Diffraction optical waveguide and display device

Abstract

According to the diffraction optical waveguide and the display device provided by the utility model, the supporting structure is arranged between the waveguide sheet and the protection sheet, and the contact mode between the protection sheet and the waveguide sheet is changed through the annular and / or point-shaped supporting structure, so that the large-area adhesion between the protection sheet and the waveguide sheet is avoided, and the Newton ring phenomenon is reduced; moreover, the contact mode in the utility model can improve the deformation state of the protection sheet when the protection sheet is pressed, is more beneficial to deformation recovery, prevents long-term adhesion of the protection sheet and the waveguide sheet, further reduces the Newton ring phenomenon, improves the display effect of the existing lens, and has unexpected technical effects.

Description

Technical Field

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

[0002] With the development of augmented reality technology, the requirements for smart glasses are getting higher and higher. In order to improve the color display effect and ensure the thinness of smart devices, the waveguide components are usually thinned or replaced with lighter materials. Due to the thinness and flexibility of this type of cover, while achieving lightweight, it also brings new problems to the waveguide components, such as the overall strength of the waveguide components is poor, and the resistance to falling is poor, especially when the waveguide components are deformed by pressure or collision during use, resulting in Newton ring phenomenon, which in turn affects the display effect. For such problems, how to avoid the occurrence of this phenomenon is an urgent problem that needs to be solved.

[0003] The utility model intends to solve the above technical problems, provide a new diffraction light waveguide and display device, reduce the generation of Newton rings in the waveguide, and improve the display effect of the waveguide. Utility Model Content

[0004] The embodiments of the utility model provide a diffraction optical waveguide and a display device, which solve the problems existing in the prior art and improve the display effect of the waveguide.

[0005] The utility model claims protection for a diffraction optical waveguide, comprising at least one layer of waveguide sheet and at least one layer of protection sheet, wherein the waveguide sheet and the protection sheet are stacked, a grating structure is arranged on a surface of the waveguide sheet on one side facing the protection sheet, the grating structure comprises an in-coupling grating and an out-coupling grating, projection light of an optical machine is coupled in by the in-coupling grating and undergoes total reflection in the waveguide sheet and is coupled out by the out-coupling grating, a grating structure area is formed by areas where the in-coupling grating and the out-coupling grating are located and areas connected, a support structure is arranged outside the grating structure area, the support structure surrounds the grating structure area; the cross section of the support structure is annular and / or dot-shaped, and the support structure is configured not to affect the optical path of the waveguide sheet.

[0006] Furthermore, the annular supporting structure is composed of arc and / or straight line structures.

[0007] Furthermore, the point-shaped support structure includes a plurality of support units.

[0008] Preferably, the annular support structure includes a plurality of closed structures.

[0009] Furthermore, the point-shaped support structures are scatteredly arranged on the surface of the waveguide plate facing the protection plate.

[0010] Practically, the spacing between the point-shaped support structures ranges from 0.2 mm to 20 mm.

[0011] Furthermore, the shapes and heights of the point-shaped support structures at different positions may be the same or different.

[0012] Furthermore, the height of the support structure is greater than 400 nm.

[0013] In practice, the height of the supporting structure is lower than the height of the connecting member and higher than the height of the grating structure, and the connecting member is used to connect the waveguide plate and the protection plate.

[0014] Further, optionally, an optical anti-reflection film is provided on any surface of the protection sheet.

[0015] Furthermore, the support structure includes a ring-shaped support structure and a point-shaped support structure.

[0016] The waveguide sheet may be a resin sheet or a glass sheet; the protection sheet may be a resin sheet or a glass sheet.

[0017] In practice, a diffraction optical waveguide also includes at least two layers of waveguide plates and at least one layer of protective plate, a grating structure is arranged on the surface of each layer of waveguide plates facing the protective plate, and the supporting structure is arranged outside the grating structure area on each layer of waveguide structure, and the supporting structure surrounds the grating structure area.

[0018] At the same time, the present application seeks protection for a display device comprising any of the diffractive optical waveguides described above.

[0019] It can be known that the display device is AR glasses or HUD.

[0020] The present application provides a new diffraction optical waveguide and display device, which provides a support structure between the waveguide sheet and the protective sheet, and changes the contact mode between the protective sheet and the waveguide sheet through the ring-shaped and / or point-shaped support structure, thereby avoiding large-area adhesion between the two and reducing the occurrence of Newton ring phenomenon. In addition, the contact mode between the support structure and the waveguide sheet in the present application can improve the deformation state of the protective sheet when it is under pressure, making it more conducive to restoring the deformation, and can prevent the protective sheet and the waveguide sheet from "long-term adhesion" and further reduce the occurrence of Newton ring phenomenon, thereby improving the display effect in the existing lens, and having unexpected technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of a diffractive optical waveguide according to Embodiment 1 of the present utility model;

[0023] Figure 2 A schematic diagram of a diffractive optical waveguide according to Embodiment 1 of the present utility model;

[0024] Figure 3 A schematic diagram of a diffractive optical waveguide according to Embodiment 2 of the present utility model;

[0025] Figure 4 A schematic diagram of a diffractive optical waveguide according to Embodiment 2 of the present utility model;

[0026] Figure 5 A schematic diagram of a diffractive optical waveguide according to Embodiment 2 of the present utility model;

[0027] Figure 6 A schematic diagram of a diffractive optical waveguide according to Embodiment 2 of the present utility model;

[0028] Figure 7 A schematic diagram of a diffractive optical waveguide according to Embodiment 3 of the present utility model;

[0029] Figure ID:

[0030] 10: protective plate; 20: connector; 30: waveguide plate; 40: out-coupling grating; 50: in-coupling grating; 200: supporting structure DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] The utility model claims protection for a diffraction optical waveguide, such as Figure 1 , 2 As shown, the optical machine comprises at least one layer of waveguide sheet 30 and at least one layer of protective sheet 10, the waveguide sheet 30 and the protective sheet 10 are stacked, the waveguide sheet 30 and the protective sheet 10 are connected by a connecting member 20, a grating structure is arranged on the surface of the waveguide sheet 30 facing the protective sheet 10, the grating structure comprises an in-coupling grating 50 and an out-coupling grating 40, the projection light of the optical machine is coupled in by the in-coupling grating 40 and is totally reflected in the waveguide sheet 30 and is coupled out to the projection area by the out-coupling grating 40, and the area connected by the in-coupling grating 50 and the out-coupling grating 40 forms a grating structure area (as shown in FIG. Figure 1 A support structure 200 is arranged outside the grating structure area, and the support structure 200 surrounds the grating structure area; Figure 1 and Figure 3 The top view can be defined as a cross-section of the support structure being ring-shaped and / or dot-shaped, and the support structure 200 has the same or different shapes and heights at different positions, and the support structure 200 is configured not to affect the optical path of the waveguide.

[0034] Further, in embodiment 1, Figure 1 Only one embodiment of the support structure 200 having a ring-shaped cross section is shown. It is understood that "ring-shaped" can be understood as being composed of arc and / or straight line structures to support the protective sheet and prevent it from deforming. Figure 2 , which is the cross section of the support structure 200. The cross section of the support structure is rectangular. Of course, it can also be other shapes, such as trapezoidal, inverted trapezoidal, arc structure, etc. This application does not make any limitation on this, and all are within the concept of this application. Further, in Example 2, Figure 3An embodiment in which the support structure 200 is in the shape of a point is shown. The point-shaped support structure includes a plurality of support units. The support structure 200 is scatteredly arranged on the surface of the waveguide plate facing the protective plate, and the shape, size, height, position and other parameters of each support unit may be different, forming "chaotic" and disordered support units. The number, position and other limitations of the support units are appropriately selected based on the situation in which the diffraction optical waveguide produces the Newton ring phenomenon.

[0035] The spacing of the point-shaped support structures ranges from 0.2 mm to 20 mm, and the point-shaped support structures are evenly or unevenly arranged on the surface of the waveguide sheet facing the protective sheet. Figure 4 The support structure 200 includes a plurality of support units, which are point-shaped and have different heights, widths and positions at different positions. The purpose of such a setting is to facilitate that when the protective sheet is pressed at different positions, the contact mode can be changed due to the effect of the support structure when it contacts the support structure, and the deformation can be restored. Different positions can restore the deformation; Figure 4 As shown, the heights of the plurality of support units of the support structure 200 increase successively and the widths increase successively along the direction away from the grating structure toward the connecting member 20 .

[0036] It is known that, based on the knowledge in this field, Figure 5 As shown, the heights of several support units of the support structure 200 are successively reduced along the direction away from the grating structure toward the connecting member 20; or alternatively, the heights of several support units of the support structure 200 at one end are successively increased along the direction away from the grating structure toward the connecting member 20, and the heights of the other end opposite thereto are successively reduced, or several support structure units of different heights are alternately arranged in sequence, all of which belong to the embodiments of the present application.

[0037] Furthermore, the height of the support structure 200 is much greater than the height of the grating structure, and can be limited to be greater than 400nm, so that the support structure can help the protection sheet 10 to quickly restore its deformation, while preventing the compressive deformation of the protection sheet from damaging the grating structure area, thereby affecting the performance of the diffraction optical waveguide; further, the height of the support structure can be limited to be less than the gap distance when the waveguide sheet and the protective sheet are connected, so as to prevent the height of the support structure from affecting the connection performance of the waveguide.

[0038] Further, in the third embodiment, the present application provides a diffraction optical waveguide, including at least two layers of waveguide sheets 30 and at least one layer of protective sheet 10, the waveguide sheets 30 and the protective sheet 10 are stacked, and the waveguide sheets 30 and the protective sheet 10 are connected by a connector 20, and a grating structure is arranged on the surface of each layer of waveguide sheet 30 facing the protective sheet 10, the grating structure includes a coupling-in grating 50 and a coupling-out grating 40, and the area connected by the coupling-in grating 50 and the coupling-out grating 40 forms a grating structure area, and a support structure 200 is arranged outside the grating structure area on each layer of the waveguide structure, and the support structure 200 surrounds the grating structure area; and in combination with the above-mentioned embodiments, it can be defined that the support structure is ring-shaped and / or dot-shaped. The support structure adopts the structure of any of the above-mentioned embodiments, and the present application does not make any limitation on this, and it is within the scope of protection requested by the present application without departing from the essence of the present application.

[0039] It can be known that the waveguide sheet can be a resin sheet or a glass sheet; the protection sheet can be a resin sheet or a glass sheet.

[0040] It should be noted that the definition of not affecting the optical path in the waveguide as defined in this application means not bringing adverse effects to the original coupling, transmission, and coupling-out optical paths in the waveguide, thereby producing results worse than the original performance. However, support structures that can bring favorable effects also fall within the scope of protection of this application.

[0041] In some embodiments of the present application, the grating structure also includes a turning grating, and the grating structure area at this time is defined as the area of ​​the light path connected to the locations of the coupling-in grating, the turning grating, and the coupling-out grating. Of course, in other embodiments, the grating structure may also include other functional gratings, such as a recycling grating, etc., and the grating structure area at this time is defined as the area where the grating structure is located and the area of ​​the light path connected to the locations of the gratings in the grating structure.

[0042] At the same time, the present application claims protection for a display device comprising any of the aforementioned diffractive optical waveguides.

[0043] It can be known that the display device is AR glasses or HUD.

[0044] The present application provides a new diffraction optical waveguide and display device, which provides a support structure between the waveguide sheet and the protective sheet, and changes the contact mode between the protective sheet and the waveguide sheet through the ring-shaped and / or point-shaped support structure, thereby avoiding large-area adhesion between the two and reducing the occurrence of Newton ring phenomenon; and the contact mode in the present application can improve the state of deformation of the protective sheet when under pressure, so that it can be more conducive to restoring the deformation, and can prevent the protective sheet and the waveguide sheet from "long-term adhesion" and further reduce the occurrence of Newton ring phenomenon, thereby improving the display effect in the existing lens, and having unexpected technical effects.

[0045] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A diffractive optical waveguide, characterized in that: The optical fiber optical fiber comprises at least one layer of waveguide plate and at least one layer of protective plate, wherein the waveguide plate and the protective plate are stacked, and a grating structure is arranged on a surface of the waveguide plate facing the protective plate, wherein the grating structure comprises an in-coupling grating and an out-coupling grating, and projection light of an optical machine is coupled in by the in-coupling grating and is totally reflected in the waveguide plate and then coupled out by the out-coupling grating, and a grating structure area is formed by the area where the in-coupling grating and the out-coupling grating are located and the connected area, and a supporting structure is arranged outside the grating structure area, and the supporting structure surrounds the grating structure area; the cross section of the supporting structure is annular and / or dot-shaped, and the supporting structure is configured not to affect the optical path of the waveguide plate.

2. The diffractive optical waveguide according to claim 1, characterized in that: The annular supporting structure is composed of arc and / or straight line structures.

3. The diffractive optical waveguide according to claim 1, characterized in that: The point-shaped supporting structure includes a plurality of supporting units.

4. The diffractive optical waveguide according to claim 2, characterized in that: The annular supporting structure includes a plurality of closed structures.

5. The diffractive optical waveguide according to claim 2, characterized in that: The point-shaped supporting structures are scatteredly arranged on the surface of the waveguide plate facing the protection plate.

6. The diffractive optical waveguide according to claim 1 or 5, characterized in that: The spacing between the point-shaped support structures ranges from 0.2 mm to 20 mm.

7. The diffractive optical waveguide according to claim 1, characterized in that: The height of the support structure is greater than 400 nm.

8. The diffractive optical waveguide according to claim 1, characterized in that: The height of the supporting structure is lower than the height of the connecting member and higher than the height of the grating structure. The connecting member is used to connect the waveguide plate and the protection plate.

9. The diffractive optical waveguide according to claim 1, characterized in that: It comprises at least two layers of waveguide plates and at least one layer of protection plate, a grating structure is arranged on the surface of each layer of waveguide plates facing the protection plate, the support structure is arranged outside the grating structure area on each layer of waveguide structure, and the support structure surrounds the grating structure area.

10. A display device, characterized in that: The diffractive optical waveguide comprises the diffractive optical waveguide according to any one of claims 1 to 9.

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