Anti-glare layer and display device

Abstract

The present application provides an anti-glare layer and a display device. The anti-glare layer comprises a bottom surface and a microstructure surface opposite to each other; wherein the microstructure surface has a plurality of microstructures. In the normal direction of the bottom surface, the point closest to the bottom surface of the microstructure passes through a virtual reference surface parallel to the bottom surface, and k virtual cross sections are defined in the normal direction on the side opposite to the bottom surface from the virtual reference surface, and each virtual cross section is separated by a distance D. In the design, the relationship between the cross-sectional area of the plurality of microstructures on the nth virtual cross section, the average angle between the microstructure and the intersection position of the nth virtual cross section, and the area of the bottom surface conforms to a certain relationship formula, so as to improve the brightness of large-angle display and increase the user experience when viewing at a large angle. In addition, the present application can also take into account a certain anti-glare effect.

Description

Technical Field

[0001] The present invention relates to an anti-glare layer and a display device comprising the anti-glare layer; more specifically, the present invention relates to an anti-glare layer having the function of improving the brightness of a wide viewing angle display and a display device comprising the anti-glare layer. Background Technology

[0002] Flat and curved display devices have been widely used in various electronic devices, such as mobile phones, wearable devices, televisions, mainframes for vehicles, personal computers, digital cameras, and handheld game consoles. However, in order to improve the user's visual experience, manufacturers are constantly improving the optical performance of display devices.

[0003] For example, some display devices may experience glare due to ambient light during use. In most situations, glare can cause visual discomfort for some users and affect the optical performance of the displayed image. To address this issue, some existing display devices incorporate a high-haze layer on the display surface to reduce glare. However, high haze levels often result in a significant decrease in display brightness at wide viewing angles, making the displayed image difficult to view at these angles and negatively impacting the user experience. Summary of the Invention

[0004] Technical means to solve the problem

[0005] To address the aforementioned problems, an anti-glare layer is proposed according to an embodiment of the present invention, comprising a bottom surface and a microstructure surface that are opposite to each other; wherein the microstructure surface has multiple microstructures. In the direction perpendicular to the normal of the bottom surface, the point of the microstructure closest to the bottom surface passes through a virtual reference surface parallel to the bottom surface. From the virtual reference surface on the side opposite to the bottom surface, k virtual cross-sections are sequentially defined in the normal direction, and the spacing D between each virtual cross-section is in μm. Among them, the microstructure surfaces meet the following conditions:

[0006] in: An represents the cross-sectional area of ​​the aforementioned microstructures on the nth virtual cross-section, in μm². 2 ; The angle between the aforementioned microstructure and the nth virtual cross-section is the average angle between them. Atotal is the area of ​​the base, in μm. 2 .

[0007] Another embodiment of the present invention provides a display device comprising a display panel and the aforementioned anti-glare layer. The display panel has a display surface, and the anti-glare layer is disposed on the display surface.

[0008] Compared with the effectiveness of previous technologies

[0009] The anti-glare layer and display device provided according to the various embodiments of the present invention can improve the brightness of wide-viewing-angle displays, thereby enhancing the user experience when viewing from a wide viewing angle. Furthermore, the present invention also achieves a certain degree of anti-glare effect. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a display device according to an embodiment of the present invention.

[0011] Figure 2 This is a schematic cross-sectional view of an anti-glare layer according to an embodiment of the present invention.

[0012] Figure 3 This is illustrative virtual cross-sectional image data.

[0013] Figure 4 This is a schematic diagram showing the superposition of microstructure cross-sectional ranges on adjacent virtual cross-sections.

[0014] The reference numerals in the attached figures are explained as follows: 100 Display Panel 110 display surface 300 Anti-glare Layer 301 Bottom 303 microstructure surface 310 Microstructure 510 Virtual Reference Surface P1, P2, ... P k Virtual cross section Detailed Implementation

[0015] Various embodiments will be described below, and those skilled in the art should readily understand the spirit and principles of the invention by referring to the description and accompanying drawings. However, while specific embodiments will be described in detail herein, these embodiments are merely illustrative and are not intended to be limiting or exhaustive in any respect. Therefore, various changes and modifications to the invention will be readily apparent and easily achievable by those skilled in the art without departing from the spirit and principles of the invention.

[0016] In the accompanying drawings, the thicknesses of layers, films, panels, regions, etc., are enlarged for clarity. Throughout the specification, the same element symbols denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it may be directly on or connected to the other element, or intermediate elements may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected" to another element, no intermediate elements are present. As used herein, "connection" can refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may mean that other elements exist between the two elements.

[0017] The terminology used herein is for the purpose of describing particular embodiments only and is not restrictive. As used herein, unless the content clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include multiple forms, including “at least one.” “Or” means “and / or.” As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It should also be understood that, when used in this specification, the terms “comprising” and / or “including” specify the presence or addition of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or combinations thereof.

[0018] This document describes exemplary embodiments with reference to cross-sectional views, which are schematic diagrams of idealized embodiments. Therefore, variations in shape as a result of, for example, manufacturing techniques and / or tolerances, are contemplated. Consequently, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but rather include, for example, shape deviations caused by manufacturing processes. For example, regions shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, acute angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to show the precise shapes of the regions, nor are they intended to limit the claims.

[0019] This invention provides a display device and an anti-glare layer disposed thereon. The display device is preferably a computer monitor, television, surveillance camera, automotive head unit, etc. Furthermore, the display device can also be used in other electronic devices, such as as a display screen for mobile phones, digital cameras, handheld game consoles, etc.

[0020] like Figure 1As shown, in one embodiment of the present invention, the display device includes a display panel 100 and an anti-glare layer 300. The display panel 100 may be a liquid crystal display panel, an organic light-emitting diode display panel, a micro-light-emitting diode display panel, an electrophoretic display panel, or other types of display panels. The anti-glare layer 300 is preferably attached to the display surface 110 of the display panel 100 to provide an optical effect that reduces glare.

[0021] Figure 2 This is a cross-sectional schematic diagram of the anti-glare layer 300; for ease of explanation, only a single microstructure 310 is shown as an example. Figure 2 In the illustrated embodiment, the anti-glare layer 300 has a bottom surface 301 and a microstructure surface 303 facing away from each other. The bottom surface 301 faces the display surface 110 and is preferably attached to the display surface 110. The microstructure surface 303 has a plurality of microstructures 310. Figure 1 and Figure 2 As shown, these microstructures 310 are preferably cone-shaped structures that are narrow at the top and wide at the bottom, and have irregular height, cross-sectional shape and distribution density.

[0022] like Figure 2 As shown, a hypothetical virtual reference plane 510 can be defined. Preferably, the virtual reference plane 510 is the lowest point of the microstructure 310 in the normal direction Z perpendicular to the bottom surface 301, that is, the point closest to the bottom surface 301. The virtual reference plane 510 is preferably perpendicular to the normal direction Z and parallel to the bottom surface 301. On the side of the virtual reference plane 510 opposite to the bottom surface 301, k hypothetical virtual sections P1, P2, ... P are defined. k These virtual cross-sections P1, P2, ... P k They are arranged sequentially from a predetermined position away from the virtual reference plane 510 in a direction away from the virtual reference plane 510, that is, along the normal direction Z. Virtual sections P1, P2, ... P k Ideally, they should be perpendicular to the normal direction Z and parallel to each other. Furthermore, adjacent virtual sections P1, P2, ... P k The interval is a distance D in μm along the normal direction Z; that is, the nth virtual cross section P. n and the (n+1)th virtual cross section P n+1 There is a spacing D between them. In this embodiment, the spacing D is 0.5 μm; however, in other embodiments, the spacing D may also be 0.25 μm or other suitable lengths.

[0023] Ideally, the number of virtual sections k should conform to the following formula: 5 ≦ k ≦ 12 In addition, the k-th virtual cross section P kThe distance from the point on the microstructure 310 furthest from the bottom surface 301 (i.e., the point with the highest elevation on the microstructure surface 303) in the normal direction is less than the spacing D, to ensure that each virtual section intersects with at least a portion of the microstructure 310. Based on the above relationship, the appropriate spacing D can be determined by combining the height difference between the highest and lowest points of the microstructures 310 with the above formula.

[0024] In this embodiment, the distance d between the first virtual cross-section P1, which is closest to the virtual reference plane 510, and the virtual reference plane 510 is twice the spacing D; that is, when the spacing D is 0.5 μm, the distance d between the first virtual cross-section P1 and the virtual reference plane 510 is 1 μm. Since the surface of the microstructure 310 closer to the bottom has less impact on the optical effect, this setting can reduce the impact of the microstructure 310 being closer to the bottom on the subsequent evaluation. However, in different instances, the distance between the first virtual cross-section P1 and the virtual reference plane 510 can be other values, or it can be used as the virtual reference plane 510.

[0025] In defining the virtual reference plane 510 and virtual sections P1, P2, ... P1 as described above k Then, based on this, the structural properties of the microstructure 303 can be designed. Specifically, the structural property indices of the microstructure surface 303 can be made to meet the following conditions: Structural property indicators

[0026] in: A n For these microstructures 310 at the nth virtual cross section P n The cross-sectional area on the surface is expressed in μm. 2 ; For these microstructures 310 and the nth virtual cross-section P n The average included angle at the boundary; A total The area of ​​the base 301 is in μm. 2 .

[0027] By utilizing the aforementioned structural properties of the microstructure surface 303, it is possible to provide anti-glare effects while maintaining a wide viewing angle, thereby improving the problem of significant brightness reduction at wide viewing angles caused by traditional anti-glare designs.

[0028] Figure 3 The figure shows the nth virtual cross section P as an example. n Image data showing the cross-sectional shape and distribution of each microstructure 310, including the regions with cross-sectional lines and the cross-sectional range of the microstructure 310. In this embodiment, when calculating A... nWhen the value is set, the virtual cross-section P can be calculated by the proportion of pixels covered by the 310 cross-section of the microstructure in the image to the total number of pixels in the entire image. n The total cross-sectional area A of each of the microstructures 310 n Furthermore, when interpreting the aforementioned images, the boundary pixels of each microstructure 310 can be identified first using horizontal and vertical scanning methods. Then, the boundaries of the cross-sectional area of ​​each microstructure 310 can be constructed based on these boundary pixels to calculate the cross-sectional area. However, in different embodiments, the total cross-sectional area A of the microstructures on each virtual cross-section can also be obtained in other ways. n The value of or other physical quantities with similar meaning.

[0029] In one embodiment, the average included angle The following relationship can be used to obtain the result: ;and

[0030] Specifically, such as Figure 4 As shown, a virtual cross section P can be used. n and adjacent virtual cross section P n+1 The cross section C of each of the upper microstructures 310 n and C n+1 The differences in cross-sectional area within the range are appropriately addressed, and a spacing D is used to reflect the approximate average angle of the slope of the microstructure surface 303 at various elevation sections. This setting further saves time in evaluating and adjusting the microstructure surface 303 and improves feasibility.

[0031] Furthermore, to achieve an anti-glare effect, the microstructures 310 on the microstructure surface 303 must be designed to conform to specific structural properties. For example, in one embodiment, the microstructure surface 303 has an arithmetic mean height Ra and a kurtosis Rku. An exemplary definition of the arithmetic mean height Ra can be the average of the absolute values ​​of the curve values ​​at points along a reference length taken from the roughness curve of the microstructure surface 303; an exemplary definition of the kurtosis Rku can be the power-four average of Z(x) over a reference length that has been undimensionized using the power-four of the root mean square height. The arithmetic mean height Ra and kurtosis Rku of the microstructure surface 303 preferably conform to the following relationship: Ra × Rku ≧ 0.95 μm In another embodiment, the kurtosis Rku of the microstructure surface 303 must satisfy the following relationship: 2.36≦Rku≦4.35 In another embodiment, the arithmetic mean height Ra of the microstructure surface 303 must satisfy the following relationship: 0.39 μm≦Ra≦0.42 μm The arithmetic mean height Ra and kurtosis Rku of the aforementioned microstructure surface 303 can be designed in conjunction with the structural properties of the microstructure surface 303 shown in the previous embodiment to maintain a balance between anti-glare capability and brightness over a wide viewing angle. In other words, by utilizing the structural properties of the aforementioned microstructure surface 303, the anti-glare layer can increase the brightness of the display over a wide viewing angle while maintaining good anti-glare capability.

[0032] The above description is merely some preferred embodiments of the present invention. It should be noted that various changes and modifications can be made to the present invention without departing from its spirit and principles. Those skilled in the art will understand that the present invention is defined by the appended claims, and that various possible substitutions, combinations, modifications, and uses, etc., within the scope defined by the appended claims, are all within the intent of the present invention.

Claims

1. An anti-glare layer, comprising: One bottom surface; and A microstructured surface, opposite to the bottom surface, has multiple microstructures; among them, In a normal direction perpendicular to the bottom surface, the point of the plurality of microstructures closest to the bottom surface passes through a virtual reference plane parallel to the bottom surface. From the virtual reference plane on the side opposite to the bottom surface, k virtual cross sections are sequentially defined in the normal direction, with a spacing D between each virtual cross section. The microstructure surface meets the following conditions: Where An is the cross-sectional area of ​​the plurality of microstructures on the nth virtual cross-section, in μm. 2 ; The average angle between the plurality of microstructures and the nth virtual cross-section; Atotal is the area of ​​the base surface, in μm. 2 ;as well as The unit of D is μm.

2. The anti-glare layer as claimed in claim 1, wherein in the normal direction, a distance d between the virtual reference plane and the nearest first virtual cross-section is twice the spacing D.

3. The anti-glare layer as claimed in claim 1, wherein the spacing D is 0.5 μm.

4. The anti-glare layer as claimed in claim 3, wherein 5 ≦ k ≦ 12.

5. The anti-glare layer as described in claim 1, wherein: ;and 。 6. The anti-glare layer as claimed in claim 1, wherein the distance between the k-th virtual cross section and the point of the plurality of microstructures furthest from the bottom surface in the normal direction is less than the spacing D.

7. The anti-glare layer as claimed in claim 1, wherein the microstructure mask has an arithmetic mean height Ra and a kurtosis Rku, conforming to the following relationship: Ra × Rku ≧ 0.95 μm.

8. The anti-glare layer as claimed in claim 1, wherein the microstructure mask has an arithmetic mean height Ra, conforming to the following relationship: 0.39 μm≦Ra≦0.42 μm.

9. The anti-glare layer as claimed in claim 1, wherein the microstructure mask has a kurtosis Rku, conforming to the following relationship: 2.36≦Rku≦4.

35.

10. A display device comprising: A display surface, wherein the display surface is provided with an anti-glare layer as described in any one of claims 1 to 9.

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