A method for setting the function of a polarization selection layer, a diffraction optical waveguide, a display device, an electronic device and a storage medium

Abstract

The present application discloses a method for setting the function of a polarization selection layer, a diffraction optical waveguide, a display device, an electronic device and a storage medium, and relates to the technical field of display devices. The method for setting the function of a polarization selection layer is applied to a diffraction optical waveguide, and the diffraction optical waveguide includes a polarization selection layer. The method includes: generating a polarization state image of light when the light source is coupled out on the world side surface of the diffraction optical waveguide according to the polarization state of the light source and the polarization response of the diffraction optical waveguide; determining an orthogonal polarization state image according to the polarization state image of the light; fitting the orthogonal polarization state image and a preset array density to obtain a polarization selection layer array; and setting the function of the polarization selection layer according to the polarization selection layer array, so that the polarization selection layer can greatly suppress or eliminate the coupled light on the world side surface. The present application can suppress the light leakage problem of the diffraction optical waveguide.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a method for setting the function of a polarization selection layer, a diffraction optical waveguide, a display device, an electronic device and a storage medium. Background Art

[0002] With the rapid development of AR (Augmented Reality) technology and MR (Mixed Reality) technology, display devices such as AR / MR devices have gradually been integrated into people's daily lives and become an important part of modern technological experience.

[0003] In AR / MR display devices, the use of diffraction waveguides to achieve efficient transmission and display of images has become a mainstream solution. However, since the diffraction grating built into the diffraction waveguide has both transmission and reflection working modes, unnecessary light leakage occurs, that is, some light unexpectedly escapes from the waveguide and leaks to outsiders, which not only affects the appearance, but also causes the wearer's privacy to be leaked, affecting the wearer's wearing experience.

[0004] In summary, how to suppress the light leakage problem of diffraction optical waveguide has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The main purpose of the present application is to provide a method for setting the function of a polarization selection layer, a diffraction optical waveguide, a display device, an electronic device and a storage medium, aiming to suppress the light leakage problem of the diffraction optical waveguide.

[0006] To achieve the above object, the present application proposes a method for setting the function of a polarization selection layer, the method for setting the function of a polarization selection layer is applied to a diffractive optical waveguide, the diffractive optical waveguide includes a polarization selection layer, and the method for setting the function of the polarization selection layer includes:

[0007] Generate a polarization state image of light when the light source is coupled out on the world-side surface of the diffractive optical waveguide according to the polarization state of the light source and the polarization response of the diffractive optical waveguide;

[0008] Determine an orthogonal polarization state image according to the light polarization state image;

[0009] Fitting is performed according to the orthogonal polarization state images and a preset array density to obtain a polarization selective layer array;

[0010] The function of the polarization selective layer is set according to the polarization selective layer array so that the polarization selective layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0011] In one embodiment, the polarization selective layer is a first polarization selective layer, and the step of setting the function of the polarization selective layer according to the polarization selective layer array so that the polarization selective layer significantly suppresses or eliminates the outcoupled light from the world-side surface comprises:

[0012] The spatial coordinate position and target orientation of each first polarization element in the first polarization selection layer are determined according to the polarization selection layer array, so that the first polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0013] In one embodiment, the polarization selective layer is a second polarization selective layer, and the step of setting the function of the polarization selective layer according to the polarization selective layer array so that the polarization selective layer significantly suppresses or eliminates the outcoupled light from the world-side surface comprises:

[0014] The spatial coordinate position and target orientation of each second polarization element in the second polarization selection layer are determined according to the polarization selection layer array, so that the second polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface when powered on.

[0015] In one embodiment, the polarization selective layer is a third polarization selective layer, and the step of setting the function of the polarization selective layer according to the polarization selective layer array so that the polarization selective layer significantly suppresses or eliminates the outcoupled light from the world-side surface comprises:

[0016] Determining the spatial coordinate position and target orientation of each first polarization device or second polarization device in the outer layer of the third polarization selection layer according to the polarization selection layer array;

[0017] According to the spatial coordinate position and target orientation of each first polarizer or second polarizer in the outer layer, the fast axis angle and delay amount of each delay device in the inner layer of the third polarization selection layer are determined, so that the third polarization selection layer can significantly suppress or eliminate the outcoupled light from the world side surface.

[0018] In addition, to achieve the above-mentioned purpose, the present application also proposes a diffractive optical waveguide, wherein the diffractive optical waveguide adopts the polarization selection layer function setting method as described above, and the diffractive optical waveguide comprises: a waveguide substrate, an in-coupling grating, an out-coupling grating and a polarization selection layer;

[0019] The coupling-in grating and the coupling-out grating are respectively arranged on the surface or inside of the waveguide substrate, and the surface of the waveguide substrate includes an eye-side surface and a world-side surface;

[0020] The polarization selection layer is disposed inside the waveguide substrate or on the world-side surface.

[0021] In one embodiment, the polarization selection layer is a first polarization selection layer, and any spatial coordinate position in the first polarization selection layer is a first polarization device with a specific orientation.

[0022] In one embodiment, the polarization selective layer is a second polarization selective layer, and any spatial coordinate position in the second polarization selective layer is a second polarization device with a specific orientation when powered on and no polarization selectivity when powered off.

[0023] In one embodiment, the polarization selective layer is a third polarization selective layer, and the third polarization selective layer includes an outer layer and an inner layer, wherein the outer layer is a layer away from the eye-entering side surface, and the inner layer is a layer close to the eye-entering side surface, and any spatial coordinate position in the outer layer is a first polarizer with a specific orientation, or any spatial coordinate position in the outer layer is a second polarizer with a specific orientation when powered on and no polarization selectivity when powered off;

[0024] Any spatial coordinate position in the inner layer is a retarder with a specific fast axis angle and a specific delay amount.

[0025] In one embodiment, the outer array and the inner array of the third polarization selective layer are aligned and stacked.

[0026] In one embodiment, the polarization selection layer is any one of a dichroic polarizing film array layer, a crystal polarizing film array layer, a wire grid polarizing film array layer, a plastic polarizing film array layer or a liquid crystal array layer.

[0027] In one embodiment, the diffraction optical waveguide further comprises a turning grating, and the turning grating is arranged between the coupling-in grating and the coupling-out grating.

[0028] In addition, to achieve the above-mentioned purpose, the present application also proposes a polarization selection layer function setting device, which is applied to the diffraction light waveguide as described above, wherein the diffraction light waveguide includes a polarization selection layer, and the polarization selection layer function setting device includes:

[0029] A polarization state image determination module, used to generate a polarization state image of light when the light source is coupled out on the world side surface of the diffractive optical waveguide according to the polarization state of the light source and the polarization response of the diffractive optical waveguide;

[0030] An orthogonal polarization state image determination module, used to determine an orthogonal polarization state image according to the light polarization state image;

[0031] An array fitting module, used for fitting according to the orthogonal polarization state image and a preset array density to obtain a polarization selection layer array;

[0032] A function setting module is used to set the function of the polarization selection layer according to the polarization selection layer array, so that the polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0033] In addition, to achieve the above-mentioned purpose, the present application also proposes a display device, the display device includes the above-mentioned diffraction optical waveguide, and the display device is an augmented reality display device or a mixed reality display device.

[0034] In addition, to achieve the above objectives, the present application also proposes an electronic device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the polarization selection layer function setting method as described above.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the polarization selection layer function setting method as described above are implemented.

[0036] The present application proposes a method for setting the function of a polarization selection layer, which is applied to a diffraction optical waveguide, wherein the diffraction optical waveguide includes a polarization selection layer. According to the polarization state of the light source and the polarization response characteristics of the diffractive optical waveguide itself, a polarization state image of the light when the light source is coupled out on the world side surface of the diffractive optical waveguide is generated, and the polarization state image of the light shows the polarization state distribution of the light emitted by the light source when it is coupled out on the world side surface of the waveguide after passing through the waveguide; then, based on the determined light polarization state image, an orthogonal polarization state image orthogonal to it is identified and determined; then, using the determined orthogonal polarization state image, combined with a preset array density (i.e., the distribution density of polarization devices in the polarization selection layer), a fitting optimization design is performed to generate a polarization selection layer array that can effectively filter out orthogonal polarized light, so that the polarization selection layer can not only efficiently block unnecessary light (i.e., light leakage) but also does not affect the transmission of normal light; finally, according to the polarization selection layer array, the specific functional parameters of the polarization selection layer in the diffractive optical waveguide are set, and these parameters ensure that the polarization selection layer can accurately act on the orthogonal polarization state light, thereby effectively eliminating or significantly suppressing these lights when coupling out from the world side surface of the waveguide, thereby solving the light leakage problem.

[0037] The present application also proposes a diffraction optical waveguide, which includes: a waveguide substrate, a coupling-in grating, a coupling-out grating and a polarization selection layer. The waveguide substrate serves as a medium for transmitting optical signals, and its surface is divided into an eye-side surface (facing the user's eyes) and a world-side surface (facing the external environment), which provides a stable physical support and optical path for the diffraction optical waveguide. The coupling-in grating and the coupling-out grating are arranged on the surface or inside of the waveguide substrate. The coupling-in grating is responsible for coupling the light emitted by the light source into the inside of the waveguide substrate for optical signal transmission. The coupling-out grating is used to couple the optical signal transmitted inside the waveguide substrate out to the direction of the user's human eyes. A polarization selection layer is arranged inside or on the world-side surface of the waveguide substrate. The polarization selection layer can selectively allow light waves of a specific polarization direction to pass through, while effectively blocking or weakening light waves of other polarization directions, thereby significantly reducing the leakage of optical signals on the world-side surface of the waveguide substrate, that is, suppressing the light leakage phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of a flow chart provided for Embodiment 1 of the method for setting the function of a polarization selection layer of the present application;

[0041] Figure 2 A schematic diagram of a light polarization state image provided in Example 1 of the method for setting the function of a polarization selection layer of the present application;

[0042] Figure 3 A schematic diagram of an orthogonal polarization state image provided in Example 1 of the method for setting the function of a polarization selection layer of the present application;

[0043] Figure 4 A schematic diagram of the distribution image of the polarization analysis axis provided in Example 1 of the method for setting the function of the polarization selection layer of the present application;

[0044] Figure 5 Schematic diagram of a diffraction optical waveguide structure in the related art;

[0045] Figure 6 A schematic structural diagram of a diffractive optical waveguide provided in the second embodiment of the diffractive optical waveguide of the present application;

[0046] Figure 7This is a schematic diagram of the module structure of the polarization selection layer function setting device according to an embodiment of the present application;

[0047] Figure 8 Schematic diagram of the device structure of the hardware operating environment involved in the method for setting the function of the polarization selection layer in the embodiment of the present application.

[0048] Figure 5 Description of Figure Numbers:

[0049]

[0050] Figure 6 Description of Figure Numbers:

[0051]

[0052] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0054] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0055] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a computer, a server, etc., or an electronic device capable of realizing the above functions, etc. The following takes the polarization selection layer function setting terminal as an example to illustrate this embodiment and the following embodiments.

[0056] The light leakage of traditional diffraction waveguides is not only unsightly, but also easily causes privacy leakage. Unfortunately, diffraction waveguides always have light leakage. This is because the diffraction grating in the waveguide always has two working modes, transmission and reflection, which emits light on both the eye side and the world side. Although some designs can be used to suppress a certain working mode, so that the light efficiency on the world side is reduced, the natural characteristics of the grating make such light leakage suppression effect limited. Shielding is also a solution, but it will lead to the loss of the perspective function of the diffraction waveguide, and it can only give up the acquisition of the external environment field of view, or use the camera display method to shoot the environment in real time and project it, that is, camera perspective.

[0057] Fortunately, due to the strong polarization response characteristics of the diffraction grating, combined with the optical machine of a specific polarization state, the output light of the diffraction waveguide system can have a relatively stable polarization state image; while the ambient light is usually unpolarized - this difference makes it possible to significantly suppress or even completely eliminate leakage light through polarization selection while retaining the perspective function.

[0058] In this embodiment, the method for setting the function of a polarization selective layer is applied to a diffractive optical waveguide, which includes a polarization selective layer.

[0059] In this embodiment, Figure 1 As shown, the polarization selection layer function setting method includes steps S10 to S40:

[0060] Step S10, generating a polarization state image of light when the light source is coupled out from the world-side surface of the diffractive optical waveguide according to the polarization state of the light source and the polarization response of the diffractive optical waveguide;

[0061] It should be noted that the polarization state of a light source refers to the vibration direction of the electric field of the light emitted by the light source at a fixed point in space. In a diffraction waveguide display system, in order to optimize the transmission and display effects of light, a light source with a specific polarization state is usually used. The light source can be polarized light, such as linearly polarized light, circularly polarized light, elliptically polarized light, etc.

[0062] It should also be noted that the polarization response of a diffractive waveguide refers to the transmission characteristics of the diffractive waveguide for light of different polarization states, including transmittance, reflectivity, phase delay, etc. These characteristics vary depending on factors such as the material, structure, and manufacturing process of the waveguide.

[0063] According to the polarization state of the light source and the polarization response characteristics of the diffraction optical waveguide itself, a polarization state image of the light from the light source when it is coupled out on the world-side surface of the diffraction optical waveguide is generated through simulation or experimental means. The polarization state image shows the polarization state distribution of the light emitted by the light source when it is coupled out on the world-side surface of the waveguide after passing through the waveguide.

[0064] Exemplarily, based on the polarization state of the light source and the polarization response of the diffractive optical waveguide, a polarization state image of the light when the light source is coupled out from the world side surface of the diffractive optical waveguide is generated, such as Figure 2 As shown, the number of light polarization state elements in the image is determined by the number of selected light source points, and 10×10 points are used here. For example, a light polarization state is randomly set for each position, such as linear polarized light, circular polarized light, elliptically polarized light, etc.

[0065] Step S20, determining an orthogonal polarization state image according to the light polarization state image;

[0066] Based on the determined light polarization state image, an orthogonal polarization state image orthogonal thereto is identified and determined. The orthogonal polarization state image corresponds to the light polarization state image and represents the distribution of polarization states orthogonal to the polarization state of the light output from the world side surface of the waveguide.

[0067] In a diffraction optical waveguide display system, light in orthogonal polarization states is often the main cause of light leakage problems. By determining the orthogonal polarization state image, the portion of light that needs to be filtered out by the polarization selection layer can be determined, thereby optimizing the display effect.

[0068] In addition, since the same position may have light rays at different angles, if light rays at different angles have the same polarization state, their orthogonal polarization state is taken; if light rays at different angles have different polarization states, multiple angles are selected as needed and these angles are accumulated according to the diffraction efficiency relationship to obtain a comprehensive polarization state, or one angle is selected as a representative polarization state as needed, and the comprehensive polarization state or the orthogonal polarization state of the representative polarization state is taken.

[0069] For example, according to Figure 2 The orthogonal polarization state image determined by the light polarization state image is as follows Figure 3 shown.

[0070] Step S30, performing fitting according to the orthogonal polarization state images and a preset array density to obtain a polarization selective layer array;

[0071] It should be noted that the polarization selective layer array is an array structure composed of one or more polarization devices (such as polarization films, polarizers, etc.) with specific polarization selection functions. The polarization devices are precisely arranged at specific spatial coordinate positions of the polarization selective layer to achieve selective transmission or reflection of light in a specific polarization state.

[0072] By using the determined orthogonal polarization state images and combining them with the preset array density (i.e., the distribution density of polarization devices in the polarization selective layer), a fitting optimization design is performed to generate a polarization selective layer array that can effectively filter out orthogonal polarized light, so that the polarization selective layer can not only efficiently block unnecessary light (i.e., light leakage) but also does not affect the transmission of normal light.

[0073] Step S40: setting the function of the polarization selective layer according to the polarization selective layer array, so that the polarization selective layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0074] The main function of the polarization selective layer in the diffraction light waveguide display system is to eliminate or suppress the outcoupling of orthogonal polarization light on the outer side surface of the waveguide, thereby reducing light leakage. In addition, the polarization selective layer can also have other auxiliary functions, such as adjusting light intensity, optimizing color distribution, etc.

[0075] According to the polarization selective layer array, the specific functional parameters of the polarization selective layer in the diffraction optical waveguide are set. These parameters ensure that the polarization selective layer can accurately act on the orthogonal polarization state light, thereby effectively eliminating or significantly suppressing these lights when coupling out from the outer side surface of the waveguide, thereby solving the light leakage problem.

[0076] In this way, by setting the function of the polarization selection layer in the diffraction optical waveguide, it is possible to block the leakage light generated by the light source to the world side during the transmission through the optical waveguide. At the same time, the function of the polarization selection layer can be adjusted and optimized according to the characteristics of different light sources and waveguides to meet the display requirements in different application scenarios.

[0077] In addition, in a feasible implementation, the external environment brightness is monitored in real time by a preset ambient light sensor to obtain ambient brightness data; the transmission characteristic change of the polarization selection layer is calculated according to the ambient brightness data and the preset transmittance; the orientation of the polarization device in the polarization selection layer is adjusted according to the transmission characteristic change, so that the polarization selection layer transmits the external ambient light according to the transmittance. Thus, in an outdoor strong light environment, the polarization selection layer can effectively suppress the interference of external stray light, and at the same time adjust the light intensity entering the glasses, protect the user's eyes and improve the display clarity.

[0078] In a feasible embodiment, the polarization selective layer is a first polarization selective layer, and step S40 may include step S401:

[0079] Step S401 : determining the spatial coordinate position and target orientation of each first polarization element in the first polarization selection layer according to the polarization selection layer array, so that the first polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0080] In this embodiment, the polarization selection layer is set to be a first polarization selection layer, which is composed of first polarization devices with fixed or adjustable orientations. The first polarization devices can accurately control the polarization state of light, thereby greatly suppressing or eliminating the outcoupled light from the world side surface of the waveguide.

[0081] In order to effectively suppress or eliminate the light coupled out of the optical waveguide to the world-side surface, the spatial coordinate position of each first polarizer in the first polarization selection layer is determined one by one according to the determined polarization selection layer array, and the target orientation (i.e., the direction of the polarization axis / analyzer axis) is specified for each first polarizer.

[0082] In another feasible embodiment, the polarization selective layer is a second polarization selective layer, and step S40 may include step S402:

[0083] Step S402, determining the spatial coordinate position and target orientation of each second polarization device in the second polarization selection layer according to the polarization selection layer array, so that the second polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface when powered on.

[0084] In this embodiment, the polarization selection layer is set to be a second polarization selection layer, which is composed of second polarization devices whose orientation is fixed or adjustable when powered on and have no polarization selectivity when powered off. The second polarization device can accurately control the polarization state of light when powered on, thereby greatly suppressing or eliminating the outcoupled light on the world side surface of the waveguide when powered on.

[0085] In order to effectively suppress or eliminate the light coupled out of the optical waveguide to the world-side surface, the spatial coordinate position of each second polarizer in the second polarization selective layer is determined one by one according to the determined polarization selective layer array, and a target orientation (i.e., the direction of the polarization axis / analyzer axis) is specified for each second polarizer.

[0086] In addition, in a feasible implementation, refined power on and off can also be performed, that is, real-time monitoring of whether each display area in the picture display area of ​​the display device has a display picture, wherein the display device is a device equipped with the diffractive optical waveguide; for each of the first display areas with a display picture, the second polarization device corresponding to the position of the first display area is controlled to be powered on; for each of the second display areas without a display picture, the second polarization device corresponding to the position of the second display area is controlled to be powered off. Thus, whether each second polarization device is powered on or not is determined by the display picture, and is powered on when a picture is displayed at a certain position, and is powered off when no picture is displayed or the entire device is turned off. In this case, the loss of the overall wearing experience will be reduced to a very slight level.

[0087] In another feasible embodiment, the polarization selective layer is a third polarization selective layer, and step S40 may include steps S403-S404:

[0088] Step S403, determining the spatial coordinate position and target orientation of each first polarization device or second polarization device in the outer layer of the third polarization selection layer according to the polarization selection layer array;

[0089] Step S404, determining the fast axis angle and delay amount of each delay device in the inner layer of the third polarization selection layer according to the spatial coordinate position and target orientation of each first polarization device or second polarization device in the outer layer, so that the third polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0090] In this embodiment, the polarization selective layer is set to be the third polarization selective layer, which includes an inner layer and an outer layer. The outer layer is a layer away from the user's eyes. The outer layer is the aforementioned first polarization selective layer or the second polarization selective layer. The inner layer is a layer close to the user's eyes. The inner layer is composed of various delay devices. The delay device is an optical element used to change the phase of the light wave, which can cause components of different polarization directions in the light wave to produce a phase difference when passing through, thereby realizing the regulation of the polarization state of the light wave.

[0091] In order to effectively suppress or eliminate the light coupled out from the optical waveguide to the world-side surface, the spatial coordinate position of each first polarizer or second polarizer in the outer layer is determined one by one according to the determined polarization selection layer array, and the target orientation (i.e. the direction of the polarization axis / analyzer axis) is specified for each first polarizer or second polarizer. Then, based on the configuration of the outer polarizer, the fast axis angle (i.e. the optical axis direction) and the delay amount (i.e. the amount of phase delay when light passes through) of each retarder in the inner layer are calculated and set. The optical axis direction of each retarder is consistent with the analyzer axis direction of the polarizer at the corresponding position, and the delay amount follows the rule of reducing the ellipticity of the polarization state of the light of each unit to 0, so that the retarder in the inner layer and the outer polarizer work together to further optimize the polarization state of the light and ensure that the third polarization selection layer can effectively suppress or eliminate the coupled light from the world-side surface.

[0092] For example, according to Figure 3 The distribution image of the polarization axis of the polarization device (the first polarization device or the second polarization device) in the polarization selection layer (the first polarization selection layer, the second polarization selection layer or the third polarization selection layer) determined by the orthogonal polarization state image is as follows: Figure 4 shown.

[0093] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the diffraction optical waveguide of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0094] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction and will not be repeated later. On this basis, the embodiment of the present application provides a diffractive optical waveguide, which adopts the polarization selection layer function setting method as described in the embodiment 1.

[0095] In the related art, the structure of the diffraction optical waveguide 100' is as follows Figure 5 As shown, the diffraction optical waveguide 100' comprises a waveguide substrate 01', an in-coupling grating 02' and an out-coupling grating 03', wherein the in-coupling grating 02' couples light into the waveguide substrate 01' and transmits the light in the waveguide substrate 01' until the light reaches the out-coupling grating 03' and is coupled out. Since the grating has two working modes, namely, reflection and transmission, the out-coupling grating 03' will emit display content to both sides of the waveguide, namely, coupling out the world-side leakage light and the eye-side display light. Meanwhile, the ambient light can also be transmitted to the human eye through the waveguide.

[0096] In AR / MR display devices, the use of diffraction waveguides to achieve efficient transmission and display of images has become a mainstream solution. However, the built-in diffraction grating in the diffraction waveguide has both transmission and reflection working modes, which leads to unnecessary light leakage. That is, some light unexpectedly escapes from the waveguide and leaks to outsiders, which not only affects the appearance, but also causes the wearer's privacy to be leaked, affecting the wearer's wearing experience.

[0097] The embodiment of the present application provides a solution by designing a Figure 6 The diffraction optical waveguide 100 shown in the figure comprises: a waveguide substrate 01, an in-coupling grating 02, an out-coupling grating 03 and a polarization selection layer 04. The waveguide substrate 01 is used as a medium for transmitting optical signals. Its surface is divided into an eye-side surface (facing the user's eyes) and a world-side surface (facing the external environment), which provides a stable physical support and optical path for the diffraction optical waveguide 100. The in-coupling grating 02 and the out-coupling grating 03 are arranged on the surface or inside of the waveguide substrate 01. The in-coupling grating 02 is responsible for coupling the light emitted by the light source into the inside of the waveguide substrate 01 for optical signal transmission. The out-coupling grating 03 is used to couple the optical signal transmitted inside the waveguide substrate 01 out to the direction of the user's human eyes. The polarization selection layer 04 is arranged inside or on the world-side surface of the waveguide substrate 01. The polarization selection layer 04 can selectively allow light waves of a specific polarization direction to pass through, and effectively block or weaken light waves of other polarization directions, thereby significantly reducing the leakage of optical signals on the world-side surface of the waveguide substrate 01, that is, suppressing the light leakage phenomenon.

[0098] In this embodiment, the diffraction optical waveguide 100 includes: a waveguide substrate 01, an in-coupling grating 02, an out-coupling grating 03 and a polarization selection layer 04;

[0099] The coupling-in grating 02 and the coupling-out grating 03 are respectively arranged on the surface or inside of the waveguide substrate 01, and the surface of the waveguide substrate 01 includes an eye-side surface and a world-side surface;

[0100] The polarization selective layer 04 is disposed on the inner or world-side surface of the waveguide substrate 01 .

[0101] In this embodiment, the diffraction optical waveguide 100 includes a waveguide substrate 01, an in-coupling grating 02, an out-coupling grating 03 and a polarization selection layer 04, wherein the waveguide substrate 01 is the basic structure constituting the diffraction optical waveguide 100, and is usually a transparent material layer for guiding the propagation of light waves inside, and its surface is divided into an eye-entry side surface (the side facing the user's eyes) and a world-side surface (the side facing the external environment); the in-coupling grating 02 is arranged on the surface or inside of the waveguide substrate 01, and is used to couple the light emitted by an external light source (such as an optical machine) into the waveguide substrate 01 to realize the propagation of optical signals; the out-coupling grating 03 is arranged on the surface or inside of the waveguide substrate 01, and is used to couple out the optical signal transmitted in the waveguide substrate 01 at a specific angle, and directly project it onto the user's retina to form a virtual image; the polarization selection layer 04 is arranged inside or on the world-side surface of the waveguide substrate 01, and is used to control the polarization state of light passing through the optical waveguide, and the polarization selection layer 04 covers all or part of the world-side range of the waveguide.

[0102] Furthermore, in actual application scenarios, no matter the outcoupling grating 03 and the polarization selection layer 04 are disposed inside or on the surface of the waveguide substrate 01 , the polarization selection layer 04 is always located farther away from the user's eyes than the outcoupling grating 03 .

[0103] In this embodiment, if Figure 6 As shown, Figure 6 A structural form of the diffraction optical waveguide 100 of this embodiment is shown, and the diffraction optical waveguide 100 includes a waveguide substrate 01, an in-coupling grating 02, an out-coupling grating 03 and a polarization selection layer 04, wherein the in-coupling grating 02 and the out-coupling grating 03 are respectively arranged on the world side surface of the waveguide substrate 01, and the out-coupling grating 03 can couple the display light on the eye side to the human eye, but at the same time, it will also generate world side leakage light to the external environment. The polarization selection layer 04 is arranged on the world side surface of the waveguide substrate 01, covering part of the world side of the waveguide, and the polarization selection layer 04 is farther away from the human eye position than the out-coupling grating 03, and the world side leakage light of the waveguide can be effectively suppressed by the polarization selection layer 04, and at the same time, the ambient light will not be blocked from entering the human eye.

[0104] In a feasible embodiment, the polarization selection layer 04 is a first polarization selection layer, and any spatial coordinate position in the first polarization selection layer is a first polarization device with a specific orientation.

[0105] In another feasible embodiment, the polarization selective layer 04 is a second polarization selective layer, and any spatial coordinate position in the second polarization selective layer is a second polarization device with a specific orientation when powered on and no polarization selectivity when powered off.

[0106] In another feasible embodiment, the polarization selective layer 04 is a third polarization selective layer, and the third polarization selective layer includes an outer layer and an inner layer, wherein the outer layer is a layer away from the surface on the eye-entering side, and the inner layer is a layer close to the surface on the eye-entering side, and any spatial coordinate position in the outer layer is a first polarization device with a specific orientation, or any spatial coordinate position in the outer layer is a second polarization device with a specific orientation when powered on and no polarization selectivity when powered off;

[0107] Any spatial coordinate position in the inner layer is a retarder with a specific fast axis angle and a specific delay amount.

[0108] In this embodiment, the polarization selection layer 04 can be divided into three types: a first polarization selection layer, a second polarization selection layer and a third polarization selection layer. The first polarization selection layer is composed of a first polarization device with a specific orientation. The orientation of the first polarization device can be fixed or adjusted according to needs. The orientations of the first polarization devices at different spatial coordinate positions in the first polarization selection layer can be the same or different, so as to achieve fine control of the polarization state of the optical signal.

[0109] The second polarization selection layer is composed of a second polarization device, which exhibits a specific polarization orientation when powered on and loses polarization selectivity when powered off. This design allows the function of the polarization selection layer 04 to be dynamically controlled by an electrical signal, further enhancing the flexibility and adaptability of the diffraction optical waveguide 100. Similarly, the orientation of the second polarization device can be fixed or adjusted as needed. The orientations of the second polarization devices at different spatial coordinate positions in the second polarization selection layer can be the same or different, so as to achieve fine control of the polarization state of the optical signal.

[0110] The third polarization selection layer adopts a double-layer structure design. The outer layer (i.e., the layer away from the eye-entry side surface or the layer away from the human eye) is either the first polarization selection layer or the second polarization selection layer, which is responsible for the preliminary regulation of the polarization state of the optical signal. The inner layer (i.e., the layer close to the eye-entry side surface or the layer close to the human eye) is composed of a retarder with a specific fast axis angle and a specific delay amount. The retarder can finely adjust the phase of the optical signal, thereby further optimizing the polarization state of the optical signal. The fast axis angle and delay amount of the inner layer retarder can also be fixed, or adjusted as needed to adapt to different application scenarios and display requirements.

[0111] In this way, through the design of the first polarization selection layer, the second polarization selection layer or the third polarization selection layer, the polarization state of the optical signal can be accurately controlled to reduce light leakage caused by polarization mismatch.

[0112] In a feasible embodiment, the outer array of the third polarization selective layer is aligned with the inner array and stacked.

[0113] The third polarization selection layer adopts a double-layer array structure, in which the outer array is aligned with the inner array to ensure that the optical signal can be uniformly polarized and phase-controlled when passing through this layer; the outer layer and the inner layer are stacked, which can be tightly fitted to reduce interface reflection and scattering, or a small gap can be left to adjust the optical performance or accommodate other functional layers. In this way, the accuracy of polarization selection is guaranteed, and the flexibility of structural design is given.

[0114] In a feasible embodiment, the polarization selection layer 04 is any one of a dichroic polarization film array layer, a crystal polarization film array layer, a wire grid polarization film array layer, a plastic polarization film array layer or a liquid crystal array layer.

[0115] In order to meet different application scenarios and performance requirements, the polarization selection layer 04 can adopt an array layer composed of different materials according to application requirements, including but not limited to a dichroic polarization film array layer, a crystal polarization film array layer, a wire grid polarization film array layer, a plastic polarization film array layer and a liquid crystal array layer. Each material has its own unique polarization selection characteristics and environmental adaptability. By selecting suitable materials, the transmission efficiency and display effect of the optical signal can be optimized.

[0116] In addition, it should be noted that the present embodiment does not impose any specific limitation on the number of array arrangements of the polarization selection layers 04 of the diffractive optical waveguide 100 , and the number can be set to range from 1×1 to 10000×10000 according to actual application scenarios.

[0117] In a feasible embodiment, the diffraction optical waveguide 100 further includes a turning grating (not shown), and the turning grating is arranged between the coupling-in grating 02 and the coupling-out grating 03 .

[0118] The diffraction optical waveguide 100 may further include a turning grating, which is disposed between the coupling-in grating 02 and the coupling-out grating 03, and whose function is to change the propagation path of the optical signal inside the waveguide, thereby achieving effective turning and distribution of the light. The number of the turning grating, the coupling-in grating 02 and the coupling-out grating 03 may be set to one or more according to actual needs, and through their synergistic effect, a complex and efficient optical transmission network may be constructed.

[0119] In addition, in order to adapt to different manufacturing processes and performance requirements, the turning grating, the coupling-in grating 02 and the coupling-out grating 03 can adopt different types of grating structures according to application requirements. The turning grating can be any one of surface relief grating, volume holographic grating, super-surface liquid crystal grating and photonic crystal, the coupling-in grating 02 can be any one of surface relief grating, volume holographic grating, super-surface liquid crystal grating and photonic crystal, and the coupling-out grating 03 can also be any one of surface relief grating, volume holographic grating, super-surface liquid crystal grating and photonic crystal. These grating types have their own characteristics. For example, the surface relief grating forms a grating structure through physical etching, which has the advantages of simple preparation and low cost; the volume holographic grating uses holographic recording technology to realize a three-dimensional grating structure, which has higher diffraction efficiency and angle selectivity; the super-surface liquid crystal grating and photonic crystal represent the development direction of future optical technology, and bring a broader performance improvement space for the diffraction optical waveguide 100.

[0120] The present application also provides a polarization selection layer function setting device, which is applied to the diffraction optical waveguide of the second embodiment, wherein the diffraction optical waveguide includes a polarization selection layer, please refer to Figure 7 , the polarization selection layer function setting device comprises:

[0121] A polarization state image determination module 10, for generating a polarization state image of light when the light source is coupled out on the world side surface of the diffractive optical waveguide according to the polarization state of the light source and the polarization response of the diffractive optical waveguide;

[0122] An orthogonal polarization state image determination module 20, configured to determine an orthogonal polarization state image according to the light polarization state image;

[0123] An array fitting module 30, used for fitting according to the orthogonal polarization state image and a preset array density to obtain a polarization selective layer array;

[0124] The function setting module 40 is used to set the function of the polarization selection layer according to the polarization selection layer array, so that the polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0125] Optionally, the polarization selection layer is a first polarization selection layer, and the function setting module 40 is further used for:

[0126] The spatial coordinate position and target orientation of each first polarization element in the first polarization selection layer are determined according to the polarization selection layer array, so that the first polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

[0127] Optionally, the polarization selective layer is a second polarization selective layer, and the function setting module 40 is further configured to:

[0128] The spatial coordinate position and target orientation of each second polarization element in the second polarization selection layer are determined according to the polarization selection layer array, so that the second polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface when powered on.

[0129] Optionally, the polarization selective layer is a third polarization selective layer, and the function setting module 40 is further used for:

[0130] Determining the spatial coordinate position and target orientation of each first polarization device or second polarization device in the outer layer of the third polarization selection layer according to the polarization selection layer array;

[0131] According to the spatial coordinate position and target orientation of each first polarizer or second polarizer in the outer layer, the fast axis angle and delay amount of each delay device in the inner layer of the third polarization selection layer are determined, so that the third polarization selection layer can significantly suppress or eliminate the outcoupled light from the world side surface.

[0132] The polarization selection layer function setting device provided in the embodiment of the present application adopts the polarization selection layer function setting method in the above embodiment, which can suppress the light leakage problem of the diffraction light waveguide. Compared with the prior art, the beneficial effects of the polarization selection layer function setting device provided in the embodiment of the present application are the same as the beneficial effects of the polarization selection layer function setting method provided in the above embodiment, and other technical features in the polarization selection layer function setting device are the same as the features disclosed in the polarization selection layer function setting method in the above embodiment, which will not be described in detail here.

[0133] The embodiment of the present application further provides a display device, the display device includes the diffraction light waveguide of the above-mentioned embodiment 2, and the display device is an augmented reality display device or a mixed reality display device.

[0134] An embodiment of the present application provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the polarization selection layer function setting method in the above-mentioned embodiment one.

[0135] Reference below Figure 8 , which shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiments of the present application. The electronic device in the embodiments of the present application may include but is not limited to terminals such as personal computers, desktop computers, etc. Figure 8 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0136] like Figure 8As shown, the electronic device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the electronic device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows an electronic device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0137] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0138] The electronic device provided in the embodiment of the present application adopts the method for setting the function of the polarization selection layer in the above embodiment, which can suppress the light leakage problem of the diffraction optical waveguide. Compared with the prior art, the beneficial effects of the electronic device provided in the embodiment of the present application are the same as the beneficial effects of the method for setting the function of the polarization selection layer provided in the above embodiment, and the other technical features in the electronic device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0139] It should be understood that the various parts disclosed in the embodiments of the present application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0141] An embodiment of the present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, and the computer-readable program instructions are used to execute the method for setting the function of the polarization selection layer in the above embodiment.

[0142] The computer-readable storage medium provided in the embodiment of the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0143] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by an electronic device, the electronic device: generates a polarization state image of light when the light source is coupled out from the world-side surface of the diffraction light waveguide according to the polarization state of the light source and the polarization response of the diffraction light waveguide; determines an orthogonal polarization state image according to the polarization state image of the light; obtains a polarization selection layer array by fitting the orthogonal polarization state image and a preset array density; and sets the function of the polarization selection layer according to the polarization selection layer array, so that the polarization selection layer significantly suppresses or eliminates the coupled-out light from the world-side surface.

[0144] The computer program code for performing the operation of the embodiment of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0145] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0146] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0147] The readable storage medium provided in the embodiment of the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned method for setting the function of the polarization selection layer, and can suppress the light leakage problem of the diffraction optical waveguide. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the embodiment of the present application are the same as the beneficial effects of the method for setting the function of the polarization selection layer provided in the above-mentioned embodiment, and will not be described in detail here.

[0148] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for setting the function of a polarization selective layer, characterized in that: The method is applied to a diffractive optical waveguide, the diffractive optical waveguide comprising a polarization selective layer, and the method comprises: Generate a polarization state image of light when the light source is coupled out on the world-side surface of the diffractive optical waveguide according to the polarization state of the light source and the polarization response of the diffractive optical waveguide; Determine an orthogonal polarization state image according to the light polarization state image; Fitting the orthogonal polarization state images and a preset array density to obtain a polarization selection layer array, wherein the array density is the distribution density of polarization devices in the polarization selection layer; The functional parameters of the polarization selective layer are set according to the polarization selective layer array, so that the polarization selective layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

2. The method for setting the function of the polarization selection layer according to claim 1, wherein: The polarization selection layer is a first polarization selection layer, and the step of setting the functional parameters of the polarization selection layer according to the polarization selection layer array so that the polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface comprises: The spatial coordinate position and target orientation of each first polarization element in the first polarization selection layer are determined according to the polarization selection layer array, so that the first polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface.

3. The method for setting the function of the polarization selection layer according to claim 1, wherein: The polarization selection layer is a second polarization selection layer, and the step of setting the functional parameters of the polarization selection layer according to the polarization selection layer array so that the polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface comprises: The spatial coordinate position and target orientation of each second polarization element in the second polarization selection layer are determined according to the polarization selection layer array, so that the second polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface when powered on.

4. The method for setting the function of a polarization selection layer according to claim 1, wherein: The polarization selection layer is a third polarization selection layer, and the step of setting the functional parameters of the polarization selection layer according to the polarization selection layer array so that the polarization selection layer can significantly suppress or eliminate the outcoupled light from the world-side surface comprises: Determining the spatial coordinate position and target orientation of each first polarization device or second polarization device in the outer layer of the third polarization selection layer according to the polarization selection layer array; According to the spatial coordinate position and target orientation of each first polarizer or second polarizer in the outer layer, the fast axis angle and delay amount of each delay device in the inner layer of the third polarization selection layer are determined, so that the third polarization selection layer can significantly suppress or eliminate the outcoupled light from the world side surface.

5. A diffractive optical waveguide, characterized in that: The diffraction optical waveguide adopts the polarization selection layer function setting method according to any one of claims 1 to 4, and the diffraction optical waveguide comprises: a waveguide substrate, an in-coupling grating, an out-coupling grating and a polarization selection layer; The coupling-in grating and the coupling-out grating are respectively arranged on the surface or inside of the waveguide substrate, and the surface of the waveguide substrate includes an eye-side surface and a world-side surface; The polarization selection layer is disposed inside the waveguide substrate or on the world-side surface.

6. The diffractive optical waveguide according to claim 5, characterized in that: The polarization selection layer is a first polarization selection layer, and any spatial coordinate position in the first polarization selection layer is a first polarization device with a specific orientation.

7. The diffractive optical waveguide according to claim 5, characterized in that: The polarization selection layer is a second polarization selection layer, and any spatial coordinate position in the second polarization selection layer is a second polarization device with a specific orientation when powered on and no polarization selectivity when powered off.

8. The diffractive optical waveguide according to claim 5, characterized in that: The polarization selective layer is a third polarization selective layer, and the third polarization selective layer includes an outer layer and an inner layer, wherein the outer layer is a layer away from the eye-entering side surface, and the inner layer is a layer close to the eye-entering side surface, and any spatial coordinate position in the outer layer is a first polarizer with a specific orientation, or any spatial coordinate position in the outer layer is a second polarizer with a specific orientation when powered on and no polarization selectivity when powered off; Any spatial coordinate position in the inner layer is a retarder with a specific fast axis angle and a specific delay amount.

9. The diffractive optical waveguide according to claim 8, characterized in that: The outer array of the third polarization selective layer is aligned with the inner array and stacked.

10. The diffractive optical waveguide according to claim 5, characterized in that: The polarization selection layer is any one of a dichroic polarizing film array layer, a crystal polarizing film array layer, a wire grid polarizing film array layer, a plastic polarizing film array layer or a liquid crystal array layer.

11. The diffractive optical waveguide according to claim 5, characterized in that: The diffraction optical waveguide further comprises a turning grating, and the turning grating is arranged between the coupling-in grating and the coupling-out grating.

12. A display device, characterized in that: The display device comprises the diffractive optical waveguide according to any one of claims 5 to 11, and the display device is an augmented reality display device or a mixed reality display device.

13. An electronic device, characterized in that: The electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for setting the function of a polarization selective layer according to any one of claims 1 to 4.

14. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the method for setting the function of a polarization selection layer according to any one of claims 1 to 4 are implemented.

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