Display device, vehicle and display method

Abstract

The invention discloses a display device, a vehicle and a display method. The display device comprises a backlight layer, a waveguide layer, a liquid crystal layer, a diffusion layer and a pixel grating layer which are arranged in a stacked mode, the waveguide layer comprises a waveguide element and a waveguide light source, and the diffusion layer is used for diffusing the angle range of incident light into a preset angle; when the display device works in a 2D display mode, the backlight layer and the liquid crystal layer work, and the waveguide layer, the diffusion layer and the pixel grating layer are used for transmitting light. When the display device works in a 3D display mode, the waveguide light source and the liquid crystal layer work, and the pixel grating layer is used for adjusting the diffraction angle of incident light so as to respectively display corresponding images in different visual areas. Image display of 2D and 3D display modes can be compatible, naked eye 3D imaging can be realized without reducing the resolution of the 2D display mode, and the use experience of a user is enhanced.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to a display device, a vehicle, and a display method. Background Art

[0002] Display devices are key media for information dissemination and are widely used in devices such as televisions, vehicles, and mobile phones, enabling people to easily access news, entertainment, and other information. In vehicles, displays provide users with navigation information, driver assistance information, and entertainment information, enhancing travel convenience and the driving experience.

[0003] Traditional display devices can only display 2D images or only display 3D images, have poor flexibility, and cannot meet users' needs for switching between viewing 2D images and viewing 3D images in a timely manner. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a display device, a vehicle, and a display method that are compatible with image display in both 2D and 3D display modes, enabling naked-eye 3D imaging without reducing the resolution of the 2D display mode, thereby enhancing the user experience.

[0005] In a first aspect, the present application provides a display device comprising a stacked backlight layer, a waveguide layer, a liquid crystal layer, a diffusion layer, and a pixel grating layer, wherein the waveguide layer comprises a waveguide element and a waveguide light source, and the diffusion layer is configured to diffuse the angle range of incident light to a preset angle;

[0006] When the display device operates in a 2D display mode, the backlight layer and the liquid crystal layer are in operation, and the waveguide layer, the diffusion layer, and the pixel grating layer are used to transmit light;

[0007] When the display device operates in a 3D display mode, the waveguide light source and the liquid crystal layer operate, and the pixel grating layer is used to adjust the diffraction angle of the incident light so as to display corresponding images in different viewing areas.

[0008] In a second aspect, the present application provides a vehicle, which includes the above-mentioned display device.

[0009] In a third aspect, the present application provides a display method, which is applied to a display device, wherein the display device includes a backlight layer, a waveguide layer, a liquid crystal layer, a diffusion layer, and a pixel grating layer arranged in a stacked manner, wherein the waveguide layer includes a waveguide element and a waveguide light source, and the method includes:

[0010] When the display device operates in a 2D display mode, the backlight layer and the liquid crystal layer are controlled to operate, and the waveguide element, the diffusion layer, and the pixel grating layer are used to transmit light. When the display device operates in a 3D display mode, the waveguide light source and the liquid crystal layer are controlled to operate, the diffusion layer is used to diffuse the angle range of the incident light to a preset angle, and the pixel grating layer is used to adjust the diffraction angle of the incident light so as to display corresponding images in different viewing areas.

[0011] The display device, vehicle, and display method provided by the embodiments of the present application utilize a stacked backlight layer, waveguide layer, liquid crystal layer, diffusion layer, and pixel grating layer. In 2D display mode, the display device emits a 2D light source through the backlight layer, which is then modulated by the liquid crystal layer, separating the 2D light source into different colors for display. The waveguide layer, diffusion layer, and pixel grating layer transmit light without sacrificing 2D display resolution. In 3D display mode, the 3D light source is introduced into the waveguide layer for transmission and decoupling, then enters the liquid crystal layer for modulation, separating the 3D light source into different colors. The diffusion layer diffuses the angle range of the incoming light to a preset angle, allowing the pixel grating layer to modulate and diffract the light emitted from the diffusion layer to form different viewing zones, resulting in a more continuous 3D image for the user.

[0012] In this way, image display in both 2D and 3D display modes can be compatible, and naked-eye 3D imaging can be achieved without reducing the resolution of the 2D display mode, thereby enhancing the user experience.

[0013] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 This is an application scenario diagram of the display device and display method provided in the embodiments of the present application;

[0016] Figure 2 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0017] Figure 3 is a schematic structural diagram of a pixel grating layer of a display device provided in an embodiment of the present application;

[0018] Figure 4 Schematic diagram of the optical path of the display device provided in an embodiment of the present application when operating in a 2D display mode;

[0019] Figure 5 Schematic diagram of the optical path of the display device provided in an embodiment of the present application when operating in a 3D display mode;

[0020] Figure 6 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the first flow chart of the display method provided in an embodiment of the present application;

[0022] Figure 8 This is a second flow chart of the display method provided in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1000-vehicle; 100-display device; 200-target display area; 10-backlight layer; 20-waveguide layer; 21-waveguide light source; 22-waveguide element; 23-waveguide grating layer; 24-waveguide grating; 30-liquid crystal layer; 31-first substrate; 32-polarizing plate; 33-liquid crystal; 34-filter assembly; 35-red filter; 36-green filter; 37-blue filter; 40-diffusion layer; 50-pixel grating layer; 51-second substrate; 52-pixel grating group; 53-pixel grating unit; 54-single pixel grating; 55-first sub-pixel grating; 56-second sub-pixel grating; 57-third sub-pixel grating. DETAILED DESCRIPTION

[0025] The following further describes the embodiments of the present application in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. Furthermore, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are intended only to explain the embodiments of the present application and are not to be construed as limiting the present application.

[0026] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0027] For ease of understanding, the following first introduces the technical background and application scenarios of this application:

[0028] Display devices play a crucial role in modern society. In public places like airports, train stations, and shopping malls, they display flight information, train schedules, and advertisements, facilitating travel and shopping, and improving social efficiency. Displays can display documents, images, and video conference content, facilitating information processing, communication, and collaboration, significantly improving work efficiency.

[0029] The instrument panel, central control screen, and other components of a vehicle are essential components. As the most basic display device, the instrument panel can display important operating information such as speed, RPM, fuel level, and water temperature in real time, allowing users to be informed of the vehicle's status at all times. The central control screen can display detailed navigation and map information for users to easily change their planned routes. It can also display reversing images and surrounding information, effectively avoiding collisions when reversing, parking, or navigating narrow roads, enhancing driving safety and convenience. The central control screen can also play videos for users, making long-distance travel less boring and improving driving comfort.

[0030] See also Figure 1 , Figure 1 1 is an application scenario diagram of a display device 100 and a display method provided in an embodiment of the present application. The application scenario provided in the present application includes a display device 100 and a target display area 200.

[0031] The display device 100 is used to emit light into the target display area 200 .

[0032] The target display area 200 may be the spatial area where at least one of the viewer's eyes are located. Light emitted by the display device 100 enters the viewer's eyes. Based on the light entering the eyes, the viewer's brain can combine previous experience and other sensory information to ultimately form a two-dimensional or three-dimensional image.

[0033] See also Figure 2 Based on the introduction of the above-mentioned related scenarios, a display device 100 provided in an embodiment of the present application is described in detail below.

[0034] The display device 100 includes a backlight layer 10, a waveguide layer 20, a liquid crystal layer 30, a diffusion layer 40, and a pixel grating layer 50. The waveguide layer 20 includes a waveguide light source 21 and a waveguide element 22. The diffusion layer 40 is used to diffuse the angle range of the incident light entering the diffusion layer 40 to a preset angle.

[0035] The preset angle is an angle value set based on the display requirements in the 3D display mode. For example, if the display effect in the 3D display mode requires the angle range of the light emitted from the diffusion layer 40 to be 3 degrees, the preset angle is 3 degrees.

[0036] The stacked backlight layer 10, waveguide layer 20, liquid crystal layer 30, diffusion layer 40, and pixel grating layer 50 have matching areas, so that when the display device 100 operates in a 2D display mode, light emitted by the backlight layer 10 passes through the waveguide layer 20, liquid crystal layer 30, diffusion layer 40, and pixel grating layer 50 in sequence for display; the two waveguide light sources 21 are respectively located on both sides of the waveguide element 22. When the display device 100 operates in a 3D display mode, light emitted by the waveguide light sources 21 enters the waveguide element 22 and then passes through the liquid crystal layer 30, diffusion layer 40, and pixel grating layer 50 in sequence for display.

[0037] When the display device 100 operates in a 2D display mode, the backlight layer 10 and the liquid crystal layer 30 are in operation, and the waveguide layer 20 , the diffusion layer 40 and the pixel grating layer 50 are used to transmit light.

[0038] In 2D display mode, the backlight layer 10 emits white light or other colored backlight sources. White light is a mixture of the three primary colors of red, green, and blue. The liquid crystal layer 30 modulates the white light to accurately display various colors. In some professional medical settings, the backlight layer 10 emits specific wavelengths of blue or green light to enhance the display of certain medical image details, helping medical personnel more accurately diagnose conditions.

[0039] Optionally, the light source emitted by the backlight layer 10 can be a point-shaped, linear or planar light source, and the backlight layer 10 can be an LED, a cold cathode fluorescent lamp, a quantum dot light-emitting diode (QLED), an organic light-emitting diode (OLED), etc., which is not limited in the embodiments of the present application.

[0040] In 2D display mode, light from the backlight layer 10 passes through the waveguide layer 20 and enters the liquid crystal layer 30. The liquid crystal layer 30 modulates the incident light, controlling the transmission and blocking of different colors of light to accurately achieve full-color display. The light then passes through the diffusion layer 40 and the pixel grating layer 50 in sequence for accurate full-color display without sacrificing 2D display resolution, thus avoiding a reduction in the user experience when viewing 2D images.

[0041] When the display device 100 operates in a 3D display mode, the waveguide light source 21 and the liquid crystal layer 30 operate, and the pixel grating layer 50 is used to adjust the diffraction angle of the incident light so as to display corresponding images in different viewing areas.

[0042] In the 3D display mode, the light emitted by the waveguide light source 21 enters the waveguide element 22. Light of different colors is dispersed in the waveguide element 22 due to different wavelengths. It is then reflected and diffracted out of the waveguide layer 20 by other components in the waveguide layer 20 and enters the liquid crystal layer 30. The liquid crystal layer 30 modulates the incident light to accurately achieve full-color display. The diffusion layer 40 diffuses the angle range of the incident light entering the diffusion layer 40 to a preset angle. The pixel grating layer 50 adjusts the diffraction angle of the incident light entering the pixel grating layer 50 so that the outgoing light of the pixel grating layer 50 can display the corresponding image in each viewing area in the corresponding target display area 200.

[0043] This allows the user's eyes to observe images in each viewing area in the target display area 200, ultimately achieving naked-eye 3D, so that the user can watch three-dimensional images without wearing auxiliary equipment (such as 3D glasses or 3D helmets).

[0044] Please continue reading Figure 2 , the waveguide layer 20 of the present application is explained in detail below:

[0045] The waveguide element 22 includes a top surface, a bottom surface and a side surface. The top surface faces the liquid crystal layer 30 , the bottom surface faces the backlight layer 10 , the side surface connects the top surface and the bottom surface, and the incident surface of the waveguide element 22 is the side surface.

[0046] The side surface includes a first incident surface and a second incident surface, and the light incident on the first incident surface and the second incident surface is displayed in different display areas respectively.

[0047] The waveguide element 22 is a rectangular parallelepiped. The first incident surface and the second incident surface of the waveguide element 22 correspond to a waveguide light source 21 respectively. The light emitted by the waveguide light source 21 enters the corresponding side surfaces respectively. The light entering the first incident surface and the light entering the second incident surface can be respectively in different target display areas 200, so that the display device 100 can provide 3D image display for one or two users at the same time without affecting each other.

[0048] The waveguide layer 20 further includes a waveguide grating layer 23 , which is disposed on the top surface or the bottom surface; the waveguide grating layer 23 is located inside or outside the waveguide element 22 .

[0049] The waveguide grating layer 23 includes a top surface and a bottom surface. The waveguide grating layer 23 includes a plurality of waveguide gratings 24 arranged in an array. The waveguide gratings 24 are rectangular parallelepipeds and include a top surface, a bottom surface, and side surfaces. The top surface of each waveguide grating 24 is located on the top surface of the waveguide grating layer 23, and the bottom surface of each waveguide grating 24 is located on the bottom surface of the waveguide grating layer 23.

[0050] Optionally, the connection relationship between the waveguide grating layer 23 and the waveguide element 22 can be that the waveguide grating layer 23 is located outside the waveguide element 22, and the top surface of the waveguide grating layer 23 and the bottom surface of the waveguide element 22 are located in the same plane; the waveguide grating layer 23 is located outside the waveguide element 22, and the bottom surface of the waveguide grating layer 23 and the top surface of the waveguide element 22 are located in the same plane; the waveguide grating layer 23 is located inside the waveguide element 22, and the bottom surface of the waveguide grating layer 23 and the bottom surface of the waveguide element 22 are located in the same plane; the waveguide grating layer 23 is located inside the waveguide element 22, and the top surface of the waveguide grating layer 23 and the top surface of the waveguide element 22 are located in the same plane.

[0051] Please continue reading Figure 2 , Figure 2 It is exemplarily shown that the waveguide grating layer 23 is located outside the waveguide element 22, and the top surface of the waveguide grating layer 23 and the bottom surface of the waveguide element 22 are located in the same plane.

[0052] The parameters of the waveguide grating layer 23 are determined based on the light incident direction of the waveguide element 22 and the light emitting direction of the pixel grating layer 50 .

[0053] The parameters (such as period, duty cycle, etc.) of each waveguide grating 24 in the waveguide grating layer 23 are specific. The light input direction of the waveguide element 22 is determined based on the relative position of the waveguide light source 21 and the waveguide element 22. The light output direction of the pixel grating layer 50 is determined based on the various viewing zones of the target display area 200.

[0054] For example, when the relative positions of the waveguide light source 21 and the waveguide element 22 and the various viewing zones of the target display area 200 are determined, any target light emitted by the waveguide light source 21 enters the waveguide element 22 and is dispersed. After being reflected and diffracted by the corresponding target waveguide grating 24, the specific parameters of the target waveguide ensure that the direction and angle of the target light leaving the waveguide layer 20 are determined. The target light then passes through the liquid crystal layer 30, the diffusion layer 40 and the pixel grating layer 50 in sequence for modulation, and finally, after being emitted from the display device 100, it can enter the corresponding target viewing zone in the target display area 200 to display an image.

[0055] Optionally, the waveguide grating layer 23 can be replaced by a semi-transparent and semi-reflective film, a volume holographic grating waveguide or a diffraction optical waveguide, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0056] Please continue reading Figure 2 , the liquid crystal layer 30 of the present application is explained in detail below:

[0057] The liquid crystal layer 30 includes a first substrate 31, a polarizing plate 32, a liquid crystal 33 and a filter assembly 34. The polarizing plate 32, the liquid crystal 33 and the filter are arranged in an array in the first substrate 31. The filter assembly 34 includes a first filter 35, a second filter 36 and a third filter 37 arranged in parallel and of the same size. The first filter 35, the second filter 36 and the third filter 37 can correspond to a red filter, a green filter and a blue filter, or can correspond to a red filter, a blue filter and a green filter, etc., which is not limited in this embodiment of the present application. The liquid crystal 33 can have a polarizing plate 32 only in front, or can have polarizing plates 32 in front and behind. Figure 2 In the example, there is a polarizing plate 32 in front of and behind the liquid crystal 33. The liquid crystal 33 and the polarizing plates 32 in front of and behind it correspond to a filter in the filter assembly 34 one by one.

[0058] Polarizer 32 converts incident light entering liquid crystal layer 30 into polarized light. This polarized light then passes through the corresponding liquid crystals 33 under the influence of an electric field, modulating the polarization direction of the incident light to varying degrees, thereby changing the propagation path and intensity of the incident light. Filters effectively filter out unwanted light, allowing only light of specific colors to pass through, thereby improving color purity and making images more vivid and accurate.

[0059] Optionally, the type of the liquid crystal layer 30 may be twisted nematic, super twisted nematic, vertical alignment, in-plane switching, etc., which is not limited in the embodiment of the present application.

[0060] Please continue reading Figure 2 , the diffusion layer 40 of the present application is explained in detail below:

[0061] The diffusion layer 40 includes a directional diffusion film.

[0062] The diffusion layer 40 is located between the liquid crystal layer 30 and the pixel grating layer 50 and is used to diffuse the incident light entering the diffusion layer 40 to a preset angle to expand the field of view, so that the outgoing light of the diffusion layer 40 can form a corresponding viewing area after passing through the corresponding pixel grating layer 50.

[0063] Optionally, the diffusion layer 40 may be a micro-nano optical film or functional device with the ability to diffuse light beams, such as a directional diffusion film, a microlens array film, or a light diffuser, and the embodiment of the present application does not limit this.

[0064] Please continue reading Figure 2 and see Figure 3 , the pixel grating layer 50 of the present application is explained in detail below:

[0065] The pixel grating layer 50 is used to adjust the diffraction direction of incident light of different colors so that the corresponding outgoing light can enter the corresponding viewing area for display.

[0066] The pixel barrier layer 50 includes a second substrate 51 and a pixel barrier group 52 located on the second substrate 51. The second substrate 51 can be a transparent glass substrate, etc., which is not limited in this embodiment of the present application. The pixel barrier group 52 includes multiple pixel barrier units 53, each of which includes multiple single-pixel barriers 54. The single-pixel barriers 54 correspond one-to-one to the viewing zones displayed by the display device 100 in 3D display mode. The greater the number of viewing zones in the target display area 200, the smoother the 3D effect of the target display area 200 to the human eye, but the resolution will be reduced.

[0067] Please continue reading Figure 3 Each single-pixel grating 54 includes a first sub-pixel grating 55, a second sub-pixel grating 56 and a third sub-pixel grating 57 corresponding to different wavelengths. Each sub-pixel grating is used to modulate the incident light of the corresponding wavelength into parallel light. The structure of the single-pixel grating 54 corresponding to different viewing areas is different.

[0068] The grating parameters of each sub-pixel grating in the single-pixel grating 54 corresponding to different viewing zones are different. The grating parameters include at least one of a grating period and a duty cycle.

[0069] Each target single-pixel grating 54 corresponds to a target filter assembly 34 in the liquid crystal layer 30 and a target viewing area in the target display area 200. Each first sub-pixel grating 55 in the target single-pixel grating 54 corresponds to the first filter 35 in the target filter assembly 34; each second sub-pixel grating 56 corresponds to the second filter 36 in the target filter assembly 34; and each third sub-pixel grating 57 corresponds to the third filter 37 in the target filter assembly 34. Each light beam that passes through the target filter assembly 34 is expanded by the diffusion layer 40 and then enters the target single-pixel grating 54. After being diffracted by the corresponding sub-pixel grating, each light beam becomes parallel light and enters the target viewing area for display.

[0070] Optionally, each sub-pixel grating in the pixel grating group 52 can be a traditional one-dimensional diffraction grating, a slope grating, a step grating or other micro-nano structure with the same effect, which is not limited in the embodiment of the present application.

[0071] See also Figure 4 , Figure 4 2D is a schematic diagram of the optical path when the display device 100 operates in the 2D display mode.

[0072] The target light emitted by the backlight passes through the waveguide layer 20 and enters the liquid crystal layer 30. The liquid crystal layer 30 modulates the target light, controlling the transmission and blocking of different colors of light to accurately achieve full-color display. The target light then passes through the diffusion layer 40 and the pixel grating layer 50 in sequence to produce the desired 2D full-color display. Because the target light is uniform in all directions, the further diffusion of the target light through the waveguide layer 20, the diffusion layer 40, and the pixel grating layer 50 does not affect the resolution of the 2D display.

[0073] See also Figure 5 , Figure 5 3D is a schematic diagram of the optical path when the display device 100 operates in the 3D display mode.

[0074] The waveguide light source 21 emits a target light beam into the waveguide element 22. The target light beam is dispersed within the waveguide element 22, breaking down into different colors. After passing through the waveguide grating 24 with specific parameters, a portion of the light of different colors is reflected and diffracted out of the waveguide layer 20 and into the liquid crystal layer 30. Another portion is transmitted and then subjected to total internal reflection to enter the next cycle. The liquid crystal layer 30 modulates the incident light beam, controlling the transmission and blocking of different colors of light, achieving precise full-color display. The diffusion layer 40 then diffuses the incident light beam to a preset angle. The light beam, having been diffused to the preset angle, is then diffracted by the corresponding sub-pixel grating and ultimately emitted from the display device 100 into the target viewing area for display.

[0075] See also Figure 6 , an embodiment of the present application further provides a vehicle 1000 , which includes the above-mentioned display device 100 .

[0076] In some embodiments, the display device 100 can be positioned directly in front of the two front seats of the vehicle 1000. Thus, when the display device 100 operates in 3D display mode, the display device 100 can provide corresponding 3D viewing images for the two front passengers, without interfering with each other's 3D viewing images. The display device 100 can also be positioned in the center of the front and back sides of the front seats of the vehicle 1000. Thus, when the display device 100 operates in 3D display mode, the display device 100 can provide 3D viewing images for rear passengers facing the display device 100.

[0077] See also Figure 7 A display method provided in an embodiment of the present application is applied to the above-mentioned display device 100. The display method is implemented by steps 011 and 012, which are described in detail below.

[0078] Step 011: When the display device 100 operates in a 2D display mode, the backlight layer 10 and the liquid crystal layer 30 are controlled to operate, and the waveguide element 22, the diffusion layer 40 and the pixel grating layer 50 are used to transmit light;

[0079] Step 012: When the display device 100 operates in 3D display mode, the waveguide light source 21 and the liquid crystal layer 30 are controlled to operate, the diffusion layer 40 is used to diffuse the angle range of the incident light to a preset angle, and the pixel grating layer 50 is used to adjust the diffraction angle of the incident light to display corresponding images in different viewing areas.

[0080] Specifically, when the display device 100 operates in 2D display mode, the backlight panel is controlled to emit target light. The target light passes through the waveguide layer 20 and enters the liquid crystal layer 30. The liquid crystal layer 30 is controlled to modulate the target light to accurately display the 2D image source in full color. The target light then passes through the diffusion layer 40 and the pixel grating layer 50 in sequence, ultimately presenting the desired 2D full-color display effect. Because the target light is emitted in all directions, the target light passing through the waveguide layer 20, the diffusion layer 40, and the pixel grating layer 50 and then diffused does not affect the resolution of the 2D display.

[0081] When the display device 100 operates in a 3D display mode, the light emitted by the waveguide light source 21 is controlled to enter the waveguide element 22. Light of different colors is dispersed in the waveguide element 22 due to different wavelengths, and then is reflected and diffracted out of the waveguide layer 20 by the waveguide grating 24 component in the waveguide layer 20 to enter the liquid crystal layer 30; the liquid crystal layer 30 modulates the incident light to accurately realize full-color display of the 3D image source; the diffusion layer 40 diffuses the angle range of the incident light entering the diffusion layer 40 to a preset angle; the pixel grating layer 50 adjusts the diffraction angle of the incident light entering the pixel grating layer 50 so that the outgoing light of the pixel grating layer 50 can display the corresponding image in each viewing area in the corresponding target display area 200, ultimately presenting the required 3D full-color display effect.

[0082] In this way, image display in both 2D and 3D display modes can be compatible, and naked-eye 3D imaging can be achieved without reducing the resolution of the 2D display mode, thereby enhancing the user experience.

[0083] See also Figure 8 Optionally, step 012 includes:

[0084] Step 0121: When the display device 100 operates in a 3D display mode, a target incident surface is determined based on the target display area 200 , where the target incident surface includes at least one of a first incident surface and a second incident surface.

[0085] Step 0122: Control the waveguide light source 21 and the liquid crystal layer 30 corresponding to the target incident surface to operate.

[0086] The target incident surface is the side surface of the waveguide element 22 corresponding to the target display area 200 .

[0087] Specifically, when the display device 100 is operating in 3D display mode, the target display area 200 where the user is located corresponds to the target incident surface. For example, the target display area 200 on the right side of the display device 100 corresponds to the first incident surface, and the target display area 200 on the left side corresponds to the second incident surface. When the user is on the right side of the display device 100, the target incident surface is the first incident surface, and the corresponding waveguide light source 21 and liquid crystal layer 30 are controlled to operate so that light emitted by the display device 100 enters each viewing zone of the user's target display area 200, providing the user with an accurate 3D display image.

[0088] In the description of this specification, the reference terms "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "plurality" means at least two, for example, two or three, unless otherwise specifically defined.

[0090] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0091] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A display device, characterized in that: It includes a backlight layer, a waveguide layer, a liquid crystal layer, a diffusion layer and a pixel grating layer arranged in a stacked manner, wherein the waveguide layer includes a waveguide element and a waveguide light source, and the diffusion layer is used to diffuse the angle range of the incident light into a preset angle; When the display device operates in a 2D display mode, the backlight layer and the liquid crystal layer are in operation, and the waveguide layer, the diffusion layer, and the pixel grating layer are used to transmit light; When the display device operates in a 3D display mode, the waveguide light source and the liquid crystal layer operate, and the pixel grating layer is used to adjust the diffraction angle of the incident light so as to display corresponding images in different viewing areas.

2. The display device according to claim 1, wherein The waveguide element includes a top surface, a bottom surface and a side surface, the top surface is opposite to the liquid crystal layer, the bottom surface is opposite to the backlight layer, the side surface connects the top surface and the bottom surface, and the incident surface of the waveguide element is the side surface.

3. The display device according to claim 2, wherein: The side surface includes a first incident surface and a second incident surface, and light incident on the first incident surface and the second incident surface is displayed in different display areas respectively.

4. The display device according to claim 2 or 3, characterized in that The waveguide layer further includes a waveguide grating layer, and the waveguide grating layer is arranged on the top surface or the bottom surface; The parameters of the waveguide grating layer are determined based on the light incident direction of the waveguide element and the light exiting direction of the pixel grating layer.

5. The display device according to claim 4, wherein: The waveguide grating layer is located inside or outside the waveguide element.

6. The display device according to claim 1, wherein The diffusion layer includes a directional diffusion film.

7. The display device according to claim 1, wherein The pixel grating layer includes a plurality of pixel grating units, and the pixel grating unit includes a plurality of single-pixel gratings. The single-pixel gratings correspond one-to-one to the viewing area displayed by the display device in the 3D display mode.

8. The display device according to claim 7, wherein: The single-pixel grating includes sub-pixel gratings corresponding to different wavelengths. The sub-pixel gratings are used to modulate incident light of corresponding wavelengths into parallel light. The structures of the single-pixel gratings corresponding to different viewing areas are different.

9. The display device according to claim 7, wherein: The grating parameters of the sub-pixel grating in the single-pixel grating corresponding to different viewing zones are different, and the grating parameters include at least one of a grating period and a duty cycle.

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

11. A display method, characterized in that: Applied to a display device, the display device includes a backlight layer, a waveguide layer, a liquid crystal layer, a diffusion layer, and a pixel grating layer arranged in a stacked manner, the waveguide layer including a waveguide element and a waveguide light source, the method comprising: When the display device operates in a 2D display mode, the backlight layer and the liquid crystal layer are controlled to operate, and the waveguide element, the diffusion layer and the pixel grating layer are used to transmit light; When the display device operates in a 3D display mode, the waveguide light source and the liquid crystal layer are controlled to operate, the diffusion layer is used to diffuse the angle range of the incident light to a preset angle, and the pixel grating layer is used to adjust the diffraction angle of the incident light to display corresponding images in different viewing areas.

12. The display method according to claim 11, wherein: The waveguide element includes a first incident surface and a second incident surface, and light incident on the first incident surface and the second incident surface is displayed in different display areas respectively. When the display device operates in a 3D display mode, controlling the waveguide element and the liquid crystal layer to operate includes: When the display device operates in a 3D display mode, determining a target incident surface based on a target display area, the target incident surface including at least one of a first incident surface and a second incident surface; The waveguide light source and the liquid crystal layer corresponding to the target incident surface are controlled to operate.

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