Display devices and vehicles

Abstract

A display device and a vehicle are disclosed, which relate to the field of display technology. The display device includes a picture generation unit, a light path folding unit, and an imaging unit. The picture generation unit is configured to emit image light. The light path folding unit is configured to guide the image light from the picture generation unit to the imaging unit. The imaging unit is configured to form a virtual image based on the image light from the light path folding unit. The light path folding unit includes a light path folding layer, inorganic glass, and an organic plate sequentially stacked along an output light path of the imaging unit. The display device has high safety performance in collision scenarios.

Description

[Technical Field]

[0001] This application relates to the field of display technology, and in particular to display devices and vehicles. [Background technology]

[0002] Display devices are becoming more and more widely used in everyday life.

[0003] In related art, a display device includes a picture generation unit, a light path folding unit, and an imaging unit. The picture generation unit emits image light, and the light path folding unit is used to guide the image light to the imaging unit, which then reflects the image light back to the light path folding unit. The light path folding unit typically includes a light path folding layer and inorganic glass sequentially arranged on the output light path of the imaging unit. The light path folding layer is attached to the inorganic glass and is used to transmit at least a portion of the image light from the imaging unit toward the human eye. In this way, a user can view a virtual image.

[0004] However, inorganic glass is susceptible to breakage in a crash scenario, resulting in a safety risk. Summary of the Invention

[0005] The present application provides a display device and vehicle to improve the safety performance of the display device in a crash scenario. [Means for solving the problem]

[0006] According to one aspect, the present application provides a display device. The display device includes a picture generation unit, a light path folding unit, and an imaging unit. The picture generation unit is configured to emit image light. The light path folding unit is configured to guide the image light from the picture generation unit to the imaging unit. The imaging unit is configured to form a virtual image based on the image light from the light path folding unit. The light path folding unit includes a light path folding layer, inorganic glass, and an organic plate sequentially stacked along an output light path of the imaging unit.

[0007] When the display device is in a collision scenario, the organic plate disposed on the outside of the inorganic glass can provide protection to improve the safety performance of the display device in the collision scenario. The display device is particularly applicable to an in-vehicle display scenario.

[0008] To further improve the user experience, the light path folding unit may further include an anti-reflection layer configured to reduce reflection of ambient light on the outer surface of the display device. The anti-reflection layer may include at least two polarization state conversion layers. The at least two polarization state conversion layers are used to control the polarization state of the ambient light entering the light path folding unit, thereby reducing reflection of the ambient light, and the display area of ​​the display device in a non-operating state is in a dark state, for example, black.

[0009] Since the organic plate has a retardation effect on the phase of light, in order to avoid the adverse effect of the organic plate on the effect of the antireflection layer, all polarization state converting layers in the antireflection layer may be disposed between the inorganic glass and the organic plate.

[0010] Optionally, the anti-reflective layer may use any one of the following structures:

[0011] In the first structure, the antireflection layer includes a quarter-wave plate, a first linear polarizer, and a second linear polarizer stacked in sequence along the output optical path of the imaging unit. The optical transmission axis of the first linear polarizer and the optical transmission axis of the second linear polarizer form an angle. The angle between the optical transmission axes of the first linear polarizer and the second linear polarizer is controlled, thereby controlling the effect of reducing the reflectivity of the antireflection layer against ambient light. In this case, the combination of the quarter-wave plate and the first linear polarizer can be called a circular polarizer.

[0012] In the second structure, the anti-reflection layer includes a quarter-wave plate and a first linear polarizer stacked in sequence along the output optical path of the imaging unit.

[0013] Optionally, the folding layer may have any one of the following structures: In a first structure, the folding layer is a semi-transmissive semi-reflective film; In a second structure, the folding layer includes a quarter-wave plate and a reflective polarizer stacked in sequence along the output optical path of the imaging unit; In a third structure, the folding layer includes a quarter-wave plate, a reflective polarizer, and an absorptive polarizer stacked in sequence along the output optical path of the imaging unit, with the light transmission axis direction of the reflective polarizer being the same as the light transmission axis direction of the absorptive polarizer; In a fourth structure, the folding layer includes a reflective polarizer, and the folding unit further includes a quarter-wave plate arranged on the optical path between the imaging unit and the folding layer. In a fifth structure, the folding layer includes a semi-transmissive, semi-reflective film, a first quarter-wave plate, and an absorptive polarizer stacked in sequence along the output optical path of the imaging unit, and the folding unit further includes a second quarter-wave plate disposed on the optical path between the imaging unit and the folding layer. In a sixth structure, the folding layer includes a semi-transmissive, semi-reflective film and an absorptive polarizer stacked in sequence along the output optical path of the imaging unit, and the folding unit further includes a quarter-wave plate disposed on the optical path between the imaging unit and the folding layer.

[0014] The light path folding layer of each of the six structures can reflect at least a portion of the image light from the picture generating unit to the imaging unit and transmit at least a portion of the image light emitted by the imaging unit.

[0015] Optionally, the organic board is a single-layer structure or a multi-layer composite structure. When the organic board is a single-layer structure, the organic board may be an acrylic board, a polycarbonate board, or a polyvinyl chloride board. When the organic board is a multi-layer composite structure, the organic board includes at least two different boards laminated together, and each board may be an acrylic board, a polycarbonate board, or a polyvinyl chloride board.

[0016] Optionally, the light transmittance of the organic plate is 50% to 100%. The appropriate light transmittance of the organic plate can be selected based on requirements, thereby controlling the reflectance of the display screen to ambient light.

[0017] Optionally, the organic board may be colorless or colored, for example, dark brown or gray.

[0018] For example, the thickness of the organic board is 1 mm to 2 mm, for example 1.2 mm.

[0019] For example, the thickness of the inorganic glass is 0.2 mm or more and less than 2 mm, for example, 0.5 mm to 1 mm. The thickness of the inorganic glass is small, which helps to reduce the weight of the display device.

[0020] Optionally, there is an optical adhesive layer between the folding layer and the inorganic glass, or the folding layer is formed directly on the inorganic glass.

[0021] Optionally, an optical adhesive layer is present between the inorganic glass and the organic plate. For example, when an anti-reflection layer is disposed between the inorganic glass and the organic plate, the organic plate is adhered to the anti-reflection layer using an optical adhesive, or the inorganic glass is adhered to the anti-reflection layer using an optical adhesive, thereby resulting in an optical adhesive layer between the inorganic glass and the organic plate. In another example, when the optical path folding unit does not include an anti-reflection layer, the inorganic glass may be adhered to the organic plate using an optical adhesive layer.

[0022] Optionally, the optical transmittance of the optical adhesive layer is 50% to 100%. The appropriate optical transmittance of the optical adhesive layer can be selected based on requirements, thereby controlling the reflectance of the display screen to ambient light.

[0023] Optionally, the light path folding unit further includes an optical film, the optical film being disposed on a side of the organic plate away from the inorganic glass, the optical film including at least one of an anti-reflectance (AR) film and an anti-glare film, which can further reduce reflection of ambient light at the light path folding unit, thereby improving user experience.

[0024] In some examples, the picture generation unit includes a direct imaging image source or a projected imaging image source. For example, the direct imaging image source includes a liquid crystal display (LCD), an OLED display, or a light-emitting diode (LED) display. The projected imaging image source includes an illumination light source and a reflective spatial light modulator. The illumination light source is configured to generate a light beam, and the reflective spatial light modulator is configured to modulate and reflect the light beam generated by the light source to obtain image light. When the picture generation unit includes a projected imaging image source, the picture generation unit further includes a diffusion screen configured to transmit the image light and form a real image. For example, the reflective spatial light modulator includes a liquid crystal on silicon (LCoS) modulator or a micro-electromechanical system (MEMS) modulator.

[0025] Optionally, the picture generating unit may further include a polarization state converting element, and the polarization state converting element is configured to convert the polarization state of the image light generated by the image source into a target polarization state. In this way, the image source type can be randomly selected based on requirements, and implementation is more convenient.

[0026] Optionally, the image light emitted by the picture generation unit is linearly, circularly or elliptically polarized.

[0027] In some examples, the imaging unit includes a curved reflective mirror.

[0028] In some examples, the light output surface of the picture generating unit faces the light path folding unit. The image light emitted by the picture generating unit is reflected by the light path folding unit to the imaging unit, and then the imaging unit reflects the image light from the light path folding unit back to the light path folding unit, and finally the image light is emitted from the light path folding unit. The number of reflections of the image light inside the display device is reduced, which helps to improve light efficiency.

[0029] In some other examples, the light output surface of the picture generation unit faces the imaging unit. The image light emitted by the picture generation unit is reflected by the imaging unit to the light path folding unit, then reflected by the light path folding unit to the imaging unit, then reflected by the imaging unit to the light path folding unit again, and then emitted from the light path folding unit. In this example, the image distortion is small in the display process, and the picture quality of the virtual image is good.

[0030] Optionally, the display device further includes a housing. The housing has an observation window. Both the picture generation unit and the imaging unit are disposed within the housing. The light path folding unit is disposed at the observation window, and the organic plate is disposed outside the housing. The housing may protect the units, and the units are integrated with each other using the housing to facilitate overall movement of the display device.

[0031] Optionally, the display device further comprises a host processor, the host processor configured to send the image data to the picture generation unit, the picture generation unit configured to provide image light based on the received image data.

[0032] In some examples, the display device further includes a power supply that provides power to the host processor and the picture generation unit.

[0033] In some cases, the display device may be a desktop display device, such as a monitor or television.

[0034] According to another aspect, the present application provides a display device, the structure of which is similar to that of the display device described above, but the inorganic glass is replaced with another organic plate, which has good optical performance and a small retardation effect on the phase of light.

[0035] According to yet another aspect, the present application provides a vehicle. The vehicle includes any one of the display devices described above. The display device is installed on the vehicle. For example, the vehicle may include, but is not limited to, a car, an airplane, a train, or a ship. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a diagram illustrating a state in which a display device according to an embodiment of the present application is used; [Figure 2] FIG. 10 is a diagram illustrating a state in which another display device is used according to an embodiment of the present application. [Figure 3] FIG. 10 is a diagram illustrating a state in which yet another display device is used according to an embodiment of the present application. [Figure 4] 1 is a diagram of a structure of a display device according to an embodiment of the present application; [Figure 5] FIG. 2 is a diagram of the structure of an optical path folding unit according to an embodiment of the present application. [Figure 6] 1 is a circuit diagram of a display device according to an embodiment of the present application; [Figure 7] 1 is a diagram of a vehicle's functionality according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0037] The following describes in detail the display device provided in the embodiments of the present application with reference to the accompanying drawings. The display device may be used as a general office display (e.g., 100a shown in FIG. 1), or as a television for home entertainment (e.g., 100b shown in FIG. 2), or as an in-vehicle display (e.g., 100c shown in FIG. 3, where the display device is installed in a vehicle seat or on the dashboard), or as a portable display device, so that the display device can be used more flexibly in various scenarios. The physical size, display size, and resolution of the display device may be adjusted based on the usage scenario. In the present application, the display device may also be referred to as a virtual image display system or a display system.

[0038] 4 is a diagram of a structure of a display device according to an embodiment of the present application. As shown in FIG. 4, the display device includes a picture generation unit 110, an optical path folding unit 120, and an imaging unit 130. The picture generation unit 110 is configured to emit image light. The optical path folding unit 120 is configured to guide (e.g., reflect) the image light from the picture generation unit 110 to the imaging unit 130. The imaging unit 130 is configured to form a virtual image S1 based on the image light from the optical path folding unit 120.

[0039] In this embodiment of the present application, the image light is a light beam carrying image information. The image light emitted by the picture generation unit 110 is reflected by the light path folding unit 120 and then reaches the imaging unit 130. The imaging unit 130 reflects the image light to the light path folding unit 120, which transmits the image light toward the human eye, allowing the user to view a virtual image. Here, the light path folding unit 120 changes the propagation direction of the image light emitted by the picture generation unit 110, so that the propagation path of the image light is folded and the image light reaches the imaging unit 130, thereby reducing the size of the display device. In addition, the image light is reflected less times within the display device, which helps improve light efficiency.

[0040] 4, the light path folding unit 120 includes a light path folding layer 121, inorganic glass 122, and an organic plate 123, which are sequentially stacked along the output light path of the imaging unit 130. When the display device is in a collision scenario, the organic plate disposed outside the inorganic glass can provide protection to improve the safety performance of the display device in the collision scenario.

[0041] In this embodiment of the present application, the light path folding layer 121, which may also be referred to as an optical splitting layer, is configured to reflect at least a portion of the image light from the picture generating unit 110 to the imaging unit 130 and transmit at least a portion of the image light from the imaging unit 130.

[0042] The light folding layer 121 may use any one of the following six structures.

[0043] In the first structure, the light path folding layer 121 is a semi-transmissive semi-reflective film. The ratio of the transmittance to the reflectance (which may be called the split ratio) of the semi-transmissive semi-reflective film may be set based on actual requirements. For example, the ratio of the transmittance to the reflectance may be 7:3, 6:4, 5:5, 4:6, or 3:7. For example, the semi-transmissive semi-reflective film may be deposited on the surface of inorganic glass 122.

[0044] A portion of the image light (which may be circularly polarized, elliptically polarized, linearly polarized, or unpolarized) emitted by the picture generating unit 110 is reflected by the semi-transmissive semi-reflective film to the imaging unit 130, which then reflects the received image light back to the semi-transmissive semi-reflective film. A portion of the image light is emitted through the semi-transmissive semi-reflective film to the human eye, forming a virtual image.

[0045] In the second structure, the folding layer 121 includes a reflective polarizer, which is disposed on the optical path of the image light emitted by the picture generating unit 110 and the optical path of the image light emitted by the imaging unit 130. The folding unit 120 further includes a quarter-wave plate disposed on the optical path between the imaging unit 130 and the folding layer 121. For example, the reflective polarizer may be attached to the surface of the inorganic glass 122.

[0046] The linearly polarized light (S light) of the first polarization direction emitted by the picture generating unit 110 reaches the reflective polarizer, which reflects the linearly polarized light (S light) of the first polarization direction and transmits the linearly polarized light (P light) of the second polarization direction. The reflective polarizer reflects the linearly polarized light (S light) of the first polarization direction to a quarter-wave plate, which converts the linearly polarized light (S light) of the first polarization direction into circularly polarized light or elliptically polarized light, which is then emitted to the imaging unit 130. The imaging unit 130 reflects the received circularly polarized light or elliptically polarized light, which passes through the quarter-wave plate and is then converted into linearly polarized light (P light) of the second polarization direction. The linearly polarized light (P light) of the second polarization direction is then emitted to the human eye through the reflective polarizer to form a virtual image.

[0047] Here, an example is used for explanation in which the reflective polarizer is a polarizer that transmits P light and reflects S light. In another example, the reflective polarizer may alternatively be a polarizer that transmits S light and reflects P light.

[0048] In a third structure, the light path folding layer 121 includes a quarter-wave plate and a reflective polarizer. The quarter-wave plate and the reflective polarizer are sequentially arranged on the optical path of the image light emitted by the picture generating unit 110 and the imaging unit 130. For example, the reflective polarizer may be attached to the surface of the inorganic glass 122. For example, the reflective polarizer and the quarter-wave plate may be integrally formed and then bonded to the surface of the inorganic glass 122, or the reflective polarizer and the quarter-wave plate may be sequentially bonded to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer may be an optical adhesive layer or a pressure-sensitive adhesive layer included in the polarizer.

[0049] The circularly polarized or elliptically polarized light emitted by the picture generating unit 110 reaches the quarter-wave plate, which converts the circularly polarized or elliptically polarized light into linearly polarized light in a first polarization direction (S light). The reflective polarizer reflects the linearly polarized light in the first polarization direction (S light) from the quarter-wave plate back to the quarter-wave plate, which converts the linearly polarized light in the first polarization direction (S light) from the reflective polarizer back into circularly polarized or elliptically polarized light, and then emits the circularly polarized or elliptically polarized light to the imaging unit 130. The imaging unit 130 reflects the received circularly polarized or elliptically polarized light, which passes through the quarter-wave plate and is then converted into linearly polarized light in a second polarization direction (P light). The linearly polarized light in the second polarization direction (P light) then passes through the reflective polarizer and is emitted to the human eye, forming a virtual image.

[0050] Here, an example is used for explanation in which the reflective polarizer is a polarizer that transmits P light and reflects S light. In another example, the reflective polarizer may alternatively be a polarizer that transmits S light and reflects P light.

[0051] In the fourth structure, the light path folding layer 121 includes a quarter-wave plate, a reflective polarizer, and an absorptive polarizer. The quarter-wave plate, the reflective polarizer, and the absorptive polarizer are sequentially arranged on the optical path of the image light emitted by the picture generating unit 110 and the imaging unit 130. The light transmission axis direction of the reflective polarizer is the same as the light transmission axis direction of the absorptive polarizer. For example, the absorptive polarizer, the reflective polarizer, and the quarter-wave plate may be integrally formed and then bonded to the surface of the inorganic glass 122, or the absorptive polarizer, the reflective polarizer, and the quarter-wave plate may be sequentially bonded to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer may be an optical adhesive layer or a pressure-sensitive adhesive layer included in the polarizer.

[0052] The circularly or elliptically polarized light emitted by the picture generating unit 110 is converted to linearly polarized light in a first polarization direction using a quarter-wave plate. The reflective polarizer reflects most of the linearly polarized light in the first polarization direction from the quarter-wave plate back to the quarter-wave plate. The quarter-wave plate converts the linearly polarized light in the first polarization direction from the reflective polarizer back to circularly or elliptically polarized light, which is then emitted to the imaging unit 130. The absorbing polarizer is configured to absorb the linearly polarized light in the first polarization direction that passes through the reflective polarizer. The imaging unit 130 reflects the received circularly or elliptically polarized light, which passes through the quarter-wave plate and is then converted to linearly polarized light in a second polarization direction. The linearly polarized light in the second polarization direction then passes through the reflective polarizer and the absorbing polarizer in sequence and is emitted to the human eye, forming a virtual image. The absorbing polarizer is positioned to prevent the image light emitted by the picture generating unit 110 from directly entering the human eye and forming a real image, which avoids interference with the virtual image and improves the user's viewing effect.

[0053] It should be noted that in the embodiments of the present application, the polarizer may also be referred to as a polarizing sheet. The polarization direction of the reflective polarizer is the same as that of the absorptive polarizer, both of which are in the second polarization direction. In this way, the reflective polarizer is configured to reflect linearly polarized light in a first polarization direction and transmit linearly polarized light in a second polarization direction, while the absorptive polarizer is configured to absorb linearly polarized light in the first polarization direction and transmit linearly polarized light in a second polarization direction. The first polarization direction is perpendicular to the second polarization direction. For example, linearly polarized light in the first polarization direction is S light, and linearly polarized light in the second polarization direction is P light. Alternatively, linearly polarized light in the first polarization direction is P light, and linearly polarized light in the second polarization direction is S light.

[0054] In the fifth structure, the folding layer 121 includes a semi-transmissive semi-reflective film, a first quarter-wave plate, and an absorptive polarizer, which are sequentially arranged on the optical path of the image light emitted by the picture generating unit 110 and the image light emitted by the imaging unit 130. In this case, the folding unit 120 further includes a second quarter-wave plate arranged on the optical path between the imaging unit 130 and the folding layer 121.

[0055] For example, the absorptive polarizer, the quarter-wave plate, and the transflective film may be integrally formed and then bonded to the surface of the inorganic glass 122, or the absorptive polarizer and the quarter-wave plate having the transflective film formed on its surface may be sequentially bonded to the surface of the inorganic glass 122 using an adhesive layer. Here, the adhesive layer may be an optical adhesive layer or a pressure-sensitive adhesive layer included in the polarizer.

[0056] A portion of the circularly polarized or elliptically polarized light (left-handed optical rotation) emitted by the picture generating unit 110 passes through the semi-transmissive / semi-reflective film and is emitted to the first quarter-wave plate, where it passes through the first quarter-wave plate and is then converted into linearly polarized light with a first polarization direction (S light). The linearly polarized light with the first polarization direction is then emitted to the absorbing polarizer. The absorbing polarizer absorbs the linearly polarized light with the first polarization direction (S light). The absorbing polarizer is positioned to prevent the image light emitted by the picture generating unit 110 from directly entering the human eye and forming a real image. This avoids interference with virtual images and improves the user's viewing experience.

[0057] Another portion of the circularly polarized or elliptically polarized light (left-handed optical rotation) emitted by the picture generating unit 110 is reflected by the semi-transmissive semi-reflective film to the second quarter-wave plate, passes through the second quarter-wave plate, and is then converted into linearly polarized light (S light) in the second polarization direction. The imaging unit 130 then reflects the linearly polarized light (S light) in the second polarization direction back to the second quarter-wave plate. The linearly polarized light (S light) in the second polarization direction passes through the second quarter-wave plate and is converted into circularly polarized or elliptically polarized light (right-handed optical rotation), which is then emitted to the semi-transmissive semi-reflective film. A portion of the circularly polarized or elliptically polarized light (right-handed optical rotation) passes through the semi-transmissive semi-reflective film, is then emitted to the first quarter-wave plate, passes through the first quarter-wave plate, and is then converted into linearly polarized light (P light) in the second polarization direction. The linearly polarized light in the second polarization direction (P light) passes through the absorptive polarizer and is emitted to the human eye, forming a virtual image.

[0058] In the sixth structure, the folding layer 121 includes a semi-transmissive film and an absorptive polarizer, which are sequentially arranged on the optical path of the image light emitted by the picture generating unit 110 and the image light emitted by the imaging unit 130. In this case, the folding unit 120 further includes a quarter-wave plate arranged on the optical path between the imaging unit 130 and the folding layer 121. For example, the semi-transmissive film and the absorptive polarizer may be integrally formed and then bonded to the surface of the inorganic glass 122.

[0059] After passing through the semi-transmissive semi-reflective film, a portion of the linearly polarized light (S light) of the first polarization direction emitted by the picture generating unit 110 is absorbed by the absorbing polarizer. The absorbing polarizer is positioned to prevent the image light emitted by the picture generating unit 110 from directly entering the human eye and forming a real image. This avoids interference with the virtual image and improves the user's viewing experience.

[0060] Another portion of the linearly polarized light (S light) in the first polarization direction emitted by the picture generating unit 110 is reflected by the semi-transmissive semi-reflective film to the quarter-wave plate, which converts the received linearly polarized light (S light) in the first polarization direction into circularly polarized light or elliptically polarized light, which is then 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, which passes through the quarter-wave plate and is converted into linearly polarized light in the second polarization direction (P light). A portion of the linearly polarized light in the second polarization direction (P light) passes through the semi-transmissive semi-reflective film and the absorptive polarizer in order, and is emitted to the human eye, forming a virtual image.

[0061] For example, the thickness of the inorganic glass 122 is 0.2 mm or more 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 the related art, the thickness of the inorganic glass is more than 2 mm, and the large thickness results in a large weight of the display device. The thickness of the inorganic glass can be reduced, thereby reducing the weight of the display device.

[0062] Optionally, the organic board 123 may be a single-layer structure or a multi-layer composite structure. Any layer in the organic board 123 may use the following materials: acrylic (i.e., polymethyl methacrylate (PMMA) (also known as Plexiglas)), polycarbonate (PC), polyvinyl chloride (PVC), polystyrene (PS), and allyl diglycol carbonate (ADC, commonly known as CR-39). In some examples, the organic board 123 is a composite board including an acrylic board and a PC board.

[0063] For example, the thickness of the organic plate 123 is 1 mm to 2 mm.

[0064] The display device provided in the embodiment of the present application is particularly applicable to an in-vehicle display scenario, since the in-vehicle display scenario has higher requirements for the crashworthiness of the display device. The thickness of the inorganic glass 122 and the thickness and material of the organic plate 123 are selected so that the relevant regulations for crashworthiness tests can be complied with.

[0065] In an embodiment of the present application, the light transmittance of the organic plate 123 may be set based on actual requirements, for example, 50% to 100%, for example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. When the light transmittance of the organic plate 123 is low, the intensity of ambient light passing through the organic plate 123 and reaching the folding layer 121 is reduced, thereby correspondingly reducing the intensity of ambient light reflected by the folding layer 121. Therefore, the reflection of ambient light at the folding unit can be reduced, and the user experience can be improved.

[0066] In some examples, at least one layer of the organic plate 123 is doped with light-absorbing particles and / or the organic plate 123 is subjected to a surface treatment (e.g., a roughening treatment), thereby achieving light transmittance of the organic plate 123. The type of light-absorbing particles is not limited in the embodiments of the present application, as long as the light transmittance of the organic plate 123 can be reduced.

[0067] Optionally, the organic plate 123 may be colored, for example gray, blue, or dark brown, or the organic plate 123 may be colorless.

[0068] Optionally, the organic plate 123 may be glued to the inorganic glass 122 using an optical adhesive layer.

[0069] The picture generation unit 110 may be a direct-imaging image source, such as an LCD, an organic light-emitting diode (OLED) display, or an LED display, where the LED display may be a micro LED display or a mini LED display, etc.

[0070] In some other examples, the picture generation unit 110 includes a projection imaging image source, which may be an optical engine (also referred to as a picture generation unit (PGU)). The optical engine includes a light source and a reflective spatial light modulator. The light source is configured to generate a light beam, and the reflective spatial light modulator is configured to modulate and reflect the light beam to form image light. For example, the reflective spatial light modulator includes an LCoS modulator or a MEMS modulator. Optionally, in addition to the optical engine, the picture generation unit 110 further includes a diffusion screen (not shown). The diffusion screen is configured to receive the light beam output by the optical engine and diffuse the received light beam (e.g., perform diffuse reflection on the received light beam) to improve imaging quality.

[0071] As long as the picture generation unit 110 can provide the aforementioned image light, the structure of the picture generation unit 110 is not limited in this application.

[0072] Optionally, when the light beam provided by the picture generation unit 110 is a two-dimensional image light, the virtual image viewed by the user is a two-dimensional image. Alternatively, when the light beam provided by the picture generation unit 110 is a three-dimensional image light, the virtual image viewed by the user is a three-dimensional image.

[0073] In some examples, the image light emitted by the picture generation unit 110 may be linearly polarized, circularly polarized, or elliptically polarized.

[0074] When the polarization state of the image light emitted by the image source in the picture generation unit 110 is different from the target polarization state required by the picture generation unit 110, the picture generation unit 110 may further include a polarization state conversion element configured to convert the image light generated by the image source to the target polarization state. The polarization state conversion element includes, but is not limited to, a quarter-wave plate, a P polarizing sheet, an S polarizing sheet, or a combination thereof (e.g., a quarter-wave plate and a P polarizing sheet, or a quarter-wave plate and an S polarizing sheet). For example, a quarter-wave plate is disposed on the surface of an LCD, so that the image light emitted by the LCD can be converted into circularly polarized light or elliptically polarized light.

[0075] In some examples, imaging unit 130 includes an opaque reflective imaging element, such as a curved reflective mirror (e.g., a metallic curved reflective mirror). In some other examples, imaging unit 130 includes a transparent reflective imaging element, such as a lens, a lens group including multiple lenses, or a transparent curved mirror. When imaging unit 130 uses an opaque reflective imaging element, the display device is a virtual reality (VR) display device. When imaging unit 130 uses a transparent reflective imaging element, the display device is an augmented reality (AR) display device.

[0076] Optionally, the imaging unit 130 may further 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 spaced apart from the reflective imaging element.

[0077] 4, the light output surface of the picture generation unit 110 faces the light path folding unit 120. The image light emitted by the picture generation unit 110 is reflected by the light path folding unit 120 to the imaging unit 130, and then the imaging unit 130 reflects the image light from the light path folding unit 120 back to the light path folding unit 120, and finally the image light is emitted from the light path folding unit 120. The number of times the image light is reflected inside the display device is reduced, which helps to improve light efficiency.

[0078] In another embodiment, the light output surface of the picture generation unit 110 faces the imaging unit 130. The image light emitted by the picture generation unit 110 is reflected by the imaging unit 130 to the light path folding unit 120, then reflected by the light path folding unit 120 to the imaging unit 130, then reflected by the imaging unit 130 back to the light path folding unit 120, and then emitted. In this example, the image distortion is small in the display process, and the picture quality of the virtual image is good.

[0079] 4 shows an example in which the picture generation unit 110 is disposed above the imaging unit 130, and both the picture generation unit 110 and the imaging unit 130 are disposed to the right (away from the user) of the optical path folding unit 120. In practical applications, the picture generation unit 110 may alternatively be disposed below the imaging unit 130.

[0080] FIG. 5 is a diagram of the structure of the light path folding unit 120 according to one embodiment of the present application. As shown in FIG. 5, the light path folding unit 120 includes a light path folding layer 121, inorganic glass 122, an anti-reflection layer 124, and an organic plate 123, which are sequentially stacked along the output light path of the imaging unit 130 (the direction indicated by the arrow in FIG. 5). The anti-reflection layer 124 is configured to reduce reflection of ambient light on the outer surface of the display device. The anti-reflection layer 124 may include at least two polarization state conversion layers. The at least two polarization state conversion layers are used to control the polarization state of ambient light entering the light path folding unit, thereby reducing reflection of ambient light, and the display area of ​​the display device in a non-operating state is dark, for example, black.

[0081] For example, the anti-reflection layer 124 includes a quarter-wave plate 1241, a first linear polarizer 1242, and a second linear polarizer 1243, which are sequentially stacked along the output optical path of the imaging unit 130. An angle is formed between the light transmission axis of the first linear polarizer 1242 and the light transmission axis of the second linear polarizer 1243, and this angle is 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 of the present application, 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, so the quarter-wave plate 1241, the first linear polarizer 1242, and the second linear polarizer 1243 may also be referred to as polarization state conversion layers.

[0082] The light component of the ambient light having a first polarization direction (same as the light transmission axis direction of the second linear polarizer 1243) passes through the second linear polarizer 1243, and then the light component of the first polarization direction having a second polarization direction (same as the light transmission axis direction of the first linear polarizer 1242) passes through the first linear polarizer 1242. Because there is an angle between the light transmission axis of the first linear polarizer 1242 and the light transmission axis of the second linear polarizer 1243, the intensity of the light component of the second polarization direction is lower than the intensity of the light component of the first polarization direction. After passing through the quarter-wave plate 1241, the light component of the second polarization direction is converted into left-handed (or right-handed) optical rotation. The left-handed optical rotation then passes through the inorganic glass 122, reaches the folding layer 121, is reflected by the folding layer 121, and is then converted into right-handed (or left-handed) optical rotation. After passing through the quarter-wave plate 1241, the right-handed light is converted into linearly polarized light with a third polarization direction. The third polarization direction is perpendicular to the second polarization direction, and linearly polarized light with the third polarization direction 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 is first used to reduce the intensity of ambient light to further reduce the ambient light entering the display device. In cooperation with the circular polarizer, the ambient light reflected back by the display device can be further reduced or even completely eliminated.

[0083] Alternatively, in another embodiment, the anti-reflection layer 124 may include only the quarter wave plate 1241 and the first linear polarizer 1242 without the second linear polarizer 1243 .

[0084] Due to the material properties of the organic plate 123, the phase of light changes after passing through the organic plate 123. If the organic plate 123 is disposed between any two polarization state conversion layers in the anti-reflection layer 124, for example, between the quarter-wave plate 1241 and the first linear polarizer 1242, or between the anti-reflection layer 124 and the inorganic glass 122, the anti-reflection effect of the anti-reflection layer 124 will be adversely affected. Therefore, in the embodiment of the present application, the anti-reflection layer 124 is disposed between the organic plate 123 and the inorganic glass 122 to ensure the reflectance-reducing effect of the anti-reflection layer 124. In addition, the organic plate 123 is disposed on the side of the anti-reflection layer 124 farther from the inorganic glass 122 to protect the anti-reflection layer 124.

[0085] Optionally, there is an optical adhesive layer between the inorganic glass 122 and the organic plate 123 .

[0086] For example, a linear polarizer may include a first triacetyl cellulose (TAC) layer, a polyvinyl alcohol (PVA) layer, a second TAC layer, and a pressure-sensitive adhesive (PSA) layer, stacked in sequence. The first and second TAC layers provide support and protection and can prevent shrinkage of the linear polarizer. The PVA layer is configured to polarize light. The PSA layer is configured to attach the linear polarizer to another structure.

[0087] Because the surface of the polarizer (i.e., the surface on which the PSA layer is disposed) is adhesive, the polarizer can be directly attached to an adjacent layer structure. The non-adhesive surface of the polarizer may be adhered to the adjacent layer structure using an optically clear adhesive.

[0088] 5, the surface of the second linear polarizer 1243 is adhered to the organic plate 123 using an optical adhesive layer 126. In another embodiment, the surface of the circular polarizer may alternatively be adhered to the inorganic glass 122 using an optical adhesive layer.

[0089] For example, the optical transmittance of the optical adhesive layer is 50% to 100%, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%.

[0090] When the optical adhesive layer has low light transmittance, the intensity of the ambient light reaching the folding layer 121 is reduced, which in turn reduces the intensity of the ambient light reflected by the folding layer 121 accordingly. Therefore, the reflection of the ambient light in the folding unit can be reduced, improving the user experience. The optical transparent adhesive is doped with light-absorbing particles, which can control the light transmittance of the optical adhesive layer. The type and doping amount of the light-absorbing particles are not limited in the embodiments of the present application.

[0091] The optical path folding unit further includes an optical film 125. The optical film 125 is disposed on the side of the organic plate 123 away from the inorganic glass 122, and the optical film 125 includes at least one of an AR film and an anti-glare film. The optical film 125 can further reduce the reflection of ambient light in the optical path folding unit, thereby improving the user experience.

[0092] Optionally, the display device further includes a housing (not shown). The housing has an observation window facing the user's eyes, allowing the user to view a virtual image. Both the picture generation unit 110 and the imaging unit 130 are disposed within the housing, the light path folding unit 120 is disposed at the observation window, and the organic plate 123 is closer to the outside of the housing than the inorganic glass 122. In this way, the housing can protect the units, and the units are integrated with each other using the housing to facilitate overall movement of the display device.

[0093] The shape of the housing is not limited in the embodiments of the present disclosure and may be a rectangular parallelepiped, a cylinder, etc. In addition, when the display device is incorporated into a large product, for example, when incorporated into a seat of a means of transportation, the seat may be used to provide a accommodating cavity, and the picture generating unit 110 and the imaging unit 130 are directly disposed in the accommodating cavity, and the optical path folding unit 120 is disposed at the opening of the accommodating cavity, so that the housing can be omitted.

[0094] Optionally, the display device may further include a host processor, the host processor configured to send the image data to the picture generation unit.

[0095] Optionally, the display device further comprises a power supply for providing power to the host processor and the picture generation unit.

[0096] 6 is a circuit diagram of a display device according to an embodiment of the present application. As shown in FIG. 6, the circuit in the display device mainly includes a host processor (host CPU) 1101, an external memory interface 1102, an internal memory 1103, an audio module 1104, a video module 1105, a power module 1106, a wireless communication module 1107, an I / O interface 1108, a video interface 1109, and a display circuit 1110. The host processor 1101 and its peripheral components, such as the external memory interface 1102, the internal memory 1103, the audio module 1104, the video module 1105, the power module 1106, the wireless communication module 1107, the I / O interface 1108, the video interface 1109, and the display circuit 1110, may be connected via a bus. The host processor 1101 may be referred to as a front-end processor.

[0097] Additionally, the circuit diagrams in this embodiment of the present application do not constitute any particular limitations on the display device. In some other embodiments of the present application, the display device may include more or fewer components than those shown in the diagram, some components may be combined, some components may be divided, or different components may be arranged. The components shown in the diagram may be implemented by hardware, software, or a combination of software and hardware.

[0098] The host processor 1101 includes one or more processing units. For example, the host processor 1101 may include 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). The different processing units may be separate components or may be integrated into one or more processors.

[0099] Memory may also be located in the host processor 1101 and configured to store computer instructions and data. In some embodiments, the memory in the host processor 1101 is a cache. The memory may store instructions or data that have just been used or that are used periodically by the host processor 1101. When the host processor 1101 needs to use the instructions or data again, the host processor may retrieve the instructions or data directly from the memory. This avoids repeated accesses and reduces the latency of the host processor 1101, thereby improving system efficiency.

[0100] In some embodiments, the display device may further include a plurality of input / output (I / O) interfaces 1108 connected to the host processor 1101. The I / O interfaces 1108 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 I / O interfaces 1108 may be connected to devices such as a mouse, touchpad, keyboard, camera, speaker / horn, or microphone, or may be connected to physical buttons on the display device (e.g., volume buttons, brightness buttons, or power on / off button).

[0101] The external memory interface 1102 may be configured to connect to an external memory card, such as a Micro SD card, to expand the storage capabilities of the display device. The external memory card communicates with the host processor 1101 via the external memory interface 1102 to perform data storage functions.

[0102] The internal memory 1103 may be configured to store computer-executable program code. The executable program code includes instructions. The internal memory 1103 may include a program storage area and a data storage area. The program storage area may store an operating system and applications required by at least one function (e.g., a call function or a time setting function). The data storage area may store data created in the process of using the display device (e.g., a phone book and world time). In addition, the internal memory 1103 may include high-speed random access memory or non-volatile memory, such as at least one magnetic disk storage device, flash memory component, or universal flash storage (UFS). The host processor 1101 executes instructions stored in the internal memory 1103 and / or instructions stored in memory located within the host processor 1101 to perform various functional applications and data processing of the display device.

[0103] The display device may use an audio module 1104 and an application processor or the like to perform audio functions, such as playing music and making calls.

[0104] The audio module 1104 is configured to convert digital audio information into analog audio signals for output, and is also configured to convert analog audio input into digital audio signals. The audio module 1104 may be further configured to encode and decode audio signals, for example, for audio playback or audio recording. In some embodiments, the audio module 1104 may be located within the host processor 1101, or some functional modules within the audio module 1104 are located within the host processor 1101.

[0105] The video interface 1109 may receive externally input audio and video signals, specifically, a high definition multimedia interface (HDMI), a digital visual interface (DVI), a video graphics array (VGA), a display port (DP), or the like. Alternatively, the video interface 1109 may output video. When the display device is used as a head-up display, the video interface 1109 may receive a speed signal and a power signal input by a peripheral device and may also receive an externally input AR video signal. When the display device is used as a desktop display, the video interface 1109 may receive a video signal input by an external computer or terminal device.

[0106] The video module 1105 may decode the video input via the video interface 1109, for example, performing H.264 decoding. The video module may further encode the video collected by the display device, for example, performing H.264 encoding on video collected by an external camera. In addition, the host processor 1101 may also decode the video input via the video interface 1109 and then output the image signal obtained by decoding to the display circuit 1110.

[0107] The display circuit 1110 is configured to drive the picture generation unit 110 to display corresponding images. In this embodiment, the video interface 1109 receives an externally input video source signal, and the video module 1105 performs decoding and / or digitization processing and outputs one or more image signals to the display circuit 1110. The display circuit 1110 drives the picture generation unit 110 to form an image based on the input image signal, and then outputs image light. In addition, the host processor 1101 may also output an image signal to the display circuit 1110. In addition, the display circuit 1110 may also drive the picture generation unit 110 to display an interactive image based on the input image signal.

[0108] The host processor 1101 may control the picture generation unit 110 to display images by executing computer instructions.

[0109] The power module 1106 is configured to supply power to the host processor 1101 and the picture generation unit 110 based on an input power (e.g., direct current). The power module 1106 may include a rechargeable battery, which may supply power to the host processor 1101 and the picture generation unit 110.

[0110] The wireless communication module 1107 may enable the display device to communicate wirelessly with the outside world and may provide wireless communication solutions such as wireless local area networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite systems (GNSS), frequency modulation (FM), near field communication (NFC) technology, and infrared (IR) technology. The wireless communication module 1107 may be one or more components incorporating at least one communication processor module. The wireless communication module 1107 receives electromagnetic waves via an antenna, performs frequency modulation and filtering on the electromagnetic wave signals, and transmits the processed signals to the host processor 1101. The wireless communication module 1107 may further receive signals to be transmitted from the host processor 1101, perform frequency modulation and amplification on the signals, and convert the processed signals into electromagnetic waves for emission via the antenna.

[0111] Furthermore, in addition to being input via the video interface 1109, the video data decoded by the video module 1105 may further be received wirelessly via the wireless communication module 1107 or read from an external memory. For example, the display device may receive video data from a terminal device or an in-vehicle infotainment system via a wireless local area network within the vehicle, and the display device may further read audio and video data stored in an external memory.

[0112] An embodiment of the present application further provides a vehicle, the vehicle including any one of the display devices described above.

[0113] FIG. 7 is a diagram of vehicle functionality according to one embodiment of the present application.

[0114] The vehicle may include various subsystems, such as a sensor system 21, a control system 22, one or more peripheral devices 23 (one is used as an example in the figure), a power supply 24, a computer system 25, and a display system 26, and the aforementioned subsystems may communicate with each other. The display system 26 may include a display device provided in an embodiment of the present application. The vehicle may further include other functional systems, such as an engine system that powers the vehicle, and a cockpit, which are not limited here in the present application.

[0115] The sensor system 21 may include several detection devices. The detection devices can sense measured information and convert the sensed information into an electrical signal or another form of information required for output according to certain rules. As shown in FIG. 7, these detection devices may include a Global Positioning System (GPS), a vehicle speed sensor, an Inertial Measurement Unit (IMU), a radar unit, a laser range finder, a camera device, a wheel speed sensor, a steering sensor, a gear sensor, or another element used for automatic detection. This is not limited in this application.

[0116] The control system 22 may include several elements, such as a steering unit, a brake unit, a lighting system, an autonomous driving system, a map navigation system, a network timing system, and an obstacle avoidance system, as shown in the figure. The control system 22 may receive information (such as vehicle speed and vehicle distance) transmitted by the sensor system 21 to perform functions such as autonomous driving and map navigation.

[0117] Optionally, the control system 22 may further include elements such as a throttle controller and an engine controller configured to control the driving speed of the vehicle, which is not limited in this application.

[0118] The peripheral device 23 may include several elements, such as a communication system, a touch screen, a user interface, a microphone, and a speaker. The communication system is configured to implement network communication between the vehicle and a device other than the vehicle. In actual use, the communication system may implement network communication between the vehicle and another device using wireless communication technology or wired communication technology. Wired communication technology may mean that the vehicle communicates with another device via a network cable, optical fiber, or the like.

[0119] The power source 24 represents a system that provides power or energy to the vehicle and may include, but is not limited to, a rechargeable lithium battery or a lead-acid battery. In actual use, one or more battery components within the power source are configured to provide electrical energy or energy to start the vehicle. The type and material of the power source are not limited in this application.

[0120] The implementation of some functions of the vehicle may be controlled by a computer system 25. The computer system 25 may include one or more processors 2501 (one processor is shown in the figure as an example) and a memory 2502 (also called a storage device). In actual use, the memory 2502 may also be internal to the computer system 25 or external to the computer system 25, for example, used as a cache for the vehicle. This is not a limitation of the present application.

[0121] Processor 2501 may include one or more general-purpose processors, such as a graphics processing unit (GPU), and may be configured to execute associated programs, or instructions corresponding to programs, stored in memory 2502 to perform corresponding functions of the vehicle.

[0122] The memory 2502 may include a volatile memory, such as a RAM. Alternatively, the memory may include a non-volatile memory, such as a ROM, a flash memory, a HDD, or a solid-state drive (SSD). Alternatively, the memory 2502 may include a combination of the aforementioned types of memory. The memory 2502 may be configured to store a program code or a set of instructions corresponding to the program code, so that the processor 2501 calls the program code or instructions stored in the memory 2502 to perform corresponding functions of the vehicle. In the present application, the memory 2502 may store a set of program code used for vehicle control. The processor 2501 may control the safe driving of the vehicle by calling the program code. A method for performing the safe driving of the vehicle will be described in detail below in the present application.

[0123] Optionally, in addition to storing program code or instructions, memory 2502 may further store information such as road maps, driving routes, and sensor data. Computer system 25 may cooperate with other elements in the vehicle's functional framework diagram, such as sensors in the sensor system and GPS, to perform related functions of the vehicle. For example, computer system 25 may control the driving direction or driving speed of the vehicle based on data input from sensor system 21. This is not a limitation of the present application.

[0124] The display system 26 may interact with other systems in the vehicle, for example, the display system 26 may display navigation information transmitted by the control system 22 or play videos transmitted by the computer system 25 and the peripheral devices 23. For the specific structure of the display system 26, please refer to the above-mentioned embodiment of the display device, and the details will not be described again here.

[0125] In this embodiment, the four subsystems shown in the figure, namely, the sensor system 21, the control system 22, the computer system 25, and the display system 26, are merely examples and do not constitute limitations. In actual use, the vehicle may combine several elements in the vehicle based on different functions to obtain subsystems with corresponding different functions. In actual use, the vehicle may include more or fewer subsystems or elements, which is not a limitation in this application.

[0126] The vehicle in this embodiment of the present application may be a known vehicle, such as a car, an airplane, a ship, or a rocket, or may be a new vehicle that will appear in the future. The vehicle may be an electric vehicle, a fuel vehicle, or a hybrid-powered vehicle, such as a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, or a new energy vehicle. This is not specifically limited in the present application.

[0127] Unless otherwise defined, technical or scientific terms used herein shall have the common meaning understood by one of ordinary skill in the art to which this disclosure pertains. Terms such as "first," "second," and "third," as used in the specification and claims of this patent application, are not intended to denote order, number, or importance, but are intended to distinguish between different components. Similarly, terms such as "one" and "an" are not intended to denote a quantity limitation, but are intended to indicate the presence of at least one.

[0128] The foregoing description is only one embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, or improvement made without departing from the principle of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0129] 21 Sensor System 22 Control System 23 Peripheral Devices 24 Power supply 25 Computer Systems 26 Display System 100a display 100b TV 100c in-car display 110 Picture Generation Unit 120 Optical path return unit 121 Optical path folding layer 122 Inorganic Glass 123 Organic board 124 Anti-reflection layer 125 Optical Film 126 Optical adhesive layer 130 Imaging unit 1101 Host Processor 1102 External Memory Interface 1103 Internal Memory 1104 Audio Module 1105 Video Module 1106 Power Module 1107 Wireless Communication Module 1108 I / O Interface 1109 Video Interface 1110 Display circuit 1241 1 / 4 wave plate 1242 First linear polarizer 1243 Second Linear Polarizer 2501 processor 2502 memory S1 Virtual Image

Claims

1. A display device, the display device comprising: a picture generation unit, an optical path folding unit, and an imaging unit; the picture generation unit is configured to emit image light; the optical path folding unit is configured to guide the image light from the picture generation unit to the imaging unit; the imaging unit is configured to form a virtual image based on the image light from the optical path folding unit; The display device, wherein the light path turning unit includes a light path turning layer, inorganic glass, and an organic plate, which are stacked in order along the output light path of the imaging unit.

2. 2. The display device according to claim 1, wherein the optical path folding unit further comprises an anti-reflection layer, the anti-reflection layer comprising at least two polarization state conversion layers, and the anti-reflection layer is disposed between the inorganic glass and the organic plate.

3. the anti-reflection layer comprises a quarter-wave plate, a first linear polarizer, and a second linear polarizer stacked in sequence along the output light path of the imaging unit; or The display device of claim 2 , wherein the anti-reflection layer comprises a quarter-wave plate and a first linear polarizer stacked in sequence along the output light path of the imaging unit.

4. The light-folding layer is a semi-transmissive semi-reflective film, or the folding layer comprises a quarter wave plate and a reflective polarizer stacked in sequence along the output optical path of the imaging unit; or 2. The display device of claim 1, wherein the light path folding layer comprises a quarter-wave plate, a reflective polarizer, and an absorptive polarizer stacked in sequence along the output light path of the imaging unit, and the light transmission axis direction of the reflective polarizer is the same as the light transmission axis direction of the absorptive polarizer.

5. The display device according to claim 1 , wherein the light transmittance of the organic plate is 50% to 100%.

6. 10. The display device of claim 1, wherein the organic plate comprises at least one of the following: an acrylic plate, a polycarbonate plate, a polyvinyl chloride plate, polystyrene, and allyl diglycol carbonate.

7. 2. The display device according to claim 1, wherein the organic plate has a thickness of 1 mm to 2 mm.

8. 2. The display device according to claim 1, wherein an optical adhesive layer is present between the light path folding layer and the inorganic glass, and / or an optical adhesive layer is present between the inorganic glass and the organic plate.

9. The display device according to claim 8 , wherein the optical adhesive layer has a light transmittance of 50% to 100%.

10. The display device according to claim 1 , wherein the inorganic glass has a thickness of 0.2 mm or more and less than 2 mm.

11. 2. The display device of claim 1, wherein the optical path folding unit further comprises an optical film, the optical film being arranged on a side of the organic plate farther from the inorganic glass, and the optical film comprising at least one of the following: an anti-reflection film and an anti-glare film.

12. The display device of claim 1 , wherein the picture generation unit comprises a direct-imaging image source or a projected-imaging image source.

13. 13. The display device of claim 12, wherein the direct-imaging image source comprises 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.

14. 13. The display device of claim 12, wherein the projection imaging image source comprises an illumination source and a spatial light modulator, the illumination source configured to generate a light beam, and the spatial light modulator configured to modulate and reflect the light beam to obtain the image light.

15. 15. The display of claim 14, wherein the spatial light modulator comprises a liquid crystal on silicon LCoS modulator or a micro-electromechanical system MEMS modulator.

16. The display device of claim 1 , wherein the picture generating unit further comprises a polarization state converting element.

17. The display device of claim 1 , wherein the imaging unit comprises a curved reflector.

18. The display device of claim 1 , wherein the display device comprises a processor, the processor configured to send image data to the picture generation unit.

19. The display device of claim 1 , wherein the display device comprises a housing, the picture generating unit and the imaging unit are disposed within the housing, the housing has an observation window, and the optical path folding unit is disposed at the observation window.

20. A vehicle comprising a display device according to any one of claims 1 to 19, said display device being installed on said vehicle.

Images