Cover plate and display panel

Abstract

The application discloses a cover plate and a display panel. The cover plate comprises a first surface, a second surface neutral layer and a plurality of reinforcing parts. The first surface and the second surface are oppositely arranged. The neutral layer is located between the first surface and the second surface, and the distance from the first surface and the second surface to the neutral layer is the same. The plurality of reinforcing parts comprises a first reinforcing part and two second reinforcing parts. The first reinforcing part extends from the second surface to the first surface along a first direction, and extends along a second direction and passes through the center of the second surface. The second reinforcing part extends from the first surface or the second surface to at least the neutral layer along the first direction. The orthographic projection of the two second reinforcing parts on the second surface is symmetrical about the orthographic projection of the first reinforcing part on the second surface. The above scheme can reduce the probability of cover plate rupture and deformation, and improve the anti-falling ability of the cover plate and the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a cover plate and a display panel. Background Technology

[0002] Users have increasingly higher requirements for display devices, and drop resistance is one of the important indicators. However, as the thickness of related cover plates becomes thinner, display devices suffer from insufficient cover plate strength, deformation, and cracking after being dropped.

[0003] The cover glass of related display devices is usually made of tempered glass to increase its strength. Tempered glass changes the chemical composition of the glass surface, forming a compressive stress layer on its surface and a tensile stress layer inside. The tensile stress layer inside reduces the internal strength of the product and affects its impact resistance. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a cover plate and display panel that improves drop resistance.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a cover plate, the cover plate including a first surface, a second surface neutral layer and a plurality of reinforcing parts; the first surface and the second surface are disposed opposite to each other; the neutral layer is located between the first surface and the second surface, and the distance from the first surface and the second surface to the neutral layer is the same; the plurality of reinforcing parts include one first reinforcing part and two second reinforcing parts; wherein, the first reinforcing part extends from the second surface to the first surface along a first direction, and extends along a second direction and passes through the center of the second surface, the second reinforcing parts extend from the first surface or the second surface along the first direction to at least the neutral layer, and the orthographic projections of the two second reinforcing parts on the second surface are symmetrical about the orthographic projection of the first reinforcing part on the second surface.

[0006] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a display panel, including the cover plate in any embodiment.

[0007] The beneficial effects of this application are as follows: When the cover plate is dropped and subjected to pressure, the center of the second surface away from the pressure side and the neutral layer inside the cover plate generate large tensile stress, which easily leads to cracking. Therefore, unlike the situation in related technologies, the cover plate of this application is reinforced in sections to form multiple reinforcing parts. Among them, the center of the second surface is reinforced to form a first reinforcing part, and the neutral layer is reinforced to form a second reinforcing part. The compressive stress formed in the reinforcing parts can neutralize the tensile stress generated when the cover plate is dropped and subjected to pressure, thereby reducing the probability of the cover plate cracking and deformation, and improving the drop resistance of the cover plate and the display panel. Attached Figure Description

[0008] Figure 1 This is a diagram of the internal principal stress traces of the cover plate during the fall of this application;

[0009] Figure 2 This is a structural schematic diagram of one embodiment of the cover plate of this application;

[0010] Figure 3 yes Figure 2 A bottom view;

[0011] Figure 4 This is a schematic diagram of another embodiment of the cover plate of this application;

[0012] Figure 5 This is a schematic diagram of another embodiment of the cover plate of this application;

[0013] Figure 6 This is a bottom view of another embodiment of the cover plate of this application;

[0014] Figure 7 This is a schematic diagram of another embodiment of the cover plate of this application;

[0015] Figure 8 This is a bottom view of another embodiment of the cover plate of this application;

[0016] Figure 9 This is a schematic diagram of another embodiment of the cover plate of this application;

[0017] Figure 10 This is a schematic diagram of another embodiment of the cover plate of this application;

[0018] Figure 11 This is a flowchart illustrating one embodiment of the method for strengthening the cover plate according to this application;

[0019] Figure 12 This is a structural schematic diagram of the cover plate reinforcement in this application.

[0020] In the figure: A-principal tensile stress trace, B-principal compressive stress trace, 1-cover plate, 1a-first surface, 1b-second surface, 1c-neutral layer, 1d-first edge, 1e-second edge, 11-first reinforcing part, 12-second reinforcing part, 13-third reinforcing part, 14-fourth reinforcing part, 2-support member, 3-mold, 31-through hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Cover plate 1 is located on the outermost layer of the display panel, and cover plate 1 has a first surface 1a and a second surface 1b disposed opposite to each other. (See reference...) Figure 1 , Figure 1 This is a diagram showing the internal principal stress traces of the cover plate 1 when it is dropped. Specifically, the first surface 1a and the second surface 1b are parallel. The first surface 1a is the outer surface of the cover plate 1, and the second surface 1b is the inner surface of the cover plate 1. When the first surface 1a faces downwards, the second surface 1b faces upwards. When the cover plate 1 is dropped, the first surface 1a is the pressure-bearing surface of the cover plate 1, and the second surface 1b is the supporting surface of the cover plate 1. Both ends of the second surface 1b are supported on other structures of the display panel by support members 2. The cover plate 1 also includes a neutral layer 1c located between the first surface 1a and the second surface 1b. The distances from the first surface 1a and the second surface 1b to the neutral layer 1c are the same. On the neutral layer 1c, the cover plate 1 is subjected to neither tensile nor compressive forces, and the cover plate 1 will not deform.

[0023] The inventors discovered through research that when the cover plate 1 is dropped face down, its first surface 1a is subjected to pressure from the dropping surface (e.g., the ground), and this pressure can be considered as a uniformly distributed load q applied vertically to the first surface 1a. When the first surface 1a of the cover plate 1 is subjected to a uniformly distributed load q, and the two ends of the second surface 1b are supported, its internal principal stress trace is as follows: Figure 1 As shown, the principal stress traces include principal tensile stress trace A (shown as a solid line in the figure) and principal compressive stress trace B (shown as a dashed line in the figure). Principal tensile stress trace A is the line connecting the tangents of the maximum tensile stress (i.e., principal tensile stress) in each cross-section inside the cover plate 1. That is, the tangent direction at any point on principal tensile stress trace A is the direction of the principal tensile stress at that point. As can be seen from the figure, principal tensile stress trace A is an arc convex towards the first surface 1a, with its two ends intersecting the second surface 1b at the support points of the second surface 1b. Principal tensile stress trace A has an axisymmetric structure. Principal compressive stress trace B is the line connecting the tangents of the maximum compressive stress (i.e., principal compressive stress) in each cross-section inside the cover plate 1. That is, the tangent direction at any point on principal compressive stress trace B is the direction of the principal compressive stress at that point. Principal compressive stress trace B is symmetrical to principal tensile stress trace A about the neutral layer 1c and is an arc convex towards the second surface 1b.

[0024] The shape of the principal stress trace is related to the magnitude of the uniformly distributed load q on the first surface 1a, and the position of the intersection point of the principal stress trace and the neutral layer 1c is also related to the magnitude of the uniformly distributed load q, but the angle between the principal stress trace and the neutral layer 1c is fixed at 45°. The inventors also discovered that the midpoint A1 on the principal tensile stress trace A, and the intersection points A2 and A3 of the principal tensile stress trace A and the neutral layer 1c are most prone to deformation and cracking. Point A1 is the point on the principal tensile stress trace A closest to the second surface 1b, and the direction of the principal tensile stress at this point is parallel to the second surface 1b, i.e., along... Figure 1 In the X direction and its opposite direction, points A2 and A3 are located in the middle of cover plate 1 in the first direction (i.e., the Z direction in the figure, the thickness direction of cover plate 1). The principal tensile stress direction at these two points forms a 45° angle with the neutral layer 1c. The positions of points A2 and A3 are not fixed and are related to the magnitude of the uniformly distributed load q. They are located between point A1 and the endpoint of the principal tensile stress trace A. The specific positions of points A2 and A3 can be determined by simulating the range of the uniformly distributed load that cover plate 1 actually experiences when it is dropped, so as to determine the possible range of points A2 and A3, and determine the reinforcement points of cover plate 1 based on this range.

[0025] See Figure 2 , Figure 2 This is a structural schematic diagram of one embodiment of the cover plate 1 of this application. Figure 3 yes Figure 2 The figure shows a bottom view. The thickness direction of the cover plate 1 is the first direction (Z direction in the figure), the width direction is the second direction (Y direction in the figure), and the length direction is the third direction (X direction in the figure). To improve the impact resistance of the cover plate 1, the cover plate 1 of this application further includes multiple reinforcing parts, including a first reinforcing part 11 and two second reinforcing parts 12. The first reinforcing part 11 extends from the second surface 1b to the first surface 1a along the first direction, and extends along the second direction and passes through the center of the second surface 1b. The center of the second surface 1b can be understood as the geometric center. When the second surface 1b is rectangular, the first reinforcing part 11 extends along the axis of symmetry of the long side of the rectangle. The second reinforcing parts 12 extend from the second surface 1b to the neutral layer 1c along the first direction and extend along the second direction. The orthographic projections of the two second reinforcing parts 12 on the second surface 1b are symmetrical about the orthographic projection of the first reinforcing part 11 on the second surface 1b. In this embodiment, the ends of the first reinforcing part 11 and the second reinforcing part 12 are both a certain distance from the edge of the cover plate 1, and the length of the first reinforcing part 11 and the second reinforcing part 12 is not limited in this application.

[0026] The cover plate 1 of this application undergoes zoned reinforcement treatment in the areas prone to deformation and cracking, forming multiple reinforced sections. Specifically, point A1 is reinforced to form a first reinforced section 11, and points A2 and A3 are reinforced to form two second reinforced sections 12. The reinforced sections of the cover plate 1 generate compressive stress, which neutralizes the tensile stress generated when the cover plate 1 is subjected to pressure during a drop, thereby reducing the probability of breakage and deformation of the cover plate 1 and improving the drop resistance of the cover plate 1 and the display panel. Specifically, the reinforcement treatment of the cover plate 1 can be achieved by impregnating the surface of the cover plate 1 with a chemical strengthening solution such as KNO3, and then placing the cover plate 1 in a tempering furnace. Under high temperature, the KNO3 solution... + Ions and Na in cover plate 1 + After displacement occurs, residual compressive stress is generated inside the cover plate 1, thereby strengthening it. Its strength can reach 700 MPa, far exceeding the strength of the unstrengthened version (approximately 50 MPa). Since the solution is in contact with the surface of the cover plate 1, the strengthening portion typically extends from the surface of the cover plate 1 inwards. In this embodiment, the first strengthening portion 11 extends from the second surface 1b into the cover plate 1, meaning the strengthening solution contacts the axis of symmetry of the long side of the second surface 1b and gradually strengthens it inwards. Because the second surface 1b is closer to point A1 than the first surface 1a, a shorter strengthening time is required to reach point A1 from the second surface 1b. Furthermore, in this embodiment, the first strengthening portion 11 does not overlap with the principal compressive stress trace B, thus preventing excessive compressive stress inside the cover plate 1. Specifically, the thickness of the first strengthening portion 11 in the first direction is greater than or equal to 50 μm, allowing the compressive stress layer in the first strengthening portion 11 to extend from the first surface 1a and cover point A1, ensuring the impact resistance of the cover plate 1. In this embodiment, the second reinforcing portion 12 extends inward from the second surface 1b to the neutral layer 1c; therefore, the second reinforcing portion 12 can be fabricated simultaneously with the first reinforcing portion 11. In other embodiments, the second reinforcing portion 12 may also extend inward from the first surface 1a to the neutral layer 1c, such as... Figure 4 As shown; or the second reinforcing part 12 may extend inward from the first surface 1a or the second surface 1b and beyond the neutral layer 1c, as shown. Figure 5 As shown, both the first reinforcing part 11 and the second reinforcing part 12 extend inward from the second surface 1b, and the second reinforcing part 12 extends beyond the neutral layer 1c.

[0027] Optionally, see Figure 6 , Figure 6This is a bottom view of another embodiment of the cover plate 1 of this application. In this embodiment, each reinforcing part (i.e., one first reinforcing part 11 and two second reinforcing parts 12) extends from one edge to the other edge of the cover plate 1 along a second direction. Specifically, the cover plate 1 includes a first edge 1d and a second edge 1e, and multiple reinforcing parts extend from the first edge 1d to the second edge 1e. The above arrangement allows the reinforcing parts to cover the points to be reinforced (e.g., points A1, A2, and A3) on any cross section perpendicular to the second direction. Optionally, multiple reinforcing parts extend along the second direction, which is the width direction of the cover plate 1. That is, multiple reinforcing parts extend along the width direction of the cover plate 1. Since the length of the cover plate 1 in the third direction is greater than its length in the second direction, when the first surface is compressed and the two ends of the cover plate 1 in the third direction are supported, the principal tensile stress trace A and the principal compressive stress trace B on the plane where XZ are located are more consistent. Figure 1 As shown in the curve, the reinforcing portion extending along the second direction can better cover the point on the principal tensile stress trace A, thereby ensuring improved impact resistance of the cover plate 1.

[0028] See Figure 7 , Figure 7 This is a schematic diagram of another embodiment of the cover plate 1 of this application. In this embodiment, the cover plate 1 further includes a third reinforcing part 13, located between the first reinforcing part 11 and the second reinforcing part 12. The third reinforcing part 13 extends from the second surface 1b to the first surface 1a along a first direction and extends along a second direction. The thickness of the third reinforcing part 13 is greater than the thickness of the first reinforcing part 11 and less than the thickness of the second reinforcing part 12. Specifically, since the principal tensile stress trace A is an arc protruding towards the second surface 1b, the third reinforcing part 13 can extend inward from the second surface 1b to the principal tensile stress trace A. The inventors discovered that, in addition to points A1, A2, and A3, when the first surface 1a is compressed, points on the portion of the principal tensile stress trace A between the second surface 1b and the neutral layer 1c are also more prone to deformation and cracking. Therefore, the third reinforcing part 13 between the first reinforcing part 11 and the second reinforcing part 12 can further strengthen the cover plate 1 and improve its impact resistance. The number of third reinforcing portions 13 can be any even number, and this application does not impose any limitation. In other embodiments, the third reinforcing portions 13 may also extend inward from the second surface 1b and beyond the principal tensile stress trace A.

[0029] Optionally, please continue reading Figure 7 and combined Figure 8In this embodiment, there are four third reinforcing parts 13. The orthographic projections of the four third reinforcing parts 13 on the second surface 1b are distributed on both sides of the orthographic projection of the first reinforcing part 11 on the second surface 1b. That is, two third reinforcing parts 13 are provided on each side of the first reinforcing part 11, and the orthographic projections of the four third reinforcing parts 13 on the second surface 1b are symmetrical about the orthographic projection of the first reinforcing part 11 on the second surface 1b. The above arrangement makes the orthographic projections of the multiple reinforcing parts on the second surface 1b symmetrical about the orthographic projection of the first reinforcing part 11 on the second surface 1b, so that the compressive stress layers formed in the cover plate 1 are all symmetrical structures. Optionally, along the direction from the first reinforcing part 11 to the second reinforcing part 12 (X direction and its opposite direction in the figure), the thickness of the multiple third reinforcing parts 13 gradually increases. The above arrangement makes the thickness of the multiple reinforcing parts gradually increase from the center of the cover plate 1 to both sides along the third direction, which conforms to the direction of the principal tensile stress trace A near the second surface 1b and covers the principal tensile stress trace A, and also avoids the reinforcing parts covering the principal compressive stress trace B. Furthermore, a plurality of third reinforcing parts 13 are evenly distributed in the third direction between the first reinforcing part 11 and the second reinforcing part 12. This ensures that the compressive stress layer formed in the cover plate 1 is evenly distributed, thereby uniformly improving the impact resistance.

[0030] See Figure 9 , Figure 9 This is a schematic diagram of another embodiment of the cover plate 1 of this application. In this embodiment, the cover plate 1 includes a fourth reinforcing part 14, located on the side of the second reinforcing part 12 away from the first reinforcing part 11. The fourth reinforcing part 14 extends from the first surface 1a to the second surface 1b along a first direction and also extends along a second direction. The thickness of the fourth reinforcing part 14 is less than the thickness of the second reinforcing part 12. Specifically, since the two ends of the principal tensile stress trace A are located on the first surface 1a, the fourth reinforcing part 14 can extend inward from the first surface 1a to the principal tensile stress trace A with a shorter distance. The inventors have found that when the first surface 1a is compressed, the points at the ends of the principal tensile stress trace A between the first surface 1a and the neutral layer 1c are also more prone to deformation and cracking. Therefore, the fourth reinforcing part 14 outside the second reinforcing part 12 can further strengthen the cover plate 1 and improve its impact resistance. The number of fourth reinforcing parts 14 can be any even number; the specific number is not limited in this application. In other embodiments, the fourth reinforcing portion 14 may also extend inward from the first surface 1a and beyond the principal tensile stress trace A.

[0031] Optionally, please continue reading Figure 9In this embodiment, there are two fourth reinforcing parts 14. The two fourth reinforcing parts 14 are located on the side of each second reinforcing part 12 away from the first reinforcing part 11. The orthographic projections of the two fourth reinforcing parts 14 on the second surface 1b are symmetrical about the orthographic projection of the first reinforcing part on the second surface 1b. The above arrangement ensures that the orthographic projections of the multiple reinforcing parts on the second surface 1b are all symmetrical about the orthographic projection of the first reinforcing part 11 on the second surface 1b, so that the compressive stress layers formed in the cover plate 1 are all symmetrical structures.

[0032] Optionally, see Figure 10 Each second reinforcing part 12 has two fourth reinforcing parts 14 on the side facing away from the first reinforcing part 11. The thickness of the fourth reinforcing parts 14 gradually decreases along the direction from which the second reinforcing part 12 faces away from the first reinforcing part 11. This arrangement ensures that the ends of the multiple reinforcing parts facing away from the first surface 1a conform to and cover the principal tensile stress trace A, while also preventing the reinforcing parts from covering the principal compressive stress trace B. Furthermore, multiple third reinforcing parts 13 on one side of the second reinforcing part 12 are evenly distributed in the X direction. This ensures that the compressive stress layer formed in the cover plate 1 is evenly distributed, uniformly improving the impact resistance. Specifically, the width of the orthographic projection of the multiple reinforcing parts onto the first surface 1a (…) Figure 10 The width is denoted as d) greater than or equal to 3mm. Further, the width is less than or equal to 15mm, such as 5mm, 10mm, etc. This width facilitates the partitioning and reinforcement of the surface of the cover plate 1. Optionally, the widths of the multiple reinforcing parts are all the same. Further, the multiple reinforcing parts are sequentially connected in a third direction on the first surface 1a and do not overlap each other, so that the principal tensile stress trace A is covered by the reinforcing parts, thereby further improving the strength of the cover plate 1.

[0033] See Figure 11 and Figure 12 The cover plate 1 provided in this application can be manufactured according to the following steps:

[0034] Step S101: As Figure 12 As shown, three molds 3 are placed on the second surface 1b of the glass cover plate 1 to be strengthened. The molds 3 are used to contain chemical strengthening solutions, such as KNO3 solution, and are provided with through holes 31 so that the chemical strengthening solution can wet the second surface 1b. The through holes should correspond one-to-one with the first strengthening part 11 and the second strengthening part 12. For example, in this embodiment, the width of the through hole in the X direction is 10 mm, and the length is the same as the length of the cover plate 1 in the Y direction.

[0035] Step S102: Fill the mold 2 with chemical strengthening solution, and place the cover plate 1 containing the mold 3 into the tempering furnace and strengthen it at high temperature.

[0036] Step S103: After a first preset time t1, the mold corresponding to the first reinforced part 11 and the chemical reinforcing solution therein are removed; after a second preset time t2, the mold corresponding to the second reinforced part 12 and the chemical reinforcing solution therein are removed, where t1 < t2. That is, the reinforcing time of the first reinforced part 11 is less than the reinforcing time of the second reinforced part 12, thereby achieving a thickness of the first reinforced part 11 that is less than the thickness of the second reinforced part 12.

[0037] In other embodiments, the mold can be set according to the number of reinforcing parts, and the reinforcing time can be set according to the thickness of the reinforcing parts. The thicker the reinforcing parts, the longer the reinforcing time.

[0038] This application also provides a display panel, including the cover plate 1 in any embodiment. This display panel can be used in display devices such as mobile phones and wearable devices.

[0039] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A cover plate, characterized in that The cover plate includes: First surface; The second surface is disposed opposite to the first surface and the second surface; A neutral layer, located between the first surface and the second surface, wherein the distances from the first surface and the second surface to the neutral layer are the same; the cover plate further includes: Multiple reinforcing sections, wherein the multiple reinforcing sections include one first reinforcing section and two second reinforcing sections; wherein, The first reinforcing portion extends from the second surface toward the first surface along a first direction and extends along a second direction and passes through the center of the second surface. The second reinforcing portion extends from the first surface or the second surface along the first direction to at least the neutral layer and extends along the second direction. The orthographic projections of the two second reinforcing portions on the second surface are symmetrical about the orthographic projection of the first reinforcing portion on the second surface. The reinforcing portion reaches the principal tensile stress trace generated inside the cover plate when it is dropped and subjected to pressure.

2. The cover plate according to claim 1, characterized in that, The plurality of reinforcing portions further includes a third reinforcing portion located between the first reinforcing portion and the second reinforcing portion. The third reinforcing portion extends from the second surface to the first surface along the first direction and extends along the second direction, wherein the thickness of the third reinforcing portion in the first direction is greater than the thickness of the first reinforcing portion in the first direction and less than the thickness of the second reinforcing portion.

3. The cover plate according to claim 2, characterized in that, The number of the third reinforcing parts is even, and the orthographic projections of the third reinforcing parts on the second surface are distributed on both sides of the orthographic projections of the first reinforcing parts on the second surface, and are symmetrical about the orthographic projections of the first reinforcing parts on the second surface.

4. The cover plate according to claim 3, characterized in that, The number of the third reinforcing parts is even. Multiple projections of the third reinforcing parts on the second surface are distributed between the orthographic projection of the first reinforcing part on the second surface and the orthographic projection of each second reinforcing part on the second surface. The thickness of the multiple third reinforcing parts gradually increases along the direction from the first reinforcing part to the second reinforcing part.

5. The cover plate according to claim 1, characterized in that, The plurality of reinforcing portions further includes a fourth reinforcing portion, which is located on the side of the second reinforcing portion away from the first reinforcing portion. The fourth reinforcing portion extends from the first surface to the second surface along the first direction and also extends along the second direction. The thickness of the fourth reinforcing portion is less than the thickness of the second reinforcing portion.

6. The cover plate according to claim 5, characterized in that, The number of the fourth reinforcing parts is even, and the fourth reinforcing parts are respectively located on the side of each second reinforcing part away from the first reinforcing part. The orthographic projection of the fourth reinforcing part on the second surface is symmetrical about the orthographic projection of the first reinforcing part on the second surface.

7. The cover plate according to claim 5, characterized in that, Each of the second reinforcing portions has at least one fourth reinforcing portion on the side away from the first reinforcing portion. When there are multiple fourth reinforcing portions, the thickness of the multiple fourth reinforcing portions gradually decreases along the direction in which the second reinforcing portion is away from the first reinforcing portion.

8. The cover plate according to claim 1, characterized in that, The thickness of the reinforced portion in the first direction is greater than or equal to 50 μm; and / or, The width of the reinforced part projected onto the second surface is greater than or equal to 3 mm.

9. The cover plate according to claim 1, characterized in that, Each of the reinforcing portions extends from one edge of the cover plate to the other edge along the second direction.

10. A display panel, characterized by, The cover plate included in any one of claims 1-9.

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