Cover plate and display device

Abstract

The invention discloses a cover plate and a display device. The cover plate comprises two base material layers arranged in a stacked mode and an optical adhesive layer located between the two base material layers, and the edges of the base material layers extend out of the edges of the optical adhesive layer; at least one of the two base material layers is provided with a desorption structure, the desorption structure is located on the surface, facing the optical adhesive layer, of the base material layer and extends out of the optical adhesive layer, and the water drop angle of the desorption structure is larger than or equal to 90 degrees. Thus, the desorption structure is arranged on the edge of the base material layer, and the water drop angle of the desorption structure is larger than or equal to 90 degrees, so that the adhesion effect between the optical adhesive layer and the edge of the base material layer is reduced, the pulling degree of the optical adhesive layer on the edge of the base material layer after extrusion and unloading is reduced, namely the adhesive pulling phenomenon of the optical adhesive layer is reduced, and the service life of the optical adhesive layer is prolonged. And the reliability of the cover plate is improved.

Description

Technical Field

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

[0002] In the cover plate of the display panel, an optical adhesive layer is usually used to bond the two substrate layers, and the edges of the substrate layers are not bonded. Therefore, when the cover plate is made and bent, the optical adhesive layer will expand toward the edge of the substrate layer due to extrusion, and the optical adhesive layer expanded to the edge of the substrate layer will bond with the substrate layer. Then, after the optical adhesive layer is no longer squeezed, the optical adhesive layer will shrink, which will cause the optical adhesive layer bonded to the edge of the substrate layer to separate from the substrate layer. During the separation process, the optical adhesive layer will be pulled, that is, the adhesive pulling phenomenon will occur, which will cause the optical adhesive layer to be damaged and reduce the reliability of the cover plate.

[0003] Therefore, how to improve the reliability of the cover plate has become a technical problem to be solved urgently in this field. Summary of the invention

[0004] The embodiments of the present invention provide a cover plate and a display device, which are used to improve the reliability of the cover plate.

[0005] In a first aspect, an embodiment of the present invention provides a cover plate for a display panel, comprising: two stacked substrate layers, an optical adhesive layer located between the two substrate layers, an edge of the substrate layer extending beyond an edge of the optical adhesive layer;

[0006] At least one of the two substrate layers is provided with a desorption structure, and the desorption structure is located at: a portion of the substrate layer that faces the surface of the optical adhesive layer and extends out of the optical adhesive layer, and a water drop angle of the desorption structure is greater than or equal to 90°.

[0007] In a second aspect, an embodiment of the present invention provides a display device, including: a display panel, and a cover plate as described in the first aspect above, which is located on a light emitting surface of the display panel.

[0008] The beneficial effects of the present invention are as follows:

[0009] A cover plate and a display device provided by an embodiment of the present invention include: two stacked substrate layers, an optical adhesive layer located between the two substrate layers, and the edge of the substrate layer extending out of the edge of the optical adhesive layer; at least one of the two substrate layers is provided with a desorption structure, and the desorption structure is located at: the surface of the substrate layer facing the optical adhesive layer and extending out of the optical adhesive layer, and the water drop angle of the desorption structure is greater than or equal to 90°. In this way, by providing a desorption structure at the edge of the substrate layer, and the water drop angle of the desorption structure is greater than or equal to 90°, the adhesion between the optical adhesive layer and the edge of the substrate layer is reduced, thereby reducing the degree of pulling of the optical adhesive layer at the edge of the substrate layer after extrusion and unloading, that is, reducing the glue pulling phenomenon of the optical adhesive layer, and improving the reliability of the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A cross-sectional schematic diagram of a first cover plate provided in an embodiment of the present invention;

[0011] Figure 2 It is a schematic diagram of an orthographic projection of a desorption structure provided in an embodiment of the present invention on a substrate layer;

[0012] Figure 3 is a cross-sectional schematic diagram of a second cover plate provided in an embodiment of the present invention;

[0013] Figure 4 A cross-sectional schematic diagram of a third cover plate provided in an embodiment of the present invention;

[0014] Figure 5 is a cross-sectional schematic diagram of a fourth cover plate provided in an embodiment of the present invention;

[0015] Figure 6 A cross-sectional schematic diagram of a display device provided in an embodiment of the present invention;

[0016] Figure 7 It is a cross-sectional schematic diagram of another display device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings to describe in detail a specific implementation of a cover plate and a display device provided by an embodiment of the present invention. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] An embodiment of the present invention provides a cover plate for a display panel, such as Figure 1As shown, it includes: two stacked substrate layers 100, an optical adhesive layer 200 located between the two substrate layers 100, and the edge of the substrate layer 100 extends beyond the edge of the optical adhesive layer 200;

[0019] At least one of the two substrate layers 100 is provided with a desorption structure 300 . The desorption structure 300 is located at: a portion of the substrate layer 100 that faces the surface of the optical adhesive layer 200 and extends out of the optical adhesive layer 200 . The water drop angle of the desorption structure 300 is greater than or equal to 90°.

[0020] In this way, by providing a desorption structure at the edge of the substrate layer, and the water drop angle of the desorption structure is greater than or equal to 90°, the adhesion between the optical adhesive layer and the edge of the substrate layer is reduced, thereby reducing the degree of pulling of the optical adhesive layer at the edge of the substrate layer after extrusion and unloading, that is, reducing the adhesive pulling phenomenon of the optical adhesive layer and improving the reliability of the cover plate.

[0021] Among them, the materials of the two substrate layers can be the same or different, and the materials of the two substrate layers include but are not limited to: PET (Polyethylene Terephthalate), CPI (Colorless Polyimide), UTG (Ultra Thin Glass), TPU (Thermoplastic Polyurethanes) and other materials.

[0022] In addition, if Figure 2 As shown, Figure 2 The diagram is a schematic diagram of the orthographic projection of the desorption structure 300 on the substrate layer 100. The edge of the substrate layer 100 is provided with a desorption structure 300 arranged in a ring shape. In this way, when the optical adhesive layer 200 expands toward the edge of the substrate layer 100 due to extrusion, the optical adhesive layer 200 will expand in all directions. By providing the desorption structure 300 arranged in a ring shape at the edge of the substrate layer 100, the adhesion between the optical adhesive layer 200 and the edge of the substrate layer 100 can be reduced in all directions, thereby reducing the adhesive pulling phenomenon of the optical adhesive layer 200 and improving the reliability of the cover.

[0023] Optionally, the water drop angle of the desorption structure can be further set to be greater than or equal to 105°, thereby further reducing the adhesion between the edge of the optical adhesive layer and the substrate layer, further alleviating the adhesive pulling phenomenon of the optical adhesive layer, and improving the reliability of the cover plate.

[0024] Alternatively, if Figure 1As shown, the surfaces of the two substrate layers 100 facing the optical adhesive layer 200 are both provided with a desorption structure 300. In this way, by providing the desorption structure on the surfaces of the two substrate layers 100, the adhesion between the optical adhesive layer 200 and the edge of any one of the two substrate layers 100 can be reduced, thereby further reducing the adhesive pulling phenomenon of the optical adhesive layer 200 and improving the reliability of the cover plate.

[0025] Of course, the cover plate provided in the embodiment of the present invention may also have a desorption structure on one of the substrate layers, while not having a desorption structure on the other substrate layer. In this way, the structural complexity of the cover plate can be reduced, the manufacturing process of the cover plate can be simplified, and the manufacturing cost of the cover plate can be reduced.

[0026] Alternatively, if Figure 1 As shown, the desorption structures 300 provided on the two substrate layers 100 have the same shape, and the orthographic projections of the desorption structures 300 provided on the two substrate layers 100 overlap each other on the substrate layers 100. In this way, by providing the same desorption structure on the two substrate layers 100, the manufacturing process of the cover plate can be simplified and the manufacturing cost of the cover plate can be reduced.

[0027] Of course, the desorption structures provided on the two substrate layers may also be different, so that a cover plate with a variety of structures can be manufactured, thereby improving the flexibility of the cover plate design.

[0028] Alternatively, if Figure 1 As shown, the desorption structure 300 completely covers the portion of the substrate layer 100 extending out of the edge of the optical adhesive layer 200. In this way, when the optical adhesive layer 200 is strongly squeezed, resulting in a large expansion of the optical adhesive layer 200 toward the substrate layer 100, the optical adhesive layer 200 will still contact the desorption structure 300, thereby reducing the adhesive pulling phenomenon of the optical adhesive layer 200 through the high water drop angle of the desorption structure 300, thereby improving the reliability of the cover plate.

[0029] Of course, the desorption structure may also only cover the portion of the substrate layer 100 extending out of the edge of the optical adhesive layer 200 , which is not specifically limited here.

[0030] The desorption structures of different forms are introduced below.

[0031] 1. Hydrophobic layer.

[0032] like Figure 1 As shown, the desorption structure 300 includes: a hydrophobic layer 301 disposed on the surface of the substrate layer 100 facing the optical adhesive layer 200. The hydrophobic layer 301 can be made by, but not limited to, spraying, scraping, sputtering, etc., and the material of the hydrophobic layer 301 includes, but is not limited to, polytetrafluoroethylene, perfluoropolyether, silicone oil, organic silicon material, aliphatic polyurethane acrylate and other hydrophobic materials.

[0033] In this way, by providing a hydrophobic layer and utilizing the higher water drop angle of the hydrophobic layer, the adhesion between the optical adhesive layer and the edge of the substrate layer is reduced, thereby reducing the degree of pulling of the optical adhesive layer on the edge of the substrate layer after extrusion and unloading, that is, reducing the adhesive pulling phenomenon of the optical adhesive layer and improving the reliability of the cover.

[0034] Optionally, the thickness of the hydrophobic layer may be, but is not limited to, less than 100 nm. In this way, it is possible to avoid the difficulty in manufacturing the cover plate due to the hydrophobic layer being too thick, and manufacturing a thinner hydrophobic layer can reduce the manufacturing cost of the cover plate. Of course, the thickness of the hydrophobic layer can be selected according to actual needs, for example, the thickness of the hydrophobic layer is less than 300 nm, and the thickness of the hydrophobic layer is not specifically limited here.

[0035] Alternatively, if Figure 3 As shown, the cover plate further includes a first ink layer 400, and the first ink layer 400 is located between the substrate layer 100 and the hydrophobic layer 301. In this way, by providing the first ink layer 400, since the first ink layer 400 has a light shielding effect, it can cover the edge of the cover plate, so that the user cannot observe the internal structure of the display device from the outside of the display device, thereby improving the aesthetics of the display device. In addition, since the hydrophobic layer 301 is located on the side of the first ink layer 400 away from the substrate layer 100, the hydrophobic layer 301 can reduce the adhesion between the optical adhesive layer and the edge of the substrate layer, thereby improving the reliability of the cover plate.

[0036] Of course, when the adhesion between the hydrophobic layer and the substrate layer is poor, the desorption structure may further include a buffer layer, which is disposed between the hydrophobic layer and the substrate layer, so that the buffer layer has good adhesion to both the substrate layer and the hydrophobic layer, thereby improving the structural stability of the cover plate. Wherein, when the buffer layer is provided, the thickness of the desorption structure may be set to be not less than 10 nm and not more than 5 μm, and the material of the buffer layer may be selected according to the materials of the substrate layer and the hydrophobic layer, and is not limited here.

[0037] In addition, the hydrophobic layer can be set to be transparent or non-transparent. When the hydrophobic layer is transparent, a first ink layer can be set between the buffer layer and the substrate layer, or between the buffer layer and the hydrophobic layer to improve the aesthetics of the display device; or, when the hydrophobic layer is non-transparent, the hydrophobic layer can prevent the user from observing the internal structure of the display device from the outside of the display device, thereby improving the aesthetics of the display device, and there is no need to additionally set a first ink layer, which simplifies the manufacturing process of the cover plate.

[0038] 2. Microstructure.

[0039] like Figure 4As shown, the desorption structure 300 includes: a microstructure 302 disposed on the surface of the substrate layer 100 facing the optical adhesive layer 200. In this way, by providing the microstructure 302, when the optical adhesive layer 200 contacts the edge of the substrate layer 100 due to expansion, the contact area between the substrate layer 100 and the optical adhesive layer 200 at the location where the microstructure 302 is provided is reduced, and the water drop angle of the substrate layer 100 at the location where the microstructure 302 is provided is increased, thereby reducing the adhesion between the optical adhesive layer 200 and the edge of the substrate layer 100, reducing the adhesive pulling phenomenon of the optical adhesive layer 200, and improving the reliability of the cover plate.

[0040] In addition, the desorption structure formed by the microstructure does not require the provision of an additional film layer, and removes part of the material in the original film layer, which can reduce the weight of the cover plate and further reduce the weight of the display device.

[0041] Alternatively, if Figure 4 As shown, the microstructure 302 is sawtooth-shaped, and the sawtooth extends along the edge of the substrate layer. In this way, when the optical adhesive layer 200 contacts the edge of the substrate layer 100 due to expansion, the sawtooth-shaped microstructure 302 contacts the optical adhesive layer 200 through multiple edges, which greatly reduces the contact area between the substrate layer 100 and the optical adhesive layer 200 where the microstructure 302 is set, thereby greatly improving the water drop angle of the substrate layer 100 where the microstructure 302 is set, reducing the adhesive pulling phenomenon of the optical adhesive layer 200, and improving the reliability of the cover plate.

[0042] Optionally, when the microstructure is sawtooth-shaped, the spacing between adjacent sawtooth is less than 200nm, and the sawtooth height is less than 1μm. In this way, by setting a smaller sawtooth spacing, when the optical adhesive layer contacts the edge of the substrate layer due to expansion, the intrusion of the optical adhesive layer into the sawtooth space can be reduced, thereby further reducing the contact area between the substrate layer and the optical adhesive layer where the microstructure is set, reducing the adhesive pulling phenomenon of the optical adhesive layer, and improving the reliability of the cover plate; by setting a smaller sawtooth height, the difficulty of manufacturing the sawtooth microstructure is reduced, thereby reducing the manufacturing cost of the cover plate.

[0043] Of course, the specific morphology of the microstructure is not limited to the sawtooth shape. For example, the microstructure can also be set to a cone shape arranged in an array. When the microstructure obtained thereby contacts the optical adhesive layer, the cone shape can achieve a smaller contact area than the sawtooth shape, thereby further reducing the adhesive pulling phenomenon of the optical adhesive layer and improving the reliability of the cover plate. Alternatively, the microstructure can also be set to have a morphology with multiple nano- or micron-sized pits, and the size and shape of each pit can be the same or different. The microstructure obtained thereby has a simple manufacturing process and can reduce the manufacturing cost of the cover plate. In addition to the above content, the microstructure can also be a morphology that can reduce the contact area between the substrate layer where the microstructure is provided and the optical adhesive layer. The specific selection can be made according to actual conditions and is not limited here.

[0044] 3. Second ink layer.

[0045] like Figure 5 As shown, the desorption structure 300 includes: a second ink layer 303 disposed on the surface of the substrate layer 100 facing the optical adhesive layer 200. In this way, by providing the second ink layer 303 with a higher water drop angle, the adhesion between the edge of the optical adhesive layer and the substrate layer can be reduced, and the adhesive pulling phenomenon of the optical adhesive layer can be alleviated, thereby improving the reliability of the cover plate, and the user can not observe the internal structure of the display device from the outside of the display device, thereby improving the aesthetics of the display device, that is, by providing the second ink layer 303, the cover plate can achieve improved reliability and aesthetics with a simple structure.

[0046] It should be understood that the second ink layer is different from the first ink layer described above. The second ink layer is an ink layer with a higher water drop angle, while the first ink layer has no water drop angle requirement due to the hydrophobic layer disposed thereon.

[0047] Alternatively, if Figure 5 As shown, the orthographic projection of the desorption structure 300 on the substrate layer 100 overlaps with the orthographic projection of the optical adhesive layer 200 on the substrate layer 100. In this way, since the desorption structure 300 can overlap with the optical adhesive layer 200, when the desorption structure 300 is set, the requirements for the alignment accuracy of the desorption structure 300 can be reduced, thereby reducing the difficulty of manufacturing the cover plate.

[0048] Of course, when the orthographic projection of the desorption structure on the substrate layer and the orthographic projection of the optical adhesive layer on the substrate layer overlap with each other, in order not to affect the adhesion of the optical adhesive layer to the two substrate layers, the proportion of the overlapping area to the area of ​​the optical adhesive layer should not be too large. The proportion of the overlapping area to the area of ​​the optical adhesive layer can be set according to actual needs and is not specifically limited here.

[0049] Optionally, the spacing between the desorption structure and the optical interlayer can be in the range of greater than -b and less than a, wherein a and b are both positive integers, and a negative spacing between the desorption structure and the optical interlayer indicates that the two overlap with each other. The specific values ​​of a and b can be set according to the size of the cover plate, and are not specifically limited here. In this way, the requirements for the positioning accuracy of the desorption structure can be further reduced, thereby further reducing the difficulty of manufacturing the cover plate.

[0050] Based on the same inventive concept, an embodiment of the present invention further provides a display device, the implementation principle of the display device is similar to the implementation principle of the aforementioned cover plate for the display panel. The specific implementation method of the display device can refer to the aforementioned embodiment of the cover plate for the display panel, and the repeated parts will not be repeated.

[0051] Specifically, an embodiment of the present invention provides a display device, such as Figure 6 As shown, it includes: a display panel 601, and a cover plate 602 as described above and located on the light emitting surface of the display panel 601.

[0052] Among them, the display device can be a flexible display device. When the flexible display device is bent, the cover plate will also bend, so that the optical adhesive layer in the cover plate will be squeezed. Since a desorption structure is provided in the cover plate, the adhesion between the optical adhesive layer and the edge of the substrate layer is reduced, thereby reducing the degree of pulling of the optical adhesive layer on the edge of the substrate layer after squeezing and unloading, that is, reducing the glue pulling phenomenon of the optical adhesive layer, and improving the reliability of the cover plate.

[0053] Of course, the display device may also be a non-flexible display device. For non-flexible display devices, when making the cover plate, the optical adhesive layer will be squeezed during the bonding process of the two substrate layers. Similarly, since a desorption structure is provided in the cover plate, the adhesive pulling phenomenon of the optical adhesive layer is reduced, thereby improving the reliability of the cover plate.

[0054] Therefore, the display device may be a display device with a cover plate that is well known to those skilled in the art, and is not specifically limited here.

[0055] It should be understood that the above content only introduces part of the structure of the display device, such as Figure 7 As shown, the display device may further include: a polarizer 603 located between the display panel 601 and the cover plate 602, a support layer 604 located on the side of the display panel 601 away from the cover plate 602, and other structures. The specific structure of the display panel may be selected according to a method familiar to those skilled in the art and is not specifically limited here.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cover plate for a display panel, characterized in that: include: Two stacked substrate layers, an optical adhesive layer located between the two substrate layers, and an edge of the substrate layer extending beyond an edge of the optical adhesive layer; At least one of the two substrate layers is provided with a desorption structure, and the desorption structure is located at: a portion of the substrate layer that faces the surface of the optical adhesive layer and extends out of the optical adhesive layer, and a water drop angle of the desorption structure is greater than or equal to 90°.

2. The cover plate according to claim 1, characterized in that: The desorption structure includes: a hydrophobic layer disposed on a surface of the substrate layer facing the optical adhesive layer.

3. The cover plate according to claim 2, characterized in that: The cover plate further includes a first ink layer, wherein the first ink layer is located between the substrate layer and the hydrophobic layer.

4. The cover plate according to claim 2, characterized in that: The thickness of the hydrophobic layer is less than 100 nm.

5. The cover plate according to claim 1, characterized in that: The desorption structure includes: a microstructure arranged on the surface of the substrate layer facing the optical adhesive layer.

6. The cover plate according to claim 5, characterized in that: The microstructure is in a sawtooth shape, and the sawtooth extends along the edge of the substrate layer.

7. The cover plate according to claim 6, characterized in that: The distance between adjacent saw teeth is less than 200 nm, and the height of the saw teeth is less than 1 μm.

8. The cover plate according to claim 1, characterized in that: The desorption structure includes: a second ink layer disposed on a surface of the substrate layer facing the optical adhesive layer.

9. The cover plate according to claim 1, characterized in that: The desorption structure is disposed on the surfaces of the two substrate layers facing the optical adhesive layer.

10. The cover plate according to claim 9, characterized in that: The desorption structures arranged on the two substrate layers have the same morphology, and the orthographic projections of the desorption structures arranged on the two substrate layers on the substrate layers overlap with each other.

11. The cover plate according to claim 1, characterized in that: The desorption structure completely covers the portion of the substrate layer extending beyond the edge of the optical adhesive layer.

12. The cover plate according to any one of claims 1 to 11, characterized in that: The orthographic projection of the desorption structure on the substrate layer overlaps with the orthographic projection of the optical adhesive layer on the substrate layer.

13. A display device, characterized in that: include: A display panel, and a cover plate as claimed in any one of claims 1 to 12 located on a light emitting surface of the display panel.

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