Optical waveguide system, display device, and electronic apparatus

Abstract

The invention relates to an optical waveguide system, a display device and electronic equipment. The optical waveguide system includes: a display module; the first light incident region is provided with a first Bragg grating, and the second light incident region is provided with a second Bragg grating; the polarization module is used for converting the display light emitted by the display module into first polarized light; the polarization optical splitter is located between the polarization module and the optical waveguide, and the polarization optical splitter is used for converting the first polarized light into first sub-display light and second sub-display light; the first sub-optical path is located between the polarization beam splitter and the first light incident area, and the optical waveguide system comprises a first phase delayer, a first reflector and a first Bragg grating which are located on the first sub-optical path; and the second sub-optical path is located between the polarization beam splitter and the second light incident area, and the optical waveguide system comprises a second phase delayer, a second reflector and a second Bragg grating which are located on the second sub-optical path. According to the invention, the problem of non-uniform pictures caused by optical waveguide process errors can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light waveguide system, a display device and an electronic equipment. BACKGROUND

[0002] With the development of augmented reality technology, AR headsets, AR glasses and vehicle HUD (head-up display) are gradually recognized as the next generation of computing and display platforms, and more and more manufacturers are investing a lot of resources in research and development. The key optical components of these display devices are the light machines that generate images and the light transmission modules that transmit images to the eyes. The light transmission module is the most critical part, which directly affects the volume, imaging quality and viewing comfort of these display devices. The mainstream light transmission module in the industry is represented by a light waveguide device.

[0003] However, the existing technology has the problem of uneven picture caused by light waveguide process error. SUMMARY

[0004] Therefore, it is necessary to provide a light waveguide system, a display device and an electronic equipment to solve the problem of uneven picture caused by light waveguide process error in the prior art.

[0005] According to a first aspect of the present application, a light waveguide system is provided, comprising:

[0006] a display module;

[0007] a light waveguide comprising a first end and a second end arranged opposite to each other, a first light-in area on a side surface of the first end, and a second light-in area on a side surface of the second end, the first light-in area having a first Bragg grating, and the second light-in area having a second Bragg grating;

[0008] a polarization module located on the light-out side of the display module and between the display module and the light waveguide in the light propagation path, the polarization module being configured to convert the display light emitted by the display module into first polarized light;

[0009] a polarization beam splitter located between the polarization module and the light waveguide in the light propagation path, the polarization beam splitter being configured to convert the first polarized light into first sub-display light and second sub-display light, wherein after the first polarized light passes through the polarization beam splitter, one of the first sub-display light and the second sub-display light is P light, and the other is S light;

[0010] The first sub-light path, between the polarization beam splitter and the first light-in area on the light propagation path, the optical waveguide system comprises a first phase retarder, a first mirror and the first Bragg grating arranged in sequence on the first sub-light path on the light propagation path, the first sub-display light enters the interior of the optical waveguide at the first light-in area after passing through the first sub-light path;

[0011] The second sub-light path, between the polarization beam splitter and the second light-in area on the light propagation path, the optical waveguide system comprises a second phase retarder, a second mirror and the second Bragg grating arranged in sequence on the second sub-light path on the light propagation path, the second sub-display light enters the interior of the optical waveguide at the second light-in area after passing through the second sub-light path.

[0012] In some embodiments, the polarization module comprises a polaroid;

[0013] The polarization beam splitter comprises a polarizing beam splitter;

[0014] The first phase retarder comprises a first electrically controllable variable phase retarder, and the second phase retarder comprises a second electrically controllable variable phase retarder;

[0015] The first Bragg grating is a first Bragg polarization selection grating, and the second Bragg grating is a second Bragg polarization selection grating;

[0016] The first sub-display light enters the interior of the optical waveguide at the first light-in area after sequentially passing through the first electrically controllable variable phase retarder, the first mirror and the first Bragg polarization selection grating in the first sub-light path;

[0017] The second sub-display light enters the interior of the optical waveguide at the second light-in area after sequentially passing through the second electrically controllable variable phase retarder, the second mirror and the second Bragg polarization selection grating in the second sub-light path.

[0018] In some embodiments, the optical waveguide comprises a first surface and a second surface arranged oppositely, and a third surface and a fourth surface arranged oppositely, the third surface connects the first surface and the second surface at the first end, and the fourth surface connects the first surface and the second surface at the second end;

[0019] The first light-in area is located on the first surface, and the second light-in area is located on the second surface or the fourth surface.

[0020] In some embodiments, the image gradient of the first sub-display light after passing through the first Bragg grating is opposite to the image gradient of the second sub-display light after passing through the second Bragg grating; and / or,

[0021] The transmission directions of the first sub-display light and the second sub-display light in the optical waveguide are opposite.

[0022] In some embodiments, the first sub-display light has a first brightness after passing through the first Bragg grating and entering the inside of the optical waveguide, and the second sub-display light has a second brightness after passing through the second Bragg grating and entering the inside of the optical waveguide, and the first brightness is equal to the second brightness.

[0023] In some embodiments, the first sub-display light has a first brightness after passing through the first Bragg grating and entering the inside of the optical waveguide, and the second sub-display light has a second brightness after passing through the second Bragg grating and entering the inside of the optical waveguide, and the first brightness is equal to the second brightness.

[0024] The initial angle of the polarization module is P, and the angle to be adjusted of the polarization module is θ;

[0025] Before the polarization module is adjusted, the first brightness is Y, and the second brightness is X;

[0026] The angle of the polarization module can be adjusted according to the following formula, so that the first brightness is equal to the second brightness after the polarization module is adjusted;

[0027] , .

[0028] In some embodiments, the first phase retarder comprises a first electrically controllable variable phase retarder, and the second phase retarder comprises a second electrically controllable variable phase retarder;

[0029] The first electrically controllable variable phase retarder has a first phase retardation state, and the first sub-display light is S light after passing through the first electrically controllable variable phase retarder and entering the inside of the optical waveguide after passing through the first Bragg grating;

[0030] The second electrically controllable variable phase retarder has a second phase retardation state, and the second sub-display light is S light after passing through the second electrically controllable variable phase retarder and entering the inside of the optical waveguide after passing through the second Bragg grating.

[0031] According to a second aspect of the present application, based on the same application concept, a display device is provided, comprising the optical waveguide system according to any one of the above.

[0032] In some embodiments, the display module comprises a digital micro-mirror device and a plurality of light-emitting diodes, the digital micro-mirror device controls the plurality of light-emitting diodes to have a first light-emitting phase and a first off phase, the first light-emitting phase and the first off phase are alternately transformed;

[0033] The first phase retarder is a first electrically controllable variable phase retarder, and the second phase retarder is a second electrically controllable variable phase retarder.

[0034] The first Bragg grating is a first Bragg polarization selection grating, and the second Bragg grating is a second Bragg polarization selection grating.

[0035] In the first light-emitting phase, the first electrically controllable variable phase retarder has a third phase retardation state, and the first sub-display light enters the inside of the optical waveguide after passing through the first Bragg polarization selection grating; in the first light-emitting phase, the second electrically controllable variable phase retarder has a fourth phase retardation state, and the second sub-display light enters the inside of the optical waveguide after passing through the second Bragg polarization selection grating.

[0036] In the first off phase, the first electrically controllable variable phase retarder has a fifth phase retardation state, and the first sub-display light is blocked by the first Bragg polarization selection grating; the second electrically controllable variable phase retarder has a sixth phase retardation state, and the second sub-display light is blocked by the second Bragg polarization selection grating.

[0037] According to a third aspect of the present application, based on the same application concept, an electronic device is provided, comprising the display device of any one of the above.

[0038] In the embodiments of the present application, the optical waveguide further comprises an out-light area, the first sub-display light and the second sub-display light are both emitted at the out-light area after being transmitted in the inside of the optical waveguide, the first sub-display light has a first sub-picture, the second sub-display light has a second sub-picture, and the first sub-display light and the second sub-display light combine to form a final picture after being emitted at the out-light area after being transmitted in the inside of the optical waveguide. Since the first light-in area is located at the first end, the second light-in area is located at the second end, and the first end and the second end are two end parts of the optical waveguide arranged oppositely, even if the first sub-display light / first sub-picture and / or the second sub-display light / second sub-picture have uneven defects after being transmitted in the optical waveguide, but the uneven defects of the first sub-display light / first sub-picture and the second sub-display light / second sub-picture are mutually symmetrical, the image gradients are opposite, and they are mutually compensated, so that a final picture with uniform picture and no defects can be formed, thereby solving or improving the problem of uneven picture caused by process errors of the optical waveguide. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments or the example embodiments of the present application, the drawings needed to be used in the description of the embodiments or the example embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0040] Figure 1 A structural schematic diagram of an optical waveguide system provided by an embodiment of the present application.

[0041] Figure 2 A schematic diagram of a first display light transmission path of an optical waveguide system provided by an embodiment of the present application.

[0042] Figure 3 A schematic diagram of a second display light transmission path of an optical waveguide system provided by an embodiment of the present application.

[0043] Figure 4 A schematic diagram of a picture improvement process of an optical waveguide system provided by an embodiment of the present application.

[0044] Figure 5 A schematic diagram of a third display light transmission process of an optical waveguide system provided by an embodiment of the present application.

[0045] Figure 6 A schematic diagram of a working stage of a display device provided by an embodiment of the present application.

[0046] Reference signs: optical waveguide system 100; display module 10; optical waveguide 60; polarization module 20; polarization beam splitter 30; first sub-light path 101; second sub-light path 102; first end 60a; second end 60b; first light-in area 60r1; second light-in area 60r2; first phase retarder 41; first mirror 51; first Bragg grating 60g1; second phase retarder 42; second mirror 52; second Bragg grating 60g2;

[0047] Display light G0; first polarized light G1; first sub-display light G21; second sub-display light G22; first sub-picture H1; second sub-picture H2; final picture H12; first surface 601; second surface 602; third surface 603; fourth surface 604; light-out area 60c1; first light-emitting stage T1; first closing stage T2; red light-emitting diode RLED; green light-emitting diode GLED; blue light-emitting diode BLED; first light-expanding area 61; second light-expanding area 62. DETAILED DESCRIPTION

[0048] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0049] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In this application, unless otherwise explicitly specified and limited, if there is a description such as "on" or "under" or the like between a first feature and a second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature can be "below", "under" and "under" the second feature, which can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0054] In addition, the drawings are not drawn to scale 1:1, and the relative sizes of the elements are only drawn by example in the drawings, not necessarily according to the true scale.

[0055] Various modifications and changes can be made to the present application in the application without departing from the spirit or scope of the application, which will be apparent to those skilled in the art. Therefore, the present application is intended to cover the modifications and changes of the present application falling within the scope of the corresponding claims (claimed technical solutions) and their equivalents. It should be noted that the embodiments provided by the embodiments of the present application can be combined with each other without contradiction.

[0056] In the prior art, there are process errors of optical waveguide that cause uneven pictures. For example, when manufacturing the structure of the optical waveguide by embossing technology, there are process fluctuations of the optical waveguide structure caused by the uneven pictures, thereby causing uneven pictures. For example, the display device using the optical waveguide causes display unevenness, black picture color difference and other problems due to the existence of stray light.

[0057] Based on the above problems, the present application provides an optical waveguide system, a display device and an electronic equipment.

[0058] Please refer to Figures 1 to 6 . Figure 1 A structural schematic diagram of an optical waveguide system provided by an embodiment of the present application. Figure 2 A schematic diagram of a first display light transmission path of an optical waveguide system provided by an embodiment of the present application. Figure 3A schematic diagram of a second display light transmission path of an optical waveguide system provided for an embodiment of the present application. Figure 4 A schematic diagram of a picture improvement process of an optical waveguide system provided for an embodiment of the present application.

[0059] Figure 5 A schematic diagram of a third display light transmission process of an optical waveguide system provided for an embodiment of the present application. Figure 6 A schematic diagram of a working stage of a display device provided for an embodiment of the present application.

[0060] In a first aspect, referring to Figures 1 to 6 The present application provides an optical waveguide system 100, which comprises a display module 10, an optical waveguide 60, a polarization module 20, a polarization beam splitter 30, a first sub-light path 101 and a second sub-light path 102. The optical waveguide 60 comprises a first end 60a and a second end 60b arranged oppositely, has a first light-in area 60r1 on one side surface of the first end 60a, and has a second light-in area 60r2 on one side surface of the second end 60b. The first light-in area 60r1 has a first Bragg grating 60g1, and the second light-in area 60r2 has a second Bragg grating 60g2. The polarization module 20 is located on the light-out side of the display module 10 and between the display module 10 and the optical waveguide 60 in a light propagation path. The polarization module 20 is used to convert the display light G0 emitted by the display module 10 into first polarized light G1. The polarization beam splitter 30 is located between the polarization module 20 and the optical waveguide 60 in the light propagation path. The polarization beam splitter 30 is used to convert the first polarized light G1 into first sub-display light G21 and second sub-display light G22. After the first polarized light G1 passes through the polarization beam splitter 30, one of the first sub-display light G21 and the second sub-display light G22 is P light, and the other is S light. The first sub-light path 101 is located between the polarization beam splitter 30 and the first light-in area 60r1 in the light propagation path. The optical waveguide system 100 comprises a first phase retarder 41, a first mirror 51 and the first Bragg grating 60g1 arranged in sequence in the light propagation path and located on the first sub-light path 101. After the first sub-display light G21 passes through the first sub-light path 101, it enters the interior of the optical waveguide 60 at the first light-in area 60r1. The second sub-light path 102 is located between the polarization beam splitter 30 and the second light-in area 60r2 in the light propagation path. The optical waveguide system 100 comprises a second phase retarder 42, a second mirror 52 and the second Bragg grating 60g2 arranged in sequence in the light propagation path and located on the second sub-light path 102. After the second sub-display light G22 passes through the second sub-light path 102, it enters the interior of the optical waveguide 60 at the second light-in area 60r2.

[0061] For example, as Figure 1 , Figure 2 and Figure 3As shown in FIG. 1, a top view of the light waveguide 60 is schematically shown. The display module 10, the light waveguide 60, the polarization module 20, the polarization beamsplitter 30, the first sub-light path 101, the second sub-light path 102, and the like are only schematic diagrams of the light propagation order.

[0062] As shown in FIG. 1, the display module 10 emits display light G0, the display light G0 passes through the polarization module 20, the display light G0 is converted into first polarized light G1, the first polarized light G1 passes through the polarization beamsplitter 30, and is converted into first sub-display light G21 and second sub-display light G22. Figure 1 、 Figure 2 and Figure 3 As shown in FIG. 1, the polarization module 20 is located on the light-emitting side of the display module 10 and between the display module 10 and the light waveguide 60 in the light propagation path, i.e., the polarization module 20 is located on the side of the surface of the display module 10 from which the display light G0 is emitted.

[0063] As shown in FIG. 1, the display module 10 emits display light G0, the display light G0 passes through the polarization module 20, the display light G0 is converted into first polarized light G1, the first polarized light G1 passes through the polarization beamsplitter 30, and is converted into first sub-display light G21 and second sub-display light G22. Figure 2 、 Figure 3 As shown in FIG. 1, the display module 10 emits display light G0, the display light G0 passes through the polarization module 20, the display light G0 is converted into first polarized light G1, the first polarized light G1 passes through the polarization beamsplitter 30, and is converted into first sub-display light G21 and second sub-display light G22.

[0064] As shown in FIG. 1, the polarization direction of the first polarized light G1 is at an angle of 45 degrees with the transmission axis (p-axis) of the polarization beamsplitter 30, which can make the luminance of the converted first sub-display light G21 and second sub-display light G22 the same or substantially the same.

[0065] As shown in FIG. 1, the first Bragg grating 60g1 is made on the surface of the first light-in area 60r1, and the second Bragg grating 60g2 is made on the surface of the second light-in area 60r2.

[0066] As shown in FIG. 1, the display module 10 emits display light G0, the display light G0 passes through the polarization module 20, the display light G0 is converted into first polarized light G1, the first polarized light G1 passes through the polarization beamsplitter 30, and is converted into first sub-display light G21 and second sub-display light G22. Figure 1 、 Figure 2As shown, the first sub-display light G21 is transmitted in the first light expansion region 61 of the light waveguide 60, the second sub-display light G22 is transmitted in the second light expansion region 62 of the light waveguide 60, and the first sub-display light G21 and the second sub-display light G22 are emitted from the light exit region 60c1.

[0067] In the embodiments of the present application, as shown in Figures 1 to 3 As shown, the light waveguide 60 further includes a light exit region 60c1, the first sub-display light G21 and the second sub-display light G22 are emitted from the light exit region 60c1 after being transmitted in the light waveguide 60 respectively, the first sub-display light G21 has a first sub-picture H1, the second sub-display light G22 has a second sub-picture H2, and the first sub-display light G21 and the second sub-display light G22 are combined to form a final picture H12 after being emitted from the light exit region 60c1 after being transmitted in the light waveguide 60 respectively. Since the first light entrance region 60r1 is located at the first end 60a and the second light entrance region 60r2 is located at the second end 60b, the first end 60a and the second end 60b are two end parts of the light waveguide 60 arranged oppositely, even if there is an uneven defect in the first sub-display light G21 / first sub-picture H1 and / or the second sub-display light G22 / second sub-picture H2 after being transmitted in the light waveguide 60, but the uneven defects of the first sub-display light G21 / first sub-picture H1 and the second sub-display light G22 / second sub-picture H2 are mutually symmetrical, the image gradient is opposite, and they are mutually complementary, so that a final picture H12 with uniform picture and no defect can be formed, thereby solving or improving the problem of uneven picture caused by process error of the light waveguide.

[0068] In some embodiments, the polarization module 20 includes a polarizer (polarizing sheet), and the polarization beam splitter 30 includes a polarization beam splitter (PBS). In some embodiments, the first phase retarder 41 includes a first electrically controllable variable phase retarder (such as a liquid crystal variable phase retarder, for example, LCVR), and the second phase retarder 42 includes a second electrically controllable variable phase retarder (such as a liquid crystal variable phase retarder, for example, LCVR). In some embodiments, the first Bragg grating 60g1 is a first Bragg polarization selection grating, and the second Bragg grating 60g2 is a second Bragg polarization selection grating. In some embodiments, the first sub-display light G21 enters the inside of the light waveguide 60 at the first light entrance region 60r1 after sequentially passing through / through the first electrically controllable variable phase retarder, the first mirror 51, and the first Bragg polarization selection grating in the first sub-light path 101. In some embodiments, the second sub-display light G22 enters the inside of the light waveguide 60 at the second light entrance region 60r2 after sequentially passing through / through the second electrically controllable variable phase retarder, the second mirror 52, and the second Bragg polarization selection grating in the second sub-light path 102.

[0069] For example, the first phase retarder 41 comprises a first electrically controllable variable phase retarder (e.g., a liquid crystal variable phase retarder, such as an LCVR), and the second phase retarder 42 comprises a second electrically controllable variable phase retarder (e.g., a liquid crystal variable phase retarder, such as an LCVR). By adjusting the first and second electrically controllable variable phase retarders, the intensity / brightness of the first sub-display light G21 and the second sub-display light G22 entering the interior of the optical waveguide 60 can be adjusted.

[0070] In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604. Figures 1 to 3 In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604.

[0071] Figures 1 to 3 In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604.

[0072] In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604. Figures 1 to 3 In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604.

[0073] In some embodiments, as shown in FIG. 1A, the optical waveguide 60 comprises a first surface 601 and a second surface 602 arranged oppositely, and a third surface 603 and a fourth surface 604 arranged oppositely, the third surface 603 connecting the first surface 601 and the second surface 602 at a first end 60a, and the fourth surface 604 connecting the first surface 601 and the second surface 602 at a second end 60b. The first light-in area 60r1 is located on the first surface 601, and the second light-in area 60r2 is located on the second surface 602 or the fourth surface 604.

[0074] ​In some embodiments, the image gradient of the first sub-display light G21 after passing through the first Bragg grating 60g1 is opposite to the image gradient of the second sub-display light G22 after passing through the second Bragg grating 60g2; and / or, the transmission directions of the first sub-display light G21 and the second sub-display light G22 in the optical waveguide 60 are opposite. Figure 4 As shown in the figure, the first sub-display light G21 / first sub-picture H1 and / or the second sub-display light G22 / second sub-picture H2 have uneven defects after being transmitted in the optical waveguide 60, so that the uneven defects of the first sub-display light G21 / first sub-picture H1 and the second sub-display light G22 / second sub-picture H2 are mutually symmetrical, the image gradients are opposite, and they are mutually complementary, so that the final picture H12 with uniform picture and no defects can be better formed, thereby solving or improving the problem of uneven picture caused by process error of the optical waveguide.

[0075] For example, as shown in the figure, Figure 2 and Figure 4 As shown in the figure, the embodiments of the present application synthesize the final picture H12 by the method of coexistence of addition and subtraction, so that the sacrificed light intensity is relatively greatly reduced in a single light entry area, the image of the first sub-display light G21 / first sub-picture H1 is a gradual layer image from the upper right to the lower left, and the image of the second sub-display light G22 / second sub-picture H2 is a gradual layer image from the lower left to the upper right. Since the two images are light sources emitted by the same Digital Light Processing (DLP), they can be superimposed as the same image.

[0076] In some embodiments, the brightness of the first sub-display light G21 entering the inside of the optical waveguide 60 after passing through the first Bragg grating 60g1 is the first brightness, the brightness of the second sub-display light G22 entering the inside of the optical waveguide 60 after passing through the second Bragg grating 60g2 is the second brightness, and the first brightness is equal to the second brightness.

[0077] For example, as shown in the figure, Figure 4 The first brightness is equal to the second brightness, so that when the uneven defects of the first sub-display light G21 / first sub-picture H1 and the second sub-display light G22 / second sub-picture H2 are mutually symmetrical, the image gradients are opposite, and they are mutually complementary, a final picture H12 with more uniform color and uniform brightness (the brightness conforms to the image parameters) can be formed, thereby solving or improving the problem of uneven picture caused by process error of the optical waveguide.

[0078] In some embodiments, the first sub-display light G21 has a first brightness after entering the light waveguide 60 after passing through the first Bragg grating 60g1, and the second sub-display light G22 has a second brightness after entering the light waveguide 60 after passing through the second Bragg grating 60g2; the initial angle of the polarization module 20 is P, and the angle that the polarization module 20 needs to adjust is θ; before the polarization module 20 adjusts the angle, the first brightness is Y, and the second brightness is X; the angle of the polarization module 20 can be adjusted according to the following formula, so that after the polarization module 20 adjusts the angle, the first brightness is equal to the second brightness;

[0079] , .

[0080] For example, in specific implementation, the angle of the transmission axis or the angle of the absorption axis of the polarization module 20 / polarizer needs to be adjusted to make the first brightness and the second brightness meet the requirements.

[0081] For example, 1) before adjusting the angle of the polarization module 20 / polarizer, the brightness of the first sub-display light G21 after entering the light waveguide 60 after passing through the first Bragg grating 60g1 (the first brightness) and the brightness of the second sub-display light G22 after entering the light waveguide 60 after passing through the second Bragg grating 60g2 (the second brightness) are measured / obtained. 2) Then, according to the above formula, the angle that the polarization module 20 needs to adjust is θ. 3) Then, according to θ, the angle of the polarization module 20 is adjusted, so that after the polarization module 20 adjusts the angle, the first brightness is equal to the second brightness.

[0082] In some embodiments, as shown in Figure 3 , the first phase retarder 41 includes a first electrically controllable variable phase retarder, and the second phase retarder 42 includes a second electrically controllable variable phase retarder; the first electrically controllable variable phase retarder has a first phase retardation state, and the first sub-display light G21 is S light after passing through the first electrically controllable variable phase retarder and entering the light waveguide 60 after passing through the first Bragg grating 60g1; the second electrically controllable variable phase retarder has a second phase retardation state, and the second sub-display light G22 is S light after passing through the second electrically controllable variable phase retarder and entering the light waveguide 60 after passing through the second Bragg grating 60g2.

[0083] For example, as shown in Figure 3As shown, in some embodiments, by adjusting the first phase retarder 41 and the second phase retarder 42, the first sub-display light G21 and the second sub-display light G22 can both be converted into S light to enter the interior of the optical waveguide 60. The S light then synthesizes the final image H12, and in an augmented reality head-up display (ARHUD), only S light can be used for the image, so that the optical waveguide system 100 can be applied to the augmented reality head-up display (ARHUD).

[0084] For example, as Figure 2 shown, in some other embodiments, the first sub-display light G21 and the second sub-display light G22 are P light and S light respectively, and the P light and the S light synthesize the final image H12, which can be applied to products that do not have special requirements for S light.

[0085] In a second aspect, the present application also provides a display device, which comprises the optical waveguide system 100 of any one of the above.

[0086] For example, the display device can be an augmented reality head-up display (ARHUD), but is not limited thereto.

[0087] In some embodiments, as Figure 6 shown, the display module 10 comprises a digital micro-mirror device (DMD) and a plurality of light-emitting diodes, the digital micro-mirror device controls the plurality of light-emitting diodes to have a first light-emitting stage T1 and a first off stage T2, which alternately change. The first phase retarder 41 is a first electrically controllable variable phase retarder, and the second phase retarder 42 is a second electrically controllable variable phase retarder. The first Bragg grating 60g1 is a first Bragg polarization selection grating, and the second Bragg grating 60g2 is a second Bragg polarization selection grating. In the first light-emitting stage T1, the first electrically controllable variable phase retarder has a third phase retardation state, and the first sub-display light G21 enters the interior of the optical waveguide 60 after passing through the first Bragg polarization selection grating; in the first light-emitting stage, the second electrically controllable variable phase retarder has a fourth phase retardation state, and the second sub-display light G22 enters the interior of the optical waveguide 60 after passing through the second Bragg polarization selection grating. In the first off stage T2, the first electrically controllable variable phase retarder has a fifth phase retardation state, and the first sub-display light G21 is blocked by the first Bragg polarization selection grating; the second electrically controllable variable phase retarder has a sixth phase retardation state, and the second sub-display light G22 is blocked by the second Bragg polarization selection grating.

[0088] For example, when the display module 10 displays an image, only one color of LED in one pixel is lit at the same time (in a first light-emitting stage T1), the red light-emitting diode RLED in the same pixel is turned on while the green light-emitting diode GLED and the blue light-emitting diode BLED are turned off, the green light-emitting diode GLED is turned on while the red light-emitting diode RLED and the blue light-emitting diode BLED are turned off, and the blue light-emitting diode BLED is turned on while the red light-emitting diode RLED and the green light-emitting diode GLED are turned off, so as to generate white light.

[0089] For example, the display module 10 adopts a digital light processing (DLP) technology including a digital micro-mirror device (DMD), and in the light-emitting mode of the DMD of the display module 10, the DLP generates weak light when projecting a black picture, which is caused by the fact that the LED of the DLP is always turned on, the micro-lens of the DMD controls the light emission, and the reflected light generated when the LED hits the rear structure of the DMD micro-mirror directly affects the stray light after the imaging of the optical waveguide 60, resulting in a serious decrease in overall contrast. Therefore, in the first light-emitting stage T1, as shown in FIG. 1B, by adjusting the first phase retarder 41 and the second phase retarder 42, the first sub-display light G21 and the second sub-display light G22 can both enter the inside of the optical waveguide 60, and then the final image H12 is synthesized. Figure 2 or Figure 3 As shown in FIG. 1C, in the first light-emitting stage T1, by adjusting the first phase retarder 41 and the second phase retarder 42, the first sub-display light G21 and the second sub-display light G22 can both enter the inside of the optical waveguide 60, and then the final image H12 is synthesized. Figure 5 As shown in FIG. 1D, in the first light-emitting stage T1, by adjusting the first phase retarder 41 and the second phase retarder 42, the first sub-display light G21 and the second sub-display light G22 are both stray light, the first sub-display light G21 is blocked by the first Bragg polarization selection grating, and the second sub-display light G22 is blocked by the second Bragg polarization selection grating, so that the stray light can be avoided from entering the optical waveguide 60 to affect the imaging quality, thereby avoiding the decrease in contrast.

[0090] For example, the LCVR has the function of selecting the wavelength transmittance, and the light emission of the DMD is to divide the light-emitting diode (RGB) into three cycles to emit light, so that the wavelength of the LCVR can be dynamically adjusted to match the time of the light-emitting diode (RGB) switching, that is, the Bragg polarization selection grating can be used to select the polarized light output, so that the stray light generated when the DMD black pixel (the first light-emitting stage T2) is reduced.

[0091] In a third aspect, the present application also provides an electronic device, which comprises the optical waveguide system 100 or the display device in any of the above.

[0092] For example, the display device can be an AR head-mounted display, AR glasses, a vehicle-mounted HUD (head-up display), etc., but is not limited thereto.

[0093] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features described in the above embodiments are described, however, as long as the combination of the technical features does not result in a contradiction, it should be considered to be within the scope of the present disclosure.

[0094] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical waveguide system, characterized in that, include: Display module; An optical waveguide includes a first end and a second end disposed opposite to each other. A first light-incident region is located on one side surface of the first end, and a second light-incident region is located on one side surface of the second end. The first light-incident region has a first Bragg grating, and the second light-incident region has a second Bragg grating. A polarization module is located on the light-emitting side of the display module and between the display module and the optical waveguide in the light propagation path. The polarization module is used to convert the display light emitted by the display module into first polarized light. A polarization beam splitter is located between the polarization module and the optical waveguide in the light propagation path. The polarization beam splitter is used to convert the first polarized light into a first sub-display light and a second sub-display light. After the first polarized light passes through the polarization beam splitter, one of the first sub-display light and the second sub-display light is P-light and the other is S-light. The first sub-optical path is located between the polarization beam splitter and the first incident light region on the optical propagation path. The optical waveguide system includes a first phase delayer, a first reflector, and a first Bragg grating located on the first sub-optical path and sequentially arranged on the optical propagation path. The first sub-display light enters the interior of the optical waveguide in the first incident light region after passing through the first sub-optical path. The second sub-optical path is located between the polarization beam splitter and the second incident light region on the optical propagation path. The optical waveguide system includes a second phase delayer, a second reflector, and a second Bragg grating located on the second sub-optical path and arranged sequentially on the optical propagation path. The second sub-display light enters the interior of the optical waveguide in the second incident light region after passing through the second sub-optical path.

2. The optical waveguide system according to claim 1, characterized in that, The polarization module includes a polarizer; The polarization beam splitter includes a polarizing beam splitter; The first phase delay unit includes a first electrically controlled variable phase delay unit, and the second phase delay unit includes a second electrically controlled variable phase delay unit; The first Bragg grating is a first Bragg polarization-selective grating, and the second Bragg grating is a second Bragg polarization-selective grating; After passing sequentially through the first electrically controlled variable phase delayer, the first reflector and the first Bragg polarization selection grating in the first sub-light path, the first sub-display light enters the interior of the optical waveguide in the first incident light region; The second sub-display light passes sequentially through the second electrically controlled variable phase delayer, the second reflector, and the second Bragg polarization selection grating in the second sub-light path before entering the interior of the optical waveguide in the second incident light region.

3. The optical waveguide system according to claim 1, characterized in that, The optical waveguide includes a first surface and a second surface arranged in opposite directions, as well as a third surface and a fourth surface arranged in opposite directions. The third surface connects the first surface and the second surface at the first end, and the fourth surface connects the first surface and the second surface at the second end. The first light-incident area is located on the first surface, and the second light-incident area is located on the second surface or the fourth surface.

4. The optical waveguide system according to claim 1, characterized in that, The image gradient of the first sub-display light after passing through the first Bragg grating is opposite to the image gradient of the second sub-display light after passing through the second Bragg grating; and / or, The first sub-display light and the second sub-display light propagate in opposite directions in the optical waveguide.

5. The optical waveguide system according to claim 1, characterized in that, The brightness of the first sub-display light entering the optical waveguide after passing through the first Bragg grating is the first brightness, and the brightness of the second sub-display light entering the optical waveguide after passing through the second Bragg grating is the second brightness. The first brightness and the second brightness are equal.

6. The optical waveguide system according to claim 1, characterized in that, The brightness of the first sub-display light entering the optical waveguide after passing through the first Bragg grating is the first brightness, and the brightness of the second sub-display light entering the optical waveguide after passing through the second Bragg grating is the second brightness. The initial angle of the polarization module is P, and the angle that the polarization module needs to be adjusted to is θ. Before the polarization module adjusts its angle, the first brightness is Y, and the second brightness is X; The angle of the polarization module can be adjusted according to the following formula so that the first brightness and the second brightness are equal after the polarization module is adjusted. ， 。 7. The optical waveguide system according to claim 1, characterized in that, The first phase delay unit includes a first electrically controlled variable phase delay unit, and the second phase delay unit includes a second electrically controlled variable phase delay unit; The first electrically controlled variable phase delayer has a first phase delay state. The first sub-display light becomes S-light after passing through the first electrically controlled variable phase delayer. The first sub-display light enters the optical waveguide after passing through the first Bragg grating. The second electrically controlled variable phase delayer has a second phase delay state. The second sub-display light becomes an S-beam after passing through the second electrically controlled variable phase delayer. The second sub-display light enters the optical waveguide after passing through the second Bragg grating.

8. A display device, characterized in that, Includes the optical waveguide system as described in any one of claims 1 to 7.

9. The display device according to claim 8, characterized in that, The display module includes a digital micromirror device and a plurality of light-emitting diodes. The digital micromirror device controls the plurality of light-emitting diodes to have a first emitting phase and a first off phase, and the first emitting phase and the first off phase alternately. The first phase delay is a first electrically controlled variable phase delay, and the second phase delay is a second electrically controlled variable phase delay; The first Bragg grating is a first Bragg polarization-selective grating, and the second Bragg grating is a second Bragg polarization-selective grating; In the first light emission stage, the first electrically controlled variable phase delayer has a third phase delay state, and the first sub-display light enters the optical waveguide after passing through the first Bragg polarization selection grating; in the first light emission stage, the second electrically controlled variable phase delayer has a fourth phase delay state, and the second sub-display light enters the optical waveguide after passing through the second Bragg polarization selection grating. During the first shutdown phase, the first electrically controlled variable phase delayer has a fifth phase delay state, and the first sub-display light is blocked by the first Bragg polarization selection grating; the second electrically controlled variable phase delayer has a sixth phase delay state, and the second sub-display light is blocked by the second Bragg polarization selection grating.

10. An electronic device, characterized in that, Includes the display device as described in claim 8 or 9.

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