Display device and electronic apparatus

Abstract

The embodiment of the invention provides a display device and electronic equipment, the display device comprises a display element, a light splitting element and a curved mirror, the light splitting element is arranged on the light emitting side of the display element, the light splitting element is obliquely arranged along a principal ray axis, the light splitting element comprises a spectroscope, and the curved mirror is arranged on the side, away from the light splitting element, of the display element, when the display device works, the display element emits light to the light splitting element, the light splitting element reflects the light to the curved mirror, and the curved mirror reflects the light back to the light splitting element and emits the light out of the light splitting element. The transmission surface of the spectroscope is the cylindrical surface, so that the spectroscope has focal power, imaging spots of the display device can be reduced, the field curvature performance of the display device can be improved, the imaging definition of the display device is improved, and the imaging effect of the display device is improved.

Description

Technical Field

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

[0002] With the development of display technology, in order to avoid myopia caused by long-term continuous close-up use of the eyes, optical systems are used to adjust the light to increase the imaging distance in a smaller space, thereby reducing visual fatigue and the risk of myopia. Figure 1 As shown, the existing optical system uses a display, a light splitting and combining element and a concave reflector to increase the imaging distance. After the light emitted by the display is irradiated to the light splitting and combining element, it will be reflected by the light splitting and combining element to the concave reflector. The concave reflector will present a virtual image, and the distance of the virtual image is far, thereby increasing the distance between the human eye and the image, reducing visual fatigue and the risk of myopia. However, in actual use, it is found that the imaging effect of this optical system is poor.

[0003] Therefore, the existing optical system has the technical problem of poor imaging effect. Summary of the invention

[0004] The embodiments of the present application provide a display device and an electronic device to solve the technical problem that the existing optical system has poor imaging effect.

[0005] In order to achieve the above object, according to a first aspect of the present application, a display device is provided, the display device comprising:

[0006] Display components;

[0007] A beam splitter element is arranged on the light-emitting side of the display element, the beam splitter element is arranged obliquely along the principal light axis, and the beam splitter element includes a beam splitter;

[0008] A curved mirror, arranged on a side of the display element away from the light splitting element;

[0009] The transmission surface of the beam splitter is a cylinder. When the display device is working, the display element emits light to the beam splitter element, the beam splitter element reflects the light to the curved mirror, and the curved mirror reflects the light back to the beam splitter element and emits it from the beam splitter element.

[0010] Optionally, the transmission surface of the beam splitter is a concave surface, or the transmission surface of the beam splitter is a convex surface.

[0011] Optionally, the transmission surface of the beam splitter is an aspherical surface or a free-form surface.

[0012] Optionally, the radius of curvature of the transmission surface of the beam splitter is greater than or equal to 3000 mm.

[0013] Optionally, the spectroscopic element further includes a first polarizer, a polarizing reflective film and a first quarter-wave plate, wherein the first polarizer is arranged on a side of the spectroscope close to the display element, the polarizing reflective film is arranged on a side of the first polarizer close to the display element, and the first quarter-wave plate is arranged on a side of the polarizing reflective film close to the display element.

[0014] Optionally, the display element includes a display panel, a second polarizer and a second quarter-wave plate, the second polarizer is arranged on a side of the display panel close to the beam splitter element, and the second quarter-wave plate is arranged on a side of the second polarizer close to the beam splitter element.

[0015] Optionally, the beam splitter element further comprises an anti-reflection film, and the anti-reflection film is arranged on a side of the beam splitter away from the display element.

[0016] Optionally, the angle between the beam splitter and the principal light axis is in a range of 30 to 60 degrees, the angle between the display element and the principal light axis is in a range of 10 to 40 degrees, and the angle between the curved mirror and the principal light axis is in a range of 0 to 30 degrees.

[0017] Optionally, the distance between the center of the beam splitting element and the center of the curved mirror ranges from 50 mm to 100 mm.

[0018] According to a second aspect of the present application, an electronic device is provided, which includes a display device as described in any one of the above embodiments.

[0019] The embodiments of the present application provide a display device and an electronic device, wherein the display device includes a display element, a beam splitter element and a curved mirror, wherein the beam splitter element is arranged on the light emitting side of the display element, the beam splitter element is arranged obliquely along the main light axis, the beam splitter element includes a beam splitter, and the curved mirror is arranged on the side of the display element away from the beam splitter element, wherein the transmission surface of the beam splitter is a cylinder, and when the display device is working, the display element emits light to the beam splitter element, the beam splitter element reflects the light to the curved mirror, the curved mirror reflects the light back to the beam splitter element and emits the light from the beam splitter element; by making the transmission surface of the beam splitter a cylinder, the beam splitter has optical focal length, thereby reducing the imaging spot of the display device, improving the field curvature performance of the display device, thereby improving the imaging clarity of the display device, and improving the imaging effect of the display device.

[0020] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0022] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0023] Figure 1 It is a schematic diagram of an existing optical system provided in an embodiment of the present application.

[0024] Figure 2 A schematic diagram of a display device provided in an embodiment of the present application.

[0025] Figure 3 A schematic diagram of a spectroscopic element provided in an embodiment of the present application.

[0026] Figure 4 A schematic diagram of a comparative display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] like Figure 1 As shown, the existing optical system includes a display 11, a light splitting and combining element 12 and a concave reflector 13. Figure 1 As can be seen in the figure, the light 14 emitted by the display 11 will irradiate the light splitting and combining element 12, and part of the light will be reflected by the light splitting and combining element 12 to the concave reflector 13, and the concave reflector 13 will reflect the light and then enter the human eye through the light splitting and combining element 12. When the human eye looks at the optical system on the right side of the light splitting and combining element 12, it will see a virtual image 15. Figure 1It can be seen that the virtual image is formed after the light is reflected multiple times by the optical system, so that the distance between the virtual image and the human eye is larger, and the distance between the human eye and the image is increased in a smaller space, reducing visual fatigue and the risk of myopia. However, it can be seen that the light splitting and combining elements in the optical system have a certain transmittance-reflection ratio, and the imaging light will reach the beam splitter twice, resulting in a large loss of light emitted by the display, and the light emitted by the display can directly enter the human eye without being amplified, which causes greater interference and leads to poor imaging effect. Therefore, the existing optical system has the technical problem of poor imaging effect.

[0029] In view of the above problems, the embodiments of the present application provide a display device and an electronic component to solve the above technical problems.

[0030] Figure 2 A schematic diagram of a display device provided in an embodiment of the present application. Figure 3 A schematic diagram of a spectroscopic element provided in an embodiment of the present application. Figure 4 A schematic diagram of a comparative display device provided in an embodiment of the present application.

[0031] like Figure 2 , Figure 3 As shown, an embodiment of the present application provides a display device, and the display device 2 includes:

[0032] Display element 21;

[0033] A beam splitter element 22 is disposed on the light-emitting side of the display element 21 , the beam splitter element 22 is tilted along the principal light axis 24 , and the beam splitter element 22 includes a beam splitter 221 ;

[0034] A curved mirror 23, disposed on a side of the display element 21 away from the light splitting element 22;

[0035] The transmission surface 221a of the beam splitter 221 is a cylinder. When the display device 2 is working, the display element 21 emits light to the beam splitter 22, the beam splitter 22 reflects the light to the curved mirror 23, and the curved mirror 23 reflects the light back to the beam splitter 22 and emits it from the beam splitter 22.

[0036] An embodiment of the present application provides a display device, which includes a display element, a beam splitter element and a curved mirror. The beam splitter element is arranged on the light emitting side of the display element, and the beam splitter element is arranged obliquely along the main light axis. The beam splitter element includes a beam splitter, and the curved mirror is arranged on the side of the display element away from the beam splitter element, wherein the transmission surface of the beam splitter is a cylinder. By making the transmission surface of the beam splitter a cylinder, the beam splitter has optical focal length, which can reduce the imaging spot of the display device, improve the field curvature performance of the display device, thereby improving the imaging clarity of the display device and improving the imaging effect of the display device.

[0037] Specifically, the transmission surface of the beam splitter refers to a surface of the beam splitter that receives the light emitted by the display element and the light reflected by the curved mirror.

[0038] Specifically, compared with the current optical system in which the beam splitter uses a plane mirror and the reflector uses a curved mirror, only the curved reflector has optical power, and there are fewer variables that can be optimized, while the plane beam splitter only plays the role of folding the light path, resulting in poor imaging performance and low degree of freedom of the optical system. In the embodiment of the present application, by making the transmission surface of the beam splitter a cylindrical surface, the design freedom of the display device can be improved without increasing the volume of the display device, and the imaging spot of the display device can be reduced, thereby improving the field curvature performance of the display panel.

[0039] Specifically, when the transmission surface of the beam splitter is changed from a plane to a curved surface (the curved surface here refers to a bend with curvature in at least two directions of 360 degrees, including but not limited to a spherical surface and a biconical surface, and the curved surface in the display device in the embodiment of the present application refers to a cylindrical surface), it is considered that the beam splitter will be bonded with other film layers to improve the light efficiency, and the curved surface bonding process of the film is a stretching and stretching process, which is not uniformly stretched from the center to the edge, which will cause wrinkles to easily appear during the bonding process, and the uneven distribution of tensile stress will cause the performance of the film to change, resulting in leakage of polarized light that should be reflected, and then causing stray light, affecting the display effect, and the curved surface bonding process is complicated and time-consuming. However, the embodiment of the present application makes the transmission surface of the beam splitter a cylindrical surface. When improving the imaging effect of the display device, since the cylindrical surface is a curved surface with curvature in only one direction, there is no uneven stretching in different directions from the center to the edge and uneven distribution of tensile stress in different directions when the film is bonded, so that the display effect is better and the imaging effect is better.

[0040] In some embodiments, the transmission surface 221a of the beam splitter 221 is a concave surface, or the transmission surface 221a of the beam splitter 221 is a convex surface. When setting the transmission surface of the beam splitter, the transmission surface of the beam splitter can be a concave surface, or a convex surface, so that the beam splitter has a certain curvature and bears a certain optical power in the bending direction, so that the imaging spot of the display device is smaller, the field curvature performance of the display device is improved, thereby improving the imaging clarity of the display device and improving the imaging effect of the display device.

[0041] In some embodiments, the transmission surface 221a of the beam splitter 221 is one of an aspherical surface and a free-form surface. By making the transmission surface of the beam splitter one of an aspherical surface and a free-form surface, the beam splitter has a certain curvature and bears a certain optical focal length in the bending direction, so that the imaging spot of the display device is smaller, the field curvature performance of the display panel is improved, thereby improving the imaging clarity of the display panel and improving the imaging effect of the display panel. When the beam splitter is attached to other film layers, since the cylindrical surface is a curved surface with curvature in only one direction, there is no uneven stretching in different directions from the center to the edge and uneven distribution of tensile stress in different directions when the film is attached, so that the display effect is better and the imaging effect is better.

[0042] Specifically, the above embodiments are described by taking the transmission surface of the beam splitter as an aspherical surface and a free-form surface as an example, but the embodiments of the present application are not limited thereto, and the transmission surface of the beam splitter may be other curved surfaces.

[0043] Specifically, the beam splitter further includes a surface disposed opposite to the transmission surface, and the surface disposed opposite to the transmission surface may be a plane or a cylinder.

[0044] In some embodiments, the radius of curvature of the transmission surface 221a of the beam splitter 221 is greater than or equal to 3000 mm. By making the radius of curvature of the transmission surface of the beam splitter greater than or equal to 3000 mm, the curvature of the beam splitter is smaller, so that when the beam splitter is formed, the performance of other film layers is prevented from being deteriorated when other film layers are attached, thereby improving the imaging effect of the display device.

[0045] Specifically, considering that the greater the degree of curvature of the beam splitter is when the film layer is attached, the more difficult it is to attach, and it is more likely to warp later, and the greater the degree of bending, the higher the requirements for the film layer, which can easily lead to film layer failure when attaching the film layer, therefore, the radius of curvature of the transmission surface of the beam splitter can be made greater than or equal to 3000 mm, so that the bending angle of the beam splitter is smaller, thereby avoiding failure of other film layers when attaching other film layers.

[0046] In some embodiments, the bending direction of the transmission surface of the beam splitter is parallel to the connection direction of the left and right pupils of the human eye, or the bending direction of the transmission surface of the beam splitter is perpendicular to the connection direction of the left and right pupils of the human eye. That is, when the beam splitter is set, the bending direction of the beam splitter can be bent toward the line connecting the left and right pupils of the human eye, or the bending direction of the beam splitter is bent away from the line connecting the left and right pupils of the human eye, or it can be bent toward the vertical line connecting the left and right pupils of the human eye, or it can be bent away from the vertical line connecting the left and right pupils of the human eye, so that the beam splitter has a certain curvature, so that the imaging spot of the display device can be smaller, the field curvature performance of the display device is improved, thereby improving the imaging clarity of the display device and improving the imaging effect of the display device.

[0047] Specifically, the above embodiments are described by taking the bending direction of the transmission surface of the beam splitter as parallel to the connection direction of the left and right pupils of the human eye, or the bending direction of the transmission surface of the beam splitter as perpendicular to the connection direction of the left and right pupils of the human eye as an example, but the embodiments of the present application are not limited to this. The transmission surface of the beam splitter can be a cylinder, and its bending direction can be other directions.

[0048] In some embodiments, Figure 3 As shown, the beam splitter element 22 further includes a first polarizer 222, a polarizing reflective film 223 and a first quarter wave plate 224. The first polarizer 222 is arranged on the side of the beam splitter 221 close to the display element 21, the polarizing reflective film 223 is arranged on the side of the first polarizer 222 close to the display element 21, and the first quarter wave plate 224 is arranged on the side of the polarizing reflective film 223 close to the display element 21. By arranging the first polarizer, the polarizing reflective film and the first quarter wave plate on the beam splitter element, the light can be adjusted by the first polarizer, the polarizing reflective film and the first quarter wave plate to convert the light into polarized light. When the polarizer and the quarter wave plate are arranged on other elements, the light efficiency of the display device can be improved by controlling the transmission and reflection of polarized light.

[0049] Specifically, it can be understood that, since the beam splitter has a certain curvature, when attaching the first polarizer, the polarizing reflective film and the first quarter wave plate, each film layer will have a certain curvature, so that the first polarizer, the polarizing reflective film and the first quarter wave plate can be attached to the beam splitter.

[0050] In some embodiments, Figure 2 As shown, the display element 21 includes a display panel 211, a second polarizer 212 and a second quarter wave plate 213, wherein the second polarizer 212 is arranged on a side of the display panel 211 close to the beam splitter 22, and the second quarter wave plate 213 is arranged on a side of the second polarizer 212 close to the beam splitter 22. By arranging the second polarizer and the second quarter wave plate on the display panel, and arranging the first polarizer, the polarizing reflective film and the first quarter wave plate on the beam splitter, the light emitted by the display panel becomes linearly polarized light after passing through the second polarizer, and then the light is optically rotated by the second quarter wave plate, and then the light passes through the first quarter wave plate and is reflected by the polarizing reflective film, and the light reflected by the polarizing reflective film passes through the first quarter wave plate and is reflected by the curved mirror, and then passes through the first quarter wave plate and the polarizing reflective film, and then is emitted from the first polarizer and the beam splitter, so that the light of the display panel can be fully utilized, light loss is avoided, the light efficiency of the display device is improved, and the optical performance of the display device is improved.

[0051] Specifically, by arranging a second polarizer and a second quarter-wave plate on the display panel, and arranging a first polarizer, a polarizing reflective film, and a first quarter-wave plate on the beam splitter, the light of the display panel will be converted into polarized light, and through the control of each polarizer, quarter-wave plate, and polarizing reflective film, only the light emitted by the display panel can pass through the beam splitter to enter the human eye, and stray light cannot pass through each film layer, thereby avoiding the stray light from affecting the display effect. In addition, by making the polarized light emitted from the display element reflected by the polarizing reflective film, and then reflected by the curved mirror and then emitted from the beam splitter, it is avoided that part of the light directly passes through the beam splitter to form stray light, thereby improving the full utilization of the light of the display panel by the display device and improving the light efficiency of the display device.

[0052] Specifically, a quarter wave plate is made of a uniform polycarbonate sheet that is stretched in one direction multiple times to cause a twist in the molecular chain and form a specific phase distribution. If the quarter wave plate is subjected to curved surface bonding (the curved surface here refers to a bend with curvature in at least two directions out of 360 degrees, including but not limited to a spherical surface and a biconical surface. The curved surface in the display device in the embodiment of the present application refers to a cylindrical surface), it is equivalent to stretching in all directions, destroying the original molecular arrangement, so that the polycarbonate sheet is no longer one-quarter delayed after being retracted, making it easy to generate polarized light leakage when light is glaring. The light-transmitting film of the spectroscope in the embodiment of the present application is a cylindrical surface, so that the quarter wave plate is stretched in only one direction, avoiding uneven stretching in different directions and uneven distribution of tensile stress in different directions, which may cause changes in the performance of the quarter wave plate.

[0053] Specifically, when the radius of curvature of the transmission surface of the beam splitter is greater than or equal to 3000 mm, when a polarizer, a quarter wave plate and a polarized reflective film are attached to the beam splitter, since the bending curvature of the beam splitter is small, the performance of each film will not be deteriorated when the polarizer, a quarter wave plate and a polarized reflective film are attached, thereby improving the performance of the display device.

[0054] Specifically, Figure 2 , Figure 3 As shown, after the display panel 211 emits the light 25, the light 25 will pass through the second polarizer and the second quarter-wave plate, then pass through the first quarter-wave plate and be reflected by the polarizing reflective film, then pass through the first quarter-wave plate again and be reflected by the curved mirror, and then the light reflected by the curved mirror will pass through the first quarter-wave plate again and pass through the polarizing reflective film, and then pass through the first polarizer and the beam splitter in sequence to exit, and the human eye will see a virtual image (not shown in the figure), thereby increasing the distance between the human eye and the image in a smaller space and avoiding problems such as myopia caused by closer distances.

[0055] In some embodiments, Figure 3As shown, the beam splitter element 22 further includes an anti-reflection film 225, which is disposed on a side of the beam splitter 221 away from the display element 21. By disposing the anti-reflection film on the side of the beam splitter away from the display panel, when external light is irradiated on the anti-reflection film, it can be absorbed by the anti-reflection film, thereby preventing the external light from affecting the display effect.

[0056] Specifically, the anti-reflection film may also have an anti-fingerprint function, thereby improving the clarity of the display device, preventing fingerprints and reflected light from affecting the display effect, and improving the imaging effect of the display device.

[0057] Specifically, the focal length of the beam splitter in the cylindrical bending direction ranges from 0.01D to 2D (D is diopter). By making the focal length of the beam splitter in the cylindrical bending direction range from 0.01D to 2D, the display device has a better imaging effect when displaying.

[0058] In some embodiments, Figure 2 As shown, the angle range a between the beam splitter 22 and the principal light axis 24 is 30 to 60 degrees, the angle range b between the display element 21 and the principal light axis 24 is 10 to 40 degrees, and the angle range c between the curved mirror 23 and the principal light axis 24 is 0 to 30 degrees. By making the angle range between the beam splitter and the principal light axis 30 to 60 degrees, the angle range between the display element and the principal light axis 10 to 40 degrees, and the angle range between the curved mirror and the principal light axis 0 to 30 degrees, the imaging effect and the display effect can be improved.

[0059] In some embodiments, Figure 2 As shown, the distance range L1 between the center of the beam splitter 22 and the center of the curved mirror 23 is 50 mm to 100 mm. By making the distance range between the center of the beam splitter 22 and the center of the curved mirror 23 50 mm to 100 mm, the imaging effect and the display effect can be improved.

[0060] Specifically, the optical path range of the center of the beam splitter element and the center of the curved mirror in the central field of view is 100 mm to 200 mm, and the distance between the human eye and the center of the beam splitter element is generally 300 mm to 500 mm, so that the distance between the center of the beam splitter element and the center of the curved mirror is 50 mm to 100 mm, and the optical path range of the center of the beam splitter element and the center of the curved mirror in the central field of view is 100 mm to 200 mm, the angle range of the beam splitter element and the main light axis is 30 degrees to 60 degrees, the angle range of the display element and the main light axis is 10 degrees to 40 degrees, and the angle range of the curved mirror and the main light axis is 0 degrees to 30 degrees, which can improve the imaging effect and the display effect.

[0061] Specifically, the curved mirror may be a concave reflecting mirror.

[0062] At the same time, in order to illustrate the improvement in the performance of the display device in the embodiment of the present application, the embodiment of the present application provides a comparative display device 3. It can be understood that the comparative display device cannot be regarded as the prior art. The comparative display device 3 includes a display device 31, a spectroscopic device 32 and a reflective device 33. The spectroscopic device 32 is tilted along the main optical axis 34. The display device 31 of the comparative display device 3 can be the same as the display element in the present application in structure and size. The spectroscopic device 32 in the comparative display device 3 has the same film layer structure and the same film layer order as the spectroscopic element in the present application. The difference between the spectroscopic device in the comparative display device 3 and the spectroscopic element in the present application lies in that the transmission surface of the spectroscope in the present application is a cylinder, and the transmission surface of the spectroscope 32 in the comparative display device 3 is a plane. Correspondingly, each film layer located on the spectroscope in the present application has a certain curvature, and each film layer in the comparative display device is a plane. The reflective device 33 in the comparative display device 3 can be the same as the curved mirror in the present application, and the relative positions of the display device, the spectroscopic device and the reflective device in the comparative display device can be the same as the relative positions of the display element, the spectroscopic element and the curved mirror in the present application.

[0063] Based on the comparative display device and the display device in the embodiment of the present application (both of which have no anti-reflection film), the following table is obtained by simulating the two:

[0064] Table 1. Comparison of spots between the display device and the display device in the embodiment of the present application under different pupil activity ranges and different viewing angles

[0065]

[0066]

[0067]

[0068] Table 2. Comparison of the best virtual image distance and field curvature in the central field of view of the comparative display device and the display device in the embodiment of the present application under different pupil activity ranges.

[0069]

[0070] Table 3. Comparison of the best virtual image distance and field curvature of display devices at different field angles at the center of the eyebox

[0071]

[0072]

[0073] Table 4. Optimal virtual image distance and field curvature data of the display device in this application at the center of the eyebox at different field angles

[0074] Field of view (degrees) Optimum virtual image distance (mm) Vision (diopter) (-15.5，8.7) -5462.38 -0.1831 (-15.5，0) -10144.40 -0.0986 (-15.5，-8.7) -10123.94 -0.0988 (0，8.7) -9437.12 -0.1060 (0，0) -9269.33 -0.1079 (0，-8.7) -9385.22 -0.1066 (15.5，8.7) -9096.75 -0.1099 (15.5，0) -6240.73 -0.1602 (15.5，-8.7) -5404.80 -0.1850 Field curvature (diopter) -0.0864

[0075] Among them, the eyebox in Table 1 and Table 2 refers to the range of pupil activity (generally a rectangle), the eyebox position refers to the location of the pupil on different plane coordinates, the center point of this coordinate system is at the center of the above rectangle, and the horizontal and vertical coordinates in the eyebox position represent the position coordinates in the horizontal and vertical directions of the plane coordinate system from the normal viewing direction of the human eye, respectively, in millimeters. The field of view in Table 1, Table 3 and Table 4 refers to the range of human eye viewing (generally a rectangle), the center point of the rectangle is the central field of view, that is, (0, 0), the units of the horizontal and vertical coordinates are degrees, and the horizontal and vertical coordinates of the field of view angle represent the position coordinates in the horizontal and vertical directions in the plane coordinate system from the normal viewing direction of the human eye. The RMS in the plane reflection RMS spot stands for the root mean square average, which refers to an average value algorithm of countless light rays on the imaging plane under each field of view angle, representing the degree of light convergence. The smaller the value, the clearer the image. The plane reflection RMS spot represents the parameters of the imaging spot in the comparison display device, and the aspherical cylindrical reflection RMS spot represents the parameters of the imaging spot of the display device in this application, in microns.

[0076] It can be seen from Table 1 that the average value of the plane reflection RMS spot in the comparative display device is 32.9 microns, and the average value of the aspherical cylindrical reflection RMS spot in the embodiment of the present application is 32.49 microns, that is, the average value of the imaging spot of the display device in the embodiment of the present application is smaller, indicating that the imaging of the display device in the embodiment of the present application is clearer.

[0077] The optimal virtual image distance for plane reflection in Table 2 refers to the optimal virtual image distance in the comparison display device, and the optimal virtual image distance for aspherical cylindrical reflection refers to the optimal virtual image distance of the display device in the embodiment of the present application. This parameter refers to the distance when the virtual image is clearest, and the unit is millimeter; field curvature refers to the difference in distance when the virtual image positions are clearest at different viewing angles, and the unit is diopter. It can be seen from Table 2 that the field curvature in the comparison display device is -0.101 diopter, and the field curvature of the display device in the embodiment of the present application is -0.086 diopter.

[0078] The optimal virtual image distance in Tables 3 and 4 refers to the optimal virtual image distance at different viewing angles, in millimeters, and the visual acuity refers to the degree of the visual angle of the naked eye of a person, in diopters. It can be seen from Tables 3 and 4 that the field curvature in the comparative display device is -0.1017 diopters, and the field curvature of the display device in the embodiment of the present application is -0.0864 diopters. It can be seen from Tables 2, 3 and 4 that the field curvature performance of the display device in the embodiment of the present application is more excellent, and the field curvature performance includes the difference in the optimal virtual image distance of each field of view under a fixed pupil position and the difference in the optimal virtual image distance of the central field of view between each pupil position. The performance of the display device in the embodiment of the present application is more excellent, thereby improving the imaging effect of the display device.

[0079] From the above analysis, it can be seen that the display device in the embodiment of the present application has higher imaging clarity and better field curvature performance, which improves the imaging effect of the display device.

[0080] At the same time, an embodiment of the present application provides an electronic device, which includes a display device as described in any of the above embodiments.

[0081] Specifically, the electronic device may include a housing and a display device disposed in the housing.

[0082] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0085] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display device, characterized in that: include: Display components; A beam splitter element is arranged on the light-emitting side of the display element, the beam splitter element is arranged obliquely along the principal light axis, and the beam splitter element includes a beam splitter; A curved mirror, arranged on a side of the display element away from the light splitting element; The transmission surface of the beam splitter is a cylinder. When the display device is working, the display element emits light to the beam splitter, the beam splitter reflects the light to the curved mirror, and the curved mirror reflects the light back to the beam splitter and emits it from the beam splitter.

2. The display device according to claim 1, characterized in that The transmission surface of the beam splitter is a concave surface, or the transmission surface of the beam splitter is a convex surface.

3. The display device according to claim 1, characterized in that The transmission surface of the beam splitter is one of an aspherical surface and a free-form surface.

4. The display device according to claim 1, characterized in that The radius of curvature of the transmission surface of the beam splitter is greater than or equal to 3000 mm.

5. The display device according to any one of claims 1 to 4, characterized in that: The spectroscopic element also includes a first polarizer, a polarizing reflective film and a first quarter-wave plate. The first polarizer is arranged on a side of the spectroscope close to the display element, the polarizing reflective film is arranged on a side of the first polarizer close to the display element, and the first quarter-wave plate is arranged on a side of the polarizing reflective film close to the display element.

6. The display device according to claim 5, characterized in that: The display element includes a display panel, a second polarizer and a second quarter-wave plate, wherein the second polarizer is arranged on a side of the display panel close to the beam splitter, and the second quarter-wave plate is arranged on a side of the second polarizer close to the beam splitter.

7. The display device according to claim 5, characterized in that: The beam splitter element further comprises an anti-reflection film, and the anti-reflection film is arranged on a side of the beam splitter away from the display element.

8. The display device according to claim 1, characterized in that: The angle between the beam splitter and the principal light axis is in the range of 30 to 60 degrees, the angle between the display element and the principal light axis is in the range of 10 to 40 degrees, and the angle between the curved mirror and the principal light axis is in the range of 0 to 30 degrees.

9. The display device according to claim 1, characterized in that: The distance between the center of the light splitting element and the center of the curved mirror ranges from 50 mm to 100 mm.

10. An electronic device, characterized in that: Comprising the display device as claimed in any one of claims 1 to 9.

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