Image source, display device, vehicle-mounted system and vehicle

Abstract

The utility model provides a display device, an image source, a vehicle-mounted system and a vehicle. A polarization modulation module or a filtering module is arranged at the position optically conjugated with a user eye box, the polarization direction of image light is changed through polarization modulation, meanwhile, the image light in different polarization directions is selected through filtering, an image generation unit can generate two adjacent frames of images through all pixels, and the image generation efficiency is improved. According to the technical scheme, separation of image light at different visual angles is achieved, high display resolution is guaranteed, a polarization element is prevented from being arranged at the position of a user eye box, an automatic stereoscopic image display system can be achieved, and more comfortable user experience is provided for viewers. Besides, the left eye stereoscopic view and the right eye stereoscopic view can be more accurately controlled by utilizing the polarization characteristic of image light and filtering selection, crosstalk between the left eye image and the right eye image is reduced, and the effect of improving the display quality is achieved.

Description

Technical Field

[0001] The present application relates to the fields of display technology and intelligent automobile driving technology, and more specifically, to an image source, a display device, a vehicle-mounted system and a vehicle. Background Art

[0002] Three-dimensional (3D) display uses the principle of binocular parallax to simulate the human eye's perception of depth. This process is done by displaying at least two offset two-dimensional (2D) images to the viewer's left and right eyes, so that the viewer's brain combines at least two offset 2D images to produce a stereoscopic depth perception. Currently, 3D displays generally have many disadvantages, such as low resolution of displayed images, large display system size and high price. Utility Model Content

[0003] The present application provides an image source, a display device, a vehicle-mounted system and a vehicle, which have small size, high imaging resolution and excellent display effect.

[0004] In a first aspect, the present application provides a display device, which includes an image generating unit, a polarization modulation module and a filtering module, wherein the polarization modulation module or the filtering module is located at a position optically conjugate with a user's eye box, wherein the image generating unit is used to emit a first image light at a first moment and emit a second image light at a second moment, and a first image corresponding to the first image light and a second image corresponding to the second image light are two adjacent frames of images; the polarization modulation module is used to generate at least one polarized image light based on the first image light or the second image light, and emit the at least one polarized image light to the filtering module; the filtering module is used to select and emit a first polarized image light, and the first polarized image light is used to generate the first image or the second image, and the first polarized image light is one of the at least one polarized image light.

[0005] In some embodiments, the polarization modulation module is a polarization modulator, and the filtering module is a first polarization filter and a second polarization filter. In this case, the polarization modulator generates a polarized image light based on the first image light or the second image light. In this case, the first polarization filter and the second polarization filter are used to selectively transmit the polarized image light generated by the polarization modulator. In other embodiments, the polarization modulation module is a first polarization modulator and a second polarization modulator, and the filtering module is a polarization beam splitter. In this case, the first polarization modulator generates two corresponding polarized image lights based on the first image light or the second image light, such as the third image light and the fourth image light, and the second polarization modulator generates two corresponding polarized image lights based on the first image light or the second image light, such as the fifth image light and the sixth image light, and in this case, the polarization beam splitter is used to selectively reflect one of the third image light and the fifth image light, or to selectively reflect one of the fourth image light and the sixth image light.

[0006] By placing the polarization modulation module or the filtering module at a position optically conjugate with the user's eye box, the image light of different viewing angles can be separated, which helps to realize an automatic stereoscopic image display system, can be applied to more display scenarios, and can provide viewers with a more comfortable user experience. In addition, the polarization characteristics of the image light and the filtering selection can more accurately control the left and right eye stereoscopic views, reduce the crosstalk between the left and right eye images, and achieve the effect of improving the display quality.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the polarization modulation module includes a first polarization modulator, and the first polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image, and the first polarization direction and the second polarization direction are orthogonal, the third image light is used to generate the first image, and the fourth image light is used to generate the second image.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the filtering module is located at a position optically conjugate with the user eye box, and the filtering module includes a first polarization filter and a second polarization filter, the polarization direction of the first polarization filter is the first polarization direction, and the polarization direction of the second polarization filter is the second polarization direction, wherein the first polarization filter is used to transmit the third image light; and the second polarization filter is used to transmit the fourth image light.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the display device further includes a polarization conversion element, wherein the polarization conversion element is located in the light exit direction of the first polarization filter, and the polarization conversion element is used to convert the polarization direction of the third image light into the second polarization direction; or, the polarization conversion element is located in the light exit direction of the second polarization filter, and the polarization conversion element is used to convert the polarization direction of the fourth image light into the first polarization direction.

[0010] In combination with the first aspect, in some implementations of the first aspect, the polarization conversion element is a half-wave plate.

[0011] By introducing a 1 / 2 wave plate in the display device, when the image light emitted by the display device is p-polarized light, the p-polarized light can be converted into s-polarized light that is more conducive to imaging of the HUD display system, thereby achieving the purpose of improving the display quality.

[0012] In combination with the first aspect, in some implementations of the first aspect, the polarization modulation module is located at a position optically conjugate with the user eye box, the polarization modulation module includes a first polarization modulator and a second polarization modulator, and the display device also includes a first reflective element, the first polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image light; the second polarization modulator is used to generate a fifth image light of a second polarization direction based on the first image light, or to generate a sixth image light of a first polarization direction based on the second image light; the first reflective element is used to reflect the third image light and the fifth image light to the filter module, or to reflect the fourth image light and the sixth image light to the filter module. In combination with the second aspect, in some implementations of the second aspect, the filter module includes a polarization beam splitter, wherein the polarization beam splitter is used to transmit the image light of the first polarization direction and reflect the image light of the second polarization direction.

[0013] In combination with the first aspect, in some implementations of the first aspect, the display device also includes a diffusion screen, which is located between the image generating unit and the polarization modulation module, and the diffusion screen is used to diffuse the first image light to generate diffused first image light, and generate a relay image of the first image based on the first image light, or to diffuse the second image light to generate diffused second image light, and generate a relay image of the second image based on the second image light.

[0014] In combination with the first aspect, in some implementations of the first aspect, the display device also includes a diffusion screen, which is located between the first polarization modulator and the filtering module, and the diffusion screen is used to diffuse the third image light to generate diffused third image light, and generate a relay image of the first image based on the third image light; or, to diffuse the fourth image light to generate diffused fourth image light, and generate a relay image of the second image based on the fourth image light.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the filtering module is located at a position optically conjugate with the user eye box, and the filtering module includes a first polarization filter and a second polarization filter, the polarization direction of the first polarization filter is the first polarization direction, and the polarization direction of the second polarization filter is the second polarization direction, wherein the first polarization filter is used to transmit the diffused third image light; and the second polarization filter is used to transmit the diffused fourth image light.

[0016] In a second aspect, the present application provides an image source. The image source includes: an image generation unit and a polarization modulator, wherein the image generation unit is used to emit a first image light at a first moment and emit a second image light at a second moment, and a first image corresponding to the first image light and a second image corresponding to the second image light are two adjacent frames of images; the polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image, the first polarization direction and the second polarization direction are orthogonal, the third image light is used to generate the first image, and the fourth image light is used to generate the second image.

[0017] By changing the polarization directions of the first image light and the second image light through the polarization modulator, the image generation unit can use all pixels to generate two adjacent frames of images, thereby ensuring the high resolution of the image source. In addition, the polarization modulator quickly switches between orthogonal polarizations, enabling the left and right eyes of the viewer to simultaneously view the left and right images, thereby bringing a 3D viewing experience. Therefore, when the image source provided by the present application is applied to a display device, it is helpful to realize 2D and 3D image display through a single image source.

[0018] In combination with the second aspect, in some implementations of the second aspect, the image source also includes a diffusion screen, which is located between the image generating unit and the polarization modulator, and the diffusion screen is used to diffuse the first image light to generate diffused first image light, and emit the diffused first image light to the polarization modulator, and generate a relay image of the first image based on the first image light; or, to diffuse the second image light to generate diffused second image light, and emit the diffused second image light to the polarization modulator, and generate a relay image of the second image based on the second image light; the polarization modulator is specifically used to: modulate the diffused first image light to generate the third image light, or modulate the diffused second image light to generate the fourth image light.

[0019] In combination with the second aspect, in some implementations of the second aspect, the image source also includes a diffusion screen, and the diffusion screen is located in the light emitting direction of the polarization modulator. The polarization modulator is specifically used to: modulate the first image light to generate the third image light, or modulate the second image light to generate the fourth image light; the diffusion screen is used to diffuse the third image light to generate diffused third image light, and generate a relay image of the first image based on the third image light; or to diffuse the fourth image light to generate diffused fourth image light, and generate a relay image of the second image based on the fourth image light.

[0020] The design of a diffusion screen that does not pass through the position is implemented for different PGUs, making the application scenarios of the image source provided by the present application more diverse.

[0021] In combination with the second aspect, in certain implementations of the second aspect, the first image light and the second image light are image lights in a third polarization direction, and the third polarization direction is the same as the first polarization direction, or the third polarization direction is the same as the second polarization direction.

[0022] In combination with the second aspect, in some implementations of the second aspect, the image source is used to generate a two-dimensional 2D image, or the image source is used to generate a three-dimensional 3D image.

[0023] In combination with the second aspect, in some implementations of the second aspect, the image generation unit and the polarization modulator are integrated into the same module.

[0024] By integrating the image generation unit and the polarization modulator into the same module, the volume of the image source can be further reduced, which is conducive to the realization of a small-volume display device.

[0025] In a third aspect, an embodiment of the present application provides a vehicle-mounted system, which includes a display device as in the above-mentioned first aspect and any one of the implementation methods of the first aspect.

[0026] In a fourth aspect, an embodiment of the present application provides a vehicle, comprising a display device and a windshield as in the first aspect and any one of the implementations of the first aspect, or comprising the vehicle-mounted system and the windshield in the implementation of the third aspect, wherein the windshield is used to reflect the image light emitted from the display device to the human eye. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of an application scenario of the HUD device provided in an embodiment of the present application.

[0028] Figure 2 A schematic diagram of the structure of an image source 200 provided in an embodiment of the present application.

[0029] Figure 3 A schematic diagram of a first image 303 and a second image 304 displayed on a display area 302 of a windshield 301 provided in an embodiment of the present application.

[0030] Figure 4 2 is a schematic diagram of the structure of a PGU 201 applicable to an embodiment of the present application.

[0031] Figure 5 A schematic structural diagram of a first display device 500 provided in an embodiment of the present application.

[0032] Figure 6 A schematic diagram of an optical path 1000 of a HUD display system in which a display device 500 provided in an embodiment of the present application is applied.

[0033] Figure 7 A schematic structural diagram of a second display device 700 provided in an embodiment of the present application.

[0034] Figure 8 A schematic diagram of an optical path 2000 of a vehicle in which a display device 700 provided in an embodiment of the present application is applied.

[0035] Fig. 9 A circuit diagram of a display device provided in an embodiment of the present application.

[0036] Fig.10 A schematic diagram of a possible functional framework of a vehicle provided in an embodiment of the present application.

[0037] Fig.11 A schematic functional block diagram of a mobile carrier 25 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0039] In order to facilitate understanding of the embodiments of the present application, the following explanation is made.

[0040] First, the terms "first", "second", etc. and various numbers in the text descriptions 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, the first image light and the second image light are image lights at different times.

[0041] 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.

[0042] 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.

[0043] Fourth, in the embodiments of the present application, image light refers to light that carries an image (or image information) and is used to generate an image, and may also be referred to as imaging light.

[0044] Fifth, in the drawings of the present application, for the convenience of explanation, the shapes of the optical elements shown in the drawings are shown by way of example, and the drawings are only examples and are not drawn strictly according to scale.

[0045] 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.

[0046] In a 3D stereoscopic display system, at least two 2D offset images are used and displayed to the left eye and the right eye respectively. The 2D offset images of the left eye and the right eye are combined by the viewer's brain, so that the viewer can perceive 3D depth. In order to enrich the viewer's 3D experience, it is usually necessary to increase the number of 2D offset images displayed. If different pixels of an image source are used to generate multiple different 2D offset images, the resolution of each 2D offset image will be reduced, thereby affecting the resolution of the 3D display. If multiple image sources are used to generate multiple different 2D offset images, not only will the volume of the 3D display system increase, but the cost of the 3D display system will also be too high. In addition, there are some solutions for watching 3D images by wearing 3D glasses, but such solutions are not suitable for use in head up display (HUD) systems.

[0047] In view of this, the present application proposes an image source and a display device that can not only provide 2D display, but also be applied to 3D display systems, such as HUD systems. The image source and display device provided by the present application can achieve a 3D stereoscopic display effect through a single image source, and the observer does not need to wear any special glasses to see the stereoscopic 3D image. At the same time, the 2D image used for 3D imaging has the full resolution of the image source, so the display device provided by the present application also has a high-resolution display effect. In addition, the present application scheme can accurately control the views of the left eye and the right eye through polarization selection, reduce the crosstalk between the views of the left eye and the right eye, and achieve the effect of improving the display quality.

[0048] Figure 1 A schematic diagram of an application scenario of the HUD device provided in an embodiment of the present application. Figure 1 As 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.

[0049] Among them, the virtual images corresponding to the navigation information and the indication information of external objects 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 of the virtual image of the navigation information 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.

[0050] It should be noted that the HUD device applicable to the embodiment of the present application can be a HUD device in a single-focal-plane application scenario, or a dual-focal-plane display device, etc. In addition, the HUD device applicable to the present application solution can be applied not only to vehicles, but also to driving tools such as ships, airplanes, helicopters, and trains, and the present application does not limit this.

[0051] In addition, it should be noted that the display device provided in the embodiment of the present application can be applied not only to Figure 1 The HUD device shown can also be applied to other display devices. Figure 1 This is only one application scenario of the display device provided in the embodiment of the present application, and is not the only application scenario.

[0052] Figure 2 The structure diagram of an image source 200 provided in an embodiment of the present application is shown in FIG. It can be understood that the image source 200 can be applied to the above Figure 1 In the HUD device shown. Figure 2 As shown, the image source 200 includes a picture generation unit (PGU) 201 and a polarization modulator 202. The PGU 201 is used to emit a first image light at a first moment and emit a second image light at a second moment. The first image corresponding to the first image light and the second image corresponding to the second image light are two adjacent frames of images. The polarization modulator 202 is used to generate a third image light of a first polarization direction based on the first image light at the first moment, or to generate a fourth image light of a second polarization direction based on the second image light at the second moment. The first polarization direction and the second polarization direction are orthogonal directions. The third image light is used to generate the first image, and the fourth image light is used to generate the second image.

[0053] It should be noted that, in the present application, the first moment can be understood as the moment when PGU 201 generates the first image, that is, the moment when PGU 201 emits the first image light. The second moment is the moment when PGU 201 generates the second image, that is, the moment when PGU 201 emits the second image light. The first image and the second image are two adjacent frames of images, therefore, the first moment and the second moment can also be understood as the moment when PGU 201 generates two adjacent frames of images, or can be understood as the moment when PGU 201 emits the image light corresponding to the two adjacent frames of images.

[0054] In the present application, the first image light and the second image light emitted by PGU 201 may be polarized light or unpolarized light. It is understandable that when the first image light and the second image light are polarized light, the first image light and the second image light are polarized light with the same polarization direction. For example, when the first image light and the second image light are linearly polarized light, the first image light and the second image light are both p-polarized light or s-polarized light. In this case, PGU 201 is a PGU that emits linearly polarized light. For another example, when the first image light and the second image light are circularly polarized light, the first image light and the second image light are both left-handed circularly polarized light or right-handed circularly polarized light. In this case, PGU 201 is a PGU that emits circularly polarized light.

[0055] The third image light and the fourth image light are polarized lights with polarization directions orthogonal to each other. In some embodiments, the third image light and the fourth image light may be linearly polarized lights, and exemplarily, the third image light is p-polarized light, and the fourth image light is s-polarized light. Alternatively, the third image light is s-polarized light, and the fourth image light is p-polarized light. In other embodiments, the third image light and the fourth image light may be circularly polarized lights, and exemplarily, the third image light is left-handed circularly polarized light, and the fourth image light is right-handed circularly polarized light. Alternatively, the third image light is right-handed circularly polarized light, and the fourth image light is left-handed circularly polarized light. It is understood that when the first image light and the second image light are polarized lights, the polarization directions of the first image light and the second image light may be the same as the polarization direction of the third image light, or may be the same as the polarization direction of the fourth image light. Exemplarily, when the third image light is p-polarized light and the fourth image light is s-polarized light, the first image light and the second image light may be p-polarized light, or s-polarized light. It can also be understood that the present application does not limit the first polarization direction and the second polarization direction. According to the above examples, if the third image light and the fourth image light are linearly polarized light, the first polarization direction can be the p-light polarization direction (corresponding to the second polarization direction as the s-light polarization direction), or the s-light polarization direction (corresponding to the second polarization direction as the p-light polarization direction). If the third image light and the fourth image light are circularly polarized light, the first polarization direction can be the left-handed circular polarization direction (corresponding to the second polarization direction as the right-handed circular polarization direction), or the right-handed circular polarization direction (corresponding to the second polarization direction as the left-handed circular polarization direction).

[0056] It should be noted that, in the present application, the PGU 201 and the polarization modulator 202 work in a synchronous state, that is, when the PGU 201 emits the first image light, the polarization modulator 202 is used to change the polarization direction of the incident light to the first polarization direction, that is, to generate the output light of the first polarization direction. When the PGU 201 emits the second image light, the polarization modulator 202 is used to change the polarization direction of the incident light to the second polarization direction, that is, to generate the output light of the second polarization direction. In other words, the image source 200 generates the first image corresponding to the polarization modulator 202 generating the output light of the first polarization direction, and the image source 200 generates the second image corresponding to the polarization modulator 202 generating the output light of the second polarization direction. In one achievable method, the processing module of the PGU 201 can be synchronized with the processing module of the polarization modulator 202, and an electrical signal can be sent to the polarization modulator 202 through an electrical connection to ensure synchronous operation. Exemplarily, when PGU 201 generates a first image, the processing module of PGU 201 sends an electrical signal instructing the processing module of polarization modulator 202 to generate the first image, and polarization modulator 202 converts the polarization modulator 202 to generate an output light of the first polarization direction according to the received electrical signal. Exemplarily, if the first polarization direction is the direction of p-polarized light and the second polarization direction is the direction of s-polarized light, when PGU 201 emits the first image light, polarization modulator 202 generates p-polarized light based on the first image light, and when PGU 201 emits the second image light, polarization modulator 202 generates s-polarized light based on the second image light.

[0057] Optionally, PGU 201 and polarization modulator 202 are integrated in the same module. In this case, the module can be understood as a new PGU capable of generating two mutually orthogonal polarized image lights, that is, two adjacent frames of images generated by the new PGU are carried on light beams with mutually orthogonal polarization directions, that is, the new PGU alternately emits two image lights with orthogonal polarization directions.

[0058] In the present application, the working principle of the polarization modulator 202 may be to control the polarization state of the optical carrier by an electrical signal, thereby realizing modulation of the optical signal. The present application does not limit the scheme for realizing modulation by the polarization modulator 202. For example, the polarization modulator 202 may change the polarization direction of the incident light by using the Pockels effect, or realize the transformation of the polarization state of the light beam by using the electro-optical effect of the liquid crystal material.

[0059] It should be noted that, in the present application, the first image and the second image may be the same or different.

[0060] In one achievable manner, when the first image light and the second image light are the same, that is, the image information carried by the first image light is the same as the image information carried by the second image light (and also the image information carried by the third image light and the image information carried by the fourth image light are the same), the image source 200 is used to generate two identical images. In some embodiments, when the image source 200 is applied to a HUD device, the first image and the second image may be the images seen by the left eye and the right eye of the driver, respectively, wherein there is a depth offset between the first image and the second image, and the same image seen by the left eye and the right eye of the driver is located in different focal planes. At this time, the image source 200 is used to provide the driver with a 3D HUD image, such as navigation information of a vehicle, including but not limited to direction arrows, distance and other information. As an example, in Figure 3 In the display area 302 of the windshield 301 shown, the first image 303 and the second image 304 can be the same images at different depths seen by the driver's left eye and right eye respectively. At this time, the driver presents a single 3D image with depth information in his brain through the first image 303 and the second image 304. In other embodiments, when the image source 200 is applied to other vehicle-mounted display devices, the first image and the second image can be the images seen by the passenger's left eye and right eye respectively. At this time, the image source 200 is used to provide 3D images to the passenger, such as entertainment information, including but not limited to 3D video animations, etc. For example, in Figure 3 In the display area 302 of the windshield 301 shown in the figure, the first image 303 and the second image 304 can be the same images at different depths seen by the left eye and the right eye of the passenger, respectively. At this time, the passenger presents a single 3D image with depth information in the brain through the first image 303 and the second image 304. In some other embodiments, when the image source 200 is applied to other vehicle-mounted display devices, the first image and the second image can also be the image seen by the driver's eyes and the image seen by the passenger's eyes, respectively. In this case, the image source 200 is used to provide the same 2D image to the driver and the passenger, respectively. As an example, in Figure 3 In the display area 302 of the windshield 301 shown, the first image 303 is the image seen by both eyes of the driver, the second image 304 is the image seen by both eyes of the passenger, and the first image 303 and the second image 304 are the same.

[0061] In another achievable manner, when the first image light and the second image light are different, that is, the image information carried by the first image light is different from the image information carried by the second image light (and the image information carried by the third image light is different from the image information carried by the fourth image light), the image source 200 is used to generate two different images. In some embodiments, if the image source 200 is applied to a HUD device, the first image and the second image can be the images seen by the left eye and the right eye of the driver, respectively. In this case, the image source 200 is used to provide a 3D HUD image to the driver. Exemplarily, in Figure 3 In the display area 302 of the windshield 301 shown, the first image 303 and the second image 304 can be different images seen by the left eye and the right eye of the driver, respectively. In this case, the driver presents different images at different depths in his brain through the first image 303 and the second image 304. In other embodiments, if the image source 200 is applied to other vehicle-mounted display devices, the first image and the second image can be different images seen by the left eye and the right eye of the passenger, respectively. In this case, the image source 200 is used to provide 3D images to the passenger. For example, in Figure 3 In the display area 302 of the windshield 301 shown in the figure, the first image 303 and the second image 304 may be different images seen by the left eye and the right eye of the passenger, respectively. In this case, the passenger presents different images at different depths in his brain through the first image 303 and the second image 304. In some other embodiments, the first image and the second image may be images seen by both eyes of the driver and the eyes of the passenger, respectively. In this case, the image source 200 is used to provide different 2D images to the driver and the passenger, respectively. Figure 3 In the display area 302 of the windshield 301 shown, the first image 303 is the image seen by both eyes of the driver, and the second image 304 is the image seen by both eyes of the passenger, and the first image 303 and the second image 304 are different.

[0062] The present application scheme does not limit the imaging technology of PGU 201. For example, PGU 201 can adopt liquid crystal display (LCD), liquid crystal on silicon (LCOS), organic light-emitting diode (OLED), micro-light-emitting diode (Micro-LED), mini-light-emitting diode (miniLED), digital light processing (DLP) or micro-electro-mechanical systems (MEMS) and other technologies. Figure 4FIG. 2 is a schematic diagram of a PGU 201 applicable to an embodiment of the present application. Figure 4 As shown, PGU 201 includes a light source 410, a modulation unit 420 and a projection lens 430. The light source 410 is used to provide a light beam carrying image information. The modulation unit 420 is used to modulate the light beam emitted by the light source 410 according to the image information, so that the light output from the modulation unit 420 carries the image information, that is, the light output from the modulation unit 420 is image light (for example, the first image light or the second image light). The projection lens 430 is used to emit image light carrying image information. It can be understood that for different imaging technologies adopted by PGU 201, Figure 4 The light source 410, the modulation unit 420 and the projection lens 430 in the PGU 201 can use components corresponding to different imaging technologies. For example, when the PGU 201 uses LCD imaging technology, the light source 410 can use an LED light source. When the PGU 201 uses MEMS imaging technology, the light source 410 can use a laser light source. It can also be understood that Figure 4 This is only one of the structures of the PGU 201 applicable to the embodiment of the present application, that is, the PGU 201 applicable to the embodiment of the present application is not limited to Figure 4 As shown, in some other embodiments, the PGU 201 applicable to the embodiment of the present application may also include a collimation module, a homogenization module, etc., which is not limited in the present application.

[0063] Optionally, the image source 200 further includes a diffuser screen 203. In some embodiments, the diffuser screen 203 is located between the PGU 201 and the polarization modulator 202. Figure 2 As shown in (a) in the figure. Specifically, the diffuser screen 203 is used to diffuse the first image light received at the first moment to generate diffused first image light, and emit the diffused first image light to the polarization modulator 202, and generate a relay image of the first image based on the first image light received at the first moment. Alternatively, the diffuser screen 203 is used to diffuse the second image light received at the second moment to generate diffused second image light, and emit the diffused second image light to the polarization modulator 202, and generate a relay image of the second image based on the second image light. It can be understood that when the diffuser screen 203 is located between the PGU 201 and the polarization modulator 202, the polarization modulator 202 modulates the diffused first image light to generate the third image light, or modulates the diffused second image light to generate the fourth image light. In other embodiments, the diffuser screen 203 is located in the light emitting direction of the polarization modulator 202, that is, when arranged along the transmission direction of the third image light or the fourth image light, the diffuser screen 203 is located behind the polarization modulator 202, such as Figure 2Specifically, the diffusion screen 203 is used to diffuse the third image light received from the polarization modulator 202 at the first moment to generate diffused third image light, and to generate a relay image of the first image based on the third image light; or, the diffusion screen 203 is used to diffuse the fourth image light received from the polarization modulator 202 at the second moment to generate diffused fourth image light, and to generate a relay image of the second image based on the fourth image light.

[0064] It can be understood that when the first image light and the second image light are polarized light, Figure 2 In the image source structure shown in (a), the diffuser 203 is a polarization-maintaining diffuser, for example, a diffuser having a surface designed as a microlens array. Figure 2 In the image source structure shown in (b) of FIG. 1 , the third image light and the fourth image light are polarized lights generated by the polarization modulator 202, so the diffusion screen 203 is a polarization-maintaining diffusion screen. When the first image light and the second image light are non-polarized lights, Figure 2 In the image source structure shown in (a) of FIG. 1 , the diffuser 203 may be a polarization-maintaining diffuser or a depolarizing diffuser. The depolarizing diffuser may be, for example, a diffuse scattering diffuser with a roughened surface. Figure 2 In the image source structure shown in (b) of FIG. 1 , the diffuser 203 is still a polarization-maintaining diffuser. It can also be understood that since the diffuser 203 does not have the function of changing the polarization direction of the light, Figure 2 In the image source structure shown in (a), the diffused first image light and the diffused second image light respectively maintain the polarization directions of the first image light and the second image light, that is, the polarization directions of the diffused first image light and the diffused second image light are the same. Figure 2 In the image source structure shown in (b), the polarization direction of the diffused third image light is the same as that of the third image light, and the polarization direction of the diffused fourth image light is the same as that of the fourth image light, that is, the polarization direction of the diffused third image light is orthogonal to the polarization direction of the diffused fourth image light.

[0065] It should be noted that in the image source 200 provided in the present application, since the polarization modulator 202 is introduced after the PGU 201, the polarization direction of the first image light and the second image light is changed by the polarization modulator 202. Therefore, the image source 200 can be used in combination with a filter module with polarization selection, so as to generate a 2D view of the 3D image based on only one of the first image light and the second image light. At this time, when the PGU 201 generates two adjacent frames of images, all pixels can be used to generate the first image and the second image, without using only part of the pixels to provide 2D views with different offsets, thereby ensuring high resolution of the 3D display. In addition, when the image source 200 provided in the present application is applied to a display device, not only can a 2D image display be realized through a single image source 200, but also, since the polarization modulator 202 and the PGU 201 are in a synchronous working state, the polarization modulator 202 can quickly switch between orthogonal polarizations, so that the left and right eyes of the viewer can simultaneously view the left and right images, thereby bringing a 3D viewing experience.

[0066] based on Figure 2 The image source 200 shown, Figure 5 Schematic diagram of the structure of the first display device 500 provided in the embodiment of the present application. Figure 5 As shown, the display device 500 includes an image source 200, a first polarization filter 510, and a second polarization filter 520. The polarization direction of the first polarization filter 510 is a first polarization direction, that is, it can transmit image light in the first polarization direction. The polarization direction of the second polarization filter 520 is a second polarization direction, that is, it can transmit image light in the second polarization direction. Specifically, when the image source 200 includes a diffusion screen and adopts Figure 2 In (a), the image source 200 is used to emit the third image light to the first polarization filter 510 and the second polarization filter 520 at a first moment, or to emit the fourth image light to the first polarization filter 510 and the second polarization filter 520 at a second moment. In this case, the first polarization filter 510 is used to transmit the third image light. The second polarization filter 520 is used to transmit the fourth image light. When the image source 200 includes a diffusion screen and adopts Figure 2 In (b), the image source 200 is used to emit the diffused third image light to the first polarization filter 510 and the second polarization filter 520 at a first moment, or to emit the diffused fourth image light to the first polarization filter 510 and the second polarization filter 520 at a second moment. At this time, the first polarization filter 510 is used to transmit the diffused third image light. The second polarization filter 520 is used to transmit the diffused fourth image light.

[0067] It can be understood that, since the polarization directions of the first polarization filter 510 and the second polarization filter 520 are orthogonal, when receiving the image light from the image source 200, only half of the image light can pass through the first polarization filter 510 or the second polarization filter 520, that is, the polarization filter with the same polarization direction as the incident image light can allow a part of the incident image light to pass, while the other part of the image light is blocked by the polarization filter with the polarization direction orthogonal to the incident image light. In other words, the present application scheme achieves the separation of the image light for generating the first image and the image light for generating the second image through two polarization filters with orthogonal polarization directions. Therefore, when the display device 500 provided by the present application is applied to a 3D display system, it is possible to more accurately control the left-eye and right-eye stereoscopic views, reduce the crosstalk between the left and right-eye images, and achieve the effect of improving the display quality. Exemplarily, if the polarization direction of the first polarization filter 510 is the same as the direction of p-polarized light (i.e., used to transmit p-polarized light), the polarization direction of the second polarization filter 520 is the same as the direction of s-polarized light (i.e., used to transmit s-polarized light). Figure 5 As shown in (a) of FIG. 1 , when the third image light is p-polarized light and the fourth image light is s-polarized light (corresponding to the image source 200 using Figure 2 In (a) above, only a portion of the third image light emitted by the image source 200 that is incident on the first polarization filter 510 passes through the first polarization filter 510, while another portion of the third image light that is incident on the second polarization filter 520 is blocked. Similarly, only a portion of the fourth image light that is incident on the second polarization filter 520 passes through the second polarization filter 520, while another portion of the fourth image light that is incident on the first polarization filter 510 is blocked. Figure 5 As shown in (b) in FIG. 1 , when the third image light after diffusion is p-polarized light and the fourth image light after diffusion is s-polarized light (corresponding to the image source 200 using Figure 2 In (b) of FIG. 5 ), only a portion of the diffused third image light emitted by the image source 200 passes through the first polarization filter 510, while no image light passes through the second polarization filter 520. Only a portion of the diffused fourth image light emitted by the image source 200 passes through the second polarization filter 520, while no image light passes through the first polarization filter 510.

[0068] It should be noted that, in the present application, the first polarization filter 510 and the second polarization filter 520 are located at the middle eye box or the middle eye box position, and at the same time, the first polarization filter 510 and the second polarization filter 520 are arranged to occupy the left half and the right half of the middle eye box respectively. The middle eye box or the middle eye box is a position optically conjugate with the user eye box (or the system eye box of the display system). Among them, the user eye box area can be understood as the range in which the user's eyes can move when viewing the image displayed by the display system. In other words, the viewer can view the image displayed by the display system at any position in the user eye box area, and cannot view the image displayed by the display system at a position outside the user eye box area. It can be understood that when the middle eye box and the user eye box are mutually conjugated optical planes, the middle eye box can be understood as the user eye box. Therefore, when the first polarization filter 510 and the second polarization filter 520 with polarization selectivity are arranged at the middle eye box position, it is possible to avoid setting a polarization element at the user eye box position, that is, when the display device 500 is used in a 3D display system, the user eye box position may not need to be provided with a special polarization element, such as for the viewer to wear special 3D glasses. In other words, the display device 500 provided in the present application helps to realize an automatic stereoscopic image display system, and can be applied to more display scenarios, thereby providing a more comfortable user experience for the viewer.

[0069] It can be understood that the above-mentioned intermediate eye box or intermediate eye box is only an exemplary name and does not limit the protection scope of the present application. It can also be called a conjugate eye box, an equivalent user eye box, etc., which is not limited in the present application.

[0070] Optionally, the display device 500 further includes a polarization conversion element 530. Specifically, when the polarization conversion element 530 is located in the light-emitting direction of the first polarization filter 510, the polarization conversion element 530 is used to convert the polarization direction of the image light (the third image light or the third image light after diffusion) from the first polarization filter 510 into the second polarization direction. When the polarization conversion element 530 is located in the light-emitting direction of the second polarization filter 520, the polarization conversion element 530 is used to convert the polarization direction of the image light (the fourth image light or the fourth image light after diffusion) from the second polarization filter 520 into the first polarization direction. It can be understood that in Figure 5 In (a) and (b), the polarization conversion element 530 is used as an example to change the image light emitted by the first polarization filter 510. In some embodiments, the polarization conversion element 530 is a half-wave plate (also called a half-wave plate). Figure 5As shown, when the image light of the first polarization filter 510 is p-polarized light, the third image light or the diffused third image light can be converted from p-polarized light to s-polarized light through a half-wave plate. It can be understood that for the HUD display system, the windshield is usually s-polarized, that is, imaging is performed by s-polarized light. Therefore, by introducing a polarization conversion element 530, such as a 1 / 2 wave plate, into the display device 500, when the image light emitted by the display device is p-polarized light, the p-polarized light can be converted into s-polarized light that is more conducive to imaging of the HUD display system, thereby achieving the purpose of improving the display quality.

[0071] When the display device 500 is applied to a HUD display system in a vehicle, Figure 6 Schematic diagram of the optical path 1000 of the display device 500 provided in the embodiment of the present application applied to the HUD display system. It should be noted that in the optical path 1000, the structure of the display device 500 is based on Figure 5 (a) is shown as an example. Specifically, for the first image viewed by the human eye, the image source 200 emits a third image light to the first reflective element 21 at a first moment, and the third image light is reflected by the first reflective element 21, the first polarization filter 510, and the second reflective element 23 in sequence to the windshield 1001, and is reflected by the windshield 1001 into the human eye, such as the left eye, so that the human eye views the first image. Similarly, for the second image viewed by the human eye, the image source 200 emits a fourth image light to the first reflective element 21 at a second moment, and the fourth image light is reflected by the first reflective element 21, the second polarization filter 520, and the second reflective element 23 in sequence to the windshield 1001, and is reflected by the windshield 1001 into the human eye, such as the right eye, so that the human eye views the second image.

[0072] In order to prevent external pollutants from entering the display device 500 and causing a deterioration in the display effect, or to reduce glare in the light path 1000 , the light path 1000 optionally also includes a dust cover 1002 , which is located on the light path between the second reflective element 23 and the windshield 1001 .

[0073] exist Figure 6 In the optical path 1000 shown, the first reflecting element 21 and the second reflecting element 23 may be concave free-form surface reflecting mirrors or convex free-form surface reflecting mirrors, etc., which is not limited in the present application.

[0074] Understandably, Figure 6 This application only provides an example of the optical path of a HUD display system in a vehicle, that is, the HUD optical path of the vehicle to which the display device protected by this application is applied is not limited to Figure 6In some other embodiments, the HUD optical path may include only one reflective element, or the optical path of the vehicle may also include other reflective flat plates and other optical elements for reducing the volume of the optical path, etc., which is not limited in this application.

[0075] It can also be understood that the means of transportation to which the present application scheme can be applied include but are not limited to cars, airplanes, trains or ships, etc.

[0076] Figure 7 FIG. 7 is a schematic structural diagram of a second display device 700 provided in an embodiment of the present application. Figure 7 As shown, the display device 700 includes a PGU 701, a polarization beam splitter 703, a first polarization modulator 7041, a second polarization modulator 7042 and a first reflective element 705. Among them, the first polarization modulator 7041 and the second polarization modulator 7042 are located at a position optically conjugate with the user's eye box. Specifically, the PGU 701 is used to emit a first image light at a first moment and emit a second image light at a second moment, and the first image corresponding to the first image light and the second image corresponding to the second image light are two adjacent frames of images. The polarization beam splitter 703 is used to transmit the image light of the first polarization direction and reflect the image light of the second polarization direction. The first polarization modulator 7041 is used to generate a third image light of the first polarization direction based on the first image light, or, to generate a fourth image light of the second polarization direction based on the second image light. The second polarization modulator 7042 is used to generate a fifth image light of the second polarization direction based on the first image light, or, to generate a sixth image light of the first polarization direction based on the second image light. The first reflective element 705 is used to reflect the third image light and the fifth image light to the polarization beam splitter 703 at the first moment, or to reflect the fourth image light and the sixth image light to the polarization beam splitter 703 at the second moment.

[0077] The working principles of the first polarization modulator 7041 and the second polarization modulator 7042 can refer to the above Figure 2 The description of the polarization modulator 202 is not repeated here. Figure 7In the display device 700 shown, the first polarization modulator 7041 and the second polarization modulator 7042 generate polarized light with polarization directions orthogonal to each other at the same time. That is, for the first image light emitted at the first time, the polarization directions of the third image light and the fifth image light generated by the first polarization modulator 7041 and the second polarization modulator 7042 based on the first image light are orthogonal to each other; for the second image light emitted at the second time, the polarization directions of the fourth image light and the sixth image light generated by the first polarization modulator 7041 and the second polarization modulator 7042 based on the first image light are orthogonal. Therefore, when the first polarization modulator 7041 and the second polarization modulator 7042 are used together with the polarization beam splitter 703, it can be achieved that only the image light of the second polarization direction emitted from the second polarization modulator 7042 (for example, the fifth image light emitted from the second polarization modulator 7042) can be reflected by the polarization beam splitter 703 to generate the first image, and only the image light of the second polarization direction emitted from the first polarization modulator 7041 (for example, the fourth image light emitted from the first polarization modulator 7041) can be reflected by the polarization beam splitter 703 to generate the second image. In other words, in Figure 7 In the display device 700 shown, the image light generated by the two polarization modulators and the polarization beam splitter with orthogonal polarization directions is selected to separate the image light for generating the first image and the image light for generating the second image. Therefore, when the display device 700 provided by the present invention is applied to a 3D display system, the left-eye and right-eye stereoscopic views can be controlled more accurately, and the crosstalk between the left-eye and right-eye images can be reduced, thereby achieving the effect of improving the display quality. For example, Figure 7Taking the example of when the first image light and the second image light are p-polarized lights, the first polarization modulator 7041 generates p-polarized light based on the first image light emitted at the first moment, and the second polarization modulator 7042 generates s-polarized light based on the first image light emitted at the first moment; the first polarization modulator 7041 generates s-polarized light based on the second image light emitted at the second moment, and the second polarization modulator 7042 generates p-polarized light based on the second image light emitted at the second moment, as an example, the display working principle of the display device 700 is explained. Specifically, at the first moment, PGU 701 emits p-polarized light, which transmits the polarization beam splitter 703, then transmits the first polarization modulator 7041, and is converted into s-polarized light by the second polarization modulator 7042. Subsequently, the p-polarized light emitted from the first polarization modulator 7041 and the s-polarized light emitted from the second polarization modulator 7042 are reflected by the first reflecting element 705, and then respectively emitted from the first polarization modulator 7041 and the second polarization modulator 7042 to the polarization beam splitter 703. The polarization beam splitter 703 reflects the s-polarized light emitted from the second polarization modulator 7042, and the s-polarized light is used to generate a first image. At the second moment, PGU 701 emits p-polarized light, which is converted into s-polarized light by the first polarization modulator 7041 after transmitting through the polarization beam splitter 703, and at the same time, is transmitted through the second polarization modulator 7042, and then the s-polarized light emitted from the first polarization modulator 7041 and the p-polarized light emitted from the second polarization modulator 7042 are reflected by the first reflective element 705, and then emitted from the first polarization modulator 7041 and the second polarization modulator 7042 to the polarization beam splitter 703 respectively, and the polarization beam splitter 703 reflects the s-polarized light emitted from the first polarization modulator 7041, and the s-polarized light is used to generate the second image. It can be understood that this description is only based on the example that the first image light and the second image light are p-polarized light, and does not limit the protection scope of the present application.

[0078] It is understandable that compared to Figure 5 The display device 500 shown in FIG. Figure 7 In the display device 700 shown, by setting the first polarization modulator 7041 and the second polarization modulator 7042 at the middle eye box position to occupy the left half and the right half of the middle eye box respectively, it is also possible to avoid setting a polarization element at the user eye box position. That is, when the display device 700 is used in a 3D display system, there is no need to set a special polarization element at the user eye box position, so that the display device 700 provided in the present application can be applied to more display scenarios, thereby providing a more comfortable user experience for the viewer.

[0079] Optionally, the display device 700 further includes a diffusion screen 702, and the diffusion screen 702 is located between the PGU 701 and the polarization beam splitter 703. It can be understood that when the first image light and the second image light are polarized light, the diffusion screen 702 is a polarization-maintaining diffusion screen. When the first image light and the second image light are non-polarized light, the diffusion screen 702 can be a polarization-maintaining diffusion screen or a depolarizing diffusion screen. Specifically, the diffusion screen 702 is used to diffuse the received first image light to generate diffused first image light, and emit the diffused first image light to the polarization beam splitter 703, and generate a relay image of the first image based on the received first image light. Alternatively, the diffusion screen 702 is used to diffuse the received second image light to generate diffused second image light, and emit the diffused second image light to the polarization beam splitter 703, and generate a relay image of the second image based on the second image light.

[0080] When the display device 700 is applied to a vehicle, Figure 8The display device 700 provided in the embodiment of the present application is applied to the optical path 2000 of a vehicle. Exemplarily, the polarization beam splitter 703 is used to transmit the image light of the first polarization direction and reflect the image light of the second polarization direction. The first image light and the second image light are image lights of the first polarization direction, and the first polarization modulator 7041 generates the image light of the first polarization direction based on the first image light emitted from the PGU 701 at the first moment, and the second polarization modulator 7042 generates the image light of the second polarization direction based on the first image light emitted from the PGU 701 at the first moment. The first polarization modulator 7041 generates the image light of the second polarization direction based on the second image light emitted from the PGU 701 at the second moment, and the second polarization modulator 7042 generates the image light of the first polarization direction based on the second image light emitted from the PGU 701 at the second moment. Specifically, for the first image viewed by the human eye, the PGU 701 emits the first image light to the diffuser screen 702 at the first moment, and the first image light generates the diffused first image light after passing through the diffuser screen 702 and emits it to the polarization beam splitter 703. The polarization beam splitter 703 transmits the diffused first image light to the first polarization modulator 7041 and the second polarization modulator 7042, and generates the third image light of the first polarization direction through the first polarization modulator 7041, and generates the fifth image light of the second polarization direction through the second polarization modulator 7042. After the third image light and the fifth image light are reflected by the first reflective element 705, they are reflected again by the second reflective element 31 to the polarization beam splitter 703. The polarization beam splitter 703 continues to reflect the fifth image light of the second polarization direction to the third reflective element 32, and the fifth image light is reflected by the third reflective element 32 and the fourth reflective element 33 in turn to the windshield 2003, and is reflected by the windshield 2003 into the human eye, for example, the left eye, so that the human eye sees the first image. Similarly, for the second image seen by the human eye, the PGU 701 emits the second image light to the diffuser 702 at the second moment, and the second image light generates the diffused second image light after passing through the diffuser 702 and is emitted to the polarization beam splitter 703. The polarization beam splitter 703 transmits the diffused second image light to the first polarization modulator 7041 and the second polarization modulator 7042, and generates the fourth image light of the second polarization direction through the first polarization modulator 7041, and generates the sixth image light of the first polarization direction through the second polarization modulator 7042. After the fourth image light and the sixth image light are reflected by the first reflective element 705, they are reflected again by the second reflective element 31 to the polarization beam splitter 703. The polarization beam splitter 703 continues to reflect the fourth image light of the second polarization direction to the third reflective element 32, and the fourth image light is reflected by the third reflective element 32 and the fourth reflective element 33 in sequence to the windshield 2003, and is reflected by the windshield 2003 into the human eye, for example, the right eye, so that the human eye sees the second image.

[0081] Similarly, in order to prevent external pollutants from entering the display device 700 and causing a deterioration in the display effect, or to reduce glare in the light path 2000, the light path 2000 optionally also includes a dust cover 2002, which is located on the light path between the fourth reflective element 33 and the windshield 2003.

[0082] exist Figure 8 In the optical path 2000 shown, the second reflecting element 31, the third reflecting element 32 and the fourth reflecting element 33 can be concave free-form surface reflecting mirrors or convex free-form surface reflecting mirrors, etc., which is not limited in the present application.

[0083] Understandably, Figure 8 This application only provides an example of a light path of a vehicle, that is, the light path of the vehicle to which the display device protected by this application is applied is not limited to Figure 8 In some other embodiments, the optical path of the vehicle may further include other optical elements such as other reflective plates for reducing the volume of the optical path.

[0084] It can also be understood that the means of transportation to which the present application scheme can be applied include but are not limited to cars, airplanes, trains or ships, etc.

[0085] Fig. 9 This is a circuit diagram of a display device provided in an embodiment of the present application. Fig. 9 The display device shown may be the display device 500 or the display device 700 provided by the present application. Fig. 9 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.).

[0090] 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.

[0091] 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.

[0092] The display device can implement audio functions such as music playing and calls through the audio module 1204 and the application processor.

[0093] 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.

[0094] 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.

[0095] The video module 1205 can decode the video input by the video interface 1209, for example, by performing H.264 decoding. The video module 1205 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.

[0096] 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 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 the image light. In addition, the main processor 1201 can also output one or more image signals to the display circuit 1210.

[0097] In this embodiment, the display circuit 1210 may be referred to as a driving circuit.

[0098] The power module 1206 is used to provide power to the main processor 1201 and the light source 1200 according to the input power (such as 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 1212 for imaging, thereby forming an image light signal.

[0099] 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.

[0100] 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.

[0101] The above display device can be installed on a vehicle, see Fig.10 , Fig.10 A schematic diagram of a possible functional framework of a vehicle provided in an embodiment of the present application.

[0102] like Fig.10As 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.

[0103] Among them, 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 used for automatic detection, etc., and this application does not limit them.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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 memory. 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 can call 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 may call 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.

[0110] 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.

[0111] 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 realized by other subsystems of the vehicle. For example, the controller can also be a component in the control system.

[0112] Among them, this application Fig.10 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.

[0113] 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.

[0114] Fig.11 A schematic functional block diagram of a mobile carrier 25 provided in an embodiment of the present application. The mobile carrier 25 may include a perception system 120, a display device 130, and a computing platform 150, wherein the perception system 120 may include one or more sensors for sensing information about the environment around the mobile carrier 25. For example, the perception system 120 may include a positioning system, and the positioning system may be a global positioning system (GPS), or a Beidou system or other positioning systems, an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera device. One or more.

[0115] Some or all functions of the mobile carrier 25 may be controlled by the computing platform 150. The computing platform 150 may include one or more processors, such as processor 151, processors 152 to 15n (n is a positive integer). The processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and execution capability, such as a CPU, a microprocessor, a GPU (which can be understood as a microprocessor), or a DSP, etc.; in another implementation, the processor may implement certain functions through the logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as a field programmable gate array (FPGA). In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc. In addition, the computing platform 150 can also include a memory, the memory is used to store instructions, and some or all of the processors 151 to 15n can call the instructions in the memory and execute the instructions to achieve the corresponding functions. Among them, the display device 130 in the cockpit is a display device suitable for the embodiment of the present application, such as the display device 500 in the above embodiment.

[0116] The mobile carrier in the present application may include road vehicles, water vehicles, air vehicles or entertainment equipment, etc. For example, the mobile carrier may be a vehicle, which is a vehicle in a broad sense, and may be a vehicle (such as a commercial vehicle, a passenger car, a train, etc.), an amusement device, a toy vehicle, etc. The embodiment of the present application does not specifically limit the type of vehicle. For another example, the mobile carrier may be a vehicle such as an airplane or a ship.

[0117] 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.

[0118] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display device, characterized in that: It includes an image generating unit, a polarization modulation module and a filtering module, wherein the polarization modulation module or the filtering module is located at a position optically conjugate with the user's eye box, wherein: The image generating unit is configured to emit a first image light at a first moment and emit a second image light at a second moment, wherein a first image corresponding to the first image light and a second image corresponding to the second image light are two adjacent frames of images; The polarization modulation module is used to generate at least one polarized image light based on the first image light or the second image light, and emit the at least one polarized image light to the filtering module; The filtering module is used to select and emit a first polarized image light, where the first polarized image light is used to generate the first image or the second image, and the first polarized image light is one of the at least one polarized image light.

2. The display device according to claim 1, characterized in that The polarization modulation module comprises a first polarization modulator, The first polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image, the first polarization direction and the second polarization direction are orthogonal, the third image light is used to generate the first image, and the fourth image light is used to generate the second image.

3. The display device according to claim 2, characterized in that: The filtering module is located at a position optically conjugate with the user's eye box, and the filtering module includes a first polarization filter and a second polarization filter, the polarization direction of the first polarization filter is the first polarization direction, and the polarization direction of the second polarization filter is the second polarization direction, wherein, The first polarization filter is used to transmit the third image light; The second polarization filter is used to transmit the fourth image light.

4. The display device according to claim 3, characterized in that: The display device further includes a polarization conversion element, The polarization conversion element is located in the light exiting direction of the first polarization filter, and the polarization conversion element is used to convert the polarization direction of the third image light into the second polarization direction; or, The polarization conversion element is located in the light exiting direction of the second polarization filter, and the polarization conversion element is used to convert the polarization direction of the fourth image light into the first polarization direction.

5. The display device according to claim 4, characterized in that: The polarization conversion element is a half-wave plate.

6. The display device according to claim 1, characterized in that: The polarization modulation module is located at a position optically conjugate with the user's eye box, the polarization modulation module includes a first polarization modulator and a second polarization modulator, and the display device also includes a first reflective element. The first polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image light; The second polarization modulator is used to generate a fifth image light of a second polarization direction based on the first image light, or to generate a sixth image light of a first polarization direction based on the second image light; The first reflecting element is used to reflect the third image light and the fifth image light to the filtering module, or to reflect the fourth image light and the sixth image light to the filtering module.

7. The display device according to claim 6, characterized in that: The filtering module includes a polarization beam splitter, wherein: The polarization beam splitter is used to transmit the image light in the first polarization direction and reflect the image light in the second polarization direction.

8. The display device according to any one of claims 1 to 7, characterized in that: The display device further comprises a diffusion screen, wherein the diffusion screen is located between the image generation unit and the polarization modulation module. The diffusion screen is used to diffuse the first image light to generate diffused first image light, and to generate a relay image of the first image based on the first image light, or to diffuse the second image light to generate diffused second image light, and to generate a relay image of the second image based on the second image light.

9. The display device according to claim 2, characterized in that: The display device further includes a diffusion screen, wherein the diffusion screen is located between the first polarization modulator and the filter module, and the diffusion screen, for diffusing the third image light to generate diffused third image light, and generating a relay image of the first image based on the third image light; or, The method is used for diffusing the fourth image light to generate diffused fourth image light, and for generating a relay image of the second image based on the fourth image light.

10. The display device according to claim 9, characterized in that: The filtering module is located at a position optically conjugate with the user's eye box, and the filtering module includes a first polarization filter and a second polarization filter, the polarization direction of the first polarization filter is the first polarization direction, and the polarization direction of the second polarization filter is the second polarization direction, wherein, The first polarization filter is used to transmit the diffused third image light; The second polarization filter is used to transmit the diffused fourth image light.

11. An image source, characterized in that: include: An image generating unit and a polarization modulator, wherein The image generating unit is configured to emit a first image light at a first moment and emit a second image light at a second moment, wherein a first image corresponding to the first image light and a second image corresponding to the second image light are two adjacent frames of images; The polarization modulator is used to generate a third image light of a first polarization direction based on the first image light, or to generate a fourth image light of a second polarization direction based on the second image, the first polarization direction and the second polarization direction are orthogonal, the third image light is used to generate the first image, and the fourth image light is used to generate the second image.

12. The image source according to claim 11, characterized in that: The image source further includes a diffusion screen, which is located between the image generating unit and the polarization modulator. for diffusing the first image light to generate diffused first image light, emitting the diffused first image light to the polarization modulator, and generating a relay image of the first image based on the first image light; or, used for diffusing the second image light to generate diffused second image light, emitting the diffused second image light to the polarization modulator, and generating a relay image of the second image based on the second image light; The polarization modulator is specifically used to: modulate the diffused first image light to generate the third image light, or modulate the diffused second image light to generate the fourth image light.

13. The image source according to claim 11, characterized in that: The image source further includes a diffusion screen, and the diffusion screen is located in the light emitting direction of the polarization modulator. The polarization modulator is specifically used to: modulate the first image light to generate the third image light, or modulate the second image light to generate the fourth image light; The diffusion screen is used to diffuse the third image light to generate diffused third image light, and to generate a relay image of the first image based on the third image light; or, The method is used for diffusing the fourth image light to generate diffused fourth image light, and for generating a relay image of the second image based on the fourth image light.

14. The image source according to claim 11, characterized in that: The first image light and the second image light are image lights in a third polarization direction, and the third polarization direction is the same as the first polarization direction, or the third polarization direction is the same as the second polarization direction.

15. The image source according to claim 11, characterized in that: The image source is used to generate a two-dimensional 2D image, or the image source is used to generate a three-dimensional 3D image.

16. The image source according to any one of claims 11 to 15, characterized in that: The image generation unit and the polarization modulator are integrated in the same module.

17. A vehicle-mounted system, characterized in that: A display device comprising any one of claims 1 to 10.

18. A means of transport, characterized in that: The display device and the windshield according to any one of claims 1 to 10, or the vehicle-mounted system and the windshield according to claim 17, The windshield is used to reflect the image light emitted from the display device to human eyes.

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