A side-entry binocular fusion AR system and its light signal angle control method

Abstract

The present invention relates to a side-entry binocular fusion AR system and a method for controlling an optical signal angle thereof. The side-entry binocular fusion AR system includes two monocular vision modules, each monocular vision module includes a microdisplay, an optical engine, and a waveguide plate. The central axis of the microdisplay coincides with the central axis of the optical engine. The prism of the waveguide plate includes at least one array reflective film. A first angle is formed between each array reflective film and a lower reflective surface. When the waveguide plate is parallel to the vision system, the main light of the optical engine is incident perpendicular to the incident surface, thereby changing the fitting angle between the optical engine and the waveguide plate. The fitting angle is less than 2 times the first angle, thereby changing the angle between the main light after entering the waveguide plate and the reflective surface on the waveguide plate, so that the second angle between the main light and the normal of the lower reflective surface when the main light is emitted from the lower reflective surface is equal to the fusion angle. The main light of each monocular vision module enters the human eye at the fusion angle, realizing binocular fusion, ensuring display quality, simplifying the installation process of the optical engine and the waveguide, and reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of augmented reality systems, and in particular to a side-entry binocular fusion AR system and a light signal angle control method thereof. Background Art

[0002] Augmented Reality (AR) refers to technology that uses precise calculations of camera image position and angle, combined with image analysis, to enable the on-screen virtual world to integrate and interact with real-world scenes. The overall AR system framework consists of three major components: data input, 3D registration and reconstruction, and virtual-reality fusion. This fusion requires the use of two monocular vision modules.

[0003] The current side-entry optical waveguide AR structure, when there is no binocular fusion, such as Figure 1 As shown, the system includes two monocular eye modules, which are symmetrically arranged about an axis of symmetry. Each monocular eye module includes a microdisplay, an optical engine, and a waveguide, which are sequentially arranged. The microdisplay and optical engine of each monocular eye module are located to the side of the eye. The waveguide's exit surface is parallel to the visual system, and the distance between the waveguide and the visual system is set to l. The visual system is a person's two eyes. The distance D between the left and right eyes is approximately 64 mm. L1 is generally between 14 and 30 mm. The angle between the optical axis of the optical engine and the waveguide is φ. The value of φ varies for different optical modules, generally ranging from 138° to 150°. The light in the direction of the optical axis of the optical engine is called the principal ray of the optical module. The principal ray exiting the waveguide is perpendicular to the waveguide's exit surface and is also perpendicular to the visual system.

[0004] oxyz is the set coordinate system, Figure 1 In the figure, the microdisplay, optical machine and waveguide pattern are located on the oxy plane, and the optical axis of the optical machine A is parallel to the ox axis.

[0005] Because the two main rays of light emitted by the two monocular modules into the human eye are parallel, binocular fusion cannot be achieved. Binocular fusion means that the two main rays of light emitted by the two monocular modules into the human eye intersect at L = 3 to 5m in front of the human eye. At this time, the angle between the main ray emitted from the waveguide and the normal of the waveguide is θ. In general, (L = L1 + L2) ∈ [3m, 5m], θ = arctan [0.5D / (L1 + L2)], and the value of θ is calculated to be approximately between 0.37° and 0.62°. The angle θ that can achieve binocular fusion is called the fusion angle, such as Figure 2 shown.

[0006] The structure of the arrayed waveguide is as follows Figure 3As shown, an array reflective film 13 is provided between the upper total reflection surface 11 and the lower total reflection surface 12 of the waveguide plate 1. Two adjacent array reflective films, a portion of the upper reflective surface located between the two adjacent array reflective films, and a portion of the lower reflective surface located between the two adjacent array reflective films form a sub-prism. The first included angle between the array reflective film and the lower total reflection surface is β. The coupling prism is provided on the incident path of the principal light and is aligned with the first side edge AE of the waveguide plate. MN is the first reflective surface in the array reflective surface. The first reflective surface, the AE side of the waveguide plate, and the upper total reflection surface and the lower total reflection surface of the waveguide plate constitute the first sub-prism (AEMN) of the waveguide plate. The included angle between the first side edge of the waveguide plate and the upper reflection surface of the waveguide plate, i.e., the first sub-prism (A The third angle of the optical machine EMN is β1, the first side of the coupling prism is aligned with the first side of the waveguide, the fourth angle between the first side of the coupling prism and the second side is β2, the sum of the third angle and the fourth angle constitutes the alignment angle, the optical machine is aligned with the second side of the coupling prism, the main light of the optical machine enters vertically from the second side of the coupling prism, passes through the first side of the coupling prism and enters the waveguide, is reflected by the upper and lower total reflection surfaces in the waveguide, and finally is reflected by the array reflective film and emitted from the lower exit surface of the waveguide; when β1=β2=β, the main light of the optical machine is transmitted through the waveguide and then emitted from the exit surface of the waveguide, the exit light is perpendicular to the exit surface of the waveguide, the main light of the two monocular vision modules are parallel, and enter the human eye vertically respectively.

[0007] In order to achieve binocular fusion, there are currently two structural methods, namely Figure 4 、 5 shown.

[0008] Option 1: If Figure 4 As shown, Figure 1 The microdisplay in the image moves along the oy direction, creating an angle θ between the principal ray and the waveguide's exit surface. The microdisplay moves a distance Δ along the oy direction. By adjusting the position of the microdisplay in the monocular vision module, a certain angle is created between the principal rays of the two modules, achieving binocular fusion. Assuming the focal length of the optical engine is 15mm, and when θ = 0.5°, Δ ≈ 15mm * tan(θ) = 0.13mm. This solution requires a complex algorithm to ensure that the movement distance Δ meets the requirements, and the adjustment process is also relatively complex. Furthermore, the movement distance Δ causes the microdisplay to deviate from the optimal imaging position of each module, resulting in a decrease in image quality.

[0009] Option 2: If Figure 5 As shown, Figure 1 In the scheme, optical modules A and B rotate around oz by an angle of θ respectively. This scheme requires structural parts to ensure the rotation angle. However, for angles of 0.37° to 0.62°, it is difficult to ensure the accuracy of structural parts manufactured using general processing methods. Special processing methods are required to achieve this, which increases the processing cost and difficulty.

[0010] Therefore, how to achieve high-precision and easy-to-operate binocular fusion is an urgent problem to be solved. Summary of the Invention

[0011] The purpose of the present invention is to provide a side-entry binocular fusion AR system and its optical signal angle control method. By changing the incident angle of the main light entering the waveguide, the angle between the main light exiting the exit surface of the waveguide and the normal of the exit surface meets the fusion angle requirement. When the central axis of the optical machine and the central axis of the microdisplay coincide, and the waveguide is parallel to the visual system, binocular fusion is achieved, the processing cost is reduced, and the assembly accuracy of the monocular vision module and the dual-fusion AR system is improved.

[0012] In the first aspect, the above-mentioned object of the present invention is achieved through the following technical solutions:

[0013] A method for controlling the angle of an optical signal of a side-entry binocular fusion AR system includes two monocular vision modules, each of which includes a microdisplay, an optical engine, and a waveguide. The central axis of the microdisplay coincides with the central axis of the optical engine. The prism of the waveguide includes at least one array reflective film, and a first angle is formed between each array reflective film and a lower reflective surface. When the waveguide is parallel to the vision system, the main light of the optical engine is incident perpendicular to the incident surface, changing the fitting angle between the optical engine and the waveguide, thereby changing the angle between the main light and the upper reflective surface of the waveguide after entering the waveguide, so that the second angle between the main light and the normal of the lower reflective surface of the waveguide when the main light is emitted from the lower reflective surface of the waveguide is equal to the fusion angle. The main light of each monocular vision module enters the human eye at the fusion angle, thereby achieving binocular fusion.

[0014] The present invention is further configured as follows: changing the fitting angle between the optical engine and the waveguide plate so that the fitting angle is less than 2 times the first angle, and the main light incident vertically on the incident surface, when emitted from the lower reflection surface of the waveguide plate, forms a second angle with the normal of the lower reflection surface of the waveguide plate equal to the fusion angle, and the main light enters the human eye at an angle equal to the fusion angle, thereby realizing binocular fusion.

[0015] The present invention is further configured as follows: a coupling prism is provided at the first side edge of the waveguide plate where the main light enters, the angle between the first side edge of the waveguide plate and the reflective surface on the waveguide plate is a third angle, the first side edge of the coupling prism is fitted with the first side edge of the waveguide plate, the angle between the first side edge of the coupling prism and the second side edge of the coupling prism is a fourth angle, the sum of the third angle and the fourth angle is equal to the angle of the fitting angle, the second side edge of the coupling prism is the incident surface, the third angle and / or the fourth angle are set to be smaller than the first angle, so that the angle of the fitting angle is smaller than 2 times the first angle, and the main light entering the waveguide plate from the fitting angle, when emitted from the lower reflective surface, enters the human eye at a fusion angle, thereby realizing binocular fusion.

[0016] The present invention is further configured as follows: a coupling prism and an optical wedge are provided at the first side edge of the waveguide plate where the main light enters; the angle between the first side edge of the waveguide plate and the reflective surface on the waveguide plate is a third angle; the first side edge of the coupling prism is aligned with the first side edge of the waveguide plate; the angle between the first side edge of the coupling prism and the second side edge of the coupling prism is a fourth angle; the second side edge of the optical wedge is aligned with the second side edge of the coupling prism; the wedge angle between the second side edge of the optical wedge and the first side edge is a fifth angle; the first side edge of the optical wedge is the incident surface; the angle of the alignment angle is equal to the sum of the third angle and the fourth angle minus the fifth angle, so that the alignment angle is less than twice the first angle.

[0017] The present invention is further configured such that the difference between the fitting angle and twice the first angle is the correction angle. When the visual system is located in air and the refractive index of air is 1, the correction angle satisfies the following formula:

[0018] sin(θ)=nsin(Δφ), where n represents the refractive index of the waveguide, θ represents the angle between the main light and the normal of the waveguide output surface, that is, the second angle, and Δφ represents the correction angle.

[0019] In a second aspect, the above-mentioned object of the present invention is achieved through the following technical solutions:

[0020] An arrayed waveguide plate for a side-entry binocular fusion AR system includes a prism and a coupling prism. The prism includes at least one array reflective film. Each array reflective film forms a first angle with a lower reflective surface. The coupling prism and the prism are bonded together on the optical signal input side to form a bonding angle. When the main light of the optical machine is incident perpendicular to the incident surface, the bonding angle is changed to change the angle between the main light entering the waveguide plate and the reflective surface on the waveguide plate. When the waveguide plate is parallel to the visual system, the main light emitted from the optical machine enters the prism from the bonding point, and after being emitted from the lower reflective surface, it enters the human eye at a second angle to perform binocular fusion.

[0021] The present invention is further configured as follows: the angle between the first side of the waveguide plate and the reflective surface on the waveguide plate is a third angle, the first side of the coupling prism is aligned with the first side of the waveguide plate, the angle between the first side of the coupling prism and the second side of the coupling prism is a fourth angle, the sum of the third angle and the fourth angle is equal to the angle of the alignment angle, the second side of the coupling prism is an incident surface, and the angle of the third angle and / or the fourth angle is reduced so that the angle value of the alignment angle is less than 2 times the angle value of the first angle. This is used to change the angle of the main light entering the prism when the waveguide plate is parallel to the visual system, so that the main light is incident on the human eye at the second angle after being emitted from the lower reflective surface, thereby performing binocular fusion.

[0022] The present invention is further configured as follows: it also includes an optical wedge, the angle between the first side of the waveguide plate and the reflective surface on the waveguide plate is a third angle, the first side of the coupling prism is aligned with the first side of the waveguide plate, the angle between the first side of the coupling prism and the second side of the coupling prism is a fourth angle, the second side of the optical wedge is aligned with the second side of the coupling prism, the wedge angle between the second side of the optical wedge and the first side is a fifth angle, the first side of the optical wedge is an incident surface, the sum of the third angle and the fourth angle minus the wedge angle of the optical wedge constitutes a fitting angle, the angle value of the fitting angle is less than twice the angle value of the first angle, and the optical wedge is used to change the angle at which the main light enters the prism when the waveguide plate is parallel to the visual system, so that the main light is incident on the human eye at the second angle after being emitted from the lower reflective surface, thereby performing binocular fusion.

[0023] The present invention is further configured as follows: the fitting angle is changed by the correction angle, the sum of the fitting angle and the correction angle is equal to 2 times the first angle, and when the visual system is located in the air and the refractive index of the air is 1, the correction angle satisfies the following formula: sin(θ)=nsin(Δφ), where n represents the refractive index of the waveguide, θ represents the angle between the main light and the normal of the waveguide output surface, that is, the second angle, and Δφ represents the correction angle.

[0024] In a third aspect, the above-mentioned object of the present invention is achieved through the following technical solutions:

[0025] A side-entry binocular fusion AR system includes two monocular vision modules, each of which is symmetrically arranged about a symmetry axis. Each monocular vision module includes a microdisplay, an optical engine, and a waveguide arranged in sequence. The microdisplay and optical engine of each monocular vision module are located to the side of the eye, and the central axis of the microdisplay coincides with the central axis of the optical engine. Using the method described in this application, when the waveguide is parallel to the visual system, the second angle between the main light and the normal of the exit surface is equal to the fusion angle, thereby achieving binocular fusion.

[0026] Compared with the prior art, the beneficial technical effects of this application are:

[0027] 1. This invention changes the angle at which the principal ray enters the waveguide, thereby changing the angle between the principal ray and the normal of the waveguide's exit surface. When the angle is equal to the fusion angle, the principal rays of the two side-entry monocular modules enter the visual system at the fusion angle, achieving binocular fusion.

[0028] 2. Furthermore, the present application changes the structure of the waveguide where the light enters, thereby changing the angle at which the main light enters the waveguide, so that the main light is emitted from the exit surface at a fusion angle, thereby achieving binocular fusion;

[0029] 3. Furthermore, the side-entry optical waveguide AR system of the present application adopts a waveguide plate that changes the incident angle of the main light. The central axis of the optical machine coincides with the central axis of the microdisplay, ensuring the display quality. The angle of the incident light end of the waveguide plate is fixed, and when the waveguide plate is parallel to the visual system, the installation process of the optical machine and the waveguide is simplified, reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a side-entry optical waveguide AR system in the prior art;

[0031] Figure 2 This is a schematic diagram of the principle of a side-entry optical waveguide AR system in the prior art;

[0032] Figure 3 This is a schematic diagram of a waveguide structure in the prior art;

[0033] Figure 4 This is a schematic diagram of the structure of a side-entry optical waveguide binocular fusion AR system in the prior art;

[0034] Figure 5 This is a schematic diagram of the structure of another side-entry optical waveguide binocular fusion AR system in the prior art;

[0035] Figure 6 This is a schematic diagram of the principle of a side-entry optical waveguide AR system according to a specific embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of a side-entry optical waveguide structure according to another specific embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of a side-entry optical waveguide structure according to another specific embodiment of the present application. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] The present application provides a method for controlling the angle of light signals in a side-entry binocular fusion AR system, such as Figure 6 As shown, the optical waveguide AR module includes two monocular eye modules, which are symmetrically arranged about the symmetry axis. Each monocular eye module includes a microdisplay, an optical engine and a waveguide plate arranged in sequence. The microdisplay and optical engine of each monocular eye module are located on the side of the eye, and the central axis of the microdisplay coincides with the central axis of the optical engine. The prism of the waveguide plate includes at least one array reflective film, and each array reflective film forms a first angle β with the lower reflective surface. At the light incident surface of the first side of the waveguide plate, the optical engine and the waveguide plate are bonded. The light in the direction of the optical axis of the optical engine is called the main light of the optical module. The main light is incident perpendicular to the incident surface. When the exit surface of the waveguide plate is parallel to the visual system, the distance between the waveguide plate and the visual system is L1.

[0040] Changing the fitting angle between the optical machine and the waveguide plate changes the incident angle of the optical machine's main light entering the waveguide plate, and then changes the incident angle between the main light and the upper reflection surface. After the main light is reflected by the upper total reflection surface of the waveguide plate, it is projected onto the lower total reflection surface of the waveguide plate, and then reflected from the lower total reflection surface to the upper total reflection surface. After multiple total reflections, it encounters the array reflection film in the waveguide plate. After reflection by the array reflection film, it is emitted from the exit surface at a second angle. The second angle is the angle between the exiting main light and the normal of the exit surface. Because the visual system is parallel to the waveguide plate, the second angle is also the angle between the exiting main light and the normal of the visual system.

[0041] When the angle value of the second angle is equal to the fusion angle value, the outgoing main light on the left side enters the left eye at the fusion angle, and the outgoing main light on the right side enters the right eye at the fusion angle. The main light rays on both sides intersect at a certain position in front of the visual system to achieve binocular fusion.

[0042] Change Figure 3 The fitting angle between the optical axis of the optical machine and the waveguide plate is φ-Δφ, where Δφ represents the correction angle. By changing the fitting angle, the main light of the optical machine entering the waveguide plate 1 is totally reflected by the upper total reflection surface 11 and the lower total reflection surface 12, and then transmitted along the waveguide plate body. After being reflected by the array reflection film 13, when it is emitted from the lower exit surface, the angle value of the second angle θ between it and the normal of the lower exit surface is equal to the angle value of the fusion angle. The waveguide plate and the optical machine fitting angle of this embodiment are used to form a monocular eye module. The main light of the two side-entry monocular eye modules enters the human eye at the fusion angle to achieve binocular fusion.

[0043] In a specific embodiment of the present application, Figure 7 As shown, the fourth angle of the coupling prism and the third angle of the first prism of the waveguide plate are combined to change the angle of the light signal. In this case, the angle of the contact angle is equal to the sum of the third angle and the fourth angle.

[0044] A coupling prism 2 is provided at the joint of the waveguide plate, the optical machine is joined to the second side AB of the coupling prism 2, the main light of the optical machine enters the coupling prism 2 perpendicular to the second side, the first side of the coupling prism 2 is joined to the first side AE ​​of the waveguide plate, the angle between the first side and the second side of the coupling prism 2 is the fourth angle β2, the angle between the first side of the waveguide plate and the upper reflecting surface, that is, the angle MAE of the first prism 1 is the third angle β1, the joining angle is equal to the sum of the third angle β1 of the first prism 1 and the fourth angle β2 of the coupling prism 2, and the third angle β1 and / or the fourth angle β2 are set to be smaller than the first angle β, so that the angle value of the joining angle φ-Δφ is less than 2 times the angle value of the first angle β, that is, φ-Δφ=β1+β2<2β, wherein φ=2β, Δφ represents the correction angle, so that the angle of the joining angle is less than 2 times the first angle.

[0045] When the third angle β1 is equal to the first angle β, the fourth angle β2 of the coupling-in prism is reduced to make the fourth angle β2-Δφ, thereby achieving β1+β2<2β.

[0046] Alternatively, when the angle value of the fourth angle β2 is equal to the angle value of the first angle β, the angle value of the third angle is reduced so that the angle value of the third angle is β1-Δφ, thereby achieving β1+β2<2β.

[0047] Alternatively, the angle value of the third angle β1 and the angle value of the fourth angle β2 may be reduced simultaneously to achieve β1+β2<2β.

[0048] The waveguide plate of this embodiment is used to form a monocular module with an optical machine at a fitting angle. The main light of the two side-entry monocular modules enters the human eye at a fusion angle to achieve binocular fusion.

[0049] In a specific embodiment of the present application, Figure 8 As shown, the third angle combination of the optical wedge 3, the coupling prism 2 and the first prism 1 of the waveguide plate is used to change the angle of the optical signal. At this time, the fitting angle is equal to the sum of the third angle of the first prism and the fourth angle of the coupling prism minus the wedge angle of the optical wedge.

[0050] The waveguide plate is provided with a coupling prism 2 and an optical wedge 3 at the entrance of the main light. The optical engine is fitted with the first side of the optical wedge 3. The main light of the optical engine is perpendicularly incident on the first side of the optical wedge 3. The second side of the optical wedge 3 is fitted with the second side of the coupling prism. The first side of the coupling prism is fitted with the first side AE ​​of the waveguide plate. The first side and the second side of the optical wedge 3 form a wedge angle. The wedge angle β3 (angle ABC) of the optical wedge 3 is in the opposite direction to the fitting angle. The fitting angle of the waveguide plate and the optical engine is equal to the sum of the third angle β1 of the first prism 1 and the fourth angle β2 of the coupling prism 2 minus the wedge angle β3, that is, φ-Δφ=β1+β2-β3.

[0051] The wedge angle β3 is set equal to the correction angle Δφ, then φ=β1+β2. When φ=β1+β2=2β, the angle value of the fitting angle φ-Δφ is less than 2 times the angle value of the first angle β.

[0052] The waveguide plate of this embodiment is used to form a monocular module with an optical machine at a fitting angle. The main light of the two side-entry monocular modules enters the human eye at a fusion angle to achieve binocular fusion.

[0053] For optical elements, the processing accuracy is relatively high, and a processing accuracy of 0.05° can be easily achieved. In the embodiment of the present application, the angle value of the second angle θ is between 0.37° and 0.62°. Assuming θ = 0.5°, that is, (0.37° + 0.62°) / 2, it is ensured that even when there is a certain error, the distance between the binocular fusion point and the visual system can be between 3 meters and 5 meters, and binocular fusion can be achieved without damaging the optical imaging quality.

[0054] When β1=β2=β, the values ​​of β1 and β2 are reduced at the same time, or the wedge angle is increased to Δφ to improve the processing accuracy.

[0055] Assume that the refractive index of the waveguide is n, the visual system is located in air, and the refractive index of air is 1. The relationship between the second angle θ and the correction angle Δφ is as follows:

[0056] sin(θ)=nsin(Δφ).

[0057] When the second included angle θ=0.5° and n=1.53, the correction angle Δφ=0.33°, which is easy to implement during optical element processing and improves operability.

[0058] The optical signal angle control method of the present application is used to improve the fitting angle of the waveguide plate. The improved fitting angle of the waveguide plate is fixed, which makes it easy to assemble the monocular vision module and the side-entry binocular fusion AR system. When the improved side-entry binocular fusion AR system is used, the waveguide plate remains parallel to the binocular system, and the central axis of the optical machine coincides with the central axis of the microdisplay.

[0059] The improved side-entry binocular fusion AR system includes two monocular vision modules, which are symmetrically arranged about the symmetry axis. Each monocular vision module includes a microdisplay, an optical machine and the waveguide described in this application, which are arranged in sequence. The microdisplay and optical machine of each monocular vision module are located on the side of the eye, and the fitting angle of the waveguide is corrected. When the exit surface is parallel to the visual system, the main light entering the prism from the optical machine is transmitted between the upper and lower reflection surfaces of the prism. When it is emitted from the lower reflection surface, the angle between the main light and the normal of the lower reflection surface is equal to the fusion angle. The main light entering the left eye and the right eye of the binocular system is fused at a certain distance in front of the eye.

[0060] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling the light signal angle of a side-entry binocular fusion AR system, characterized by: The side-entry binocular fusion AR system includes two monocular vision modules, each of which includes a microdisplay, an optical engine, and a waveguide. The central axis of the microdisplay coincides with the central axis of the optical engine. The prism of the waveguide includes at least one array reflective film. Each array reflective film forms a first angle with the lower reflective surface. When the waveguide is parallel to the vision system, the main light of the optical engine enters perpendicular to the incident surface, changing the fitting angle between the optical engine and the waveguide, thereby changing the angle between the main light and the upper reflective surface of the waveguide after entering the waveguide, so that the second angle between the main light and the normal of the lower reflective surface of the waveguide when it is emitted from the lower reflective surface of the waveguide is equal to the fusion angle. The main light of each monocular vision module enters the human eye at the fusion angle to achieve binocular fusion. The fitting angle between the optical engine and the waveguide is changed so that the fitting angle is less than 2 times the first angle. When the main light incident perpendicular to the incident plane is emitted from the lower reflective surface of the waveguide, the second angle formed with the normal of the lower reflective surface of the waveguide is equal to the fusion angle. The main light enters the human eye at an angle equal to the fusion angle, achieving binocular fusion. A coupling prism and an optical wedge are provided at the first side of the waveguide plate where the main light enters. The angle between the first side of the waveguide plate and the reflective surface on the waveguide plate is a third angle. The first side of the coupling prism is aligned with the first side of the waveguide plate. The angle between the first side of the coupling prism and the second side of the coupling prism is a fourth angle. The second side of the optical wedge is aligned with the second side of the coupling prism. The wedge angle between the second side of the optical wedge and the first side is a fifth angle. The first side of the optical wedge is the incident surface. The angle of the alignment angle is equal to the sum of the third angle and the fourth angle minus the fifth angle, so that the alignment angle is less than twice the first angle.

2. The method for controlling the light signal angle of a side-entry binocular fusion AR system according to claim 1, characterized in that: The difference between the fitting angle and twice the first angle is the correction angle. When the visual system is in air and the refractive index of air is 1, the correction angle satisfies the following formula: sin(θ)=nsin(Δφ), Where n represents the refractive index of the waveguide, θ represents the angle between the principal ray and the normal to the exit surface of the waveguide, i.e., the second angle, and Δφ represents the correction angle.

3. An arrayed waveguide for a side-entry binocular fusion AR system, comprising a prism and an input prism. The prism includes at least one array reflective film, each array reflective film forms a first angle with a lower reflective surface, and the input prism and the prism are bonded together on the optical signal input side to form a bonding angle. The invention is characterized by: When the optical machine's main ray is incident perpendicular to the incident surface, the angle of the joint angle is changed to change the angle between the main ray entering the waveguide plate and the reflective surface on the waveguide plate. When the waveguide plate is parallel to the visual system, the main ray emitted from the optical machine enters the prism from the joint point, and after being emitted from the lower reflective surface, it enters the human eye at a second angle to achieve binocular fusion. The optical wedge is also included. The angle between the first side of the waveguide plate and the reflective surface on the waveguide plate is a third angle. The first side of the coupling prism is aligned with the first side of the waveguide plate. The angle between the first side of the coupling prism and the second side of the coupling prism is a fourth angle. The second side of the optical wedge is aligned with the second side of the coupling prism. The wedge angle between the second side of the optical wedge and the first side is a fifth angle. The first side of the optical wedge is the incident surface. The sum of the third angle and the fourth angle minus the wedge angle of the optical wedge constitutes a fitting angle. The fitting angle is less than twice the value of the first angle. The optical wedge is used to change the angle at which the main light enters the prism when the waveguide plate is parallel to the visual system, so that the main light is incident on the human eye at the second angle after being emitted from the lower reflective surface, thereby performing binocular fusion.

4. The arrayed waveguide for a side-entry binocular fusion AR system according to claim 3, characterized in that: The correction angle is used to change the fitting angle. The sum of the fitting angle and the correction angle is equal to twice the first angle. When the visual system is located in air and the refractive index of air is 1, the correction angle satisfies the following formula: sin(θ)=nsin(Δφ), Where n represents the refractive index of the waveguide, θ represents the angle between the principal ray and the normal to the exit surface of the waveguide, i.e., the second angle, and Δφ represents the correction angle.

5. A side-entry binocular fusion AR system, characterized by: The invention comprises two monocular vision modules, each of which is symmetrically arranged about an axis of symmetry, each of which comprises a microdisplay, an optical machine and a waveguide plate arranged in sequence, the microdisplay and the optical machine of each monocular vision module are located on the side of the eye, the central axis of the microdisplay coincides with the central axis of the optical machine, and the method as described in any one of claims 1-2 is adopted. When the waveguide plate is parallel to the visual system, the second angle between the main light and the normal of the exit surface is equal to the fusion angle, thereby realizing binocular fusion.

Images