Optical waveguide device and display apparatus

Abstract

The utility model discloses an optical waveguide device, which comprises a waveguide substrate and a coupling-out grating arranged on the waveguide substrate, the coupling-out grating internally comprises a first area, the coupling-out grating internally and / or externally comprises a second area, and the first area and the second area are adjacent and have different coupling-out energy. A transition boundary zone is formed between the first area and the second area; a plurality of first protruding parts extending from the edge of the first area to the second area are arranged in the transition boundary belt. On a first boundary line where the transition boundary belt is connected with the first area, a plurality of first protruding parts are sequentially arranged, and a first concave part is formed between any two adjacent first protruding parts. According to the scheme of the utility model, through the arrangement of the transition boundary zone, the coupling-out energy difference between the first area and the second area can be smoothly transited, so that the existence of the partition boundary perceived by human eyes can be effectively relieved, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical display, and in particular relates to an optical waveguide device and a display equipment. Background Art

[0002] In the field of augmented reality (AR) and mixed reality (MR), compared with Bird Bath (BB, semi-reflective), worm eye (off-axis reflective), free-form prism and other display solutions, the optical waveguide solution is thinner and lighter, and has a larger eye box, so it has a broader application prospect. In the diffraction optical waveguide solution, the free space light beam (virtual image) projected by the light engine to the optical waveguide is converted by the coupling-in area into a light beam transmitted in the optical waveguide substrate in the form of total reflection, and the coupling-out area performs the reverse process, converting part of the light beam transmitted in the form of total reflection into a free space light beam to be received by the human eye; on the other hand, the ambient light (real image) of the real world outside is incident on the optical waveguide, and is received by the human eye through transmission in the unstructured area or zero-order transmission in the coupling-out area, so that the virtual image and the real image are superimposed on each other and reach the human eye.

[0003] In order to improve the uniformity of outcoupling in different fields of view when the human eye is in the eye box, the outcoupling grating in the outcoupling area usually has more than one sub-division. When the human eye moves in the eye box, the outcoupling energy at the boundary of the outcoupling grating will suddenly change, which will make the human eye clearly perceive the brightness difference. Figure 1a and 1b The outcoupling grating shown has two sub-partitions as an example. Figure 1a In the figure, sub-partition 1 has more coupled-out energy, while sub-partition 2 has less coupled-out energy, which is assumed to be 0 (for example only, not for limiting the present invention). The dotted circle in the figure represents the pupil of the human eye. When the center of the pupil of the human eye is located at position A of sub-partition 1 (the pupil contour is tangent to the boundaries of the two sub-partitions), the brightness perceived by the human eye is the same as when the pupil is located inside sub-partition 1, and both reach the maximum value; when the center of the pupil of the human eye moves to position B, the brightness perceived by the human eye drops to half; when the center of the pupil of the human eye moves to position C of sub-partition 2 (the pupil contour is tangent to the boundaries of the two sub-partitions), the brightness perceived by the human eye is 0. Figure 2 For the corresponding Figure 1a The curve diagram of human eye perception of brightness in the grating partition structure is as follows: Figure 2 When the pupil of the human eye is at position B, the slope of the perceived brightness curve is steep, and the human eye can clearly perceive the existence of the boundary, resulting in a poor user experience. Utility Model Content

[0004] In view of the above problems, the purpose of the present utility model is to provide an optical waveguide device and a display device that can alleviate the human eye's perception of the existence of partition boundaries, so as to enhance the user experience.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An optical waveguide device comprises a waveguide substrate and a coupling-out grating arranged on the waveguide substrate, wherein the coupling-out grating comprises a first region, the coupling-out grating comprises a second region inside and / or outside the coupling-out grating, the first region and the second region are adjacent to each other and have different coupling-out energies, and a transition boundary zone is formed between the first region and the second region;

[0007] Among them, the transition boundary zone is provided with a plurality of first protrusions extending from the edge of the first area toward the second area; on the first boundary line connecting the transition boundary zone and the first area, the plurality of first protrusions are arranged in sequence and a first recessed portion is formed between any two adjacent first protrusions.

[0008] Preferably, the transition boundary band is also provided with a plurality of second protrusions extending from the edge of the second area toward the first area; on the second boundary line connecting the transition boundary band and the second area, the plurality of second protrusions are arranged in sequence and a second recessed portion is formed between any two adjacent second protrusions; the plurality of first protrusions form a third boundary line in the transition boundary band, and the plurality of second protrusions form a fourth boundary line in the transition boundary band, and the fourth boundary line has a complementary meshing shape with the third boundary line.

[0009] Preferably, the gap between the fourth boundary line and the third boundary line is no greater than 50 μm.

[0010] Preferably, the vertical distance between the first boundary line and the second boundary line is the width of the transition boundary zone, and the width of the transition boundary zone is 1 mm to 4 mm.

[0011] Preferably, in the extension direction of the transition boundary band, the transition boundary band has a uniform width, or the width of the transition boundary band gradually decreases or increases, or the width of the transition boundary band first decreases and then increases, or the width of the transition boundary band first increases and then decreases.

[0012] Preferably, the first protrusion is triangular sawtooth-shaped or sawtooth-shaped with a flat edge or a circular edge at the top.

[0013] Preferably, among the plurality of first protrusions, all the first protrusions have the same shape or have two or more different shapes.

[0014] Preferably, a length of the first protrusion on the first boundary line and a length of the second protrusion on the second boundary line are both no greater than a diameter of a human eye pupil.

[0015] Preferably, a length of the first protrusion on the first boundary line and a length of the second protrusion on the second boundary line are both no greater than 4 mm.

[0016] Preferably, in the extension direction along the first boundary line, the lengths of multiple first protrusions are equal, or the lengths of multiple first protrusions first decrease and then increase, or the lengths of multiple first protrusions first increase and then decrease; and / or, for any first protrusion, the line connecting the two end points located on the first boundary line is taken as the base, the vertex or the top tangent point located outside the first boundary line is taken as the vertex, the vertical distance between the vertex and the perpendicular bisector of the base is defined as the vertex offset, and the vertex offsets of multiple first protrusions gradually change.

[0017] The utility model also provides a display device, which comprises the optical waveguide device as described above.

[0018] The optical waveguide device and the display device provided by the embodiments of the utility model form a transition boundary zone between the first area and the second area with different outcoupling energies in the outcoupling area, and the transition boundary zone at least contains a part of the light outcoupling characteristics of the first area, so that the outcoupling energy difference between the first area and the second area can be smoothly transitioned, thereby effectively alleviating the existence of the partition boundary perceived by the human eye and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1a is an exemplary illustration of an existing out-coupling grating having two sub-divisions with different out-coupling energies;

[0020] Figure 1b is with Figure 1a A corresponding cross-sectional view of a waveguide substrate, wherein the outcoupling grating is arranged on one side of the waveguide substrate;

[0021] Figure 2 is corresponding to Figure 1a A graph showing the brightness perceived by the human eye in an out-coupled grating structure;

[0022] Figures 3a to 3j The schematic diagrams of the structures of the optical waveguide devices in some specific schemes of the utility model are shown;

[0023] Figure 4 is corresponding to Figure 3b An enlarged schematic diagram of the transition boundary zone in ;

[0024] Figure 5It is a curve diagram of brightness perceived by human eyes in a specific solution of the utility model;

[0025] Figures 6a to 6e The cross-sectional views of the outcoupling gratings in some specific embodiments of the present invention are shown. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] It should be noted that when a component is referred to as being “disposed on” another component, it can be directly on the other component or indirectly on the other component.

[0029] It should also be noted that the same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "first", "second", etc. indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0031] The utility model first provides an optical waveguide device, Figures 3a to 3j The optical waveguide devices of some specific structures in the embodiments of the present utility model are exemplified. Figures 3a to 3j, the optical waveguide device includes a waveguide substrate 10 and a coupling-out grating 20 arranged in the coupling-out region of the waveguide substrate 10, the coupling-out grating 20 includes a first region 30, the coupling-out grating 20 includes a second region 40 inside and / or outside the coupling-out grating 20, the first region 30 is adjacent to the second region 40 and has different coupling-out energies (usually a sudden change with a large difference in coupling-out energies, the coupling-out energy in the non-coupling region is 0, and it is still regarded as having coupling-out energy). It should be noted that in the optical waveguide device, a coupling-in grating is usually also arranged in the coupling-in region, and one or more turning regions may also be arranged and a turning grating is arranged in the turning region. The embodiment of the utility model allows the grating to be arranged on only one side of the waveguide substrate to achieve the expected display effect, such as Figure 1b The two sub-divisions are adjacent to each other on one side of the waveguide substrate, thus reducing the process difficulty.

[0032] The outcoupling grating 20 may be a complete grating without sub-partitions, such as Figure 3a , Figure 3j As shown, the outcoupling energy of the outcoupling grating 20 and the total reflection area of ​​the waveguide substrate 10 (the outcoupling energy can be regarded as 0) is abrupt: at this time, the first area 30 is located in the outcoupling grating 20, and the second area 40 is located in the total reflection area adjacent to the outcoupling grating 20.

[0033] The outcoupling grating 20 may be a grating having more than two sub-divisions, such as Figure 3b As shown in 3d to 3i, taking the existence of two sub-partitions as an example, the coupling-out grating 20 includes sub-partition I and sub-partition II. When the coupling-out energies of sub-partition I and sub-partition II are sudden changes: at this time, the first region 30 is located in the coupling-out grating 20, for example, corresponding to sub-partition I, and the second region 40 is also located in the coupling-out grating 20, corresponding to sub-partition II.

[0034] Furthermore, if Figure 3c As shown, when the out-coupling energy of sub-partition I and sub-partition II and the total reflection area of ​​the waveguide substrate 10 adjacent thereto (the out-coupling energy can be regarded as 0) is abrupt: at this time, the first region 30 is located in the out-coupling grating 20, corresponding to sub-partition I; the second region 40 includes a second region 40a corresponding to sub-partition II located in the out-coupling grating 20 and a second region 40b corresponding to the total reflection area located outside the out-coupling grating 20. Of course, it is also possible that the first region 30 is located in the sub-partition II, and the second region includes the second region 40a corresponding to sub-partition I in the out-coupling grating 20 and a second region 40b corresponding to the total reflection area located outside the out-coupling grating 20.

[0035] Therefore, in the first region 30 and the second region 40 in the embodiment of the utility model, the first region 30 is located in the outcoupling grating 20 , and the second region 40 can be located in a total reflection area inside the outcoupling grating 20 and / or outside the outcoupling grating 20 .

[0036] Among them, in the embodiment of the present utility model, refer to Figures 3a to 3j as well as Figure 4 , Figure 4 is corresponding to Figure 3b A transition boundary zone 50 is formed between the first region 30 and the second region 40 .

[0037] In a specific solution, the transition boundary zone 50 is provided with a plurality of first protrusions 61 extending from the edge of the first area 30 toward the second area 40. The first protrusion 61 protrudes toward the outside of the first area 30 (the second area 40), and a first recessed portion 62 is formed between two adjacent first protrusions 61. On the first boundary line 51 connecting the transition boundary zone 50 and the first area 30, a plurality of the first protrusions 61 are sequentially arranged. Thus, the transition boundary zone 50 contains at least a portion of the light outcoupling characteristics of the first area 30 and a portion of the light outcoupling characteristics of the second area 40, so that the outcoupling energy difference between the first area 30 and the second area 40 can be smoothly transitioned, thereby effectively alleviating the existence of the partition boundary perceived by the human eye and improving the user experience.

[0038] In another specific embodiment, Figures 3a to 3j As shown, the transition boundary zone 50 is also provided with a plurality of second protrusions 63 extending from the edge of the second region 40 toward the first region 30. The protrusions are directed to protrude outside the second region 30, and second recesses 64 are formed between the second protrusions 63. On the second boundary line 52 connecting the transition boundary zone 50 and the second region 40, a plurality of second protrusions 63 are sequentially arranged. The transition boundary zone 50 contains both the light outcoupling characteristics of the first region 30 and the light outcoupling characteristics of the second region 40, so that the outcoupling energy difference between the first region 30 and the second region 40 can be further smoothly transitioned. Among them, Figure 3c Seven transition boundary zones 50a-50g are exemplarily marked in the figure. It can be seen from the figure that transition boundary zones are arranged between sub-partition I and sub-partition II, and between sub-partition I and sub-partition II and the total reflection zone of the waveguide substrate 10.

[0039] In the most preferred embodiment, see Figure 4In the transition boundary zone 50, a plurality of the first protrusions 61 constitute a first boundary 51, a third boundary line 53 is formed in the transition boundary zone 50, and a plurality of the second protrusions 63 form a fourth boundary line 54 in the transition boundary zone 50, and the fourth boundary line 54 has a shape that is complementary and meshes with the third boundary line 53. Thus, the light outcoupling performance of the first region 30 and the second region 40 can be complementarily integrated in the transition boundary zone 50, so that the outcoupling energy difference between the first region 30 and the second region 40 has an optimal smooth transition effect.

[0040] It should be noted that, due to the limitation of the manufacturing process, the shape of the fourth boundary line 54 and the third boundary line 53 complementary to each other as described above can be understood as a gap of no more than 50 μm between the fourth boundary line 54 and the third boundary line 53. Figure 4 There is a certain gap between the fourth boundary line 54 shown in FIG. 5 and the third boundary line 53 .

[0041] The first protrusion 61 may be in any shape. In some specific embodiments, the first protrusion 61 may be in a triangular sawtooth shape, such as Figures 3a to 3f The first protrusion 61 may also be a serrated top with a flat edge, such as Figure 3g The first protrusion 61 may also be a sawtooth shape with a circular arc edge at the top, such as Figure 3h Among the plurality of first protrusions 61, all the first protrusions 61 may have the same shape, for example Figures 3a to 3f In the structure shown, all the first protrusions 61 are triangular sawtooth-shaped; Figure 3g In the structure shown, all the first protrusions 61 are serrated with flat edges at the top. In some specific embodiments, the plurality of first protrusions 61 may also have two or more different shapes, such as Figure 3h In the structure shown, a portion of the first protrusion 61 is triangular sawtooth-shaped, and another portion of the first protrusion 61 is sawtooth-shaped with a circular arc edge at the top.

[0042] It should be noted that the shape of the second protrusion 63 is limited as follows: when the fourth boundary line 54 is complementarily engaged with the third boundary line 53, the shape of the second protrusion 63 is set based on the shape of the first protrusion 61; among the plurality of second protrusions 63, all the second protrusions 63 may have the same shape, or there may be two or more different shapes, as long as the second protrusion 63 corresponds to the first recessed portion 62 between the first protrusions 61, and the first protrusion 61 corresponds to the second recessed portion 64 between the second protrusions 63.

[0043] Among them, Figure 4 As shown, the vertical distance between the first boundary line 51 and the second boundary line 52 is the width of the transition boundary zone 50, and the width D of the transition boundary zone 50 is set to be greater than 1 mm, preferably set to 1 mm to 4 mm. Further, in the extension direction of the transition boundary zone 50, the transition boundary zone 50 has a uniform width, or the width of the transition boundary zone 50 gradually decreases or increases, or the width of the transition boundary zone 50 first decreases and then increases, or the width of the transition boundary zone 50 first increases and then decreases.

[0044] It should be noted that when the transition boundary zone 50 is a non-closed figure that is not connected at the beginning and the end, that is, the first boundary line 51 and the second boundary line 52 are non-closed broken lines, for example Figures 3a to 3i The transition boundary band 50 shown in the figure, at this time, the extending direction of the transition boundary band 50 can be understood as the direction from any end of the transition boundary band 50 toward the other end. Figure 3b The transition boundary zone 50 shown may be understood as extending from the left end toward the right end in the view, or may be understood as extending from the right end toward the left end in the view; for example Figure 3c The transition boundary band 50c shown can be understood as extending from the upper end to the lower end as shown in the figure, or can be understood as extending from the lower end to the upper end as shown in the figure. When the transition boundary band 50 is a closed figure connected end to end, that is, the first boundary line 51 and the second boundary line 52 are closed curves, the extension direction of the transition boundary band 50 can be understood as a clockwise direction or a counterclockwise direction. For example Figure 3j The transition boundary band 50 shown here can be understood as extending in a clockwise direction or a counterclockwise direction with any first protrusion 61 or first depression 62 as a starting point (the end point coincides with the starting point).

[0045] Among them, see Figures 3a to 3j as well as Figure 4 As shown, in the transition boundary zone 50, the length of any one of the first protrusions 61 on the first boundary line 51 is L i The length of any one of the second protrusions 63 on the second boundary line 52 is L j , where L i and L j They are all no larger than the diameter of the pupil of the human eye, preferably no larger than 4 mm, and more preferably set to no larger than 2 mm.

[0046] In some specific embodiments, in the extension direction along the first boundary line 51, the length L of the plurality of first protrusions 61 is i Equal, such as Figure 3a to Figure 3c , 3e and Figure 3g to Figure 3iIn some other specific embodiments, the length L of the plurality of first protrusions 61 is i They can also be unequal, such as Figure 3d , 3f and Figure 3j Similarly, in the extension direction along the second boundary line 52, the length L of the plurality of second protrusions 63 is j Can be equal, such as Figure 3b , 3c and Figure 3g In some other specific embodiments, the length L of the plurality of second protrusions 63 is j They can also be unequal, such as Figure 3d to Figure 3f as well as Figure 3h and Figure 3i It should be noted that, regardless of whether they have the same length or different lengths, the length L of the first protrusion 61 on the first boundary line 51 is i and the length L of the second protrusion 63 on the second boundary line 52 j They should not be larger than the diameter of the human pupil.

[0047] As a preferred solution, Figure 3d In the structure shown in the figure, in the extension direction along the first boundary line 51, the length L of the plurality of first protrusions 61 is i First decrease and then increase.

[0048] As a preferred solution, Figure 3e and Figure 3h In the structure shown, for any one of the first protrusions 61, the line connecting the two endpoints located on the first boundary line 51 is taken as the base, the vertex or the top tangent point located outside the first boundary line 51 is taken as the vertex, and the vertical distance between the vertex and the perpendicular bisector of the base is defined as the vertex offset, and the vertex offsets of multiple first protrusions 61 gradually change.

[0049] It should be noted that if Figure 3h In the embodiment, the top of some of the first protrusions 61 is in an arc shape, and the vertex is the top tangent point. Figure 3g The flat edge shape parallel to the second boundary line 52 shown in FIG. 1 is taken as the vertex. Figure 3e For example, if the vertex is on the perpendicular bisector of the base, the vertex offset is considered to be zero, if the vertex is on the left side of the perpendicular bisector of the base, the vertex offset is considered to be a negative value, and if the vertex is on the right side of the perpendicular bisector of the base, the vertex offset is considered to be a positive value. Therefore, Figure 3eIn the structure, along the extension direction of the first boundary line 51, the vertex offsets of the plurality of first protrusions 61 gradually change from negative values ​​to positive values. The positive and negative values ​​of the vertex offsets are not necessarily defined by "left" or "right", for example Figure 3c In the transition boundary zone 50c, the positive and negative of the vertex offset are defined as "up" and "down". More generally, it can be defined according to the extending direction of the transition boundary zone, as long as the positive and negative can be distinguished.

[0050] As another preferred solution, Figure 3f In the structure shown, in the extension direction of the transition boundary zone 50 , the width of the transition boundary zone 50 increases first and then decreases.

[0051] In the above preferred embodiments, when the shape and / or spacing and / or width of the transition boundary band of the protrusions at different positions vary, the perceived brightness differences at different positions are differentiated and regulated, and the regulation methods and parameters are increased, which is beneficial to the human eye's perception of the brightness / color uniformity of the image.

[0052] Figure 5 The utility model corresponds to Figure 3b Graph of human eye perceived brightness for the structures shown. Figure 5 The gray dotted line in Figure 3b In the structure shown, the human eye perceives the brightness curve when it moves from point A to point C via point B; Figure 5 The black dashed line in Figure 2 The human eye perceived brightness curve is shown. By comparing the two, it can be seen that after setting the transition boundary band, when the pupil is located at point B, the slope of the perceived brightness change will slow down, indicating that the coupling energy difference between the first area and the second area perceived by the human eye can transition smoothly, that is, it is not easy to perceive the existence of the boundary, thereby improving the uniformity of the brightness perceived by the human eye.

[0053] In the embodiment of the utility model, the coupling grating 20 can be a one-dimensional grating or a two-dimensional grating. As a preferred solution, when the coupling grating 20 is a one-dimensional grating, its grating period can be 300nm to 600nm. When the coupling grating 20 is a two-dimensional grating, its grating period in the two-dimensional direction can be 300nm to 700nm respectively, and the periods in the two directions can be the same or different.

[0054] In a specific solution, the outcoupling grating 20 can be implemented in the form of a surface relief grating. Figures 6a to 6e 2 shows a cross-sectional view of the outcoupling grating 20 in some specific embodiments of the present invention. Figure 6a This is a diagram of the structure of a relief grating surrounded by straight grooves. Figure 6b This is a diagram of the structure of the relief grating with helical teeth. Figure 6c This is a diagram of the structure of the embossed grating with a blazed envelope. Figure 6d This is a diagram of the structure of the relief grating with step envelope. Figure 6e Illustration of the structure of a relief grating surrounded by a curved surface.

[0055] In an embodiment of the utility model, the outcoupling grating 20 is composed of at least two optical materials with different optical properties, and the optical properties include refractive index, and / or absorption properties, and / or birefringence properties. Therefore, if the grating is in the air, the air is also considered an optical material. For materials without birefringence, the optical properties of the material can be comprehensively described by the refractive index and absorption properties. When the two optical materials differ mainly in the refractive index, the grating can be divided into a high refractive index part and a low refractive index part, the refractive index of the high refractive index part is between 1.5 and 3.0, and the refractive index of the low refractive index part is between 1.0 and 1.5.

[0056] In some specific schemes, when the outcoupling grating 20 has more than two sub-divisions, the sub-divisions may have different grating period sizes and / or different grating period directions and / or different microstructure unit morphologies and / or groove depths.

[0057] In the embodiment of the present invention, the waveguide substrate 10 can be made of glass, resin, plastic, transparent ceramic, SiC, etc., or a combination of several thereof.

[0058] Furthermore, the utility model also provides a display device, which is, for example, an augmented reality (AR) display device or an extended reality (XR) display device or a head-up display device (HUD). The display device includes an imaging device and an optical waveguide device provided in the above embodiment of the utility model, wherein the imaging device is used to generate image light (light carrying virtual image information), which is coupled into the waveguide substrate by an in-coupling grating, transmitted to an out-coupling grating via the waveguide substrate, and then coupled out of the waveguide substrate by the out-coupling grating, and transmitted to the user's field of view, so that the human eye can observe the corresponding image information.

[0059] In summary, the optical waveguide device and the display device provided by the above embodiments of the present invention form a transition boundary zone between the first area and the second area with different outcoupling energies in the outcoupling area, and the transition boundary zone contains at least a part of the light outcoupling characteristics of the first area, so that the outcoupling energy difference between the first area and the second area can be smoothly transitioned, thereby effectively alleviating the existence of the partition boundary perceived by the human eye and improving the user experience.

[0060] While the present invention has been shown and described with reference to the particular embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the claims and their equivalents.

Claims

1. An optical waveguide device, comprising a waveguide substrate and an outcoupling grating arranged on the waveguide substrate, characterized in that: The outcoupling grating includes a first region inside, and the outcoupling grating and / or the outcoupling grating includes a second region outside, the first region and the second region are adjacent to each other and have different outcoupling energies, and a transition boundary zone is formed between the first region and the second region; Among them, the transition boundary zone is provided with a plurality of first protrusions extending from the edge of the first area toward the second area; on the first boundary line connecting the transition boundary zone and the first area, the plurality of first protrusions are arranged in sequence and a first recessed portion is formed between any two adjacent first protrusions.

2. The optical waveguide device according to claim 1, characterized in that The transition boundary zone is also provided with a plurality of second protrusions extending from the edge of the second region toward the first region; on a second boundary line connecting the transition boundary zone and the second region, the plurality of second protrusions are arranged in sequence and a second recessed portion is formed between any two adjacent second protrusions; The plurality of first protrusions form a third boundary line in the transition boundary zone, and the plurality of second protrusions form a fourth boundary line in the transition boundary zone. The fourth boundary line has a shape that is complementary to and meshes with the third boundary line.

3. The optical waveguide device according to claim 2, characterized in that A gap between the fourth boundary line and the third boundary line is no greater than 50 μm.

4. The optical waveguide device according to claim 2, characterized in that The vertical distance between the first boundary line and the second boundary line is the width of the transition boundary zone, and the width of the transition boundary zone is 1 mm to 4 mm.

5. The optical waveguide device according to claim 4, characterized in that In the extension direction of the transition boundary band, the transition boundary band has a uniform width, or the width of the transition boundary band gradually decreases or increases, or the width of the transition boundary band first decreases and then increases, or the width of the transition boundary band first increases and then decreases.

6. The optical waveguide device according to claim 2, characterized in that The first protrusion is in a triangular sawtooth shape or a sawtooth shape with a flat edge or a circular arc edge at the top.

7. The optical waveguide device according to claim 6, characterized in that Among the plurality of first protrusions, all the first protrusions have the same shape or have two or more different shapes.

8. The optical waveguide device according to any one of claims 2 to 7, characterized in that: The length of the first protrusion on the first boundary line and the length of the second protrusion on the second boundary line are both no greater than the diameter of the pupil of a human eye.

9. The optical waveguide device according to claim 8, characterized in that The length of the first protrusion on the first boundary line and the length of the second protrusion on the second boundary line are both no greater than 4 mm.

10. The optical waveguide device according to claim 8, characterized in that In the extension direction along the first boundary line, the lengths of multiple first protrusions are equal, or the lengths of multiple first protrusions first decrease and then increase, or the lengths of multiple first protrusions first increase and then decrease; and / or, for any first protrusion, the line connecting the two end points located on the first boundary line is taken as the base, the vertex or the top tangent point located outside the first boundary line is taken as the vertex, and the vertical distance between the vertex and the perpendicular bisector of the base is defined as the vertex offset, and the vertex offsets of multiple first protrusions gradually change.

11. A display device, characterized in that: The optical waveguide device comprises the optical waveguide device as claimed in any one of claims 1 to 10.

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