Display device and vehicle

Abstract

A display device and a vehicle belong to the technical field of display. The display device includes an image generation unit, an optical path folding unit, and an imaging unit. The image generation unit is used for emitting image light. The light path folding unit is used for guiding the image light from the image generation unit to the imaging unit. The imaging unit is used for forming a virtual image based on the image light from the light path folding unit. Wherein the light path folding unit comprises a light path folding layer, inorganic glass and an organic plate which are sequentially stacked along an emergent light path of the imaging unit. The display device is high in safety performance in a collision scene.

Description

[0001] This application claims priority to Chinese Patent Application No. 202310122352.3, filed on February 1, 2023, entitled "Display Device and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and in particular to a display device and a vehicle. Background Technology

[0003] Display devices are being used more and more in people's daily lives.

[0004] In related technologies, display devices include an image generating unit, an optical path folding unit, and an imaging unit. The image generating unit emits image light, the optical path folding unit guides the image light to the imaging unit, and the imaging unit reflects the image light back to the optical path folding unit. The optical path folding unit typically includes an optical path folding layer and inorganic glass sequentially located on the outgoing light path of the imaging unit. The optical path folding layer is attached to the inorganic glass and is used to transmit at least a portion of the imaging light from the imaging unit to the human eye. Thus, the user can see a virtual image.

[0005] However, inorganic glass is prone to breakage in collision scenarios, posing a safety hazard. Utility Model Content

[0006] This application provides a display device and a vehicle that can improve the safety performance of the display device in collision scenarios.

[0007] On one hand, this application provides a display device. The display device includes an image generating unit, an optical path folding unit, and an imaging unit. The image generating unit emits image light. The optical path folding unit guides the image light from the image generating unit to the imaging unit. The imaging unit forms a virtual image based on the image light from the optical path folding unit. The optical path folding unit includes an optical path folding layer, inorganic glass, and an organic substrate, sequentially stacked along the emitted light path of the imaging unit.

[0008] When the display device is subjected to a collision, the organic sheet material placed on the outside of the inorganic glass can provide protection, improving the safety performance of the display device in collision scenarios. This display device is particularly suitable for automotive display applications.

[0009] To further enhance the user experience, the optical path folding assembly may also include an anti-reflection layer, which reduces the reflection of ambient light from the outer surface of the display device. This anti-reflection layer may include at least two polarization state conversion layers. By controlling the polarization state of ambient light incident on the optical path folding unit using these layers, the reflection of ambient light can be reduced, causing the display area to appear dark, such as black, when the display device is not in operation.

[0010] Since organic substrates delay the phase of light, in order to avoid the organic substrates from adversely affecting the effect of the antireflection layer, all polarization state conversion layers in the antireflection layer can be placed between the inorganic glass and the organic substrate.

[0011] Alternatively, the antireflection layer can adopt any of the following structures:

[0012] The first type of antireflection layer comprises a quarter-wave plate, a first linear polarizer, and a second linear polarizer, sequentially stacked along the outgoing light path of the imaging unit. The transmission axes of the first and second linear polarizers form an angle. By controlling the angle between the transmission axes of the first and second linear polarizers, the weakening effect of the antireflection layer on ambient light reflectivity can be controlled. Here, the combination of the quarter-wave plate and the first linear polarizer can be referred to as a circular polarizer.

[0013] The second type, the antireflection layer includes a quarter-wave plate and a first linear polarizer stacked sequentially along the outgoing light path of the imaging unit.

[0014] Optionally, the optical path folding layer can adopt any of the following structures: First, the optical path folding layer is a semi-transparent, semi-reflective film; second, the optical path folding layer includes a quarter-wave plate and a reflective polarizer sequentially stacked along the outgoing light path of the imaging unit; third, the optical path folding layer includes a quarter-wave plate, a reflective polarizer, and an absorptive polarizer sequentially stacked along the outgoing light path of the imaging unit, wherein the transmission axes of the reflective polarizer and the absorptive polarizer are in the same direction; fourth, the optical path folding layer includes a reflective polarizer, and the optical path folding unit further includes... A fifth type, wherein the optical path folding layer comprises a semi-transparent and semi-reflective film, a first quarter-wave plate, and an absorptive polarizer stacked sequentially along the outgoing optical path of the imaging unit, and the optical path folding unit further comprises a second quarter-wave plate located on the optical path between the imaging unit and the optical path folding layer; and a sixth type, wherein the optical path folding layer comprises a semi-transparent and semi-reflective film and an absorptive polarizer stacked sequentially along the outgoing optical path of the imaging unit, and the optical path folding unit further comprises a quarter-wave plate located on the optical path between the imaging unit and the optical path folding layer.

[0015] All six optical path folding layers can reflect at least a portion of the image light from the image generation unit to the imaging unit, and transmit at least a portion of the image light emitted from the imaging unit.

[0016] Optionally, the organic sheet can be a single-layer structure or a multi-layer composite structure. When the organic sheet is a single-layer structure, it can be an acrylic sheet, a polycarbonate sheet, or a polyvinyl chloride sheet. When the organic sheet is a multi-layer composite structure, the organic sheet includes at least two different types of sheets stacked together, and each layer can be an acrylic sheet, a polycarbonate sheet, or a polyvinyl chloride sheet.

[0017] Optionally, the light transmittance of the organic board is 50% to 100%. By selecting the appropriate light transmittance of the organic board as needed, the reflectivity of the display device's screen to ambient light can be controlled.

[0018] Alternatively, the organic board can be colorless or colored, such as brown or gray.

[0019] For example, the thickness of the organic board is 1mm to 2mm, for example, 1.2mm.

[0020] For example, the thickness of the inorganic glass is greater than or equal to 0.2 mm and less than 2 mm, such as 0.5 mm to 1 mm. The smaller thickness of the inorganic glass helps to reduce the weight of the display device.

[0021] Optionally, an optical adhesive layer is provided between the optical path folding layer and the inorganic glass, or the optical path folding layer is formed directly on the inorganic glass.

[0022] Optionally, an optical adhesive layer is provided between the inorganic glass and the organic substrate. For example, when the antireflective layer is located between the inorganic glass and the organic substrate, the organic substrate and the antireflective layer are bonded together with optical adhesive; or, the inorganic glass and the antireflective layer are bonded together with optical adhesive, thereby providing an optical adhesive layer between the inorganic glass and the organic substrate. As another example, when the optical path folding unit does not include an antireflective layer, the inorganic glass and the organic substrate can be bonded together with an optical adhesive layer.

[0023] Optionally, the light transmittance of the optical adhesive layer is 50% to 100%. By selecting a suitable light transmittance for the optical adhesive layer as needed, the reflectivity of the display device's screen to ambient light can be controlled.

[0024] Optionally, the optical path folding unit further includes an optical film located on the side of the organic substrate away from the inorganic glass, and the optical film includes at least one of the following: an anti-refletance (AR) film and an anti-glare film. This optical film can further reduce the reflection of ambient light by the optical folding unit, improving the user experience.

[0025] In some examples, the image generation unit includes a direct imaging image source or a projection imaging image source. Exemplarily, a direct imaging image source includes a liquid crystal display (LCD), an OLED display, or a light-emitting diode (LED) display, etc. A projection imaging image source includes an illumination source and a reflective spatial light modulator. The illumination source generates a light beam, and the reflective spatial light modulator modulates and reflects the light beam generated by the light source to obtain the image light. When the image generation unit includes a projection imaging image source, the image generation unit further includes a diffusion screen for transmitting the image light and forming a real image. Exemplarily, a reflective spatial light modulator includes a liquid crystal on silicon (LCoS) modulator or a micro-electro-mechanical system (MEMS) modulator, etc.

[0026] Optionally, the image generation unit may further include a polarization state conversion element, which is used to convert the image light generated by the image source into a target polarization state. This allows for arbitrary selection of the image source type as needed, making implementation more convenient.

[0027] Optionally, the image light emitted by the image generation unit is linearly polarized light, circularly polarized light, or elliptically polarized light.

[0028] In some examples, the imaging unit includes a curved reflector.

[0029] In some examples, the light-emitting surface of the image generation unit is opposite to the optical path folding unit. The image light emitted from the image generation unit is reflected by the optical path folding unit to the imaging unit, and then the imaging unit reflects the image light from the optical path folding unit back to the optical path folding unit, and finally exits from the optical path folding unit. This results in fewer reflections of the image light within the display device, which is beneficial for improving light efficiency.

[0030] In other examples, the light-emitting surface of the image generation unit is opposite to the imaging unit. The image light emitted from the image generation unit is reflected by the imaging unit to the optical path folding unit, then reflected by the optical path folding unit to the imaging unit, and then reflected again by the imaging unit to the optical path folding unit before exiting from the optical path folding unit. In this example, the image distortion is small during display, and the image quality of the virtual image is good.

[0031] Optionally, the display device further includes a housing. The housing has an observation window. Both the image generation unit and the imaging unit are located within the housing. The optical path folding unit is located at the observation window, and the organic panel is located on the outside of the housing. The housing can protect the various units and integrate them together to facilitate the overall movement of the display device.

[0032] Optionally, the display device further includes a main processor. The main processor is used to send image data to the image generation unit, and the image generation unit is used to provide image light based on the received image data.

[0033] In some examples, the display device also includes a power supply for powering the main processor and the image generation unit.

[0034] In some examples, the display device can be a desktop display device, such as a monitor and a television.

[0035] On the other hand, this application provides a display device. The structure of this display device is similar to that of the aforementioned display devices, but the inorganic glass is replaced with another organic substrate. This organic substrate has better optical properties and less phase retardation of light.

[0036] In another aspect, this application provides a means of transportation that includes any of the aforementioned display devices. The display device is mounted on the means of transportation. Exemplarily, the means of transportation includes, but is not limited to, automobiles, airplanes, trains, or ships. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the usage state of a display device provided in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the usage state of another display device provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram illustrating the usage state of another display device provided in the embodiments of this application;

[0040] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the structure of an optical path folding unit provided in an embodiment of this application;

[0042] Figure 6 This is a circuit diagram of the display device provided in the embodiments of this application;

[0043] Figure 7This is a functional schematic diagram of a means of transportation provided in an embodiment of this application. Detailed Implementation

[0044] The display device provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings. This display device can serve as a general-purpose display (e.g., Figure 1 (As shown in 100a) can be used for office work, and can also be used as a television (e.g.) Figure 2 As shown in 100b, it can be used for home entertainment (as a television) or for in-vehicle displays (e.g., Figure 3 As shown in 100c, the display device is mounted on the vehicle seat (or on the vehicle dashboard), or it can be made into a portable display device for more flexible application in various scenarios. The physical size, display size, and resolution of the display device can be adjusted according to the usage scenario. In this application, the display device can also be referred to as a virtual image display system or a display system.

[0045] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 4 As shown, the display device includes an image generation unit 110, an optical path folding unit 120, and an imaging unit 130. The image generation unit 110 emits image light. The optical path folding unit 120 guides (e.g., reflects) the image light from the image generation unit 110 to the imaging unit 130. The imaging unit 130 forms a virtual image S1 based on the image light from the optical path folding unit 120.

[0046] In this embodiment, image light refers to a light beam carrying image information. The image light emitted from the image generation unit 110 is reflected by the optical path folding unit 120 and reaches the imaging unit 130. The imaging unit 130 reflects the image light back to the optical path folding unit 120, which then transmits the imaging light to the human eye, allowing the user to view a virtual image. Here, the optical path folding unit 120 can change the propagation direction of the image light emitted from the image generation unit 110, causing the propagation path of the image light to be folded before reaching the imaging unit 130, thereby reducing the size of the display device. Furthermore, the image light undergoes fewer reflections within the display device, which is beneficial for improving light efficiency.

[0047] like Figure 4 As shown, the optical path folding unit 120 includes an optical path folding layer 121, inorganic glass 122, and organic substrate 123 stacked sequentially along the outgoing optical path of the imaging unit 130. When the display device is in a collision scenario, the organic substrate arranged on the outside of the inorganic glass can play a protective role, improving the safety performance of the display device in a collision scenario.

[0048] In this embodiment, the optical path folding layer 121 may also be referred to as a beam splitter layer, which is used to reflect at least a portion of the image light from the imaging unit 110 to the imaging unit 130, and to transmit at least a portion of the image light from the imaging unit 130.

[0049] The optical path folding layer 121 can adopt any one of the following six structures:

[0050] In the first case, the optical path folding layer 121 is a semi-transparent and semi-reflective film. The ratio of transmittance to reflectance of the semi-transparent and semi-reflective film (which can be called the spectral ratio) can be set according to actual needs, for example, the ratio of transmittance to reflectance is 7:3, 6:4, 5:5, 4:6 or 3:7, etc. Exemplarily, the semi-transparent and semi-reflective film can be deposited on the surface of inorganic glass 122.

[0051] A portion of the image light emitted from the image generation unit 110 (which may be circularly polarized light, elliptically polarized light, linearly polarized light, or unpolarized light) is reflected by a semi-transparent and semi-reflective membrane to the imaging unit 130. The imaging unit 130 then reflects the received image light back to the semi-transparent and semi-reflective membrane, and a portion of the image light passes through the semi-transparent and semi-reflective membrane and is emitted to the human eye to form a virtual image.

[0052] In the second embodiment, the optical path folding layer 121 includes a reflective polarizer located in the optical path of the image light emitted from the image generation unit 110 and the image light emitted from the imaging unit 130. The optical path folding unit 120 also includes a quarter-wave plate located in the optical path between the imaging unit 130 and the optical path folding layer 121. Exemplarily, the reflective polarizer can be adhered to the surface of the inorganic glass 122.

[0053] Linearly polarized light (S-light) emitted from image generation unit 110 in a first polarization direction reaches a reflective polarizer. The reflective polarizer reflects the linearly polarized light (S-light) in the first polarization direction and transmits linearly polarized light (P-light) in a second polarization direction. The reflective polarizer reflects the linearly polarized light (S-light) in the first polarization direction to a quarter-wave plate. The quarter-wave plate converts the linearly polarized light (S-light) in the first polarization direction into circularly polarized light or elliptically polarized light before it is emitted to imaging unit 130. The circularly polarized light or elliptically polarized light received by imaging unit 130 is converted into linearly polarized light (P-light) in the second polarization direction after passing through the quarter-wave plate, and then passes through the reflective polarizer to be emitted to the human eye, forming a virtual image.

[0054] Here, a reflective polarizer that transmits P-light and reflects S-light is used as an example for explanation. In other examples, a reflective polarizer can also be a polarizer that transmits S-light and reflects P-light.

[0055] The third type involves an optical path folding layer 121 comprising a quarter-wave plate and a reflective polarizer. The quarter-wave plate and the reflective polarizer are sequentially located on the optical path of the image light emitted from the image generation unit 110 and the optical path of the image light emitted from the imaging unit 130. Exemplarily, the reflective polarizer can be adhered to the surface of the inorganic glass 122. Exemplarily, the reflective polarizer and the quarter-wave plate can be integrally fabricated and then adhered to the surface of the inorganic glass 122; alternatively, the reflective polarizer and the quarter-wave plate can be sequentially adhered to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer inherent to the polarizer.

[0056] The circularly polarized or elliptically polarized light emitted from the image generation unit 110 reaches the quarter-wave plate. The quarter-wave plate converts the circularly polarized or elliptically polarized light into linearly polarized light (S-light) in the first polarization direction. The reflective polarizer reflects the linearly polarized light (S-light) from the quarter-wave plate back to the quarter-wave plate. The quarter-wave plate then converts the linearly polarized light (S-light) from the reflective polarizer back into circularly polarized or elliptically polarized light before it is emitted to the imaging unit 130. The circularly polarized or elliptically polarized light received by the imaging unit 130 is converted into linearly polarized light (P-light) in the second polarization direction after passing through the quarter-wave plate, and then passes through the reflective polarizer to the human eye, forming a virtual image.

[0057] Here, a reflective polarizer that transmits P-light and reflects S-light is used as an example for explanation. In other examples, a reflective polarizer can also be a polarizer that transmits S-light and reflects P-light.

[0058] Fourthly, the optical path folding layer 121 includes a quarter-wave plate, a reflective polarizer, and an absorptive polarizer. The quarter-wave plate, reflective polarizer, and absorptive polarizer are sequentially located on the optical path of the image light emitted from the image generation unit 110 and sequentially located on the optical path of the image light emitted from the imaging unit 130. The transmission axes of the reflective polarizer and the absorptive polarizer are in the same direction. For example, the absorptive polarizer, reflective polarizer, and quarter-wave plate can be integrally fabricated and then bonded to the surface of the inorganic glass 122. Alternatively, the absorptive polarizer, reflective polarizer, and quarter-wave plate can be sequentially bonded to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer inherent to the polarizer.

[0059] The circularly polarized or elliptically polarized light emitted from the image generation unit 110 is converted into linearly polarized light in the first polarization direction by a quarter-wave plate. A reflective polarizer reflects most of the linearly polarized light from the quarter-wave plate back to the quarter-wave plate, which then converts it back into circularly or elliptically polarized light before it is emitted to the imaging unit 130. An absorptive polarizer absorbs the linearly polarized light transmitted through the reflective polarizer. The circularly or elliptically polarized light received by the imaging unit 130 is converted into linearly polarized light in the second polarization direction after passing through the quarter-wave plate, and then sequentially passes through the reflective and absorptive polarizers before being emitted to the human eye, forming a virtual image. By using an absorptive polarizer, the image light emitted from the image generation unit 110 is prevented from directly entering the human eye to form a real image, thus avoiding interference with the virtual image and improving the user's viewing experience.

[0060] It should be noted that, in this embodiment, a polarizer can also be called a polarizing plate. The polarization directions of the reflective polarizer and the absorptive polarizer are the same, and both are in the second polarization direction. Thus, the reflective polarizer is used to reflect linearly polarized light in the first polarization direction and transmit linearly polarized light in the second polarization direction, while the absorptive polarizer is used to absorb linearly polarized light in the first polarization direction and transmit linearly polarized light in the second polarization direction. The first polarization direction and the second polarization direction are perpendicular. For example, the linearly polarized light in the first polarization direction is S-light, and the linearly polarized light in the second polarization direction is P-light. Alternatively, the linearly polarized light in the first polarization direction is P-light, and the linearly polarized light in the second polarization direction is S-light.

[0061] Fifthly, the optical path folding layer 121 includes a semi-reflective film, a first quarter-wave plate, and an absorptive polarizer. The semi-reflective film, the first quarter-wave plate, and the absorptive polarizer are sequentially located on the optical path of the image light emitted from the image generation unit 110 and sequentially located on the optical path of the image light emitted from the imaging unit 130. In this case, the optical path folding unit 120 also includes a second quarter-wave plate located on the optical path between the imaging unit 130 and the optical path folding layer 121.

[0062] For example, the absorptive polarizer, quarter-wave plate, and semi-transparent reflective film can be integrally manufactured and then bonded to the surface of the inorganic glass 122. Alternatively, the absorptive polarizer and the quarter-wave plate with the semi-transparent reflective film formed on its surface can be sequentially bonded to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer inherent to the polarizer.

[0063] A portion of the circularly polarized or elliptically polarized (left-handed) light emitted from the image generation unit 110 passes through a semi-reflective film and exits to a first quarter-wave plate. After passing through the first quarter-wave plate, it becomes linearly polarized light (S-ray) in the first polarization direction and then exits to an absorptive polarizer. The absorptive polarizer absorbs the linearly polarized light (S-ray) in the first polarization direction. By setting an absorptive polarizer, the image light emitted from the image generation unit 110 can be prevented from directly entering the human eye to form a real image, thus avoiding interference with the virtual image and improving the user's viewing experience.

[0064] Another portion of the circularly polarized or elliptically polarized (left-handed) light emitted from the image generation unit 110 is reflected by a semi-reflective membrane to a second quarter-wave plate. After passing through the second quarter-wave plate, it becomes linearly polarized light (S-light) with a second polarization direction. The imaging unit 130 reflects the linearly polarized light (S-light) with the second polarization direction back to the second quarter-wave plate. After passing through the second quarter-wave plate, it becomes circularly polarized or elliptically polarized (right-handed) light and is emitted to the semi-reflective membrane. A portion of it passes through the semi-reflective membrane and is emitted to the first quarter-wave plate. After passing through the first quarter-wave plate, it becomes linearly polarized light (P-light) with a second polarization direction. The linearly polarized light (P-light) with the second polarization direction passes through an absorptive polarizer and is emitted to the human eye, forming a virtual image.

[0065] The sixth type includes an optical path folding layer 121 comprising a semi-reflective film and an absorptive polarizer, which are sequentially located in the optical path of the image light emitted from the image generation unit 110 and in the optical path of the image light emitted from the imaging unit 130. In this case, the optical path folding unit 120 further includes a quarter-wave plate located in the optical path between the imaging unit 130 and the optical path folding layer 121. Exemplarily, the semi-reflective film and the absorptive polarizer can be integrally fabricated and then bonded to the surface of the inorganic glass 122.

[0066] A portion of the linearly polarized light (S-ray) emitted from the image generation unit 110 in the first polarization direction is absorbed by the absorptive polarizer after passing through the semi-transparent and semi-reflective film. By setting the absorptive polarizer, the image light emitted from the image generation unit 110 can be prevented from directly entering the human eye to form a real image, thus avoiding interference with the virtual image and improving the user's viewing experience.

[0067] A portion of the linearly polarized light (S-light) emitted from the image generation unit 110 in the first polarization direction is reflected by a semi-reflective film to a quarter-wave plate. The quarter-wave plate converts the received linearly polarized light (S-light) in the first polarization direction into circularly polarized light or elliptically polarized light before it is emitted to the imaging unit 130. The imaging unit 130 reflects the received circularly polarized light or elliptically polarized light back to the quarter-wave plate, where it becomes linearly polarized light (P-light) in the second polarization direction. A portion of the linearly polarized light (P-light) in the second polarization direction passes sequentially through the semi-reflective film and an absorptive polarizer before being emitted to the human eye, forming a virtual image.

[0068] For example, the thickness of the inorganic glass 122 is greater than or equal to 0.2 mm and less than 2 mm. Optionally, the thickness of the inorganic glass 122 is 0.5 mm to 1 mm, for example, 0.55 mm. In related technologies, the thickness of the inorganic glass is 2 mm or more, which results in a larger weight for the display device. By reducing the thickness of the inorganic glass, the weight of the display device can be reduced.

[0069] Optionally, the organic sheet 123 can be a single-layer structure or a multi-layer composite structure. Any layer of the organic sheet 123 can be made of the following materials: acrylic (i.e., polymethyl methacrylate (PMMA) (also known as plexiglass)), polycarbonate (PC), polyvinyl chloride (PVC), polystyrene (PS), and allyl diglycol carbonate (ADC, commonly known as CR-39). In some examples, the organic sheet 123 is a composite sheet composed of an acrylic sheet and a PC sheet.

[0070] For example, the thickness of the organic sheet 123 is 1 mm to 2 mm.

[0071] Because automotive display scenarios have higher requirements for the collision safety of display devices, the display device provided in this application embodiment is particularly suitable for automotive display scenarios. By selecting the thickness of the inorganic glass 122 and the thickness and material of the organic sheet 123, the relevant regulations for collision safety testing can be met.

[0072] In this embodiment, the light transmittance of the organic board 123 can be set according to actual needs, such as 50% to 100%. For example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. When the light transmittance of the organic board 123 is low, the intensity of ambient light reaching the optical path folding layer 121 through the organic board 123 is reduced, thereby reducing the intensity of ambient light reflected by the optical path folding layer 121. Therefore, the reflection of ambient light by the optical path folding unit can be reduced, improving the user experience.

[0073] In some examples, the light transmittance of the organic substrate 123 can be achieved by doping light-absorbing particles into at least one layer of the organic substrate 123, and / or by performing a surface treatment (e.g., roughening treatment) on the organic substrate 123. The embodiments of this application do not limit the type of light-absorbing particles, as long as they can reduce the light transmittance of the organic substrate 123.

[0074] Alternatively, the organic board 123 can be colored, such as gray, blue or brown, or the organic board 123 can be colorless.

[0075] Alternatively, the organic sheet 123 and the inorganic glass 122 can be bonded together by an optical adhesive layer.

[0076] The image generation unit 110 can be a direct imaging image source, such as an LCD, organic light-emitting diode, OLED display, or LED display. Here, the LED display can be a micro LED display or a mini LED display, etc.

[0077] In other examples, the image generation unit 110 includes a projection imaging source, which can be an optical engine (also known as a picture generation unit, PGU). The optical engine includes a light source and a reflective spatial light modulator. The light source generates a light beam, and the reflective spatial light modulator modulates and reflects the light beam to form image light. Exemplarily, the reflective spatial light modulator includes an LCoS modulator or a MEMS modulator. Optionally, in addition to the optical engine, the image generation unit 110 also includes a diffusion screen (not shown). The diffusion screen receives the light beam output by the optical engine and diffuses the received light beam (e.g., by diffuse reflection of the received light beam) to improve image quality.

[0078] This application does not limit the structure of the image generation unit 110, as long as it can provide the aforementioned image light.

[0079] Optionally, when the light beam provided by the image generation unit 110 is a two-dimensional image light, the virtual image seen by the user is a two-dimensional image. Alternatively, when the light beam provided by the image generation unit 110 is a three-dimensional image light, the virtual image seen by the user is a three-dimensional image.

[0080] In some examples, the image light emitted by the image generation unit 110 can be linearly polarized light, circularly polarized light, or elliptically polarized light.

[0081] When the polarization state of the image light emitted from the image source in the image generation unit 110 differs from the target polarization state required by the image generation unit 110, the image generation unit 110 may further include a polarization state conversion element for converting the image light generated by the image source into the target polarization state. The polarization state conversion element includes, but is not limited to, a quarter-wave plate, a P-polarizer, an S-polarizer, or combinations thereof (e.g., a quarter-wave plate and a P-polarizer, or a quarter-wave plate and an S-polarizer). For example, by placing a quarter-wave plate on the surface of the LCD, the image light emitted from the LCD can be converted into circularly polarized light or elliptically polarized light.

[0082] In some examples, the imaging unit 130 includes an opaque reflective imaging element, such as a curved mirror (e.g., a curved mirror made of metal). In other examples, the imaging unit 130 includes a translucent reflective imaging element, such as a lens, a lens group consisting of multiple lenses, or a translucent curved mirror. When the imaging unit 130 uses an opaque reflective imaging element, the display device is a virtual reality (VR) display device; when the imaging unit 130 uses a translucent reflective imaging element, the display device is an augmented reality (AR) display device.

[0083] Optionally, the imaging unit 130 may also include a polarization state conversion element, such as a quarter-wave plate. The polarization state conversion element may be attached to the surface of the reflective imaging element, or the polarization state conversion element may be arranged at a distance from the reflective imaging element.

[0084] exist Figure 4 In the illustrated embodiment, the light-emitting surface of the image generation unit 110 is opposite to the optical path folding unit 120. The image light emitted from the image generation unit 110 is reflected by the optical path folding unit 120 to the imaging unit 130, and then the imaging unit 130 reflects the image light from the optical path folding unit 120 back to the optical path folding unit 120, and finally exits from the optical path folding unit 120. The image light undergoes fewer reflections within the display device, which is beneficial for improving light efficiency.

[0085] In other embodiments, the light-emitting surface of the image generation unit 110 is opposite to the imaging unit 130. The image light emitted from the image generation unit 110 is reflected by the imaging unit 130 to the optical path folding unit 120, then reflected by the optical path folding unit 120 to the imaging unit 130, and then reflected again by the imaging unit 130 to the optical path folding unit 120 before being emitted. In this example, the image distortion is small during display, and the image quality of the virtual image is good.

[0086] It should be noted that, Figure 4 In the illustration, the image generation unit 110 is located above the imaging unit 130, and both the image generation unit 110 and the imaging unit 130 are located on the right side of the optical path folding unit 120 (the side away from the user). In practical applications, the image generation unit 110 can also be arranged below the imaging unit 130.

[0087] Figure 5 This is a schematic diagram of the structure of an optical path folding unit 120 provided in an embodiment of this application. Figure 5 As shown, the optical path folding unit 120 includes an outgoing optical path along the imaging unit 130. Figure 5 The optical path folding layer 121, inorganic glass 122, antireflection layer 124, and organic substrate 123 are stacked sequentially (in the direction indicated by the middle arrow). The antireflection layer 124 is used to reduce the reflection of ambient light from the outer surface of the display device. The antireflection layer 123 may include at least two polarization state conversion layers. By using at least two polarization state conversion layers to control the polarization state of ambient light incident on the optical path folding unit, the reflection of ambient light can be reduced, so that the display area of ​​the display device appears dark, for example, black, when it is not in operation.

[0088] Exemplarily, the antireflection layer 124 includes a quarter-wave plate 1241, a first linear polarizer 1242, and a second linear polarizer 1243, sequentially stacked along the outgoing light path of the imaging unit 130. The transmission axis of the first linear polarizer 1242 and the transmission axis of the second linear polarizer 1243 form an angle greater than 0 degrees and less than 90 degrees. The first linear polarizer 1242 and the quarter-wave plate 1241 are stacked to form a circular polarizer. In this embodiment, since the quarter-wave plate 1241, the first linear polarizer 1242, and the second linear polarizer 1243 can all control the polarization state of the received light, they can also be referred to as a polarization state conversion layer.

[0089] The light component in the ambient light with the first polarization direction (which is the same as the direction of the transmission axis of the second linear polarizer 1243) passes through the second linear polarizer 1243. Then, the light component with the second polarization direction (which is the same as the direction of the transmission axis of the first linear polarizer 1242) passes through the first linear polarizer 1242. Since the transmission axis of the first linear polarizer 1242 and the transmission axis of the second linear polarizer 1243 form an angle, the intensity of the light component with the second polarization direction is lower than the intensity of the light component with the first polarization direction. The light component in the second polarization direction becomes left-handed (or right-handed) light after passing through the quarter-wave plate 1241. It then passes through the inorganic glass 122 and reaches the optical path folding layer 121. After reflection by the optical path folding layer 121, it becomes right-handed (or left-handed) light. The right-handed light then becomes linearly polarized light in the third polarization direction after passing through the quarter-wave plate 1241. The third polarization direction is perpendicular to the second polarization direction, and this linearly polarized light cannot pass through the first linear polarizer 1242. Therefore, from the outside, the display area of ​​the display device appears black. Here, the second linear polarizer 1243 first reduces the intensity of ambient light, further reducing the ambient light entering the display device. Combined with a circular polarizer, this can further reduce or even completely eliminate the ambient light reflected back from the display device.

[0090] Alternatively, in other embodiments, the antireflection layer 124 may not include the second linear polarizer 1243, but only the quarter-wave plate 1241 and the first linear polarizer 1242.

[0091] Due to the inherent properties of the organic substrate 123, the phase of light changes after passing through it. If the organic substrate 123 is placed between any two polarization state conversion layers in the antireflection layer 124, for example, between the quarter-wave plate 1241 and the first linear polarizer 1242, or between the antireflection layer 124 and the inorganic glass 122, it will adversely affect the antireflection effect of the antireflection layer 124. Therefore, in this embodiment, placing the antireflection layer 124 between the organic substrate 123 and the inorganic glass 122 ensures the antireflection reduction effect of the antireflection layer 124. Furthermore, the organic substrate 123 is located on the side of the antireflection layer 124 furthest from the inorganic glass 122, which also protects the antireflection layer 124.

[0092] Optionally, an optical adhesive layer is provided between the inorganic glass 122 and the organic substrate 123.

[0093] For example, a linear polarizer may include a first triacetylcellulose (TAC) layer, a polyvinyl alcohol (PVA) layer, a second TAC layer, and a pressure-sensitive adhesive (PSA) layer stacked sequentially. The first and second TAC layers provide support and protection, and prevent shrinkage of the linear polarizer; the PVA layer is used to achieve polarization. The PSA layer is used to attach the linear polarizer to other structures.

[0094] Because one surface of the polarizer (i.e., the surface where the PSA layer is located) is adhesive, it can be directly attached to adjacent layer structures. For the non-adhesive surface of the polarizer, it can be bonded to adjacent layer structures using optical adhesive.

[0095] For example, Figure 5 In the illustrated embodiment, one surface of the second linear polarizer 1243 is bonded to the organic substrate 123 via an optical adhesive layer 126. In other embodiments, one surface of the circular polarizer may also be bonded to the inorganic glass 122 via an optical adhesive layer.

[0096] For example, the light transmittance of the optical adhesive layer is 50% to 100%. For example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%.

[0097] When the transmittance of the optical adhesive layer is low, the intensity of ambient light reaching the optical path folding layer 121 decreases, thereby reducing the intensity of ambient light reflected by the optical path folding layer 121. Therefore, the reflection of ambient light by the optical path folding unit can be reduced, improving the user experience. The transmittance of the optical adhesive layer can be controlled by doping light-absorbing particles into the optical adhesive. This application embodiment does not limit the type or amount of light-absorbing particles.

[0098] The optical path folding unit also includes an optical film 125, which is located on the side of the organic substrate 123 away from the inorganic glass 122, and the optical film 125 includes at least one of the following: an AR film and an anti-glare film. This optical film 125 can further reduce the reflection of ambient light by the optical folding unit, improving the user experience.

[0099] Optionally, the display device also includes a housing (not shown). The housing has an observation window facing the user's eyes for viewing the virtual image. The image generation unit 110 and the imaging unit 130 are both located within the housing, the optical path folding unit 120 is located at the observation window, and the organic panel 123 is positioned closer to the outer side of the housing than the inorganic glass 122. In this way, the housing protects the individual units and integrates them together, facilitating overall movement of the display device.

[0100] The shape of the housing is not limited in the embodiments disclosed herein, and it can be a cuboid or a cylinder, etc. In addition, when the display device is integrated into a large product, such as the seat of a vehicle, the seat can be used to provide a receiving cavity, and the image generation unit 110 and the imaging unit 130 can be directly placed in the receiving cavity, with the optical path folding unit 120 arranged at the opening of the receiving cavity, thereby eliminating the need for the housing.

[0101] Optionally, the display device may also include a main processor. The main processor is used to send image data to the image generation unit.

[0102] Optionally, the display device also includes a power supply for powering the main processor and the image generation unit.

[0103] Figure 6 This is a circuit diagram of the display device provided in an embodiment of this application. Figure 6 As shown, the circuitry in the display device mainly includes a main processor (host CPU) 1101, an external memory interface 1102, internal memory 1103, an audio module 1104, a video module 1105, a power supply module 1106, a wireless communication module 1107, I / O interfaces 1108 and 1109, and a display circuit 1110. The main processor 1101 and its peripheral components, such as the external memory interface 1102, internal memory 1103, audio module 1104, video module 1105, power supply module 1106, wireless communication module 1107, I / O interfaces 1108 and 1109, and display circuit 1110, can be connected via a bus. The main processor 1101 can also be referred to as a front-end processor.

[0104] Furthermore, the circuit diagrams illustrated in the embodiments of this application do not constitute a specific limitation on the display device. In other embodiments of this application, the display device may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0105] The main processor 1101 includes one or more processing units, such as an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). These different processing units can be independent devices or integrated into one or more processors.

[0106] The main processor 1101 may also include a memory for storing computer instructions and data. In some embodiments, the memory in the main processor 1101 is a cache memory. This memory can store instructions or data that the main processor 1101 has just used or is recurring. If the main processor 1101 needs to use the instruction or data again, it can directly retrieve it from the memory. This avoids repeated accesses, reduces the waiting time of the main processor 1101, and thus improves system efficiency.

[0107] In some embodiments, the display device may further include multiple input / output (I / O) interfaces 1108 connected to the main processor 1101. The I / O interfaces 1108 may include inter-integrated circuit (I2C) interfaces, inter-integrated circuit sound (I2S) interfaces, pulse code modulation (PCM) interfaces, universal asynchronous receiver / transmitter (UART) interfaces, mobile industry processor interfaces (MIPI), general-purpose input / output (GPIO) interfaces, subscriber identity module (SIM) interfaces, and / or universal serial bus (USB) interfaces, etc. The aforementioned I / O interfaces 1108 can connect to devices such as mice, touchpads, keyboards, cameras, speakers, microphones, etc., and can also connect to physical buttons on the display device (e.g., volume buttons, brightness adjustment buttons, power buttons, etc.).

[0108] The external memory interface 1102 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 1101 through the external memory interface 1102 to perform data storage.

[0109] Internal memory 1103 can be used to store executable program code, including instructions. Internal memory 1103 may include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as a call function, 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.). Furthermore, internal memory 1103 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc. The main processor 1101 executes various functional applications and data processing of the display device by running instructions stored in internal memory 1103 and / or instructions stored in memory located in the main processor 1101.

[0110] The display device can implement audio functions, such as music playback and phone calls, through the audio module 1104 and application processor.

[0111] The audio module 1104 is used to convert digital audio information into analog audio signals for output, and also to convert analog audio input into digital audio signals. The audio module 1104 can also be used for encoding and decoding audio signals, such as for playback or recording. In some embodiments, the audio module 1104 may be located in the main processor 1101, or some functional modules of the audio module 1104 may be located in the main processor 1101.

[0112] The video interface 1109 can receive externally input audio and video signals, specifically including High Definition Multimedia Interface (HDMI), Digital Visual Interface (DVI), Video Graphics Array (VGA), and DisplayPort (DP). The video interface 1109 can also output video. When the display device is used as a head-up display, the video interface 1109 can receive speed and power signals from peripheral devices, as well as externally input AR video signals. When the display device is used as a desktop display, the video interface 1109 can receive video signals from an external computer or terminal device.

[0113] The video module 1105 can decode the video input from the video interface 1109, such as performing H.264 decoding. The video module can also encode video captured by the display device, such as performing H.264 encoding on video captured by an external camera. Furthermore, the main processor 1101 can also decode the video input from the video interface 1109 and then output the decoded image signal to the display circuit 1110.

[0114] The display circuit 1110 drives the image generation unit 110 to display the corresponding image. In this embodiment, the video interface 1109 receives an externally input video source signal. The video module 1105 decodes and / or digitizes the signal, then outputs one or more image signals to the display circuit 1110. The display circuit 1110 drives the image generation unit 110 to perform imaging based on the input image signal, and then outputs imaging light. Furthermore, the main processor 1101 can also output image signals to the display circuit 1110. Additionally, the display circuit 1110 can also drive the image generation unit 110 to display interactive images based on the input image signal.

[0115] The processor 1101 can control the image generation unit 110 to display images by executing computer instructions.

[0116] The power module 1106 is used to provide power to the main processor 1101 and the image generation unit 110 according to the input power (e.g., DC power). The power module 1106 may include a rechargeable battery, which can provide power to the main processor 1101 and the image generation unit 110.

[0117] The wireless communication module 1107 enables the display device to communicate wirelessly with the outside world. It can provide solutions for wireless communication such as wireless local area networks (WLAN) (e.g., wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR). The wireless communication module 1107 can be one or more devices integrating at least one communication processing module. The wireless communication module 1107 receives electromagnetic waves via an antenna, performs frequency modulation and filtering of the electromagnetic wave signal, and sends the processed signal to the main processor 1101. The wireless communication module 1107 can also receive signals to be transmitted from the main processor 1101, perform frequency modulation and amplification, and then convert them into electromagnetic waves for radiation via the antenna.

[0118] In addition, the video data decoded by the video module 1105 can be input not only through the video interface 1109, but also wirelessly received through the wireless communication module 1107 or read from external storage. For example, the display device can receive video data from the terminal device or the in-vehicle entertainment system through the vehicle's wireless local area network, and the display device can also read audio and video data stored in external storage.

[0119] This application also provides a means of transportation that includes any of the aforementioned display devices.

[0120] Please see Figure 7 , Figure 7 This is a functional diagram of a means of transportation provided in an embodiment of this application.

[0121] The vehicle may include various subsystems, such as the sensor system 21, control system 22, one or more peripheral devices 23 (one is shown as an example), power supply 24, computer system 25, and display system 26 shown in the figure. These subsystems can communicate with each other. The display system 22 may include the display device provided in the embodiments of this application. The vehicle may also include other functional systems, such as an engine system that provides power to the vehicle, a cockpit, etc., which are not limited herein.

[0122] The sensor system 21 may include several detection devices that can sense the measured information and convert the sensed information into electrical signals or other desired forms of information output according to a certain rule. Figure 7 As shown, these detection devices may include a Global Positioning System (GPS), a vehicle speed sensor, an Inertial Measurement Unit (IMU), a radar unit, a laser rangefinder, a camera device, a wheel speed sensor, a steering sensor, a gear sensor, or other components for automatic detection, etc., which are not limited in this application.

[0123] The control system 22 may include several components, such as the steering unit, braking unit, lighting system, automatic driving system, map navigation system, network time synchronization system, and obstacle avoidance system shown in the figure. The control system 22 can receive information (such as vehicle speed, distance, etc.) sent by the sensor system 21 to realize functions such as automatic driving and map navigation.

[0124] 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 is not limited in this application.

[0125] Peripheral device 23 may include several components, such as a communication system, a touch screen, a user interface, a microphone, and a speaker. The communication system is used to enable network communication between the vehicle and other devices. In practical applications, the communication system can employ wireless or wired communication technologies to achieve network communication between the vehicle and other devices. The wired communication technology can refer to communication between the vehicle and other devices via network cables or fiber optic cables.

[0126] Power source 24 represents a system that provides electricity or energy to the vehicle, which may include, but is not limited to, rechargeable lithium batteries or lead-acid batteries. In practical applications, one or more battery components in the power source are used to provide electrical energy or power for vehicle startup, and the type and materials of the power source are not limited in this application.

[0127] Several functions of the vehicle can be controlled and implemented by the computer system 25. The computer system 25 may include one or more processors 2501 (the figure shows one processor as an example) and memory 2502 (also referred to as a storage device). In practical applications, the memory 2502 may be located inside the computer system 25 or outside the computer system 25, for example, as a cache in the vehicle, etc., which is not limited in this application.

[0128] The processor 2501 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2501 can be used to run relevant programs or instructions corresponding to programs stored in the memory 2502 to implement the corresponding functions of the vehicle.

[0129] The memory 2502 may include volatile memory, such as RAM; it may also include non-volatile memory, such as ROM, flash memory, HDD, or SSD; or it may include a combination of the above types of memory. The memory 2502 can be used to store a set of program code or instructions corresponding to the program code, so that the processor 2501 can call the program code or instructions stored in the memory 2502 to implement the corresponding functions of the vehicle. In this application, the memory 2502 may store a set of program code for vehicle control. The processor 2501 can call this program code to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is detailed below in this application.

[0130] Optionally, in addition to storing program code or instructions, the memory 2502 may also store information such as road maps, driving routes, and sensor data. The computer system 25 can be combined with other components in the vehicle functional framework diagram, such as sensors in the sensor system and GPS, to realize the relevant functions of the vehicle. For example, the computer system 25 can control the driving direction or speed of the vehicle based on data input from the sensor system 21; this application does not impose limitations on this.

[0131] The display system 26 can interact with other systems within the vehicle. For example, it can display navigation information sent by the control system 22, or play videos sent by the computer system 25 and peripheral devices 23. The specific structure of the display system 26 is described in the embodiments of the display devices described above, and will not be repeated here.

[0132] The four subsystems illustrated in this embodiment—sensor system 21, control system 22, computer system 25, and display system 26—are merely examples and do not constitute a limitation. In practical applications, vehicles can combine several components according to different functions to obtain subsystems with corresponding functions. In practical applications, vehicles may include more or fewer subsystems or components, and this application does not impose any limitations.

[0133] The vehicles used in this application can be known vehicles such as automobiles, airplanes, ships, and rockets, or they can be new vehicles that will emerge in the future. Automobiles can be electric vehicles, gasoline-powered vehicles, or hybrid vehicles, such as pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell vehicles, and new energy vehicles; this application does not specifically limit their use.

[0134] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0135] The above description is only one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of this application should be included within the protection scope of this application.

Claims

1. A display device, characterized in that, The display device includes: an image generation unit, an optical path folding unit, an imaging unit, and a housing; The image generation unit is used to emit image light; The optical path folding unit is used to guide the image light from the image generation unit to the imaging unit; The imaging unit is used to form a virtual image based on the image light from the optical path folding unit; The optical path folding unit includes an optical path folding layer, inorganic glass, and organic substrate stacked sequentially along the outgoing optical path of the imaging unit; The image generation unit and the imaging unit are located inside the housing, which has an observation window, and the optical path folding unit is located at the observation window.

2. The display device according to claim 1, characterized in that, The optical path folding unit further includes an anti-reflection layer, which comprises at least two polarization state conversion layers and is located between the inorganic glass and the organic substrate.

3. The display device according to claim 2, characterized in that, The antireflection layer comprises a quarter-wave plate, a first linear polarizer, and a second linear polarizer, sequentially stacked along the outgoing optical path of the imaging unit; or, The antireflection layer comprises a quarter-wave plate and a first linear polarizer stacked sequentially along the outgoing optical path of the imaging unit.

4. The display device according to claim 1, characterized in that, The optical path folding layer is a semi-transparent and semi-reflective film; Alternatively, the optical path folding layer includes a quarter-wave plate and a reflective polarizer stacked sequentially along the outgoing optical path of the imaging unit; Alternatively, the optical path folding layer may include a quarter-wave plate, a reflective polarizer, and an absorptive polarizer stacked sequentially along the outgoing optical path of the imaging unit, wherein the transmission axes of the reflective polarizer and the absorptive polarizer are in the same direction.

5. The display device according to claim 1, characterized in that, The light transmittance of the organic board is 50%~100%.

6. The display device according to claim 1, characterized in that, The thickness of the organic board is 1mm to 2mm.

7. The display device according to claim 1, characterized in that, An optical adhesive layer is provided between the optical path folding layer and the inorganic glass, and / or, an optical adhesive layer is provided between the inorganic glass and the organic substrate.

8. The display device according to claim 7, characterized in that, The light transmittance of the optical adhesive layer is 50%~100%.

9. The display device according to claim 1, characterized in that, The thickness of the inorganic glass is greater than or equal to 0.2 mm and less than 2 mm.

10. The display device according to claim 1, characterized in that, The optical path folding unit further includes an optical film located on the side of the organic substrate away from the inorganic glass, and the optical film includes at least one of the following: an anti-refletance (AR) film and an anti-glare film.

11. The display device according to claim 1, characterized in that, The image generation unit includes a direct imaging image source or a projection imaging image source.

12. The display device according to claim 11, characterized in that, The direct imaging source includes at least one of the following: a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, or a light-emitting diode (LED) display.

13. The display device according to claim 11, characterized in that, The projection imaging source includes an illumination source and a spatial light modulator. The illumination source is used to generate a light beam, and the spatial light modulator is used to modulate and reflect the light beam to obtain the image light.

14. The display device according to claim 13, characterized in that, The spatial light modulator includes a silicon-based liquid crystal (LCoS) modulator or a microelectromechanical system (MEMS) modulator.

15. The display device according to claim 1, characterized in that, The image generation unit includes a polarization state conversion element.

16. The display device according to claim 1, characterized in that, The imaging unit includes a curved reflector.

17. The display device according to claim 1, characterized in that, The display device includes a processor for sending image data to the image generation unit.

18. A means of transportation, characterized in that, Includes the display device as described in any one of claims 1 to 17, wherein the display device is mounted on the vehicle.

Images