Display device and vehicle

Abstract

The invention provides a display device which can be applied to the fields of automobiles, aviation, spaceflight, navigation and the like. The display device is compact in size, simple in light path structure and good in imaging quality. The display device comprises a projection module, a deflection module, a first reflection element and a second reflection element. Wherein the projection module generates image light and projects the image light to the deflection module, the deflection module projects the image light incident from different positions to the first reflection element at different target deflection angles, then the first reflection element reflects the image light to the second reflection element, and the image light is reflected by the second reflection element to enter human eyes.

Description

Technical Field

[0001] Embodiments of the present application relate to the fields of display technology and intelligent automobile driving technology, and more specifically, to a display device. Background Art

[0002] In order to improve driving safety, head up display (HUD), especially augmented reality head up display (AR-HUD), has become a hot research direction. AR-HUD can not only improve the driving safety risks caused by the driver lowering his head by projecting important information needed by the driver onto the front windshield of the car. At the same time, it can also integrate the displayed virtual image with the real scene around the car, so that the driver can see the virtual image integrated with the real scene, achieving the visual effect of augmented reality.

[0003] In order to avoid glare caused by sunlight backflow, it is usually necessary to make the direction of the imaging light emitted from the diffuser screen have a certain angle with respect to the normal direction of the diffuser screen. However, the imaging light incident on the diffuser screen also has an angle with the normal direction of the diffuser screen, and the sizes of the two angles are not the same, resulting in the mismatch between the directions of the imaging light incident on the diffuser screen and the imaging light exiting the diffuser screen, causing the loss of light energy. Currently, the solutions to compensate for the mismatch between the front and rear optical paths (where the front optical path refers to the optical path of the imaging light emitted from the diffuser screen, and the rear optical path refers to the optical path before the imaging light enters the diffuser screen) are mainly divided into two categories. One is to use lenses in the HUD, such as cylindrical lenses, to correct the angular difference between the front and rear image lights, such as Figure 2 As shown; the other type is to use a diffuser screen and a picture generation unit (PGU) arranged in an inclined manner, such as Figure 3 As shown. However, in solution one, since the cylindrical lens is large and usually thick, it will not only increase the volume of the HUD, but also affect the clarity of the displayed image. In addition, the cylindrical lens will increase the reflection surface, thereby increasing the probability of glare during imaging. In solution two, the tilted diffuser screen causes the imaging light to be emitted at an angle, resulting in poor uniformity of the virtual image generated by the imaging light and low brightness value.

[0004] Therefore, how to reduce the size of the HUD device and improve the display effect while avoiding glare caused by sunlight backflow is an urgent problem to be solved. Summary of the invention

[0005] The present application provides a display device and a vehicle. The display device provided by the present application has a compact size, a simple optical path structure, and good imaging quality.

[0006] In a first aspect, an embodiment of the present application provides a display device. The display device includes: a projection module, a deflection module, a first reflective element, and a second reflective element. The projection module is used to project image light onto the deflection module; the deflection module is used to project the image light incident at different positions onto the first reflective element at different target deflection angles; the first reflective element is used to reflect the image light emitted by the deflection module to the second reflective element; and the second reflective element is used to reflect the image light from the first reflective element to the human eye.

[0007] Based on the above solution, in the display device provided by the present application, the deflection module can emit image light incident at different positions at different target deflection angles, and achieve matching between the direction of the emitted image light and the direction of the incident image light by controlling the emitted image light. Compared with the solution of introducing a cylindrical lens in the light path, the deflection module can improve the utilization rate of light energy, thereby improving the imaging quality of the display device.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the deflection module is a first diffuser screen, the first surface of the first diffuser screen includes a first microstructure array, and the multiple first microstructures of the first microstructure array have different curvatures in a first direction. The first diffuser screen is specifically used to: project the image light incident at different positions along the first direction onto the first reflective element at different target deflection angles.

[0009] Based on the above scheme, in the display device provided by the present application, the deflection module is designed as a first diffusion screen, and the curvature of the first microstructure on the surface of the first diffusion screen is used to change the direction of the image light emission, that is, to achieve different deflection effects of microstructures with different curvatures on the image light, and then to achieve control of the emitted image light at different microstructures. It should be noted that in the display device provided by the present application, the first diffusion screen not only realizes the adjustment of the direction of the image light, but also has the function of a common diffusion screen, that is, to generate a relay image, serve as an amplified image source of the display device, expand the diffusion angle of the displayed image, and improve the field of view of the display device. Therefore, compared with the scheme of introducing a cylindrical lens or other element for adjusting the direction of the image light in the display light path, the functions of two devices can be realized simultaneously with only one device, so the volume of the device can be greatly reduced, while reducing energy loss, and reducing problems such as stray light caused by the cylindrical lens, thereby realizing a display device with better imaging quality and more compact volume.

[0010] In combination with the first aspect, in some implementations of the first aspect, the plurality of first microstructures of the first microstructure array have different curvatures in the second direction, and the first diffusion screen is further used to: change an emission direction of the image light in the second direction.

[0011] Based on the above solution, the first diffuser can change the direction of the emitted image light in the first direction and the second direction, so that the display device provided by the present application can be applied to more scenes. At the same time, since the first diffuser can change the emission direction of the image light in multiple directions, the position layout of other components in the display device can be made more flexible, thereby improving the flexibility of the display device design.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the thicknesses of the plurality of first microstructures of the first microstructure array in the third direction are different.

[0013] In combination with the first aspect, in certain implementations of the first aspect, thicknesses of any two adjacent first microstructures in the first microstructure array are different.

[0014] By designing the thicknesses of any adjacent first microstructures on the first surface of the first diffusion screen in the display device to be different, the diffraction effect caused by each first microstructure can be reduced, thereby achieving the purpose of improving the imaging quality of the display device.

[0015] In combination with the first aspect, in some implementations of the first aspect, two directions among the first direction, the second direction and the third direction are perpendicular to each other.

[0016] In combination with the first aspect, in some implementations of the first aspect, the first microstructure array is a first microlens array.

[0017] In combination with the first aspect, in some implementations of the first aspect, the surface shape of the plurality of first microlenses in the first microlens array includes at least one of a convex surface and a concave surface.

[0018] In the display device provided in the present application, when the first microstructure array of the first diffusion screen is a microlens array, the surface shape of each microlens array is a free-form surface. By designing the surface shape of the microlens array to be at least one of a convex surface or a concave surface, the diversity and flexibility of the display device design are increased.

[0019] In combination with the first aspect, in some implementations of the first aspect, the boundary shapes of the plurality of first microlenses are irregular.

[0020] The irregular boundary shape can reduce the aberration of the microlens during imaging, such as spherical aberration or distortion, thereby improving the imaging quality. At the same time, the irregular boundary shape of the microlens has lower requirements for processing accuracy, which can reduce the difficulty of processing and has lower requirements for processing accuracy.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the surface of each first microstructure in the first microstructure array presents a concave-convex texture.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the curvature of the first microstructure in the first microstructure array is determined by the incident angle of the image light incident on the first microstructure, the deflection angle of the image light emitted by the first microstructure, and the diffusion angle of the image light emitted by the first microstructure, and the first microstructure is any first microstructure in the first microstructure array.

[0023] By determining the curvature of each first microstructure through the incident angle of the incident light, the target deflection angle of the outgoing light, and the diffusion angle of the outgoing light, precise control of the image light can be achieved, and the utilization rate of light energy can be improved, thereby achieving the effect of improving the imaging brightness, and further achieving the purpose of improving the imaging performance of the display device.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the deflection module includes a first Fresnel lens and a second diffusion screen, wherein: the first surface of the first Fresnel lens includes a second microstructure array, and the curvatures of the multiple second microstructures of the second microstructure array in the first direction are different; the first Fresnel lens is specifically used to: project the image light incident at different positions along the first direction onto the second diffusion screen at different target deflection angles; the second diffusion screen generates a relay image using the image light emitted by the first Fresnel lens, and increases the diffusion angle of the image light emitted to the first reflective element.

[0025] By designing the deflection module of the display device as a combination of a Fresnel lens and a diffuser screen, and controlling the emission direction of the image light through microstructures of different curvatures on the surface of the Fresnel lens, the Fresnel lens has higher imaging accuracy and better imaging effect than optical elements such as cylindrical lenses, thereby achieving the effect of improving the performance of the display device.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the curvatures of the multiple second microstructures of the second microstructure array in the second direction are different, and the first Fresnel lens is further used to: project the image light incident at different positions along the second direction onto the second diffusion screen at different target deflection angles.

[0027] By designing the first Fresnel lens to change the outgoing deflection angle of the image light in two directions, the use scenarios of the display device can be expanded.

[0028] In combination with the first aspect, in certain implementations of the first aspect, each second microstructure in the second microstructure array is a protruding structure, each of the protruding structures has a different slope, and / or each of the protruding structures has a different protruding height.

[0029] In combination with the first aspect, in some implementations of the first aspect, the deflection module includes a second Fresnel lens and a third diffuser screen, wherein: the first surface of the second Fresnel lens includes a third microstructure array, and the curvatures of the multiple third microstructures of the third microstructure array in the first direction are different, and the second Fresnel lens is specifically used to: project the image light incident at different positions along the first direction onto the third diffuser screen at different target deflection angles; the first surface of the third diffuser screen includes a fourth microstructure array, and the curvatures of the multiple fourth microstructures of the fourth microstructure array in the second direction are different, and the third diffuser screen is specifically used to: project the image light incident at different positions along the second direction onto the first reflective element at different target deflection angles.

[0030] Based on the above scheme, in the display device provided in the present application, both the Fresnel lens and the diffuser screen can realize the deflection effect on light, so that the display device can allocate different deflection effects on the Fresnel lens and the diffuser screen according to the requirements of the application scenario, so that the display device provided in the present application can be suitable for more application scenarios.

[0031] In combination with the first aspect, in certain implementations of the first aspect, each third microstructure in the third microstructure array is a protruding structure, each of the protruding structures has a different slope, and / or each of the protruding structures has a different protruding height.

[0032] In combination with the first aspect, in some implementations of the first aspect, it is characterized in that the second reflective element is a convex reflector, a concave reflector or a plane reflector.

[0033] In a second aspect, an embodiment of the present application provides a vehicle, which includes a display device as described in the above-mentioned first aspect and any possible implementation of the first aspect.

[0034] In a third aspect, an embodiment of the present application provides a vehicle-mounted system, which includes a display device as described in the above-mentioned first aspect and any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of an application scenario of the HUD device provided in an embodiment of the present application.

[0036] Figure 2 The present invention is a schematic diagram of a scheme for matching the directions of the projection light of a HUD device and the image light by using a field lens.

[0037] Figure 3 The present invention is a schematic diagram of a scheme for simultaneously rotating an image sensor and a diffusion screen to adjust the directions of projection light and image light of a HUD device.

[0038] Figure 4 A schematic diagram of the structure of a display device 400 provided in an embodiment of the present application.

[0039] Figure 5 This is a side view of a first diffuser screen 500 provided in an embodiment of the present application.

[0040] Figure 6 This is a side view of a second diffuser screen 600 provided in an embodiment of the present application.

[0041] Figure 7 This is a front view of a third diffusion screen 700 provided in an embodiment of the present application.

[0042] Figure 8 This is a side view of the fourth diffuser screen provided in an embodiment of the present application.

[0043] Fig. 9 A schematic diagram of the structure of a display device 900 provided in an embodiment of the present application.

[0044] Fig.10 A side view of the first Fresnel lens 1000 provided in an embodiment of the present application.

[0045] Fig.11 This is a front view of the second Fresnel lens 1100 provided in an embodiment of the present application.

[0046] Fig.12 A schematic diagram of the structure of a display device 1200 provided in an embodiment of the present application.

[0047] Fig.13 A schematic diagram of a display device 400 provided in an embodiment of the present application for preventing glare caused by backflow of sunlight.

[0048] Fig.14 A schematic diagram of the structure of a display device 1400 provided in an embodiment of the present application.

[0049] Fig.15 A circuit diagram of a display device provided in an embodiment of the present application.

[0050] Fig.16 A schematic diagram of a possible functional framework of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0052] In order to facilitate understanding of the embodiments of the present application, the following explanation is made.

[0053] First, the terms "first", "second", "third", "fourth", etc. and various numbers in the text description or drawings of the embodiments of the present application shown below are only used for the convenience of description, and are not necessarily used to describe a specific order or sequence, and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different microstructure arrays or different diffusion screens, etc.

[0054] Second, the terms "including" and "having" and any variations thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0055] Third, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions, and the embodiments or designs described as "exemplary" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way for easy understanding.

[0056] Fourth, in the embodiment of the present application, image light refers to light carrying an image (or image information) and is used to generate an image.

[0057] Fifth, in the drawings of the present application, the thickness, size and shape of each optical element have been slightly exaggerated for the sake of convenience. Specifically, the shapes of the optical elements shown in the drawings are shown by way of example. For example, the shape of the curved mirror in the present application is not limited to the spherical or aspherical shapes shown in the drawings. Moreover, the drawings are only examples and are not drawn strictly to scale.

[0058] Sixth, unless otherwise defined, all terms (including technical terms and scientific terms) used in this application have the same meaning as commonly understood by a person of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0059] Figure 1 A schematic diagram of an application scenario of the HUD device provided in an embodiment of the present application. Figure 3As shown, the HUD device is installed on the car. The HUD device is used to project the vehicle status information, external object indication information and navigation information into the driver's field of vision through the vehicle's windshield. The status information includes but is not limited to driving speed, mileage, fuel level, water temperature and headlight status. The external object indication information includes but is not limited to safe vehicle distance, surrounding obstacles and reversing images. The navigation information includes but is not limited to direction arrows, distance and driving time.

[0060] Among them, the virtual image corresponding to the navigation information and the indication information of the external object can be superimposed on the real environment outside the vehicle, so that the driver can obtain the visual effect of augmented reality, for example, it can be used for augmented reality (AR) navigation, adaptive cruise, lane departure warning, etc. Since the virtual image corresponding to the navigation information can be combined with the real scene, the HUD device is usually coordinated with the advanced driving assistant system (ADAS) system of the car. In order not to interfere with the road conditions, the virtual image corresponding to the instrument information is usually about 2 to 3 meters away from the human eye. In order to better integrate the virtual image corresponding to the navigation information with the real road surface, the virtual image corresponding to the navigation information is generally about 7 to 15 meters away from the human eye. Among them, the position where the virtual image of the navigation information is located is called the far focal plane, and the plane where the virtual image of the instrument information is located is called the near focal plane.

[0061] At present, the research focus of HUD equipment is mainly on avoiding sunlight backflow and reducing the volume. Among them, in order to avoid glare caused by sunlight backflow and improve user experience, in HUD devices, the normal direction of the diffuser is usually set to not coincide with the main direction of the imaging light. For example, in common liquid crystal on silicon (LCoS) HUD devices and digital light processing (DLP) HUD devices, the normal direction of the diffuser is usually at an angle of 15° to 30° with the main direction of the imaging light, but the main direction of the image light projected by the display chip to the diffuser is usually less than or equal to 15°, resulting in the main direction of the image light incident on the diffuser screen and the main direction of the image light emitted from the diffuser screen being inconsistent, causing energy loss and affecting the imaging quality. In order to ensure the display effect of the HUD device, the angle arrangement between the PGU and the diffuser, and the angle arrangement between the diffuser and the reflective element (used to reflect the image light into the human eye) need to strictly comply with the design, resulting in limited spatial layout of the HUD device and difficulty in reducing the volume. In order to compensate for this design defect of the HUD device, in some solutions, a field lens, such as a cylindrical lens, is introduced into the HUD device to correct the angle of the image light incident on the diffusion screen. The optical path schematic diagram of this solution is shown in FIG. Figure 2 As shown. Figure 2In the embodiment, after the angle of the image light is corrected by the cylindrical lens, the main direction of the image light incident on the diffuser screen is consistent with the main direction of the image light exiting the diffuser screen. However, in this scheme, since the cylindrical lens is thicker and larger in size, more space is required in the HUD device to accommodate the cylindrical lens, resulting in a larger volume of the HUD device. At the same time, the thicker cylindrical lens will also affect the clarity of the imaging. In addition, the cylindrical lens will also increase the reflective surface of the system, resulting in stray light in the HUD device and increasing the probability of glare. In order to avoid the many defects caused by the introduction of field lenses, in other schemes, inclined diffusers and PGUs are used to eliminate the design defects of the HUD device, such as Figure 3 As shown. Figure 3 In the embodiment, a beam splitter prism is arranged between the image sensor LCoS or digital micromirror device (DMD) and the imaging lens, the diffusion screen is tilted 15° clockwise, and the angle between the image sensor LCoS or DMD and the optical axis is 87°. Although this solution does not introduce an additional field lens, after the image light passes through the tilted diffusion screen, the uniformity of the obliquely emitted image light is poor, resulting in poor imaging quality.

[0062] In view of this, the present application proposes a display device that can reduce the glare caused by sunlight backflow and improve the display effect. At the same time, it can also make the volume of the HUD device compact, overcoming the contradiction between the volume and display effect in the current display device.

[0063] Figure 4 FIG. 4 is a schematic diagram of a display device 400 provided in an embodiment of the present application. Figure 4 As shown, the display device 400 includes a projection module 401, a deflection module 402, a first reflective element 403 and a second reflective element 404. The projection module 401 is used to project image light to the deflection module 402. The deflection module 402 is used to change the emission direction of the incident image light and project the image light incident at different positions at different target deflection angles (specifically, Figure 4 The first reflecting element 403 is used to reflect the image light emitted by the deflection module 402 to the second reflecting element 404. The second reflecting element 404 is used to reflect the image light from the first reflecting element 403 to the human eye.

[0064] It should be noted that, in the present application, the deflection module 402 is used to change the direction of the image light emission, which means that the deflection module 402 can make the direction of the main light in the incident image light different from the main direction of the emitted image light, that is, the main light direction is deflected, so that the center of the diffuse spot of the emitted image light is deflected relative to the incident light. Figure 4When the deflection module 402 is used to reflect the image light (as shown in the following scene), the deflection module 402 can deflect the direction of the main light of the transmitted image light relative to the incident direction. Fig.12 In the scene shown in the figure), the deflection module 402 makes the reflection angle of the main light of the reflected image light different from the incident angle of the image light, that is, the deflection module 402 deflects the main light of the reflected image light relative to the incident direction at the time of incidence.

[0065] Optionally, the deflection module 402 is a diffusion screen, or the deflection module 402 is a combination of a Fresnel lens and a diffusion screen.

[0066] Next, combine Figures 5 to 8 The embodiment of the deflection module 402 provided in the present application is described in detail as a diffusion screen. Figures 9 to 11 Detailed Description The deflection module 402 provided in the present application is an embodiment of a combination of a Fresnel lens and a diffusion screen.

[0067] It can be understood that when the deflection element 402 is a diffusion screen, the deflection element 402 has only one optical element. In this case, the display device formed by the diffusion screen as the deflection element 402 is Figure 4 The display devices shown have the same structure.

[0068] Figure 5 This is a side view of the first diffuser screen 500 provided in the embodiment of the present application. Figure 5 As shown, the diffuser screen 500 includes a first surface 510 and a second surface 520, wherein the first surface 510 of the diffuser screen 500 includes a microstructure array 511, along a first direction ( Figure 5 The curvatures of the microstructures of the microstructure array 511 are different. The diffusion screen 500 is used to change the direction of the emitted image light in the first direction.

[0069] It should be noted that in the HUD system, the diffuser screen can use the image light to generate a relay image, and fully disperse the incident image light to produce an optical diffusion effect, that is, the diffuser screen can increase the diffusion angle of the outgoing image light. In the present application scheme, the diffuser screen 500 not only has the above-mentioned effects, but also has the function of changing the direction of the outgoing image light in the first direction. Specifically, since the curvatures of the multiple microstructures of the diffuser screen 500 in the first direction are different, the microstructures with different curvatures have different deflection effects on the incident image light from the PGU, so that the image light incident on the microstructures with different curvatures has different outgoing directions. Among them, the deflection effect of microstructures with different curvatures on the incident image light means that microstructures with different curvatures can change the direction of the main light in the incident image light, so that the direction of the main light is deflected, so that the center of the diffuse spot of the light emitted by different microstructures is deflected relative to the incident time. For example, as Figure 5 As shown, along the x direction of the diffuser screen, the microstructure array 511 of the first surface 510 of the diffuser screen 500 includes four microstructures (eg Figure 5 The curvatures of the four microstructures are different. Therefore, after the image light incident on the four microstructures passes through the four microstructures, the directions of the main light rays are deflected relative to the incident direction, and the deflection angles (such as Figure 5 α1, α2, α3, α4) are different.

[0070] It should also be noted that the curvature of each microstructure in the microstructure array is determined by the incident angle of the image light incident on each different microstructure, the deflection angle of the image light emitted by each microstructure, and the diffusion angle of the image light emitted by each microstructure. Exemplarily, for microstructure #1, its curvature is determined by the incident angle β1, the deflection angle α1 and the diffusion angle γ1. Specifically, when the system requires that the deflection angle of the main light passing through microstructure #1 is α1 and the diffusion angle is γ1, the incident angle β1 of the image light emitted by the PGU in the HUD system when it is incident on microstructure #1 can be combined, and the above angle parameters can be preset in the optical path simulation system (such as zemax or codeV), and the curvature of microstructure #1 along the first direction can be obtained by optimization. Similarly, the process of determining the curvature of microstructure #2, microstructure #3 and microstructure #4 is the same as that of determining microstructure #1. After the curvature of each microstructure is obtained, the surface processing parameters of the diffusion screen 300 can be further generated for processing. Optionally, the material of the diffusion screen 500 is polymethyl methacrylate (PMMA), polycarbonate (PC), optical glass, etc., which is not limited in the present application.

[0071] Optionally, the microstructure array 511 is a microlens array or a microstructure array with a concave-convex texture on the surface, which is not limited in the present application. Exemplarily, when the microstructure array 511 is a microlens array, the surface shape of each microlens in the microlens array can be a convex lens or a concave lens with a free-form surface, that is, the surface shape of the multiple microlenses of the microlens array includes at least one of a convex surface and a concave surface, as described below Figure 7 When the microstructure array 511 is a microstructure array with a concave-convex texture on the surface, the side view of the diffusion screen can be as shown in FIG. Figure 8 shown.

[0072] Optionally, in order to further reduce the aberration introduced by the microstructure and improve the imaging quality, the boundary of each microstructure is designed to be an irregular shape.

[0073] In some embodiments, in order to further improve the utilization rate of image light energy, the thicknesses of multiple microstructures in the microstructure array 511 can be designed to be different. In order to further reduce the diffraction effect generated when each microstructure in the microstructure array 511 transmits image light and improve the imaging quality, in more stringent scenarios, the thicknesses of any two microstructures can be designed to be different. The thickness of the microstructure refers to the length of the microlens along the optical axis direction of the light diffusion screen (or the main optical axis direction of the HUD device), for example Figure 5 The z-axis direction is shown.

[0074] It is understandable that in the diffuser screen 500, the curvatures of the four microstructures of the microstructure array 511 along the x direction are different. In other embodiments, the microstructure array of the diffuser screen provided by the present application has multiple microstructures with different curvatures along the first direction, that is, the multiple microstructures of the microstructure array have changes in the first direction, and it is not strictly required that the curvature of each microstructure in the first direction is different. For example, the curvatures of any two adjacent microstructures in the first direction may be different, or the curvatures of microstructures at any periodic interval in the first direction may be different.

[0075] Furthermore, it is understandable that Figure 5 The x-axis is used as the first direction for the purpose of illustration. In the present application, if the diffusion screen 500 is used to change the direction of the emitted image light in the first direction, the first direction may be any direction, that is, the first direction includes but is not limited to Figure 5 The x-axis direction shown may also be, for example, the y-axis direction or other directions.

[0076] It should be noted that the microstructure array of the diffusion screen provided in the present application is all over the first surface of the diffusion screen, that is, the microstructures are densely arranged on the first surface of the diffusion screen, as follows Figure 7 as shown in .

[0077] Figure 6 This is a side view of the second diffuser screen 600 provided in the embodiment of the present application. Figure 6 (a) is a side view of the diffuser screen 600 in the xoz plane. Figure 6 (b) is a side view of the diffuser screen 600 in the yoz plane. The diffuser screen 600 includes a first surface 610 and a second surface 620, wherein the first surface 610 of the diffuser screen 600 includes a microstructure array 611, along a first direction (i.e. Figure 6 The curvatures of the microstructures of the microstructure array 611 are different. Meanwhile, along the second direction ( Figure 6The curvatures of the plurality of microstructures of the microstructure array 611 are different, and the diffusion screen 600 is used to change the direction of the emitted image light in the first direction and the second direction at the same time.

[0078] and Figure 5 Compared with the diffuser screen 500 shown in FIG. 1 , the diffuser screen 600 is different in that the diffuser screen 600 can change the direction of the emitted image light in two directions. Figure 6 When the diffuser 600 changes the direction of the emitted image light in two directions, the curvatures of the multiple microstructures of the microstructure array included in the diffuser 600 along the two directions are different. The deflection effect of each microstructure on the image light can be referred to above. Figure 5 The relevant description in will not be repeated here. It can also be understood that Figure 6 Only the change in the direction of the principal light rays caused by each microstructure is shown.

[0079] It should be noted that Figure 6 The diffusion screen 600 is shown as an example in which the first direction is the x direction and the second direction is the y direction, that is, only an embodiment in which the first direction and the second direction are perpendicular to each other is shown. In some other embodiments, the first direction and the second direction may be any other non-overlapping directions, which is not limited in the present application.

[0080] It can be understood that when the curvature of the plurality of microstructures of the diffuser screen 600 along the first direction or along the second direction does not change, that is, the curvature of the plurality of microstructures of the diffuser screen 600 along the first direction or along the second direction is the same, the diffuser screen 600 can be considered to change the direction of the image light in one direction. At this time, the diffuser screen 600 can be considered to be Figure 5 The diffuser screen 500 shown, i.e., the diffuser screen 500 can be regarded as Figure 6 A particular form of diffuser screen 600 is shown.

[0081] It can also be understood that, according to different usage scenarios of the diffuser screen 600, the diffuser screen 600 can be designed so that the deflection angle of the image by the multiple microstructures along the first direction is the same as or different from the deflection angle of the image by the multiple microstructures along the second direction, and this application does not limit this.

[0082] In addition, for the description of the surface type, boundary shape, thickness of each microstructure included in the microstructure array 611 of the diffusion screen 600, as well as other descriptions such as the material of the diffusion screen 600, reference can be made to the above Figure 5 The relevant parts of are not repeated here.

[0083] Figure 7This is a front view of the third diffuser screen 700 provided in the embodiment of the present application. Specifically, the diffuser screen 700 can change the direction of the emitted image light in the x direction and the y direction at the same time, that is, the curvatures of the multiple microstructures of the diffuser screen 700 in the x direction and the y direction vary. Figure 7 As shown, there is a microlens array formed by closely packed free-form surfaces of at least one concave surface and a convex surface on the surface of the diffusion screen 700, wherein the boundary shape of each microlens is irregular, and the thickness of adjacent lenses is different. When the image light is emitted from the z-axis, each microlens can change the direction of the emitted image light in the x-direction and the y-direction at the same time. That is, after emission, a diffuse light spot is formed with the center direction off-axis in both the x-direction and the y-direction.

[0084] Understandably, Figure 7 Only an embodiment is shown in which the diffusion screen changes the emission direction of the image light in two perpendicular directions, and the two directions are perpendicular to the thickness direction of the microstructure in pairs, but the present application is not limited thereto.

[0085] It should be noted that the above Figures 5 to 8 The diffuser screen shown in the figure is only shown with a cross-sectional shape of a rectangle. The shape of the diffuser screen provided in the present application is not limited thereto. In some other embodiments, the cross-sectional shape of the diffuser screen may also be circular (for example, the diffuser screen is a thin cylinder), irregular, etc.

[0086] When the deflection element 402 is a combination of a Fresnel lens and a diffuser screen, the combination of the Fresnel lens and the diffuser screen together constitute the deflection element 402. In this case, the deflection element 402 has two optical elements. Fig. 9 It is a schematic structural diagram of a display device 900 when a combination of a Fresnel lens and a diffusion screen together constitutes a deflection element 402 , wherein the deflection element 402 is composed of a Fresnel lens 411 and a diffusion screen 412 .

[0087] In some embodiments, the deflection effect of the deflection element 402 on the light is borne by the Fresnel lens 411. In this case, the diffuser screen 412 is used to generate a relay image and increase the diffusion angle of the image light emitted to the first reflective element 403. In other embodiments, the deflection effect of the deflection element 402 on the light can be partially borne by the Fresnel lens 411 and the diffuser screen 412 according to different application requirements. Exemplarily, when the deflection module 402 is used to project image light incident at different positions onto the first reflective element 403 at different target deflection angles along one direction, such as the first direction, the Fresnel lens 411 can be used to project the image light onto the diffuser screen 412 at an angle less than the target deflection angle in the first direction, and the diffuser screen 412 continues to deflect the image light in the first direction, and finally the emitted image light is projected onto the first reflective element 403 at the target deflection angle. When the deflection module 402 is used to project image light incident at different positions onto the first reflective element 403 at different target deflection angles along two directions, the Fresnel lens 411 can be used to project the image light onto the diffuser screen 412 at the target deflection angle in the first direction, and the diffuser screen 412 is used to project the image light onto the first reflective element 403 at the target deflection angle in the second direction. Alternatively, the Fresnel lens 411 can be used to project the image light onto the diffuser screen 412 at an angle smaller than the target deflection angle in the first direction and the second direction, and the diffuser screen 412 changes the deflection angle of the image light in the first direction and the second direction at the same time, so that the final emitted image light is projected onto the first reflective element 403 at the target deflection angle.

[0088] Fig.10 The side view of the first Fresnel lens 1000 provided in the embodiment of the present application, the Fresnel lens 1000 may be an example of the above-mentioned Fresnel lens 411, and is applied to the above-mentioned Fig. 9 In the display device shown. Fig.10 In the embodiment, the Fresnel lens 1000 includes a first surface 1010 and a second surface 1020. The first surface 1010 of the Fresnel lens 1000 includes a microstructure array 1011 along a first direction ( Fig.10 The curvatures of the multiple microstructures of the microstructure array 1011 are different. The Fresnel lens 1000 is used to change the direction of the emitted image light in the first direction.

[0089] Specifically, in the Fresnel lens 1000, microstructures with different curvatures are used to change the main direction of the image light, so that the main direction of the outgoing image light is deflected. The curvature of each microstructure is determined by the incident angle of the image light incident on each different microstructure, the deflection angle of the image light emitted by each microstructure, and the diffusion angle of the image light emitted by each microstructure. Exemplarily, for any microstructure in the microstructure array 1011, the curvature can be determined as the slope and / or protrusion height of the microstructure protrusion by the incident angle of the image light incident on the microstructure, the designed target deflection angle, and the designed target diffusion angle.

[0090] It should be noted that the Fresnel lens 1000 can be used to completely change the deflection angle of the outgoing image light, that is, the image light emitted from the different microstructures of the Fresnel lens 1000 is emitted to the diffuser 412 at a target deflection angle. At this time, the diffuser 412 does not change the main direction of the incident image light, that is, the diffuser 412 does not change the main direction of the outgoing image light. Alternatively, the Fresnel lens 1000 can be used to partially change the deflection angle of the outgoing image light. If the target deflection angle of the image light emitted by the deflection module 402 is Fig.10 In the first direction shown, the image light emitted from the different microstructures of the Fresnel lens 1000 is emitted at an angle less than the target deflection angle in the first direction. At this time, the diffuser 412 continues to change the deflection angle of the image light in the first direction, so that the image light emitted from the diffuser 412 is finally emitted at the target deflection angle. It can be understood that at this time, the diffuser 412 is not only used to generate a relayed magnified image and increase the diffusion angle of the displayed image, but also used to change the deflection angle of the emitted image light. The possible structure of the diffuser 412 can refer to the above Figures 5 to 7 The relevant instructions in will not be repeated here.

[0091] Optionally, the material of the Fresnel lens 1000 is PMMA, PC or optical glass, etc., which is not limited in this application.

[0092] It is understandable that in the Fresnel lens 1000, the curvatures of the multiple microstructures of the microstructure array 1011 along the x direction are different as an example for explanation. In some other embodiments, the first direction may be any other direction designed according to the application requirements of the display device. In addition, the curvatures of the multiple microstructures of the Fresnel lens along the first direction may be the same or different, which is also determined according to the application scenario and requirements.

[0093] Fig.11 The front view of the second Fresnel lens 1100 provided in the embodiment of the present application, the Fresnel lens 1100 may be an example of the above-mentioned Fresnel lens 411, and is applied to the above-mentioned Fig. 9In the display device shown in FIG. 1 , the first surface 1110 of the Fresnel lens 1100 includes a microstructure array 1111 along a first direction (i.e., Fig.11 The curvatures of the multiple microstructures of the microstructure array 1111 are different. Meanwhile, along the second direction ( Fig.11 The curvatures of the multiple microstructures of the microstructure array 1111 are different, and the Fresnel lens 1100 is used to change the direction of the emitted image light in the first direction and the second direction at the same time.

[0094] and Fig.10 Compared with the Fresnel lens 1000 shown in FIG. 1 , the difference between the Fresnel lens 1100 and the Fresnel lens 1100 is that the Fresnel lens 1100 can change the direction of the outgoing image light in two directions. It can be understood that when Fig.11 When the Fresnel lens 1100 changes the direction of the emitted image light in two directions, the curvatures of the multiple microstructures of the microstructure array included in the Fresnel lens 1100 along the two directions are different. The deflection effect of each microstructure on the image light can be referred to above. Figure 5 The relevant instructions in will not be repeated here.

[0095] Similarly, the Fresnel lens 1100 can be used to completely change the deflection angle of the outgoing image light, that is, the image light emitted from the different microstructures of the Fresnel lens 1100 is emitted to the diffuser 412 at target deflection angles in two directions. At this time, the diffuser 412 does not change the main direction of the incident image light, that is, the diffuser 412 does not change the main direction of the outgoing image light. Alternatively, the Fresnel lens 1100 can be used to partially change the deflection angle of the outgoing image light. If the target deflection angle of the image light emitted by the deflection module 402 is Fig.11 In the first direction and the second direction shown, in some embodiments, the image light emitted from the different microstructures of the Fresnel lens 1000 is emitted at a target deflection angle in the first direction, and at this time, the diffuser screen 412 is used to make the image light emit at the target deflection angle in the second direction. Alternatively, in other embodiments, the image light emitted from the different microstructures of the Fresnel lens 1000 is emitted to the diffuser screen 412 at a deflection angle less than the target in both the first direction and the second direction, and then the different microstructures of the diffuser screen 412 emit the image light at the target deflection angle in the first direction and the second direction.

[0096] It should be noted that the Fresnel lens 1100 is used to completely change the deflection angle of the outgoing image light, or to partially change the deflection angle of the outgoing image light, which is related to the use scenario of the display device and is not limited in this application.

[0097] It should be noted that Fig.11The Fresnel lens 1100 is shown as an example in which the first direction is the x direction and the second direction is the y direction. In some other embodiments, the first direction and the second direction may be any other non-overlapping directions, which may be determined according to the application scenario of the display device and are not limited in this application.

[0098] It can also be understood that, according to different usage scenarios of the Fresnel lens 1100, the Fresnel lens 1100 can be designed so that the deflection angle of the image caused by the multiple microstructures along the first direction is the same as or different from the deflection angle of the image caused by the multiple microstructures along the second direction, and this application does not limit this.

[0099] In addition, for other descriptions of the material of the Fresnel lens 1100 and the curvature design of the microstructure, reference can be made to the above Fig.10 The relevant parts of are not repeated here.

[0100] It should also be noted that in the display device provided in the present application, the projection module 401 can adopt an LCoS display, an organic light-emitting diode (OLED) display, a liquid crystal display (LCD), a digital light processing (DLP) display or a micro-electro-mechanical system (MEMS) display, etc., and the present application does not limit it.

[0101] In addition, the first reflective element 403 may be a concave mirror, a convex mirror or a plane mirror with a free-form surface, which is not limited in the present application.

[0102] It is understandable that the number of reflective elements included in the display device 400 is not limited to Figure 4 As shown, it can be adjusted accordingly according to needs.

[0103] Optionally, the display device 400 may further include a dust cover 405. The dust cover 405 has the functions of isolating the external high temperature, preventing the internal temperature of the display device 400 from being too high, or preventing external dust from entering the device.

[0104] Fig.12 FIG. 1 is a schematic diagram of a display device 1200 provided in an embodiment of the present application. Compared with the display device 400, Fig.12 In the display device 1200, the deflection element 1202 is used to change the emission direction of the incident image light, and reflect the image light incident at different positions to the first reflective element 403 at different target deflection angles. Fig.12As shown, the display device 1200 includes a projection module 401, a deflection module 1202, a first reflective element 403 and a second reflective element 404. The projection module 401 is used to project image light to the deflection module 402. The deflection module 1202 is used to change the emission direction of the incident image light and project the image light incident at different positions at different target deflection angles (specifically, Fig.12 The first reflecting element 403 is used for reflecting the image light emitted by the deflection module 402 to the second reflecting element 404. The second reflecting element 404 is used for reflecting the image light from the first reflecting element 403 to the human eye.

[0105] It should be noted that in Fig.12 In the figure, the deflection module 1202 is used to project image light incident at different positions at different target deflection angles, which means that the deflection module 1202 makes the reflection angle of the main light of the reflected image light different from the incident angle of the image light, that is, the deflection module 1202 makes the main light of the reflected image light deflected relative to the incident direction at the time of incidence.

[0106] It is understood that the deflection element 1202 can also be a single diffuser screen, as described above. Figures 5 to 7 As shown, or it can be a combination of a Fresnel lens and a diffuser screen, as described above Fig. 9 It can also be understood that when the deflection element 1202 is used as a reflective element, the curvature of the microstructure in the deflection element 1202 is determined by the incident angle of the image light incident on each different microstructure, the deflection angle of the image light reflected by each microstructure, and the diffusion angle of the image light emitted by each microstructure.

[0107] Based on the above embodiments of several display devices provided by the present application (including Figure 4 , Fig. 9 and Fig.12 ), it can be seen that in the display device provided by the present application, the microstructures with different curvatures in the microstructure array included in the deflection element deflect the image light, thereby achieving the adjustment of the image light angle before and after the diffusion screen in the display device. Taking the display device 400 as an example, in Fig.13In the embodiment, when sunlight flows back from the outside to the deflection element 402 in the display device 400, since the incident angle of the sunlight incident on the deflection element 402 does not match the curvature of the microstructure, the sunlight reflected by the deflection element 402 is difficult to be reflected again onto the first reflecting element 403, so it is difficult to form stray light. In addition, since the curvature of the microstructure in the deflection element 402 can be designed accordingly according to the incident angle, target exit angle and target diffusion angle of the image light emitted by the projection module 401 in the display device 400 incident on the microstructure, the relative position of the deflection element 402 and the projection module 401, and the spatial layout of the deflection module 402 and the rear-end optical path elements (including the first reflecting element 403 and the second reflecting element 404) can be more compact. Exemplarily, the placement of the deflection module 402 to the rear-end optical path elements does not have to be strictly in accordance with the position of the main light. In this case, the angle between the deflection module 402 and the main light can be arranged to be larger, such as Fig.14 The display device 1400 shown can reasonably utilize the space between the projection module 402 and the second reflective element 404 while reducing the brightness of the glare caused by the backflow of sunlight, so that the structure of the display device is more compact.

[0108] In addition, the embodiment of the present application further provides a means of transportation, which is any of the above-mentioned display devices. The means of transportation includes but is not limited to a car, an airplane, a train, or a ship.

[0109] Fig.15 This is a circuit diagram of a display device provided in an embodiment of the present application. Fig.15 As shown, the circuit in the display device mainly includes a host CPU 1201, an external memory interface 1202, an internal memory 1203, an audio module 1204, a video module 1205, a power module 1206, a wireless communication module 1207, an I / O interface 1208, a video interface 1209, a display circuit 1210 and a modulator 1212. Among them, the host processor 1201 and its peripheral components, such as the external memory interface 1202, the internal memory 1203, the audio module 1204, the video module 1205, the power module 1206, the wireless communication module 1207, the I / O interface 1208, the video interface 1209, and the display circuit 1210 can be connected through a bus. The host processor 1201 can be called a front-end processor.

[0110] In addition, the circuit diagrams shown in the embodiments of the present application do not constitute a specific limitation on the display device. In other embodiments of the present application, the display device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0111] The main processor 1201 includes one or more processing units, for example, the main processor 1201 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processor (NPU), etc. Different processing units may be independent devices or integrated in one or more processors.

[0112] The main processor 1201 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the main processor 1201 is a cache memory. The memory may store instructions or data that the main processor 1201 has just used or cyclically used. If the main processor 1201 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the main processor 1201, and thus improves the efficiency of the system.

[0113] In some embodiments, the display device may further include a plurality of input / output (I / O) interfaces 1208 connected to the main processor 1201. The interface 1208 may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc. The above-mentioned I / O interface 1208 may be connected to devices such as a mouse, a touchpad, a keyboard, a camera, a speaker / speaker, a microphone, etc., and may also be connected to physical buttons on the display device (such as a volume button, a brightness adjustment button, a power button, etc.).

[0114] The external memory interface 1202 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the display device. The external memory card communicates with the main processor 1201 through the external memory interface 1202 to implement a data storage function.

[0115] The internal memory 1203 can be used to store computer executable program codes, which include instructions. The internal memory 1203 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting 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.), etc. In addition, the internal memory 1203 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (Universal Flash Storage, UFS), etc. The main processor 1201 executes various functional applications and data processing of the display device by running instructions stored in the internal memory 1203 and / or instructions stored in a memory provided in the main processor 1201.

[0116] The display device can implement audio functions such as music playing and calls through the audio module 1204 and the application processor.

[0117] The audio module 1204 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 1204 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 1204 can be arranged in the main processor 1201, or some functional modules of the audio module 1204 can be arranged in the main processor 1201.

[0118] The video interface 1209 can receive external audio and video signals, which can be specifically a high-definition multimedia interface (HDMI), a digital video interface (DVI), a video graphics array (VGA), a display port (DP), etc. The video interface 1209 can also output video to the outside. When the display device is used as a head-up display, the video interface 1209 can receive speed signals and power signals input from peripheral devices, and can also receive external AR video signals. When the display device is used as a projector, the video interface 1209 can receive video signals input from an external computer or terminal device.

[0119] The video module 1205 can decode the video input by the video interface 1209, for example, by performing H.264 decoding. The video module can also encode the video collected by the display device, for example, by performing H.264 encoding on the video collected by the external camera. In addition, the main processor 1201 can also decode the video input by the video interface 1209, and then output the decoded image signal to the display circuit 1210.

[0120] The display circuit 1210 and the modulator 1212 are used to display the corresponding image. In this embodiment, the video interface 1209 receives an external video source signal, and the video module 1205 decodes and / or digitally processes the video signal and outputs one or more image signals to the display circuit 1210. The display circuit 1210 drives the modulator 1212 to image the incident polarized light according to the input image signal, and then outputs at least two imaging lights. In addition, the main processor 1201 can also output one or more image signals to the display circuit 1210.

[0121] In this embodiment, the display circuit 1210 and the modulator 1212 are electronic components in the PGU, and the display circuit 1210 can be called a driving circuit.

[0122] The power module 1206 is used to provide power to the main processor 1201 and the light source 1200 according to the input power (e.g., direct current), and the power module 1206 may include a rechargeable battery, which can provide power to the main processor 1201 and the light source 1200. The light emitted by the light source 1200 can be transmitted to the modulator 1211 for imaging, thereby forming an image light signal.

[0123] The wireless communication module 1207 enables the display device to communicate wirelessly with the outside world, and can provide wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR) and other wireless communication solutions. The wireless communication module 1207 can be one or more devices integrating at least one communication processing module. The wireless communication module 1207 receives electromagnetic waves via an antenna, modulates the frequency of the electromagnetic wave signal and performs filtering processing, and sends the processed signal to the main processor 1201. The wireless communication module 1207 can also receive the signal to be sent from the main processor 1201, modulate the frequency of the signal, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0124] In addition, in addition to being input through the video interface 1209, the video data decoded by the video module 1205 can also be wirelessly received through the wireless communication module 1207 or read from an external memory. For example, the display device can receive video data from a terminal device or an in-vehicle entertainment system through the wireless LAN in the vehicle, and the display device can also read audio and video data stored in an external memory.

[0125] The above display device can be installed on a vehicle, see Fig.16 , Fig.16 It is a possible functional framework diagram of a means of transportation provided in an embodiment of the present application.

[0126] like Fig.16As shown, the functional framework of the vehicle may include various subsystems, such as the sensor system 12, the control system 14, one or more peripheral devices 16 (one is shown as an example), the power supply 18, the computer system 20 and the head-up display system 22. Optionally, the vehicle may also include other functional systems, such as an engine system that provides power for the vehicle, etc., which is not limited in this application.

[0127] The sensor system 12 may include a number of detection devices, which 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. As shown in the figure, 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 position sensor, or other components for automatic detection, etc., and the present application does not limit them.

[0128] The control system 14 may include several components, such as the steering unit, brake unit, lighting system, automatic driving system, map navigation system, network timing system and obstacle avoidance system shown in the figure. Optionally, the control system 14 may also include components such as a throttle controller and an engine controller for controlling the vehicle's speed, which are not limited in this application.

[0129] The peripheral device 16 may include several components, such as the communication system, touch screen, user interface, microphone, and speaker shown in the figure. The communication system is used to realize network communication between the vehicle and other devices other than the vehicle. In practical applications, the communication system may use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through network cables or optical fibers.

[0130] The power source 18 represents a system that provides power or energy for the vehicle, which may include but is not limited to a rechargeable lithium battery or a lead-acid battery, etc. In practical applications, one or more battery components in the power source are used to provide power or energy for starting the vehicle, and the type and material of the power source are not limited in this application.

[0131] Several functions of the vehicle are controlled and implemented by the computer system 20. The computer system 20 may include one or more processors 2001 (one processor is shown as an example) and a memory 2002 (also referred to as a storage device). In actual applications, the memory 2002 is also inside the computer system 20, or it may be outside the computer system 20, for example, as a cache in the vehicle, etc., which is not limited in this application.

[0132] The processor 2001 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2001 may be used to run related programs or instructions corresponding to the programs stored in the memory 2002 to implement corresponding functions of the vehicle.

[0133] The memory 2002 may include a volatile memory, such as a RAM; the memory may also include a non-volatile memory, such as a ROM, a flash memory, a HDD or a solid-state drive SSD; the memory 2002 may also include a combination of the above-mentioned types of memories. The memory 2002 may be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2001 calls the program codes or instructions stored in the memory 2002 to implement the corresponding functions of the vehicle. In the present application, a set of program codes for vehicle control may be stored in the memory 2002, and the processor 2001 calls the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in the present application.

[0134] Optionally, in addition to storing program codes or instructions, the memory 2002 may also store information such as road maps, driving routes, sensor data, etc. The computer system 20 may be combined with other elements in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc., to implement relevant functions of the vehicle. For example, the computer system 20 may control the driving direction or driving speed of the vehicle based on the data input from the sensor system 12, which is not limited in this application.

[0135] The head-up display system 22 may include several components, such as the windshield shown in the figure, a controller and a head-up display. The controller 222 is used to generate images according to user instructions (for example, images containing vehicle status such as vehicle speed, battery / fuel level, and images of augmented reality AR content), and send the image to the head-up display for display; the head-up display may include an image generation unit and a reflector combination, and the windshield is used to cooperate with the head-up display to realize the optical path of the head-up display system so that the target image is presented in front of the driver. Among them, the functions of some components in the head-up display system can also be implemented by other subsystems of the vehicle. For example, the controller can also be a component in the control system.

[0136] Among them, this application Fig.16 The four subsystems shown are sensor system 12, control system 14, computer system 20 and head-up display system 22, which are only examples and do not constitute limitations. In actual applications, vehicles can combine several components in the vehicle according to different functions to obtain subsystems with corresponding different functions. In actual applications, vehicles can include more or fewer systems or components, which is not limited in this application.

[0137] The above-mentioned means of transportation can be a car, truck, motorcycle, bus, ship, airplane, helicopter, lawn mower, recreational vehicle, amusement park vehicle, construction equipment, tram, golf cart, train, and cart, etc., and the embodiments of the present application are not particularly limited.

[0138] Unless otherwise defined, technical or scientific terms used herein shall have the common meanings understood by one of ordinary skill in the art to which the present disclosure belongs.

[0139] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the present application shall be included in the protection scope of the present application.

Claims

1. A display device, characterized in that: include: A projection module, a deflection module, a first reflection element and a second reflection element, The projection module is used to project image light to the deflection module; The deflection module is used to project the image light incident at different positions onto the first reflective element at different target deflection angles; The first reflecting element is used to reflect the image light emitted by the deflection module to the second reflecting element; The second reflecting element is used to reflect the image light from the first reflecting element toward human eyes.

2. The display device according to claim 1, characterized in that The deflection module is a first diffusion screen, and the first surface of the first diffusion screen includes a first microstructure array. The multiple first microstructures of the first microstructure array have different curvatures in the first direction. The first diffusion screen is specifically used to: project the image light incident at different positions along the first direction onto the first reflecting element at different target deflection angles.

3. The display device according to claim 2, characterized in that: The curvatures of the plurality of first microstructures of the first microstructure array in the second direction are different, and the first diffusion screen is further used to change the emission direction of the image light in the second direction.

4. The display device according to claim 3, characterized in that: The thicknesses of the plurality of first microstructures of the first microstructure array in the third direction are different.

5. The display device according to claim 4, characterized in that: Any two adjacent first microstructures in the first microstructure array have different thicknesses.

6. The display device according to claim 4 or 5, characterized in that: Two directions among the first direction, the second direction and the third direction are perpendicular to each other.

7. The display device according to any one of claims 2 to 6, characterized in that: The first microstructure array is a first microlens array.

8. The display device according to claim 7, characterized in that: The surface shape of the plurality of first microlenses in the first microlens array includes at least one of a convex surface and a concave surface.

9. The display device according to claim 7 or 8, characterized in that: The boundaries of the plurality of first microlenses have irregular shapes.

10. The display device according to any one of claims 2 to 6, characterized in that: The surface of each first microstructure in the first microstructure array presents a concave-convex texture.

11. The display device according to any one of claims 2 to 10, characterized in that: The curvature of the first microstructure in the first microstructure array is determined by the incident angle of the image light incident on the first microstructure, the deflection angle of the image light emitted by the first microstructure, and the diffusion angle of the image light emitted by the first microstructure, and the first microstructure is any first microstructure in the first microstructure array.

12. The display device according to claim 1, characterized in that: The deflection module comprises a first Fresnel lens and a second diffusion screen, wherein: The first surface of the first Fresnel lens includes a second microstructure array, and the curvatures of the plurality of second microstructures of the second microstructure array in the first direction are different. The first Fresnel lens is specifically used to: project the image light incident at different positions along the first direction onto the second diffusion screen at different target deflection angles; The second diffusion screen generates a relay image using the image light emitted from the first Fresnel lens, and increases a diffusion angle of the image light emitted toward the first reflection element.

13. The display device according to claim 12, characterized in that: The multiple second microstructures of the second microstructure array have different curvatures in the second direction, and the first Fresnel lens is further used to project the image light incident from different positions onto the second diffusion screen at different target deflection angles along the second direction.

14. The display device according to claim 12 or 13, characterized in that: Each second microstructure in the second microstructure array is a protruding structure, and each of the protruding structures has a different slope and / or each of the protruding structures has a different protruding height.

15. The display device according to claim 1, characterized in that: The deflection module includes a second Fresnel lens and a third diffusion screen, wherein: The first surface of the second Fresnel lens includes a third microstructure array, and the curvatures of the plurality of third microstructures of the third microstructure array in the first direction are different. The second Fresnel lens is specifically used to: project the image light incident at different positions along the first direction onto the third diffusion screen at different target deflection angles; The first surface of the third diffusion screen includes a fourth microstructure array, and the curvatures of the plurality of fourth microstructures of the fourth microstructure array in the second direction are different. The third diffusion screen is specifically used to project the image light incident at different positions onto the first reflective element at different target deflection angles along the second direction.

16. The display device according to claim 15, characterized in that: Each third microstructure in the third microstructure array is a protruding structure, and each of the protruding structures has a different slope and / or each of the protruding structures has a different protruding height.

17. The display device according to any one of claims 1 to 16, characterized in that: The second reflective element is a convex reflector, a concave reflector or a plane reflector.

18. A means of transport, characterized in that: The invention comprises the display device as claimed in any one of claims 1 to 17.

19. A vehicle-mounted system, characterized in that: A display device comprising any one of claims 1 to 17.

Images