Display device and display terminal

Abstract

The invention relates to a display device and a display terminal. The display device comprises a display panel, a first optical lens and a second optical lens. The emergent light of the display panel forms a first virtual image through the first optical lens and the second optical lens, and the absolute value of the field curvature value is increased in the direction pointing to the peripheral area along the central area of the first virtual image. According to the invention, the light emitted from the light emitting surface of the display panel is reflected to the second optical mirror through the first optical mirror, and finally forms the first virtual image after being reflected by the second optical mirror. As the absolute value of the field curvature value is increased in the direction from the central region of the first virtual image to the peripheral region of the first virtual image, when the human eyes watch the first virtual image, the middle region of the retina is clearly imaged, the edge region of the retina is not clearly imaged, and the eye axis is not easy to grow towards the unclear imaging direction, so that the eye axis cannot be lengthened, and the image quality is improved. Therefore, the problem of impaired vision can be improved.

Description

Technical Field

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

[0002] The retina of the human eye is spherical. When the central area of ​​the retina is clearly imaged, the information of the peripheral vision will converge behind the retina, thus forming peripheral hyperopia defocus. According to the growth law of the human eye axis, the retina tends to grow towards the position of the clear imaging point, which causes the eye axis to become longer and the central clear area will become unclear, thus forming myopia.

[0003] Currently, for display devices on the market, the brightness and clarity of the central area and peripheral area of ​​the picture viewed by the human eye are basically consistent, which will form peripheral hyperopic defocus, thereby causing a decrease in the user's vision.

[0004] Therefore, it is urgent to solve the above technical problems. Summary of the invention

[0005] The embodiments of the present application provide a display device and a display terminal to improve the technical problem of decreased vision caused by peripheral hyperopic defocus when the human eye views the display device.

[0006] In order to achieve the above objectives, in a first aspect, the present application provides a display device, including:

[0007] Display panel;

[0008] A first optical mirror is arranged at a distance on one side of the light emitting surface of the display panel, wherein a reflective surface of the first optical mirror faces the light emitting surface and the reflective surface is arranged at an angle to the light emitting surface, and a direction perpendicular to the light emitting surface is a first direction;

[0009] A second optical mirror is arranged along a second direction with the first optical mirror, and the second optical mirror is disposed on one side of the reflection surface of the first optical mirror, and the second direction is perpendicular to the first direction;

[0010] The outgoing light of the display panel forms a first virtual image through the first optical mirror and the second optical mirror, and the absolute value of the field curvature increases in a direction from the central area of ​​the first virtual image to the peripheral area of ​​the first virtual image.

[0011] Optionally, in a third direction, an absolute value of a difference between a field curvature value at a center of the first virtual image and a field curvature value at a boundary of the first virtual image is greater than or equal to 0.1, and the third direction is perpendicular to both the first direction and the second direction.

[0012] Optionally, in the first direction, an absolute value of a difference between a field curvature value at a center of the first virtual image and a field curvature value at a boundary of the first virtual image is greater than or equal to 0.025.

[0013] Optionally, a value of the optical transfer function corresponding to the central area is greater than or equal to a value of the optical transfer function corresponding to the peripheral area.

[0014] Optionally, in a direction from the central area to the peripheral area, a value of the optical transfer function decreases.

[0015] Optionally, a difference between a value of the optical transfer function corresponding to a field of view angle of 5 degrees and a value of the optical transfer function corresponding to a field of view angle of 10 degrees is a first difference, and the first difference is positively correlated with the relative spatial frequency.

[0016] Optionally, the size of the spot diagram of the central area is greater than the size of the spot diagram of the peripheral area.

[0017] Optionally, the first optical mirror comprises a plane beam splitter, the second optical mirror comprises a curved reflector, the second optical mirror comprises a concave surface and a convex surface opposite to each other, and the concave surface is located on a side of the convex surface close to the first optical mirror.

[0018] Optionally, the field of view angle corresponding to the picture in the central area is 0 degrees to 5 degrees, and the field of view angle corresponding to the picture in the peripheral area is 5 degrees to 28 degrees.

[0019] In a second aspect, the present application provides a display terminal, comprising the above-mentioned display device.

[0020] In the display device of the embodiment of the present application, by arranging a first optical mirror on one side of the display panel and arranging a second optical mirror on one side of the reflection surface of the first optical mirror, the light emitted from the light emitting surface of the display panel is reflected by the first optical mirror to the second optical mirror, and finally forms a first virtual image after being reflected by the second optical mirror. Since the resolution of the central area of ​​the first virtual image is greater than the resolution of the peripheral area, when the human eye views the first virtual image, the middle area of ​​the retina is clearly imaged, and the edge area of ​​the retina is not clearly imaged, and the eye axis is not easy to grow in the direction of the unclear image, so it will not cause the eye axis to become longer, thereby improving the problem of decreased vision.

[0021] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] 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.

[0024] Figure 1 is a schematic structural diagram of a display device provided in an exemplary embodiment of the present disclosure;

[0025] Figure 2 yes Figure 1 Schematic diagram of the first virtual image in;

[0026] Figure 3 This is a diagram illustrating the principle of hyperopia defocus and myopia defocus;

[0027] Figure 4 is a curve of field curvature values ​​provided by an embodiment of the present application;

[0028] Figure 5 is a curve of an optical transfer function provided by an embodiment of the present application;

[0029] Figure 6 is a point diagram provided by an embodiment of the present application;

[0030] Figure 7 is a structural parameter of a display device provided in an embodiment of the present application;

[0031] Figure 8 is a surface parameter of a second optical mirror provided in an embodiment of the present application;

[0032] Fig. 9 It is a structural schematic diagram of a display terminal provided in an embodiment of the present application.

[0033] Description of reference numerals:

[0034] Display device 1;

[0035] Display panel 10;

[0036] A first optical mirror 20;

[0037] A second optical mirror 30, a concave surface 31, and a convex surface 32;

[0038] A first virtual image 40, a central region 41, and a peripheral region 42;

[0039] Retina 50;

[0040] Object plane 60;

[0041] First direction Y, second direction Z, third direction X;

[0042] A first spacing h1 and a second spacing h2;

[0043] Display terminal 2, terminal body 3. DETAILED DESCRIPTION

[0044] 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.

[0045] In a first aspect, the present application provides a display device 1, such as Figure 1 and Figure 2 As shown, the display device 1 includes a display panel 10, a first optical mirror 20 and a second optical mirror 30, the first optical mirror 20 is arranged at a distance on one side of the light emitting surface of the display panel 10, the reflective surface of the first optical mirror 20 faces the light emitting surface and the reflective surface is arranged at an angle with the light emitting surface, and the direction perpendicular to the light emitting surface is the first direction Y; the second optical mirror 30 and the first optical mirror 20 are arranged along the second direction Z, and the second optical mirror 30 is arranged on one side of the reflective surface of the first optical mirror 20, and the second direction Z is perpendicular to the first direction Y; wherein, the outgoing light of the display panel 10 forms a first virtual image 40 through the first optical mirror 20 and the second optical mirror 30, and the absolute value of the field curvature value increases in the direction from the central area 41 of the first virtual image 40 to the peripheral area 42 of the first virtual image 40.

[0046] The display panel 10 may be an LCD panel, an OLED panel, a Mini-LED panel, a Micro-LED panel, etc. The light emitting surface of the display panel 10 is a plane. The display image of the display panel 10 is an image with uniform clarity, that is, the clarity of the middle area and the edge area of ​​the display panel 10 is consistent.

[0047] For ease of description, the direction perpendicular to the light emitting surface of the display panel 10 is the first direction Y, the arrangement direction of the first optical mirror 20 to the second optical mirror 30 is the second direction Z, and the first direction Y is perpendicular to the second direction Z. The third direction X is perpendicular to both the first direction Y and the second direction Z.

[0048] like Figure 1 As shown, the light emitting surface of the display panel 10 is used to display images. Figure 1The dotted arrow in the figure is incident on the first optical mirror 20, at least part of the light is reflected by the first optical mirror 20 and then incident on the second optical mirror 30, the light reflected by the second optical mirror 30 is transmitted from the first optical mirror 20, enters the object plane 60, and the reverse extension line of the light entering the human eye forms a first virtual image 40.

[0049] When a user uses the display device 1, the human eye is located at Figure 1 The object plane 60 in the image is the exit pupil. The human eye can see the first virtual image 40 when looking in the direction of the first optical lens 20. The exit pupil is the origin of the optical measurement. Since the image viewed by the human eye is the first virtual image 40 formed after magnification, a hyperopia effect can be achieved. The display device 1 of the present application can be used for a desktop telescopic display (DTD).

[0050] In this application, the angle between the edge of the first virtual image 40 visible at the exit pupil and the line connecting the exit pupil is called the field of view (FOV). The field of view includes the horizontal field of view and the vertical field of view. The horizontal field of view is Figure 1 The angle B between the edge of the first virtual image 40 along the third direction X and the eye point is the horizontal viewing angle. The vertical viewing angle is Figure 1 The angle between the edge of the first virtual image 40 along the first direction Y and the line connecting the eye point.

[0051] Combination Figure 1 and Figure 2 , Figure 2 4 shows a front view of the first virtual image 40. The first virtual image 40 includes a central area 41 and a peripheral area 42, and the central area 41 is adjacent to the peripheral area 42. The shape of the central area 41 can be circular, elliptical, square, etc., which is not limited in the present application. Figure 2 The peripheral region 42 is a region of the first virtual image 40 excluding the central region 41 .

[0052] When the user uses the display device 1, the central area 41 is located in the center of the visual area of ​​the human eye, and the peripheral area is located in the edge visual area of ​​the human eye.

[0053] Combine the following Figure 3 The working principle of the display device 1 of the present application is described. Figure 3As shown, (a) is hyperopic defocus, and (b) is myopic defocus. As shown in (a), when light enters the human eye, it will form an image on the retina 50. Since the retina 50 is spherical, only the middle area E of the retina 50 can be clearly imaged, and the image positions of the edge areas of the retina 50 are F and G, that is, when the edge areas of the retina 50 are clearly imaged, the image is located behind the retina 50. Since the retina 50 tends to grow toward the position where the imaging point is clear, the retina 50 will grow toward F and G. When the retina 50 grows toward F and G, the retina 50 in the middle area will also grow toward the right side of E, which will cause the eye axis to lengthen. At this time, the image at the middle area E will be located in front of the retina 50, that is, the image in the middle area will also become unclear, resulting in myopia.

[0054] As shown in (b), when the imaging position of the edge area of ​​the retina 50 is F, G is located in front of the retina 50, myopia will not form.

[0055] In the present application, the clarity of the imaging of the central area 41 of the first virtual image 40 is set to be greater than the clarity of the peripheral area 42 of the first virtual image 40. When the human eye views the first virtual image 40, the clarity of the peripheral area 42 of the first virtual image 40 is smaller than the clarity of the central area 41, that is, the clarity of the peripheral area 42 is smaller than the clarity of the central area 41. Therefore, when the human eye observes, the edge area of ​​the retina 50 will not be located at the edge area when the imaging is clear. Figure 3 The F and G positions shown in (a) are located Figure 3 When the image of the peripheral area is clearly located in the area in front of the retina 50, it will not cause peripheral hyperopia defocusing, thus will not cause the eye axis to lengthen, thus avoiding myopia.

[0056] It should be noted that the central area 41 of the first virtual image 40 is a high definition area, and the peripheral area 42 of the first virtual image 40 is a sub-high definition area. Therefore, the pattern of the first virtual image 40 is still a clear pattern and does not affect the viewing of users.

[0057] like Figure 4 As shown, the absolute value of the field curvature value corresponding to the central area 41 is smaller than the absolute value of the field curvature value corresponding to the peripheral area 42 .

[0058] The field curvature refers to the situation that when the display screen of the light-emitting surface of the display panel 10 is imaged through the first optical lens 20 and the second optical lens 30, although each object point can form a clear image point in space, that is, the first virtual image 40, these image points are not coplanar, but form a curved surface, that is, the distance between the first virtual image 40 and the reference position is different. For the convenience of description, the distance between the first virtual image 40 and the reference position is called the virtual image distance. Among them, when the virtual image distance of the central area 41 of the first virtual image 40 is greater than the virtual image distance of the peripheral area 42 of the first virtual image 40, the field curvature is a negative value.

[0059] The generation of field curvature is closely related to the imaging characteristics of the first optical lens 20 and the second optical lens 30. Due to the influence of various factors such as the lens material, shape, refractive index and incident angle of the first optical lens 20 and the second optical lens 30, the focusing points of light at different positions are not the same. Specifically, compared with the central light, the edge light of the light-emitting surface of the display panel 10 will have a certain offset in the focusing position after passing through the first optical lens 20 and the second optical lens 30, resulting in a curved image surface of the entire first virtual image 40.

[0060] In the present application, the field curvature is a negative value, the field curvature value corresponding to the central area 41 and the field curvature value corresponding to the peripheral area 42 are both negative values, and the absolute value of the field curvature value corresponding to the central area 41 is smaller than the absolute value of the field curvature value corresponding to the peripheral area 42.

[0061] In at least one arbitrary direction on the plane perpendicular to the second direction Z, the absolute value of the field curvature value increases in the direction from the central area 41 to the peripheral area 42. For example, in the first direction Y, the absolute value of the field curvature value away from the central area 41 is greater than the absolute value of the field curvature value close to the central area 41. Alternatively, in the third direction X, the absolute value of the field curvature value away from the central area 41 is greater than the absolute value of the field curvature value close to the central area 41. Alternatively, in any other direction on the plane where the first direction Y and the third direction X are located, the absolute value of the field curvature value away from the central area 41 is greater than the absolute value of the field curvature value close to the central area 41. Through the above-mentioned settings, it can be achieved that in any direction, the clarity of the peripheral area 42 is less than the clarity of the central area 41, thereby improving the problem of peripheral hyperopic defocusing and decreased vision caused by human eyes when viewing the display device 1.

[0062] It should be noted that the test method of the field curvature value of the present application is carried out in accordance with the requirements of the technical standards in the "Technical Specifications for Desktop Telescopic Electronic Display Equipment" (T / ZSA209-2023).

[0063] Optionally, in at least one arbitrary direction on a plane perpendicular to the second direction Z, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.025. Through the above arrangement, the difference in virtual image distance between the central area 41 and the peripheral area 42 in any direction on the plane perpendicular to the second direction Z can be increased, so that the peripheral area 42 of the first virtual image 40 is closer to the exit pupil relative to the central area 41 of the first virtual image 40, so that when the first virtual image 40 of the peripheral area 42 is imaged on the retina 50, it will be located on the retina 50 or in front of the retina 50, thereby avoiding peripheral hyperopic defocus and improving the problem of decreased vision caused by peripheral hyperopic defocus when the human eye views the display device 1.

[0064] Optionally, in at least one arbitrary direction on a plane perpendicular to the second direction Z, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.1. Through the above arrangement, the difference in virtual image distance between the central area 41 and the peripheral area 42 in any direction on the plane perpendicular to the second direction Z can be further increased, thereby further avoiding peripheral hyperopic defocus, and improving the problem of decreased vision caused by peripheral hyperopic defocus when the human eye views the display device 1.

[0065] Optionally, in the first direction Y, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.025. Through the above arrangement, the difference in virtual image distance between the central area 41 and the peripheral area 42 in the first direction Y can be increased, so that the peripheral area 42 of the first virtual image 40 is closer to the exit pupil relative to the central area 41 of the first virtual image 40, so that when the first virtual image 40 of the peripheral area 42 is imaged on the retina 50, it will be located on the retina 50 or in front of the retina 50, thereby avoiding peripheral hyperopic defocus and improving the problem of decreased vision caused by peripheral hyperopic defocus when the human eye views the display device 1.

[0066] Optionally, in the first direction Y, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.1. Through the above arrangement, the clarity of the peripheral area 42 in the first direction Y can be further made smaller than the clarity of the central area 41, thereby further improving the problem of peripheral hyperopic defocusing and decreased vision caused by human eyes when viewing the display device 1.

[0067] Optionally, in the third direction X, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.025. Through the above arrangement, the clarity of the peripheral area 42 in the third direction X can be made smaller than the clarity of the central area 41, thereby improving the problem of peripheral hyperopic defocusing and decreased vision caused by human eyes when viewing the display device 1.

[0068] Optionally, in the third direction X, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.1. Through the above arrangement, the clarity of the peripheral area 42 in the third direction X can be further made smaller than the clarity of the central area 41, thereby improving the problem of peripheral hyperopic defocusing and decreased vision caused by human eyes when viewing the display device 1.

[0069] Optionally, in the third direction X, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.1; in the first direction Y, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 is greater than or equal to 0.025. Through the above settings, the clarity of the peripheral area 42 in the third direction X and the first direction Y can be made smaller than the clarity of the central area 41, thereby further improving the problem of peripheral hyperopic defocusing and decreased vision caused by human eyes when viewing the display device 1.

[0070] Optionally, in some embodiments, in at least two directions on a plane perpendicular to the second direction Z, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 can be greater than or equal to 0.025.

[0071] Optionally, in some embodiments, in at least two directions on a plane perpendicular to the second direction Z, the absolute value of the difference between the field curvature value at the center of the first virtual image 40 and the field curvature value at the boundary of the first virtual image 40 can be greater than or equal to 0.1.

[0072] In one embodiment, if Figure 4 As shown, Figure 4 (a) shows the curve of the field curvature value of the horizontal field of view, Figure 4 (b) in FIG. 1 shows a curve of the field curvature value in the vertical field of view. The horizontal field of view corresponds to the horizontal field of view angle direction, that is, the curve of the field curvature value in the third direction X. The vertical field of view corresponds to the vertical field of view angle direction, that is, the curve of the field curvature value in the first direction Y. Figure 4In the figure, the horizontal axis is the angles within the field of view, the angle corresponding to the bisector of the field of view is 0, the angle in the positive direction of the X-axis is positive, the angle in the negative direction of the X-axis is negative, and the field of view is twice the maximum angle in the positive direction of the X-axis. The vertical axis is the field curvature value. Figure 4 The black curve in the figure is an embodiment of the present application, and the grey curve is a comparative example.

[0073] For example, when Figure 1 When the viewing angle of the central area 41 of the image is 0 to 5 degrees, the corresponding Figure 4 The horizontal coordinate of (a) is -2.5 degrees to 2.5 degrees, corresponding to Figure 4 The horizontal coordinate of (b) is -2.5 degrees to 2.5 degrees. Figure 1 When the field of view corresponding to the image of the peripheral area 42 in the image is 5 degrees to 28 degrees, then the corresponding Figure 4 The horizontal coordinates of (a) are 2.5 to 14 degrees, -2.5 to -14 degrees; corresponding to Figure 4 The horizontal coordinates of (b) are 2.5 degrees to 14 degrees and -2.5 degrees to -14 degrees.

[0074] like Figure 4 As shown in (a), in the embodiment of the present application, as shown by the black curve, the field curvature value corresponding to the 0 degree angle is about -0.17, the field curvature value corresponding to the 7.73 degree angle is about -0.25, and the field curvature value corresponding to the 15.47 degree angle is about -0.37. The field curvature value corresponding to the -7.73 degree angle is about -0.25, and the field curvature value corresponding to the -15.47 degree angle is about -0.37.

[0075] like Figure 4 As shown in (a), in the comparative example, as shown by the gray curve, the field curvature value corresponding to the 0 degree angle is about -0.11, the field curvature value corresponding to the 7.73 degree angle is about -0.11, and the field curvature value corresponding to the 15.47 degree angle is about -0.21. The field curvature value corresponding to the -7.73 degree angle is about -0.11, and the field curvature value corresponding to the -15.47 degree angle is about -0.21.

[0076] like Figure 4 As shown in (b), in the embodiment of the present application, as shown by the black curve, the field curvature value corresponding to the 0 degree angle is about -0.17, the field curvature value corresponding to the 4.42 degree angle is about -0.19, and the field curvature value corresponding to the 8.85 degree angle is about -0.24. The field curvature value corresponding to the -4.42 degree angle is about -0.19, and the field curvature value corresponding to the -8.85 degree angle is about -0.24. Among them, the angle along the positive direction of the Y axis is a positive number, and the angle along the negative direction of the Y axis is a negative number.

[0077] like Figure 4As shown in (b), in the comparative example, as shown by the gray curve, the field curvature value corresponding to the 0 degree angle is about -0.11, the field curvature value corresponding to the 4.42 degree angle is about -0.11, and the field curvature value corresponding to the 8.85 degree angle is about -0.13. The field curvature value corresponding to the -4.42 degree angle is about -0.11, and the field curvature value corresponding to the -8.85 degree angle is about -0.11.

[0078] It can be seen that in the horizontal field of view and the vertical field of view, the absolute value of the difference between the field curvature value of the central area 41 and the field curvature value of the peripheral area 42 in the embodiment of the present application is larger, so that the peripheral area 42 of the first virtual image 40 is closer to the exit pupil relative to the central area 41 of the first virtual image 40, so that when the first virtual image 40 of the peripheral area 42 is imaged on the retina 50, it will be located on the retina 50 or in front of the retina 50, thereby avoiding peripheral hyperopic defocus.

[0079] Optionally, a value of the optical transfer function corresponding to the central area 41 is greater than or equal to a value of the optical transfer function corresponding to the peripheral area 42 .

[0080] Optical transfer function (MTF) is an indicator used to measure the resolution of an optical system, also known as the spatial frequency response function. The optical transfer function can be used to describe the minimum detail size that an optical system can transmit under a certain contrast.

[0081] like Figure 5 As shown, the horizontal axis represents the relative spatial frequency in cycles / mm, and the vertical axis represents the contrast, and the contrast ranges from 0 to 1. The black curve corresponds to the MTF function at 5 degrees, and the gray curve corresponds to the MTF function at 10 degrees. In an optical system, the higher the MTF value, the higher the resolution of the system, and the smaller details can be transmitted. When the horizontal axis is the same, the value of the MTF function at 5 degrees is greater than the value of the MTF function at 10 degrees, then the resolution at 5 degrees is higher than the resolution at 10 degrees, so that the central area 41 forms a high-definition image, and the peripheral area 42 forms a sub-high-definition image.

[0082] Alternatively, if Figure 5 As shown, the value of the optical transfer function decreases in the direction from the central area 41 to the peripheral area 42.

[0083] Optionally, a difference between a value of the optical transfer function corresponding to a field of view angle of 5 degrees and a value of the optical transfer function corresponding to a field of view angle of 10 degrees is a first difference, and the first difference is positively correlated with the relative spatial frequency.

[0084] like Figure 5As shown, the value of the optical transfer function corresponding to a viewing angle of 5 degrees decreases with the increase of the relative spatial frequency, and the value of the optical transfer function corresponding to a viewing angle of 10 degrees also decreases with the increase of the relative spatial frequency. When the relative spatial frequency increases, the first difference also increases.

[0085] Alternatively, if Figure 6 As shown, the size of the spot diagram of the central area 41 is larger than the size of the spot diagram of the peripheral area 42. Each column corresponds to a structure, and a structure is an embodiment. Figure 6 15 embodiments are shown, namely, structure 1 to structure 15. From top to bottom, the point diagrams corresponding to various angles from the central area 41 to the peripheral area 42 are shown. Figure 6 It can be seen that in each embodiment, the size of the spot diagram of the central area 41 is smaller than the size of the spot diagram of the peripheral area 42 .

[0086] Optionally, the first optical mirror 20 includes a plane beam splitter, the second optical mirror 30 includes a curved reflector, the second optical mirror 30 has a concave surface 31 and a convex surface 32 opposite to each other, and the concave surface 31 is located on a side of the convex surface 32 close to the first optical mirror 20 .

[0087] In some embodiments, the first optical mirror 20 is a beam splitter, which can be a plane mirror or a curved mirror. When the first optical mirror 20 is a plane beam splitter, the first optical mirror 20 does not affect the field curvature value, which can simplify the design of the optical system. The first optical mirror 20 can make a part of the light incident on the reflective surface of the first optical mirror 20 be reflected and the other part be transmitted. The ratio of the reflected and transmitted light can be set as needed. For example, 50% of the light can be reflected and 50% of the light can be transmitted, but it is not limited to this.

[0088] In this case, the first optical mirror 20 is taken as a plane beam splitter for illustration, but this should not be construed as a limitation to the present application.

[0089] The second optical mirror 30 is a curved reflector, and the side of the curved reflector facing the first optical mirror 20 is a concave surface 31, and the side surface opposite to the concave surface 31 is a convex surface 32. The curved reflector has a reflective effect and can reflect light incident on the concave surface 31. The higher the reflectivity of the second optical mirror 30, the more conducive it is to improving the brightness of the first virtual image 40.

[0090] Please combine Figure 1 , Figure 7 and Figure 8 , Figure 7 Shows Figure 1 Structural parameters of the display device 1 in, Figure 8 Shows Figure 1 Surface parameters of the second optical mirror 30 in .

[0091] In the first direction Y, the distance between the light emitting surface of the display panel 10 and the first optical mirror 20 is a first spacing h1. In the second direction Z, the distance between the center of the first optical mirror 20 and the concave surface 31 of the second optical mirror 30 is a second spacing h2. The second spacing h2 is greater than the first spacing h1.

[0092] The distance between the end of the first optical mirror 20 close to the second optical mirror 30 and the light emitting surface of the display panel 10 is greater than the distance between the end of the first optical mirror 20 far from the second optical mirror 30 and the light emitting surface of the display panel 10. The angle between the surface of one side of the first optical mirror 20 close to the display panel 10 and the first direction Y is an acute angle.

[0093] In one embodiment, the first optical mirror 20 is a plane beam splitter, and the second optical mirror 30 is a curved reflector, and the curvature of the curved reflector is -532.63. The first spacing h1 is 102.93 mm, and the second spacing h2 is 135.63 mm. The X-axis tilt of the first optical mirror 20 is angle C, and angle C is 36.78 degrees. The X-axis tilt of the second optical mirror 30 is angle D, and angle D is 5.632 degrees. The distance between the object plane 60 and the center of the first virtual image 40 is 6000 mm.

[0094] In one embodiment, the second optical mirror 30 is a free-form mirror. The surface shape of the second optical mirror 30 satisfies the formula:

[0095]

[0096] Wherein, k is the cone coefficient, c is the curvature, and r is the radius of the second optical mirror 30 . correspond Figure 8 Multiple extended polynomials in .

[0097] Alternatively, if Figure 1 As shown, the field of view angle corresponding to the picture in the central area 41 is 0 degrees to 5 degrees, and the field of view angle corresponding to the picture in the peripheral area 42 is 5 degrees to 28 degrees.

[0098] See also Figure 1 In the figure, A corresponds to the field of view of the central area 41, and A is 0 degrees to 5 degrees. In the figure, B corresponds to the field of view of the peripheral area 42, and B is 5 degrees to 28 degrees.

[0099] Second, as Fig. 9 As shown, the present application provides a display terminal, including the above-mentioned display device 1.

[0100] In this embodiment, if Fig. 9 As shown, the display terminal includes a display device 1 and a terminal body, and the display device 1 and the terminal body are combined into one.

[0101] In this embodiment, the display terminal may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or the like.

[0102] 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.

[0103] 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.

[0104] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0105] 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 panel; A first optical mirror is arranged at a distance on one side of the light emitting surface of the display panel, wherein a reflective surface of the first optical mirror faces the light emitting surface and the reflective surface is arranged at an angle to the light emitting surface, and a direction perpendicular to the light emitting surface is a first direction; A second optical mirror is arranged along a second direction with the first optical mirror, and the second optical mirror is disposed on one side of the reflection surface of the first optical mirror, and the second direction is perpendicular to the first direction; The outgoing light of the display panel forms a first virtual image through the first optical mirror and the second optical mirror, and the absolute value of the field curvature increases in a direction from the central area of ​​the first virtual image to the peripheral area of ​​the first virtual image.

2. The display device according to claim 1, characterized in that In a third direction, an absolute value of a difference between a field curvature value at a center of the first virtual image and a field curvature value at a boundary of the first virtual image is greater than or equal to 0.1, and the third direction is perpendicular to both the first direction and the second direction.

3. The display device according to claim 2, characterized in that: In the first direction, an absolute value of a difference between a field curvature value at a center of the first virtual image and a field curvature value at a boundary of the first virtual image is greater than or equal to 0.

025.

4. The display device according to claim 1, characterized in that A value of the optical transfer function corresponding to the central area is greater than or equal to a value of the optical transfer function corresponding to the peripheral area.

5. The display device according to claim 4, characterized in that: The value of the optical transfer function decreases in a direction from the central area to the peripheral area.

6. The display device according to claim 4, characterized in that: The difference between the value of the optical transfer function corresponding to the field angle of 5 degrees and the value of the optical transfer function corresponding to the field angle of 10 degrees is a first difference, and the first difference is positively correlated with the relative spatial frequency.

7. The display device according to claim 1, characterized in that: The size of the spot diagram of the central area is greater than the size of the spot diagram of the peripheral area.

8. The display device according to any one of claims 1 to 7, characterized in that: The first optical mirror comprises a plane beam splitter, the second optical mirror comprises a curved reflector, the second optical mirror comprises a concave surface and a convex surface opposite to each other, and the concave surface is located on a side of the convex surface close to the first optical mirror.

9. The display device according to any one of claims 1 to 7, characterized in that: The field of view angle corresponding to the picture in the central area is 0 degrees to 5 degrees, and the field of view angle corresponding to the picture in the peripheral area is 5 degrees to 28 degrees.

10. A display terminal, characterized in that: A display device comprising any one of claims 1 to 9.

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