Display apparatus and display device

Abstract

A display apparatus (100) and a display device. The display apparatus (100) comprises a display screen (11), a first reflector (12), a second reflector (13), and a window (14). On a chief ray axis (zz), the window (14) and the second reflector (13) are arranged spaced apart. The first reflector (12) is located on the emergent side of the display screen (11) and is arranged outside of the chief ray axis (zz). The first reflector (12) is configured to reflect light emitted by the display screen (11) to the second reflector (13), and the second reflector (13) is configured to reflect the reflected light of the first reflector (12) and enable light to pass through the window (14).

Description

Display devices and display equipment Technical Field

[0001] This application relates to the field of display technology, specifically to a display device and display equipment. Background Technology

[0002] In patent document CN117215072A, entitled "Optical System and Imaging Device," a non-polarizing beam splitter is proposed as a reflective polarizing film. This film achieves high luminous efficiency while folding light through the polarization state conversion characteristics of the imaging optical path. However, the general reflective polarizing film used in this solution (such as DEBF) exhibits noticeable orange peel texture, severely affecting the sharpness of the virtual image. Furthermore, orange peel-improving reflective polarizing films (such as IQPS and IQPE) are expensive, resulting in no cost advantage for the overall system. Invention Overview

[0003] This application provides a display device and display equipment that can achieve high luminous efficiency while meeting the requirements of low overall cost and high virtual image clarity.

[0004] On one hand, embodiments of this application provide a display device having a main optical axis, the display device comprising: a display screen, a first reflector, a second reflector, and a viewing window;

[0005] The window and the second reflector are arranged at intervals along the main ray axis; the first reflector is located on the light-emitting side of the display screen and is disposed outside the main ray axis.

[0006] The first reflector is configured to reflect light emitted from the display screen to the second reflector, and the second reflector is configured to reflect the reflected light from the first reflector and allow the light to pass through the window.

[0007] On the other hand, correspondingly, embodiments of this application also provide a display device, which includes the display apparatus as described in any of the above embodiments. Attached Figure Description

[0008] Figure 1 is a schematic diagram of the structure of the display device provided in an embodiment of this application;

[0009] Figure 2 is a schematic diagram of another structure of the display device provided in an embodiment of this application;

[0010] Figure 3 is a schematic diagram of the light conversion structure of the display device provided in an embodiment of this application;

[0011] Figure 4 is another structural schematic diagram of the light conversion of the display device provided in the embodiment of this application;

[0012] Figure 5 is a schematic diagram of the structure of the display device provided in an embodiment of this application. Embodiments of the present invention

[0013] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific implementation methods described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, the embodiments can be combined with each other but will not be described in detail one by one. Unless otherwise stated, the directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device; the terms "first," "second," "third," etc. are only used as markings and do not impose numerical requirements or establish a sequence.

[0014] On one hand, embodiments of this application provide a display device having a main optical axis, the display device comprising: a display screen, a first reflector, a second reflector, and a viewing window;

[0015] The window and the second reflector are arranged at intervals along the main ray axis; the first reflector is located on the light-emitting side of the display screen and is disposed outside the main ray axis.

[0016] The first reflector is configured to reflect light emitted from the display screen to the second reflector, and the second reflector is configured to reflect the reflected light from the first reflector and allow the light to pass through the window.

[0017] Optionally, in some embodiments of this application, the optical path lengths of the first reflector and the second reflector are between 100 mm and 200 mm in the central field of view of the display device.

[0018] Optionally, in some embodiments of this application, the direction parallel to the main ray axis is a first direction, and in the first direction, the distance from the center of the window to the center of the second reflector is between 50 mm and 150 mm.

[0019] Optionally, in some embodiments of this application, the thickness direction of the display device is a second direction, which is perpendicular to the first direction, and the first reflector and the display screen are located above the viewing window;

[0020] Based on the second direction, the central axis of the display screen is deflected clockwise by a first angle, the central axis of the first reflector is deflected clockwise by a second angle, and the central axis of the second reflector is deflected counterclockwise by a third angle;

[0021] The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

[0022] Optionally, in some embodiments of this application, the thickness direction of the display device is a second direction, which is perpendicular to the first direction, and the first reflector and the display screen are located below the viewing window;

[0023] Based on the second direction, the central axis of the display screen is deflected counterclockwise by a first angle, the central axis of the first reflector is deflected counterclockwise by a second angle, and the central axis of the second reflector is deflected clockwise by a third angle;

[0024] The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

[0025] Optionally, in some embodiments of this application, in the first direction, the distance from the center of the window to the center of the first reflector is less than or equal to 20 millimeters.

[0026] Optionally, in some embodiments of this application, in the second direction, the distance from the center of the window to the center of the first reflector is between 10 mm and 20 mm.

[0027] Optionally, in some embodiments of this application, the display screen includes a display panel and a first polarizer disposed on the light-emitting side of the display panel, and the viewing window includes a second polarizer, which is a circular polarizer.

[0028] Optionally, in some embodiments of this application, the first polarizer includes a first linear polarizing layer and a first quarter-wave plate, the first quarter-wave plate being located on the side of the first linear polarizing layer away from the display panel, and the angle between the absorption axis of the first linear polarizing layer and the slow axis of the first quarter-wave plate being 45 degrees.

[0029] The second polarizer includes a second linear polarizing layer and a second quarter-wave plate, wherein the second quarter-wave plate is located on the side of the second linear polarizing layer closer to the second reflector;

[0030] The absorption axis of the second linear polarizing layer is perpendicular to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is parallel to the slow axis of the first quarter-wave plate; or, the absorption axis of the second linear polarizing layer is parallel to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is perpendicular to the slow axis of the first quarter-wave plate.

[0031] Optionally, in some embodiments of this application, the first polarizer is a linear polarizer, and the second polarizer includes a second linear polarizing layer and a second quarter-wave plate, wherein the second quarter-wave plate is located on the side of the second linear polarizing layer near the second reflector.

[0032] The fast axis of the second quarter-wave plate is perpendicular or parallel to the transmission axis of the first polarizer. The second quarter-wave plate is configured to transmit light rays that are parallel to the polarization direction of the first polarizer. The transmission axis of the second linear polarizer is parallel to the transmission axis of the first polarizer.

[0033] On the other hand, correspondingly, embodiments of this application also provide a display device, which includes the display apparatus as described in any of the above embodiments.

[0034] The display device of this application embodiment has a main light axis. The display device includes: a display screen, a first reflector, a second reflector, and a viewing window. The viewing window and the second reflector are arranged at intervals on the main light axis. The first reflector is located on the light-emitting side of the display screen and is disposed outside the main light axis. The first reflector is configured to reflect the light emitted by the display screen to the second reflector, and the second reflector is configured to reflect the reflected light from the first reflector and allow the light to pass through the viewing window.

[0035] In this embodiment of the application, the display device uses a first reflector instead of a reflective polarizing film and places the first reflector outside the main ray axis, which not only achieves high light efficiency but also meets the requirements of low cost and high definition.

[0036] This application provides a display device and a display apparatus, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0037] Referring to Figure 1, this application embodiment provides a display device 100 having a main ray axis z. The display device 100 includes a display screen 11, a first reflector 12, a second reflector 13, and a viewing window 14.

[0038] On the main ray axis zz, the window 14 and the second reflector 13 are arranged at intervals. The first reflector 12 is located on the light-emitting side of the display screen 11 and is located outside the main ray axis zz.

[0039] The first reflector 12 is configured to reflect the light emitted from the display screen 11 to the second reflector 13. The second reflector 13 is configured to reflect the reflected light from the first reflector 12 and allow the light to pass through the viewing window 14.

[0040] Compared to the technical solutions in the background technology, the reflectivity of non-polarized beam splitters is generally in the range of 15% to 85%. A large portion of the light emitted from the image source will actually pass directly through the beam splitting and combining elements and illuminate the structural components. The reflectivity of the relatively mature light-absorbing structures in current products is generally between 1% and 5%. Therefore, a large portion of the light will still be reflected and become internal stray light that affects the imaging effect.

[0041] It is important to understand that the principal ray axis zz is the direction of light rays within the luminous viewing angle range of the display device 200, coinciding with the direction of light rays along a virtual line connecting the center of the viewing window 14 and the center of the second reflector 13. The human eye has the optimal viewing angle when positioned within the principal ray axis zz.

[0042] The display device 100 of this application replaces the non-polarizing beam splitter with a first reflector 12. Based on the fact that the reflectivity of the first reflector 12 is greater than 85%, and the first reflector 12 is placed outside the main ray axis zz, the integrity and utilization of the light emitted from the reflective display screen are improved, and the risk of internal light interference is reduced. Secondly, compared with the general reflective polarizing film solution, this application improves the clarity of the virtual image. Compared with the orange peel improvement reflective polarizing film, the embodiment of this application can reduce the cost.

[0043] Optionally, the display screen 11 includes a display panel 111 and a first polarizer 112 disposed on the light-emitting side of the display panel 111.

[0044] Optionally, the display panel 111 can be a panel with display function selected from liquid crystal panels, organic light-emitting diode panels, sub-millimeter-level light-emitting diode panels, micro light-emitting diode panels, quantum dot light-emitting diode panels, or electrophoretic panels.

[0045] Secondly, the first polarizer 112 can be either a circular polarizer or a linear polarizer.

[0046] Optionally, the reflecting surface of the first reflecting mirror 12 and the reflecting surface of the second reflecting mirror 13 can each be one of a plane, a sphere, a cylinder, a biconical surface, and a freeform surface.

[0047] Optionally, the central axis of window 14 is perpendicular to the principal ray axis zz, but it is not limited to this. For example, the central axis of window 14 may not be perpendicular to the principal ray axis zz.

[0048] It is understandable that the distance between the human eye and the viewing window 14 is generally between 300 mm and 500 mm, such as 300 mm, 350 mm, 400 mm, 450 mm, or 500 mm, but is not limited to this. For example, depending on the requirements, the distance between the human eye and the viewing window 14 can also be greater than 500 mm.

[0049] Optionally, in some embodiments of this application, the direction parallel to the principal ray axis z is the first direction F1. In the first direction F1, the distance from the center of the window 14 to the center of the second reflector 13 is between 50 mm and 150 mm, for example, it can be 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0050] Optionally, in some embodiments of this application, the optical path lengths of the first reflector 12 and the second reflector 13 in the central field of view of the display device 100 are between 100 mm and 200 mm, for example, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm or 200 mm.

[0051] It should be understood that the central field of view of the display device 100 refers to the viewing angle of the human eye when the human eye is at the center of the display device 100 and viewing the center of the virtual image.

[0052] Optionally, in some embodiments of this application, the thickness direction of the display device 100 is a second direction F2, which is perpendicular to the first direction F1. The first reflector 12 and the display screen 11 are located above the viewing window 14.

[0053] Based on the second direction F2, the central axis of the display screen 11 is deflected clockwise by a first angle a1, the central axis of the first reflector 12 is deflected clockwise by a second angle a2, and the central axis of the second reflector 13 is deflected counterclockwise by a third angle a3.

[0054] The first angle a1 is between 10 degrees and 40 degrees, for example, it can be 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, or 40 degrees. The second angle a2 is between 10 degrees and 20 degrees, for example, it can be 10 degrees, 15 degrees, or 20 degrees. The third angle a3 is between 10 degrees and 30 degrees, for example, it can be 10 degrees, 15 degrees, 20 degrees, 25 degrees, or 30 degrees.

[0055] Optionally, in some embodiments of this application, as shown in FIG2, the first reflector 12 and the display screen 11 are located below the window 14.

[0056] Based on the second direction F2, the central axis of the display screen 11 is deflected counterclockwise by a first angle a1, the central axis of the first reflector 12 is deflected counterclockwise by a second angle a2, and the central axis of the second reflector 13 is deflected clockwise by a third angle a3.

[0057] The first angle a1 is between 10 degrees and 40 degrees, for example, it can be 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, or 40 degrees. The second angle a2 is between 10 degrees and 20 degrees, for example, it can be 10 degrees, 15 degrees, or 20 degrees. The third angle a3 is between 10 degrees and 30 degrees, for example, it can be 10 degrees, 15 degrees, 20 degrees, 25 degrees, or 30 degrees.

[0058] Understandably, the viewing quality of the virtual image is improved by coordinating the distance from the center of the window 14 to the center of the second reflector 13, the optical path of the first reflector 12 and the second reflector 13, and the first angle a1, the second angle a2 and the third angle a3.

[0059] In addition, based on the arrangement of the first reflector 12, the first angle a1 of the display screen 11 is smaller, which can reduce the space in the first direction F1; and the second angle a2 of the first reflector 12 is smaller than the first angle a1, which further reduces the space of the first reflector 12 in the first direction F1.

[0060] Optionally, the second angle a2 is less than or equal to half of the first angle a1, and in the second direction F2, the window 14 and the first reflector 12 at least partially overlap to further reduce the space occupied.

[0061] Optionally, in some embodiments of this application, in the first direction F1, the distance from the center of the window 14 to the center of the first reflector 12 is less than or equal to 20 mm, for example, it can be 0 mm, 5 mm, 10 mm, 15 mm or 20 mm.

[0062] Because the first reflector 12 is tilted, even if the center of the window 14 and the center of the first reflector 12 are offset, the first reflector 12 can still fully cover the window 14 in the second direction F2, so as to save space.

[0063] Optionally, in some embodiments of this application, in the second direction F2, the distance from the center of the window 14 to the center of the first reflector 12 is between 10 mm and 20 mm.

[0064] Understandably, based on the needs of processing and assembly and the consideration of reducing the size of the display device 100, the distance from the center of the first reflector 12 to the center of the window 14 is set to be between 10 mm and 20 mm, for example, it can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0065] Optionally, in some embodiments of this application, the window 14 includes a second polarizer 15. The second polarizer 15 is a circular polarizer.

[0066] The circular polarizer on the window 14 can reduce the impact of stray light from the outside on the interior of the display device 100.

[0067] Optionally, the window 14 includes a transparent substrate 141, and a second polarizer 15 is disposed on the side of the transparent substrate 141 near the second reflector 13.

[0068] The second polarizer 15 is positioned on the side of the transparent substrate 141 close to the second reflector 13, so that the transparent substrate 141 can protect the second polarizer 15 and avoid the risk of the second polarizer 15 being scratched or bumped by external objects.

[0069] Optionally, in some embodiments, the second polarizer 15 may also be disposed on the side of the transparent substrate 141 away from the second reflector 13.

[0070] Optionally, the transparent substrate 141 can be a light-transmitting material, such as a rigid material like glass.

[0071] Optionally, the second polarizer 15 includes a second linear polarizing layer 15a and a second quarter-wave plate 15b, with the second quarter-wave plate 15b located on the side of the second linear polarizing layer 15a near the second reflector 13.

[0072] It is understood that the second linear polarizing layer 15a and the second quarter-wave plate 15b are both disposed on the side of the transparent substrate 141 near the second reflector 13, but this is not a limitation. For example, the second linear polarizing layer 15a and the second quarter-wave plate 15b can both be disposed on the side of the transparent substrate 141 away from the second reflector 13; or the second quarter-wave plate 15b can be disposed on the side of the transparent substrate 141 near the second reflector 13, and the second linear polarizing layer 15a can be disposed on the side of the transparent substrate 141 away from the second reflector 13.

[0073] Optionally, in some embodiments of this application, as shown in FIG3, the first polarizer 112 includes a first linear polarizer 11a and a first quarter-wave plate 11b. The first quarter-wave plate 11b is located on the side of the first linear polarizer 11a away from the display panel 111, and the angle between the absorption axis of the first linear polarizer 11a and the slow axis of the first quarter-wave plate 11b is 45 degrees.

[0074] The absorption axis of the second linear polarizing layer 15a is perpendicular to the absorption axis of the first linear polarizing layer 11a, and the slow axis of the second quarter-wave plate 15b is parallel to the slow axis of the first quarter-wave plate 11b; or, the absorption axis of the second linear polarizing layer 15a is parallel to the absorption axis of the first linear polarizing layer 11a, and the slow axis of the second quarter-wave plate 15b is perpendicular to the slow axis of the first quarter-wave plate 11b.

[0075] As shown in Figure 3, the light emitted from the display panel 111 passes sequentially through a first linear polarizing layer 11a, a first quarter-wave plate 11b, a second quarter-wave plate 15b, and a second linear polarizing layer 15a. The light is converted into circularly polarized light after passing through the first linear polarizing layer 11a and the first quarter-wave plate 11b. The circularly polarized light is then converted into linearly polarized light after passing through the second quarter-wave plate 15b. The polarization direction of this linearly polarized light is parallel or perpendicular to the transmission axis of the first linear polarizing layer 11a, and the polarization direction is the same as the transmission axis of the second linear polarizing layer 15a. The second quarter-wave plate 15b, in conjunction with the second linear polarizing layer 15a, reduces ambient light interference, achieving an effect similar to an optical blackbody in the screen-off state.

[0076] Optionally, in some embodiments of this application, as shown in FIG4, the first polarizer 112 is a linear polarizer. The fast axis of the second quarter-wave plate 15b is perpendicular or parallel to the transmission axis of the first polarizer 112. The second quarter-wave plate 15b is configured to transmit light rays parallel to the polarization direction of the first polarizer 112. The transmission axis of the second linear polarizer layer 15a is parallel to the transmission axis of the first polarizer 112.

[0077] Referring to Figure 4, the light emitted from the display panel 111 passes sequentially through a first polarizer 112, a second quarter-wave plate 15b, and a second linear polarizing layer 15a. The light is converted into linearly polarized light after passing through the first polarizer 112, and remains linearly polarized after passing through the second quarter-wave plate 15b. The polarization direction of this linearly polarized light is parallel to the transmission axis of the first polarizer 112, and the polarization direction is the same as the transmission axis of the second linear polarizing layer 15a. The combination of the second quarter-wave plate 15b and the second linear polarizing layer 15a reduces ambient light interference, achieving an effect similar to an optical blackbody in the screen-off state.

[0078] The embodiment corresponding to Figure 4 saves the first quarter-wave plate 11b compared to the embodiment corresponding to Figure 3.

[0079] It should be noted that Tables 1 and 2 below are comparative data on the imaging speckle and field curvature performance of the display device 100 based on the embodiments corresponding to Figures 1 and 3 and the optical architecture of Figure 7 in the patent document of the background art, under the same optical design parameters (viewing distance of 300 mm, field of view of 31 degrees * 17 degrees, display screen of 5 inches).

[0080]

[0081] Field of view (degrees) Table 2 Optimal virtual image distance (mm) and corresponding diopter (D) of the optical architecture of the background technology Optimal virtual image distance (mm) and corresponding diopter (D) of the optical architecture of the embodiment of this application (-15.5, 8.7) -5131.89 -0.1949 -5647.09 -0.177 (-15.5, 0) -4758.98 -0.2101 -6221.70 -0.161 (-15.5, -8.7) -5252.53 -0.1904 -5843.33 -0.171 (0, 8.7) -6788.94 -0.1473 -4230.10 -0 .236 (0, 0) -12777.12 -0.0783 -8724.50 -0.115 (0, -8.7) -7007.25 -0.1427 -6131.03 -0.163 (15.5, 8.7) -5114.55 -0.1955 -5647.09 -0.177 (15.5, 0) -4754.92 -0.2103 -6221.76 -0.161 (15.5, -8.7) -5226.65 -0.1913 -5843.33 -0.171 -0.1320 -0.122

[0082] As can be seen from the data in Tables 1 and 2, the size of the imaging speckle of the display device 100 in this application embodiment is comparable to that of the imaging speckle in the background technology, and the field curvature performance of the display device 100 in this application embodiment is slightly better than that of the background technology.

[0083] It's important to understand that the smaller the image speckle, the smaller the optical system aberrations, and the clearer the image. A small field curvature value means that the deviation of the optimal virtual image distance position in each observation field is small. When the human eye views the entire image, it does not need to make multiple large adaptive adjustments to reach the clearest position, similar to a television screen being almost flat.

[0084] Referring to Figure 5, this application embodiment also provides a display device 1000, which includes the display device 100 as described in any of the above embodiments.

[0085] It should be noted that the display device 100 of the display device 1000 in this application embodiment has a similar or identical structure to the display device 100 of any of the above embodiments, so it will not be described again here.

[0086] The display device 100 of this application embodiment has a main ray axis zzz. The display device 100 includes a display screen 11, a first reflector 12, a second reflector 13, and a viewing window 14. The viewing window 14 and the second reflector 13 are arranged at intervals along the main ray axis zzz. The first reflector 12 is located on the light-emitting side of the display screen 11 and is disposed outside the main ray axis zzz. The first reflector 12 is configured to reflect the light emitted from the display screen 11 to the second reflector 13, and the second reflector 13 is configured to reflect the reflected light from the first reflector 12 and allow the light to pass through the viewing window 14.

[0087] In this embodiment of the application, the display device 1000 achieves high luminous efficiency and meets the requirements of low cost and high definition by using a first reflector 12 instead of a reflective polarizing film and placing the first reflector 12 outside the main ray axis zz.

[0088] The above provides a detailed description of a display device and display apparatus provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display device having a main optical axis, the display device comprising: Display screen, first reflector, second reflector, and viewing window; The viewing window and the second reflector are arranged at intervals along the main ray axis; The first reflector is located on the light-emitting side of the display screen and is disposed outside the main ray axis; The first reflector is configured to reflect light emitted from the display screen to the second reflector, and the second reflector is configured to reflect the reflected light from the first reflector and allow the light to pass through the window.

2. The display device according to claim 1, wherein, In the central field of view of the display device, the optical path lengths of the first reflector and the second reflector are between 100 mm and 200 mm.

3. The display device according to claim 2, wherein, The direction parallel to the main ray axis is the first direction, and in the first direction, the distance from the center of the window to the center of the second reflector is between 50 mm and 150 mm.

4. The display device according to claim 3, wherein, The thickness direction of the display device is the second direction, which is perpendicular to the first direction. The first reflector and the display screen are located above the viewing window. Based on the second direction, the central axis of the display screen is deflected clockwise by a first angle, the central axis of the first reflector is deflected clockwise by a second angle, and the central axis of the second reflector is deflected counterclockwise by a third angle; The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

5. The display device according to claim 3, wherein, The thickness direction of the display device is a second direction, which is perpendicular to the first direction. The first reflector and the display screen are located below the viewing window. Based on the second direction, the central axis of the display screen is deflected counterclockwise by a first angle, the central axis of the first reflector is deflected counterclockwise by a second angle, and the central axis of the second reflector is deflected clockwise by a third angle; The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

6. The display device according to claim 4 or 5, wherein, In the first direction, the distance from the center of the window to the center of the first reflector is less than or equal to 20 millimeters.

7. The display device according to claim 6, wherein, In the second direction, the distance from the center of the window to the center of the first reflector is between 10 mm and 20 mm.

8. The display device according to any one of claims 1-5, wherein, The display screen includes a display panel and a first polarizer disposed on the light-emitting side of the display panel. The viewing window includes a second polarizer, which is a circular polarizer.

9. The display device according to claim 8, wherein, The first polarizer includes a first linear polarizing layer and a first quarter-wave plate. The first quarter-wave plate is located on the side of the first linear polarizing layer away from the display panel. The angle between the absorption axis of the first linear polarizing layer and the slow axis of the first quarter-wave plate is 45 degrees. The second polarizer includes a second linear polarizing layer and a second quarter-wave plate, wherein the second quarter-wave plate is located on the side of the second linear polarizing layer closer to the second reflector; The absorption axis of the second linear polarizing layer is perpendicular to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is parallel to the slow axis of the first quarter-wave plate; or, the absorption axis of the second linear polarizing layer is parallel to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is perpendicular to the slow axis of the first quarter-wave plate.

10. The display device according to claim 8, wherein, The first polarizer is a linear polarizer, and the second polarizer includes a second linear polarizing layer and a second quarter-wave plate, with the second quarter-wave plate located on the side of the second linear polarizing layer closer to the second reflector. The fast axis of the second quarter-wave plate is perpendicular or parallel to the transmission axis of the first polarizer. The second quarter-wave plate is configured to transmit light rays that are parallel to the polarization direction of the first polarizer. The transmission axis of the second linear polarizer is parallel to the transmission axis of the first polarizer.

11. A display device, comprising a display apparatus, the display apparatus comprising: Having a main optical axis, the display device includes: a display screen, a first reflector, a second reflector, and a viewing window; The window and the second reflector are arranged at intervals along the main ray axis; the first reflector is located on the light-emitting side of the display screen and is disposed outside the main ray axis. The first reflector is configured to reflect light emitted from the display screen to the second reflector, and the second reflector is configured to reflect the reflected light from the first reflector and allow the light to pass through the window.

12. The display device according to claim 11, wherein, In the central field of view of the display device, the optical path lengths of the first reflector and the second reflector are between 100 mm and 200 mm.

13. The display device according to claim 12, wherein, The direction parallel to the main ray axis is the first direction, and in the first direction, the distance from the center of the window to the center of the second reflector is between 50 mm and 150 mm.

14. The display device according to claim 13, wherein, The thickness direction of the display device is the second direction, which is perpendicular to the first direction. The first reflector and the display screen are located above the viewing window. Based on the second direction, the central axis of the display screen is deflected clockwise by a first angle, the central axis of the first reflector is deflected clockwise by a second angle, and the central axis of the second reflector is deflected counterclockwise by a third angle; The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

15. The display device according to claim 13, wherein, The thickness direction of the display device is a second direction, which is perpendicular to the first direction. The first reflector and the display screen are located below the viewing window. Based on the second direction, the central axis of the display screen is deflected counterclockwise by a first angle, the central axis of the first reflector is deflected counterclockwise by a second angle, and the central axis of the second reflector is deflected clockwise by a third angle; The first angle is between 10 degrees and 40 degrees, the second angle is between 10 degrees and 20 degrees, and the third angle is between 10 degrees and 30 degrees.

16. The display device according to claim 14 or 15, wherein, In the first direction, the distance from the center of the window to the center of the first reflector is less than or equal to 20 millimeters.

17. The display device according to claim 16, wherein, In the second direction, the distance from the center of the window to the center of the first reflector is between 10 mm and 20 mm.

18. The display device according to any one of claims 11-15, wherein, The display screen includes a display panel and a first polarizer disposed on the light-emitting side of the display panel. The viewing window includes a second polarizer, which is a circular polarizer.

19. The display device according to claim 18, wherein, The first polarizer includes a first linear polarizing layer and a first quarter-wave plate. The first quarter-wave plate is located on the side of the first linear polarizing layer away from the display panel. The angle between the absorption axis of the first linear polarizing layer and the slow axis of the first quarter-wave plate is 45 degrees. The second polarizer includes a second linear polarizing layer and a second quarter-wave plate, wherein the second quarter-wave plate is located on the side of the second linear polarizing layer closer to the second reflector; The absorption axis of the second linear polarizing layer is perpendicular to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is parallel to the slow axis of the first quarter-wave plate; or, the absorption axis of the second linear polarizing layer is parallel to the absorption axis of the first linear polarizing layer, and the slow axis of the second quarter-wave plate is perpendicular to the slow axis of the first quarter-wave plate.

20. The display device according to claim 18, wherein, The first polarizer is a linear polarizer, and the second polarizer includes a second linear polarizing layer and a second quarter-wave plate, with the second quarter-wave plate located on the side of the second linear polarizing layer closer to the second reflector. The fast axis of the second quarter-wave plate is perpendicular or parallel to the transmission axis of the first polarizer. The second quarter-wave plate is configured to transmit light rays that are parallel to the polarization direction of the first polarizer. The transmission axis of the second linear polarizer is parallel to the transmission axis of the first polarizer.

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