Display device

Abstract

A display device. The display device comprises a display panel, a lens structure and a dimming structure. The lens structure is located on the light-emitting side of the display panel. The surface, close to the display panel, of the lens structure is a curved surface. The dimming structure is located between the display panel and the lens structure and comprises a plurality of microstructures arranged on the plane perpendicular to the optical axis of the lens structure, and the size, parallel to the optical axis, of each microstructure is the height of the microstructure. The lens structure at least comprises a first area and a second area, the second area is farther from the center of the lens structure than the first area, the first area comprises the center of the lens structure, and the height of the microstructure corresponding to the first area is smaller than that of the microstructure corresponding to the second area. According to the display device, by adjusting the height of the microstructure corresponding to the first area to be smaller than the height of the microstructure corresponding to the second area, matching of the principal ray angle of the display panel and the principal ray angle of the lens structure can be achieved, the display picture quality is improved, and the display brightness or chromaticity uniformity is improved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display device. Background Art

[0002] The chief ray is the ray that starts from an object point and passes through the image point after passing through the optical module. The chief ray angle (CRA) refers to the angle between the chief ray and the optical axis of the optical module. In a display device including an optical film group and a display screen, the display screen and the optical film group, such as an imaging lens, usually have different optical characteristics, such as the chief ray angle. If the chief ray angle of the display screen does not match the chief ray angle of the optical film group, problems may occur in the image displayed by the display device, such as blurred image, color difference, etc. Summary of the Invention

[0003] Embodiments of the present disclosure provide a display device. The display device includes: a display panel, a lens structure, and a dimming structure. The lens structure is located on the light-emitting side of the display panel, and the surface of the lens structure close to the display panel is a curved surface; the dimming structure is located between the display panel and the lens structure. The dimming structure includes a plurality of microstructures arranged in a plane perpendicular to the optical axis of the lens structure. The dimension of the microstructures parallel to the optical axis is their height. The lens structure includes at least a first region and a second region. The second region is farther from the center of the lens structure than the first region. The first region includes the center of the lens structure, and the height of the microstructures corresponding to the first region is less than the height of the microstructures corresponding to the second region.

[0004] For example, according to an embodiment of the present disclosure, the chief ray angle of the light emitted from the position of the display panel corresponding to the second region is CRA1, the chief ray angle of the lens structure is CRA2, and the difference between CRA1 and CRA2 is CRA0. Relative to the case where the microstructures are removed from the optical path from the display panel to the lens structure, the ratio of the value of the change in the chief ray angle of the light emitted from the position of the display panel corresponding to the second region after passing through the corresponding microstructures to CRA0 is 0.8 to 1.2.

[0005] For example, according to an embodiment of the present disclosure, the microstructures corresponding to the first region are configured to substantially not change the chief ray angle of the light emitted from the display panel after passing through the microstructures, and the microstructures corresponding to the second region are configured to make the chief ray angle of the light emitted from the display panel after passing through the microstructures smaller than in the case where the microstructures are removed from the optical path from the display panel to the lens structure.

[0006] For example, according to an embodiment of the present disclosure, the display panel includes a plurality of sub-pixels, and the included angle between the principal ray of the light emitted by the sub-pixels and the optical axis after passing through the microstructures is 0 to 75 degrees.

[0007] For example, according to an embodiment of the present disclosure, the shape of at least one microstructure is columnar.

[0008] For example, according to an embodiment of the present disclosure, the height is 10 nanometers to 2000 micrometers.

[0009] For example, according to an embodiment of the present disclosure, the maximum dimension of the microstructure in the direction perpendicular to the optical axis is 0.8 to 100 micrometers.

[0010] For example, according to an embodiment of the present disclosure, the ratio of the maximum dimensions of different microstructures in the direction perpendicular to the optical axis is 0.9 to 1.1.

[0011] For example, according to an embodiment of the present disclosure, the distance between adjacent microstructures is 0.8 to 100 micrometers.

[0012] For example, according to an embodiment of the present disclosure, the minimum distance between the curved surface of the lens structure and the display panel is 0.2 to 50 millimeters, and the minimum distance between the curved surface of the lens structure and the dimming structure is 0 to 10 millimeters.

[0013] For example, according to an embodiment of the present disclosure, the material of the microstructure includes glass, plastic, light-transmitting oxide material, or metal material.

[0014] For example, according to an embodiment of the present disclosure, the radius of curvature of the curved surface is -300 to 300 millimeters.

[0015] For example, according to an embodiment of the present disclosure, the center of the curved surface is closer to the display panel than the edge. In the direction from the center of the lens structure to the edge, the height of the microstructures corresponding to the second region among the plurality of microstructures gradually increases.

[0016] For example, according to an embodiment of the present disclosure, the second region includes a plurality of annular sub-regions, which are arranged in sequence in the direction from the center to the edge, and the heights of different microstructures corresponding to the same annular sub-region are the same.

[0017] For example, according to an embodiment of the present disclosure, in the direction from the center to the edge, the heights of the microstructures corresponding to different annular sub-regions gradually increase.

[0018] For example, according to an embodiment of the present disclosure, the curved surface includes a spherical surface, an aspherical surface, or a free-form surface. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0020] Figure 1 It is a schematic cross-sectional structure diagram of a part of a display device provided according to an embodiment of the present disclosure.

[0021] Figure 2 It is a curve showing the change of the principal ray angle with the distance between different structures and the optical axis of the lens structure.

[0022] Figure 3 It is a schematic diagram of the principal ray angles of the display panel and the lens structure.

[0023] Figure 4 It is a schematic plan view of the lens structure.

[0024] Figure 5 It is a schematic plan view of the dimming structure.

[0025] Figure 6 For Figure 5 It is a schematic cross-sectional structure diagram taken along the AA' line shown.

[0026] Figure 7 It is a schematic diagram of the principal ray after the display panel is matched with the dimming structure. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items.

[0029] In the embodiments of the present disclosure, features such as "parallel", "perpendicular", and "identical" include the strictly defined features of "parallel", "perpendicular", "identical", etc., as well as cases with certain errors such as "substantially parallel", "substantially perpendicular", and "substantially identical". Considering measurement and errors associated with the measurement of specific quantities (e.g., limitations of the measurement system), it means within the acceptable deviation range for a specific value determined by those of ordinary skill in the art. For example, "substantially" can mean within one or more standard deviations, or within 10% or 5% of the value. When the quantity of a component is not specifically indicated in the following text of the embodiments of the present disclosure, it means that the component can be one or more, or can be understood as at least one. "At least one" means one or more, and "a plurality" means at least two.

[0030] In the research, the inventors of the present application found that: to solve the CRA matching problem between the optical module and the display screen, a micro-lens array (Micro-Lens Array, abbreviated as MLA) can be introduced between the two. However, there are many imperfections in the design and arrangement of the MLA. For example, when the entrance pupil positions are different, even with the MLA technology, it may not be possible to fully match the different CRA values at different positions of the optical module, which may lead to situations such as inconsistent brightness and chromaticity between the image edge and the image center when the user views the screen, thereby causing adverse reactions such as visual fatigue, dizziness, or discomfort to the user. For example, display screens of different displays have different parameters such as pixel arrangements, so the position of the MLA needs to be adjusted accordingly according to the parameters of the pixels in the display screen to achieve the best CRA compensation effect. For example, the CRA matching between the MLA and the display screen may result in inconsistent picture colors and brightness and darkness, which may cause color deviation or distortion in the displayed image, affecting the user's viewing experience. For example, due to CRA differences, different CRAs may display inconsistent colors on the same display screen, resulting in a reduction in the contrast of the displayed image and affecting the overall appearance consistency of the screen. For example, since the MLA cannot be fully matched with the CRA of the display screen, it may limit the size and other models of the display screen. For example, certain models of display screens may be incompatible with specific MLAs, which may lead to limitations in selection.

[0031] An embodiment of the present disclosure provides a display device. The display device includes a display panel, a lens structure, and a dimming structure. The lens structure is located on the light-emitting side of the display panel, and the surface of the lens structure close to the display panel is a curved surface; the dimming structure is located between the display panel and the lens structure, and the dimming structure includes a plurality of microstructures arranged in a plane perpendicular to the optical axis of the lens structure, and the dimension of the microstructure parallel to the optical axis is its height. The lens structure includes at least a first region and a second region, the second region is farther from the center of the lens structure than the first region, the first region includes the center of the lens structure, and the height of the microstructure corresponding to the first region is less than the height of the microstructure corresponding to the second region.

[0032] The display device provided by the present disclosure can achieve the matching of the principal ray angle of the display panel and the principal ray angle of the lens structure by providing a light modulation structure including a plurality of microstructures between the lens structure and the display panel, and adjusting the height of the microstructures corresponding to the first region to be less than the height of the microstructures corresponding to the second region, thereby increasing the degree of freedom in optical imaging design, improving the display image quality, improving the uniformity of display brightness or chromaticity, reducing stray light, and enhancing the contrast ratio.

[0033] The display device provided by the present disclosure will be described below with reference to the accompanying drawings.

[0034] Figure 1 FIG. is a schematic partial cross-sectional structure diagram of a display device according to an embodiment of the present disclosure. As Figure 1 shown, the display device includes a display panel 10, a lens structure 20, and a light modulation structure 30. The lens structure 20 is located on the light-emitting side of the display panel 10, and the surface of the lens structure 20 close to the display panel 10 is a curved surface 201; the light modulation structure 30 is located between the display panel 10 and the lens structure 20. For example, the light emitted from the display panel 10 is incident on the entrance pupil after passing through the light modulation structure 30 and the lens structure 20. For example, the above-mentioned curved surface 201 of the lens structure 20 may be the surface on the light-incident side of the lens structure 20. For example, the light modulation structure 30 is configured to adjust the propagation direction and phase of the light emitted from the display panel 10 and incident on the lens structure 20.

[0035] As Figure 1 shown, the light modulation structure 30 includes a plurality of microstructures 310 arranged in a plane perpendicular to the optical axis of the lens structure 20. The dimension of the microstructure 310 parallel to the optical axis OA is its height. The lens structure 20 includes at least a first region 210 and a second region 220. The second region 220 is farther from the center of the lens structure 20 than the first region 210. The first region 210 includes the center of the lens structure 20. The height of the microstructures 310 corresponding to the first region 210 is less than the height of the microstructures 310 corresponding to the second region 220.

[0036] The display device provided by the present disclosure can achieve the matching of the principal ray angle of the display panel 10 and the principal ray angle of the lens structure 20 by providing a light modulation structure 30 including a plurality of microstructures 310 between the lens structure 20 and the display panel 10, and adjusting the height of the microstructures 310 corresponding to the first region 210 to be less than the height of the microstructures 310 corresponding to the second region 220, thereby increasing the degree of freedom in optical imaging design, improving the display image quality, improving the uniformity of display brightness or chromaticity, reducing stray light, and enhancing the contrast ratio.

[0037] The microstructure 310 corresponding to the first region 210 means that the orthographic projection of the microstructure 310 on the lens structure 20 falls within the first region 210, and the microstructure 310 corresponding to the second region 220 means that the orthographic projection of the microstructure 310 on the lens structure 20 falls within the second region 220. The center of the lens structure 20 described above may refer to the geometric center of the lens structure 20, or may refer to the geometric center of the curved surface 201 of the lens structure 20 on the side close to the display panel 10.

[0038] For example, as Figure 1 shown, the optical axis of the lens structure 20 is parallel to the Z direction. For example, the dimension of the microstructure 310 in the Z direction is its height. For example, the microstructures 310 are arranged in a plane perpendicular to Z. For example, the first region 210 of the lens structure 20 is the central region of the lens structure 20, such as a region including the center of the lens structure 20 and having a radius in a smaller dimension. For example, the second region 220 of the lens structure 20 may be a region surrounding the first region 210. For example, the lens structure 20 only includes the first region 210 and the second region 220, and the dimension of the second region 220 in the direction perpendicular to the optical axis, such as the Y direction, is greater than the dimension of the first region 210 in the Y direction.

[0039] For example, as Figure 1 shown, the dimensions of the display panel 10 and the dimming structure 30 in the direction perpendicular to the optical axis of the lens structure 20 may be the same, but are not limited thereto. The dimension of the display panel 10 in the direction perpendicular to the optical axis of the lens structure 20 may be smaller than the dimension of the dimming structure 30.

[0040] For example, as Figure 1 shown, the light rays emitted from the central region of the display panel 10 enter the first region 210 of the lens structure 20 after passing through the central region of the dimming structure 30, and the light rays emitted from at least some regions outside the central region of the display panel 10 enter the second region 220 of the lens structure 20 after passing through at least some regions outside the central region of the dimming structure 30. For example, the straight line where the optical axis of the lens structure 20 is located passes through the central region of the display panel 10 and the central region of the dimming structure 30. For example, the height of the microstructures 310 in the central region of the dimming structure 30 is less than the height of the microstructures 310 in at least some regions outside the central region.

[0041] In some examples, as Figure 1 shown, the microstructure 310 corresponding to the first region 210 is configured to substantially not change the principal ray angle of the light rays emitted from the display panel 10 after passing through the microstructure 310, and the microstructure 310 corresponding to the second region 220 is configured such that, compared with the case where the microstructures 310 are removed from the optical path from the display panel 10 to the lens structure 20, the principal ray angle of the light rays emitted from the display panel 10 after passing through the microstructure 310 becomes smaller, such as the included angle between the principal ray angle and the principal ray angle of the lens structure becomes smaller.

[0042] For example, the principal ray angle of the light emitted from the central region of the display panel 10 after passing through the microstructure 310 in the central region of the light-dimming structure 30 is the first principal ray angle, and the principal ray angle of the light emitted from the central region of the display panel 10 is the second principal ray angle. The difference between the first principal ray angle and the second principal ray angle is less than 5 degrees, which is substantially the same. The principal ray angle of the light emitted from a region outside the central region of the display panel 10 is the third principal ray angle, and the principal ray angle of the light emitted from a region outside the central region of the display panel 10 after passing through the microstructure 310 in the region outside the central region of the light-dimming structure 30 is the fourth principal ray angle, and the fourth principal ray angle is less than the third principal ray angle. For example, the difference between the fourth principal ray angle and the principal ray angle of the second region of the lens structure is less than the difference between the third principal ray angle and the principal ray angle of the second region of the lens structure.

[0043] For the display device provided by the present disclosure, by adjusting the principal ray of the light emitted from the display panel 10 to deflect towards the principal ray of the lens structure 20 after passing through the microstructure 310 in the region outside the central region of the light-dimming structure 30, it is beneficial to reduce the difference between the principal ray angle of the display panel 10 and the principal ray angle of the lens structure 20, improve the quality of the display screen, and prevent problems such as blurring or color difference in the display screen.

[0044] Figure 2 It is a curve of the principal ray angle varying with the distance between different structures and the optical axis of the lens structure.

[0045] For example, as Figure 1 and Figure 2 shown, when the microstructure 310 is removed from the optical path from the display panel 10 to the lens structure 20, the principal ray angle of the light emitted from the display panel 10 is CRA10, and the principal ray angle of the lens structure 20 is CRA20. The ratio of the principal ray angle of the light emitted from the central region of the display panel 10, such as the position corresponding to the first region 210 of the lens structure 20, to the principal ray angle of the first region 210 of the lens structure 20 is 0.9 to 1.1. For example, the two principal ray angles are relatively close and in a matching state.

[0046] In some examples, as Figure 1 and Figure 2 shown, when the microstructure 310 is removed from the optical path from the display panel 10 to the lens structure 20, the principal ray angle of the light emitted from the position corresponding to the second region 220 of the display panel 10 is CRA1, and the principal ray angle of the lens structure 20 is CRA2. For example, the principal ray angle at the position of the second region 220 of the lens structure 20 is CRA2, and the difference between CRA1 and CRA2 is CRA0.

[0047] The position of the above display panel 10 corresponding to the second region 220 may mean that the orthographic projection of this position on the lens structure 20 in the display panel 10 is located within the second region 220. The principal ray angle of the lens structure 20 refers to the angle between the principal ray at the maximum image height and the optical axis.

[0048] For example, as Figure 2 shown, the difference between the principal ray angle of the light emitted from the area outside the central area of the display panel 10 and the principal ray angle of the second region 220 of the lens structure 20 is significantly greater than the difference between the principal ray angle of the light emitted from the central area of the display panel 10 and the principal ray angle of the first region 210 of the lens structure 20. As the distance between the position of the light emitted from the display panel 10 and the optical axis of the lens structure 20 increases, the CRA0 increases, and the matching degree between the CRA10 of the display panel 10 and the CRA20 of the lens structure 20 becomes lower and lower, which easily leads to problems such as color deviation or distortion in the image displayed by the display device and a decrease in contrast, affecting the user's viewing experience.

[0049] For example, as Figure 2 shown, after the display panel 10 is matched with the microstructure 310 in the dimming structure 30, the principal ray angle of the light emitted from the display panel 10 after passing through the microstructure 310 is CRA30. For the central area of the display panel 10, such as the position corresponding to the first region 210 of the lens structure 20, the ratio of the principal ray angle of the light emitted after passing through the microstructure 310 to the principal ray angle of the first region 210 of the lens structure 20 is 0.9 to 1.1. If the two principal ray angles differ slightly, they are in a matching state. For example, for the area outside the central area of the display panel 10, such as the position corresponding to the second region 220 of the lens structure 20, the ratio of the principal ray angle of the light emitted after passing through the microstructure 310 to the principal ray angle of the second region 220 of the lens structure 20 is 0.8 to 1.2. For example, the ratio can be 0.9 to 1.1 and is in a matching state.

[0050] For example, as Figure 2 shown, for the area outside the central area of the display panel 10, such as the position corresponding to the second region 220 of the lens structure 20, the principal ray angle of the light emitted after passing through the microstructure 310 is CRA3, and CRA3 is less than CRA1. For example, the difference between CRA3 and CRA2 is less than CRA0.

[0051] In the display device provided by the present disclosure, by adjusting the microstructure 310 corresponding to the second region 220 of the lens structure 20, the difference between the principal ray angle of the light emitted from the display panel 10 after passing through the dimming structure 30 and the principal ray angle of the lens structure 20 itself is small, improving the matching degree between the principal ray angle of the display panel 10 combined with the microstructure 310 and the principal ray angle of the lens structure 20, which is beneficial to improving the quality of the display screen and preventing problems such as blurring or color difference in the display screen.

[0052] In some examples, such as Figure 1 and Figure 2 shown, relative to the case where the microstructure 310 is removed from the optical path from the display panel 10 to the lens structure 20, the principal ray angle of the light emitted from the display panel 10 becomes smaller after passing through the microstructure 310. For example, the reduced angle is CRA01, and the ratio of CRA01 to CRA0 is 0.8 to 1.2. For example, the ratio of CRA01 to CRA0 is 0.9 to 1.1. For example, the ratio of CRA01 to CRA0 is 0.95 to 1.05. For example, the ratio of CRA01 to CRA0 is 0.98 to 1.02. For example, CRA01 is equal to CRA0. The smaller the difference between CRA01 and CRA0, the higher the matching degree between the principal ray angle of the display panel 10 combined with the microstructure 310 and the principal ray angle of the lens structure 20, and the higher the quality of the display screen of the display device.

[0053] Figure 3 Schematic diagram of the principal ray angles of the display panel and the lens structure. Figure 3 The lens structure 20 is simplified to a curved surface 201. Figure 3 In the shown display panel 10, no microstructure 310 is provided between the display panel 10 and the lens structure 20.

[0054] For example, as Figure 3 shown, the angle between the principal ray emitted from the position of the display panel 10 corresponding to the second region 220 of the lens structure 20 and the straight line perpendicular to the display surface of the display panel 10 is the principal ray angle CRA1, and CRA1 satisfies the relational expression (1):

[0055] CRA1 = tan -1 [(y screen -y source ) / Z].

[0056] In the above relational expression (1), y screen represents the ordinate in the Y direction of the incident point of the principal ray emitted from the display panel 10 on the lens structure 20, y source represents the ordinate in the Y direction of the sub-pixel 100 of the light emitted from the display panel 10, and Z represents the distance between the incident point of the principal ray in the light emitted from the display panel 10 on the curved surface 201 of the lens structure 20 and the display surface of the display panel 10.

[0057] For example, as Figure 3 shown, the principal ray angle CRA2 of the lens structure 20 satisfies the relational expression (2):

[0058] CRA2 = tan -1 [(y screen -y lens) / Z].

[0059] The y in the above relationship (1) lens represents the ordinate in the Y direction of the intersection point of the chief ray of the lens structure 20 and the plane where the display surface of the display panel 10 is located.

[0060] For example, as Figure 1 and Figure 3 shown, after a dimming structure 30 including microstructures 310 is provided between the display panel 10 and the lens structure 20, the chief ray emitted from the position of the second region 220 of the display panel 10 corresponding to the lens structure 20 is deflected after passing through the refraction of the microstructures 310, and the deflection angle is close to the difference between CRA2 and CRA1, that is, CRA0. For example, the regulation of light by the microstructures 310 of the dimming structure 30 includes geometric phase regulation, such as realizing phase mutation of light waves by adjusting the heights of microstructures in different regions, so as to realize phase gradient control.

[0061] In some examples, as Figure 1 shown, the shape of at least one microstructure 310 is columnar, and the height of the columnar shape is the height. For example, the shapes of the microstructures 310 are all columnar. For example, the orthographic projection of the microstructure 310 on the plane perpendicular to the Z direction can be circular, rectangular or other regular shapes, or irregular shapes. For example, the dimension of the microstructure 310 in the direction perpendicular to the optical axis of the lens structure 20 is the width or length of the microstructure 310, and the lengths at each position of the same microstructure 310 are the same, or the widths at each position of the same microstructure 310 are the same. However, the embodiments of the present disclosure are not limited thereto. For example, the shape of at least one microstructure 310 can be frustum-shaped, and the dimension of the frustum-shaped near the display panel 10 is larger than the dimension far from the display panel 10.

[0062] In some examples, as Figure 1As shown, the height of the microstructure 310 ranges from 10 nanometers to 2000 micrometers. For example, the height of the microstructure 310 can be from 15 nanometers to 100 nanometers. For example, the height of the microstructure 310 can be from 20 nanometers to 300 nanometers. For example, the height of the microstructure 310 can be from 25 nanometers to 50 nanometers. For example, the height of the microstructure 310 can be from 30 nanometers to 500 nanometers. For example, the height of the microstructure 310 can be from 35 nanometers to 800 nanometers. For example, the height of the microstructure 310 can be from 40 nanometers to 200 nanometers. For example, the height of the microstructure 310 can be from 45 nanometers to 1000 nanometers. For example, the height of the microstructure 310 can be from 55 nanometers to 150 nanometers. For example, the height of the microstructure 310 can be from 60 nanometers to 60 micrometers. For example, the height of the microstructure 310 can be from 70 nanometers to 100 micrometers. For example, the height of the microstructure 310 can be from 300 nanometers to 300 micrometers. For example, the height of the microstructure 310 can be from 600 nanometers to 500 micrometers. For example, the height of the microstructure 310 can be from 20 micrometers to 1000 micrometers. For example, the height of the microstructure 310 can be from 5 micrometers to 1500 micrometers.

[0063] In some examples, as Figure 1 shown, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 0.8 to 100 micrometers. For example, the shape of the orthographic projection of the microstructure 310 on the plane perpendicular to the optical axis can be a square, and the range of both the diagonal and the side length of the square can be 0.8 to 100 micrometers. For example, the side length of the square can be 1 micrometer. For example, the shape of the orthographic projection of the microstructure 310 on the plane perpendicular to the optical axis can be a circle, and the range of the diameter of the circle can be 0.8 to 100 micrometers.

[0064] For example, as Figure 1 shown, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 1 to 90 micrometers. For example, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 2 to 50 micrometers. For example, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 5 to 80 micrometers. For example, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 10 to 40 micrometers. For example, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 30 to 70 micrometers. For example, the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis is 20 to 60 micrometers.

[0065] In some examples, as Figure 1 shown, the ratio of the maximum dimensions of different microstructures 310 in the direction perpendicular to the optical axis is 0.9 to 1.1. For example, the maximum dimensions of different microstructures 310 in the direction perpendicular to the optical axis are equal.

[0066] In some examples, as Figure 1As shown, the distance between adjacent microstructures 310 is 0.8 to 100 micrometers.

[0067] The distance between the adjacent microstructures 310 may refer to the distance between the edges of the adjacent microstructures 310 that are close to each other.

[0068] For example, the ratio of the distance between adjacent microstructures 310 to the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis may be 0.9 to 1.1. For example, the distance between adjacent microstructures 310 may be the same as the maximum dimension of the microstructure 310 in the direction perpendicular to the optical axis. For example, the shape of the microstructure 310 in the plane perpendicular to the optical axis is a square with a side length of 1 micrometer, and a plurality of microstructures 310 are arranged in an array along the extending directions of two perpendicular sides of the square, and the distance between two adjacent microstructures 310 arranged in the extending directions of the two perpendicular sides of the square is 1 micrometer.

[0069] In some examples, as Figure 1 shown, the minimum distance between the curved surface 201 of the lens structure 20 and the display panel 10 is 0.2 to 50 millimeters, and the minimum distance between the lens structure 20 and the dimming structure 30 is 0 to 10 millimeters. For example, the distance between the curved surface 201 of the lens structure 20 and the display panel 10 is 1 to 40 millimeters, and the distance between the lens structure 20 and the dimming structure 30 is 1 to 9 millimeters. For example, the distance between the curved surface 201 of the lens structure 20 and the display panel 10 is 10 to 30 millimeters, and the distance between the lens structure 20 and the dimming structure 30 is 2 to 6 millimeters. For example, the distance between the curved surface 201 of the lens structure 20 and the display panel 10 is 15 to 20 millimeters, and the distance between the lens structure 20 and the dimming structure 30 is 3 to 7 millimeters. For example, the distance between the curved surface 201 of the lens structure 20 and the display panel 10 is 25 to 45 millimeters, and the distance between the lens structure 20 and the dimming structure 30 is 5 to 8 millimeters.

[0070] In some examples, as Figure 1As shown, the radius of curvature of the curved surface 201 of the lens structure 20 is -300 to 300 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -280 to -1 millimeter. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -250 to -100 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -240 to -20 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -200 to -50 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -220 to -80 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -180 to -10 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -170 to -45 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -120 to -15 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -100 to -30 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -150 to -60 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is -90 to -40 millimeters. For example, the center of the curved surface 201 of the lens structure 20 is farther from the display panel 10 than the edge. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 10 to 200 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 20 to 100 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 50 to 150 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 80 to 250 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 45 to 220 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 60 to 270 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 120 to 180 millimeters. For example, the radius of curvature of the curved surface 201 of the lens structure 20 is 140 to 240 millimeters.

[0071] By setting the height of the microstructures 310, the distance between adjacent microstructures 310, the distance between the microstructures 310 and the lens structure 20 to match the radius of curvature of the lens structure 20 and the distance between the curved surface 201 of the lens structure 20 and the display panel 10, the display panel 10 provided by the present disclosure can make the matching degree of the principal ray angle of the display panel 10 combined with the microstructures 310 and the principal ray angle of the lens structure 20 relatively high, improving the quality of the display screen of the display device.

[0072] In some examples, as Figure 1 shown, the curved surface 201 of the lens structure 20 includes a spherical surface, an aspherical surface or a free-form surface 201.

[0073] In some examples, as Figure 1As shown, the display panel 10 includes a plurality of sub-pixels 100, and the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 0 to 75 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 5 to 70 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 2 to 30 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 1 to 20 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 10 to 45 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 15 to 60 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 12 to 40 degrees. For example, the angle between the principal ray of the light emitted by the sub-pixel 100 after passing through the microstructure 310 and the optical axis is 35 to 50 degrees.

[0074] By providing the microstructure 310 between the display panel 10 and the lens structure 20 to adjust the angle between the principal ray passing through the microstructure 310 and the optical axis of the lens structure 20, it is beneficial to improve the matching degree between the principal ray angle of the display panel 10 and the principal ray angle of the lens structure 20.

[0075] For example, a color filter layer (not shown) is further provided on the light-emitting side of the sub-pixel 100. For example, the color filter layer may include a red color filter, a green color filter, and a blue color filter. For example, a black light-shielding structure may be provided between different color color filters. For example, each sub-pixel 100 may be a sub-pixel 100 that emits white light. The white light emits red light after passing through the red color filter, emits green light after passing through the green color filter, and emits blue light after passing through the blue color filter. For example, the plurality of sub-pixels 100 may include a blue sub-pixel that emits blue light, a green sub-pixel that emits green light, and a red sub-pixel that emits red light. A blue color filter is provided on the light-emitting side of the blue sub-pixel, a green color filter is provided on the light-emitting side of the green sub-pixel, and a red color filter is provided on the light-emitting side of the red sub-pixel. By providing the color filter layer, crosstalk between the light emitted by different color sub-pixels 100 can be reduced.

[0076] In some examples, such as Figure 1As shown, the center of the curved surface 201 of the lens structure 20 is closer to the display panel 10 than the edge. In the direction from the center of the lens structure 20 towards the edge, such as the direction perpendicular to the optical axis and from the optical axis towards the edge of the lens structure 20, the height of the microstructures 310 corresponding to the second region 220 among the multiple microstructures 310 gradually increases, such as having a gradually increasing trend. The above "gradually increasing trend" may mean that in the above direction, the heights of any two adjacent microstructures 310 are different, or the second region 220 includes multiple sub-regions, and in the above direction, the heights of the microstructures 310 in any two adjacent sub-regions are different, and the heights of different microstructures 310 in the same sub-region are the same.

[0077] In the dimming structure 30 provided by the present disclosure, by setting the heights of the microstructures 310 corresponding to different regions of the lens structure 20, while changing the propagation direction of light rays, improving the clarity of the image displayed by the display device and the vividness of colors, the viewing angle range can also be enhanced.

[0078] Figure 4 It is a schematic plan view of the lens structure. Figure 5 It is a schematic plan view of the dimming structure. Figure 6 Along Figure 5 The cross-sectional structure schematic diagram taken along the AA' line shown. Figure 7 It is a schematic diagram of the principal ray after the display panel is matched with the dimming structure. Figure 4 Schematically shows that the shape of the plane of the lens structure 20 is circular, but it is not limited thereto, and it can also be a polygon such as an ellipse or a quadrilateral. Figure 5 Schematically shows that the shape of the plane of the dimming structure 30 is rectangular, but it is not limited thereto, and it can also be a shape such as a circle, an ellipse, or other polygons except rectangles.

[0079] In some examples, such as Figure 1 , Figures 4 to 7 As shown, the second region 220 of the lens structure 20 includes multiple annular sub-regions 221, and the multiple annular sub-regions 221 are arranged in sequence in the direction from the center to the edge, and the heights of different microstructures 310 corresponding to the same annular sub-region 221 are the same. For example, the multiple annular sub-regions 221 can be concentric annular regions. For example, the multiple annular sub-regions 221 surround the first region 210. For example, the edges of adjacent annular sub-regions 221 are joined, and the edge of the annular sub-region 221 closest to the first region 210 is joined to the edge of the first region 210. Figure 4 Schematically shows that the number of annular sub-regions 221 included in the second region 220 is two, but it is not limited thereto, and it can be set according to product requirements, such as one, three, or more.

[0080] For example, such as Figures 4 to 7As shown, the lens structure 20 includes a first region 210, and the second region 220 of the lens structure 20 includes two annular sub-regions 221. Then, the dimming structure 30 includes a central dimming region 301 and two annular dimming regions 302 corresponding to the two annular sub-regions 221. The microstructure 310 included in the central dimming region 301 is the first microstructure 311, and the microstructures 310 included in the two annular dimming regions 302 are the second microstructure 312 and the third microstructure 313 respectively. The height of the first microstructure 311 is less than the height of the second microstructure 312, and the height of the second microstructure 312 is less than the height of the third microstructure 313.

[0081] In some examples, as Figure 1 、 Figures 4 to 7 shown, in the direction from the center to the edge of the lens structure 20, the height of the microstructure 310 corresponding to different annular sub-regions 221 gradually increases. For example, in the direction from the center to the edge of the dimming structure 30, the height of the microstructure 310 in different annular dimming regions 302 gradually increases.

[0082] For example, as Figure 1 and Figure 5 shown, the multiple microstructures 310 in the dimming structure 30 are arranged in an array along the X direction and the Y direction, and the microstructures 310 located in the central dimming region 301 are arranged at equal intervals, and the microstructures 310 located in the annular dimming region 302 are arranged at equal intervals. The ratio of the distance between adjacent first microstructures 311 to the distance between adjacent second microstructures 312 is 0.9 to 1.1, such as 1. The ratio of the distance between adjacent second microstructures 312 to the distance between adjacent third microstructures 313 is 0.9 to 1.1, such as 1. For example, the density of the microstructures 310 in the central dimming region 301 is equal to the density of the microstructures 310 in the annular dimming region 302. Of course, the embodiments of the present disclosure are not limited thereto. According to the requirements of the display device, the distribution density of the microstructures 310 in the central dimming region can be set to be different from the distribution density of the microstructures 310 in the annular dimming region. For example, the distribution density of the microstructures 310 in the central dimming region can be less than the distribution density of the microstructures 310 in the annular dimming region, or the distribution density of the microstructures 310 in the central dimming region can be greater than the distribution density of the microstructures 310 in the annular dimming region.

[0083] For example, as Figure 4 and Figure 5 shown, the curved surface 201 of the lens structure 20 can be a spherical surface, and the microstructures 310 in the dimming structure 30 can be symmetrically distributed with respect to the optical axis of the lens structure 20. For example, the microstructures 310 can be symmetrically distributed with respect to the center line extending in the Y direction, or can be symmetrically distributed with respect to the center line extending in the X direction.

[0084] In some examples, as Figure 6As shown, the material of the microstructure 310 includes glass, plastic, a light-transmitting oxide material, or a metal material.

[0085] For example, as Figure 6 shown, the light-adjusting structure 30 includes a substrate 320 and a plurality of microstructures 310 located on the substrate 320. The substrate 320 is located between the microstructures 310 and the display panel 10. Both the two side surfaces of the substrate 320 close to and away from the display panel 10 can be flat surfaces. For example, the light-adjusting structure 30 can be a metalens, such as a planar lens that uses a metasurface to focus light. While achieving a thin and light design, the flatness of the surface of the light-adjusting structure 30 helps to avoid the problem of image distortion and deformation that is easily caused by the surface of the curved surface 201. The microstructures 310 of the metalens structure 20 can achieve precise matching and optimization of the main light angles for each sub-pixel 100 in the display panel 10 by adjusting the heights of the microstructures 310 at different positions.

[0086] For example, a metalens is a thin and flat structure with a plurality of microstructures 310 arranged in a specific pattern. The microstructures 310 can be fabricated by electron beam lithography technology to meet the shape and size requirements of the microstructures 310. For example, a layer of photosensitive resin can be coated on the substrate 320, such as glass or plastic, and then the pattern of the microstructures 310 can be etched on the resin layer using an electron beam, and then the microstructures 310 can be formed on the substrate 320 through a development and etching process. Since the metalens is a flat structure and its thickness is extremely thin, it is not easy to generate chromatic aberration. For example, it can make light of all wavelengths pass through almost simultaneously. Compared with glass or other traditional materials with fixed dispersion, the advantages of the metalens also include adjustable dispersion (the ability to control how light color is dispersed).

[0087] For example, as Figure 1 shown, the lens structure 20 can include at least one lens, Figure 1 schematically showing that the lens structure 20 includes two lenses, but not limited thereto. The lens structure 20 can include a single lens, three lenses, or more lenses. The embodiments of the present disclosure do not limit this.

[0088] For example, as Figure 1As shown, the lens structure 20 can be a structure in a catadioptric optical path (Pancake). For example, when the lens structure 20 is a single lens, antireflection and polarization films are respectively provided on two surfaces of the lens. The antireflection film is located on the side of the lens close to the display panel 10, and the reflective polarization film is located on the side of the lens far from the display panel 10. A phase retardation film is provided between the antireflection film and the reflective polarization film, and a linear polarization film is provided on the side of the reflective polarization film far from the display panel 10. The principle of the folded optical path is as follows: A wave plate can be provided on the light-emitting side of the display panel 10. The image light emitted from the display panel 10 is converted into right-handed circularly polarized light after passing through the wave plate, and the polarization state of the right-handed circularly polarized light remains unchanged after passing through the antireflection film by transmission. The right-handed circularly polarized light reaches the phase retardation film, and the right-handed circularly polarized light incident on the phase retardation film is converted into p-linearly polarized light. The p-linearly polarized light is reflected back to the phase retardation film by the reflective polarization layer, and the first reflection occurs here. Then, the p-linearly polarized light is converted into right-handed circularly polarized light after passing through the phase retardation film. The right-handed circularly polarized light reaches the antireflection film and is reflected at the antireflection film, and the second reflection occurs here. Due to the half-wave loss, the reflected light changes from right-handed circularly polarized light to left-handed circularly polarized light. The left-handed circularly polarized light is converted into s-linearly polarized light after passing through the phase retardation film, and then the s-linearly polarized light is transmitted through the reflective polarization layer and the linear polarization film and shoots towards the human eye.

[0089] For example, the display device can be a virtual reality (VR) display device.

[0090] The following points need to be explained:

[0091] (1) In the attached drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.

[0092] (2) Without conflict, the features in the same embodiment and different embodiments of the present disclosure can be combined with each other.

[0093] The above description is only an exemplary implementation manner of the present disclosure, rather than being used to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A display device, comprising: A display panel; A lens structure located on the light-emitting side of the display panel, and the surface of the lens structure close to the display panel is a curved surface; A dimming structure located between the display panel and the lens structure, wherein the dimming structure includes a plurality of microstructures arranged in a plane perpendicular to the optical axis of the lens structure, and the dimension of the microstructure parallel to the optical axis is its height, The lens structure at least includes a first region and a second region, the second region is farther from the center of the lens structure than the first region, the first region includes the center of the lens structure, and the height of the microstructure corresponding to the first region is smaller than the height of the microstructure corresponding to the second region.

2. The display device according to claim 1, wherein, The main ray angle of the light emitted from the position of the display panel corresponding to the second region is CRA1, the main ray angle of the lens structure is CRA2, the difference between CRA1 and CRA2 is CRA0, and relative to the case where the microstructures are removed from the optical path from the display panel to the lens structure, the ratio of the value of the change in the main ray angle of the light emitted from the position of the display panel corresponding to the second region after passing through the corresponding microstructures to CRA0 is 0.8 to 1.

2.

3. The display device according to claim 1, wherein, The microstructure corresponding to the first region is configured to basically not change the main ray angle of the light emitted from the display panel after passing through the microstructure, and the microstructure corresponding to the second region is configured to make the main ray angle of the light emitted from the display panel after passing through the microstructure smaller compared to the case where the microstructures are removed from the optical path from the display panel to the lens structure.

4. The display device according to claim 1, wherein, The display panel includes a plurality of sub-pixels, and the angle between the main ray of the light emitted from the sub-pixels after passing through the microstructures and the optical axis is 0 to 75 degrees.

5. The display device according to claim 1, wherein, The shape of at least one microstructure is columnar.

6. The display device according to claim 1, wherein, The height is 10 nanometers to 2000 micrometers.

7. The display device according to claim 1, wherein, The maximum dimension of the microstructure in the direction perpendicular to the optical axis is 0.8 to 100 micrometers.

8. The display device according to claim 7, wherein, The ratio of the maximum dimensions of different microstructures in the direction perpendicular to the optical axis is 0.9 to 1.

1.

9. The display device according to claim 7, wherein, The distance between adjacent microstructures is 0.8 to 100 micrometers.

10. The display device according to claim 1, wherein, The minimum distance between the curved surface of the lens structure and the display panel is 0.2 to 50 millimeters, and the minimum distance between the curved surface of the lens structure and the dimming structure is 0 to 10 millimeters.

11. The display device according to any one of claims 1-10, wherein, The material of the microstructure includes glass, plastic, light-transmitting oxide material or metal material.

12. The display device according to any one of claims 1 to 10, wherein, The radius of curvature of the curved surface is -300 to 300 millimeters.

13. The display device according to any one of claims 1-10, wherein, The center of the curved surface is closer to the display panel than the edge, and in the direction from the center of the lens structure to the edge, the height of the microstructure corresponding to the second region among the plurality of microstructures gradually increases.

14. The display device according to claim 13, wherein, The second region includes a plurality of annular sub-regions, the plurality of annular sub-regions are arranged in sequence in the direction from the center to the edge, and the heights of different microstructures corresponding to the same annular sub-region are the same.

15. The display device according to claim 13, wherein, In the direction from the center to the edge, the heights of the microstructures corresponding to different annular sub-regions gradually increase.

16. The display device according to any one of claims 1-10, wherein, The curved surface includes a spherical surface, an aspherical surface or a free-form surface.

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