Cover plate and display device

Abstract

The utility model relates to the technical field of display, particularly provides a cover plate and a display device, and aims to solve the problem of chromatic aberration between a display area and a black light resistance area of an existing display device. In order to achieve the purpose, the cover plate comprises a light-transmitting area and a light-shielding area surrounding the light-transmitting area, and the cover plate comprises a transparent substrate which comprises a first surface and a second surface opposite to the first surface; the anti-reflection layer is arranged on the first surface; the anti-reflection layer at least covers the shading area; and the light shielding layer is positioned in the light shielding area and is arranged on the anti-reflection layer. The anti-reflection layer is additionally arranged between the transparent substrate and the light shielding layer, the reflectivity of the area where the light shielding layer is located can be reduced, the reflectivity of the black light resistance area and the reflectivity of the display area of the display device tend to be consistent, and therefore the color difference of the black light resistance area and the display area is reduced, and the appearance visual effect of the display device is improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and specifically provides a cover plate and a display device. Background Art

[0002] With the continuous development of display technologies, users' requirements for the displays of display devices are also getting higher and higher. Currently, in the display devices on the market, after the cover plate and the display module are adhered together, a relatively obvious color difference often forms between the display area of the display device and the black photoresist area around the display area, thus affecting the user experience. Summary of the Utility Model

[0003] This application aims to solve the above technical problems, that is, to solve the problem of color difference between the display area and the black photoresist area of the existing display device.

[0004] In a first aspect, this application provides a cover plate, including a light-transmitting area and a light-shielding area surrounding the light-transmitting area. The cover plate includes:

[0005] A transparent substrate, including a first surface and a second surface opposite to the first surface;

[0006] An anti-reflection layer disposed on the first surface, and the anti-reflection layer at least covers the light-shielding area;

[0007] A light-shielding layer located in the light-shielding area, disposed on the anti-reflection layer.

[0008] In a technical solution of the above cover plate, the anti-reflection layer covers the light-transmitting area and the light-shielding area.

[0009] In a technical solution of the above cover plate, the refractive index of the anti-reflection layer is 1.6 - 1.7, and the thickness of the anti-reflection layer is 10 - 50 nm.

[0010] In a technical solution of the above cover plate, the anti-reflection layer is made of SION material with a thickness of 40 nm.

[0011] In a technical solution of the above cover plate, the cover plate further includes:

[0012] A first anti-ghosting layer covering the light-shielding area and the light-transmitting area, disposed on the light-shielding layer;

[0013] A touch layer disposed on the first anti-ghosting layer;

[0014] A second anti-ghosting layer disposed on the touch layer.

[0015] In a technical solution of the above cover plate, the first anti-ghosting layer is made of SION material with a thickness of 20 - 80 nm; and / or

[0016] The second anti-reflection layer is made of SION material and has a thickness of 40 - 100 nm.

[0017] In one technical solution of the above cover plate, the touch layer includes a plurality of first metal traces extending in a first direction, a plurality of second metal traces extending in a second direction, and insulating blocks disposed between the first metal traces and the second metal traces;

[0018] Wherein, the first direction and the second direction are cross - arranged, and the cross - positions of the second metal traces and the first metal traces are electrically isolated by the insulating blocks.

[0019] In one technical solution of the above cover plate, the light - shielding layer includes openings to expose the anti - reflection layer, and the first anti - reflection layer fills the openings.

[0020] In one technical solution of the above cover plate, the cover plate further includes an anti - reflection film disposed on the second surface.

[0021] In a second aspect, the present application provides a display device, which includes:

[0022] The cover plate according to any one of the first aspect;

[0023] A display module, including a display area and a peripheral area, wherein the display area and the light - transmitting area are correspondingly bonded, and the peripheral area and the light - shielding area are correspondingly bonded.

[0024] In the case of adopting the above - mentioned technical solutions, the present application sets an anti - reflection layer between the transparent substrate and the light - shielding layer. Light forms a first reflected light at the interface between the transparent substrate and the anti - reflection layer, and light forms a second reflected light at the interface between the anti - reflection layer and the light - shielding layer. The first reflected light and the second reflected light at least partially cancel each other out by interference at the peaks and valleys in their propagation paths, thereby reducing the reflectivity of the area where the light - shielding layer is located, and thus reducing the color difference in the display area of the black photoresist area.

[0025] Furthermore, by adjusting the refractive index and thickness of the anti - reflection layer, the reflection path of light can be changed, so as to find the reflection L value closest to the light - transmitting area, making the reflectivities of the black photoresist area and the display area of the display device tend to be consistent, and making the overall appearance of the display device present a visual effect of "integrated black". Description of the Drawings

[0026] The following describes the preferred embodiments of the present application with reference to the accompanying drawings. In the drawings:

[0027] Figure 1 is a longitudinal cross - sectional schematic view of a cover plate according to an embodiment of the present application;

[0028] Figure 2It is a schematic longitudinal sectional view of a cover plate at its opening position according to an embodiment of the present application;

[0029] Figure 3 It is a partial top view of the position where the touch layer is located according to an embodiment of the present application (the dotted line in the figure indicates that the line segment is blocked).

[0030] Figure 4 It is a schematic longitudinal sectional view of a display device according to an embodiment of the present application.

[0031] In the figure, the reference numerals refer to the following:

[0032] 1, transparent substrate; 11, first surface; 12, second surface; 2, anti-reflection layer; 3, light-shielding layer; 31, opening; 4, first shadow-eliminating layer; 5, touch layer; 51, first metal trace; 52, second metal trace; 53, insulating block; 6, second shadow-eliminating layer; 7, anti-reflection enhancement film; 8, insulating layer; 9, optical adhesive layer;

[0033] 100, light-shielding area; 200, light-transmitting area; 300, display module; 310, display area; 320, peripheral area. Specific Embodiments

[0034] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0035] It should be noted that in the description of the present application, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In addition, it should also be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0037] In the off-screen state of the display device, the display area and the surrounding black photoresist area have a color difference, which results in a decline in the user experience. Especially for the OGS (One Glass Solution) touch module, the refractive index of the ITO electrode layer etched on the glass substrate is quite different from that of the glass substrate, making the visually obvious difference between the etched ITO pattern and other areas. Therefore, the concept of "integrated black" is proposed. "Integrated black" means that in the off-screen state of the display device, the color difference between the black photoresist area and the display area tends to be consistent, thereby improving the visual appearance effect of the display device.

[0038] In some related technologies, in order to pursue the "integrated black" effect of the display device, the method of adjusting the material of the black photoresist area is adopted. For example, when the material of the black photoresist area is black ink, the color of the ink is adjusted. However, it is difficult to obtain a solution that matches the color of the display area more closely, and the effect is not ideal. Or in some other ways, a shadow elimination layer is set near the ITO electrode in the display area. Based on the principle of light interference, although the shadow elimination layer has a certain shadow elimination effect on the ITO pattern, it does not have a significant effect on improving the color difference between the black photoresist area and the display area. Therefore, the above methods are not very helpful for the "integrated black" requirement of the display device.

[0039] Refer to Figure 1 , which is a schematic longitudinal cross-sectional view of a cover plate according to an embodiment of the present application. The cover plate is used to be installed on the light-emitting side of the display module to form a display device. In the present application, a touch display device is taken as an example for illustration.

[0040] The cover plate includes a transparent substrate 1, an antireflection layer 2, a light-shielding layer 3, a first shadow elimination layer 4, a touch layer 5, and a second shadow elimination layer 6.

[0041] For the convenience of description, the cover plate is divided into a light-transmitting area 200 and a light-shielding area 100 surrounding the light-transmitting area 200.

[0042] The transparent substrate 1 can be made of glass material, and it includes a first surface 11 and a second surface 12 opposite to the first surface 11. Among them, the antireflection layer 2 is disposed on the first surface 11, and the antireflection layer 2 can adopt SION material, and the SION material can include silicon nitride, silicon oxide (SiO x , SiN x , where x represents that there can be different stoichiometric ratios between element Si and N or between element Si and O) and other chemical substances. The antireflection layer 2 at least covers the light-shielding area 100. In an embodiment of the present application, the antireflection layer 2 covers the light-transmitting area 200 and the light-shielding area 100, that is, during the formation of the antireflection layer 2, the antireflection layer 2 is made to cover the entire first surface 11, so that the complexity of the process can be simplified.

[0043] The light-shielding layer 3 is disposed on the anti-reflection layer 2 and is located in the light-shielding area 100. The light-shielding layer 3 can be selected as a black photoresist material.

[0044] In an embodiment of the present application, an anti-reflection film 7 is further disposed on the second surface 12. The anti-reflection film 7 not only protects the cover plate, but also can increase the light transmittance, reduce the light reflection phenomenon on the surface of the cover plate, and improve the user experience.

[0045] It should be noted that when the user uses the display device, the light received by the human eye is the reflected light from the display device, that is, the ambient light first enters the display device, and the light reflected by the display device then enters the human eye. To facilitate the understanding of the technical solution of the present application, the concept of "reflected Lab value" is introduced. The reflected Lab value is a physical quantity used to characterize color difference, which can be measured by a color difference meter. When the color difference meter measures the color of the object surface, the light it receives will first be reflected from the object surface and then enter the light receiver of the color difference meter, thereby outputting the Lab value of the reflected light.

[0046] The Lab value includes three dimensions: L (lightness), a (red-green degree), and b (yellow-blue degree). These three physical quantities can be used to analyze the lightness, hue, saturation, etc. of colors. The difference in Lab values between two regions can be reflected by ΔE, as follows:

[0047] ΔE = SQRT[(L1 - L2) 2 + (a1 - a2) 2 + (b1 - b2) 2

[0048] In the above formula, SQRT is the square root, L1, a1, b1 are the color measurement values of the first region, and L2, a2, b2 are the color measurement values of the second region. In specific measurements, L represents lightness, and its value is between 0 - 100. a represents the range from red to green. When a is negative, it is green, and when a is positive, it is red. b represents the range from yellow to blue. When b is negative, it is blue, and when b is positive, it is yellow. The larger the value of ΔE, the greater the color difference between the two regions. The smaller the value of ΔE, the closer the colors of the two regions are.

[0049] Based on the above principle, it can be known that there is a color difference between the black photoresist area and the display area of the display device (the light-transmitting area of the cover plate corresponds to the display area, and the light-shielding area corresponds to the black photoresist area) because their reflected Lab values are different, that is, ΔE is too large. Therefore, in order to make the overall appearance of the display device present a "solid black" visual effect, the ΔE between the black photoresist area and the display area can be reduced. For the black area, excluding factors such as color and saturation, the main factor affecting the size of ΔE lies in lightness (L value). Therefore, based on this principle, the reflected L value of the black photoresist area can be reduced to reduce ΔE. ​

[0050] As described above, in order to reduce the reflection L value of the black photoresist region, an anti-reflection layer 2 is added between the transparent substrate 1 and the light-shielding layer 3 of the cover plate of the present application. The refractive index of the anti-reflection layer 2 needs to be greater than that of the transparent substrate 1, so that incident light can pass through the transparent substrate 1 and the anti-reflection layer 2 in sequence.

[0051] Refer to Figure 1 As shown in the figure, the arrows in the figure indicate the propagation path of light. It can be seen that by adding an anti-reflection layer 2 between the transparent substrate 1 and the light-shielding layer 3, when the light is incident on the interface S1 between the transparent substrate 1 and the anti-reflection layer 2, part of the light is refracted downward and part of the light is reflected. The reflected light here is called R1; the light refracted downward through the transparent substrate 1 is incident on the interface S2 between the anti-reflection layer 2 and the light-shielding layer 3, and similarly, part of the light will be reflected at the interface S2. The reflected light here is called R2. The two reflected lights R1 and R2 at least partially cancel each other out at the peaks and valleys, thereby reducing the reflectivity of the region where the light-shielding layer 3 is located. By adjusting the refractive index and thickness of the anti-reflection layer 2, the reflection path of the light can be changed, so as to find the reflection L value closest to the light-transmitting region 200, making the reflectivities of the black photoresist region and the display region of the display device tend to be the same, thereby reducing the color difference between the black photoresist region and the display region of the display device, and making the overall appearance of the display device present a "solid black" visual effect.

[0052] In some embodiments of the present application, the refractive index of the anti-reflection layer 2 is 1.6 - 1.7, and the thickness is 10 - 50 nm. Refer to Table 1 below. For the inventors, based on the fixed refractive index of the anti-reflection layer 2 and different thickness values, the Lab values and ΔE values of the black photoresist region and the display region are measured through numerical simulation and actual experiments.

[0053]

[0054] Table 1

[0055] As can be seen from the above table, when the thickness of the anti-reflection layer 2 takes the above values, when the thickness of the anti-reflection layer 2 is 40 nm, the value of ΔE is the smallest. Therefore, in an embodiment of the present application, the thickness of the anti-reflection layer 2 is 40 nm.

[0056] Refer to Figure 1 As shown in the figure, the first shadow elimination layer 4 is disposed on the light-shielding layer 3, and the first shadow elimination layer 4 covers the light-shielding region 100 and the light-transmitting region 200. The touch control layer 5 is disposed on the first shadow elimination layer 4, and the second shadow elimination layer 6 is disposed on the touch control layer 5.

[0057] In the present application, the first shadow elimination layer 4 and the second shadow elimination layer 6 are respectively disposed on both sides of the touch control layer 5. By using the principle of thin film interference of light, the reflection spectra of the regions with ITO electrode patterns and the regions without ITO electrode patterns in the touch control layer 5 tend to be the same (ΔE tends to 0), so as to achieve the purpose of "shadow elimination".

[0058] In some embodiments of the present application, both the first shadow elimination layer 4 and the second shadow elimination layer 6 are made of SION material. Similarly, by adjusting the refractive index and thickness of the first shadow elimination layer 4 and the second shadow elimination layer 6, an optimal parameter combination for the shadow elimination effect can be obtained. Through the simulation analysis and experimental verification of the inventor, the thickness of the first shadow elimination layer 4 is set to 20 - 80 nm, and the thickness of the second shadow elimination layer 6 is set to 40 - 100 nm. Adjusting within the above range can obtain a better shadow elimination effect.

[0059] Referring to Figure 1 , an insulating layer 8 is further provided on the second shadow elimination layer 6. The insulating layer 8 covers the second shadow elimination layer 6 and plays a role in encapsulating and protecting the second shadow elimination layer 6 and other film layers.

[0060] Referring to Figure 2 , it is a longitudinal sectional view of the cover plate at the opening position according to an embodiment of the present application. An opening 31 is provided on the light-shielding layer 3, and the opening 31 penetrates through to the anti-reflection layer 2, thereby exposing the anti-reflection layer 2. The first shadow elimination layer 4 is filled in the opening 31. Among them, the opening 31 can be a camera hole, an IR hole, etc.

[0061] By providing the anti-reflection layer 2 between the transparent substrate 1 and the light-shielding layer 3, the color difference between the area where the opening 31 is located and the surrounding light-shielding layer 3 can also be reduced, so that the camera hole and IR hole of the display device form a "black integration" visual effect with the black photoresist area.

[0062] Referring to Figure 3 , it is a partial top view of the position where the touch layer is located according to an embodiment of the present application. The touch layer 5 includes a first metal trace 51, a second metal trace 52, and an insulating block 53. The first metal trace 51 extends along a first direction and a plurality of them are arranged side by side. The second metal trace 52 extends along a second direction and a plurality of them are arranged side by side. Optionally, the first metal trace 51 is a TX trace, and the second metal trace 52 is an RX trace. Among them, the first direction and the second direction intersect with each other. Optionally, the first direction and the second direction can be orthogonal directions. The insulating block 53 is provided between the first metal trace 51 and the second metal trace 52, at the intersection position of the first metal trace 51 and the second metal trace 52, so that the first metal trace 51 and the second metal trace 52 are electrically isolated through the insulating block 53. The insulating block 53 plays a "bridging" role to avoid signal crosstalk between the first metal trace 51 and the second metal trace 52.

[0063] Of course, the above method is only an optional method of the present application and does not constitute a limitation to the present application. For example, in some other implementation manners, an insulating layer may also be provided between the first metal trace 51 and the second metal trace 52. By respectively providing vias on both sides of the intersection position of the first metal trace 51 and the second metal trace 52 on the insulating layer, the portions of the first metal trace 51 or the second metal trace 52 on both sides of the intersection position are electrically connected through the vias.

[0064] Referring to Figure 4 , the present application also discloses a display device, which includes a display module 300 and the cover plate in any of the above embodiments. Optionally, the display module 300 and the cover plate are fixed through an optical adhesive layer 9, so as to realize the fitting of the display module 300 and the cover plate. Among them, the display module 300 includes a display area 310 and a peripheral area 320. The display area 310 is correspondingly fitted with the light-transmitting area 200 of the cover plate, and the peripheral area 320 is correspondingly fitted with the light-shielding area 100 of the cover plate. The peripheral area 320 of the display module and the light-shielding area 100 of the cover plate correspond to the black photoresist area described above.

[0065] The display module in the above includes but is not limited to an LCD display module, an OLED display module, etc. The present application does not limit its specific type.

[0066] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A cover plate, comprising a light-transmitting area and a light-shielding area surrounding the light-transmitting area, characterized in that, The cover plate includes: a transparent substrate including a first surface and a second surface opposite to the first surface; an anti-reflection layer disposed on the first surface, the anti-reflection layer at least covering the light-shielding region; a light-shielding layer located in the light-shielding region, disposed on the anti-reflection layer.

2. The cover plate according to claim 1, characterized in that, The anti-reflection layer covers the light-transmitting region and the light-shielding region.

3. The cover plate according to claim 1, wherein The refractive index of the anti-reflection layer is 1.6 - 1.7, and the thickness of the anti-reflection layer is 10 - 50 nm.

4. The cover plate according to claim 3, wherein, The anti-reflection layer is made of SION material with a thickness of 40 nm.

5. The cover plate according to any one of claims 1 to 4, characterized in that The cover plate further includes: a first anti-glare layer covering the light-shielding region and the light-transmitting region, disposed on the light-shielding layer; a touch layer disposed on the first anti-glare layer; a second anti-glare layer disposed on the touch layer.

6. The cover plate according to claim 5, wherein The first anti-glare layer is made of SION material with a thickness of 20 - 80 nm; and / or The second anti-glare layer is made of SION material with a thickness of 40 - 100 nm.

7. The cover plate according to claim 5, wherein The touch layer includes a plurality of first metal traces extending in a first direction, a plurality of second metal traces extending in a second direction, and insulating blocks disposed between the first metal traces and the second metal traces; wherein the first direction and the second direction are cross-set, and the cross positions of the second metal traces and the first metal traces are electrically isolated by the insulating blocks.

8. The cover plate according to claim 5, characterized in that, The light-shielding layer includes openings to expose the anti-reflection layer, and the first anti-glare layer fills the openings.

9. The cover plate according to claim 1, characterized in that, The cover plate further includes an anti-reflection film disposed on the second surface.

10. A display device, characterized in that, Including: the cover plate according to any one of claims 1 - 9; a display module including a display area and a peripheral area, the display area and the light-transmitting area are correspondingly bonded, and the peripheral area and the light-shielding area are correspondingly bonded.

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