the energy of the output light gradually decreases, resulting in non-uniform light intensity of the output light in the Z direction and affecting the display effect.

[0039] To solve the problem of inconsistent optical energy, the existing solution is to change the grating structure of the third entrance pupil region 2211 and the fourth entrance pupil region 2212 of the second plane 22 so as to change its diffraction efficiency, making the optical energy transmitted from the entrance pupil region to the expanding pupil region consistent. However, this means that two master templates need to be used for imprinting, reducing the production speed of the optical waveguide unit 2 and increasing the production cost of the optical waveguide unit 2.

[0040] Therefore, the embodiment of the present utility model adopts a rotationally symmetric design of the optical waveguide unit 2 and uses a dual optical engine (the first optical engine 11 and the second optical engine 12) system. In the first exit pupil region 2115 and the second exit pupil region 2215, light from two optical engines enters the entrance pupil region for transmission from symmetric directions, achieving the effect of uniform light intensity output in the exit pupil region and further improving the display effect. The following is a detailed description of each embodiment.

[0041] Please refer to Figures 1 to 4, an embodiment of the present utility model provides an optical waveguide display device, including: an image generation unit 1, the image generation unit 1 includes a first optical engine 11 and a second optical engine 12, the first optical engine 11 generates a first image 111, and the second optical engine 12 generates a second image 121; an optical waveguide unit 2, the optical waveguide unit 2 includes a first plane 21 and a second plane 22, a first grating module 211 is arranged on the first plane 21, and a second grating module 221 is arranged on the second plane 22; a first entrance pupil area 2111, a second entrance pupil area 2112, a first pupil expansion area 2113, a second pupil expansion area 2114 and a first exit pupil area 2115 are arranged on the first grating module 211, and a third entrance pupil area 2211, a fourth entrance pupil area 2212, a third pupil expansion area 2213, a fourth pupil expansion area 2214 and a second exit pupil area 2215 are arranged on the second grating module 221; wherein, the first grating module 211 and the second grating module 221 are in a rotationally symmetric structure, and the first entrance pupil area 2111 and the third entrance pupil area 2211 are coupled to input the first image 111; the second entrance pupil area 2112 and the fourth entrance pupil area 2212 are coupled to input the second image 121.

[0042] In this embodiment, the first image 111 and the second image 121 are the same or axially symmetric or rotationally symmetric.

[0043] Specifically, by setting two optical engines, namely the first optical engine 11 and the second optical engine 12, as the image generation unit 1, the optical waveguide display device can process and display two sets of image information simultaneously. The first grating module 211 and the second grating module 221 are in a rotationally symmetric structure. This design enables the first image 111 and the second image 121 generated by the two optical engines to maintain relative rotational symmetry during transmission. When the first image 111 and the second image 121 are superimposed in the exit pupil area, due to the rotational symmetry of the first grating module 211 and the second grating module 221, the effect of uniform light intensity output in the exit pupil area is achieved, further improving the display effect.

[0044] Specifically, both the first grating module 211 and the second grating module 221 are formed by nanoimprinting technology on the first plane 21 and the second plane 22 respectively. The current nanoimprinting technology generally consists of three steps. The first step is the processing of the template. Generally, means such as electron beam lithography are used to process the required structure on a silicon or other substrate as the template. The second step is the transfer of the pattern. A imprinting resist is coated on the surface of the material to be processed, and then the template is pressed on its surface. The pattern is transferred to the imprinting resist by applying pressure. The third step is the processing of the substrate. The imprinting resist is cured by ultraviolet light irradiation or heating, etc. After removing the template, the nanoimprinting resist pattern is transferred to the substrate by etching process to finally obtain the required structure. Double-sided imprinting is to perform imprinting treatment on both the first plane 21 and the second plane 22 to obtain the required structure. In this embodiment, double-sided imprinting is performed, and the first plane 21 and the second plane 22 after imprinting are respectively as Figure 3 and Figure 4 shown.

[0045] It should be noted that in actual operation, there may be differences in the imprinting technology, and the imprinting technology used on different grating modules is not restricted.

[0046] Furthermore, the grating period on the first grating module 211 is the same as that on the second grating module 221. In this embodiment, using the same grating period means that the first grating module 211 and the second grating module 221 can adopt the same parameters and process flows in the design and processing process, and gratings of the same specification can be mass-produced. This not only simplifies the design process, but also reduces the processing cost and improves the production efficiency.

[0047] Even further, the grating period is one of the key factors affecting the light diffraction characteristics. When the grating periods of the first grating module 211 and the second grating module 221 are the same, their diffraction effects on light will be consistent, which helps to ensure that the first image 111 and the second image 121 generated by the first optical machine 11 and the second optical machine 12 have similar optical properties during transmission, so that it is easier to achieve the symmetric superposition of the images and the effect of uniform light intensity output in the exit pupil region.

[0048] Such as Figure 5As shown in the figure, when the first image 111 generated by the image generation unit 1 enters the first pupil unit 23 from the first plane 21 of the optical waveguide unit, it first contacts the first pupil region 2111 and the second pupil region 2112 of the first plane 21. A part of the image is diffracted by the input gratings of the first pupil region 2111 and the third pupil region 2211 to form +1 order (or -1 order) diffracted light and is transmitted in the optical waveguide unit 2 in a total reflection manner towards the first pupil expansion region 2113 and the second pupil expansion region 2114 of the first plane 21. Another part of the image is 0 order diffracted light and continues to be transmitted in the original direction (the direction of the input first image 111) to the third pupil region 2211 and the fourth pupil region 2212 of the second plane 22 and is diffracted to form -1 order (or +1 order) diffracted light, and is transmitted in the waveguide in a total reflection manner towards the third pupil expansion region 2213 and the fourth pupil expansion region 2214 of the second plane 22. Therefore, the diffracted light energies transmitted in the left and right directions formed by the coupling input gratings of the first plane 21 and the second plane 22 are not the same, which will result in different light energies transmitted in the first pupil expansion region 2113, the second pupil expansion region 2114, the third pupil expansion region 2213, and the fourth pupil expansion region 2214, and further result in inconsistent display brightness on the left and right sides of the first exit pupil region 2115 and the second exit pupil region 2215.

[0049] Therefore, to solve the problem of uneven light intensity on the left and right, as Figure 2 and Figure 3 shown, the first pupil region 2111 and the third pupil region 2211 are provided with a first coupling input grating and a second coupling input grating, which are respectively located on the first plane 21 and the second plane 22; the second pupil region 2112 and the fourth pupil region 2212 are provided with a third coupling input grating and a fourth coupling input grating, which are respectively located on the first plane 21 and the second plane 22.

[0050] The first pupil expansion region 2113 and the third pupil expansion region 2213 are both provided with a first turning grating, which are respectively located on the first plane 21 and the second plane 22; the second pupil expansion region 2114 and the fourth pupil expansion region 2214 are both provided with a second turning grating, which are respectively located on the first plane 21 and the second plane 22.

[0051] Furthermore, as Figure 6 shown, the projections of the first pupil region 2111 and the third pupil region 2211 in the thickness direction of the optical waveguide unit 2 at least partially overlap, and the first pupil region 2111 and the third pupil region 2211 together constitute the first pupil unit 23; the projections of the second pupil region 2112 and the fourth pupil region 2212 in the thickness direction of the optical waveguide unit 2 at least partially overlap, and the second pupil region 2112 and the fourth pupil region 2212 together constitute the second pupil unit 24.

[0052] The projections of the first exit pupil region 2115 and the second exit pupil region 2215 in the thickness direction of the optical waveguide unit 2 at least partially overlap, and the first exit pupil region 2115 and the second exit pupil region 2215 together form the exit pupil unit 25.

[0053] In this embodiment, as Figure 7 and Figure 8 shown, (I-E 1) and (I-E 2) respectively represent the first entrance pupil unit 23 and the second entrance pupil unit 24. (I-E 1) can also represent the first coupled input grating and the second coupled input grating (i.e., the coupled input grating (I-E)). The grating vectors of the first coupled input grating and the second coupled input grating are respectively k 11 、k 12 ; (I-E2) can also represent the third coupled input grating and the fourth coupled input grating (i.e., the coupled input grating (I-E)). The grating vectors of the third coupled input grating and the fourth coupled input grating are respectively k 41 、k 42 .

[0054] (R-E 1), (R-E 2), (R-E 3), (R-E 4) are respectively the first pupil expansion region 2113, the second pupil expansion region 2114, the third pupil expansion region 2213, and the fourth pupil expansion region 2214. (R-E 1) and (R-E 3) can also be represented as the first turning grating (i.e., the turning grating (R-E)). The two grating vectors are respectively k 21 、k 22 ; (R-E 2) and (R-E4) can also be represented as the second turning grating (i.e., the turning grating (R-E)). The two grating vectors are respectively k 52 、k 51 . (O-E) is the exit pupil unit 25. (O-E) can also represent the first coupled output grating and the second coupled output grating. The first coupled input grating has a grating vector k 31 , and at the same time, there can be a grating vector k 61 . The second coupled input grating has a grating vector k 32 , and at the same time, there can be a grating vector k 62 .

[0055] The grating vector is determined by the vector magnitude and direction v. d is the grating period, and the vector direction v is defined as the direction perpendicular to the grating lines. Among them, (I-E1) has a grating vector k1, the turning gratings (R-E1) and (R-E3) have a grating vector k2, and the first coupled output grating (O-E) has a grating vector k3. Correspondingly, (I-E2) has a grating vector k4, the turning gratings (R-E2) and (R-E4) have a grating vector k5, and the second coupled output grating (O-E) has a grating vector k6. They share the same coupled output grating (O-E). Since the embodiment of the present utility model adopts the single-period grating design mentioned above, the magnitudes of k1, k2, k3, k4, k5, and k6 are equal, and the directions are the same or opposite.

[0056] Further, as Figure 6 shown, the first entrance pupil unit 23 corresponds to the first optical engine 11, and the second entrance pupil unit 24 corresponds to the second optical engine 12; the first entrance pupil region 2111 forms the first conduction light 21111 that is transmitted to the third pupil expansion region 2213, and the third entrance pupil region 2211 forms the third conduction light 22111 that is transmitted to the first pupil expansion region 2113; the second entrance pupil region 2112 forms the second conduction light 21121 that is transmitted to the fourth pupil expansion region 2214, and the fourth entrance pupil region 2212 forms the fourth conduction light 22121 that is transmitted to the second pupil expansion region 2114.

[0057] The first conduction light 21111 is transmitted to the exit pupil unit 25 to form the first output conduction light 251, and the second conduction light 21121 is transmitted to the exit pupil unit 25 to form the second output conduction light 252. The first output conduction light 251 and the second output conduction light 252 propagate towards each other in the exit pupil unit 25; the third conduction light 22111 is transmitted to the exit pupil unit 25 to form the third output conduction light, and the fourth conduction light 22121 is transmitted to the exit pupil unit 25 to form the fourth output conduction light. The third output conduction light and the fourth output conduction light propagate towards each other in the exit pupil unit 25.

[0058] In this embodiment, the light intensities of the first output conduction light 251 and the second output conduction light 252 at the same position in the exit pupil unit 25 and the intensity after superposition are as Figure 9 shown.

[0059] Furthermore, the first optical engine 11 and the second optical engine 12 are located on the same side or different sides of the optical waveguide unit 2, and the first optical engine 11 and the second optical engine 12 are centrosymmetric about the center of the optical waveguide unit 2. In this embodiment, if the first optical engine 11 and the second optical engine 12 are on the same side of the optical waveguide unit 2, the first image 111 and the second image 121 generated by the first optical engine 11 and the second optical engine 12 are axially symmetric, so that the first image 111 and the second image 121 can be the same in the image output by the exit pupil unit 25. If the first optical engine 11 and the second optical engine 12 are on different sides of the optical waveguide unit 2, the first image 111 and the second image 121 generated by the first optical engine 11 and the second optical engine 12 are rotationally symmetric about the center, and the two images are also the same in the image output in the exit pupil area.

[0060] As Figure 10 shown, it is the waveguide mode of the grating distribution in this embodiment. The small circle BND1 represents the first boundary for satisfying the total internal reflection standard in the optical waveguide, and the large circle BND2 represents the second boundary of the maximum wave vector in the optical waveguide. The wave vector boundary can be determined by the refractive index of the waveguide. Only when the wave vector of the light is in the region ZONE1 between the first boundary BND1 and the second boundary BND2, the light can propagate in the waveguide. If the wave vector of the light is outside the region ZONE1, the light may leak out of the waveguide plate or not propagate at all. The specific waveguide process is as follows:

[0061] For the first optical engine 11, the incident light IN1 enters the waveguide from the region BOX0a and conducts to the left and right sides respectively in the grating directions V11 and V12. The wave vector of the first left-conducting light B1a is in the region BOX1a, and the wave vector of the first right-conducting light B1b is in the region BOX1b. The second left-conducting light B2a conducts downward in the grating direction V22, and its wave vector region is in BOX2a; the second right-conducting light B2b conducts downward in the grating direction V21, and its wave vector region is in BOX2b. The third left-conducting light B3a conducts in the V32 direction, and its wave vector is in BOX3a; the third right-conducting light B3b conducts in the V31 direction, and its wave vector is in BOX3b. The first left output light OUT1 conducts in the V31 direction, and its wave vector region is in BOX4a; the first right output light OUT2 conducts in the V32 direction, and its wave vector region is in BOX4b. According to the waveguide theory, the paths of the two wave vectors in the waveguide need to be closed loops to ensure the symmetric relationship between the waveguide input and output.

[0062] Similarly, for the second optical engine 12, similar to the first optical engine 11, it is centrosymmetric. The incident light IN2 enters the waveguide from the region BOX0b and propagates to both sides in the grating directions V41 and V42 respectively. Among them, the wave vector of the first right-conducting light B4a is in the region BOX5a, and the wave vector of the first left-conducting light B4b is in the region BOX5b. The second right-conducting light B5a conducts downward in the grating direction V52, and its wave vector region is in BOX6a; the second left-conducting light B2b conducts downward in the grating direction V51, and its wave vector region is in BOX6b. The third right-conducting light B6a conducts in the V62 direction, and its wave vector is in BOX7a; the third left-conducting light B6b conducts in the V61 direction, and its wave vector is in BOX7b. The first right-output light OUT3 conducts in the V61 direction, and its wave vector region is in BOX8a; the first left-output light OUT4 conducts in the V62 direction, and its wave vector region is in BOX8b. According to waveguide theory, the paths of the two wave vectors in the waveguide need to be closed loops to ensure the symmetry relationship between waveguide input and output.

[0063] The various embodiments in the specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For related parts, reference can be made to the description in the method section. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0064] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion.

[0065] Inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

Claims

1. An optical waveguide display device, characterized in that: include: An image generating unit, the image generating unit comprising a first optical machine and a second optical machine, the first optical machine generates a first image, and the second optical machine generates a second image; An optical waveguide unit, the optical waveguide unit comprising a first plane and a second plane, the first plane being provided with a first grating module, the second plane being provided with a second grating module; the first grating module being provided with a first entrance pupil area, a second entrance pupil area, a first expanded pupil area, a second expanded pupil area and a first exit pupil area, the second grating module being provided with a third entrance pupil area, a fourth entrance pupil area, a third expanded pupil area, a fourth expanded pupil area and a second exit pupil area; The first entrance pupil area and the third entrance pupil area are coupled to input the first image; the second entrance pupil area and the fourth entrance pupil area are coupled to input the second image.

2. The optical waveguide display device according to claim 1, characterized in that: The grating period on the first grating module is the same as the grating period on the second grating module.

3. The optical waveguide display device according to claim 1, characterized in that: The projections of the first entrance pupil area and the third entrance pupil area in the thickness direction of the optical waveguide unit at least partially overlap, and the first entrance pupil area and the third entrance pupil area together constitute a first entrance pupil unit; the projections of the second entrance pupil area and the fourth entrance pupil area in the thickness direction of the optical waveguide unit at least partially overlap, and the second entrance pupil area and the fourth entrance pupil area together constitute a second entrance pupil unit.

4. The optical waveguide display device according to claim 3, characterized in that: Projections of the first exit pupil area and the second exit pupil area in the thickness direction of the optical waveguide unit at least partially overlap, and the first exit pupil area and the second exit pupil area together constitute an exit pupil unit.

5. The optical waveguide display device according to claim 4, characterized in that: The first entrance pupil unit corresponds to a first optical machine, and the second entrance pupil unit corresponds to a second optical machine; The first entrance pupil area forms a first transmission light transmitted to the third pupil area, and the third entrance pupil area forms a third transmission light transmitted to the first pupil area; the second entrance pupil area forms a second transmission light transmitted to the fourth pupil area, and the fourth entrance pupil area forms a fourth transmission light transmitted to the second pupil area.

6. The optical waveguide display device according to claim 5, characterized in that: The first transmission light is transmitted to the exit pupil unit to form a first output transmission light, the second transmission light is transmitted to the exit pupil unit to form a second output transmission light, and the first output transmission light and the second output transmission light propagate towards each other in the exit pupil unit; the third transmission light is transmitted to the exit pupil unit to form a third output transmission light, and the fourth transmission light is transmitted to the exit pupil unit to form a fourth output transmission light, and the third output transmission light and the fourth output transmission light propagate towards each other in the exit pupil unit.

7. The optical waveguide display device according to claim 1, characterized in that: The first entrance pupil area and the third entrance pupil area are provided with a first coupling input grating and a second coupling input grating, which are respectively located in the first plane and the second plane; the second entrance pupil area and the fourth entrance pupil area are provided with a third coupling input grating and a fourth coupling input grating, which are respectively located in the first plane and the second plane.

8. The optical waveguide display device according to claim 1, characterized in that: The first pupil expansion area and the third pupil expansion area are both provided with a first turning grating, which is respectively located in the first plane and the second plane; the second pupil expansion area and the fourth pupil expansion area are both provided with a second turning grating, which is respectively located in the first plane and the second plane.

9. The optical waveguide display device according to claim 1, characterized in that: The first optical engine and the second optical engine are located at the same side or different sides of the optical waveguide unit, and the first optical engine and the second optical engine are centrally symmetrical about the optical waveguide unit.

10. The optical waveguide display device according to claim 1, characterized in that The first image and the second image are identical or axially symmetric or rotationally symmetric.

Images