Display device and transportation

Abstract

The present application discloses a display device and a vehicle, belonging to the field of display technology. The display device includes an image generating unit, an optical path folding unit and an imaging unit. The image generating unit is used to emit image light. The optical path folding unit is used to guide the image light from the image generating 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. Among them, the optical path folding unit includes an optical path folding layer, an inorganic glass and an organic plate stacked in sequence along the output light path of the imaging unit. The display device has high safety performance in collision scenarios.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a vehicle. Background Art

[0002] In people's daily lives, display devices are used more and more.

[0003] In the related art, 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 is used to guide 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 generally includes an optical path folding layer and inorganic glass which are sequentially located on the optical path of the imaging unit, and the optical path folding layer is attached to the inorganic glass and is used to transmit at least part of the imaging light from the imaging unit to the human eye. Thus, the user can see a virtual image.

[0004] However, in a collision scenario, inorganic glass is easy to break, posing a safety hazard. Summary of the invention

[0005] The present application provides a display device and a vehicle, which can improve the safety performance of the display device in a collision scenario.

[0006] On the one hand, the present 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 is used to emit image light. The optical path folding unit is used to guide the image light from the image generating 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, an inorganic glass and an organic plate stacked in sequence along the optical path of the imaging unit.

[0007] When the display device is in a collision scenario, the organic sheet arranged on the outer side of the inorganic glass can play a protective role, thereby improving the safety performance of the display device in the collision scenario. The display device is particularly suitable for vehicle-mounted display scenarios.

[0008] In order to further improve the user experience, the optical path folding component may also include an anti-reflection layer, which is used to reduce the reflection of ambient light from the outer surface of the display device. The anti-reflection layer may include at least two polarization state conversion layers, and the polarization state of the ambient light incident on the optical path folding unit is controlled by at least two polarization state conversion layers, which can reduce the reflection of the ambient light, so that the display area of ​​the display device appears dark, for example, black, when it is not in operation.

[0009] Since the organic plate has a delay effect on the phase of light, in order to avoid the adverse effect of the organic plate on the effect of the anti-reflection layer, all polarization state conversion layers in the anti-reflection layer can be arranged between the inorganic glass and the organic plate.

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

[0011] The first type, the anti-reflection layer includes a quarter wave plate, a first linear polarizer, and a second linear polarizer stacked in sequence along the outgoing light path of the imaging unit. The light transmission axis of the first linear polarizer and the light transmission axis of the second linear polarizer form an angle. By controlling the angle between the light transmission axis of the first linear polarizer and the light transmission axis of the second linear polarizer, the anti-reflection layer can control the weakening effect of the reflectivity of the ambient light. Here, the combination of the quarter wave plate and the first linear polarizer can be called a circular polarizer.

[0012] The second type is an anti-reflection layer comprising a quarter wave plate and a first linear polarizer stacked in sequence along the outgoing light path of the imaging unit.

[0013] Optionally, the optical path folding layer can adopt any one of the following structures: the first one, the optical path folding layer is a semi-transparent and semi-reflective film; the second one, the optical path folding layer includes a 1 / 4 wave plate and a reflective polarizer stacked in sequence along the output light path of the imaging unit; the third one, the optical path folding layer includes a 1 / 4 wave plate, a reflective polarizer and an absorptive polarizer stacked in sequence along the output light path of the imaging unit, and the transmission axis directions of the reflective polarizer and the absorptive polarizer are the same; the fourth one, the optical path folding layer includes a reflective polarizer, and the optical path folding unit also includes A 1 / 4 wave plate located on the optical path between the imaging unit and the optical path folding layer; a fifth type, the optical path folding layer includes a semi-transparent and semi-reflective film, a first 1 / 4 wave plate and an absorptive polarizer stacked in sequence along the exit optical path of the imaging unit, and the optical path folding unit also includes a second 1 / 4 wave plate located on the optical path between the imaging unit and the optical path folding layer; a sixth type, the optical path folding layer includes a semi-transparent and semi-reflective film and an absorptive polarizer stacked in sequence along the exit optical path of the imaging unit, and the optical path folding unit also includes a 1 / 4 wave plate located on the optical path between the imaging unit and the optical path folding layer.

[0014] The optical path folding layers of these six structures can all play the role of reflecting at least part of the image light from the image generating unit to the imaging unit, and transmitting at least part of the image light emitted by the imaging unit.

[0015] Optionally, the organic sheet is 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 sheets stacked together, and each layer can be an acrylic sheet, a polycarbonate sheet, or a polyvinyl chloride sheet.

[0016] Optionally, the light transmittance of the organic plate is 50% to 100%. By selecting a suitable light transmittance of the organic plate according to needs, the reflectivity of the screen of the display device to ambient light can be controlled.

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

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

[0019] Exemplarily, the thickness of the inorganic glass is greater than or equal to 0.2 mm and less than 2 mm, for example, 0.5 mm to 1 mm. The relatively small thickness of the inorganic glass is conducive to reducing the weight of the display device.

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

[0021] Optionally, an optical adhesive layer is provided between the inorganic glass and the organic plate. For example, when the anti-reflection layer is located between the inorganic glass and the organic plate, the organic plate and the anti-reflection layer are bonded by optical adhesive, or the inorganic glass and the anti-reflection layer are bonded by optical adhesive, so that an optical adhesive layer is provided between the inorganic glass and the organic plate. For another example, when the optical path folding unit does not include an anti-reflection layer, the inorganic glass and the organic plate may be bonded by an optical adhesive layer.

[0022] Optionally, the light transmittance of the optical adhesive layer is 50% to 100%. By selecting a suitable light transmittance of the optical adhesive layer according to needs, the reflectivity of the screen of the display device to ambient light can be controlled.

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

[0024] In some examples, the image generation unit includes a direct imaging image source or a projection imaging image source. Exemplarily, the direct imaging image source includes a liquid crystal display (LCD), an OLED display, or a light-emitting diode (LED) display, etc. The projection imaging image source includes an illumination light source and a reflective spatial light modulator, the illumination light source is used to generate a light beam, and the reflective spatial light modulator is used to modulate and reflect 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 also includes a diffusion screen for transmitting the image light and forming a real image. Exemplarily, the reflective spatial light modulator includes a liquid crystal on silicon (LCoS) modulator or a micro-electro-mechanical system (MEMS) modulator, etc.

[0025] 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. In this way, the type of image source can be arbitrarily selected as needed, which is more convenient to implement.

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

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

[0028] In some examples, the light emitting surface of the image generating unit is opposite to the light path folding unit. The image light emitted by the image generating unit is reflected to the imaging unit via the light path folding unit, and then the imaging unit reflects the image light from the light path folding unit to the light path folding unit, and finally emits from the light path folding unit. The image light has fewer reflections inside the display device, which is conducive to improving the light effect.

[0029] In other examples, the light emitting surface of the image generating unit is opposite to the imaging unit. The image light emitted by the image generating 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 during the display process, and the picture quality of the virtual image is good.

[0030] Optionally, the display device further comprises a housing. The housing has an observation window. The image generating unit and the imaging unit are both located in the housing. The light path folding unit is located at the observation window, and the organic sheet is located outside the housing. The housing can protect the various units, and the various units are integrated together through the housing to facilitate the overall movement of the display device.

[0031] Optionally, the display device further comprises a main processor. The main processor is used to send image data to the image generating unit, and the image generating unit is used to provide image light based on the received image data.

[0032] In some examples, the display device also includes a power supply for powering the main processor and the image generation unit.

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

[0034] On the other hand, the present application provides a display device. The structure of the display device is similar to that of the aforementioned display device, but the inorganic glass is replaced by another organic plate. The organic plate has good optical properties and has a small delay effect on the phase of light.

[0035] In another aspect, the present application provides a means of transport, the means of transport comprising any of the above-mentioned display devices. The display device is installed on the means of transport. Exemplarily, the means of transport includes but is not limited to a car, an airplane, a train or a ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of a display device in use provided by an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of another display device in use provided by an embodiment of the present application;

[0038] Figure 3 is a schematic diagram of a usage state of another display device provided in an embodiment of the present application;

[0039] Figure 4 is a structural schematic diagram of a display device provided in an embodiment of the present application;

[0040] Figure 5 is a structural schematic diagram of an optical path folding unit provided in an embodiment of the present application;

[0041] Figure 6 is a circuit diagram of a display device provided in an embodiment of the present application;

[0042] Figure 7It is a functional schematic diagram of a means of transportation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The display device provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. The display device can be used as a common display (e.g. Figure 1 100a in the figure) for office use, and can also be used as a television (for example Figure 2 100b) for home entertainment (as a TV), or can be used for in-vehicle display (for example Figure 3 As shown in 100c in the figure, the display device is installed on the seat of the vehicle, or installed on the dashboard of the vehicle), or can be made into a portable display device to facilitate 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.

[0044] Figure 4 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 4 As shown, the display device includes: an image generating unit 110, an optical path folding unit 120 and an imaging unit 130. The image generating unit 110 is used to emit image light. The optical path folding unit 120 is used to guide (e.g., reflect) the image light from the image generating unit 110 to the imaging unit 130. The imaging unit 130 is used to form a virtual image S1 based on the image light from the optical path folding unit 120.

[0045] In the embodiment of the present application, image light refers to a light beam carrying image information. The image light emitted by the image generation unit 110 is reflected by the light path folding unit 120 and reaches the imaging unit 130. The imaging unit 130 reflects the image light to the light path folding unit 120, and the light path folding unit 120 transmits the imaging light to the human eye, so that the user can see the virtual image. Here, the light path folding unit 120 can change the propagation direction of the image light emitted by the image generation unit 110, so that the propagation path of the image light is folded and reaches the imaging unit 130, thereby reducing the volume of the display device. In addition, the image light is reflected less times inside the display device, which is beneficial to improving the light efficiency.

[0046] like Figure 4 As shown, the optical path folding unit 120 includes an optical path folding layer 121, an inorganic glass 122, and an organic plate 123 which are sequentially stacked along the outgoing optical path of the imaging unit 130. When the display device is in a collision scene, the organic plate arranged outside the inorganic glass can play a protective role, thereby improving the safety performance of the display device in the collision scene.

[0047] In the embodiment of the present application, the light path folding layer 121 may also be referred to as a spectroscopic layer, which is used to reflect at least part of the image light from the imaging unit 110 to the imaging unit 130 , and transmit at least part of the image light from the imaging unit 130 .

[0048] The optical path folding layer 121 may adopt any of the following six structures:

[0049] First, the light path folding layer 121 is a semi-transparent and semi-reflective film. The ratio of the transmittance and reflectance of the semi-transparent and semi-reflective film (which can be called the splitting ratio) can be set according to actual needs, for example, the ratio of the transmittance and 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 the inorganic glass 122.

[0050] A portion of the image light (which may be circularly polarized light, elliptically polarized light, linearly polarized light, or non-polarized light) emitted by the image generating unit 110 is reflected by the semi-transparent and semi-reflective membrane to the imaging unit 130. The imaging unit 130 reflects the received image light back to the semi-transparent and semi-reflective membrane, and a portion of the image light is emitted through the semi-transparent and semi-reflective membrane to the human eye, forming a virtual image.

[0051] Second, the optical path folding layer 121 includes a reflective polarizer, which is located on the optical path of the image light emitted by the image generating unit 110 and on the optical path of the image light emitted by the imaging unit 130. The optical path folding unit 120 also includes a 1 / 4 wave plate located on the optical path between the imaging unit 130 and the optical path folding layer 121. Exemplarily, the reflective polarizer can be attached to the surface of the inorganic glass 122.

[0052] The linear polarized light (S light) of the first polarization direction emitted by the image generating unit 110 reaches the reflective polarizer, which reflects the linear polarized light (S light) of the first polarization direction and transmits the linear polarized light (P light) of the second polarization direction. The reflective polarizer reflects the linear polarized light (S light) of the first polarization direction to the 1 / 4 wave plate, which converts the linear polarized light (S light) of the first polarization direction into circular polarized light or elliptically polarized light and then emits it to the imaging unit 130. The imaging unit 130 reflects the received circular polarized light or elliptically polarized light, which is converted into linear polarized light (P light) of the second polarization direction after passing through the 1 / 4 wave plate, and then is emitted to the human eye through the reflective polarizer to form a virtual image.

[0053] Here, the reflective polarizer is taken as an example of a polarizer that transmits P light and reflects S light. In other examples, the reflective polarizer may also be a polarizer that transmits S light and reflects P light.

[0054] Third, the optical path folding layer 121 includes a quarter wave plate and a reflective polarizer, which are sequentially located on the optical path of the image light emitted by the image generating unit 110 and sequentially located on the optical path of the image light emitted by the imaging unit 130. Exemplarily, the reflective polarizer can be pasted on the surface of the inorganic glass 122. Exemplarily, the reflective polarizer and the quarter wave plate can be integrally manufactured and then bonded to the surface of the inorganic glass 122, or the reflective polarizer and the quarter wave plate can be sequentially bonded to the surface of the inorganic glass 122 through an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer provided by the polarizer.

[0055] The circularly polarized light or elliptically polarized light emitted by the image generating unit 110 reaches the 1 / 4 wave plate, and the 1 / 4 wave plate converts the circularly polarized light 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) in the first polarization direction from the 1 / 4 wave plate back to the 1 / 4 wave plate, and the 1 / 4 wave plate converts the linearly polarized light (S light) in the first polarization direction from the reflective polarizer back to circularly polarized light or elliptically polarized light before emitting to the imaging unit 130. The imaging unit 130 reflects the received circularly polarized light or elliptically polarized light, and after passing through the 1 / 4 wave plate, it becomes linearly polarized light (P light) in the second polarization direction, and then passes through the reflective polarizer and emits to the human eye, forming a virtual image.

[0056] Here, the reflective polarizer is taken as an example of a polarizer that transmits P light and reflects S light. In other examples, the reflective polarizer may also be a polarizer that transmits S light and reflects P light.

[0057] Fourthly, the optical 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 located on the optical path of the image light emitted by the image generating unit 110, and sequentially located on the optical path of the image light emitted by the imaging unit 130. The transmission axis directions of the reflective polarizer and the absorptive polarizer are the same. Exemplarily, the absorptive polarizer, the reflective polarizer, and the quarter wave plate can be integrally manufactured and bonded to the surface of the inorganic glass 122, or the absorptive polarizer, the reflective polarizer, and the quarter wave plate can be sequentially bonded to the surface of the inorganic glass 122 through an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer provided by the polarizer.

[0058] The circularly polarized light or elliptically polarized light emitted by the image generating unit 110 is converted into linearly polarized light in the first polarization direction through a quarter wave plate, and the reflective polarizer reflects most of the linearly polarized light in the first polarization direction from the quarter wave plate to the quarter wave plate again, and the quarter wave plate converts the linearly polarized light in the first polarization direction from the reflective polarizer into circularly polarized light or elliptically polarized light again before emitting to the imaging unit 130. The absorptive polarizer is used 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 polarized light or elliptically polarized light, which 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 polarizer and the absorptive polarizer to emit to the human eye to form a virtual image. By setting an absorptive polarizer, it is possible to prevent the image light emitted by the image generating unit 110 from directly entering the human eye to form a real image, avoid interference with the virtual image, and improve the viewing effect of the user.

[0059] It should be noted that in the embodiments of the present application, the polarizer may also be referred to as a polarizer. The polarization directions of the reflective polarizer and the absorptive polarizer are the same, and both are the second polarization direction. In this way, the reflective polarizer is used to reflect linear polarized light in the first polarization direction and transmit linear polarized light in the second polarization direction, and the absorptive polarizer is used to absorb linear polarized light in the first polarization direction and transmit linear polarized light in the second polarization direction. Among them, the first polarization direction and the second polarization direction are perpendicular. Exemplarily, the linear polarized light in the first polarization direction is S light, and the linear polarized light in the second polarization direction is P light. Alternatively, the linear polarized light in the first polarization direction is P light, and the linear polarized light in the second polarization direction is S light.

[0060] Fifth, the optical path folding layer 121 includes a semi-transmissive and semi-reflective film, a first quarter-wave plate, and an absorption-type polarizer, which are sequentially located on the optical path of the image light emitted by the image generating unit 110, and sequentially located on the optical path of the image light emitted by the imaging unit 130. In this case, the optical path folding unit 120 further includes a second quarter-wave plate located on the optical path between the imaging unit 130 and the optical path folding layer 121.

[0061] For example, the absorption polarizer, the quarter wave plate and the semi-transparent and semi-reflective film can be integrally manufactured and then bonded to the surface of the inorganic glass 122, or the absorption polarizer and the quarter wave plate with the semi-transparent and semi-reflective film formed on the surface can be bonded to the surface of the inorganic glass 122 in sequence through an adhesive layer. Here, the adhesive layer can be an optical adhesive layer or a pressure-sensitive adhesive layer provided by the polarizer.

[0062] A portion of the circularly polarized light or elliptically polarized light (left-handed light) emitted by the image generation unit 110 is emitted to the first 1 / 4 wave plate through the semi-transparent and semi-reflective film, and after passing through the first 1 / 4 wave plate, it becomes linearly polarized light (S light) in the first polarization direction and then emitted to the absorption type polarizer. The absorption type polarized light absorbs the linearly polarized light (S light) in the first polarization direction. By providing an absorption type polarizer, it is possible to prevent the image light emitted by the image generation unit 110 from directly entering the human eye to form a real image, avoid interference with the virtual image, and improve the viewing effect of the user.

[0063] Another part of the circularly polarized light or elliptically polarized light (left-handed light) emitted by the image generating unit 110 is reflected by the semi-transparent and semi-reflective film to the second 1 / 4 wave plate, and becomes linearly polarized light (S light) in the second polarization direction after passing through the second 1 / 4 wave plate. The imaging unit 130 reflects the linearly polarized light (S light) in the second polarization direction to the second 1 / 4 wave plate again, and becomes circularly polarized light or elliptically polarized light (right-handed light) after passing through the second 1 / 4 wave plate, and then emits to the semi-transparent and semi-reflective film, and a part of it passes through the semi-transparent and semi-reflective film and then emits to the first 1 / 4 wave plate, and becomes linearly polarized light (P light) in the second polarization direction after passing through the first 1 / 4 wave plate. The linearly polarized light (P light) in the second polarization direction passes through the absorptive polarizer and is emitted to the human eye, forming a virtual image.

[0064] Sixth, the optical path folding layer 121 includes a semi-transparent semi-reflective film and an absorptive polarizer, which are sequentially located on the optical path of the image light emitted by the image generating unit 110 and sequentially located on the optical path of the image light emitted by the imaging unit 130. In this case, the optical path folding unit 120 further includes a 1 / 4 wave plate located on the optical path between the imaging unit 130 and the optical path folding layer 121. Exemplarily, the semi-transparent semi-reflective film and the absorptive polarizer can be integrally manufactured and bonded to the surface of the inorganic glass 122.

[0065] A portion of the linearly polarized light (S light) in the first polarization direction emitted by the image generating unit 110 passes through the semi-transparent and semi-reflective film and is absorbed by the absorptive polarizer. By providing the absorptive polarizer, it is possible to prevent the image light emitted by the image generating unit 110 from directly entering the human eye to form a real image, thereby avoiding interference with the virtual image and improving the viewing effect of the user.

[0066] Another part of the linear polarized light (S light) of the first polarization direction emitted by the image generating unit 110 is reflected by the semi-transparent and semi-reflective film to the 1 / 4 wave plate, and the 1 / 4 wave plate converts the received linear polarized light (S light) of the first polarization direction into circular polarized light or elliptically polarized light and then emits it to the imaging unit 130. The imaging unit 130 reflects the received circular polarized light or elliptically polarized light to the 1 / 4 wave plate again, and converts it into linear polarized light (P light) of the second polarization direction after passing through the 1 / 4 wave plate. A part of the linear polarized light (P light) of the second polarization direction sequentially passes through the semi-transparent and semi-reflective film and the absorption polarizer and is emitted to the human eye to form a virtual image.

[0067] Exemplarily, 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 the related art, the thickness of the inorganic glass is greater than 2 mm, and the thicker the thickness, the heavier the weight of the display device. By reducing the thickness of the inorganic glass, the weight of the display device can be reduced.

[0068] Optionally, the organic sheet 123 may be a single-layer structure or a multi-layer composite structure. Any layer of the organic sheet 123 may be made of the following materials: acrylic (i.e., polymethyl methacrylate (PMMA) (also known as organic glass)), 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.

[0069] Exemplarily, the thickness of the organic sheet 123 is 1 mm to 2 mm.

[0070] Since the in-vehicle display scene has higher requirements for the collision safety of the display device, the display device provided in the embodiment of the present application is particularly suitable for the in-vehicle display scene. By selecting the thickness of the inorganic glass 122 and the thickness and material of the organic plate 123, the relevant regulations of the collision safety test can be met.

[0071] In the embodiment of the present application, the light transmittance of the organic sheet 123 can be set according to actual needs. 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 sheet 123 is low, the intensity of the ambient light that passes through the organic sheet 123 and reaches the light path folding layer 121 is reduced, so that the intensity of the ambient light reflected by the light path folding layer 121 is also reduced. Therefore, the reflection of the ambient light by the light path folding unit can be reduced, and the user experience can be improved.

[0072] In some examples, the light transmittance of the organic sheet 123 can be increased by doping light absorbing particles in at least one layer of the organic sheet 123 and / or by performing a surface treatment (e.g., roughening) on ​​the organic sheet 123. The embodiment of the present application does not limit the type of light absorbing particles, as long as the light transmittance of the organic sheet 123 can be reduced.

[0073] Optionally, the organic sheet 123 may be colored, such as gray, blue, or brown, or the organic sheet 123 may be colorless.

[0074] Optionally, the organic plate 123 and the inorganic glass 122 may be bonded together by an optical adhesive layer.

[0075] The image generation unit 110 may be a direct imaging image source, such as an LCD, an organic light emitting diode, an OLED display screen or an LED display screen. Here, the LED display screen may be a micro LED display screen, or a mini LED display screen.

[0076] In other examples, the image generation unit 110 includes a projection imaging image source, which may be an optical machine (also known as a picture generation unit (PGU)). The optical machine includes a light source and a reflective spatial light modulator, the light source is used to generate a light beam, and the reflective spatial light modulator is used to modulate and reflect 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 machine, the image generation unit 110 also includes a diffusion screen (not shown). The diffusion screen is used to receive the light beam output by the optical machine and diffuse the received light beam (for example, diffusely reflect the received light beam), thereby improving the imaging quality.

[0077] The present application does not impose any limitation on the structure of the image generating unit 110 , as long as it can provide the aforementioned image light.

[0078] Optionally, when the light beam provided by the image generating 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 generating unit 110 is a three-dimensional image light, the virtual image seen by the user is a three-dimensional image.

[0079] In some examples, the image light emitted by the image generation unit 110 may be linearly polarized light, circularly polarized light, or elliptically polarized light.

[0080] When the polarization state of the image light emitted by the image source in the image generating unit 110 is different from the target polarization state required by the image generating unit 110, the image generating 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 a combination thereof (e.g., a 1 / 4 wave plate and a P polarizer, a 1 / 4 wave plate and an S polarizer). For example, by arranging a quarter wave plate on the surface of an LCD, the image light emitted by the LCD can be converted into circularly polarized light or elliptically polarized light.

[0081] In some examples, the imaging unit 130 includes a light-proof reflective imaging element, such as a curved reflector (e.g., a curved reflector made of metal), etc. In other examples, the imaging unit 130 includes a light-transmitting reflective imaging element, such as a lens, a lens group consisting of multiple lenses, or a light-transmitting curved mirror, etc. When the imaging unit 130 uses a light-proof reflective imaging element, the display device is a virtual reality (VR) display device, and when the imaging unit 130 uses a light-transmitting reflective imaging element, the display device is an augmented reality (AR) display device.

[0082] Optionally, the imaging unit 130 may further include a polarization state conversion element, such as a quarter wave plate, etc. 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.

[0083] exist Figure 4 In the illustrated embodiment, the light emitting surface of the image generating unit 110 is opposite to the light path folding unit 120. The image light emitted by the image generating unit 110 is reflected to the imaging unit 130 via the light path folding unit 120, and then the imaging unit 130 reflects the image light from the light path folding unit 120 to the light path folding unit 120, and finally emits from the light path folding unit 120. The number of reflections of the image light inside the display device is small, which is conducive to improving the light effect.

[0084] In other embodiments, the light emitting surface of the image generating unit 110 is opposite to the imaging unit 130. The image light emitted by the image generating 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, and then reflected by the imaging unit 130 again to the light path folding unit 120 before being emitted. In this example, the image distortion is small during the display process, and the picture quality of the virtual image is good.

[0085] It should be noted that Figure 4 In the figure, the image generating unit 110 is located above the imaging unit 130, and both the image generating 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 actual applications, the image generating unit 110 can also be arranged below the imaging unit 130.

[0086] Figure 5 Schematic diagram of the structure of an optical path folding unit provided in an embodiment of the present application. Figure 5 As shown, the optical path folding unit includes an outgoing optical path ( Figure 5 The optical path folding layer 121, inorganic glass 122, anti-reflection layer 124 and organic plate 123 are stacked in sequence (in the direction indicated by the arrow in the middle). The anti-reflection layer 124 is used to reduce the reflection of ambient light on the outer surface of the display device. The anti-reflection layer 123 may include at least two layers of polarization state conversion layers. By using at least two layers of 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 when it is not working, for example, black.

[0087] Exemplarily, the anti-reflection layer 124 includes a quarter wave plate 1241, a first linear polarizer 1242, and a second linear polarizer 1243 stacked in sequence along the outgoing light path of the imaging unit 130. The light transmission axis of the first linear polarizer 1242 and the light transmission axis of the second linear polarizer 1243 form an angle, which 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 the embodiment of the present application, 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 called a polarization state conversion layer.

[0088] The light component of the first polarization direction (the same direction as the transmission axis of the second linear polarizer 1243) in the ambient light passes through the second linear polarizer 1243, and then the light component of the second polarization direction (the same direction as the transmission axis of the first linear polarizer 1242) in the light component of the first polarization direction passes through the first linear polarizer 1242. Since there is an angle between the transmission axis of the first linear polarizer 1242 and the transmission axis of the second linear polarizer 1243, the intensity of the light component in the second polarization direction is lower than the intensity of the light component in the first polarization direction. After the light component of the second polarization direction passes through the 1 / 4 wave plate 1241, it becomes left-handed light (or right-handed light), and then passes through the inorganic glass 122 to reach the optical path folding layer 121. After being reflected by the optical path folding layer 121, it becomes right-handed light (or left-handed light). After passing through the 1 / 4 wave plate 1241, the right-handed light becomes linearly polarized light in the third polarization direction. The third polarization direction is perpendicular to the second polarization direction, and the linear polarized light in 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 intensity of the ambient light is first reduced by the second linear polarizer 1243, and the ambient light entering the interior of the display device is further reduced. In conjunction with the circular polarizer, the ambient light reflected back from the display device can be further reduced or even completely eliminated.

[0089] Alternatively, in other embodiments, the anti-reflection layer 124 may not include the second linear polarizer 1243 , and may only include the quarter wave plate 1241 and the first linear polarizer 1242 .

[0090] Due to the material properties of the organic sheet 123, the phase of the light will change after passing through the organic sheet 123. If the organic sheet 123 is arranged between any two polarization state conversion layers in the anti-reflection layer 124, for example, between the 1 / 4 wave plate 1241 and the first linear polarizer 1242, or the organic sheet 123 is arranged 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 arranged between the organic sheet 123 and the inorganic glass 122, which can ensure the effect of the anti-reflection layer 124 in reducing the reflectivity. In addition, the organic sheet 123 is located on the side of the anti-reflection layer 124 away from the inorganic glass 122, which can also protect the anti-reflection layer 124.

[0091] Optionally, an optical adhesive layer is provided between the inorganic glass 122 and the organic plate 123 .

[0092] Exemplarily, the 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 in sequence. The first TAC layer and the second TAC layer play a supporting and protective role and can prevent the linear polarizer from shrinking; the PVA layer is used to achieve polarization. The PSA layer is used to attach the linear polarizer to other structures.

[0093] Since one surface of the polarizer (i.e., the surface where the PSA layer is located) is sticky, it can be directly attached to the adjacent layer structure. For the non-sticky surface of the polarizer, it can be bonded to the adjacent layer structure through optical adhesive.

[0094] For example, Figure 5 In the illustrated embodiment, one surface of the second linear polarizer 1243 is bonded to the organic plate 123 via an optical adhesive layer 126. In other embodiments, one surface of the circular polarizer may be bonded to the inorganic glass 122 via an optical adhesive layer.

[0095] Exemplarily, 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%.

[0096] When the transmittance of the optical adhesive layer is low, the intensity of the ambient light reaching the optical path folding layer 121 is reduced, so that the intensity of the ambient light reflected by the optical path folding layer 121 is also reduced. Therefore, the reflection of the ambient light by the optical path folding unit can be reduced, and the user experience is improved. The transmittance of the optical adhesive layer can be controlled by doping light-absorbing particles in the optical adhesive. The embodiment of the present application does not limit the type and doping amount of the light-absorbing particles.

[0097] The optical path folding unit further includes an optical film 125, which is located on the side of the organic plate 123 away from the inorganic glass 122, and includes at least one of the following: an AR film and an anti-glare film. The optical film 125 can further reduce the reflection of ambient light by the optical folding unit and improve the user experience.

[0098] Optionally, the display device further includes a housing (not shown). The housing has an observation window, which is opposite to the user's eyes for the user to view the virtual image. The image generation unit 110 and the imaging unit 130 are both located in the housing, the light path folding unit 120 is located at the observation window, and the organic sheet 123 is closer to the outside of the housing relative to the inorganic glass 122. In this way, the housing can protect each unit, and the various units are integrated together through the housing to facilitate the overall movement of the display device.

[0099] The embodiment of the present disclosure does not limit the shape of the housing, which may be a rectangular parallelepiped or a cylinder, etc. In addition, when the display device is integrated into a large product, such as a seat of a vehicle, the seat may be used to provide a receiving cavity, the image generating unit 110 and the imaging unit 130 may be directly disposed in the receiving cavity, and the optical path folding unit 120 may be arranged at the opening of the receiving cavity, so that the housing may be omitted.

[0100] Optionally, the display device may further include a main processor. The main processor is used to send image data to the image generation unit.

[0101] Optionally, the display device further comprises a power supply for supplying power to the main processor and the image generating unit.

[0102] Figure 6 is a circuit diagram of a display device provided in an embodiment of the present application. Figure 6 As shown, the circuit in the display device mainly includes a 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. Among them, 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 can be connected through a bus. The host processor 1101 can be called a front-end processor.

[0103] In addition, the circuit diagrams shown in the embodiments of the present application do not constitute a specific limitation on the display device. In other embodiments of the present application, the display device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0104] The main processor 1101 includes one or more processing units, for example, the main processor 1101 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0105] The main processor 1101 may also be provided with a memory for storing computer instructions and data. In some embodiments, the memory in the main processor 1101 is a cache memory. The memory may store instructions or data that the main processor 1101 has just used or circulated. If the main processor 1101 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the main processor 1101, and thus improves the efficiency of the system.

[0106] In some embodiments, the display device may further include a plurality of input / output (I / O) interfaces 1108 connected to the main processor 1101. The I / O interface 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 above-mentioned I / O interface 1108 may be connected to devices such as a mouse, a touchpad, a keyboard, a camera, a speaker / speaker, a microphone, etc., or may be a physical button on the display device (such as a volume button, a brightness adjustment button, a power button, etc.).

[0107] 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 implement a data storage function.

[0108] The internal memory 1103 can be used to store computer executable program codes, which include instructions. The internal memory 1103 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting function, etc.), etc. The data storage area may store data created during the use of the display device (such as a phone book, world time, etc.), etc. In addition, the internal memory 1103 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc. The main processor 1101 executes various functional applications and data processing of the display device by running instructions stored in the internal memory 1103 and / or instructions stored in a memory provided in the main processor 1101.

[0109] The display device can implement audio functions such as music playing and calls through the audio module 1104 and the application processor.

[0110] The audio module 1104 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal. The audio module 1104 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 1104 can be arranged in the main processor 1101, or some functional modules of the audio module 1104 can be arranged in the main processor 1101.

[0111] The video interface 1109 can receive external audio and video signals, which can be specifically a high definition multimedia interface (HDMI), a digital visual interface (DVI), a video graphics array (VGA), a display port (DP), etc. The video interface 1109 can also output video to the outside. When the display device is used as a head-up display, the video interface 1109 can receive speed signals and power signals input from peripheral devices, and can also receive external AR video signals. When the display device is used as a desktop display device, the video interface 1109 can receive video signals input from an external computer or terminal device.

[0112] The video module 1105 can decode the video input by the video interface 1109, for example, by performing H.264 decoding. The video module can also encode the video collected by the display device, for example, by performing H.264 encoding on the video collected by the external camera. In addition, the main processor 1101 can also decode the video input by the video interface 1109, and then output the decoded image signal to the display circuit 1110.

[0113] The display circuit 1110 is used to drive the image generation unit 110 to display the corresponding image. In this embodiment, the video interface 1109 receives an external input video source signal, and the video module 1105 decodes and / or digitally processes and outputs one or more image signals to the display circuit 1110. The display circuit 1110 drives the image generation unit 110 to perform imaging according to the input image signal, and then outputs imaging light. In addition, the main processor 1101 can also output an image signal to the display circuit 1110. In addition, the display circuit 1110 can also drive the image generation unit 110 to display an interactive image according to the input image signal.

[0114] The processor 1101 may control the image generation unit 110 to display an image by executing computer instructions.

[0115] The power module 1106 is used to provide power to the main processor 1101 and the image generation unit 110 based on input power (such as direct current). The power module 1106 may include a rechargeable battery, which can provide power to the main processor 1101 and the image generation unit 110.

[0116] The wireless communication module 1107 can enable the display device to communicate wirelessly with the outside world, and can provide wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) and other wireless communication solutions. 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, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the main processor 1101. The wireless communication module 1107 can also receive the signal to be sent from the main processor 1101, modulate the frequency of the signal, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0117] In addition, in addition to being input through the video interface 1109, the video data decoded by the video module 1105 can also be wirelessly received through the wireless communication module 1107 or read from an external memory. For example, the display device can receive video data from a terminal device or an in-vehicle entertainment system through the wireless local area network in the vehicle, and the display device can also read audio and video data stored in an external memory.

[0118] An embodiment of the present application also provides a vehicle, which includes any of the aforementioned display devices.

[0119] See also Figure 7 , Figure 7 A functional schematic diagram of a vehicle provided in an embodiment of the present application.

[0120] The vehicle may include various subsystems, such as the sensor system 21, the control system 22, one or more peripheral devices 23 (one is shown as an example), the power supply 24, the computer system 25 and the display system 26 shown in the figure, and the above subsystems can communicate with each other. The display system 22 may include the display device provided in the embodiment of the present application. The vehicle may also include other functional systems, such as an engine system that provides power for the vehicle, a cockpit, etc., which are not limited in the present application.

[0121] The sensor system 21 may include a number of detection devices, which can sense the information being measured and convert the sensed information into electrical signals or other required forms of information output according to certain rules. 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 elements used for automatic detection, etc., but this application is not limited to this.

[0122] The control system 22 may include several components, such as the steering unit, brake unit, lighting system, automatic driving system, map navigation system, network timing system and obstacle avoidance system shown in the figure. The control system 22 may receive information (such as vehicle speed, vehicle distance, etc.) sent by the sensor system 21 to realize functions such as automatic driving and map navigation.

[0123] 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 the present application.

[0124] The 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 realize network communication between the vehicle and other devices other than the vehicle. In practical applications, the communication system may use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or optical fiber.

[0125] The power source 24 represents a system that provides power or energy for the vehicle, which may include but is not limited to a rechargeable lithium battery or a lead-acid battery, etc. In practical applications, one or more battery components in the power source are used to provide power or energy for starting the vehicle, and the type and material of the power source are not limited in this application.

[0126] 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 (one processor is shown as an example in the figure) and a memory 2502 (also referred to as a storage device). In actual applications, the memory 2502 is also inside the computer system 25, or it can be outside the computer system 25, for example, as a cache in the vehicle, etc., which is not limited in this application.

[0127] The processor 2501 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2501 may be used to run the relevant programs or instructions corresponding to the programs stored in the memory 2502 to implement the corresponding functions of the vehicle.

[0128] The memory 2502 may include a volatile memory, such as a RAM; the memory may also include a non-volatile memory, such as a ROM, a flash memory, a HDD, or a solid-state drive SSD; the memory 2502 may also include a combination of the above-mentioned types of memory. The memory 2502 may be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2501 can call the program codes or instructions stored in the memory 2502 to implement the corresponding functions of the vehicle. In the present application, a set of program codes for vehicle control may be stored in the memory 2502, and the processor 2501 may call the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in this application.

[0129] Optionally, in addition to storing program codes or instructions, the memory 2502 may also store information such as road maps, driving routes, sensor data, etc. The computer system 25 may be combined with other elements in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc., to implement relevant functions of the vehicle. For example, the computer system 25 may control the driving direction or driving speed of the vehicle based on the data input from the sensor system 21, which is not limited in this application.

[0130] The display system 26 can interact with other systems in 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 the peripheral device 23. The specific structure of the display system 26 refers to the embodiment of the above-mentioned display device, which will not be repeated here.

[0131] Among them, the four subsystems illustrated in the present embodiment, the sensor system 21, the control system 22, the computer system 25 and the display system 26 are only examples and do not constitute a limitation. In practical applications, a vehicle can combine several components in the vehicle according to different functions to obtain subsystems with corresponding different functions. In practical applications, a vehicle may include more or fewer subsystems or components, which is not limited in this application.

[0132] The means of transportation in the embodiments of the present application may be known means of transportation such as cars, airplanes, ships, rockets, etc., or may be new means of transportation that will appear in the future. The car may be an electric car, a fuel car, or a hybrid car, for example, a pure electric car, an extended-range electric car, a hybrid electric car, a fuel cell car, a new energy car, etc., and the present application does not make specific limitations on this.

[0133] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0134] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the present application shall be included in the protection scope of the present application.

Claims

1. A display device, characterized in that: The display device comprises: an image generating unit, an optical path folding unit and an imaging unit; The image generating unit is used to emit image light; The optical path folding unit is used to guide the image light from the image generating unit to the imaging unit; The imaging unit is used to form a virtual image based on the image light from the light path folding unit; The optical path folding unit comprises an optical path folding layer, an inorganic glass, an anti-reflection layer and an organic plate which are sequentially stacked along the outgoing optical path of the imaging unit; The anti-reflection layer includes a quarter wave plate, a first linear polarizer and a second linear polarizer stacked in sequence along the outgoing light path of the imaging unit, and an angle is formed between the transmission axis of the first linear polarizer and the transmission axis of the second linear polarizer, and the angle is greater than 0 degree and less than 90 degrees.

2. 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 comprises a quarter wave plate and a reflective polarizer stacked in sequence along the outgoing optical path of the imaging unit; Alternatively, the optical path folding layer includes a quarter wave plate, a reflective polarizer and an absorptive polarizer stacked in sequence along the outgoing optical path of the imaging unit, and the transmission axes of the reflective polarizer and the absorptive polarizer are in the same direction.

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

4. The display device according to claim 1, characterized in that The organic sheet material comprises at least one of the following: an acrylic sheet, a polycarbonate sheet, a polyvinyl chloride sheet, polystyrene and propylene glycol carbonate.

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

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

7. The display device according to claim 6, characterized in that: The optical adhesive layer has a light transmittance of 50% to 100%.

8. 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.

9. The display device according to claim 1, characterized in that: The light path folding unit further includes an optical film, which is located on a side of the organic plate away from the inorganic glass, and the optical film includes at least one of the following: an anti-reflection film and an anti-glare film.

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

11. The display device according to any one of claims 1 to 10, characterized in that: The imaging unit includes a curved reflector.

12. A means of transport, characterized in that: The display device comprises the display device according to any one of claims 1 to 11, wherein the display device is installed on the vehicle.

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