Cover plate and manufacturing method thereof, and display device

Abstract

Embodiments of the present application provide a cover plate, a manufacturing method thereof and a display device. The cover plate comprises a main body part and an edge part extending from the main body part to a direction away from the center of the main body part. The orthographic projection of the main body part along the thickness direction of the cover plate coincides with the orthographic projection of the display area of the display module along the thickness direction of the cover plate. The outer side surface of the edge part is provided with a light shielding layer. Since the outer side surface of the edge part is provided with the light shielding layer, the light can be prevented from being emitted from the edge part, thereby solving the problem of light leakage of the edge part and halo formation.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a cover plate, a method for manufacturing the same, and a display device. Background Technology

[0002] With the continuous development of smart technology, electronic products such as smartphones, smartwatches, and tablets have become widely used. For these products, the cover glass is one of the core components. Generally made of glass, the cover glass adheres to the front of the device and forms the display screen along with other components. However, most cover glasses lack a light-leakage prevention structure, often resulting in light leakage around the edges. This creates a halo around the cover, negatively impacting the user experience. Summary of the Invention

[0003] The purpose of this application is to provide a cover plate, its manufacturing method, and a display device to solve the problem of halo effects on the edges of the cover plate. The specific technical solution is as follows:

[0004] The first aspect of this application provides a cover plate, the cover plate including a main body portion and an edge portion extending circumferentially from the main body portion away from the center of the main body portion, the orthographic projection of the main body portion along the thickness direction of the cover plate is used to coincide with the orthographic projection of the display area of ​​the display module along the thickness direction of the cover plate, and the outer side of the edge portion is provided with a light-shielding layer.

[0005] In addition, the cover plate provided in the first aspect of this application may also have the following technical features:

[0006] In some embodiments, the edge portion is a bent portion extending circumferentially from the main body portion away from the center of the main body portion, so that the cover plate has a receiving groove. The cover plate includes a first outer surface, a first inner surface opposite to the first outer surface, and a bottom surface connecting the first outer surface and the first inner surface. The first outer surface is the surface where the light-emitting side is located. The first outer surface of the main body portion includes a first plane and a first arc surface located on both sides of the first plane. The first arc surface extends in a direction close to the bottom surface. The first outer surface of the edge portion includes a second arc surface connected to the first arc surface and an outer surface connected to the second arc surface and the bottom surface.

[0007] In some embodiments, the outer surface is a plane and is perpendicular to the first plane.

[0008] In some embodiments, the height of the outer side is 0.5 to 0.8 times the thickness of the cover plate.

[0009] In some embodiments, the first inner surface of the edge portion includes a first segment connected to the main body portion and a second segment and a third segment sequentially connected to the first segment. The first segment is a horizontal plane, the second segment is an arc surface, and the third segment is a plane and perpendicular to the first segment. The first segment, the second segment, and the third segment are provided with the light-shielding layer.

[0010] In some embodiments, the bottom surface is provided with the light-shielding layer.

[0011] In some embodiments, along the thickness direction of the cover plate, the portion of the second arc surface lower than the first segment is provided with a light-shielding layer.

[0012] In some embodiments, the arc length of the portion of the second arc surface where the light-shielding layer is provided does not exceed 1 / 2 of the arc length of the second arc surface that is lower than that of the first segment.

[0013] In some embodiments, the light-shielding layer of the first segment is provided by pad printing, and the light-shielding layers of the second and third segments are provided by spraying.

[0014] In some embodiments, the edge portion is a protrusion extending circumferentially from the main body portion away from the center of the main body portion. The main body portion includes a second outer surface and a second inner surface opposite to and parallel to the second outer surface. The protrusion includes a third inner surface flush with the second inner surface and an outer side surface connecting the third inner surface and the second outer surface. The outer side surface includes a first vertical surface, a first parallel surface, and a second vertical surface connected in sequence. The first vertical surface is perpendicular to the third inner surface, the first parallel surface is parallel to the third inner surface, and the second vertical surface is perpendicular to the first parallel surface. The first vertical surface, the first parallel surface, and the second vertical surface are provided with a light-shielding layer.

[0015] In some embodiments, a transition slope is further included between the second outer surface and the first vertical surface, and the transition slope is not provided with a light-shielding layer.

[0016] In some embodiments, the light-shielding layer disposed on the first vertical surface extends from one end near the third inner surface to a distance of 0.1mm-0.3mm from the intersection of the transition slope and the first vertical surface.

[0017] In some embodiments, the third inner surface is provided with a light-shielding layer.

[0018] In some embodiments, the first vertical plane and the first parallel plane are connected by an arc.

[0019] In some embodiments, the third inner surface and the second vertical surface, and the second vertical surface and the first parallel surface are chamfered.

[0020] In some embodiments, the light-shielding layer is an ink layer, and the thickness of the ink layer is greater than or equal to 6 μm.

[0021] A second aspect of this application also provides a method for manufacturing a cover plate, comprising the following steps:

[0022] The cover plate is provided, the cover plate includes a main body portion and an edge portion extending circumferentially from the main body portion away from the center of the main body portion, the orthographic projection of the main body portion along the thickness direction of the cover plate coincides with the orthographic projection of the display area of ​​the display module along the thickness direction of the cover plate.

[0023] A protective film is affixed to the outer surface of the main body of the cover plate.

[0024] A light-shielding layer is sprayed onto the outer surface of the edge.

[0025] The light-shielding layer is pre-baked.

[0026] Wipe away any excess of the aforementioned light-shielding layer.

[0027] The light-shielding layer is then subjected to a final baking process.

[0028] In some embodiments, the edge portion is a bent portion extending circumferentially from the main body portion away from the center of the main body portion, and the first inner surface of the edge portion includes a first segment connected to the main body portion and a second segment and a third segment sequentially connected to the first segment. Prior to the step of spraying a light-shielding layer onto the outer surface of the edge portion, the method further includes:

[0029] The first section of the light-shielding layer is printed using a pad printing machine.

[0030] The light-shielding layer after pad printing is then subjected to a final baking process.

[0031] Clean the cover plate.

[0032] A protective film is affixed to the first inner surface of the main body.

[0033] The light-shielding layer is sprayed onto the second section and the third section.

[0034] In some embodiments, the edge portion is a protrusion extending circumferentially from the main body portion away from the center of the main body portion. The main body portion includes a second outer surface and a second inner surface opposite to and parallel to the second outer surface. The protrusion includes a third inner surface flush with the second inner surface and an outer side surface connecting the third inner surface and the second outer surface. The outer side surface includes a first vertical surface, a first parallel surface, and a second vertical surface connected in sequence. Before the step of spraying a light-shielding layer onto the outer side surface of the edge portion, the method further includes:

[0035] A light-shielding layer is printed on the third inner surface using a pad printing machine.

[0036] The light-shielding layer after pad printing is then subjected to a final baking process.

[0037] Clean the cover plate.

[0038] A protective film is affixed to the second inner surface of the main body.

[0039] A third aspect of this application provides a display device, the display device including the cover plate described above.

[0040] Beneficial effects of the embodiments in this application:

[0041] The cover plate, its manufacturing method, and the display device provided in this application embodiment have a light-shielding layer on the outer side of the edge portion of the cover plate. When the light emitted from the display area shines on the edge portion through the main body portion, the light can be prevented from escaping from the edge portion because the outer side of the edge portion has a light-shielding layer, thereby solving the problem of light leakage from the edge portion and the formation of a halo.

[0042] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0044] Figure 1 A schematic diagram illustrating the halo effect caused by light leakage at the edge of the cover plate;

[0045] Figure 2 This is a schematic diagram of the structure of a cover plate provided in an embodiment of this application;

[0046] Figure 3 for Figure 2 A schematic diagram of light transmission after the middle cover plate is fitted onto the display module and coated with a light-shielding layer;

[0047] Figure 4 for Figure 3 A schematic diagram showing the light transmission process where some light still shines out from the edge of the cover plate after it has been coated with a light-shielding layer.

[0048] Figure 5 In order to be in Figure 3 A schematic diagram of a structure with an added light-shielding layer on the second curved surface;

[0049] Figure 6 This is a schematic diagram of another cover plate provided in an embodiment of this application;

[0050] Figure 7 for Figure 6 A schematic diagram of the structure of the middle cover plate coated with a light-shielding layer;

[0051] Figure 8 A partial structural diagram of a cover plate coated with a light-shielding layer;

[0052] Figure 9 This is a schematic diagram for detecting light leakage from the cover plate.

[0053] Figure 10 This is a schematic diagram showing light leakage detection performed on a fixture after the display module is closed.

[0054] The reference numerals in the attached drawings are as follows: cover plate 1; first outer surface 1a; first inner surface 1b; main body 10; first plane 11; first arc surface 12; second outer surface 13; second inner surface 14; edge 20; first segment 20a; second segment 20b; third segment 20c; outer side 21; second arc surface 22; bottom surface 23; third inner surface 24; first vertical surface 25; first parallel surface 26; second vertical surface 27; transition slope 28; light-shielding layer 30; thickness direction H; light-shielding plate 2; platform 3; fixture 4; display module 5; halo 6. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0056] When using cover plate 1, light often leaks out from its edges, resulting in a halo 6 appearing around the outer perimeter of cover plate 1 to the naked eye. Figure 1 As shown, this results in a poor user experience.

[0057] To solve the halo problem 6 caused by light leakage around the cover plate 1, such as Figure 2 , Figure 3 and Figure 4 As shown, the first aspect of this application provides a cover plate 1, which includes a main body 10 and an edge portion 20 extending circumferentially from the main body 10 away from the center of the main body 10. The orthographic projection of the main body 10 along the thickness direction H of the cover plate 1 coincides with the orthographic projection of the display area of ​​the display module 5 along the thickness direction H of the cover plate 1. A light-shielding layer 30 is provided on the outer side surface 21 of the edge portion 20.

[0058] In this embodiment, a light-shielding layer 30 is provided on the outer side 21 of the edge portion 20 of the cover plate 1. When the light emitted from the display area shines on the edge portion 20 through the main body portion 10, the light-shielding layer 30 on the outer side 21 of the edge portion 20 can prevent light from escaping from the edge portion 20, thereby solving the problem of halo 6 formed due to light leakage from the edge portion 20.

[0059] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the edge portion 20 is a bent portion extending circumferentially from the main body portion 10 away from the center of the main body portion 10, so that the cover plate 1 has a receiving groove. The cover plate 1 includes a first outer surface 1a, a first inner surface 1b opposite to the first outer surface 1a, and a bottom surface 23 connecting the first outer surface 1a and the first inner surface 1b. The first outer surface 1a is the surface where the light-emitting side is located. The first outer surface 1a of the main body portion 10 includes a first plane 11 and a first arc surface 12 located on both sides of the first plane 11. The first arc surface 12 extends in a direction close to the bottom surface 23. The first outer surface 1a of the edge portion 20 includes a second arc surface 22 connected to the first arc surface 12 and an outer surface 21 connected to the second arc surface 22 and the bottom surface 23.

[0060] In this embodiment, the edge portion 20 is a bent portion formed relative to the main body portion 10. The bent portion and the main body portion 10 can form a receiving groove, which is used to accommodate components such as the display module 5. The main body portion 10 is generally planar, that is, the first plane 11 located in the middle. At the position where it connects with the edge portion 20, it has a first arc surface 12 that transitions to the bent portion. The outer surface of the edge portion 20 includes a second arc surface 22 connected to the first arc surface 12 of the main body portion 10 and an outer side surface 21 connected to the second arc surface 22. The outer side surface 21 is a vertical surface. A light-shielding layer 30 is provided on the outer side surface 21, which can greatly reduce the amount of light emitted from the cover plate 1 to the surrounding area, thereby reducing the probability of forming a halo 6 around the cover plate 1.

[0061] Among them, such as Figure 2 As shown, the first outer surface 1a is the surface where the light-emitting side of the cover plate 1 is located. The light-emitting side refers to the surface through which the light finally passes.

[0062] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the outer surface 21 is a plane and is perpendicular to the first plane 11. Setting the outer surface 21 as a plane perpendicular to the first plane 11, compared with an outwardly protruding arc surface, helps to reduce the circumferential dimension of the cover plate 1, and makes the overall outline of the first outer surface 1a of the cover plate 1 relatively smooth, so that the cover plate 1 has a simple and elegant appearance.

[0063] In some embodiments, such as Figure 3 and Figure 4 As shown, the height of the outer side 21 is greater than or equal to 0.5 times the thickness of the cover plate 1. Optionally, the height of the outer side 21 can be 0.5 times, 0.6 times, 0.7 times, 0.8 times, etc., the thickness of the cover plate 1.

[0064] In this embodiment, the height of the outer surface 21 determines the height of the light-shielding layer 30. The height of the outer surface 21 is greater than or equal to 0.5 times the thickness of the cover plate 1. For example, the height of the outer surface 21 is 0.55 times, 0.6 times, 0.7 times, or 0.75 times the thickness of the cover plate 1. The greater the height of the outer surface 21, the greater the height of the light-shielding layer 30, which can better prevent light from escaping from the sides of the cover plate 1. However, the height of the outer surface 21 should not be too large, for example, greater than 0.8 times the thickness of the cover plate 1, because an excessively large height will affect the thickness of the display device and is not conducive to the thinning and lightening of the display device.

[0065] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the first inner surface 1b of the edge portion 20 includes a first segment 20a connected to the main body portion and a second segment 20b and a third segment 20c connected sequentially to the first segment 20a. The first segment 20a is a horizontal surface, the second segment 20b is an arc surface, and the third segment 20c is a plane and perpendicular to the first segment 20a. The first segment 20a, the second segment 20b and the third segment 20c are provided with a light-shielding layer 30.

[0066] In this embodiment, a light-shielding layer 30 is provided on the first inner surface 1b of the edge portion 20, which can reduce the light emitted from the inner surface of the edge portion 20 to the outer surface, and further reduce the possibility of light leakage from the edge portion 20.

[0067] In some embodiments, such as Figure 3 and Figure 4 As shown, the bottom surface 23 is provided with a light-shielding layer 30.

[0068] In this embodiment, a light-shielding layer 30 is provided on the bottom surface 23, which can reduce the light emitted from the bottom surface 23 to the outer surface, and further reduce the possibility of light leakage at the edge 20.

[0069] like Figure 3 As shown, providing a light-shielding layer 30 only on the outer surface 21 of the cover plate 1 can block light emitted from the edge 20 to a certain extent, but as... Figure 4 As shown, there is still a problem that a small amount of light can escape from the edge 20.

[0070] To further reduce the possibility of edge light leakage, in some embodiments, such as Figure 5 As shown, along the thickness direction H of the cover plate 1, the portion of the second arc surface 22 that is lower than the first segment 20a is provided with a light-shielding layer 30.

[0071] In this embodiment, by providing a light-shielding layer 30 on the portion of the second arc surface 22 that is lower than the first segment 20a, the area of ​​the light-shielding layer 30 on the edge portion 20 is further increased. Therefore, it is possible to further block the possibility of light emanating from the outer periphery of the cover plate 1, thereby reducing the probability of a halo 6 forming around the cover plate 1.

[0072] Among them, the area of ​​the light-shielding layer 30 on the second arc surface 22 can be flush with the first inner surface 1b.

[0073] Optionally, such as Figure 5 As shown, the arc length of the portion of the second arc surface 22 with the light-shielding layer 30 does not exceed 1 / 2 of the arc length of the second arc surface 22 that is lower than the first segment 20a (the portion lower than the first segment 20a is shown below the dotted line S1 in the figure). For example, it can be 1 / 3, 1 / 4, etc., of the arc length lower than the first segment 20a. The arc length of this portion with the light-shielding layer 30 can be greater than or equal to 1 / 5 of the total arc length of the first segment 20a to ensure that the area of ​​the second arc surface 22 with the light-shielding layer 30 is sufficient to block light leakage from the edge portion 20.

[0074] In some embodiments, the light-shielding layer 30 of the first segment 20a is provided by pad printing, and the light-shielding layers 30 of the second segment 20b and the third segment 20c are provided by spraying.

[0075] In this embodiment, since the first segment 20a is located close to the main body 10, its setting accuracy directly affects the display range of the display area of ​​the main body 10. Therefore, by using pad printing, the setting accuracy of the light-shielding layer 30 can be guaranteed, thereby ensuring the accuracy of the display range of the display area. As for the second segment 20b and the third segment 20c, the setting accuracy requirements are relatively low, so they can be set by spraying. Spraying is a simpler process than pad printing and can improve the coating efficiency of the light-shielding layer 30.

[0076] In other embodiments, such as Figure 6 , Figure 7 and Figure 8 As shown, the edge portion 20 is a protrusion extending circumferentially from the main body portion 10 away from the center of the main body portion 10. The main body portion 10 includes a second outer surface 13 and a second inner surface 14 that is opposite to and parallel to the second outer surface 13. The protrusion includes a third inner surface 24 that is flush with the second inner surface 14 and an outer surface 21 that connects the third inner surface 24 and the second outer surface 13. The outer surface 21 includes a first vertical surface 25, a first parallel surface 26, and a second vertical surface 27 that are connected in sequence. The first vertical surface 25 is perpendicular to the third inner surface 24, the first parallel surface 26 is parallel to the third inner surface 24, and the second vertical surface 27 is perpendicular to the first parallel surface 26. The first vertical surface 25, the first parallel surface 26, and the second vertical surface 27 are all provided with a light-shielding layer 30.

[0077] In this embodiment, the edge portion 20 is a protrusion extending circumferentially away from the center of the main body portion 10 relative to the bottom of the main body portion 10. The bottom refers to the portion away from the light-emitting side of the cover plate 1 along the thickness direction H of the cover plate 1. The protrusion extends outward from the main body portion 10, that is, the protrusion is an extension with a thickness less than the main body portion 10 and flush with the second inner surface 14 of the main body portion 10. The extended portion of the protrusion is used to fasten with the middle frame to form a housing, thereby protecting the internal components.

[0078] In this embodiment, the outer surface 21 includes a first vertical surface 25, a first parallel surface 26, and a second vertical surface 27 connected in sequence. Each of the first vertical surface 25, the first parallel surface 26, and the second vertical surface 27 is provided with a light-shielding layer 30, which can block light emitted from the side of the edge portion 20, reducing the probability of light leakage from the side of the edge portion 20. For this type of cover plate 1, the formation of the halo 6 mainly originates from light leakage from the outer surface 21. Therefore, providing a light-shielding layer 30 on the outer surface 21 can solve the problem of halo 6 formation on the cover plate 1 and improve the user experience.

[0079] In some embodiments, such as Figure 7 , Figure 8 As shown, a transition slope 28 is also included between the second outer surface 13 and the first vertical surface 25, and the transition slope 28 is not provided with a light-shielding layer 30.

[0080] In this embodiment, the second outer surface 13 and the first vertical surface 25 are connected by a transition slope 28. This transition slope 28 does not have a light-shielding layer 30, which is beneficial to the uniformity of the appearance of the cover plate 1. The setting of this transition slope 28 helps to avoid the outer periphery of the cover plate 1 being too sharp, which can reduce the probability of damage caused by bumps and scratches to users.

[0081] In some embodiments, the light-shielding layer 30 of the first vertical surface 25 extends from one end near the third inner surface 24 to a distance of 0.1mm-0.3mm from the intersection of the transition slope 28 and the first vertical surface 25.

[0082] In this embodiment, the light-shielding layer 30 disposed on the first vertical surface 25 extends from one end near the third inner surface 24 to a distance of 0.1mm-0.3mm from the intersection of the transition slope 28 and the first vertical surface 25, for example, 0.15mm, 0.2mm, 0.25mm, 0.3mm from the intersection, etc. Figure 8 As shown, the portion above the dashed line S2 is provided with a light-shielding layer 30. This distance ensures that the light-shielding layer 30 has sufficient area on the first vertical surface 25 to block light from escaping from the outer side 21, thereby solving the problem of light leakage at the edge 20 of the cover plate 1.

[0083] In some embodiments, such as Figure 7 , Figure 8 As shown, the third inner surface 24 is provided with a light-shielding layer 30.

[0084] In this embodiment, the third inner surface 24 of the edge portion 20 is provided with a light-shielding layer 30, which can further prevent light leakage from the edge portion 20. Since the edge portion 20 itself does not need to be displayed, the third inner surface 24 is provided with a light-shielding layer 30, so that the edge portion 20 of the cover plate 1 looks completely black, improving the appearance consistency of the cover plate 1 and enhancing the user experience.

[0085] In some embodiments, such as Figure 8 As shown, the first vertical surface 25 and the first parallel surface 26 are connected by an arc.

[0086] In this embodiment, the first vertical surface 25 and the first parallel surface 26 are connected by an arc, that is, the first vertical surface 25 and the first parallel surface 26 are rounded (R-angle), so that the corners of the outer surface 21 are no longer sharp, but become more rounded, which can reduce the probability of damage or scratches to users caused by bumps.

[0087] In some embodiments, the third inner surface 24 and the second vertical surface 27, and the second vertical surface 27 and the first parallel surface 26 are chamfered.

[0088] In this embodiment, the third inner surface 24 and the second vertical surface 27, and the second vertical surface 27 and the first parallel surface 26 are chamfered, so that the corners of the outer surface 21 are no longer sharp corners, making it easier for the outer surface 21 to cooperate with other components such as the middle frame.

[0089] In the above embodiments, the light-shielding layer 30 is an ink layer with a thickness greater than or equal to 6 μm, such as 6.5 μm, 7 μm, 7.5 μm, 8 μm, etc. The ink layer has good light-shielding effect and is easy to coat. If the ink layer is too thin, such as less than 6 μm, the light-shielding effect will be insufficient. However, while meeting the light-shielding effect, the ink layer should not be too thick either, as an excessively thick ink layer will waste raw materials and increase costs.

[0090] A second aspect of this application provides a method for manufacturing a cover plate, comprising the following steps:

[0091] S1: Provide a cover plate 1, which includes a main body 10 and an edge portion 20 extending circumferentially from the main body 10 away from the center of the main body 10. The orthographic projection of the main body 10 along the thickness direction H of the cover plate 1 coincides with the orthographic projection of the display area of ​​the display module 5 along the thickness direction H of the cover plate 1.

[0092] S2: Apply a protective film to the outer surface of the main body 10 of the cover plate 1.

[0093] S3: Apply a light-shielding layer 30 to the outer surface 21 of the edge portion 20.

[0094] S4: Pre-bake the light-shielding layer 30.

[0095] S5: Wipe away excess light-blocking layer 30.

[0096] S6: Perform final baking on the light-shielding layer 30.

[0097] In some embodiments, the edge portion 20 is a bent portion extending circumferentially from the main body portion 10 away from the center of the main body portion 10. The first inner surface 1b of the edge portion 20 includes a first segment 20a connected to the main body portion 10 and a second segment 20b and a third segment 20c sequentially connected to the first segment 20a. Before the step of spraying the light-shielding layer 30 onto the outer surface 21 of the edge portion 20, the method further includes:

[0098] S21: The light-shielding layer 30 is printed in the first section 20a by a pad printing machine.

[0099] S22: Perform final baking on the light-blocking layer 30 after pad printing.

[0100] S23: Clean the cover plate 1.

[0101] S24: Apply a protective film to the first inner surface 1b of the main body 10.

[0102] S25: Apply a light-shielding layer to the second section 20b and the third section 20c.

[0103] It should be noted that steps S21-S23 can be performed before or after step S2. The order of steps S24 and S21 can be reversed. Step S25 can also be performed after step S3 and after step S4. The method of this embodiment is for... Figures 1-5 The cover plate 1 shown.

[0104] In some embodiments, the edge portion 20 is a protrusion extending circumferentially from the main body portion 10 away from the center of the main body portion 10. The main body portion 10 includes a second outer surface 13 and a second inner surface 14 facing away from and parallel to the second outer surface 13. The protrusion includes a third inner surface 24 flush with the second inner surface 14 and an outer surface 21 connecting the third inner surface 24 and the second outer surface 13. The outer surface 21 includes a first vertical surface 25, a first parallel surface 26, and a second vertical surface 27 connected in sequence. Before the step of spraying a light-shielding layer onto the outer surface 21 of the edge portion 20, the following steps are also included:

[0105] S21: A light-shielding layer is printed on the third inner surface using a pad printing machine.

[0106] S22: Perform final baking on the light-blocking layer after pad printing.

[0107] S23: Clean the cover plate.

[0108] S24: Apply a protective film to the second inner surface of the main body.

[0109] It should be noted that steps S21-S23 can be performed before or after step S2. The order of steps S24 and S21 can be reversed. The method of this embodiment is for... Figures 6-8 The cover plate 1 shown.

[0110] Taking the edge portion 20 of the cover plate 1 as an example, which is bent relative to the main body portion 10, the ink coating process will be described in detail. Before coating the cover plate 1, a protective film is first applied to the outer surface of the main body portion 10 for protection. Then, the pad printing head of the pad printing machine picks up ink from the etching plate and aligns the pad with the first segment 20a of the bent portion for transfer printing. The cylinder of the pad printing machine controls the pad to rotate once around the first segment 20a of the bent portion, transferring the ink to the surface of the first segment 20a of the bent portion. The surface of the first segment 20a is flat and can make full contact with the pad of the pad printing machine, thus achieving a good transfer printing effect. The pattern after transfer printing is a ring of ink around the main body portion 10. After transfer printing, the ink layer is baked, and then the finished product is cleaned to remove surface dust and other impurities. A film is applied to the first inner surface 1b of the main body portion 10 to protect it from ink contamination. Then, the second section 20b and the third section 20c of the edge portion 20 are sprayed, followed by spraying the outer surface 21, bottom surface 23, and second arc surface 22 of the edge portion 20, and pre-baking is performed. After spraying, for parts exceeding the coating boundary, such as some ink coated on the main body 10, the ink is wiped off, and then a final bake is performed. Optionally, excess ink can be wiped off using ink cleaners or organic solvents such as alcohol or acetone. The ink cleaner is a mixed solvent made by mixing and emulsifying industrial washing oil, nonionic surfactants, organic acids, organic amines, and water according to a certain process.

[0111] Among them, the precision of the pad printing ink layer is higher than that of the spraying ink layer. First, an ink ring is formed by the first segment 20a of the pad printing edge 20 to determine the edge of the ink setting, thereby facilitating the subsequent spraying process.

[0112] When verifying the masking effect after ink layer coating, the cover plate 1 is typically placed face up on the white paper of the platform 3. "Face up" means that the light-emitting side of the cover plate 1 faces upwards, while the side facing away from the light-emitting side is in contact with the platform 3. Regarding... Figure 2In the illustrated embodiment, the cover plate 1 is illuminated by a light source from the side with the receiving groove. The light-emitting side of the cover plate 1 is blocked by a light-shielding plate 2. The white paper is inspected for halos 6 or light spots. If halos 6 are present, rework can be performed promptly. Compared to directly inspecting the display module 5, this method facilitates early detection of coating defects, allowing for timely loss mitigation. A schematic diagram of the inspection is shown below. Figure 9 As shown.

[0113] Specifically, when the thickness of cover plate 1 is 1.5mm-2.5mm, for example, the thickness of cover plate 1 can be 1.55mm, 1.6mm, 1.8mm, 2.0mm, 2.3mm, etc., the coating height of ink on the outer surface of edge portion 20 (including outer surface 21 and second arc surface 22) can be 0.55mm-0.9mm, and the ink thickness is greater than or equal to 6μm. The inspection data for different ink heights are shown in the table below:

[0114] Serial Number Ink height (mm) Light transmission 1 0.534 Halo 6 Transparency NG 2 0.54-0.553 Halo 6 Transparency NG 3 0.535 Halo 6 Transparency NG 4 0.576 No halo 6OK 5 0.589 No halo 6OK 6 0.613 No halo 6OK 7 dotted ink gaps dotted light spots

[0115] The test data shows that ink heights below 0.55 mm have visible halo defects (6), while those above 0.57 mm have no light leakage. Products with abnormal light leakage in the straight position can be detected through the light box (with white paper placed under fixture 4).

[0116] To further ensure product yield, before module shipment, a 4-point light inspection is performed on the module edges to check for light leakage. Determination is based on the presence or absence of a halo effect, and any defects such as dotted, blocky, or striped defects are not permitted. A schematic diagram of the inspection device is shown below. Figure 10 As shown.

[0117] A second aspect of this application provides a display device, which includes the cover plate 1 described above.

[0118] In the display device of this application embodiment, a light-shielding layer 30 is provided on the outer side 21 of the cover plate 1, which can prevent light from being emitted from the edge portion 20, thereby solving the problem of light leakage from the edge portion 20 and the formation of halo 6.

[0119] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0120] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0121] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A cover plate, characterized in that, The cover plate includes a main body and an edge portion extending circumferentially from the main body away from the center of the main body. The orthographic projection of the main body along the thickness direction of the cover plate coincides with the orthographic projection of the display area of ​​the display module along the thickness direction of the cover plate. A light-shielding layer is provided on the outer side of the edge portion. The edge portion is a bent portion extending circumferentially from the main body portion away from the center of the main body portion, so that the cover plate has a receiving groove. The cover plate includes a first outer surface, a first inner surface opposite to the first outer surface, and a bottom surface connecting the first outer surface and the first inner surface. The first outer surface is the surface where the light-emitting side is located. The first outer surface of the main body portion includes a first plane and a first arc surface located on both sides of the first plane. The first arc surface extends in a direction close to the bottom surface. The first outer surface of the edge portion includes a second arc surface connected to the first arc surface and an outer surface connected to the second arc surface and the bottom surface. The first inner surface of the edge portion includes a first segment connected to the main body portion and a second segment and a third segment connected sequentially to the first segment. The first segment is a horizontal surface, the second segment is an arc surface, and the third segment is a plane and perpendicular to the first segment. Along the thickness direction of the cover plate, the portion of the second arc surface lower than the first segment is provided with a light-shielding layer.

2. The cover plate according to claim 1, characterized in that, The outer surface is a plane and is perpendicular to the first plane.

3. The cover plate according to claim 1, characterized in that, The height of the outer side is 0.5 to 0.8 times the thickness of the cover plate.

4. The cover plate according to claim 1, characterized in that, The first segment, the second segment, and the third segment are provided with the light-shielding layer.

5. The cover plate according to claim 1, characterized in that, The bottom surface is provided with the light-shielding layer.

6. The cover plate according to claim 1, characterized in that, The arc length of the portion of the second arc surface with the light-shielding layer does not exceed 1 / 2 of the arc length of the second arc surface that is lower than that of the first segment.

7. The cover plate according to claim 4, characterized in that, The light-shielding layer of the first segment is set by pad printing, while the light-shielding layers of the second and third segments are set by spraying.

8. The cover plate according to any one of claims 1-7, wherein the light-shielding layer is an ink layer, and the thickness of the ink layer is greater than or equal to 6 μm.

9. A method for manufacturing a cover plate, used to manufacture the cover plate according to any one of claims 1-8, characterized in that, Includes the following steps: The cover plate is provided, the cover plate includes a main body portion and an edge portion extending circumferentially from the main body portion away from the center of the main body portion, the orthographic projection of the main body portion along the thickness direction of the cover plate coincides with the orthographic projection of the display area of ​​the display module along the thickness direction of the cover plate; A protective film is affixed to the outer surface of the main body of the cover plate; A light-shielding layer is sprayed onto the outer surface of the edge portion and the second arc surface; The light-shielding layer is pre-baked; Wipe away excess light-shielding layer so that the outer side of the edge portion is provided with light-shielding layer, and along the thickness direction of the cover plate, the portion of the second arc surface lower than the first segment is provided with light-shielding layer; The light-shielding layer is then subjected to a final baking process.

10. The method for manufacturing a cover plate according to claim 9, characterized in that, Before the step of spraying a light-shielding layer onto the outer surface of the edge portion, the method further includes: The light-shielding layer is printed on the first section using a pad printing machine; The light-shielding layer after pad printing is then baked in a final oven. Clean the cover plate; A protective film is affixed to the first inner surface of the main body. The light-shielding layer is sprayed onto the second section and the third section.

11. A display device, characterized in that, The display device includes a cover plate as claimed in any one of claims 1-8.

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