Waveguide sheet, ar glasses and preparation method of waveguide sheet

Abstract

This invention discloses a waveguide sheet, AR glasses, and a method for fabricating the waveguide sheet. The waveguide sheet includes an input region, a transition region, and an output region. The vertical distance between the center of the input region and the center of the output region is less than a preset distance. The transition region is located above and / or below the center of the input region and the center of the output region. Light incident on the input region propagates to the output region after passing through the transition region. Based on the principle that a light beam enters from the input region, propagates through the transition region, and exits from the output region in the waveguide sheet, the vertical distance between the centers of the input and output regions is less than the preset distance, thus the input and output regions are closely aligned vertically, and the overall size of the waveguide sheet in the vertical direction can be reduced.

Description

Technical Field

[0001] This invention relates to the field of near-eye display technology, and more particularly to a waveguide sheet, AR glasses, and a method for preparing the waveguide sheet. Background Technology

[0002] Waveguides with transition regions typically employ one-dimensional gratings as their diffraction microstructures, while waveguides with only coupling-in and coupling-out regions often use two-dimensional gratings or a combination of one-dimensional and two-dimensional gratings. From a current manufacturing perspective, one-dimensional grating diffraction structures are easier to fabricate, and waveguides with transition regions offer higher energy efficiency and uniformity. However, existing technologies for waveguides with transition regions suffer from a larger overall structural size and a less compact design.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a waveguide sheet, AR glasses and a method for manufacturing the waveguide sheet, in order to address the above-mentioned defects of the prior art. The aim is to solve the problem that the waveguide sheet with the transition zone in the prior art has a large overall structural size and is not compact.

[0005] The technical solution adopted by this invention to solve the technical problem is as follows:

[0006] A waveguide sheet includes: a coupling-in region, a transition region, and a coupling-out region; wherein,

[0007] The vertical distance between the center of the coupling-in area and the center of the coupling-out area is less than a preset distance;

[0008] The turning zone is located above and / or below the position between the center of the coupling-in zone and the center of the coupling-out zone;

[0009] The incident light in the coupling region propagates to the coupling out region after passing through the turning region.

[0010] In the waveguide sheet, the diffraction microstructures in the transition region and the diffraction microstructures in the coupling region are both one-dimensional gratings, and the preset distance is 10 mm.

[0011] The waveguide sheet, wherein the angle between the grating lines of the diffraction microstructure in the transition region and the horizontal direction is less than 5°;

[0012] The horizontal distance between the center of the coupling zone and the center of the coupling zone is 20mm to 50mm.

[0013] The waveguide sheet, wherein the angle between the grating lines of the diffraction microstructure in the coupling region and the horizontal direction is 60° to 80°;

[0014] The transition region is located in the direction of the normal to the grating line of the diffraction microstructure in the coupling region.

[0015] The waveguide sheet, wherein the angle between the grating lines of the diffraction microstructure in the coupling region and the horizontal direction is 40° to 50°;

[0016] The transition region is located in the direction of the normal to the grating line of the diffraction microstructure in the coupling region.

[0017] The waveguide sheet, wherein the period of the diffraction microstructure in the coupling region is 350 nm to 450 nm; and / or

[0018] The period of the diffraction microstructure in the transition region is 380 nm to 400 nm; and / or

[0019] The period of the diffraction microstructure in the coupling region is 350 nm to 370 nm.

[0020] The waveguide sheet, wherein the diffraction microstructure in the coupling region is a one-dimensional grating or a two-dimensional grating; and / or

[0021] The refractive index of the waveguide is 1 to 2.4; and / or

[0022] The refractive index of the diffraction microstructure in the coupling region is 1–2.4; and / or

[0023] The refractive index of the diffraction microstructure in the coupling region is 1–2.4; and / or

[0024] The refractive index of the diffraction microstructure in the transition region is 1 to 2.4.

[0025] An AR glasses comprising a waveguide sheet as described in any of the preceding claims.

[0026] The AR glasses, wherein the AR glasses further include:

[0027] Picture frames;

[0028] The frame of the device covers part of the turning area.

[0029] A method for fabricating a waveguide sheet as described above, comprising the steps of:

[0030] Determine the size and center location of the coupling-in region, and the size and center location of the coupling-out region;

[0031] Based on the size and center position of the coupling-in region and the size and center position of the coupling-out region, determine the parameters of the diffraction microstructure in the transition region, the parameters of the diffraction microstructure in the coupling-in region, and the parameters of the diffraction microstructure in the coupling-out region.

[0032] The size and position of the transition region are determined based on the size and center position of the coupling-in region, the size and center position of the coupling-out region, the parameters of the diffraction microstructure in the transition region, and the parameters of the diffraction microstructure in the coupling-in region.

[0033] A waveguide sheet is fabricated based on the size and center position of the coupling-in region, the size and center position of the coupling-out region, the size and position of the transition region, the parameters of the diffraction microstructure in the transition region, the parameters of the diffraction microstructure in the coupling-in region, and the parameters of the diffraction microstructure in the coupling-out region.

[0034] Beneficial effects: Based on the fact that the light beam enters from the coupling region in the waveguide and propagates through the turning region to the coupling region and exits from the coupling region, since the vertical distance between the center of the coupling region and the center of the coupling region is less than the preset distance, the coupling region and the coupling region are closely close in the vertical direction, and the overall size of the waveguide in the vertical direction can be reduced. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the first structure of the waveguide sheet in this invention.

[0036] Figure 2 This is a schematic diagram of the second structure of the waveguide sheet in this invention.

[0037] Figure 3 This is a schematic diagram of the third structure of the waveguide sheet in this invention.

[0038] Figure 4 This is a schematic diagram of the fourth structure of the waveguide sheet in this invention.

[0039] Figure 5 This is a schematic diagram of the grating lines in this invention.

[0040] Figure 6 This is a schematic diagram of the lens structure in this invention.

[0041] Figure 7 This is a flowchart of the waveguide sheet fabrication method in this invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10. Coupling in region; 11. Raster line; 20. Coupling out region; 30. Turning point region; 40. Frame; θ. Angle between the grating line and the horizontal direction. Detailed Implementation

[0044] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, the first feature "above or below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, "above" and "over" can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. The first feature being "below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," etc., used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0049] Please also refer to Figures 1-6 This invention provides some embodiments of a waveguide sheet.

[0050] like Figure 1 and Figure 6 As shown, a waveguide sheet of the present invention includes:

[0051] Coupled in region 10, transition region 30 and couple out region 20;

[0052] The vertical distance between the center of the coupling-in region 10 and the center of the coupling-out region 20 is less than a preset distance;

[0053] The turning zone 30 is located above and / or below the position between the center of the coupling zone 10 and the center of the coupling zone 20;

[0054] The incident light in the coupling region 10 propagates to the coupling region 20 after passing through the turning region 30.

[0055] like Figure 1As shown, the Y-axis is considered vertical and the X-axis horizontal. It's worth noting that a waveguide is a structure that allows light beams to propagate internally, confining signal light within it and directing it in a specific direction. The coupling region 10 is the area where the light beam is coupled into the waveguide, the coupling region 20 is the area where the light beam is coupled out of the waveguide, and the transition region 30 is the area where the light beam propagating from the coupling region 10 propagates to the coupling region 20. To ensure that the light beam incident in the coupling region 10 propagates to the coupling region 20 after passing through the transition region 30, the transition region 30 is located above and / or below the center of the coupling region 10 and the center of the coupling region 20. That is, the transition region 30 is located above and / or below the line connecting the center of the coupling region 10 and the center of the coupling region 20. The light beam incident in the coupling region 10 propagates towards the transition region 30, expands its pupil after passing through the transition region 30, and then propagates to the coupling region 20.

[0056] Based on the principle that a light beam enters from the coupling region 10 in the waveguide sheet and propagates through the turning region 30 to the coupling region 20 and exits from the coupling region 20, since the vertical distance between the center of the coupling region 10 and the center of the coupling region 20 is less than a preset distance, the coupling region 10 and the coupling region 20 are closely close together in the vertical direction, and the overall size of the waveguide sheet in the vertical direction can be reduced. Moreover, the waveguide sheet has higher energy utilization and uniformity.

[0057] It should be emphasized that two transition zones 30 can be set, one above and one below the center of the coupling-in zone 10 and the other below the center of the coupling-out zone 20, respectively. For example... Figures 1-4 As shown, the coupling region 10 can be located to the left or right of the coupling region 20, and the transition region 30 can be located above or below it. The diffraction microstructure of the coupling region 10 can be disposed on one or both sides of the waveguide sheet, the diffraction microstructure of the coupling region 20 can be disposed on one or both sides of the waveguide sheet, and the diffraction microstructure of the transition region 30 can be disposed on one or both sides of the waveguide sheet. The diffraction microstructures of the coupling region 10, the transition region 30, and the coupling region 20 can be on the same surface of the waveguide sheet or located on two separate surfaces of the waveguide sheet.

[0058] There is a certain gap between the coupling-in region 10 and the coupling-out region 20. The transition region 30 and the coupling-in region 10 can be spaced apart or adjacent to each other. The transition region 30 and the coupling-out region 20 can be spaced apart or adjacent to each other.

[0059] In a preferred implementation of this invention, such as Figures 1-4 As shown, the diffraction microstructures in the transition region 30 and the diffraction microstructures in the coupling region 20 are both one-dimensional gratings, and the preset distance is 10 mm.

[0060] Specifically, in order to reduce the fabrication difficulty of the waveguide sheet, the diffraction microstructures in the transition region 30 and the coupling region 20 are both one-dimensional gratings, which makes it easier to form the transition region 30 and the coupling region 20, thus reducing the fabrication cost.

[0061] The preset distance can be set as needed. Usually, the preset distance is 1 / 12 to 1 / 2 of the width of the waveguide in the vertical direction. When the waveguide is used in the lens of an eyeglass, the width in the vertical direction is usually 20mm to 120mm. For example, if the preset distance is 10mm, the center of the coupling region 10 and the center of the coupling region 20 will be close to each other in the vertical direction.

[0062] In a preferred implementation of this invention, such as Figure 1 and Figure 5 As shown, the angle θ between the grating line 11 of the diffraction microstructure in the transition region 30 and the horizontal direction is less than 5°.

[0063] Specifically, the angle θ between the grating line 11 of the diffraction microstructure in the transition region 30 and the horizontal direction is small. Since the center of the coupling region 10 and the center of the coupling region 20 are close to each other in the vertical direction, that is, the angle θ between the line connecting the center of the coupling region 10 and the center of the coupling region 20 and the horizontal direction is small, the transition region 30 adopts the grating line 11 with a small angle θ with the horizontal direction, which is beneficial to propagate the light beam incident in the coupling region 10 to the coupling region 20.

[0064] It should be noted that, in order to further improve the compactness of the structure, with the center of the coupling zone 10 as the origin O, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, the center of the coupling zone 20 and the turning zone 30 are respectively set on both sides of the X-axis. That is, when the Y-coordinate of the center of the coupling zone 20 is positive, the Y-coordinate of the turning zone 30 (or the center of the turning zone 30) is negative; conversely, when the Y-coordinate of the center of the coupling zone 20 is negative, the Y-coordinate of the turning zone 30 (or the center of the turning zone 30) is positive.

[0065] In a preferred implementation of this invention, such as Figures 1-5 As shown, the horizontal distance between the center of the coupling-in region 10 and the center of the coupling-out region 20 is 20mm to 50mm.

[0066] Specifically, the horizontal distance between the center of the coupling zone 10 and the center of the coupling zone 20 can be set as needed. The horizontal distance between the center of the coupling zone 10 and the center of the coupling zone 20 is 20mm to 50mm. That is, when a coordinate system is established with the center of the coupling zone 10 as the origin O, the X coordinate of the center of the coupling zone 20 is 20mm to 50mm, or -50mm to -20mm.

[0067] In a preferred implementation of this invention, such as Figure 1 and Figure 5 As shown, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 10 and the horizontal direction is 60° to 80°; the turning region 30 is located in the normal direction of the grating line 11 of the diffraction microstructure in the coupling region 10.

[0068] Specifically, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 10 and the horizontal direction can be set as needed. To facilitate the propagation of the incident light beam from the coupling region 10 to the transition region 30, the transition region 30 is located in the normal direction of the grating line 11 of the diffraction microstructure in the coupling region 10. Based on this, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 10 and the horizontal direction is set to 60° to 80°. Since the angle θ between the grating line 11 of the diffraction microstructure in the transition region 30 and the horizontal direction is less than 5° and the horizontal distance between the center of the coupling region 10 and the center of the coupling region 20 is 20mm to 50mm, setting the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 10 and the horizontal direction to 60° to 80° ensures that the transition region 30 can smoothly propagate the light beam to the coupling region 20, while also forming a compact structure.

[0069] It should be noted that the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 10 and the horizontal direction is related to the position of the transition region 30. The normal direction of the grating line 11 of the diffraction microstructure in the coupling region 10 points towards the transition region 30, which facilitates the propagation of light incident from the coupling region 10 to the transition region 30. Since the transition region 30 can be located above or below the X-axis, when the transition region 30 is located above the X-axis, the angle between the grating line 11 of the diffraction microstructure in the coupling region 10 and the X-axis is -80° to -60° (the angle in the counterclockwise direction is positive, and the angle in the clockwise direction is negative); when the transition region 30 is located below the X-axis, the angle between the grating line 11 of the diffraction microstructure in the coupling region 10 and the X-axis is 60° to 80°.

[0070] In a preferred implementation of this invention, such as Figure 1 and Figure 5 As shown, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 20 and the horizontal direction is 40° to 50°; the turning region 30 is located in the normal direction of the grating line 11 of the diffraction microstructure in the coupling region 20.

[0071] Specifically, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 20 and the horizontal direction can be set as needed. In order to facilitate the propagation of the light beam from the turning region 30 to the coupling region 20 and its exit from the coupling region 20, the turning region 30 is located in the normal direction of the grating line 11 of the diffraction microstructure in the coupling region 20. Based on this, the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 20 and the horizontal direction is 40° to 50°.

[0072] It should be noted that the angle θ between the grating line 11 of the diffraction microstructure in the coupling region 20 and the horizontal direction is related to the position of the transition region 30. The normal direction of the grating line 11 of the diffraction microstructure in the coupling region 20 points towards the transition region 30, facilitating the propagation of light rays from the transition region 30 to the coupling region 20. Since the transition region 30 can be located above or below the X-axis, when the transition region 30 is located above the X-axis, the angle between the grating line 11 of the diffraction microstructure in the coupling region 20 and the X-axis is 40° to 50° (the angle in the counterclockwise direction is positive, and the angle in the clockwise direction is negative); when the transition region 30 is located below the X-axis, the angle between the grating line 11 of the diffraction microstructure in the coupling region 20 and the X-axis is -50° to -40°.

[0073] In a preferred implementation of this invention, such as Figure 1 and Figure 5 As shown, the period of the diffraction microstructure in the coupling region 10 is 350 nm to 450 nm; and / or

[0074] The period of the diffraction microstructure in the transition region 30 is 380 nm to 400 nm; and / or

[0075] The period of the diffraction microstructure in the coupling region 20 is 350 nm to 370 nm.

[0076] Specifically, the period of the diffraction microstructure in each region of the waveguide sheet (i.e., the period of the grating) can be set as needed. Typically, the period of the diffraction microstructure in the transition region 30 is larger, the period of the diffraction microstructure in the coupling region 20 is smaller, and the period of the diffraction microstructure in the coupling region 10 is adjusted according to the period of the diffraction microstructure in the transition region 30 and the period of the diffraction microstructure in the coupling region 20. Through coordinated adjustment, it can be ensured that the light emitted from the coupling region 20 is more uniform.

[0077] In a preferred implementation of this invention, such as Figures 1-4 As shown, the diffraction microstructure in the coupling region 10 is a one-dimensional grating or a two-dimensional grating.

[0078] Specifically, the diffraction microstructure in the coupling region 10 can be a one-dimensional grating or a two-dimensional grating. It should be noted that when the waveguide sheet is used in eyeglass lenses, there are usually two output regions 20, corresponding to the two eyes respectively. One or two coupling regions 10 can be set. When there is one coupling region 10, the light beam enters from the coupling region 10 and propagates through two turning regions 30 to the two output regions 20. The coupling region 10 can be a two-dimensional grating. When there are two coupling regions 10, each coupling region 10 corresponds to one output region 20.

[0079] In a preferred embodiment of the present invention, the refractive index of the waveguide sheet is 1 to 2.4; and / or

[0080] The refractive index of the diffraction microstructure in the coupling region 10 is 1–2.4; and / or

[0081] The refractive index of the diffraction microstructure in the coupling region 20 is 1–2.4; and / or

[0082] The refractive index of the diffraction microstructure in the transition region 30 is 1 to 2.4.

[0083] Specifically, the refractive index of the waveguide sheet and diffraction microstructure can be set as needed. For example, the refractive index will be different when different materials are used to make the waveguide sheet and diffraction microstructure. For example, glass or resin can be used to make the waveguide sheet and diffraction microstructure. Specific Implementation Example 1

[0085] The waveguide has a maximum FOV of 28°, an eyebox size of 15mm × 11mm, an eye relief of 18mm, and a horizontal distance of 40mm between the centers of the waveguide insertion and extraction regions. The vertical distance between the centers of the insertion and extraction regions is 0mm. The period of the diffraction microstructure in the insertion region is 400nm, with an azimuth angle of 70°. The period of the diffraction microstructure in the transition region is 390nm, with an azimuth angle of 0°. The period of the diffraction microstructure in the extraction region is 360nm, with an azimuth angle of -45°. The waveguide structure diagram can be calculated based on these parameters, as shown below. Figure 1 As shown, the overall size of the waveguide in the Y direction (vertical direction) can be reduced to less than 33 mm.

[0086] Based on the waveguide sheet described in any of the above embodiments, the present invention also provides a preferred embodiment of AR glasses:

[0087] like Figure 1 and Figure 6 As shown, the AR glasses of this embodiment include:

[0088] Waveguide sheet as described in any of the above embodiments.

[0089] Specifically, waveguide sheets are used as lenses for AR glasses.

[0090] In a preferred embodiment of the present invention, the AR glasses further include:

[0091] Picture frames;

[0092] The frame of the device covers part of the turning area.

[0093] Specifically, the turning area is extended into the frame. Since the turning area does not emit light, this method can further reduce the size of the waveguide in the vertical direction.

[0094] Based on the waveguide sheet described in any of the above embodiments, the present invention also provides a preferred embodiment of a method for fabricating the waveguide sheet:

[0095] like Figure 7 As shown, the waveguide sheet fabrication method of this invention includes the following steps:

[0096] Step S100: Determine the size and center position of the coupling-in region, and the size and center position of the coupling-out region.

[0097] Step S200: Based on the size and center position of the coupling-in region and the size and center position of the coupling-out region, determine the parameters of the diffraction microstructure in the transition region, the parameters of the diffraction microstructure in the coupling-in region, and the parameters of the diffraction microstructure in the coupling-out region.

[0098] Step S300: Determine the size and position of the transition region based on the size and center position of the coupling-in region, the size and center position of the coupling-out region, the parameters of the diffraction microstructure in the transition region, and the parameters of the diffraction microstructure in the coupling-in region.

[0099] Step S400: Prepare a waveguide sheet according to the size and center position of the coupling-in region, the size and center position of the coupling-out region, the size and position of the transition region, the parameters of the diffraction microstructure in the transition region, the parameters of the diffraction microstructure in the coupling-in region, and the parameters of the diffraction microstructure in the coupling-out region.

[0100] Specifically, the coupling area can be circular or polygonal, and the polygonal area can be quadrilateral, hexagonal, etc. The coupling area can also be polygonal, such as quadrilateral. First, determine the size and center position of the coupling area. For example, establish an XY coordinate system with the center of the coupling area as the origin, and the coordinates of the center position of the coupling area are (0, 0). The unit here is mm. The size of the coupling area can also be determined as needed. For example, the coupling area can be circular with a radius of 3 mm. Then, determine the size and center position of the coupling area as needed. For example, the coordinates of the center position of the coupling area are (40, 0). The size of the coupling area can be determined as needed. For example, the coupling area can be rectangular with a length of 30 mm and a width of 20 mm.

[0101] After determining the size and center position of the coupling-in region and the coupling-out region, the parameters of the diffraction microstructure in each region are determined. For example, the period and type of the diffraction microstructure, and the angle between the grating lines of the diffraction microstructure and the X-axis are determined. The types of diffraction microstructures here include one-dimensional gratings and two-dimensional gratings.

[0102] Determine the size and location of the transition zone. For example, the transition zone is represented by a pentagon, and the size and location of the transition zone are represented by the five vertices of the pentagon. The coordinates of the five vertices are (2, 5), (10, 1), (40, 12), (35, 18), and (25, 20).

[0103] Once the dimensions, center positions, and parameters of the diffraction microstructure of each region are determined, the waveguide sheet can be fabricated. Specifically, waveguide sheets can be fabricated using methods such as injection molding.

[0104] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A waveguide sheet comprising: The coupling-in area, the turning area and the coupling-out area; characterized in that, The distance between the center of the coupling-in area and the center of the coupling-out area in the vertical direction is less than a preset distance; the preset distance is 10 mm; The turning area is located above or below the position between the center of the coupling-in area and the center of the coupling-out area; The incident light of the coupling-in area propagates to the coupling-out area after passing through the turning area; The diffraction microstructure in the coupling-in area is a one-dimensional grating; The angle between the grating lines of the diffraction microstructure in the turning area and the horizontal direction is less than 5°; The distance between the center of the coupling-in area and the center of the coupling-out area in the horizontal direction is 20 mm-50 mm; The turning area is located in the normal direction of the grating lines of the diffraction microstructure in the coupling-in area; the turning area is located in the normal direction of the grating lines of the diffraction microstructure in the coupling-out area; The angle between the grating lines of the diffraction microstructure in the coupling-in area and the horizontal direction is 60°-80°, and the angle between the grating lines of the diffraction microstructure in the coupling-out area and the horizontal direction is 40°-50°.

2. The waveguide sheet of claim 1, wherein, The diffraction microstructure in the turning area and the diffraction microstructure in the coupling-out area are both one-dimensional gratings.

3. The waveguide sheet of claim 2, wherein, The period of the diffraction microstructure in the coupling-in area is 350 nm-450 nm; and / or The period of the diffraction microstructure in the turning area is 380 nm-400 nm; and / or The period of the diffraction microstructure in the coupling-out area is 350 nm-370 nm.

4. The waveguide sheet according to any one of claims 1 to 3, wherein The refractive index of the waveguide sheet is 1-2.4; and / or The refractive index of the diffraction microstructure in the coupling-in area is 1-2.4; and / or The refractive index of the diffraction microstructure in the coupling-out area is 1-2.4; and / or The refractive index of the diffraction microstructure in the turning area is 1-2.

4.

5. An AR eyeglass, characterized by, The waveguide sheet comprises the waveguide sheet according to any one of claims 1-4.

6. The AR glasses of claim 5, wherein, The AR glasses further comprise: A frame; The device frame covers the part of the turning area.

7. A method of producing a waveguide sheet as claimed in any one of claims 1 to 4, characterized in that The method comprises the steps of: Determining the size and center position of the coupling-in area, and the size and center position of the coupling-out area; According to the size and center position of the coupling-in area, and the size and center position of the coupling-out area, determining the parameters of the diffraction microstructure in the turning area, the parameters of the diffraction microstructure in the coupling-in area, and the parameters of the diffraction microstructure in the coupling-out area; According to the size and center position of the coupling-in area, the size and center position of the coupling-out area, the parameters of the diffraction microstructure in the turning area, the parameters of the diffraction microstructure in the coupling-in area, determining the size and position of the turning area; According to the size and center position of the coupling-in area, the size and center position of the coupling-out area, the size and position of the turning area, the parameters of the diffraction microstructure in the turning area, the parameters of the diffraction microstructure in the coupling-in area, and the parameters of the diffraction microstructure in the coupling-out area, preparing the waveguide sheet.

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