Cover plate and display module

Abstract

This disclosure provides a cover plate and a display module. The cover plate body includes a first main surface, a second main surface, and a side surface. The second main surface includes a light leakage critical region located at the edge. The side surface includes a first sub-side surface and a second sub-side surface. The first sub-side surface is connected to the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface onto the surface where the first main surface is located is outside the first main surface. The orthographic projection of the second sub-side surface onto the surface where the first sub-side surface is located is outside the first sub-side surface. The angle between the surface perpendicular to the first main surface and the second sub-side surface at the boundary of the second sub-side surface and the second sub-side surface is a first angle. The angle between the surface defined by the boundary between the edge of the light leakage critical region away from the side surface and the second sub-side surface and the first main surface, and the surface perpendicular to the first main surface at the boundary of the second sub-side surface and the first main surface, is a second angle. The difference between 90 degrees and the second angle is less than the first angle.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a cover plate and a display module. Background Technology

[0002] With the development of electronic device technology, the technical requirements for display modules, such as strength, airtightness, and light-shielding, are becoming increasingly stringent. In the field of electronic devices, these technical requirements are mainly achieved through strengthening and thickening the cover glass and screen printing inks. During the cover glass manufacturing process, as the cover glass thickness increases and process limitations arise, the difficulty of designing anti-light leakage at the edges of the cover glass increases, leading to edge light transmission issues. This, in turn, affects the overall appearance quality of the module after the cover glass is fully laminated into it. Utility Model Content

[0003] This disclosure provides a cover plate, comprising a cover plate body, the cover plate body including a first main surface, a second main surface, and a side surface, the first main surface and the second main surface being opposite each other and their edge regions being parallel to each other, and the side surface being located between and in contact with the first main surface and the second main surface. The second main surface includes a light leakage critical region located at the edge of the second main surface and in contact with the side surface, the side surface including a first sub-side surface and a second sub-side surface, the first sub-side surface being in contact with the first main surface through the second sub-side surface, the orthographic projection of the second sub-side surface onto the surface containing the first main surface being outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface containing the first sub-side surface being outside the first sub-side surface. The angle between the surface perpendicular to the first main surface and passing through the boundary between the second sub-side surface and the first main surface and the second sub-side surface is a first angle, the angle between the surface defined by the boundary between the edge of the light leakage critical region away from the side surface and the second sub-side surface and the first main surface and passing through the boundary between the second sub-side surface and the first main surface and the second sub-side surface and being perpendicular to the first main surface is a second angle, and the difference between 90 degrees and the second angle is less than the first angle.

[0004] In the above scheme, when observing from the boundary of the light leakage critical zone away from the side surface on one side of the second main surface of the cover plate body, if the incident light rays that enter from the first main surface of the cover plate body and pass through the boundary between the second sub-side surface and the first main surface can be observed after refraction by the cover plate body, then on one side of the first main surface and the second sub-side surface of the cover plate body, the incident light rays will be located on the side away from the first main surface, where the normal line (perpendicular to the second sub-side surface) passes through the boundary between the second sub-side surface and the first main surface is located. That is, when the observer observes the edge of the cover plate body, the observed position will be further away from the edge of the cover plate body, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side surface, thereby reducing the difficulty of subsequent printing to block light on the second side surface. In this way, the visual observation effect of the cover plate body can be improved.

[0005] In one specific embodiment of the first aspect of this disclosure, the side surface further includes a third sub-side surface. The first sub-side surface is located between the second and third sub-side surfaces. The first sub-side surface connects to the second main surface via the third sub-side surface, and the angle between the surface perpendicular to the second main surface and the third sub-side surface is equal to the first angle. Thus, the provision of the third sub-side surface can help release stress at the edge of the cover plate body, thereby reducing the risk of edge chipping damage to the cover plate body during processing, printing, and other processes.

[0006] Optionally, the surface that passes through the intersection of the third sub-side surface and the second main surface and is perpendicular to the second main surface passes through the intersection of the second sub-side surface and the first main surface. Thus, the arrangement relationship between the third sub-side surface and the second main surface is the same as the arrangement relationship between the second sub-side surface and the first main surface.

[0007] In one specific embodiment of the first aspect of this disclosure, the ratio of the width of the light leakage critical region to the distance between the edge of the light leakage critical region away from the side surface and the boundary between the second sub-side surface and the first main surface is a first value. The arcsine of the product of the first value and the refractive index of the cover plate body is equal to the light leakage reference angle. The light leakage reference angle is an important indicator for measuring whether there is light leakage within the expected range at the edge of the cover plate body. As a reference value, if light leakage is observed at the edge of the cover plate body at this value, then even if there is no light leakage at other observation angles, it will be considered that the cover plate body will cause light leakage in actual application; conversely, if light leakage is not observed at the edge of the cover plate body at this value, then even if light leakage is observed at other observation angles, it will be considered that the cover plate body will not cause light leakage in actual application.

[0008] Optionally, the light leakage reference angle is 45 degrees.

[0009] In one specific embodiment of the first aspect of this disclosure, the first angle is no greater than 75 degrees. This ensures stress relief at the second sub-side, reducing the risk of edge chipping or damage to the cover plate body during processing, printing, and other procedures.

[0010] In one specific embodiment of the first aspect of this disclosure, the cover plate body may further include a light-shielding layer, at least a portion of which is located on the first main surface and covers the edge region of the first main surface.

[0011] In one specific embodiment of the first aspect of this disclosure, the orthographic projection of the light leakage critical region of the second main surface onto the surface where the first main surface is located coincides with the orthographic projection of the portion of the light-shielding layer located on the first main surface onto the surface where the first main surface is located. This allows for a reduction in the design width of the light-shielding layer, enabling the cover plate body to be applied to display panels with narrower bezels, thereby enhancing the display effect.

[0012] In another specific embodiment of the first aspect of this disclosure, the orthographic projection of the light leakage critical region of the second main surface onto the plane where the first main surface is located falls within the orthographic projection of the portion of the light-shielding layer on the first main surface onto the plane where the first main surface is located. This increases the coverage area of ​​the light-shielding layer, thereby further reducing the risk of edge light leakage.

[0013] Optionally, the portion of the light-shielding layer on the first main surface is formed by screen printing. Under this process, printing the light-shielding layer onto the second sub-side surface is more difficult than printing it onto the first main surface. However, with the above-described solution of this disclosure, due to the increase in the first angle, the second sub-side surface is relatively flat, thereby reducing the printing difficulty of the light-shielding layer on the second sub-side surface and further reducing light leakage at the edge of the cover plate body.

[0014] In one specific embodiment of the first aspect of this disclosure, the light-shielding layer covers at least a portion of the second sub-side surface. This further reduces the risk of light leakage at the edge of the cover plate body. It should be noted that because the second sub-side surface is angled, the fabrication of the light-shielding layer on the second sub-side surface is difficult, making it prone to light leakage. However, by employing the solution described above, this risk can be reduced.

[0015] In one specific embodiment of the first aspect of this disclosure, the thickness of the portion of the light-shielding layer covering the second sub-side surface is less than the thickness of the portion of the light-shielding layer covering the first main surface.

[0016] In one specific embodiment of the first aspect of this disclosure, the light-shielding layer is an ink layer. This light-shielding layer can directly absorb incident light, thereby reducing the risk of light leakage from the edges of the cover plate body.

[0017] In another specific embodiment of the first aspect of this disclosure, the portion of the ink layer located on the first main surface is the ink layer, and the portion of the light-shielding layer covering the second sub-side is the reflective layer. Thus, the light-shielding layer at the second sub-side can directly reflect incident light, reducing the risk of light leakage at the edge of the cover plate body.

[0018] In one specific embodiment of the first aspect of this disclosure, the cover plate body further includes a protective layer located on the side of the second main surface away from the first main surface and covering the second main surface. The protective layer can increase the strength of the cover plate body and modify the surface properties of the cover plate body to increase its resistance to scratches and other damage.

[0019] Optionally, the protective layer is a fluoride film.

[0020] A second aspect of this disclosure provides a cover plate comprising a cover plate body, the cover plate body including a first main surface, a second main surface, and a side surface, the first main surface and the second main surface being opposite each other and having parallel edge regions, and the side surface being located between and in contact with the first main surface and the second main surface. The side surface includes a first sub-side surface and a second sub-side surface, the first sub-side surface being in contact with the first main surface via the second sub-side surface, the orthographic projection of the second sub-side surface onto the surface containing the first main surface being outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface containing the first sub-side surface being outside the first sub-side surface. A first angle is formed between the surface perpendicular to the first main surface and the second sub-side surface at the boundary between the second sub-side surface and the first main surface. The cover plate is configured to have a second angle below a light leakage reference angle, the product of the sine of the second angle and the refractive index of the cover plate body being equal to the sine of the light leakage reference angle, and the difference between 90 degrees and the second angle being less than the first angle.

[0021] In the above scheme, when viewed from one side of the second main surface of the cover plate body at a light leakage reference angle, if the incident light rays that enter from one side of the first main surface of the cover plate body and pass through the boundary between the second sub-side and the first main surface are observable after refraction by the cover plate body, then on one side of the first main surface and the second sub-side of the cover plate body, the incident light rays will be located on the side of the second sub-side that is away from the first main surface, along the normal line (perpendicular to the second sub-side) passing through the boundary between the second sub-side and the first main surface. That is, when the observer observes the edge of the cover plate body, the observed position will be further away from the edge of the cover plate body, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side, thereby reducing the difficulty of subsequent printing to block light on the second side surface. Thus, the visual observation effect of the cover plate body can be improved.

[0022] In one specific embodiment of the second aspect of this disclosure, the light leakage reference angle is 45 degrees, and the first angle is no greater than 75 degrees.

[0023] This disclosure provides a method for preparing a cover plate, comprising: providing a cover plate body, the cover plate body including a first main surface, a second main surface, and a side surface, the first main surface and the second main surface being opposite to each other and having parallel edge regions, and the side surface being located between the first main surface and the second main surface and in contact with the first main surface and the second main surface; determining, based on the light leakage critical angle and the refractive index of the material of the cover plate body, the refraction angle of light incident from the outside at the light leakage critical angle in the cover plate body, the refraction angle being equal to a second angle; determining a first angle based on the second angle, wherein a pre-defined side surface, after processing, includes a first sub-side surface and a second sub-side surface, the first sub-side surface passing through the second sub-side surface. The first sub-side surface is in contact with the first main surface. The orthographic projection of the second sub-side surface on the surface where the first main surface is located is outside the first main surface, and the orthographic projection of the second sub-side surface on the surface where the first sub-side surface is located is outside the first sub-side surface. The angle between the surface that passes through the junction of the second sub-side surface and the first main surface and is perpendicular to the first main surface and the second sub-side surface is the first angle, and the first angle is greater than the difference between 90 degrees and the second angle. The dimensions of the first sub-side surface and the second sub-side surface are determined based on the first angle and the thickness of the cover plate body. The cover plate body is processed based on the dimensions of the first sub-side surface, the dimensions of the second sub-side surface, the corresponding first angle, and the thickness of the cover plate body to form the side surface of the cover plate body.

[0024] In one specific embodiment of the third aspect of this disclosure, the preparation method may further include: forming an ink layer as a light-shielding layer at least in the edge region of the first main surface by screen printing.

[0025] In one specific embodiment of the third aspect of this disclosure, the second main surface includes a light leakage critical region located at the edge of the second main surface and in contact with the side surface. The angle between the surface defined by the intersection of the edge of the light leakage critical region away from the side surface and the second sub-side surface and the first main surface, and the surface that passes through the intersection of the second sub-side surface and the first main surface and is perpendicular to the first main surface, is equal to a second angle. The orthographic projection of the light leakage critical region of the second main surface onto the surface of the first main surface coincides with the orthographic projection of the portion of the light-shielding layer located on the first main surface onto the surface of the first main surface.

[0026] In another specific embodiment of the second aspect of this disclosure, the second main surface includes a light leakage critical region located at the edge of the second main surface and in contact with the side surface. The angle between the plane defined by the intersection of the edge of the light leakage critical region away from the side surface and the second sub-side surface and the first main surface, and the plane passing through the intersection of the second sub-side surface and the first main surface and perpendicular to the first main surface, is equal to a second angle. The orthographic projection of the light leakage critical region of the second main surface on the plane where the first main surface is located is within the orthographic projection of the portion of the light-shielding layer on the first main surface on the plane where the first main surface is located.

[0027] The fourth aspect of this disclosure provides a display module, which includes a display panel and a cover plate of any one of the first or second aspects described above, or a cover plate obtained by the preparation method of the third aspect described above, wherein the display panel and the first main surface of the cover plate body of the cover plate are disposed opposite to each other. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the planar structure of a cover plate provided in one embodiment of the present disclosure.

[0029] Figure 2 for Figure 1 The cover plate shown is a cross-sectional view along M1-N1 under one design.

[0030] Figure 3 for Figure 2 The diagram shown illustrates the design principle of the display module.

[0031] Figure 4 for Figure 2 The cover plate shown is a cross-sectional view along M1-N1 in another design.

[0032] Figure 5 for Figure 2 The cover plate shown is a cross-sectional view along M1-N1 in another design.

[0033] Figure 6 for Figure 2 The cover plate shown is a cross-sectional view along M1-N1 in another design.

[0034] Figure 7 A flowchart illustrating a method for preparing a cover plate according to an embodiment of this disclosure.

[0035] Figure 8 This is a schematic diagram of a planar structure of a display module provided in an embodiment of the present disclosure.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10 - Cover plate; 20 - Display panel;

[0038] 100 - Cover plate body; 110 - First main surface; 120 - Second main surface; 121 - Light leakage critical zone; 130 - Side surface; 131 - First sub-side surface; 132 - Second sub-side surface; 133 - Third sub-side surface;

[0039] 200-Light-shielding layer;

[0040] 300 - Protective layer. Detailed Implementation

[0041] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0042] The strength, airtightness, and light-shielding properties of the display module are mainly achieved through the reinforcement and thickening of the cover plate and the use of screen printing ink. During the processing of the cover plate body, a C-corner design is used to prevent chipping at the corners. However, as the thickness of the cover plate body increases and the C-corners at the edges become larger, the printing process becomes more difficult. This can lead to situations where the C-corners at the edges of the cover plate body are not completely covered by ink, resulting in light leakage at the edges of the cover plate during inspection. This can affect the overall appearance of the display module after the cover plate is fully laminated into the display module.

[0043] This disclosure provides a cover plate and a display module to at least solve the aforementioned problems. The cover plate includes a cover plate body, which includes a first main surface, a second main surface, and a side surface. The first and second main surfaces are opposite to each other and their edge regions are parallel to each other. The side surface is located between and in contact with the first and second main surfaces. The second main surface includes a light leakage critical region located at the edge of the second main surface and in contact with the side surface. The side surface includes a first sub-side surface and a second sub-side surface. The first sub-side surface is in contact with the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface onto the surface where the first main surface is located is outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface where the first sub-side surface is located is outside the first sub-side surface. The angle between the plane that passes through the boundary of the second sub-side surface and the first main surface and is perpendicular to the first main surface and the second sub-side surface is the first angle. The angle between the plane that is determined by the edge of the light leakage critical region away from the side surface and the boundary of the second sub-side surface and the first main surface and the plane that passes through the boundary of the second sub-side surface and the first main surface and is perpendicular to the first main surface is the second angle. The difference between 90 degrees and the second angle is less than the first angle. In this cover plate, when viewed from the boundary of the light leakage critical zone away from the side surface on one side of the second main surface of the cover plate body, if the incident light rays incident from the first main surface of the cover plate body and passing through the boundary between the second sub-side surface and the first main surface can be observed after refraction by the cover plate body, then on one side of the first main surface and the second sub-side surface of the cover plate body, the incident light rays will be located on the side away from the first main surface, where the normal line (perpendicular to the second sub-side surface) passing through the boundary between the second sub-side surface and the first main surface is located. That is, when the observer observes the edge of the cover plate body, the observed position will be further away from the edge of the cover plate body, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side surface, thereby reducing the difficulty of subsequent printing to block light on the second side surface. Thus, the visual observation effect of the cover plate body can be improved.

[0044] The structure of the cover plate and display module according to at least one embodiment of the present disclosure will now be described in detail with reference to the accompanying drawings. Furthermore, in these drawings, a spatial rectangular coordinate system is established with the surface of the cover plate body (e.g., the surface of the first main surface described below) as a reference to more intuitively present the positional relationships of the relevant structures in the cover plate body. In this spatial rectangular coordinate system, the X-axis and Y-axis are parallel to the surface of the cover plate body, and the Z-axis is perpendicular to the surface of the cover plate body.

[0045] like Figure 1 and Figure 2As shown, the cover plate 10 includes a cover plate body 100, which includes a first main surface 110, a second main surface 120, and a side surface 130. The first main surface 110 and the second main surface 120 are opposite each other and their edge regions are parallel to each other. The side surface 130 is located between the first main surface 110 and the second main surface 120 and is in contact with the first main surface 110 and the second main surface 120. The second main surface 120 includes a light leakage critical region 121, which is located at the edge of the second main surface 120 and is in contact with the side surface 130. The side surface 130 includes a first sub-side surface 131 and a second sub-side surface 132. The first sub-side surface 131 is in contact with the first main surface 110 through the second sub-side surface 132. The orthographic projection of the second sub-side surface 132 on the surface where the first main surface 110 is located is outside the first main surface 110, and the orthographic projection of the second sub-side surface on the surface where the first sub-side surface 131 is located is outside the first sub-side surface 131. The angle between the plane P, which passes through the junction of the second sub-side surface 132 and the first main surface 110 and is perpendicular to the first main surface 110, and the second sub-side surface 132 is the first angle α. The angle between the plane defined by the edge of the light leakage critical region 121 away from the side surface 130 and the junction of the second sub-side surface 132 and the first main surface 110, and the plane that passes through the junction of the second sub-side surface 132 and the first main surface 110 and is perpendicular to the first main surface 110, is the second angle β. The difference between 90 degrees and the second angle is less than the first angle.

[0046] The second side 132 is inclined, which helps to release stress at the edge of the cover body 100, thereby reducing the risk of edge chipping and damage to the cover body 100 during processing, printing and other processes.

[0047] In addition, such as Figure 2 As shown, the incident light ray R1 enters from the first main surface 110 of the cover plate body 100 and passes through the boundary between the second sub-side surface 132 and the first main surface 110. After being refracted by the cover plate body 100, the light ray R1 is directed towards the second main surface 120 and exits from the second main surface 120. Therefore, light ray R1 is observed on one side of the second main surface 120 of the cover plate body 100 at the boundary of the light leakage critical region 121 away from the side surface 130. In this case, light ray R1 is observed on the first main surface 110 and the second sub-side surface 132 of the cover plate body 100. On one side, the incident ray R1 will be located on the side of the second sub-side surface 132 that is away from the first main surface 110, on the normal F1 (perpendicular to the second sub-side surface 132) passing through the intersection of the second sub-side surface 132 and the first main surface 110. That is, when an observer observes the edge of the cover body 100, the observed position will be further away from the edge of the cover body 100, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side surface 132, thereby reducing the difficulty of subsequent printing to block light on the second side surface 130. In this way, the visual observation effect of the cover body 100 can be improved.

[0048] It should be noted that when the cover plate 10 is applied to scenarios such as folding and flexible displays, some areas (e.g., the middle area) of the cover plate body 100 can be thinned, while the first main surface 110 and the second main surface 120 are the main surfaces of the cover plate body 100 that are not thinned.

[0049] Below, in conjunction with Figure 3 ,right Figure 2 The working principle of the structure shown will be explained.

[0050] like Figure 3 As shown, before the cover plate body 100 is modified by the technical solution of this disclosure, the side surface 130 of the cover plate body 100 includes a reference second sub-side surface 132a. The angle between the surface passing through the intersection of the reference second sub-side surface 132a and the first main surface 110 and perpendicular to the first main surface 110 and the reference second sub-side surface 132a is a first reference angle α1, which is less than the first angle α. Furthermore, the sum of the first reference angle α1 and the second angle β is 90 degrees. Thus, if the position of the observer receiving the incident light remains unchanged, the incident light will change from R1 to R2. The light ray R2 is perpendicular to the reference second sub-side surface 132a, that is, the light ray R2 coincides with the normal F2 of the reference second sub-side surface 132a. Obviously, in this state, with the observer's observation angle (γ) and observation position unchanged, only light reflected or emitted by objects further away from the cover body 100 can be captured by the observer along the path of light ray R1, while light reflected or emitted by objects closer to the bottom of the cover body 100 can be captured by the observer directly along the path of light ray R2. That is, after changing the tilt direction of the second sub-side 132a to the position of the second sub-side 132, the cover body 100 can better block the structure below in terms of optical effect, so as to reduce the risk of edge light transmission.

[0051] It should be noted that if the sum of the first reference angle α1 and the second angle β is less than 90 degrees, then according to Figure 3 Based on the principle shown, it can be deduced that the incident light rays will be tilted in a direction perpendicular to the first main surface 110, that is, the risk of edge light transmission will be further increased; in addition, this method will further increase the difficulty of printing on the second sub-side 132, thereby further increasing the risk of edge light transmission.

[0052] In at least one embodiment of this disclosure, such as Figure 2As shown, the side surface 130 also includes a third sub-side surface 133. The first sub-side surface 131 is located between the second sub-side surface 132 and the third sub-side surface 133. The first sub-side surface 131 connects to the second main surface 120 through the third sub-side surface 133, and the angle between the surface perpendicular to the second main surface 120 and the third sub-side surface 133 is equal to the first angle. That is, in Figure 2 In the cross-sectional view shown, the cross-sectional shape of the portion of the cover body 100 cut off by surface P is a regular trapezoid, with the top of the trapezoid being the first sub-side surface 131. Thus, the provision of the third sub-side surface 133 can help release stress at the edge of the cover body 100, thereby reducing the risk of edge chipping and damage to the cover body 100 during processing, printing, and other processes.

[0053] In at least one embodiment of this disclosure, such as Figure 2 As shown, the surface that passes through the intersection of the third sub-side surface 133 and the second main surface 120 and is perpendicular to the second main surface 120, and passes through the intersection of the second sub-side surface 132 and the first main surface 110, that is, this surface is Figure 2 The surface P is shown. Thus, the arrangement relationship between the third sub-side surface 133 and the second main surface 120 is the same as the arrangement relationship between the second sub-side surface 132 and the first main surface 110.

[0054] In at least one embodiment of this disclosure, such as Figure 2 As shown, the ratio of the width of the light leakage critical region 121 to the distance L between the edge of the light leakage critical region 121 away from the side surface 130 and the boundary between the second sub-side surface 132 and the first main surface 110 is a first value (the sine of the second angle β). The arcsine of the product of the first value and the refractive index of the cover body 100 is equal to the light leakage reference angle γ. Based on this, the boundary position of the light leakage critical region 121 can be determined. Conversely, based on the boundary position of the light leakage critical region 121, the first angle, and the thickness parameter of the cover body 100, the boundary position between the second sub-side surface 132 and the first main surface 110 can be deduced, so as to facilitate the design of the morphology of the side surface 130 of the cover body 100. It should be noted that the light leakage reference angle is an important indicator for measuring whether there is light leakage within the expected range at the edge of the cover plate body 100. As a reference value, if light leakage is observed at the edge of the cover plate body 100 under this value, then even if there is no light leakage at other observation angles, it will be considered that the cover plate body 100 will cause light leakage in actual application; conversely, if light leakage is not observed at the edge of the cover plate body 100 under this value, then even if light leakage is observed at other observation angles, it will be considered that the cover plate body 100 will not cause light leakage in actual application.

[0055] In the embodiments of this disclosure, the specific value of the light leakage reference angle is not limited and can be selected according to the standards of the actual process product. For example, in one test standard, the light leakage reference angle of the display module is set to 45 degrees. Under this standard, if no edge light leakage is observed on the cover plate, it is considered that the cover plate does not have an edge light leakage problem.

[0056] In at least one embodiment of this disclosure, the first angle is no greater than 75 degrees. This ensures stress relief at the second sub-side surface 132, reducing the risk of edge chipping or damage to the cover plate body 100 during processing, printing, and other processes.

[0057] In at least one embodiment of this disclosure, such as Figure 4 and Figure 5 As shown, the cover plate body 100 may further include a light-shielding layer 200, at least a portion of which is located on the first main surface 110 and covers the edge region of the first main surface 110.

[0058] For example, when the cover plate is applied to the display module, the light-shielding layer 200 actually acts as a black matrix (BM) to block light from the edge of the display module. In this way, light incident from the outside is difficult to be absorbed or reflected by the light-shielding layer 200, while light incident from inside the display module (such as the light R1 mentioned above) will also be absorbed or reflected by the light-shielding layer, thereby preventing light from passing through the edges of the display module.

[0059] In some embodiments of this disclosure, such as Figure 4 As shown, the orthographic projection of the light leakage critical region 121 of the second main surface 120 onto the surface where the first main surface 110 is located falls within the orthographic projection of the portion of the light-shielding layer 200 located on the first main surface 110 onto the surface where the first main surface 110 is located. In this way, the coverage area of ​​the light-shielding layer 200 can be increased to further reduce the risk of edge light leakage.

[0060] In other embodiments of this disclosure, such as Figure 5 As shown, the orthographic projection of the light leakage critical region 121 of the second main surface 120 onto the surface where the first main surface 110 is located coincides with the orthographic projection of the portion of the light-shielding layer 200 located on the first main surface 110 onto the surface where the first main surface 110 is located. In this way, the design width of the light-shielding layer 200 can be reduced, so that the cover plate body 100 can be applied to the display panel 20 with a narrower bezel, thereby improving the display effect.

[0061] The portion of the light-shielding layer 200 located on the first main surface 110 is formed by screen printing. Under this process, it is more difficult to print the light-shielding layer 200 onto the second sub-side surface 132 than onto the first main surface 110. However, with the above-described solution of this disclosure, due to the increase in the first angle, the second sub-side surface 132 is relatively flat, thereby reducing the printing difficulty of the light-shielding layer 200 on the second sub-side surface 132, and further reducing the generation of light leakage at the edge of the cover body 100.

[0062] In at least one embodiment of this disclosure, such as Figure 4 and Figure 5 As shown, the light-shielding layer 200 covers at least a portion of the second sub-side surface 132. This further reduces the risk of light leakage at the edge of the cover body 100. It should be noted that because the second sub-side surface 132 is angled, the fabrication of the light-shielding layer 200 on the second sub-side surface 132 is difficult, making it prone to light leakage. However, by employing the solution described above, this risk can be reduced.

[0063] In at least one embodiment of this disclosure, such as Figure 4 and Figure 5 As shown, the thickness of the portion of the light-shielding layer 200 covering the second sub-side surface 132 is less than the thickness of the portion of the light-shielding layer 200 covering the first main surface 110.

[0064] For example, in some embodiments of this disclosure, the light-shielding layer 200 is an ink layer. Thus, the light-shielding layer 200 can directly absorb incident light, reducing the risk of light leakage at the edges of the cover plate body 100.

[0065] For example, in some other embodiments of this disclosure, the portion of the ink layer located on the first main surface 110 is the ink layer, and the portion of the light-shielding layer 200 covering the second sub-side surface 132 is the reflective layer. Thus, the light-shielding layer 200 at the second sub-side surface 132 can directly reflect incident light, reducing the risk of light leakage at the edge of the cover body 100. For example, the reflective layer can be formed by electroplating or other methods. For example, the reflective layer can be made of metallic materials such as aluminum, silver, molybdenum, and titanium, or other types of reflective materials.

[0066] In at least one embodiment of this disclosure, such as Figure 6 As shown, the cover body 100 also includes a light-transmitting protective layer 300, which is located on the side of the second main surface 120 away from the first main surface 110 and covers the second main surface 120. The protective layer 300 can increase the strength of the cover body 100 and modify the surface properties of the cover body 100 to increase its resistance to scratches and other damage.

[0067] For example, the protective layer 300 is a fluoride film. The AF coating is an anti-fingerprint coating, and its main component is generally a fluorine-containing compound. The fluoride film has anti-fingerprint properties, effectively reducing fingerprint adhesion to the cover plate surface, making fingerprints less likely to remain, and even if they do, they are easier to wipe clean, maintaining the cleanliness and aesthetics of the cover plate surface. It also has good hydrophobic and oleophobic properties, allowing water and oil droplets to form beads on the cover plate surface, preventing penetration and diffusion, thus protecting the cover plate from water and oil contamination. The fluoride film also enhances the hardness and wear resistance of the cover plate surface to a certain extent, reducing damage caused by friction and scratches during daily use and extending the cover plate's lifespan. High-quality fluoride films can also increase light transmittance without affecting the cover plate's optical performance, resulting in a clearer display.

[0068] At least one embodiment of this disclosure provides a cover plate, which includes a cover plate body. The cover plate body includes a first main surface, a second main surface, and a side surface. The first main surface and the second main surface are opposite to each other and their edge regions are parallel to each other. The side surface is located between and in contact with the first main surface and the second main surface. The side surface includes a first sub-side surface and a second sub-side surface. The first sub-side surface is in contact with the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface onto the surface containing the first main surface is outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface containing the first sub-side surface is outside the first sub-side surface. The angle between the surface perpendicular to the first main surface and the second sub-side surface at the boundary of the second sub-side surface is a first angle. The cover plate is configured to have a second angle below a light leakage reference angle. The product of the sine of the second angle and the refractive index of the cover plate body is equal to the sine of the light leakage reference angle. The difference between 90 degrees and the second angle is less than the first angle. In this cover plate, when viewed from one side of the second main surface of the cover plate body at a light leakage reference angle, if the incident light rays that enter from one side of the first main surface of the cover plate body and pass through the boundary between the second sub-side surface and the first main surface are observable after refraction by the cover plate body, then on one side of the first main surface and the second sub-side surface of the cover plate body, the incident light rays will be located on the side of the second sub-side surface that is away from the first main surface, along the normal line (perpendicular to the second sub-side surface) passing through the boundary between the second sub-side surface and the first main surface. That is, when the observer observes the edge of the cover plate body, the observed position will be further away from the edge of the cover plate body, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side surface, thereby reducing the difficulty of subsequent printing to block light on the second side surface. Thus, the visual observation effect of the cover plate body can be improved. The structure of this cover plate, the technical problems it faces, the technical effects it achieves, the principle of solving the technical problems, and further improvements are available in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0069] At least one embodiment of this disclosure provides a method for preparing a cover plate, such as... Figure 7 As shown, the preparation method includes the following steps S100 to S500.

[0070] S100, a cover body is provided, the cover body includes a first main surface, a second main surface and a side surface, the first main surface and the second main surface are opposite to each other and their edge regions are parallel to each other, and the side surface is located between the first main surface and the second main surface and is in contact with the first main surface and the second main surface.

[0071] S200, based on the critical angle of light leakage and the refractive index of the material of the cover plate body, determines the angle of refraction of light incident from the outside at the critical angle of light leakage in the cover plate body, and the angle of refraction is equal to the second angle.

[0072] S300, determine the first angle based on the second angle, wherein the preset side surface includes a first sub-side surface and a second sub-side surface after processing. The first sub-side surface is connected to the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface on the surface where the first main surface is located is outside the first main surface, and the orthographic projection of the second sub-side surface on the surface where the first sub-side surface is located is outside the first sub-side surface. The angle between the surface that passes through the junction of the second sub-side surface and the first main surface and is perpendicular to the first main surface and the second sub-side surface is the first angle, and the first angle is greater than the difference between 90 degrees and the second angle.

[0073] S400, the dimensions of the first sub-side and the second sub-side are determined based on the first angle and the thickness of the cover body.

[0074] S500, based on the dimensions of the first sub-side, the dimensions of the second sub-side and the corresponding first angle, and the thickness of the cover body, the cover body is processed to form the side surface of the cover body.

[0075] For example, after processing, the cover plate body can be ground and polished. Additionally, the cover plate body can be placed in a strengthening furnace for further treatment to improve its strength.

[0076] In the cover plate obtained by the preparation method in steps S100 to S500 above, when viewed from the boundary of the light leakage critical zone away from the side surface on one side of the second main surface of the cover plate body, if the incident light rays that are incident from the first main surface of the cover plate body and pass through the boundary between the second sub-side surface and the first main surface can be observed after refraction by the cover plate body, then on one side of the first main surface and the second sub-side surface of the cover plate body, the incident light rays will be located on the side away from the first main surface, which is the normal line (perpendicular to the second sub-side surface) passing through the boundary between the second sub-side surface and the first main surface. That is, when the observer observes the edge of the cover plate body, the observed position will be further away from the edge of the cover plate body, making it more difficult for the observer to see the edge-transparency phenomenon. This method can also reduce the tilt angle of the second sub-side surface, thereby reducing the difficulty of subsequent printing for light blocking on the second side surface. In this way, the visual observation effect of the cover plate body can be improved. The specific structure of the cover plate obtained in steps S100 to S700, the technical problems it faces, the technical means and principles for solving the technical problems, and the further improvements that can be made, can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0077] For example, at least one embodiment of this disclosure provides a method for preparing a cover plate that may further include: forming an ink layer as a light-shielding layer at least in the edge region of a first main surface by screen printing. The specific structure of the cover plate obtained by this step, the technical problems encountered, the technical means and principles for solving these problems, and further improvements can be found in the foregoing. Figure 4 The relevant descriptions in the related embodiments will not be repeated here.

[0078] At least one embodiment of this disclosure provides a display module, such as Figure 8 As shown, the display module includes a display panel 20 and the aforementioned cover plate 10, with the display panel 20 and the first main surface 110 of the cover plate body 100 of the cover plate 10 being disposed opposite each other.

[0079] The display module can be used in any product or component with a display function, such as a TV, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator. For example, the display module can be used in products such as foldable phones and tablets.

[0080] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0081] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cover plate, characterized in that The device includes a cover plate body, wherein the cover plate body includes a first main surface, a second main surface, and a side surface, the first main surface and the second main surface are opposite to each other and their edge regions are parallel to each other, and the side surface is located between the first main surface and the second main surface and is in contact with the first main surface and the second main surface. The second main surface includes a light leakage critical region located at the edge of the second main surface and in contact with the side surface. The side surface includes a first sub-side surface and a second sub-side surface. The first sub-side surface is in contact with the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface onto the surface containing the first main surface is outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface containing the first sub-side surface is also outside the first sub-side surface. The angle between the plane passing through the intersection of the second sub-side surface and the first main surface and perpendicular to the first main surface and the second sub-side surface is the first angle. The angle between the plane defined by the edge of the light leakage critical region away from the side surface and the intersection of the second sub-side surface and the first main surface and the plane passing through the intersection of the second sub-side surface and the first main surface and perpendicular to the first main surface is the second angle. The difference between 90 degrees and the second angle is less than the first angle.

2. The cover sheet of claim 1, wherein The side surface further includes a third sub-side surface. The first sub-side surface is located between the second sub-side surface and the third sub-side surface. The first sub-side surface is connected to the second main surface through the third sub-side surface. The angle between the first sub-side surface and the third sub-side surface, which passes through the junction of the third sub-side surface and the second main surface and is perpendicular to the second main surface, is equal to the first angle.

3. The cover plate according to claim 2, characterized in that, A surface passing through the intersection of the third sub-side surface and the second main surface and perpendicular to the second main surface, and passing through the intersection of the second sub-side surface and the first main surface.

4. The cover plate according to claim 2, characterized in that, The ratio of the width of the light leakage critical region to the distance between the edge of the light leakage critical region away from the side surface and the junction of the second sub-side surface and the first main surface is a first value, and the arcsine of the product of the first value and the refractive index of the cover plate body is equal to the light leakage reference angle.

5. The cover plate according to claim 4, characterized in that, The light leakage reference angle is 45 degrees.

6. The cover plate according to claim 1, characterized in that, The first angle is no greater than 75 degrees.

7. The cover plate according to any one of claims 1 to 6, characterized in that, Includes a light-shielding layer, wherein at least a portion of the light-shielding layer is located on the first main surface, and the light-shielding layer covers the edge region of the first main surface.

8. The cover plate according to claim 7, characterized in that, The orthographic projection of the light leakage critical region of the second main surface onto the surface where the first main surface is located coincides with the orthographic projection of the portion of the light-shielding layer located on the first main surface onto the surface where the first main surface is located. or The orthographic projection of the light leakage critical region of the second main surface onto the surface where the first main surface is located is within the orthographic projection of the portion of the light-shielding layer on the first main surface onto the surface where the first main surface is located.

9. The cover plate according to claim 7, characterized in that, The portion of the light-shielding layer located on the first main surface is formed by screen printing.

10. The cover plate according to claim 7, characterized in that, The light-shielding layer covers at least a portion of the second sub-side.

11. The cover plate according to claim 10, characterized in that, The thickness of the portion of the light-shielding layer covering the second sub-side surface is less than the thickness of the portion of the light-shielding layer covering the first main surface.

12. The cover plate according to claim 10, characterized in that, The light-shielding layer is an ink layer; or The portion of the ink layer located on the first main surface is the ink layer, and the portion of the light-shielding layer covering the second sub-side is the reflective layer.

13. The cover plate according to any one of claims 1 to 6, characterized in that, It also includes a protective layer located on the side of the second main surface away from the first main surface and covering the second main surface.

14. The cover plate according to claim 13, characterized in that, The protective layer is a fluoride film.

15. A cover plate, characterized in that, The device includes a cover plate body, wherein the cover plate body includes a first main surface, a second main surface, and a side surface, the first main surface and the second main surface are opposite to each other and their edge regions are parallel to each other, and the side surface is located between the first main surface and the second main surface and is in contact with the first main surface and the second main surface. The side surface includes a first sub-side surface and a second sub-side surface. The first sub-side surface is connected to the first main surface through the second sub-side surface. The orthographic projection of the second sub-side surface onto the surface containing the first main surface lies outside the first main surface, and the orthographic projection of the second sub-side surface onto the surface containing the first sub-side surface also lies outside the first sub-side surface. The angle between the plane passing through the intersection of the second sub-side surface and the first main surface and the second sub-side surface is a first angle. The cover plate is configured to have a second angle below the light leakage reference angle. The product of the sine of the second angle and the refractive index of the cover plate body is equal to the sine of the light leakage reference angle. The difference between 90 degrees and the second angle is less than that between the first angle and the second angle.

16. The cover plate according to claim 15, characterized in that, The light leakage reference angle is 45 degrees, and the first angle is no greater than 75 degrees.

17. A display module, characterized in that, It includes a display panel and a cover plate according to any one of claims 1 to 16, wherein the display panel is disposed opposite to the first main surface of the cover plate body in the cover plate.

Images