Display device

Abstract

A display device (100), comprising a display assembly, a retroreflective assembly (30), a second reflective polarizer (40), and a transparent reflective element (50). The display assembly comprises a display screen (10) and a first reflective polarizer (20). The display screen (10) comprises a light exit surface (11). The first reflective polarizer (20) is located on one side of the light exit surface (11) of the display screen (10). The retroreflective assembly (30) is located on one side of the first reflective polarizer (20), and the second reflective polarizer (40) is located on one side of the retroreflective assembly (30) and one side of the first reflective polarizer (20). The extension directions of the retroreflective assembly (30), the display screen (10) and the second reflective polarizer (40) intersect in pairs. The transparent reflective element (50) is located on the side of the second reflective polarizer (40) distant from the display screen (10) and the retroreflective assembly (30) and inclines by a certain angle relative to the second reflective polarizer (40). The polarization direction of light emitted by the display screen (10) is the same as the polarization direction of the first reflective polarizer (20), and is perpendicular to the polarization direction of the second reflective polarizer (40), and the polarization direction of the light retroreflected by the retroreflective assembly (30) is the same as the polarization direction of the second reflective polarizer (40).

Description

Display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311647111.7, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicle-mounted display technology, and in particular to a display device. Background Art

[0003] In-vehicle display technology continues to evolve with advancements in display technology. Currently, a wide variety of in-vehicle display configurations exist, including dual-screen, triple-screen, custom-shaped, and flexible screens. As living standards improve, consumers' demand for safe driving continues to grow. Head-up display (HUD) technology can display information such as driving speed and route navigation in front of the vehicle, ensuring drivers don't need to look down at the instrument panel while driving, thus ensuring driving safety.

[0004] Currently, there are three main in-vehicle display solutions: conventional in-car display screens, augmented reality (AR) head-up displays, and in-car head-up displays. AR head-up displays typically utilize a combination of hyperbolic mirrors, resulting in a complex optical module and high cost. In-car head-up displays also have low light efficiency. SUMMARY OF THE INVENTION

[0005] In view of this, the present application provides a display device with a simple structure and capable of improving light efficiency utilization.

[0006] To solve the above problems, the technical solutions provided by this application are as follows:

[0007] In a first aspect, the present application provides a display device, comprising: a display assembly, comprising a display screen and a first reflective polarizer, the display screen comprising a light emitting surface, the first reflective polarizer being located on one side of the light emitting surface of the display screen; a retroreflective assembly, located on one side of the first reflective polarizer; a second reflective polarizer, located on one side of the retroreflective assembly and the first reflective polarizer; extension directions of the retroreflective assembly, the display screen and the second reflective polarizer intersect in pairs; and a transparent reflective element, located on a side of the second reflective polarizer away from the display screen and the retroreflective assembly and tilted at a certain angle relative to the second reflective polarizer; wherein the polarization direction of light emitted from the display screen is the same as the polarization direction of the first reflective polarizer and is perpendicular to the polarization direction of the second reflective polarizer, and the polarization direction of light retroreflected by the retroreflective assembly is the same as the polarization direction of the second reflective polarizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a schematic diagram of a display device provided in some embodiments of the present application.

[0009] FIG2 is a schematic diagram of another display device provided in some other embodiments of the present application.

[0010] FIG. 3 is a schematic diagram of a light-blocking structure in the display device shown in FIG. 2 .

[0011] FIG. 4 is a schematic diagram of another light-blocking structure in the display device shown in FIG. 2 .

[0012] FIG5 is a schematic diagram of another light-blocking structure in a display device. Modes for Carrying Out the Invention

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0014] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0015] The present application may repeat reference numerals and / or reference letters in different embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0016] The display device provided in this application will be described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Referring to FIG1 , a first embodiment of the present application provides a display device 100, which includes a display assembly, a retroreflective assembly 30, a second reflective polarizer 40, and a transparent reflective element 50. The display assembly includes a display screen 10 and a first reflective polarizer 20. The display screen 10 includes a light emitting surface 11. The first reflective polarizer 20 is located on one side of the light emitting surface 11 of the display screen 10. The retroreflective assembly 30 is located on one side of the first reflective polarizer 20. The second reflective polarizer 40 is located on one side of the retroreflective assembly 30 and the first reflective polarizer 20. Extension directions of the retroreflective assembly 30, the display screen 10, and the second reflective polarizer 40 intersect with each other. The transparent reflective element 50 is located on a side of the second reflective polarizer 40 away from the display screen 10 and the retroreflective assembly 30 and is inclined at a certain angle relative to the second reflective polarizer 40. The polarization direction of the light emitted by the display screen 10 is the same as that of the first reflective polarizer 20 and is perpendicular to the polarization direction of the second reflective polarizer 40 . The polarization direction of the light retroreflected by the retroreflective component 30 is the same as that of the second reflective polarizer 40 .

[0018] In some embodiments, the light emitted by the display screen 10 is linearly polarized light (also known as parallel polarized light, P light) or circularly polarized light (a type of elliptically polarized light, also known as vertically polarized light, S light).

[0019] Among them, the first reflective polarizer 20 and the second reflective polarizer 40 can use any suitable type of reflective polarizer, such as a reflective polarizing and brightening film (DBEF), a multilayer optical film (MOF) reflective polarizer, a diffuse reflection polarizing film (DRPF), a wire grid reflective polarizer and a cholesteric reflective polarizer.

[0020] In some embodiments, the first reflective polarizer 20 and the second reflective polarizer 40 are reflective brightening film (DBEF), such as DBEF from 3M, USA, which is manufactured using a multilayer film technology with different refractive indices. Diffuser layers or diffusers may also be provided on both sides of the DBEF.

[0021] In some embodiments, the reflective polarizer 20 and the second reflective polarizer 40 may also be a structure formed by stacking a polarizer and a reflective film.

[0022] In some embodiments, the retroreflective component 30 includes a quarter wave plate 31 and a retroreflective film 32 formed on the quarter wave plate 31. The retroreflective film 32 is located on a surface of the quarter wave plate away from the second reflective polarizer 40 and the first reflective polarizer 20.

[0023] The quarter wave plate 31 is used to convert linearly polarized light incident thereon into circularly polarized light or vice versa, and the retroreflective film 32 is used to return incident light incident thereon in a direction opposite to the incident light.

[0024] In some embodiments, the display device 100 further includes a transparent substrate 41, the second reflective polarizer 40 is located on the transparent substrate 41, and the light emitting surface of the second reflective polarizer 40 contacts the transparent substrate 41. In some embodiments, the transparent substrate 41 is transparent glass.

[0025] In some embodiments, the angle between the first reflective polarizer 20 and the second reflective polarizer 40 is in the range of 30° to 80°. The first reflective polarizer 20 and the second reflective polarizer 40 within this angle range have good light efficiency.

[0026] In this embodiment, the angle between the first reflective polarizer 20 and the second reflective polarizer 40 is 45°. When the angle between the first reflective polarizer 20 and the second reflective polarizer 40 is 45°, the light efficiency of the display device 100 is the highest.

[0027] In some embodiments, the display device 100 is a vehicle-mounted display device, and the transparent reflective element 50 is a vehicle-mounted transparent glass.

[0028] In some embodiments, the display device 100 further includes a housing (not shown), and the display screen 10 , the first reflective polarizer 20 , the retroreflective component 30 , the second reflective polarizer 40 and the transparent reflective element 50 are all located in the housing.

[0029] The angle between the transparent reflective element 50 and the second reflective polarizer 40 is an acute angle or an obtuse angle. In this embodiment, the angle between the transparent reflective element 50 and the second reflective polarizer 40 is an acute angle, and the orthographic projection of the transparent reflective element 50 on the transparent substrate 41 covers at least a portion of the second reflective polarizer 40. Of course, when the display device 100 is an in-vehicle display device, the transparent reflective element 50 is the in-vehicle glass. The position of the transparent reflective element 50 remains unchanged, and the angle between the transparent reflective element 50 and the second reflective polarizer 40 can be changed by adjusting the position of the transparent reflective element 50. This ensures that the virtual image formed by the head-up display outside the vehicle and the real image formed by the head-up display inside the vehicle do not interfere with each other, making it easier for the driver to view the information displayed on the display screen 10.

[0030] In some embodiments, light emitted from the first reflective polarizer 20 and incident on the surface of the second reflective polarizer 40 passes through the second reflective polarizer 40 after passing through the retroreflective component 30 and forms a real image on the light-emitting side of the second reflective polarizer 40, and the real image is mirror-symmetrical to the image displayed on the display screen 10; light emitted from the first reflective polarizer 20 and incident on the retroreflective component 30 is retroreflected to the surface of the first reflective polarizer 20 and reflected on the surface of the first reflective polarizer 20 to form a reflected light beam, and the reflected light beam passes through the second reflective polarizer 40 and is emitted on the transparent reflective element 50 and forms a virtual image on the side of the transparent reflective element 50 away from the second reflective polarizer 40, and the virtual image is mirror-symmetrical to the image displayed on the light-emitting surface of the second reflective polarizer 40.

[0031] Because the polarization direction of the light emitted from the display screen 10 is the same as that of the first reflective polarizer 20, the light emitted from the display screen 10 passes through the first reflective polarizer 20. Since the polarization direction of the light emitted from the display screen 10 is perpendicular to that of the second reflective polarizer 40, the light L1 emitted from the first reflective polarizer 20 and directly incident on the surface of the second reflective polarizer 40 cannot pass through the second reflective polarizer 40. The light reflected from the second reflective polarizer 40 to the retroreflective assembly 30 has its polarization direction changed after passing through the quarter-wave plate 31 and the retroreflective film 32. The polarization direction of the resulting retroreflected light is the same as that of the second reflective polarizer 40 and can pass through the second reflective polarizer 40. The light directly incident from the first reflective polarizer 20 to the retroreflective component 30 has its polarization direction changed after passing through the 1 / 4 wave plate 31 and the retroreflective film 32. The polarization direction of the formed retroreflected light is perpendicular to the polarization direction of the first reflective polarizer 20 and is the same as the polarization direction of the second reflective polarizer 40. Therefore, the retroreflected light beam formed after the light directly incident from the first reflective polarizer 20 to the retroreflective component 30 will be reflected on the surface of the first reflective polarizer 20, and the reflected light beam thus formed can pass through the second reflective polarizer 40.

[0032] Specifically, light L1 emitted from the first reflective polarizer 20 and directly incident on the surface of the second reflective polarizer 40 is reflected by the surface of the second reflective polarizer 40, forming a first reflected light ray L2. The first reflected light ray L2 is then reflected into the retroreflective assembly 30 and forms a first retroreflected light ray L3. Because the polarization direction of the first retroreflected light ray L3 is the same as that of the second reflective polarizer 40, the first retroreflected light ray L3 passes through the second reflective polarizer 40 and forms a first outgoing light ray L4. The first outgoing light ray L4 forms a first image 60 on the light-exiting side of the second reflective polarizer 40. The first image 60 is a real image. The display screen 10, the first reflective polarizer 20, the retroreflective assembly 30, and the second reflective polarizer 40 implement an in-vehicle head-up display.

[0033] Light L5 emitted from the first reflective polarizer 20 and directly incident on the retroreflective assembly 30 is retroreflected within the retroreflective assembly 30 and forms a second retroreflected ray L6. The second retroreflected ray L6 is emitted from the surface of the first reflective polarizer 20 and forms a second reflected ray L7. The polarization direction of the second reflected ray L7 is the same as the polarization direction of the second reflective polarizer 40. The second reflected ray L7 passes through the second reflective polarizer 40 and forms a second outgoing ray L8. The second outgoing ray L8 is incident on the transparent reflective element 50 and forms a third reflected ray L9. The third reflected ray L9 forms a second image 70 on the side of the transparent reflective element 50 away from the second reflective polarizer 40. The second image 70 is a virtual image. The display screen 10, the first reflective polarizer 20, the retroreflective assembly 30, and the second reflective polarizer 40 implement an exterior head-up display.

[0034] In some embodiments, when the light emitted by the display screen 10 is P light, the first reflective polarizer 20 transmits the P light and reflects the S light, and the second reflective polarizer 40 transmits the S light and reflects the P light.

[0035] In this embodiment, the light path of in-vehicle imaging (in-vehicle head-up display) is: the P light emitted by the display screen 10 is reflected by the second reflective polarizer 40 and then passes through the 1 / 4 wave plate 31 to form left-handed circularly polarized light, and then passes through the retroreflective film 32 and the 1 / 4 wave plate 31 to form S-polarized light. The S-polarized light passes through the second reflective polarizer 40 to form a real image in the vehicle.

[0036] In this embodiment, the light path of the outside-vehicle imaging (outside-vehicle head-up display) is: the P light emitted by the display screen 10 passes through the 1 / 4 wave plate 31 above the retroreflective film 32 to form left-handed circularly polarized light, and then passes through the retroreflective film 32 and the 1 / 4 wave plate 31 to form S-polarized light. After being reflected from the surface of the display screen 10, the S-polarized light passes through the second reflective polarizer 40 and then reflects through the transparent reflective element 50 (for example: the vehicle windshield), forming a virtual image outside the vehicle.

[0037] In some embodiments, when the light emitted by the display screen 10 is S light, the first reflective polarizer 20 transmits the S light and reflects the P light, and the second reflective polarizer 40 transmits the P light and reflects the S light.

[0038] In this embodiment, the light path of in-vehicle imaging (in-vehicle head-up display) is: the S light emitted by the display screen 10 is reflected by the second reflective polarizer 40 and then passes through the 1 / 4 wave plate 31 to form right-handed circularly polarized light, and then passes through the retroreflective film 32 and the 1 / 4 wave plate 31 to form P polarized light. The P polarized light passes through the second reflective polarizer 40 to form a real image in the vehicle.

[0039] In this embodiment, the light path of the outside-vehicle imaging (outside-vehicle head-up display) is: the S light emitted by the display screen 10 passes through the 1 / 4 wave plate 31 above the retroreflective film 32 to form right-handed circularly polarized light, and then passes through the retroreflective film 32 and the 1 / 4 wave plate 31 to form P-polarized light. After being reflected from the surface of the display screen 10, the P-polarized light passes through the second reflective polarizer 40 and then reflects through the transparent reflective element 50 (for example: the vehicle windshield), forming a virtual image (second image) outside the vehicle.

[0040] Generally, in order to prevent the influence of glare, the polarized glasses worn by the driver transmit P light.

[0041] To sum up, the real image and virtual image formed by the display device 100 provided in the present application are in different positions (non-overlapping), which can avoid overlapping interference between the real image and the virtual image, and can simultaneously support the in-vehicle head-up display (forming a real image) and the out-of-vehicle AR head-up display (forming a virtual image). The in-vehicle head-up display does not need to pass through a transparent reflective element (for example, a windshield) to form a real image, and the out-of-vehicle AR head-up display can also use the part of the light that is not directly irradiated on the second reflective polarizer, thereby improving the utilization rate of the light emitted by the display screen of the display device.

[0042] In some embodiments, the first reflective polarizer 20 replaces the conventional polarizer on the existing display screen surface. This replaces the conventional polarizer on the existing display screen surface with a reflective polarizer. While meeting the original polarization requirements, this application further utilizes the light reflected by the retroreflective component 30 onto the first reflective polarizer 20, thereby improving light utilization. In some embodiments, the display device 100 has a light efficiency utilization rate greater than or equal to 40%, increasing the light utilization rate of the display device 100 from 20% to 40%. This application, by simply adding the first reflective polarizer 20, can simultaneously implement both in-vehicle and out-of-vehicle AR heads-up displays, resulting in a simple structure and favorable for mass production.

[0043] Referring to Figures 2 to 5 , the present application further provides another display device 200. The structure of the display device 200 is substantially the same as that of the display device 100, with the only difference being that the display device 200 further includes a light-blocking structure 80 located on the light-exiting side of the second reflective polarizer 40. The light-blocking structure 80 has a first state and a second state. In the first state, the light-blocking structure 80 has a light-blocking function and is tilted relative to the second reflective polarizer 40, with the orthographic projection of the light-blocking structure 80 on the plane where the second reflective polarizer 40 is located at least partially falling on the second reflective polarizer 40. In the second state, the light-blocking structure 80 has no light-blocking function and is located outside the light-exiting surface of the second reflective polarizer 40.

[0044] Generally, the light efficiency of the in-car head-up display can reach 40%, while the light efficiency of the outdoor AR head-up display is reduced by about 10% due to the reflection efficiency of the windshield. Therefore, the brightness of the outdoor AR head-up display is relatively low. Without considering the increase in the power consumption of the display screen 10, the in-car head-up display (real image) is suitable for use when the ambient light is relatively bright (for example, during the day), while the outdoor AR head-up display (virtual image) is suitable for use when the ambient light is relatively dark (for example, at night). Therefore, the display device 200, with the help of the light-blocking structure 80, can choose whether to use the in-car head-up display or the outdoor AR head-up display according to the brightness of the ambient light, and then by adjusting the position and state of the light-blocking structure 80, it is conducive to switching between the virtual image (outside head-up display) and the real image (in-car head-up display). Specifically, when the in-car head-up display is used, the light-blocking structure 80 is used to block the light emitted from the second reflective polarizer 40 and incident on the transparent reflective element 50; when the outdoor AR head-up display is used, the light-blocking structure 80 is used to block the light emitted from the second reflective polarizer 40 and used to form the real image.

[0045] Referring to FIG3 , in some embodiments, the light-blocking structure 80 includes a light-blocking plate 81 and a reel 82. The light-blocking plate 81 is flexible, and one end of the light-blocking plate 81 is connected to the reel 82. The reel 82 can be fixed or detachably fixed to the housing. Under the action of an external force, the light-blocking plate 81 can be wound around or unfolded on the reel 82. The light-blocking structure 80 uses the light-blocking plate 81 in combination with the reel 82, which can not only realize the switching between the virtual image (head-up display outside the vehicle) and the real image (head-up display inside the vehicle), but also reduce the floor space occupied by the light-blocking structure 80.

[0046] Referring to FIG. 4 , in some embodiments, the light-blocking structure 80 includes a light-blocking plate 81 and a push-pull member 83. One end of the light-blocking plate 81 is fixed or detachably fixed to the housing, and the push-pull member 83 is fixed to one end of the light-blocking plate 81. The light-blocking plate 81 is elastic, and under the action of an external force acting on the push-pull member 83, the push-pull member 83 can cause the light-blocking plate 81 to expand or not expand. Of course, such a design also requires a fixing member having one end of the push-pull member 83 to fix the light-blocking plate 81, so that the light-blocking plate 81 remains in the expanded state. When the end of the light-blocking plate 81 having the push-pull member 83 is released from the fixing, the light-blocking plate 81 returns to its original state under the action of its own elastic force. Among them, the light-blocking structure 80 adopts the elastic light-blocking plate 81 in combination with the push-pull member 83, which can not only realize the switching between the virtual image (head-up display outside the vehicle) and the real image (head-up display inside the vehicle), reduce the floor space occupied by the light-blocking structure 80, but also provide power for the expansion or retraction of the light-blocking structure 80.

[0047] Referring to FIG. 5 , in some embodiments, the light-blocking structure 80 includes a light-blocking plate 81 and a rotating shaft 84. The rotating shaft 84 is fixed or detachably fixed to the housing, and one end of the light-blocking plate 81 is sleeved on the rotating shaft 84. Under the action of an external force, the light-blocking plate 81 can rotate on the rotating shaft 84. The light-blocking structure 80 provided in this embodiment utilizes the light-blocking plate 81 in conjunction with the rotating shaft 84. When the light-blocking plate 81 is needed for light blocking, the light-blocking plate 81 is rotated to a designated position. When the light-blocking plate 81 is no longer needed for light blocking, the light-blocking plate 81 is rotated back to its original position. This structure is simple to operate and occupies a small area.

[0048] In some embodiments, the light shield 81 is made of a black light-absorbing material and an electrochromic material. The electrochromic material is black (opaque) when powered on and transparent (transmissive) when not powered on.

[0049] In some embodiments, the light blocking structure 80 is a polarizer whose polarization direction is perpendicular to that of the second reflective polarizer; further, the light blocking plate 81 is a polarizer whose polarization direction is perpendicular to that of the second reflective polarizer.

[0050] Continuing with FIG. 2 , in some embodiments, the light-blocking structure 80 includes a first light-blocking plate 801 and a second light-blocking plate 802. The first light-blocking plate 801 and the second light-blocking plate 802 are located on the light-emitting side of the second reflective polarizer 40 and are respectively inclined relative to the second reflective polarizer 40. The extension directions of the first light-blocking plate 801, the second light-blocking plate 802, and the second reflective polarizer 40 intersect with each other. Specifically, the first light-blocking plate 801 and the retroreflective component 30 are located at the same end of the second reflective polarizer 40, and the second light-blocking plate 802 and the display screen 10 are located at the same end of the second reflective polarizer 40. Specifically, the structures of the first light-blocking plate 801 and the second light-blocking plate 802 can both apply the structure of the light-blocking plate 81 described above.

[0051] In some embodiments, the light-blocking structure 80 may include only one light-blocking plate 81, and the position of the light-blocking plate 81 may be variable. Specifically, when only an in-vehicle head-up display is required, the light-blocking plate 81 is located at the end of the second reflective polarizer 40 near the transparent reflective element 50, thereby blocking light projected from the second reflective polarizer 40 onto the transparent reflective element 50, thereby preventing a virtual image from forming on the side of the transparent reflective element 50 away from the second reflective polarizer 40. When only an out-of-vehicle head-up display is required, the light-blocking plate 81 is located at the end of the second reflective polarizer 40 away from the transparent reflective element 50, thereby blocking light emitted from the second reflective polarizer 40 for forming a real image, thereby preventing a real image from forming on the light-emitting side of the second reflective polarizer 40.

[0052] In some embodiments, the display device 200 further includes an ambient light brightness detection element 90, which is connected to the display screen 10; the ambient light brightness detection element 90 is configured to detect the brightness of the ambient light and determine, based on the brightness of the ambient light, whether one of the first light baffle 801 and the second light baffle 802 should be selected to be in the first state, and the judgment result is displayed on the display screen; wherein, the ambient light brightness detection element 90 is configured to detect the brightness of the ambient light and automatically adjust the opening and closing of the first light baffle 801 and the second light baffle 802 based on the brightness of the ambient light, so as to realize the intelligent selection of the in-vehicle head-up display and the out-vehicle AR head-up display. Specifically, a brightness threshold can be set. When the brightness of the external ambient light is lower than the brightness threshold, the out-vehicle AR head-up display is used. When the brightness of the external ambient light is higher than or equal to the brightness threshold, the in-vehicle head-up display is used.

[0053] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims.

Claims

1. A display device, comprising: The display assembly comprises a display screen and a first reflective polarizer, wherein the display screen comprises a light emitting surface, and the first reflective polarizer is located on one side of the light emitting surface of the display screen; A retroreflective component, located on one side of the first reflective polarizer; A second reflective polarizer is located on one side of the retroreflective component and the first reflective polarizer; the retroreflective component, the display screen and the second reflective polarizer extend in directions that intersect each other; and A transparent reflective element, located on a side of the second reflective polarizer away from the display screen and the retroreflective component and tilted at a certain angle relative to the second reflective polarizer; The polarization direction of the light emitted by the display screen is the same as that of the first reflective polarizer and is perpendicular to that of the second reflective polarizer. The polarization direction of the light retroreflected by the retroreflective component is the same as that of the second reflective polarizer.

2. The display device according to claim 1, wherein: The display device further comprises a light blocking structure located at the light exiting side of the second reflective polarizer, wherein the light blocking structure has a first state and a second state; In the first state, the light blocking structure has a light blocking function and is tilted relative to the second reflective polarizer, and the orthographic projection of the light blocking structure on the plane where the second reflective polarizer is located at least partially falls on the second reflective polarizer; In the second state, the light blocking structure has no light blocking function and is located outside the light exiting surface of the second reflective polarizer.

3. The display device according to claim 2, wherein: The light shielding structure comprises a light shielding plate and a reel. The light shielding plate is flexible. One end of the light shielding plate is connected to the reel. Under the action of external force, the light shielding plate can be wound around the reel or unfolded.

4. The display device according to claim 2, wherein: The light blocking structure includes a light blocking plate and a push-pull member, one end of the light blocking plate is fixed, and the push-pull member is fixed to one end of the light blocking plate; the light blocking plate is elastic, and under the action of an external force acting on the push-pull member, the push-pull member can drive the light blocking plate to be expanded or not expanded.

5. The display device according to claim 2, wherein: The light blocking structure comprises a light blocking plate and a rotating shaft, the rotating shaft is fixed, and one end of the light blocking plate is sleeved on the rotating shaft; Under the action of external force, the light blocking plate can rotate on the rotating shaft.

6. The display device according to any one of claims 2 to 5, wherein: The light blocking structure includes a first light blocking plate and a second light blocking plate, the first light blocking plate and the second light blocking plate are located on one side of the light emitting surface of the second reflective polarizer and are respectively inclined relative to the second reflective polarizer, and the extension directions of the first light blocking plate, the second light blocking plate and the second reflective polarizer intersect each other.

7. The display device according to claim 6, wherein: The display device also includes an ambient light brightness detection element connected to the display screen; The ambient light brightness detection element is configured to determine, based on the brightness of the ambient light, whether one of the first light baffle and the second light baffle is in the first state, and display the determination result on the display screen.

8. The display device according to claim 6, wherein: The first light blocking plate and the retroreflective component are located at the same end of the second reflective polarizer, and the second light blocking plate and the display screen are located at the same end of the second reflective polarizer.

9. The display device according to any one of claims 2 to 5, wherein: The light blocking structure includes a light blocking plate, and the position of the light blocking plate is variable.

10. The display device according to claim 9, wherein: The light blocking plate is located at one end of the second reflective polarizer close to the transparent reflective element.

11. The display device according to claim 9, wherein: The light blocking plate is located at an end of the second reflective polarizer away from the transparent reflective element.

12. The display device according to any one of claims 2 to 5, wherein: The display device is a vehicle-mounted display device, and the transparent reflective element is a vehicle-mounted transparent glass.

13. The display device according to any one of claims 2 to 5, wherein: The material of the light blocking structure is one of a black light absorbing material and an electrochromic material.

14. The display device according to claim 13, wherein: The electrochromic material is black when powered on and transparent when not powered on.

15. The display device according to any one of claims 2 to 5, wherein: The light blocking structure is a polarizing plate whose polarization direction is perpendicular to the polarization direction of the second reflective polarizing plate.

16. The display device according to claim 2, wherein: The light emitted from the first reflective polarizer and incident on the surface of the second reflective polarizer passes through the second reflective polarizer after passing through the retroreflective component and forms a first image on the light-emitting side of the second reflective polarizer, wherein the first image is a real image and is mirror-symmetrical with the image displayed on the display screen; The light emitted from the first reflective polarizer and directly incident on the retroreflective component is retroreflected to the surface of the first reflective polarizer and reflected on the surface of the first reflective polarizer to form a reflected light beam. The reflected light beam passes through the second reflective polarizer and is reflected on the transparent reflective element to form a second image on the side of the transparent reflective element away from the second reflective polarizer. The second image is a virtual image and is mirror-symmetrical to the image displayed on the light-emitting surface of the second reflective polarizer.

17. The display device according to claim 1, wherein: The included angle between the first reflective polarizer and the second reflective polarizer is in the range of 30°-80°.

18. The display device according to claim 1 or 17, wherein: The included angle between the first reflective polarizer and the second reflective polarizer is 45°.

19. The display device according to claim 1, wherein: The light efficiency utilization rate of the display device is greater than or equal to 40%.

20. The display device according to claim 1, wherein: The angle between the transparent reflective element and the second reflective polarizer is an acute angle or an obtuse angle.

Images