Display device and vehicle

Abstract

The embodiment of the invention provides a display device and a vehicle, relates to the technical field of light display, and aims to solve the problems of complex structure and large occupied area of similar products in the related technology. The display device comprises an image source device and a first projection lens. The image source device is used for forming imaging light and projecting the imaging light to a conjugate surface located on the light inlet side of the first projection lens; the first projection lens is used for projecting the imaging light passing through the conjugate surface to the eye box surface. The conjugate surface and the eye box surface are conjugate relative to the first projection lens, the conjugate surface comprises a first area and a second area, and the eye box surface comprises a left eye box area and a right eye box area; the imaging light passing through the first area is projected to the left eye box area by the first projection lens, and the imaging light passing through the second area is projected to the right eye box area by the first projection lens. The display equipment can be applied to a head-up display device.

Description

Technical Field

[0001] This application relates to the field of optical display technology, and more particularly to a display device and a vehicle. Background Technology

[0002] A head-up display (HUD) is a device used in automobiles to project driving-related information, such as instrument panel and navigation information, into the driver's field of vision. This allows the driver to access driving-related information without looking down at the instrument panel or navigation device, thus improving driving safety.

[0003] To better integrate the information projected by head-up displays (HUDs) with the driving scenario, stereoscopic display technologies based on the principle of binocular parallax, especially glasses-free stereoscopic display technology, have begun to be applied to HUDs. However, there is still room for improvement in the stereoscopic display effect of HUDs in these technologies. Summary of the Invention

[0004] This application provides a display device and a vehicle for improving the display effect of the display device when realizing stereoscopic display.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a display device, which includes an image source device and a first projection lens; wherein the image source device is used to form imaging light and project the imaging light onto a conjugate surface located on the light-inlet side of the first projection lens; the first projection lens is used to project the imaging light passing through the conjugate surface onto the eye box surface.

[0007] The conjugate surface and the eye box surface are conjugate with respect to the first projection lens. The conjugate surface includes a first region and a second region. The eye box surface includes a left eye box region and a right eye box region. The imaging light passing through the first region is projected onto the left eye box region by the first projection lens, and the imaging light passing through the second region is projected onto the right eye box region by the first projection lens.

[0008] In the display device provided in this application embodiment, by utilizing the conjugate relationship between the conjugate surface and the eye box surface, and by controlling the imaging light emitted from the first and second regions of the conjugate surface, it is possible to project different imaging lights onto the left and right eye box regions of the eye box surface respectively. When the imaging light projected onto the left and right eye box regions is imaging light that achieves stereoscopic display based on the principle of binocular parallax, a stereoscopic display effect can be achieved. Compared with stereoscopic display devices in related technologies that use barrier gratings, cylindrical lens arrays, etc. for beam splitting, this design, on the one hand, can improve the problem that moiré patterns are easily generated due to the periodic staggered distribution of barrier gratings and cylindrical lens arrays with the image source device, thus affecting the display effect; thereby improving the display effect. On the other hand, it can not only match well with the imaging light generated by the flat panel display screen, but also match well with the imaging light generated by the projection optical engine, thereby improving the problem that stereoscopic display devices in related technologies that use barrier gratings and cylindrical lens arrays for beam splitting have requirements on the type of image source device and are relatively limited; it has better adaptability.

[0009] It can be seen that the display device provided in this application embodiment is compatible with different types of image source devices such as projection optical engines and flat panel displays, and can be applied to different application scenarios, and all have good display effects.

[0010] In addition, compared with stereoscopic display devices that use barrier gratings, cylindrical lens arrays, etc. for light splitting in related technologies, the display device provided in this application has the advantages of simple structure, reduced manufacturing difficulty, and high reliability.

[0011] In some scenarios, display devices can arbitrarily change the perceived depth of the displayed content through stereoscopic display functions, thus forming a multi-focal-plane display system with continuously adjustable focal plane positions. When this multi-focal-plane display system is applied to a head-up display device, different information can be displayed on different focal planes, thereby better integrating the displayed content with the external environment, improving the fusion effect between virtual images and the external real world, and facilitating the achievement of better augmented reality display effects.

[0012] The display device with the above structure utilizes stereoscopic display function to achieve multi-focal plane display. Compared with related technologies that generate multiple optical imaging focal planes by adjusting optical elements (such as zoom lenses), it has advantages such as less modification to the display device, simple structure, low cost, small size, and wide adjustable range of display focal planes.

[0013] In some embodiments, the image source device includes an image generating device and a second projection lens. The image generating device is used to generate imaging light and project the imaging light onto the second projection lens. The imaging light includes a first imaging light and a second imaging light generated by the image generating device at different time periods. The first imaging light and the second imaging light are used to generate a left-eye image and a right-eye image for stereoscopic display, respectively.

[0014] The second projection lens is used to project the first imaging light and the second imaging light onto the conjugate surface. Both the first imaging light and the second imaging light are partially projected onto the first region and partially projected onto the second region.

[0015] The display device also includes a controllable light valve disposed between the image source device and the first projection lens. The controllable light valve has a controllable first state and a second state. The controllable light valve in the first state is used to block the imaging light passing through the second area, and the controllable light valve in the second state is used to block the imaging light passing through the first area.

[0016] In the display device provided in this application embodiment, the image source device uses time-division multiplexing to generate a first imaging light and a second imaging light at different time periods, and projects the first imaging light and the second imaging light onto a conjugate surface located on the light-inlet side of the first projection lens. A controllable light valve, by switching its operating state, can separately block the first imaging light and the second imaging light projected onto the first and second regions of the conjugate surface. The first projection lens is used to project the first imaging light and the second imaging light passing through the conjugate surface onto the eye box surface. By controlling the operating state (first state and second state) of the controllable light valve and the time correspondence between the first imaging light and the second imaging light generated by the image source device, the first imaging light and the second imaging light can be projected onto the left and right eye box regions of the eye box surface, respectively, thereby achieving a stereoscopic display effect.

[0017] This design offers several advantages. First, it is compatible with different types of image generation devices, such as projector engines and flat panel displays, making it suitable for various application scenarios while maintaining good display quality. Second, it boasts advantages such as simple structure, reduced manufacturing difficulty, and high reliability.

[0018] In addition, display devices with the above structure utilize stereoscopic display functionality to achieve multi-focal surface display, which has advantages over related technologies, such as requiring less modification to the display device, simple structure, low cost, small footprint, and a wide range of adjustable display focal surfaces.

[0019] In some embodiments, the display device includes two image source devices, namely a first image source device and a second image source device; both the first image source device and the second image source device include an image generating device and a second projection lens.

[0020] In the first image source device, the image generating device is used to generate a first imaging light projected onto a second projection lens, and the second projection lens is used to project the first imaging light onto a first region of a conjugate surface; in the second image source device, the image generating device is used to generate a second imaging light projected onto a second projection lens, and the second projection lens is used to project the second imaging light onto a second region of the conjugate surface. The first and second imaging lights are used to generate the left-eye and right-eye images, respectively, to achieve stereoscopic display.

[0021] In the display device provided in this embodiment, a first image source device and a second image source device simultaneously generate a first imaging light and a second imaging light, respectively, and project the first imaging light and the second imaging light onto a first region and a second region of a conjugate surface, respectively. The first imaging light, after passing through the first region, illuminates a first projection lens, which projects the first imaging light onto the left eye box region of the eye box surface. The second imaging light, after passing through the second region, illuminates the first projection lens, which projects the second imaging light onto the right eye box region of the eye box surface, thereby achieving a stereoscopic display effect. With this design, in scenarios where the display device achieves the same display refresh rate / frame rate, the switching rate between the first and second image source devices can be only half that of a time-division multiplexing scheme. In other words, compared to a time-division multiplexing scheme, the display device in this embodiment can reduce the requirements for the switching rate between the first and second image source devices. When the switching rate of the image source devices is the same, the display device in this embodiment can achieve a higher display refresh rate / frame rate compared to a time-division multiplexing scheme, which is beneficial for improving the display effect.

[0022] In some embodiments, both the first image source device and the second image source device further include a first reflective element; in the first image source device, the first reflective element reflects the first imaging light emitted from the second projection lens to a first region of the conjugate surface; in the second image source device, the first reflective element reflects the second imaging light emitted from the second projection lens to a second region of the conjugate surface. This design facilitates the layout of the first and second image source devices, thereby reducing the space occupied by the display device.

[0023] In some embodiments, the display device further includes a controllable light valve disposed between the image source device and the first projection lens. The controllable light valve has a controllable first state and a second state. The controllable light valve in the first state is used to block imaging light passing through the second region, and the controllable light valve in the second state is used to block imaging light passing through the first region. This design allows for selective blocking of imaging light in the first and second regions via the controllable light valve, thereby reducing crosstalk between the first and second imaging lights and improving the display quality of the display device.

[0024] In some embodiments, the controllable light valve includes a first light valve and a second light valve respectively disposed in the first region and the second region of the conjugate surface, and both the first light valve and the second light valve have controllable open and closed states.

[0025] When the first light valve is open, light illuminating the first area is allowed to pass through; when the first light valve is closed, light illuminating the first area is blocked from passing through; when the second light valve is open, light illuminating the second area is allowed to pass through; when the second light valve is closed, light illuminating the second area is blocked from passing through.

[0026] In the display device provided in the embodiments of this application, the controllable light valve includes a first light valve and a second light valve respectively disposed in the first region and the second region of the conjugate surface. By controlling the first light valve and the second light valve respectively, the controllable light valve can be switched between the first state and the second state. This design has the advantages of simple structure, easy control, and good imaging light blocking effect in the first region and the second region.

[0027] In some embodiments, both the first light valve and the second light valve are shutter devices or liquid crystal devices. It can be seen that the first and second light valves of the controllable light valve can be implemented using more than one type of device, with fewer selection limitations, which is beneficial for adapting to different scenarios and reducing costs.

[0028] In some embodiments, the first light valve and the second light valve are different areas of the same liquid crystal device. This design helps to improve the integration of the controllable light valve and reduces the control complexity of the controllable light valve.

[0029] In some embodiments, the controllable light valve includes a light valve structure and a driving device. The light valve structure includes a light-transmitting part and a light-blocking part. The light-transmitting part allows imaging light to pass through, while the light-blocking part blocks imaging light from passing through.

[0030] The driving device drives the optical valve structure to move. The controllable optical valve has a first state and a second state during the movement of the optical valve structure. When the controllable optical valve is in the first state, the light-transmitting part of the optical valve structure is located in the first region and the light-blocking part is located in the second region. When the controllable optical valve is in the second state, the light-transmitting part of the optical valve structure is located in the second region and the light-blocking part is located in the first region.

[0031] In the display device provided in this application embodiment, the controllable light valve can switch between a first state and a second state by driving the light valve structure to move through a driving device. This design has advantages such as simple structure, easy control, and good light blocking effect in the first and second regions. On the other hand, it is conducive to expanding the selection range of controllable light valves, thereby helping to adapt to different scenarios and reduce costs.

[0032] In some embodiments, when the first imaging light and the second imaging light are linearly polarized lights, the light-transmitting part is a polarizer with a transmission direction parallel to the polarization direction of the first imaging light and the second imaging light, and the light-shielding part is a polarizer with a transmission direction perpendicular to the light-transmitting part. This design is advantageous for adapting to scenarios where the first imaging light and the second imaging light are linearly polarized lights.

[0033] In some embodiments, the image generating apparatus is a projection optical engine, and the image source apparatus further includes a display medium located on the light-inlet side of the second projection lens. The display medium is used to image and display the imaging light generated by the projection optical engine and to diffuse the imaging light at an angle. By providing a display medium, it is beneficial to improve the imaging quality of the display device.

[0034] In some embodiments, the display medium is a diffuser screen or a waveguide pupil expander. This demonstrates that the display medium can be implemented using more than one type of device, reducing selection limitations and facilitating adaptation to different scenarios while lowering costs. Furthermore, in embodiments where the display medium is a waveguide pupil expander, various functions can be achieved, thereby simplifying the structure of the display device.

[0035] In some embodiments, the image generating device is a flat panel display screen, with the display surface of the flat panel display screen located on the light-incoming side of the second projection lens. This design allows the display device to be compatible with different types of image generating devices, offering advantages such as wide application range and good scalability. Furthermore, the display device's own imaging display function can be utilized, eliminating the need for a display medium and thus simplifying the display device's structure.

[0036] In some embodiments, the image source device includes an image generating device and a waveguide pupil expander. The image generating device generates imaging light that is projected onto the waveguide pupil expander. The waveguide pupil expander performs imaging display and angular diffusion on the imaging light and projects the imaging light onto a conjugate surface. By providing the waveguide pupil expander, the imaging light generated by the image generating device can be imaged and displayed, and the imaging light can be angularly diffused, which is beneficial to improving the imaging quality of the display device. Furthermore, compared to the above embodiments, the second projection lens can be omitted, thereby simplifying the structure of the display device.

[0037] Secondly, embodiments of this application also provide a means of transportation that includes a display device according to any one of the embodiments of the first aspect, the display device being installed on the means of transportation.

[0038] In some embodiments, the vehicle further includes a second reflective element, the display device being used to project imaging light onto the second reflective element, and the second reflective element being used to reflect the imaging light.

[0039] In some embodiments, the display device is a head-up display installed on a vehicle, and the second reflective element is a windshield.

[0040] The technical effects that the vehicle provided in this application embodiment can achieve are the same as those that the display device in any of the above embodiments can achieve, and will not be repeated here. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0042] Figure 2 for Figure 1 A schematic diagram of the structure when the image generation device is a projection optical engine;

[0043] Figure 3 for Figure 1 A schematic diagram of the optical path between the eye box surface and the conjugate surface of the display device;

[0044] Figure 4 for Figure 1 A schematic diagram of the controllable light valve in its first state;

[0045] Figure 5 for Figure 1 A schematic diagram of the controllable light valve in the second state;

[0046] Figure 6 This is a schematic diagram of the structure of a controllable light valve provided in an embodiment of this application;

[0047] Figure 7 This is a schematic diagram of the structure of another controllable light valve provided in an embodiment of this application;

[0048] Figure 8 A schematic diagram of the structure of a controllable light valve provided in another embodiment of this application;

[0049] Figure 9 for Figure 1 Timing diagram of the operation of the controllable light valve and image source device;

[0050] Figure 10 This is a schematic diagram of the structure of another display device provided in an embodiment of this application;

[0051] Figure 11 This is a schematic diagram of the structure of another display device provided in an embodiment of this application;

[0052] Figure 12 for Figure 11 A schematic diagram of the structure of the first image source device and the second image source device;

[0053] Figures 13A to 13DA schematic diagram illustrating a display device application scenario provided in an embodiment of this application;

[0054] Figure 14 A circuit diagram of a display device provided in an embodiment of this application;

[0055] Figure 15 A schematic diagram of the structure of a means of transportation provided for an embodiment of this application;

[0056] Figure 16 This is a functional diagram of a means of transportation provided for an embodiment of this application. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0058] In the following embodiments of this application, the terms "first," "second," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] In the embodiments of this application, "upper", "lower", "left" and "right" are not limited to the orientation of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0060] In the embodiments of this application, unless the context otherwise requires, the term "comprising" is interpreted as open and encompassing throughout the specification and claims, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "exemplarily," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this application. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0061] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0062] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0063] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on another layer or substrate, or that there is an intermediate layer between the layer or element and another layer or substrate.

[0064] Exemplary embodiments are described in this application with reference to cross-sectional views and / or plan views and / or equivalent circuit diagrams, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0065] This application provides a display device, such as... Figure 1 As shown, the display device 1 includes an image source device 2, a first projection lens 7, and a controllable light valve 3; wherein, the image source device 2 may include an image generation unit (PGU) 11, a diffusion screen 10, and a second projection lens 9. In some scenarios, the image generation unit 11 may be a projection optical engine, such as... Figure 2As shown, the image generating device 11 includes a light source 101, a light modulator 102, and a third projection lens 103. The light source 101 is used to generate a light beam P that is projected onto the light modulator 102. The light modulator 102 can be a liquid crystal on silicon (LCoS), a digital micromirror display (DMD), or a liquid crystal display (LCD), etc., and is used to modulate the light beam P to form an imaging light P0 containing image information. The imaging light P0 is projected out by the third projection lens 103.

[0066] In other scenarios, the image generating device 11 can also be a flat panel display, such as a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, a mini LED display, or a micro LED display.

[0067] The display device 1 provided in this application embodiment does not limit the specific type of the image generating device 11.

[0068] Please continue to refer to this. Figure 1 In the image source device 2 provided in this application embodiment, the image generation device 11 is used to form an imaging light containing image information based on image data. Here, the image data can be image data for stereoscopic display based on the principle of binocular parallax, including left-eye image data and right-eye image data for forming the left-eye image and the right-eye image, respectively. Correspondingly, the imaging light includes a first imaging light P1 and a second imaging light P2. The first imaging light P1 is formed based on the left-eye image data and can form a left-eye image for stereoscopic display based on the principle of binocular parallax; the second imaging light P2 is formed based on the right-eye image data and can form a right-eye image for stereoscopic display based on the principle of binocular parallax.

[0069] Please also refer to Figure 3In the display device 1 provided in this embodiment, a first imaging light P1 is projected onto the left eye box region 42 in the eye box surface 4, and a second imaging light P2 is projected onto the right eye box region 41 in the eye box surface 4. Here, the eye box refers to a cone-shaped region between the display device 1 and the eyes of an observer (e.g., a driver), including a left eye box 6 and a right eye box 5 corresponding to the left and right eyes, respectively. When the observer's eyes are located within this eye box region, and the left and right eyes are aligned with the left eye box 6 and right eye box 5, respectively, the observer can clearly see the content displayed by the display device 1. When the observer's eyes extend beyond this eye box region, and the left and right eyes are no longer aligned with the left eye box 6 and right eye box 5, the content displayed by the observer on the display device 1 appears blurry and distorted, or the observer may not even see the content displayed by the display device 1. The eye box surface 4 refers to a plane within the eye box that is parallel to both the width and height directions of the eye box, and includes the left eye box region 42 and the right eye box region 41 corresponding to the left and right eyes, respectively.

[0070] Therefore, when the first imaging light P1 is projected onto the left eye box region 42 in the eye box surface 4, and the second imaging light P2 is projected onto the right eye box region 41 in the eye box surface 4, for an observer located at the position of the pair of eye boxes, the left eye can receive the first imaging light P1, thereby being able to observe the left eye image formed by the first imaging light P1, which is a virtual image formed by the backward extension line of the first imaging light P1 in the left eye box region 42; the right eye can receive the second imaging light P2, thereby being able to observe the right eye image formed by the second imaging light P2, which is a virtual image formed by the backward extension line of the second imaging light P2 in the right eye box region 41.

[0071] In this embodiment, the image generation device 11 forms the first imaging light P1 and the second imaging light P2 by time-division multiplexing. That is, the first imaging light P1 and the second imaging light P2 are formed in adjacent different time periods. When the first imaging light P1 and the second imaging light P2 are formed in a sufficiently short time, the left eye image and the right eye image can be formed by rapid switching. Thus, the effect of stereoscopic display is achieved by utilizing the visual persistence effect of the human eye.

[0072] The imaging light generated by the image generating device 11 (including the first imaging light P1 and the second imaging light P2 generated at different times) can be unpolarized light, i.e., natural light, or it can be polarized light. The polarization state of the imaging light is related to the image generating device 11. For example, when the image generating device 11 is a silicon-based liquid crystal, a liquid crystal display device, or a liquid crystal display screen, the imaging light is usually linearly polarized light, and in some cases it can also be circularly polarized light or elliptically polarized light. As another example, when the image generating device 11 is a digital micromirror device, the imaging light is usually unpolarized light.

[0073] Please continue to refer to this. Figure 1In the image source device 2 provided in this application embodiment, a diffuser screen 10 is disposed on the light-emitting side of the image generating device 11. The image generating device 11 projects a first imaging light P1 and a second imaging light P2 formed at different time periods onto the diffuser screen 10. The diffuser screen 10 is used to receive the first imaging light P1 and the second imaging light P2 and perform imaging display; the diffuser screen 10 is the display medium of the image source device 2.

[0074] In the process of imaging and displaying the first imaging light P1 and the second imaging light P2, the diffuser screen 10 is also used to adjust the optical expansion of the first imaging light P1 and the second imaging light P2 and correct the deflection angle, so as to match the design requirements of the optical system in the display device 1 (such as the size of the eye box). With this design, on the one hand, by using the diffuser screen 10 to diffuse the angle of the first imaging light P1 and the second imaging light P2, a stereoscopic display viewpoint matching the interpupillary distance of the human eye can be formed, and it is also beneficial to increase the viewing angle of the stereoscopic display. On the other hand, the diffuser screen 10 can improve the uniformity of the image, thereby improving the imaging quality of the first imaging light P1 and the second imaging light P2.

[0075] Depending on their working principles, diffuser screens 10 can be classified into reflective diffuser screens and transmissive diffuser screens; depending on their working characteristics, diffuser screens 10 can be classified into scattering diffuser screens, diffraction diffuser screens, or holographic diffuser screens, etc. The display device 1 provided in this application embodiment does not limit the specific type of diffuser screen 10, and the specific parameters of diffuser screen 10 can also be determined according to the actual scenario.

[0076] Furthermore, in the image source device 2 provided in this application embodiment, the decision on whether to provide a diffusion screen 10 can be made based on the specific circumstances of the image generating device 11 in the image source device 2. For example, when the image generating device 11 is a projection optical engine, and the first imaging light P1 and the second imaging light P2 generated by the projection optical engine meet the optical system design requirements in terms of parameters such as optical extension; or, for example, when the image generating device 11 is a flat panel display screen, and the first imaging light P1 and the second imaging light P2 generated by the flat panel display screen meet the optical system design requirements in terms of parameters such as optical extension; the first imaging light P1 and the second imaging light P2 do not require further adjustment by the diffusion screen 10, therefore the diffusion screen 10 can be omitted.

[0077] like Figure 1 and Figure 3 As shown, in this embodiment, the first imaging light P1 and the second imaging light P2 continue to propagate after being imaged and displayed on the diffuser screen 10, which is disposed on the light-inlet side of the second projection lens 9. For example, the diffuser screen 10 can be disposed at one focal length (i.e., the focal plane) of the second projection lens 9, or at a position close to one focal length (i.e., the focal plane) of the second projection lens 9.

[0078] The second projection lens 9 is used to receive the first imaging light P1 and the second imaging light P2 emitted from the diffuser screen 10, and to converge the first imaging light P1 and the second imaging light P2 and project them onto the conjugate surface 8. After passing through the conjugate surface 8, the first imaging light P1 and the second imaging light P2 continue to be projected onto the first projection lens 7, and the first projection lens 7 projects the first imaging light P1 and the second imaging light P2 after passing through the conjugate surface 8 onto the eye box surface 4.

[0079] The eyepiece surface 4 and the conjugate surface 8 are conjugate with respect to the first projection lens 7, and there is a one-to-one correspondence between the light rays in the eyepiece surface 4 and the light rays in the conjugate surface 8. From another perspective, when the eyepiece surface 4 is an object, the conjugate surface 8 is the image formed by the first projection lens 7 on the eyepiece surface 4 (object); the eyepiece surface 4 and the conjugate surface 8 are in a conjugate relationship with respect to the object and image of the first projection lens 7.

[0080] Based on the conjugate relationship between the eye box surface 4 and the conjugate surface 8, it can be seen that the conjugate surface 8 includes regions corresponding to the left eye box region 42 and the right eye box region 41 in the eye box surface 4, respectively. In this paper, the conjugate surface 8 is divided into a first region 81 and a second region 82. The first region 81 is conjugately corresponding to the left eye box region 42, and the second region 82 is conjugately corresponding to the right eye box region 41.

[0081] It should be noted that for the image source device 2 that omits the diffuser screen 10, the positional relationship between the image generating device 11 and the second projection lens 9 can be set with reference to the diffuser screen 10, so that the first imaging light P1 and the second imaging light P2 can be converged and projected onto the conjugate surface 8 through the second projection lens 9. For example, in an embodiment where the image generating device 11 is a flat panel display screen and the diffuser screen 10 is omitted, the display surface of the flat panel display screen can be set at the position of the diffuser screen 10 in the above embodiment.

[0082] Please continue to refer to this. Figure 1 and Figure 3When the second projection lens 9 converges the first imaging light P1 and the second imaging light P2 emitted from the image source device 2 and projects them onto the conjugate surface 8, the first imaging light P1 and the second imaging light P2 are distributed in both the first region 81 and the second region 82 of the conjugate surface 8. However, the incident angles of the first imaging light P1 and the second imaging light P2 relative to the conjugate surface 8 are different in the first region 81 and the second region 82 of the conjugate surface 8. The portion of the first imaging light P1 and the second imaging light P2 projected onto the first region 81 will illuminate the first projection lens 7 after passing through the conjugate surface 8. The first projection lens 7 projects this portion of the imaging light onto the left eye box region 42; therefore, this portion of the imaging light can be received by the left eye of the observer in the eye box position. The portion of the first imaging light P1 and the second imaging light P2 projected onto the second region 82 will illuminate the first projection lens 7 after passing through the conjugate surface 8. The first projection lens 7 projects this portion of the imaging light onto the right eye box region 41; therefore, this portion of the imaging light can be received by the right eye of the observer in the eye box position.

[0083] like Figure 1 , Figure 4 and Figure 5 As shown, the display device 1 provided in this embodiment further includes a controllable light valve 3. The controllable light valve 3 is disposed between the first projection lens 7 and the image source device 2, and is located at the position of the conjugate surface 8. The controllable light valve 3 has a controllable first state and a controllable second state; as shown... Figure 4 As shown, when the controllable light valve 3 is in the first state, it can block the first imaging light P1 and the second imaging light P2 that illuminate the second region 82 in the conjugate surface 8, thereby allowing only the portions of the first imaging light P1 and the second imaging light P2 that illuminate the first region 81 in the conjugate surface 8 to pass through. Figure 5 As shown, when the controllable light valve 3 is in the second state, it can block the first imaging light P1 and the second imaging light P2 that illuminate the first region 81 in the conjugate surface 8, so that only the portion of the first imaging light P1 and the second imaging light P2 that illuminates the second region 82 in the conjugate surface 8 is allowed to pass through.

[0084] In this embodiment, as Figure 6As shown, the controllable light valve 3 includes a first light valve 31 and a second light valve 32 respectively disposed in the first region 81 and the second region 82 of the conjugate surface 8. The first light valve 31 and the second light valve 32 can be controlled independently and each has a controllable open state and a closed state. When the first light valve 31 is in the open state, it allows light illuminating the first region 81 of the conjugate surface 8 to pass normally; when the first light valve 31 is in the closed state, it blocks the light illuminating the first region 81 of the conjugate surface 8, preventing that part of the light from passing through. When the second light valve 32 is in the open state, it allows light illuminating the second region 82 of the conjugate surface 8 to pass normally; when the second light valve 32 is in the closed state, it blocks the light illuminating the second region 82 of the conjugate surface 8, preventing that part of the light from passing through.

[0085] It can be seen that by controlling the first light valve 31 to be in the open state and the second light valve 32 to be in the closed state, the controllable light valve 3 can be in the first state; by controlling the first light valve 31 to be in the closed state and the second light valve 32 to be in the open state, the controllable light valve 3 can be in the second state.

[0086] The first light valve 31 and the second light valve 32 can be light valve devices with controllable open and closed states, such as shutter devices and liquid crystal devices. When the first light valve 31 and the second light valve 32 are shutter devices, their open and closed states can be controlled by controlling the opening and closing of the shutter device. When the first light valve 31 and the second light valve 32 are liquid crystal devices, the arrangement of liquid crystal molecules in the liquid crystal device is changed by applying a voltage, thereby allowing light to pass through or blocking light; therefore, the open and closed states of the first light valve 31 and the second light valve 32 can be controlled.

[0087] like Figure 6 As shown, the first optical valve 31 and the second optical valve 32 can be integrated into a single structure; however, the controllable optical valve 3 provided in this application embodiment is not limited to this. For example, the first optical valve 31 and the second optical valve 32 in the controllable optical valve 3 can be two separate independent structures.

[0088] Furthermore, the first light valve 31 and the second light valve 32 in the controllable light valve 3 can also be different regions within the same liquid crystal device. Specifically, the controllable light valve 3 employs a liquid crystal device, which is divided into a first liquid crystal region and a second liquid crystal region corresponding to the first region 81 and the second region 82 in the conjugate surface 8. By applying voltage to the first liquid crystal region and the second liquid crystal region separately, the arrangement of liquid crystal molecules in the first liquid crystal region and the second liquid crystal region is controlled, thereby controlling the first liquid crystal region and the second liquid crystal region to exhibit states that allow light to pass through, as well as states that block or obstruct light passage; thus, the open and closed states of the first light valve 31 and the second light valve 32 can be controlled.

[0089] In some embodiments, the controllable light valve 3 includes a light valve structure and a driving device. The driving device drives the light valve structure to move, and the movement can be rotation or translation. Driven by the driving device, the light valve structure has two working states: one that blocks light rays illuminating the second region 82 of the conjugate surface 8, allowing only light rays illuminating the first region 81 of the conjugate surface 8 to pass through; and another that blocks light rays illuminating the first region 81 of the conjugate surface 8, allowing only light rays illuminating the second region 82 of the conjugate surface 8 to pass through. In other words, by controlling the driving device to drive the movement of the light valve structure, the controllable light valve 3 can have both a first state and a second state.

[0090] The light valve structure can be an overall light-blocking structure, or a structure including a light-blocking part and a light-transmitting part; wherein, the light-blocking part can block light and prevent it from passing through, while the light-transmitting part can allow light to pass through. The structure of the light valve structure and the way the driving device drives the movement of the light valve structure are related.

[0091] For example, such as Figure 7 As shown, the light valve structure 33 is a circular plate-shaped structure with a first straight line L1 as its central axis. The first straight line L1 is perpendicular to the conjugate surface 8 and is located in the middle between the first region 81 and the second region 82 in the conjugate surface 8. The light valve structure 33 includes a plurality of light-shielding parts 332 arranged around the first straight line L1, and a light-transmitting part 331 is also provided between two adjacent light-shielding parts 332; that is, the light-shielding parts 332 and the light-transmitting parts 331 are arranged alternately around the first straight line L1. When the light-transmitting part 331 in the light valve structure 33 is in the first region 81 of the conjugate surface 8, the light-shielding part 332 adjacent to the light-transmitting part 331 is in the second region 82 of the conjugate surface 8; at this time, the controllable light valve 3 is in the first state. When the light-shielding part 332 in the light valve structure 33 is in the first region 81 of the conjugate surface 8, the light-transmitting part 331 adjacent to the light-shielding part 332 is in the second region 82 of the conjugate surface 8; at this time, the controllable light valve 3 is in the second state.

[0092] The driving device is a rotary driving device that can drive the light valve structure 33 to rotate around the first straight line L1. During the rotation of the light valve structure 33 around the first straight line L1 under the drive of the driving device, the controllable light valve 3 can switch between the first state and the second state.

[0093] In the scheme where the light valve structure 33 is driven to rotate around the first straight line L1 by a driving device, the light valve structure 33 can also be a ring-shaped structure, a fan-shaped structure, or a semi-circular structure with the first straight line L1 as the central axis. The light valve structure 33 can also have only one light-shielding part 332.

[0094] Another example, such as Figure 8 As shown, the light valve structure 33 is a plate-like structure parallel to the conjugate surface 8. This plate-like structure includes a light-shielding part 332 and two light-transmitting parts 331 arranged along the second straight line L2 on both sides of the light-shielding part 332. Multiple light-shielding parts 332 can also be arranged along the second straight line L2, meaning that the light-shielding parts 332 and the light-transmitting parts 331 are arranged alternately along the second straight line L2. The second straight line L2 is parallel to the conjugate surface 8 and extends partly to the region directly opposite the first region 81 in the conjugate surface 8, and partly to the region directly opposite the second region 82 in the conjugate surface 8. When the light-transmitting part 331 in the light valve structure 33 is located in the first region 81 of the conjugate surface 8, the light-shielding part 332 adjacent to the light-transmitting part 331 is located in the second region 82 of the conjugate surface 8; at this time, the controllable light valve 3 is in the first state. When the light-shielding part 332 in the light valve structure 33 is in the first region 81 of the conjugate surface 8, the light-transmitting part 331 adjacent to the light-shielding part 332 is in the second region 82 of the conjugate surface 8; at this time, the controllable light valve 3 is in the second state.

[0095] The driving device is a linear driving device that can drive the light valve structure 33 to move along the second straight line L2. During the movement of the light valve structure 33 along the second straight line L2 under the drive of the driving device, the controllable light valve 3 can switch between the first state and the second state.

[0096] In the above embodiments, the light-shielding part 332 can be an opaque structure made of a light-shielding material. When the first imaging light P1 and the second imaging light P2 are linearly polarized light, the light-shielding part 332 can also be a polarizer whose transmission direction is perpendicular to the polarization direction of the first imaging light P1 and the second imaging light P2. The light-transmitting part 331 can be a light-transmitting structure made of a transparent material or an empty structure without material. When the first imaging light P1 and the second imaging light P2 are linearly polarized light, the light-transmitting part 331 can also be a polarizer whose transmission direction is parallel to the polarization direction of the first imaging light P1 and the second imaging light P2.

[0097] In the display device 1 provided in this embodiment, the image source device 2 uses time-division multiplexing to generate a first imaging light P1 and a second imaging light P2 at different time periods, and projects the first imaging light P1 and the second imaging light P2 onto the conjugate surface 8 located on the light-entry side of the first projection lens 7. The controllable light valve 3, through switching its operating state, can separately block the first imaging light P1 and the second imaging light P2 projected onto the first region 81 and the second region 82 of the conjugate surface 8. The first projection lens 7 is used to project the first imaging light P1 and the second imaging light P2 passing through the conjugate surface 8 onto the eye box surface 4. By controlling the operating state (first state and second state) of the controllable light valve 3 and the time correspondence between the generation of the first imaging light P1 and the second imaging light P2 by the image source device 2, the first imaging light P1 and the second imaging light P2 can be projected onto the left eye box region 42 and the right eye box region 41 of the eye box surface 4, respectively; thereby achieving a stereoscopic display effect.

[0098] To facilitate understanding of the working principle of the display device 1 provided in this embodiment, the process of realizing stereoscopic display by the display device 1 will be described by way of example below; please also refer to Figure 1 , Figures 3 to 5 as well as Figure 9 .

[0099] During the first time period T1, the image generating device 11 generates a first imaging light P1 based on the left eye image data, while simultaneously controlling the controllable light valve 3 to be in a first state. The image generating device 11 projects the generated first imaging light P1 onto the diffusion screen 10. After the first imaging light P1 is imaged and displayed on the diffusion screen 10, it continues to be projected onto the second projection lens 9. The second projection lens 9 converges the first imaging light P1 and projects it onto the conjugate surface 8. The first imaging light P1 is distributed in both the first region 81 and the second region 82 of the conjugate surface 8.

[0100] In its first state, the controllable light valve 3 blocks the portion of the first imaging light P1 that illuminates the second region 82 of the conjugate surface 8, while allowing the portion of the first imaging light P1 that illuminates the first region 81 of the conjugate surface 8 to pass through. The portion of the first imaging light P1 illuminating the first region 81 passes through the conjugate surface 8 and illuminates the first projection lens 7, which projects this portion of the first imaging light P1 onto the left eye box region 42 in the eye box surface 4. Because the portion of the first imaging light P1 illuminating the second region 82 of the conjugate surface 8 is blocked by the controllable light valve 3, it cannot pass through the first projection lens 7 to illuminate the right eye box region 41 in the eye box surface 4. For an observer in the eye box position, their left eye can receive the first imaging light P1, while their right eye cannot. Therefore, the observer's left eye can see the left-eye image formed by the first imaging light P1.

[0101] During the second time period T2, the image generating device 11 generates a second imaging light P2 based on the right eye image data, while simultaneously controlling the controllable light valve 3 to be in a second state. The image generating device 11 projects the generated second imaging light P2 onto the diffusion screen 10. After the first imaging light P1 is imaged and displayed on the diffusion screen 10, it continues to be projected onto the second projection lens 9. The second projection lens 9 converges the second imaging light P2 and projects it onto the conjugate surface 8. The second imaging light P2 is distributed in both the first region 81 and the second region 82 of the conjugate surface 8.

[0102] The controllable light valve 3, in its second state, can block the portion of the second imaging light P2 that illuminates the first region 81 of the conjugate surface 8, while allowing the portion of the second imaging light P2 that illuminates the second region 82 of the conjugate surface 8 to pass through. The portion of the second imaging light P2 that illuminates the second region 82 passes through the conjugate surface 8 and illuminates the first projection lens 7, which projects this portion of the second imaging light P2 into the right eye box region 41 of the eye box surface 4. Because the portion of the second imaging light P2 that illuminates the first region 81 of the conjugate surface 8 is blocked by the controllable light valve 3, it cannot pass through the first projection lens 7 to illuminate the left eye box region 42 of the eye box surface 4. For an observer in the eye box position, their right eye can receive the second imaging light P2, while their left eye cannot. Therefore, the observer's right eye can see the right eye image formed by the second imaging light P2.

[0103] During the above process, display device 1 can form a left-eye image that illuminates the left eye box region 42 in the eye box surface 4 during the first time period T1, and form a right-eye image that illuminates the right eye box region 41 in the eye box surface 4 during the second time period T2. If the first time period T1 and the second time period T2 are adjacent time periods and the total duration is short enough, due to the persistence of vision of the human eye, the left-eye image and the right-eye image displayed successively can produce a stereoscopic display effect.

[0104] As can be seen from the above description, the display device 1 provided in this embodiment utilizes the controllable light valve 3 to block the conjugate surface 8, controlling the first imaging light P1 and the second imaging light P2 to be projected onto the left eye box region 42 and the right eye box region 41 in the eye box surface 4, respectively, thereby achieving a stereoscopic display effect. Compared with stereoscopic display devices in related technologies that use barrier gratings, cylindrical lens arrays, etc. for beam splitting, this design, on the one hand, can improve the problem that moiré patterns are easily generated due to the periodic staggered distribution of barrier gratings and cylindrical lens arrays with the image generation device 11, thus affecting the display effect; thereby improving the display effect. On the other hand, it can not only match well with the imaging light generated by the flat panel display screen, but also match well with the imaging light generated by the projection optical engine, thereby improving the problem that stereoscopic display devices in related technologies that use barrier gratings and cylindrical lens arrays for beam splitting have requirements on the type of image generation device 11 and are relatively limited; it has better adaptability. It can be seen that the display device 1 provided in this embodiment can be compatible with different types of image generation devices 11 such as projection optical engines and flat panel displays, can be applied to different application scenarios, and all have good display effects.

[0105] In addition, compared with stereoscopic display devices that use barrier gratings, cylindrical lens arrays, etc. for light splitting in related technologies, the display device 1 provided in this embodiment has the advantages of simple structure, reduced manufacturing difficulty, and high reliability.

[0106] In some scenarios, display device 1 can arbitrarily change the perceived depth of the displayed content through stereoscopic display functionality, thereby forming a multi-focal display system with continuously adjustable focal plane position. When this multi-focal display system is applied to a head-up display device, different information can be displayed on different focal planes, thereby better integrating the displayed content with the external environment, improving the fusion effect between virtual images and the external real world, and facilitating the achievement of better augmented reality display effects.

[0107] The display device 1 with the above structure realizes multi-focal plane display by using stereoscopic display function. Compared with products in related technologies that generate multiple optical imaging focal planes by adjusting optical elements (such as zoom lenses), it has the advantages of requiring less modification to the display device 1, simple structure, low cost, small size, and wide adjustable range of display focal planes.

[0108] This application embodiment also provides a display device 1, such as... Figure 10As shown, the difference between this display device 1 and the display device 1 in the above embodiment is that the image source device 2 includes an image generating device 11 and a waveguide pupil expander 12. The image generating device 11 is used to form a first imaging light P1 and a second imaging light P2 projected onto the waveguide pupil expander 12. The waveguide pupil expander 12 can be a holographic waveguide, a coupling grating, etc., used as the display medium of the image source device 2. By setting the waveguide pupil expander 12, it is also possible to image and display the first imaging light P1 and the second imaging light P2, and to adjust the optical expansion amount and correct the skew angle. By diffusing the angle of the first imaging light P1 and the second imaging light P2, the design requirements of the optical system in the display device 1 (such as the size of the eye box) can be matched, enabling the first imaging light P1 and the second imaging light P2 to form a stereoscopic display viewing point matching the interpupillary distance of the human eye; and it is beneficial to increase the viewing angle of the stereoscopic display. The waveguide pupil expander 12 can also improve the uniformity of the image; thereby improving the imaging quality of the first imaging light P1 and the second imaging light P2. In addition, the waveguide pupil expander 12 can also replace the second projection lens 9 to achieve the function of the second projection lens 9, thereby simplifying the structure and reducing the volume occupied by the display device 1.

[0109] In some embodiments, the image source device 2 may include an image generating device 11, a waveguide pupil expander 12, and a second projection lens 9; that is, with Figure 1 The difference in the display device 1 is that a waveguide pupil expander 12 is used instead of a diffuser screen 10 as the display medium of the image source device 2. The waveguide pupil expander 12 can also realize the imaging display of the first imaging light P1 and the second imaging light P2, and adjust the optical expansion amount and correct the deflection angle.

[0110] This application also provides another display device 1, such as... Figure 11 As shown, the display device 1 includes a first projection lens 7 and two image source devices, namely a first image source device 21 and a second image source device 22. The first image source device 21 generates a first imaging light P1 and projects the first imaging light P1 onto a conjugate surface 8 located on the light-inlet side of the first projection lens 7. The second image source device 22 generates a second imaging light P2 and projects the second imaging light P2 onto the conjugate surface 8 located on the light-inlet side of the first projection lens 7. The first imaging light P1 and the second imaging light P2 continue to be projected onto the first projection lens 7 through the conjugate surface 8, and the first projection lens 7 projects the first imaging light P1 and the second imaging light P2 onto the eye box surface 4, respectively.

[0111] For information on eyebox surface 4 and conjugate surface 8, please refer to the description above; it will not be repeated here.

[0112] In the display device 1 provided in this embodiment, the first image source device 21 projects the first imaging light P1 onto the first region 81 of the conjugate surface 8, and the first projection lens 7 projects the first imaging light P1 onto the left eye box region 42 in the eye box surface 4. The second image source device 22 projects the second imaging light P2 onto the second region 82 of the conjugate surface 8, and the first projection lens 7 projects the second imaging light P2 onto the right eye box region 41 in the eye box surface 4.

[0113] like Figure 12 As shown, both the first image source device 21 and the second image source device 22 include an image generating device 11, a diffusion screen 10, and a second projection lens 9. For details regarding the first image source device 21 and the second image source device 22, please refer to the description of image source device 2 above; further details will not be repeated here.

[0114] In this embodiment, both the first image source device 21 and the second image source device 22 are disposed on the side of the conjugate surface 8 away from the first projection lens 7, and the imaging light emission directions of the first image source device 21 and the second image source device 22 are not aligned with the first region 81 and the second region 82 in the conjugate surface 8. Figure 11 and Figure 12 As shown, the imaging light emission directions of the first image source device 21 and the second image source device 22 are opposite and both are parallel to the conjugate surface 8. Based on this, both the first image source device 21 and the second image source device 22 are further provided with a first reflective element 13, which can be a mirror, a freeform mirror, etc. The first reflective element 13 in the first image source device 21 reflects the first imaging light P1 emitted from the second projection lens to the first region 81 of the conjugate surface 8, and the first reflective element 13 in the second image source device 22 reflects the second imaging light P2 emitted from the second projection lens to the second region 82 of the conjugate surface 8.

[0115] By setting the first reflective element 13 in the first image source device 21 and the second image source device 22, it is beneficial to the layout of the first image source device 21, the second image source device 22 and the first projection lens 7 in the display device 1, and it is beneficial to reduce the volume occupied by the display device 1.

[0116] When the first image source device 21 and the second image source device 22 form the first imaging light P1 and the second imaging light P2, which can be directly projected onto the first region 81 and the second region 82 of the conjugate surface 8, the first reflective element 13 can be omitted.

[0117] When the display device 1 provided in this embodiment is working, the first image source device 21 and the second image source device 22 simultaneously generate a first imaging light P1 and a second imaging light P2, respectively, and project the first imaging light P1 and the second imaging light P2 onto the first region 81 and the second region 82 of the conjugate surface 8, respectively; after passing through the first region 81, the first imaging light P1 illuminates the first projection lens 7, and the first projection lens 7 projects the first imaging light P1 onto the left eye box region 42 of the eye box surface 4; after passing through the second region 82, the second imaging light P2 illuminates the first projection lens 7, and the first projection lens 7 projects the second imaging light P2 onto the right eye box region 41 of the eye box surface 4; thereby achieving the effect of stereoscopic display.

[0118] Compared to stereoscopic display devices in related technologies that utilize barrier gratings, cylindrical lens arrays, etc., for beam splitting, the display device 1 provided in this embodiment achieves stereoscopic display by projecting a first imaging light P1 and a second imaging light P2 onto the first region 81 and the second region 82 of the conjugate surface 8, respectively. This design is compatible with different types of image generation devices 11, such as projection optical engines and flat panel displays, and can be applied to different application scenarios, all with good display effects. Furthermore, it has advantages such as simple structure, reduced manufacturing difficulty, and high reliability.

[0119] In some scenarios, display device 1 can arbitrarily change the perceived depth of the displayed content through stereoscopic display functionality, thereby forming a multi-focal display system with continuously adjustable focal plane position. When this multi-focal display system is applied to a head-up display device, different information can be displayed on different focal planes, thereby better integrating the displayed content with the external environment, improving the fusion effect between virtual images and the external real world, and facilitating the achievement of better augmented reality display effects.

[0120] The display device 1 with the above structure realizes multi-focal plane display by using stereoscopic display function. Compared with products in related technologies that generate multiple optical imaging focal planes by adjusting optical elements (such as zoom lenses), it has the advantages of requiring less modification to the display device 1, simple structure, low cost, small size, and wide adjustable range of display focal planes.

[0121] Furthermore, in scenarios where the display device 1 achieves the same display refresh rate / frame rate, the switching rate between the first image source device 21 and the second image source device 22 can be only half that of the time-division multiplexing scheme. In other words, compared to the time-division multiplexing scheme, the display device 1 in this embodiment can reduce the requirements on the switching rate of the first image source device 21 and the second image source device 22. With the same switching rate of the image source devices, the display device 1 in this embodiment can achieve a higher display refresh rate / frame rate compared to the time-division multiplexing scheme, which is beneficial for improving the display effect.

[0122] In some embodiments, the display device 1 employing two image source devices 2 may also be equipped with a controllable light valve 3. By controlling the controllable light valve 3 to switch between a first state and a second state, crosstalk between the first imaging light P1 and the second imaging light P2 is reduced, thereby improving the display effect.

[0123] In the above embodiments, the first projection lens 7, the second projection lens 9, and the third projection lens 103 may include one or more lenses; and may be either short-focus lenses or long-focus lenses.

[0124] The display device provided in this application embodiment can be applied to scenarios such as audio-visual entertainment and driver assistance.

[0125] For example, in one possible application scenario, the display device in this application embodiment can be a head-up display (HUD). Please refer to [link to relevant documentation]. Figure 13A . Figure 13A This explanation uses a head-up display (HUD) installed in a vehicle as an example. An HUD projects navigation information, instrument panel information, etc., into the driver's forward field of vision, preventing the driver from looking down to view this information and thus ensuring driving safety. The image projected by the HUD is reflected off the windshield, forming a virtual image outside the vehicle. Types of HUDs include, but are not limited to, windshield (W) HUDs and augmented reality (AR) HUDs.

[0126] In another possible implementation, the display device in this application embodiment can be an in-vehicle display screen; please refer to [link / reference]. Figure 13B The in-vehicle display screen can be installed on the back of the seat or in the front passenger seat of a vehicle, etc. This application does not limit the installation location of the in-vehicle display screen.

[0127] In another possible application scenario, the display device in this application embodiment can be a Near-Eye Display (NED) device. An NED device can be, for example, an AR device or a VR device. An AR device can include, but is not limited to, AR glasses or AR headsets, and a VR device can include, but is not limited to, VR glasses or VR headsets. Please refer to... Figure 13C For example, with AR glasses, users can wear AR glasses to play games, watch videos, participate in virtual meetings, or shop via video.

[0128] In another possible application scenario, the display device in this application embodiment can be a projector; please refer to [link to relevant documentation]. Figure 13D A projector can project images onto a wall or projection screen.

[0129] The application scenarios given above are merely examples. The display device provided in this application embodiment can also be applied to other possible scenarios, such as medical devices, displays integrated into smart home appliances, or network TVs, smart TVs, Internet Protocol TV (IPTV), or integrated therein. This application embodiment does not limit the application scenarios of the display device.

[0130] Please refer to Figure 14 , Figure 14 This is a schematic diagram of a display device 100 provided in an embodiment of this application.

[0131] like Figure 14 As shown, the circuitry in the display device 100 mainly includes a processor 1001, internal memory 1002, external memory interface 1003, audio module 1004, video module 1005, power supply module 1006, wireless communication module 1007, I / O interface 1008, video interface 1009, Controller Area Network (CAN) transceiver 1010, display circuit 1011, and any of the aforementioned image generation devices 11. The processor 1001 and its peripheral components, such as the internal memory 1002, CAN transceiver 1010, audio module 1004, video module 1005, power supply module 1006, wireless communication module 1007, I / O interface 1008, video interface 1009, transceiver 1010, and display circuit 1011, can be connected via a bus.

[0132] The processor 1001 can be referred to as a front-end processor. The processor 1001 includes one or more processing units, such as: an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). These different processing units can be independent devices or integrated into one or more processors.

[0133] The processor 1001 may also include a memory for storing instructions and data. For example, it may store the operating system of the display device 100, AR Creator software packages, etc. In some embodiments, the memory in the processor 1001 is a cache memory. This memory can store instructions or data that the processor 1001 has just used or that are used repeatedly. If the processor 1001 needs to use the instruction or data again, it can directly retrieve it from the memory. This avoids repeated accesses, reduces the waiting time of the processor 1001, and thus improves system efficiency.

[0134] Additionally, if the display device 100 in this embodiment is installed on a vehicle, the functions of the processor 1001 can be implemented by a domain controller on the vehicle.

[0135] In some embodiments, the display device 100 may further include multiple input / output (I / O) interfaces 1008 connected to the processor 1001. Interfaces 1008 may include, but are not limited to, inter-integrated circuit (I2C) interfaces, inter-integrated circuit sound (I2S) interfaces, pulse code modulation (PCM) interfaces, universal asynchronous receiver / transmitter (UART) interfaces, mobile industry processor interfaces (MIPI), general-purpose input / output (GPIO) interfaces, subscriber identity module (SIM) interfaces, and / or universal serial bus (USB) interfaces. The aforementioned I / O interfaces 1008 can connect to devices such as mice, touchscreens, keyboards, cameras, speakers, microphones, etc., and can also connect to physical buttons on the display device 100 (e.g., volume buttons, brightness adjustment buttons, power buttons, etc.).

[0136] Internal memory 1002 can be used to store computer executable program code, which includes instructions. Memory 1002 may include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function (such as call function, time setting function, AR function, etc.), etc. The data storage area may store data created during the use of the display device (such as a phone book, world time, etc.). Furthermore, internal memory 1002 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc. Processor 1001 executes various functional applications and data processing of the display device 100 by running instructions stored in internal memory 1002 and / or instructions stored in memory disposed in processor 1001.

[0137] The external memory interface 1003 can be used to connect external memory (such as a Micro SD card). The external memory can store data or program instructions as needed, and the processor 1001 can perform read and write operations on this data or program through the external memory interface 1003.

[0138] The audio module 1004 is used to convert digital audio information into analog audio signals for output, and also to convert analog audio input into digital audio signals. The audio module 1004 can also be used for encoding and decoding audio signals, such as for playback or recording. In some embodiments, the audio module 1004 may be located in the processor 1001, or some functional modules of the audio module 1004 may be located in the processor 1001. The display device can implement audio functions through the audio module 1004 and the application processor, etc.

[0139] The video interface 1009 can receive externally input audio and video, specifically including high-definition multimedia interface (HDMI), digital visual interface (DVI), video graphics array (VGA), display port (DP), low voltage differential signaling (LVDS), etc. The video interface 1009 can also output video. For example, the display device 100 can receive video data sent by a navigation system or a domain controller through the video interface.

[0140] The video module 1005 can decode the video input from the video interface 1009, such as performing H.264 decoding. The video module can also encode the video captured by the display device 100, such as performing H.264 encoding on video captured by an external camera. Furthermore, the processor 1001 can also decode the video input from the video interface 1009 and then output the decoded image signal to the display circuit 1011.

[0141] Furthermore, if the display device 100 in this embodiment is installed on a vehicle, the display device 100 also includes a CAN transceiver 1010, which can be connected to the vehicle's CAN bus. Through the CAN bus, the display device 100 can communicate with the in-vehicle entertainment system (music, radio, video modules), vehicle status system, etc. For example, a user can activate the in-vehicle music playback function by operating the display device 100. The vehicle status system can send vehicle status information (doors, seat belts, etc.) to the display device 100 for display.

[0142] The display circuit 1011 and the image generating device 11 together realize the function of displaying images. The display circuit 1011 receives the image signal output by the processor 1001, processes the image signal, and then inputs it into the image generating device 11 for imaging. The display circuit 1011 can also control the image displayed by the image generating device 11. For example, it can control parameters such as display brightness or contrast. The display circuit 1011 may include a driving circuit, an image control circuit, etc.

[0143] In this embodiment, the video interface 1009 can receive input video data (or video source), and the video module 1005 decodes and / or digitizes the data before outputting an image signal to the display circuit 1011. The display circuit 1011 drives the image generating device 11 to form an image based on the input image signal, thereby generating a visual image (emitting imaging light).

[0144] The power module 1006 is used to provide power to devices such as the processor 1001 and the image generation device 11 based on the input power (e.g., DC power). The power module 1006 may include a rechargeable battery. In addition, the power module 1006 can be connected to the vehicle's power supply module (e.g., a power battery), and the vehicle's power supply module can supply power to the power module 1006 of the display device 100.

[0145] The wireless communication module 1007 enables the display device 100 to communicate wirelessly with the outside world. It can provide solutions for wireless communication such as Wireless Local Area Networks (WLAN), Wireless Fidelity (Wi-Fi), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), and Infrared (IR). The wireless communication module 1007 can be one or more devices integrating at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signal, and sends the processed signal to the processor 1001. The wireless communication module 1007 can also receive signals to be transmitted from the processor 1001, modulate and amplify them, and then convert them into electromagnetic waves for radiation via the antenna.

[0146] In addition, the video data decoded by the video module 1005 can be input not only through the video interface 1009, but also wirelessly received through the wireless communication module 1007 or read from the internal memory 1002 or external memory. For example, the display device 100 can receive video data from the terminal device or the in-vehicle entertainment system through the vehicle's wireless local area network. The display device 100 can also read the audio and video data stored in the internal memory 1002 or external memory.

[0147] Furthermore, the circuit diagrams illustrated in the embodiments of this application do not constitute a specific limitation on the display device 100. In other embodiments of this application, the display device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0148] In addition to the functions described above, the display device 100 can also provide broadcast television reception functionality. For example, the display device 100 can be integrated into IPTV, smart TV, or Internet Protocol TV (IPTV).

[0149] This application also provides a vehicle equipped with the display device 100 described in the above embodiments. The vehicle further includes a reflective element for reflecting the imaging light generated by the display device 100 to a preset position.

[0150] For example, such as Figure 15As shown, when the display device 100 is a head-up display device installed on the vehicle 200, the second reflective element can be the windshield 201 of the vehicle 200. The windshield 201 is used to receive the imaging light emitted by the head-up display device, wherein the imaging light includes driving-related image information. The windshield 201 reflects the imaging light to the eyes of the driver of the vehicle 200 so that the driver of the vehicle 200 can see a virtual image of the driving-related image information.

[0151] Please see Figure 16 , Figure 16 This is a functional diagram of a vehicle 200 provided in an embodiment of this application. The vehicle may include various subsystems, such as the sensor system 210, control system 220, one or more peripheral devices 230 (one is shown as an example), power supply 240, computer system 250, and display system 260 shown in the diagram. These subsystems can communicate with each other. The display system 260 may include the display device 100 provided in an embodiment of this application. The vehicle may also include other functional systems, such as an engine system that provides power to the vehicle, a cockpit, etc., which are not limited herein.

[0152] The sensor system 210 may include several detection devices that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to a certain rule. These detection devices may include a Global Positioning System (GPS), a vehicle speed sensor, an Inertial Measurement Unit (IMU), a radar unit, a laser rangefinder, a camera device, a wheel speed sensor, a steering sensor, a gear sensor, or other components used for automatic detection, etc., and this application is not limited thereto.

[0153] The control system 220 may include several components, such as the steering unit, braking unit, lighting system, automatic driving system, map navigation system, network time synchronization system, and obstacle avoidance system shown in the figure. The control system 220 can receive information (such as vehicle speed, distance, etc.) sent by the sensor system 210 to realize functions such as automatic driving and map navigation.

[0154] Optionally, the control system 220 may also include components such as a throttle controller and an engine controller for controlling the vehicle's speed, which is not limited in this application.

[0155] Peripheral device 230 may include several components, such as a communication system, a touch screen, a user interface, a microphone, and a speaker. The communication system enables network communication between the vehicle and other devices. In practical applications, the communication system can employ wireless or wired communication technologies to achieve network communication between the vehicle and other devices. The wired communication technology can refer to communication between the vehicle and other devices via network cables or fiber optic cables.

[0156] Power source 240 represents a system that provides electricity or energy to a vehicle, which may include, but is not limited to, rechargeable lithium batteries or lead-acid batteries. In practical applications, one or more battery components in the power source are used to provide electrical energy or power for vehicle startup, and the type and materials of the power source are not limited in this application.

[0157] Several functions of the vehicle can be controlled and implemented by the computer system 250. The computer system 250 may include one or more processors 2501 (the figure shows one processor as an example) and a memory 2502 (also referred to as a storage device). In practical applications, the memory 2502 may be located inside the computer system 250 or outside the computer system 250, for example, as a cache in the vehicle, etc., which is not limited in this application.

[0158] The processor 2501 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2501 can be used to execute relevant programs or corresponding instructions stored in the memory 2502 to implement the corresponding functions of the vehicle. The processor 2501 may also be referred to as a domain controller.

[0159] The memory 2502 may include volatile memory, such as RAM; the memory may also include non-volatile memory, such as ROM, flash memory, HDD, or SSD; the memory 2502 may also include combinations of the above types of memory. The memory 2502 can be used to store a set of program code or instructions corresponding to the program code, so that the processor 2501 can call the program code or instructions stored in the memory 2502 to implement the corresponding functions of the vehicle. In this application, the memory 2502 may store a set of program code for vehicle control. The processor 2501 can call the program code to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in this application.

[0160] Optionally, in addition to storing program code or instructions, the memory 2502 may also store information such as road maps, driving routes, and sensor data. The computer system 250 can be combined with other components in the vehicle functional framework diagram, such as sensors and GPS in the sensor system, to realize the relevant functions of the vehicle. For example, the computer system 250 can control the driving direction or speed of the vehicle based on data input from the sensor system 210; this application does not impose limitations on this.

[0161] The display system 260 can interact with other systems within the vehicle. For example, it can display navigation information sent by the control system 220, or play multimedia content sent by the computer system 250 and peripheral devices 230. The specific structure of the display system 260 is described in the embodiments of the display devices described above, and will not be repeated here.

[0162] The four subsystems illustrated in this embodiment—sensor system 210, control system 220, computer system 250, and display system 260—are merely examples and do not constitute a limitation. In practical applications, vehicles can combine several components according to different functions to obtain subsystems with corresponding functions. In practical applications, vehicles may include more or fewer subsystems or components, and this application does not impose any limitations.

[0163] The vehicles used in this application can be known vehicles such as automobiles, airplanes, ships, and rockets, or they can be new vehicles that will emerge in the future. Automobiles can be electric vehicles, gasoline-powered vehicles, or hybrid vehicles, such as pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell vehicles, and new energy vehicles; this application does not specifically limit their use.

[0164] The technical effects that the display device and vehicle provided in this application embodiment can achieve are the same as those that the display device 1 described in any of the above embodiments can achieve, and will not be repeated here.

[0165] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display device, characterized in that, The display device includes an image source device and a first projection lens; The image source device is used to generate imaging light and project the imaging light onto a conjugate surface located on the light-inlet side of the first projection lens. The first projection lens is used to project the imaging light passing through the conjugate surface onto the eye box surface. The conjugate surface and the eye box surface are conjugate with respect to the first projection lens. The conjugate surface includes a first region and a second region. The eye box surface includes a left eye box region and a right eye box region. The imaging light passing through the first region is projected by the first projection lens onto the left eye box region, and the imaging light passing through the second region is projected by the first projection lens onto the right eye box region.

2. The display device according to claim 1, characterized in that, The image source device includes an image generating device and a second projection lens. The image generating device is used to generate the imaging light and project the imaging light onto the second projection lens. The imaging light includes a first imaging light and a second imaging light formed by the image generating device at different time periods. The first imaging light and the second imaging light are used to form the left eye image and the right eye image to realize stereoscopic display, respectively. The second projection lens is used to project the first imaging light and the second imaging light onto the conjugate surface, wherein both the first imaging light and the second imaging light are partially projected onto the first region and partially projected onto the second region; The display device further includes a controllable light valve disposed between the image source device and the first projection lens. The controllable light valve has a controllable first state and a second state. The controllable light valve in the first state is used to block the imaging light passing through the second region, and the controllable light valve in the second state is used to block the imaging light passing through the first region.

3. The display device according to claim 1, characterized in that, The display device includes two image source devices, namely a first image source device and a second image source device; both the first image source device and the second image source device include an image generating device and a second projection lens. In the first image source device, the image generating device is used to generate a first imaging light projected onto the second projection lens, and the second projection lens is used to project the first imaging light onto a first region of the conjugate surface; In the second image source device, the image generating device is used to generate a second imaging light projected onto the second projection lens, and the second projection lens is used to project the second imaging light onto a second region of the conjugate surface; The first imaging light and the second imaging light are used to form the left-eye image and the right-eye image for stereoscopic display, respectively.

4. The display device according to claim 3, characterized in that, Both the first image source device and the second image source device further include a first reflective element; In the first image source device, the first reflective element reflects the first imaging light emitted from the second projection lens to the first region of the conjugate surface; In the second image source device, the first reflective element reflects the second imaging light emitted from the second projection lens to the second region of the conjugate surface.

5. The display device according to claim 3 or 4, characterized in that, The display device further includes a controllable light valve disposed between the image source device and the first projection lens. The controllable light valve has a controllable first state and a second state. The controllable light valve in the first state is used to block the imaging light passing through the second region, and the controllable light valve in the second state is used to block the imaging light passing through the first region.

6. The display device according to claim 2 or 5, characterized in that, The controllable light valve includes a first light valve and a second light valve respectively provided in the first region and the second region of the conjugate surface. Both the first light valve and the second light valve have controllable open and closed states. When the first light valve is in the open state, light illuminating the first area is allowed to pass through; when the first light valve is in the closed state, light illuminating the first area is blocked from passing through. When the second light valve is in the open state, light illuminating the second area is allowed to pass through; when the second light valve is in the closed state, light illuminating the second area is blocked from passing through.

7. The display device according to claim 6, characterized in that, Both the first light valve and the second light valve are shutter devices or liquid crystal devices.

8. The display device according to claim 6, characterized in that, The first light valve and the second light valve are different areas of the same liquid crystal device.

9. The display device according to claim 2 or 5, characterized in that, The controllable light valve includes a light valve structure and a driving device. The light valve structure includes a light-transmitting part and a light-blocking part. The light-transmitting part allows the imaging light to pass through, and the light-blocking part blocks the imaging light from passing through. The driving device drives the optical valve structure to move, and the controllable optical valve has the first state and the second state during the movement of the optical valve structure. When the controllable light valve is in the first state, the light-transmitting part of the light valve structure is located in the first region, and the light-blocking part is located in the second region; When the controllable light valve is in the second state, the light-transmitting part of the light valve structure is located in the second region, and the light-blocking part is located in the first region.

10. The display device according to claim 9, characterized in that, When the first imaging light and the second imaging light are linearly polarized light, the light-transmitting part is a polarizer whose transmission direction is parallel to the polarization direction of the first imaging light and the second imaging light, and the light-shielding part is a polarizer whose transmission direction is perpendicular to the light-transmitting part.

11. The display device according to any one of claims 2 to 10, characterized in that, The image generating device is a projection optical engine, and the image source device further includes a display medium located on the light-inlet side of the second projection lens. The display medium is used to image and display the imaging light generated by the projection optical engine and to diffuse the imaging light at an angle.

12. The display device according to claim 11, characterized in that, The display medium is a diffuser screen or a waveguide pupil expander.

13. The display device according to any one of claims 2 to 10, characterized in that, The image generating device is a flat panel display screen, and the display surface of the flat panel display screen is located on the light-inlet side of the second projection lens.

14. The display device according to claim 1, characterized in that, The image source device includes an image generating device and a waveguide pupil expanding device. The image generating device is used to generate the imaging light projected onto the waveguide pupil expanding device. The waveguide pupil expanding device is used to perform imaging display and angular diffusion on the imaging light and project the imaging light onto the conjugate surface.

15. A means of transportation, characterized in that, The display device includes any one of claims 1 to 14, and the display device is installed on the vehicle.

16. The means of transport according to claim 15, characterized in that, The vehicle also includes a second reflective element, the display device being used to project imaging light onto the second reflective element, and the second reflective element being used to reflect the imaging light.

17. The means of transport according to claim 16, characterized in that, The display device is a head-up display installed on the vehicle, and the second reflective element is the windshield.

Images