A monocular augmented reality system, a binocular augmented reality system and a head-mounted display

Abstract

Embodiments of the present invention provide a monocular augmented reality system, a binocular augmented reality system, and a head-mounted display. The monocular augmented reality display system includes: a first microdisplay for generating a first light beam; a second microdisplay for generating a second light beam; a waveguide substrate including a first coupling-out structure and a second coupling-out structure. After the first light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the first coupling-out structure to form a first outgoing field-of-view light; after the second light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the second coupling-out structure to form a second outgoing field-of-view light. The first outgoing field-of-view light and the second outgoing field-of-view light are located on the same side of the waveguide substrate, and the propagation direction of the first outgoing field-of-view light intersects with the propagation direction of the second outgoing field-of-view light. Embodiments of the present invention provide a monocular augmented reality system, a binocular augmented reality system, and a head-mounted display to achieve an enlarged field of view.

Description

Technical Field

[0001] The present invention relates to augmented reality display technology, and in particular to a monocular augmented reality system, a binocular augmented reality system, and a head-mounted display. Background Art

[0002] The head-mounted display for augmented reality adopts near-eye display technology, which allows people to view the virtual images being projected while looking at the surrounding environment. The virtual images are superimposed on the real world perceived by the user, creating a more realistic experience and a stronger sense of immersion for the user.

[0003] In the process of implementing the embodiments of the present invention, the inventors found that most of the above-related technologies are Birdbath, prism, free-form surface, optical waveguide and other technologies. In the first three solutions, there are contradictions between increasing the field of view angle and reducing the volume; to solve this problem, researchers proposed the optical waveguide solution, but in the array optical waveguide solution, the field of view angle of the AR display system is generally small, and the largest known device field of view angle is about 42°. Summary of the Invention

[0004] Embodiments of the present invention provide a monocular augmented reality system, a binocular augmented reality system, and a head-mounted display to achieve an enlarged field of view angle.

[0005] In a first aspect, an embodiment of the present invention provides a monocular augmented reality display system, including:

[0006] A first microdisplay screen for generating a first light beam;

[0007] A second microdisplay screen for generating a second light beam;

[0008] A waveguide substrate including a first coupling-out structure and a second coupling-out structure. After the first light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the first coupling-out structure to form a first outgoing field-of-view light; after the second light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the second coupling-out structure to form a second outgoing field-of-view light;

[0009] The first outgoing field-of-view light and the second outgoing field-of-view light are on the same side of the waveguide substrate, and the propagation direction of the first outgoing field-of-view light intersects with the propagation direction of the second outgoing field-of-view light.

[0010] Optionally, the waveguide substrate includes a first surface and a second surface, and the first surface and the second surface are opposite and parallel to each other;

[0011] The included angle between the first coupling-out structure and the first surface is greater than or equal to 19.7° and less than or equal to 25.5°;

[0012] The included angle between the second output structure and the first surface is greater than or equal to 19.7° and less than or equal to 25.5°.

[0013] Optionally, the included angle between the first output structure and the first surface is greater than or equal to 19.7° and less than or equal to 20.5°;

[0014] The included angle between the second output structure and the first surface is greater than or equal to 19.7° and less than or equal to 20.5°.

[0015] Optionally, a first polarization device is further included, and the first polarization device is located between the first micro display screen and the waveguide substrate for making the first light beam have a first polarization direction;

[0016] A second polarization device is further included, and the second polarization device is located between the second micro display screen and the waveguide substrate for making the second light beam have a second polarization direction;

[0017] The first polarization direction is perpendicular to the second polarization direction.

[0018] Optionally, the first micro display screen, the second micro display screen, the first outgoing field light, and the second outgoing field light are located on the same side of the waveguide substrate.

[0019] Optionally, a first imaging element is further included, and the first imaging element is located between the first micro display screen and the waveguide substrate;

[0020] A second imaging element is further included, and the second imaging element is located between the second micro display screen and the waveguide substrate.

[0021] Optionally, the refractive index of the waveguide substrate is less than or equal to 1.56.

[0022] Optionally, a first coating layer is further included, and the first coating layer is located on the surface of the first output structure away from the first micro display screen;

[0023] A second coating layer is further included, and the second coating layer is located on the surface of the second output structure away from the second micro display screen.

[0024] In a second aspect, an embodiment of the present invention provides a binocular augmented reality display system, including two monocular augmented reality display systems as described in the first aspect.

[0025] In a third aspect, an embodiment of the present invention provides a head-mounted display, including the monocular augmented reality display system as described in the first aspect or the binocular augmented reality display system as described in the second aspect.

[0026] In the monocular augmented reality display system provided by an embodiment of the present invention, a waveguide substrate, a first micro display screen, and a second micro display screen are included. The first light beam emitted by the first micro display screen and the second light beam emitted by the second micro display screen are both projected onto the same waveguide substrate. The first light beam is coupled out of the waveguide substrate by a first coupling structure to form a first outgoing field-of-view light, and the propagation space of the first outgoing field-of-view light constitutes the left field of view. The second light beam is coupled out of the waveguide substrate by a second coupling structure to form a second outgoing field-of-view light, and the propagation space of the second outgoing field-of-view light constitutes the right field of view. The propagation direction of the first outgoing field-of-view light intersects with the propagation direction of the second outgoing field-of-view light. Thus, the propagation directions of the first outgoing field-of-view light and the second outgoing field-of-view light are light beams propagating in two different directions, enabling the left field of view and the right field of view to form the entire monocular field of view by splicing, thereby expanding the field of view angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a monocular augmented reality display system provided by an embodiment of the present invention;

[0028] Figure 2 is Figure 1 a partial structural schematic diagram of the waveguide substrate in;

[0029] Figure 3 is a schematic diagram of the light propagation in the waveguide substrate provided by an embodiment of the present invention;

[0030] Figure 4 is another schematic diagram of the light propagation in the waveguide substrate provided by an embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of the coupled-out light propagation in the waveguide substrate provided by an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of the field of view of a monocular augmented reality display system provided by an embodiment of the present invention;

[0033] Figure 7 is a schematic diagram of a binocular augmented reality display system provided by an embodiment of the present invention;

[0034] Figure 8 is a schematic diagram of a head-mounted display provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings rather than all structures.

[0036] Figure 1 Schematic diagram of a monocular augmented reality display system provided by an embodiment of the present invention Figure 2 is Figure 1 partial structural schematic diagram of a mid-waveguide substrate, refer to Figure 1 and Figure 2 , the monocular augmented reality display system includes a first micro display screen 11, a second micro display screen 12 and a waveguide substrate 10. Among them, the first micro display screen 11 is used to generate a first light beam L1. The second micro display screen 12 is used to generate a second light beam L2. The first micro display screen 11 and the second micro display screen 12 can be active light-emitting image displays such as OLED (organic light-emitting diode) displays, or passive light-emitting image displays such as LCOS (Liquid Crystal on Silicon) displays or LCD liquid crystal displays. The waveguide substrate 10 includes a first coupling-out structure 41 and a second coupling-out structure 42. After the first light beam L1 is projected onto the waveguide substrate 10, it is coupled out of the waveguide substrate 10 by the first coupling-out structure 41 to form a first output field light L3. That is to say, the first coupling-out structure 41 is used to couple the first light beam L1 out of the waveguide substrate 10 and form the first output field light L3. Similarly, after the second light beam L2 is projected onto the waveguide substrate 10, it is coupled out of the waveguide substrate 10 by the second coupling-out structure 42 to form a second output field light L4. That is to say, the second coupling-out structure 42 is used to couple the second light beam L2 out of the waveguide substrate 10 and form the second output field light L4. The first output field light L3 and the second output field light L4 are located on the same side of the waveguide substrate 10, and the propagation direction of the first output field light L3 intersects with the propagation direction of the second output field light L4.

[0037] In the monocular augmented reality display system provided by an embodiment of the present invention, it includes a waveguide substrate 10, a first micro display screen 11, and a second micro display screen 12. The first light beam L1 emitted by the first micro display screen 11 and the second light beam L2 emitted by the second micro display screen 12 are both projected into the same waveguide substrate 10. The first light beam L1 is coupled out of the waveguide substrate 10 by a first coupling structure 41 to form a first output field light L3, and the propagation space of the first output field light L3 constitutes the left field of view. The second light beam L2 is coupled out of the waveguide substrate 10 by a second coupling structure 42 to form a second output field light L4, and the propagation space of the second output field light L4 constitutes the right field of view. The propagation direction of the first output field light L3 intersects with the propagation direction of the second output field light L4. Thus, the propagation directions of the first output field light L3 and the second output field light L4 are light beams propagating in two different directions, enabling the left field of view and the right field of view to form the entire monocular field of view by splicing, thereby expanding the field of view angle. It should be further noted that since the first light beam L1 emitted by the first micro display screen 11 and the second light beam L2 emitted by the second micro display screen 12 are both projected into the same waveguide substrate 10, the brightness of the first micro display screen 11 and the second micro display screen 12 can be made the same or similar, reducing the difficulty of adjusting the brightness of the first micro display screen 11 and the second micro display screen 12. Moreover, by using only one waveguide substrate 10, compared with using multiple waveguide substrates, the number of waveguide substrates 10 used in the monocular augmented reality display system is reduced, and the thickness of the monocular augmented reality display system is thinned, which is conducive to the miniaturization of the monocular augmented reality display system.

[0038] Figure 3 It is a schematic diagram of the light propagation in the waveguide substrate provided by an embodiment of the present invention. Figure 4 It is another schematic diagram of the light propagation in the waveguide substrate provided by an embodiment of the present invention. With reference to Figures 1-4 , the waveguide substrate 10 includes a first surface 101 and a second surface 102, and the first surface 101 and the second surface 102 are opposite and parallel to each other. The angle between the first coupling structure 41 and the first surface 101 is θ1, and the angle between the second coupling structure 42 and the first surface 101 is θ2. Figure 3 and Figure 4 Taking the angle θ2 between the second coupling structure 42 and the first surface 101 as an example in Figure 3 , the influence of the selection of the angle between the second coupling structure 42 and the first surface 101 on imaging is explained (the setting of the angle θ1 between the first coupling structure 41 and the first surface 101 is similar to θ2). With reference to Figure 3 , taking the waveguide substrate 10 including two second coupling structures 42 as an example, but not limited thereto. In other embodiments, the waveguide substrate 10 may also include other numbers of second coupling structures 42. The incident angle is α in-0When the collimated light is coupled out of the waveguide substrate 10 by the second coupling-out structure 42, the outgoing direction is perpendicular to the second surface 102 of the waveguide substrate 10. If the refractive index of the waveguide substrate 10 is n, the total reflection critical angle of the waveguide substrate 10 is α c , satisfying:

[0039]

[0040] The incident light in the waveguide substrate 10 refers to the light incident on the first surface 101 or the second surface 102, as long as the incident light satisfies the condition of total reflection on the first surface 101 and the second surface 102. Therefore, there is an angular fluctuation range for the light incident on the first surface 101 or the second surface 102, that is, the maximum divergence angle FOVmax of the transmissible incident light, and FOVmax satisfies:

[0041] FOV max = 90° - θ min (1.2)

[0042] where θ min is the minimum value of the angle between the second coupling-out structure 42 and the first surface 101.

[0043] However, the actual maximum transmissible divergence angle FOVmax in the waveguide substrate 10 is much smaller than the ideal case calculated by the above formula (1.2), because there will be Figure 4 as shown in. Referring to Figure 4 , for the collimated light with an incident angle α1, there are two outgoing lights in the transmission process. Since the collimated lights with different incident angles enter the human eye and form images at different positions on the retina, the human eye will observe the images transmitted by the collimated light with an incident angle α1 at different positions. One of the images is the "main image", which is the image that the augmented reality display system hopes to display, and the other can be called the "ghost image". For the collimated light with an incident angle α1, the light in the outgoing direction K1 is the source of the main image, and the light in the outgoing direction K2 is the source of the ghost image. The outgoing direction of the collimated light with an incident angle α1 that generates the ghost image is the same as the main image outgoing direction of the collimated light with an incident angle α e . Here we call α e the equivalent incident angle for the collimated light with an incident angle α1 to generate the ghost image.

[0044] For the light with a certain incident angle α in ∈ [α min , α max in the waveguide substrate 10, where α min refers to the minimum incident angle of the light incident on the first surface 101 or the second surface 102, and α maxRefers to the maximum incident angle of light incident on the first surface 101 or the second surface 102. The central incident angle of the light incident on the first surface 101 or the second surface 102 is α mid , the central incident angle α mid of the light whose outgoing direction is perpendicular to the second surface 102 of the waveguide substrate 10 satisfies:

[0045] α min = α c (1.3)

[0046]

[0047] FOV = α max - α min (1.5)

[0048] where FOV is the divergence angle of the incident light that can be transmitted within the waveguide substrate 10, that is, the fluctuation range of the light incident on the first surface 101 or the second surface 102. The central incident angle α mid is namely Figure 3 the incident angle in in-0 , according to Figure 1 the geometric relationship in

[0049] α mid = 2θ2 (1.6)

[0050] For parallel light with an incident angle of α in , its ghost image equivalent incident angle α e is:

[0051] α e = 180° - α in - 2θ2 (1.7)

[0052] Substitute formulas (1.3) - (1.6) into formula (1.7). When the main image and the ghost image just touch, we can get:

[0053]

[0054] If the waveguide substrate 10 is made of H-BAK5 (n = 1.56) and a micro display with an aspect ratio of 16:9 is used, according to formula (1.1) and formula (1.8), the field of view range FOV transmitted within the waveguide substrate 10 is 24°, then the field of view of the augmented reality display system is approximately 43°. The field of view of the augmented reality display system refers to the angle subtended by the virtual image displayed by the augmented reality display system at the human eye. The larger the field of view of the augmented reality display system, the stronger the immersion; the smaller the field of view of the augmented reality display system, the weaker the immersion. In the embodiment of the present invention, a monocular augmented reality display system is adopted, and the field of view of the monocular augmented reality display system is the angle subtended by the human eye at the image displayed by the monocular augmented reality display system. Considering the tolerances during manufacturing and assembly, during design, the incident angle α min should be greater than the critical angle α c , otherwise it may cause the required transmitted field of view not to satisfy the total reflection condition and thus cannot be transmitted. Moreover, in order to have a certain distance between the ghost image and the main image, α max also needs to be appropriately reduced. Therefore, when selecting the arrayed waveguide solution, the field of view of the augmented reality display system generally does not exceed 42°. This is a problem that needs to be further solved.

[0055] According to the above analysis, in the augmented reality display solution of the arrayed waveguide solution, the maximum field of view that the augmented reality display system can transmit is related to the material refractive index of the waveguide substrate 10. If we want to increase the field of view of the augmented reality display system, one method is to use a material with a higher refractive index, but this method will increase the processing difficulty of the process and also increase the cost.

[0056] According to formula (1.7), it can be known that the smaller α e , the closer the ghost image and the main image are; the larger α e , the farther the ghost image and the main image are. If we want to increase α e , then we need to reduce α in or θ2. Among them, α in is limited by the material refractive index of the waveguide substrate 10 and the field of view required to be transmitted by the augmented reality display system. Therefore, we can increase α e by reducing θ2. In the embodiment of the present invention, by reducing θ2, similarly, we can also reduce θ1 to increase the distance between the ghost image and the main image, so as to increase the maximum field of view that the augmented reality display system can transmit.

[0057] Optionally, the angle between the first coupling-out structure 41 and the first surface 101 is greater than or equal to 19.7° and less than or equal to 25.5°, that is, 19.7° ≤ θ1 ≤ 25.5°. The angle between the second coupling-out structure 42 and the second surface 102 is greater than or equal to 19.7° and less than or equal to 25.5°, that is, 19.7° ≤ θ2 ≤ 25.5°.

[0058] In order to further increase the maximum field of view angle that the augmented reality display system can transmit, θ1 and θ2 can be further reduced. Preferably, 19.7° ≤ θ1 ≤ 20.5°, 19.7° ≤ θ2 ≤ 20.5°.

[0059] Continuing to refer to Figure 1 , the monocular augmented reality display system further includes a first polarization device 21. The first polarization device 21 is located between the first micro display screen 11 and the waveguide substrate 10. The first polarization device 21 is used to make the first light beam L1 have a first polarization direction. For example, the first light beam L1 can be made into S-polarized light. The monocular augmented reality display system further includes a second polarization device 22. The second polarization device 22 is located between the second micro display screen 12 and the waveguide substrate 10. The second polarization device 22 is used to make the second light beam L2 have a second polarization direction. For example, the second light beam L2 can be made into P-polarized light. The first polarization direction is perpendicular to the second polarization direction. In the embodiment of the present invention, by providing the first polarization device 21 and the second polarization device 22, it is avoided that the first light beam L1 emitted by the first micro display screen 11 is coupled out by the second coupling structure 42, and it is avoided that the second light beam L2 emitted by the second micro display screen 12 is coupled out by the first coupling structure 41, ensuring the imaging effect of the monocular augmented reality display system.

[0060] Optionally, referring to Figure 1 , the first micro display screen 11, the second micro display screen 12, the first outgoing field light L3 and the second outgoing field light L4 are located on the same side of the waveguide substrate 10. In the embodiment of the present invention, the first light beam L1 emitted by the first micro display screen 11 and the first outgoing field light L3 coupled out through the first coupling structure 41 are located on the same side of the waveguide substrate 10, and the second light beam L2 emitted by the second micro display screen 12 and the second outgoing field light L4 coupled out through the second coupling structure 42 are located on the same side of the waveguide substrate 10, so that it is convenient to arrange the first micro display screen 11 and the second micro display screen 12 on the side of the waveguide substrate 10 close to the human eye, which is beneficial to reducing the volume of the monocular augmented reality display system.

[0061] Optionally, referring to Figure 1 , the monocular augmented reality display system further includes a first imaging element 31. The first imaging element 31 is located between the first micro display screen 11 and the waveguide substrate 10. The first light beam L1 emitted by the first micro display screen 11 becomes parallel light after passing through the first imaging element 31. The monocular augmented reality display system further includes a second imaging element 32. The second imaging element 32 is located between the second micro display screen 12 and the waveguide substrate 10. The second light beam L2 emitted by the second micro display screen 12 becomes parallel light after passing through the second imaging element 32.

[0062] Optionally, referring to Figure 1, the refractive index of the waveguide substrate 10 is less than or equal to 1.56. In the embodiments of the present invention, the refractive index of the waveguide substrate 10 is less than or equal to 1.56. The waveguide substrate 10 can adopt conventional low-refractive-index materials, enabling the monocular augmented reality display system to achieve a larger field of view, reducing the requirements for materials, and reducing the processing cost due to avoiding the use of high-refractive-index materials.

[0063] Optionally, the monocular augmented reality display system further includes a first coating layer (not shown in the figure). The first coating layer is located on the surface of the first coupling-out structure 41 away from the first micro display screen 11, and the first coating layer is located on the side of the first coupling-out structure 41 adjacent to the first surface 101. The monocular augmented reality display system further includes a second coating layer. The second coating layer is located on the surface of the second coupling-out structure 42 away from the second micro display screen 12, and the second coating layer is located on the side of the second coupling-out structure 42 adjacent to the first surface 101. In the embodiments of the present invention, a first coating layer is provided on the surface of the first coupling-out structure 41 away from the first micro display screen 11, so that the first coating layer can reduce the intensity of the reflected light on the surface of the first coupling-out structure 41 away from the first micro display screen 11, and reduce the influence of ghost images generated by reflection on the surface of the first coupling-out structure 41 away from the first micro display screen 11. A second coating layer is provided on the surface of the second coupling-out structure 42 away from the second micro display screen 12, so that the second coating layer can reduce the intensity of the reflected light on the surface of the second coupling-out structure 42 away from the second micro display screen 12, and reduce the influence of ghost images generated by reflection on the surface of the second coupling-out structure 42 away from the second micro display screen 12.

[0064] Exemplarily, referring to Figure 1 , the monocular augmented reality display system further includes a first coupling-in structure 51 and a second coupling-in structure 52. The first light beam L1 is coupled into the waveguide substrate 10 through the first coupling-in structure 51 and undergoes total internal reflection back and forth between the first surface 101 and the second surface 102 of the waveguide substrate 10. The second light beam L2 is coupled into the waveguide substrate 10 through the second coupling-in structure 52 and undergoes total internal reflection back and forth between the first surface 101 and the second surface 102 of the waveguide substrate 10.

[0065] Figure 5 It is a schematic diagram of the propagation of the light beam coupled out by the waveguide substrate provided by the embodiments of the present invention. Figure 6 It is a schematic diagram of the field of view of a monocular augmented reality display system provided by the embodiments of the present invention. Referring to Figure 5 and Figure 6 , exemplarily, the material of the waveguide substrate 10 includes crown glass. Specifically, the material used is H-BAK5 (n = 1.56). The aspect ratios of the screens of the first micro display screen 11 and the second micro display screen 12 are both 16:9. According to formula (1.1), formula (1.3) - formula (1.7), the critical angle α can be obtained. c= 39.87°, α in ∈ [40.92°, 63.08°], θ2 = 26° = 26° (here, θ2 is still taken as an example, and θ1 can be equal to θ2). To obtain a field of view angle of approximately 60°, θ2 is reduced by 21.92°. In this way, the light rays emitted from the first coupling-out structure 41 correspond to the field of view in the range of 34.9° × 19.6° on the left side, and the light rays emitted from the second coupling-out structure 42 correspond to the field of view in the range of 34.9° × 19.6° on the right side. There is a 4° × 19.6° overlapping field of view in the middle between the left and right fields of view. In this way, the field of view angle of the entire diagonal of the picture is approximately 62.28°. Further, according to formulas (1.1), (1.3) - (1.7), it can be obtained that: min(α out ) = 73.08°, where α out is α e . min(α out ) represents the minimum value of α out . The distance between the main image and the ghost image is 15.6°. That is, the left field of view generates the first main image Z1 and the first ghost image G1, and the distance between the first main image Z1 and the first ghost image G1 is 15.6°. The right field of view generates the second main image Z2 and the second ghost image G2, and the distance between the second main image Z2 and the second ghost image G2 is 15.6°.

[0066] Continue to refer to Figure 4 , the main source of the ghost image is the incident light rays that enter the back surfaces of the first coupling-out structure 41 and the second coupling-out structure 42 in the waveguide substrate 10. These light rays should have penetrated the first coupling-out structure 41 and the second coupling-out structure 42 and continued to propagate. However, due to the too large incident angle β on the back surfaces of the first coupling-out structure 41 and the second coupling-out structure 42, reflection occurs, thus changing the original incident angle and becoming a ghost image. Actually, when manufacturing the waveguide substrate 10, when the incident angle β < 85°, a coating can be applied on the first coupling-out structure 41 and the second coupling-out structure 42 to greatly reduce the reflectivity, thereby suppressing the brightness of the ghost image and improving the display effect. When θ2 is 21.92°, for light with any incident angle α in , the maximum incident angle βmax = 85°. Therefore, the adverse effects brought by the ghost image can be suppressed by coating. Among them, βmax is the maximum value of the incident angle β on the back surface of the first coupling-out structure 41 or the second coupling-out structure 42.

[0067] Figure 7 is a schematic diagram of a binocular augmented reality display system provided by an embodiment of the present invention. Refer to Figure 7 , the binocular augmented reality display system 200 includes two monocular augmented reality display systems 100. Among them, the monocular augmented reality display system 100 can adopt the monocular augmented reality display system in any of the above embodiments, thereby expanding the field of view angle of the binocular augmented reality display system.

[0068] Figure 8 Schematic diagram of a head-mounted display provided by an embodiment of the present invention. Refer to Figure 8 , the head-mounted display includes the monocular augmented reality display system 100 or the binocular augmented reality display system 200 in the above embodiment. When the head-mounted display includes the monocular augmented reality display system 100, the head-mounted display only projects images to one eye and leaves the other eye to directly view the external environment. When the head-mounted display includes the binocular augmented reality display system 200, the head-mounted display projects images to both eyes. Since the head-mounted display includes the monocular augmented reality display system 100 or the binocular augmented reality display system 200 in the above embodiment, the embodiment of the present invention increases the field of view angles of the monocular augmented reality display system 100 and the binocular augmented reality display system 200, and the user has a stronger sense of immersion.

[0069] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations with each other and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A monocular augmented reality display system, characterized in that, Comprising: A first microdisplay screen for generating a first light beam; A second microdisplay screen for generating a second light beam; A waveguide substrate including a first coupling-out structure and a second coupling-out structure. After the first light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the first coupling-out structure to form a first outgoing field of view light; After the second light beam is projected onto the waveguide substrate, it is coupled out of the waveguide substrate by the second coupling-out structure to form a second outgoing field of view light; the first light beam and the second light beam are projected into the same waveguide substrate; The first outgoing field of view light and the second outgoing field of view light are on the same side of the waveguide substrate, and the propagation direction of the first outgoing field of view light intersects with the propagation direction of the second outgoing field of view light; The waveguide substrate includes a first surface and a second surface, and the first surface and the second surface are opposite and parallel to each other; The included angle between the first coupling-out structure and the first surface is greater than or equal to 19.7° and less than or equal to 25.5°; The included angle between the second coupling-out structure and the first surface is greater than or equal to 19.7° and less than or equal to 25.5°.

2. The monocular augmented reality display system according to claim 1, characterized in that The included angle between the first coupling-out structure and the first surface is greater than or equal to 19.7° and less than or equal to 20.5°; The included angle between the second coupling-out structure and the first surface is greater than or equal to 19.7° and less than or equal to 20.5°.

3. The monocular augmented reality display system according to claim 1, characterized in that, Further comprising a first polarization device located between the first microdisplay screen and the waveguide substrate for making the first light beam have a first polarization direction; Further comprising a second polarization device located between the second microdisplay screen and the waveguide substrate for making the second light beam have a second polarization direction; The first polarization direction is perpendicular to the second polarization direction.

4. The monocular augmented reality display system according to claim 1, wherein The first microdisplay screen, the second microdisplay screen, the first outgoing field of view light and the second outgoing field of view light are on the same side of the waveguide substrate.

5. The monocular augmented reality display system according to claim 1, wherein Further comprising a first imaging element located between the first microdisplay screen and the waveguide substrate; Further comprising a second imaging element located between the second microdisplay screen and the waveguide substrate.

6. The monocular augmented reality display system according to claim 1, characterized in that, The refractive index of the waveguide substrate is less than or equal to 1.

56.

7. The monocular augmented reality display system according to claim 1, characterized in that Further comprising a first coating layer located on the surface of the first coupling-out structure away from the first microdisplay screen; Further comprising a second coating layer located on the surface of the second coupling-out structure away from the second microdisplay screen.

8. A binocular augmented reality display system, characterized in that, Comprising two monocular augmented reality display systems according to any one of claims 1-7.

9. A head-mounted display, characterized in that, Comprising the monocular augmented reality display system according to any one of claims 1-7 or the binocular augmented reality display system according to claim 8.

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