Cover plate and manufacturing method thereof, and display device

Abstract

The present disclosure provides a cover plate, a manufacturing method thereof, and a display device, wherein the cover plate is used to be attached to the light-emitting side of a display module; the cover plate includes a first surface for facing the light-emitting side and attached to the display module, the first surface at least includes a first area for exceeding the edge of the display module when attached to the display module, a blocking boss is provided in the first area, and the blocking boss is configured to retain a gap between the first surface and the edge of the display module when the first surface is attached to the display module. The cover plate, the manufacturing method thereof, and the display device provided by the present disclosure can improve the waterproof effect.

Description

Technical Field

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

[0002] With the development of science and technology and the continuous improvement of production technology, the production capacity and yield of flexible display modules have gradually climbed to a higher level. Flexible display module products tend to be diversified, multifunctional, and multi-purpose, and have gradually been integrated into daily life, industrial production, and high-tech intelligent manufacturing. Smart wearables, mobile phones and other products are becoming thinner and lighter, with a higher screen-to-body ratio, greater impact resistance, and more aesthetics, which are more concerned by consumers, especially with higher requirements for the use environment. The waterproof performance of the display module (MDL) is a necessary requirement for its multi-scenario and multi-functional use, but there is a problem of poor waterproof performance of the display module in related technologies. Summary of the invention

[0003] The embodiments of the present disclosure provide a cover plate and a manufacturing method thereof, and a display device, which can improve the waterproof performance of a display module.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] An embodiment of the present disclosure provides a cover plate for being attached to a light-emitting side of a display module; the cover plate includes a first surface for facing the light-emitting side and being attached to the display module, the first surface includes at least a first area for extending beyond an edge of the display module when attached to the display module, a blocking boss is provided in the first area, and the blocking boss is configured to retain a gap between the first surface and the edge of the display module when the first surface is attached to the display module.

[0006] Exemplarily, the cover plate is provided with a shading layer on the first surface, and at least a portion of the orthographic projection of the shading layer on the first surface covers the first area, and at least another portion can overlap with the orthographic projection of the display module on the first surface and is located between the display module and the cover plate, and the blocking boss is located on the side of the shading layer facing away from the first surface.

[0007] Exemplarily, the light shielding layer includes a first ink layer and a second ink layer which are stacked, wherein the first ink layer is located on the first surface, and the second ink layer is located on a side of the first ink layer away from the first surface.

[0008] Exemplarily, the shading layer includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate than the inner side in a direction parallel to the first surface; wherein the second ink layer retracts toward the outer side relative to the inner edge of the first ink layer, so that the first ink layer and the inner edge of the second ink layer form a first step, and when the display module and the cover plate are bonded together by an optical adhesive layer, the optical adhesive layer conformally covers the first step.

[0009] Exemplarily, the distance by which the second ink layer is retracted toward the outer side relative to the inner edge of the first ink layer is in the range of 0.15 to 0.2 micrometers.

[0010] Exemplarily, the light-shielding layer includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate in a direction parallel to the first surface than the inner side; wherein the second ink layer is flush with the outer edge of the first ink layer.

[0011] Exemplarily, the blocking boss includes at least a third ink layer and a fourth ink layer which are stacked, and the fourth ink layer is located on a side of the third ink layer away from the first surface; the blocking boss includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate in a direction parallel to the first surface than the inner side; the inner edges of the third ink layer and the fourth ink layer are retracted toward the outer side relative to the inner edges of the first ink layer and the second ink layer, and when the cover plate is attached to the display module, there is at least the gap between the inner edge of the third ink layer and the outer edge of the display module.

[0012] Exemplarily, the third ink layer is flush with the inner edge of the fourth ink layer, or the fourth ink layer retracts toward the outer side relative to the inner edge of the third ink layer.

[0013] Exemplarily, the fourth ink layer includes a second surface facing away from the first surface, the first surface has a first width along the direction from the inner side to the outer side, and the first width is configured to enable the bonding force between the waterproof adhesive layer and the second surface to be greater than or equal to a predetermined value.

[0014] Exemplarily, the third ink layer is flush with an outer edge of the fourth ink layer.

[0015] Exemplarily, outer edges of the first ink layer, the second ink layer, the third ink layer, and the fourth ink layer are flush.

[0016] Exemplarily, the outer edge of the first surface has a cut angle, wherein the orthographic projections of the light-shielding layer, the third ink layer, and the fourth ink layer on the first surface at least partially cover the cut angle.

[0017] Exemplarily, the inner edges of the third ink layer and the fourth ink layer are retracted toward the outer side by a distance greater than or equal to 0.5 mm relative to the inner edges of the first ink layer and the second ink layer.

[0018] Exemplarily, the film thickness of any one of the first ink layer, the second ink layer, the third ink layer and the fourth ink layer in a direction perpendicular to the first surface ranges from 6 to 10 microns.

[0019] The present disclosure also provides a display device, including:

[0020] A display module, the display module comprising a light emitting side;

[0021] And the cover plate as described above, a waterproof adhesive layer is coated on the first area, the waterproof adhesive layer conformally covers the blocking boss, fills the gap and covers the fitting gap between the display module and the cover plate.

[0022] Exemplarily, the waterproof adhesive layer includes a first portion covering the side of the blocking boss away from the first surface, and a second portion filling the gap and covering the fitting gap between the display module and the cover plate, wherein the thickness of the first portion in a direction perpendicular to the first surface is 0.2 to 0.5 mm.

[0023] Exemplarily, the blocking boss includes an inner side and an outer side, the outer side is closer to the edge of the cover plate in a direction parallel to the first surface than the inner side; the gap has a second width along a direction from the inner side to the outer side, and the second width is configured to enable the waterproof glue to completely fill the gap and fully fit with the side wall of the gap.

[0024] Exemplarily, the second width is greater than or equal to 0.5 mm.

[0025] The present disclosure also provides a method for manufacturing a cover plate, which is used to manufacture the cover plate as described above, and the method comprises:

[0026] Providing a cover substrate;

[0027] A blocking boss is formed at a position of the cover substrate corresponding to the first area.

[0028] Exemplarily, when the cover plate is provided with a light shielding layer on the first surface, the light shielding layer includes a first ink layer and a second ink layer stacked, and the blocking boss includes at least a third ink layer and a fourth ink layer stacked, in the method, forming a blocking boss at a position of the cover plate substrate corresponding to the first area specifically includes:

[0029] sequentially forming the first ink layer and the second ink layer on the first surface by screen printing;

[0030] The third ink layer and the fourth ink layer are sequentially formed on a side of the second ink layer away from the first surface by transfer printing.

[0031] The beneficial effects brought by the embodiments of the present disclosure are as follows:

[0032] The cover plate and its manufacturing method, and the display device provided by the embodiments of the present disclosure, by setting a blocking boss in the first area of ​​the cover plate beyond the outer edge of the display module, a step is formed between the blocking boss and the first surface of the cover plate, and the blocking boss can retain a gap between the edge of the display module after the cover plate and the display module are bonded together. In this way, when the waterproof glue is applied in the first area, the waterproof glue will at least partially cover the side of the blocking boss away from the first surface, at least partially fill the gap and cover the bonding gap between the display module and the cover plate, so that the formed waterproof glue layer is non-linear with the bonding position of the blocking boss and the first surface, which effectively prevents water vapor and the like from expanding toward the display module along the bonding position, thereby effectively improving the waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shown is a schematic plan view of a cover plate provided by an embodiment of the present disclosure;

[0034] Figure 2 Shown Figure 1 A local structure enlarged view;

[0035] Figure 3 The figure is a plan view of a cover plate and a display module after being attached to each other in one embodiment of the present disclosure;

[0036] Figure 4 Shown Figure 3 Middle B is a partial enlarged view;

[0037] Figure 5 Shown Figure 4 Partial cross-sectional view along the A'-A" line. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Before describing in detail the cover plate, the manufacturing method thereof, and the display device provided by the embodiments of the present disclosure, it is necessary to describe the related technologies as follows:

[0041] In the related art, the cover plate can be attached to the light-emitting side of the display module by optical glue, and the gap between the cover plate and the display module is sealed by applying waterproof glue on the edge of the cover plate to prevent water vapor from entering the display module. However, the inventors have found through research that the cover plate is usually provided with ink to prevent light leakage. If the waterproof glue is not attached tightly or other factors such as vibration cause the waterproof glue to adhere poorly, there will be a gap between the waterproof glue and the ink, and water vapor will enter the display module through the gap, causing the display module to be corroded by water vapor and become defective.

[0042] In order to improve the above problems, the embodiments of the present disclosure provide a cover plate and a manufacturing method thereof, and a display device, which can improve the waterproof performance of the product.

[0043] Figure 1 Shown is a schematic plan view of a cover plate provided by an embodiment of the present disclosure; Figure 2 Shown Figure 1 A local structure enlarged view; Figure 3The figure is a plan view of a cover plate and a display module after being attached to each other in one embodiment of the present disclosure; Figure 4 Shown Figure 3 Middle B is a partial enlarged view; Figure 5 Shown Figure 4 Partial cross-sectional view along the A'-A" line.

[0044] See also Figures 1 to 5 The cover plate (CG) provided in the embodiment of the present disclosure can be used to be attached to the light-emitting side of the display module (MDL). The cover plate 10 may include a first surface 11 (i.e., Figure 1 The first surface 11 at least includes a first area D that extends beyond the edge of the display module 20 when the first surface 11 is in contact with the display module 20, and a blocking boss 12 is provided in the first area D. The blocking boss 12 is configured to reserve a gap O between the first surface 11 and the edge of the display module 20 when the first surface 11 is in contact with the display module 20.

[0045] In the above solution, a blocking boss 12 is provided in the first area D where the cover plate 10 exceeds the outer edge of the display module 20. The blocking boss 12 is higher than the first surface 11 to form a step difference with the first surface 11. Figures 4 to 5 , the blocking boss 12 can retain a gap O between the edge of the display module 20 after the cover plate 10 and the display module 20 are bonded. In this way, when the waterproof glue is applied in the first area D, the waterproof glue will at least partially cover the side of the blocking boss 12 away from the first surface 11, at least partially fill the gap O and cover the bonding gap between the display module 20 and the cover plate 10, so that the bonding position of the formed waterproof glue layer 30 with the blocking boss 12 and the first surface 11 is non-linear, that is, the bonding path of the waterproof glue layer 30 with the blocking boss 12 and the first surface 11 includes at least one corner position, which is equivalent to extending the bonding width of the waterproof glue layer 30 with the first area D, so as to effectively prevent water vapor and the like from expanding toward the display module 20 along the above-mentioned bonding position, thereby effectively improving the waterproof performance.

[0046] In some exemplary embodiments, Figures 1 to 5 As shown, the cover plate 10 is provided with a light shielding layer 13 on the first surface 11, and at least a part of the orthographic projection of the light shielding layer 13 on the first surface 11 covers the first area D, and at least another part can overlap with the orthographic projection of the display module 20 on the first surface 11 and is located between the display module 20 and the cover plate 10, that is, the light shielding layer 13 at least covers the first area D and at least partially extends to between the display module 20 and the cover plate 10 ( Figure 4 The light shielding layer 13 is shown to extend beyond the outer edge 20 ′ of the display module to effectively prevent light leakage. The blocking boss 12 is located on a side of the light shielding layer 13 that is away from the first surface 11 .

[0047] In some exemplary embodiments, Figures 3 to 5 As shown, the light shielding layer 13 includes a first ink layer 131 and a second ink layer 132 stacked, wherein the first ink layer 131 is located on the first surface 11, and the second ink layer 132 is located on the side of the first ink layer 131 away from the first surface 11. In the above scheme, the light shielding layer 13 uses at least two ink layers, and the formation process is simple, which can meet the light shielding effect and the film thickness can meet the requirements. The thickness of each ink layer can be 6 to 10 microns. Figure 5 As shown, the cover plate 10 and the display module 20 can be bonded together via an optical adhesive layer 40, and the shading layer 13 is partially located between the cover plate 10 and the display module 20. Since the optical adhesive layer 40 has excellent fluidity, it can at least partially cover the area of ​​the shading layer 13 located between the display module 20 and the cover plate 10.

[0048] It should be noted that the light shielding layer 13 is not limited to the ink material, and the number of film layers of the ink layer in the light shielding layer 13 is not limited to two layers.

[0049] Furthermore, in some exemplary embodiments, Figure 5 As shown, the shading layer 13 includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate 10 than the inner side in a direction parallel to the first surface 11; wherein, the second ink layer 132 retracts toward the outer side relative to the inner edge of the first ink layer 131, so that the inner edges of the first ink layer 131 and the second ink layer 132 form a first step, and when the display module 20 and the cover plate 10 are bonded together through the optical adhesive layer (OCA) 40, the optical adhesive layer 40 conformally covers the first step.

[0050] By adopting the above scheme, the first ink layer 131 and the second ink layer 132 can be formed on the first surface 11 by screen printing or pad printing. Taking into account the tolerance of the printing process, if the inner edge of the second ink layer 132 exceeds the inner edge of the first ink layer 131, there will be a poor appearance such as jagged edges of the ink, and the waterproof effect will be affected. Therefore, the first ink layer 131 retracts outward at the inner edge relative to the second ink layer 132.

[0051] Exemplarily, the distance d3 that the second ink layer 132 retracts toward the outer side relative to the inner edge of the first ink layer 131 is in the range of 0.15 to 0.2 microns. The specific retraction distance can be determined according to the process capability of the printing equipment. In this way, by retracting the second ink layer 132 toward the outer side relative to the inner edge of the first ink layer 131, the situation in which the inner edge of the second ink layer 132 covers the first ink layer 131 can be avoided, thereby avoiding poor display.

[0052] Of course, it is understandable that in some exemplary embodiments not shown, the outer edges of the second ink layer 132 and the first ink layer 131 may also be flush. In other words, the outer edges of the second ink layer 132 and the first ink layer 131 are aligned.

[0053] Furthermore, in some exemplary embodiments, Figure 5 As shown, the blocking boss 12 at least includes a third ink layer 121 and a fourth ink layer 122 which are stacked, and the fourth ink layer 122 is located on the side of the third ink layer 121 away from the first surface 11, and the inner edges of the third ink layer 121 and the fourth ink layer 122 are retracted toward the outer side relative to the inner edges of the first ink layer 131 and the second ink layer 132, and when the cover plate 10 and the display module 20 are attached, there is at least the gap O between the inner edge of the third ink layer 121 and the outer edge of the display module 20.

[0054] In the above scheme, the blocking boss 12 can be formed by at least two ink layers, and the third ink layer 121 and the fourth ink layer 122 in the blocking boss 12 are retracted outward relative to the ink layer in the shading layer 13, and have the gap O between the outer edge of the display module 20, that is, at least two ink layers in the blocking boss 12 do not extend between the display module 20 and the cover plate 10, and have the gap O between the outer edge of the display module 20.

[0055] It should be noted that the gap O has a second width along the direction from the inner side to the outer side, and the second width is configured to enable the waterproof glue to be completely filled in the gap O and completely fit with the side wall of the gap O. This is because the waterproof glue has a certain surface tension. If the gap O is too small, it may cause the waterproof glue to not be completely filled into the gap O. Therefore, the gap O needs to have a sufficient width. The specific value of the second width can be greater than or equal to 0.5 mm. Of course, it is understandable that for different ink materials and waterproof glue materials, the second width of the gap O can be reasonably adjusted according to actual conditions.

[0056] Furthermore, in some embodiments, Figure 5 As shown, the blocking boss 12 includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate 10 in a direction parallel to the first surface 11 than the inner side; the third ink layer 121 is flush with the inner edge of the fourth ink layer 122, or the fourth ink layer 122 retracts relative to the inner edge of the third ink layer 121 toward the outer side.

[0057] With the above solution, the third ink layer 121 and the fourth ink layer 122 can be formed on the first surface 11 by screen printing or pad printing. Considering the tolerance of the printing process, if the inner edge of the fourth ink layer 122 exceeds the inner edge of the third ink layer 121, there will be a poor appearance such as jagged edges of the ink, and the waterproof effect will be affected. Therefore, the fourth ink layer 122 is retracted outward at the inner edge relative to the third ink layer 121. Of course, in Figure 5 In the illustrated embodiment, the inner edges of the third ink layer 121 and the fourth ink layer 122 may also be aligned.

[0058] Exemplarily, the distance that the fourth ink layer 122 retracts toward the outer side relative to the inner edge of the third ink layer 121 is in the range of 0.15 to 0.2 microns. The specific retraction distance can be determined according to the process capability of the printing equipment. In this way, by retracting the fourth ink layer 122 toward the outer side relative to the inner edge of the third ink layer 121, it is possible to avoid the situation where the inner edge of the fourth ink layer 122 covers the third ink layer 121, thereby avoiding the problem of poor adhesion with the waterproof adhesive, which affects the waterproof effect.

[0059] In addition, it should be noted that if the first width d2 of the fourth ink layer 122 is not large enough, the bonding force between it and the waterproof glue may be insufficient, thereby affecting the waterproof effect. Therefore, in some exemplary embodiments, the fourth ink layer 122 includes a second surface away from the first surface 11, and the first surface 11 has a first width d2 along the direction from the inner side to the outer side. The first width d2 is configured to enable the bonding force between the waterproof glue layer 30 and the second surface to be greater than or equal to a predetermined value. The specific value range of the first width d2 can be reasonably limited in practical applications according to the characteristics of both the ink material and the waterproof glue material.

[0060] In addition, it should be noted that the number of film layers of the ink layer of the blocking boss 12 is not limited to two layers. Considering the ink material and process costs, when the blocking boss 12 includes two ink layers, its waterproof effect can achieve a good waterproof effect. Therefore, in some embodiments, as shown in the figure, the blocking boss 12 may include two ink layers. The film thickness of any ink layer in the direction perpendicular to the first surface 11 ranges from 6 to 10 microns.

[0061] Of course, it is understandable that in actual application scenarios, according to the waterproof performance requirements of the product, the thickness and quantity of the ink layer on the blocking boss 12 can be adjusted to meet the waterproof performance requirements in different scenarios.

[0062] In addition, in some exemplary embodiments, the blocking boss 12 includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate 10 than the inner side in a direction parallel to the first surface 11; the outer edges of the third ink layer 121 and the fourth ink layer 122 are flush. Such a configuration can ensure a good appearance of the display product.

[0063] In addition, in some exemplary embodiments, the outer edges of the first ink layer 131, the second ink layer 132, the third ink layer 121 and the fourth ink layer 122 are flush, and the outer edge of the first surface 11 has a cut angle 14, wherein the orthographic projections of the shading layer 13, the third ink layer 121 and the fourth ink layer 122 on the first surface 11 at least partially cover the cut angle 14.

[0064] In the above solution, the existence of the cut corner 14 on the edge of the cover plate 10 may cause light leakage and other phenomena. In order to effectively improve the above problem, the ink layer may at least cover part of the cut corner 14. For example, the orthographic projections of the light shielding layer 13, the third ink layer 121 and the fourth ink layer 122 on the first surface 11 cover half the width of the cut corner 14. Theoretically, it is best for each ink layer to completely cover the cut corner 14. However, due to the tolerance of the printing process, each ink layer may cover half the width of the cut corner 14 to prevent light leakage at the cut corner 14.

[0065] In addition, it should be noted that the inner edges of the third ink layer 121 and the fourth ink layer 122 are retracted toward the outer side by a distance d4 greater than or equal to 0.5 mm relative to the inner edges of the first ink layer 131 and the second ink layer 132.

[0066] By adopting the above scheme, the inner edges of the third ink layer 121 and the fourth ink layer 122 are retracted outward relative to the first ink layer 131 and the second ink layer 132. The amount of retraction can be adjusted according to the size of the display module 20 and the overall design. Considering the fitting tolerance, material shape tolerance and printing process tolerance, etc., the amount of retraction can be above 0.5 mm.

[0067] In addition, in some embodiments, the first ink layer 131 can be printed using a screen printing process, with the center of the cover plate 10 as the positioning reference, and a printing accuracy of ±0.15mm; and the second, third, and fourth ink layers, taking into account the need to cover the outer edge cut corner 14 of the cover plate 10, if the screen printing process is used, the printing accuracy of the process is limited, which will lead to poor coverage and light leakage (white edge leakage). Therefore, the second, third, and fourth ink layers can be printed using a pad printing process with a pad printing accuracy of ±0.15mm.

[0068] In addition, in order to prevent the second ink layer 132 from covering or exceeding the first ink layer 131, the inner edge of the second ink layer 132 can be retracted outward by a distance d3 of 0.2±0.15 microns relative to the inner edge of the first ink layer 131; the third and fourth ink layers can be retracted outward by a distance d4 of 1.5±0.25 mm relative to the inner edge of the first ink layer 131. The specific retraction distances d3 and d4 are related to the overall design and module fitting, and can be adjusted according to actual conditions. The thickness of a single ink layer is about 6 to 10 microns, and the total thickness of the four ink layers is about 24±6 microns.

[0069] In addition, the waterproof adhesive layer 30 includes a first portion 31 covering the side of the blocking boss 12 away from the first surface 11, and a second portion 32 filling the gap and covering the fitting gap between the display module 20 and the cover plate 10, wherein the thickness of the first portion 31 in a direction perpendicular to the first surface 11 is 0.2 to 0.5 mm.

[0070] In the above scheme, the waterproof adhesive layer 30 is coated on the blocking boss 12 with a thicker film layer, which is mainly used to adhere to the middle frame of the display device and play a supporting role. When the waterproof adhesive layer 30 is coated, the excess adhesive will naturally flow into the gap O between the display module 20 and the blocking boss 12 along the step formed by the step difference between the blocking boss 12 and the display module 20, and fill the gap O between the two. Exemplarily, the thickness of the first part 31 in the direction perpendicular to the first surface 11 is 0.2-0.5 mm, and the width of the first part 31 is the same as the width of the blocking boss 12.

[0071] It should be noted that, in the cover plate 10 in one embodiment of the present disclosure, the blocking boss 12 is flat on the side away from the first surface 11. In other embodiments not shown, in order to increase the fitting path of the waterproof glue, the blocking boss 12 may also be concave-convex on the side away from the first surface 11. For example, the fourth ink layer 122 may be divided into two spaced-apart parts from the outside to the inside. At this time, there may be a gap between the two parts, and the waterproof glue may be covered in the gap to increase the length of the waterproof glue fitting path; or, in an embodiment not shown, if the first area D has a sufficiently large width from the outside to the inside, the third ink layer 121 and the fourth ink layer 122 may be divided into two spaced-apart parts from the outside to the inside, thereby increasing the length of the waterproof glue fitting path.

[0072] In addition, if Figures 3 to 5 As shown, the embodiment of the present disclosure further provides a display device, including: a display module 20 and a cover plate 10, wherein the display module 20 includes a light emitting side, and the cover plate 10 adopts the cover plate 10 provided by the embodiment of the present disclosure, and a waterproof adhesive layer 30 is coated on the first area D, and the waterproof adhesive layer 30 conformally covers the blocking boss 12, fills the gap, and covers the fitting gap between the display module 20 and the cover plate 10.

[0073] Exemplarily, the waterproof adhesive layer 30 includes a first portion 31 covering the side of the blocking boss 12 away from the first surface 11, and a second portion 32 filling the gap and covering the fitting gap between the display module 20 and the cover plate 10, wherein the thickness of the first portion 31 in a direction perpendicular to the first surface 11 is 0.2 to 0.5 mm.

[0074] Exemplarily, the blocking boss 12 includes an inner side and an outer side, the outer side is closer to the edge of the cover plate 10 in a direction parallel to the first surface 11 than the inner side; the gap O has a second width d1 along the direction from the inner side to the outer side, and the second width d1 is configured to enable the waterproof glue to completely fill the gap O and completely fit with the side wall of the gap O.

[0075] Exemplarily, the second width d1 is greater than or equal to 0.5 mm.

[0076] Obviously, the display device provided in the embodiment of the present disclosure can bring all the beneficial effects brought by the cover plate 10 provided in the embodiment of the present disclosure, which will not be described in detail here.

[0077] Also, see Figure 5In some embodiments, the display module 20 may include a polarizer (POL) 21, a display panel (PNL) 22, a heat dissipation film (SCF) 23, and a driving circuit board (FPC) 24, wherein the polarizer 21 is arranged on the light-emitting side of the display panel 22 and is bonded to the first surface 11 of the cover plate 10 (CG) through the optical adhesive layer (OCA) 40, the heat dissipation film (SCF) 23 is bonded to the non-light-emitting side of the display panel 22, and the driving circuit board 24 is used to drive the display panel 22, which is connected to the display panel 22 and is bonded to the side of the heat dissipation film 23 away from the display panel 22 after being bent.

[0078] In addition, the embodiment of the present disclosure further provides a method for manufacturing the cover plate 10, which is used to manufacture the cover plate 10 as described above, and the method includes:

[0079] Providing a cover plate 10 base;

[0080] A blocking boss 12 is formed at a position of the base of the cover plate 10 corresponding to the first area D.

[0081] Exemplarily, when the light shielding layer 13 includes a first ink layer 131 and a second ink layer 132 stacked, and the blocking boss 12 includes at least a third ink layer 121 and a fourth ink layer 122 stacked, in the method, forming the blocking boss 12 at a position corresponding to the first area D of the base of the cover plate 10 specifically includes:

[0082] The first ink layer 131 and the second ink layer 132 are sequentially formed on the first surface 11 by screen printing;

[0083] The third ink layer 121 and the fourth ink layer 122 are sequentially formed on the side of the second ink layer 132 away from the first surface 11 by transfer printing.

[0084] By adopting the above scheme, the first ink layer 131 can be printed by screen printing process with the center of the cover plate 10 as the positioning reference, and the printing accuracy is ±0.15mm; and the second, third and fourth ink layers are considered to cover the outer edge cut corner 14 of the cover plate 10. If the screen printing process is adopted, the coverage effect is not good due to the printing accuracy limitation of the process, and light leakage (white edge leakage) occurs. Therefore, the second, third and fourth ink layers can be printed by pad printing process with a pad printing accuracy of ±0.15mm.

[0085] In addition, in order to prevent the second ink layer 132 from covering or exceeding the first ink layer 131, the inner edge of the second ink layer 132 can be retracted outward by 0.2±0.15 microns relative to the inner edge of the first ink layer 131; the third and fourth ink layers can be retracted outward by 1.5±0.25mm relative to the inner edge of the first ink layer 131. The specific retraction distance is related to the overall design and module fitting, and can be adjusted according to actual conditions. The thickness of a single ink layer is about 6 to 10 microns, and the total thickness of the four ink layers is about 24±6 microns.

[0086] There are a few points to note:

[0087] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0088] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0089] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0090] The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A cover plate, used to be attached to the light-emitting side of a display module; characterized in that: The cover plate includes a first surface for facing the light emitting side and being bonded to the display module, the first surface at least includes a first area for extending beyond the edge of the display module when being bonded to the display module, a blocking boss is provided in the first area, the blocking boss is configured to retain a gap between the first surface and the edge of the display module when being bonded to the display module, wherein when waterproof glue is applied in the first area, the waterproof glue at least partially conformally covers a side of the blocking boss away from the first surface, at least partially fills the gap and covers the bonding gap between the display module and the cover plate; the cover plate is provided with a shading layer on the first surface, at least a portion of the orthographic projection of the shading layer on the first surface covers the first area, and at least another portion can overlap with the orthographic projection of the display module on the first surface and is located between the display module and the cover plate, and the blocking boss is located on the side of the shading layer away from the first surface.

2. The cover plate according to claim 1, characterized in that: The light shielding layer includes a first ink layer and a second ink layer which are stacked, wherein the first ink layer is located on the first surface, and the second ink layer is located on a side of the first ink layer away from the first surface.

3. The cover plate according to claim 2, characterized in that: The light-shielding layer includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate than the inner side in a direction parallel to the first surface; wherein the second ink layer retracts toward the outer side relative to the inner edge of the first ink layer, so that the first ink layer and the inner edge of the second ink layer form a first step, and when the display module and the cover plate are bonded together by an optical adhesive layer, the optical adhesive layer conformally covers the first step.

4. The cover plate according to claim 3, characterized in that: The distance that the second ink layer retracts relative to the inner edge of the first ink layer toward the outer side is in a range of 0.15 to 0.2 micrometers.

5. The cover plate according to claim 3, characterized in that: The light shielding layer includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate than the inner side in a direction parallel to the first surface; wherein the second ink layer is flush with the outer edge of the first ink layer.

6. The cover plate according to claim 2, characterized in that: The blocking boss at least includes a third ink layer and a fourth ink layer which are stacked, and the fourth ink layer is located on a side of the third ink layer away from the first surface; the blocking boss includes an inner side and an outer side, and the outer side is closer to the edge of the cover plate in a direction parallel to the first surface than the inner side; the inner edges of the third ink layer and the fourth ink layer are retracted toward the outer side relative to the inner edges of the first ink layer and the second ink layer, and when the cover plate is attached to the display module, there is at least the gap between the inner edge of the third ink layer and the outer edge of the display module.

7. The cover plate according to claim 6, characterized in that: The inner edge of the third ink layer is flush with the inner edge of the fourth ink layer, or the fourth ink layer retracts toward the outer side relative to the inner edge of the third ink layer.

8. The cover plate according to claim 7, characterized in that: The fourth ink layer includes a second surface facing away from the first surface, the first surface has a first width along the direction from the inner side to the outer side, and the first width is configured to enable the bonding force between the waterproof adhesive layer and the second surface to be greater than or equal to a predetermined value.

9. The cover plate according to claim 6, characterized in that: The third ink layer is flush with an outer edge of the fourth ink layer.

10. The cover plate according to claim 9, characterized in that: Outer edges of the first ink layer, the second ink layer, the third ink layer, and the fourth ink layer are flush.

11. The cover plate according to claim 10, characterized in that: An outer edge of the first surface has a cut corner, wherein the orthographic projections of the light shielding layer, the third ink layer, and the fourth ink layer on the first surface at least partially cover the cut corner.

12. The cover plate according to claim 6, characterized in that: The inner edges of the third ink layer and the fourth ink layer are retracted toward the outer side by a distance greater than or equal to 0.5 mm relative to the inner edges of the first ink layer and the second ink layer.

13. The cover plate according to claim 6, characterized in that: The film thickness of any one of the first ink layer, the second ink layer, the third ink layer and the fourth ink layer in a direction perpendicular to the first surface ranges from 6 to 10 microns.

14. A display device, characterized in that: include: A display module, the display module comprising a light emitting side; And the cover plate as described in any one of claims 1 to 13, wherein a waterproof adhesive layer is coated on the first area, and the waterproof adhesive layer conformally covers the blocking boss, fills the gap and covers the fitting gap between the display module and the cover plate.

15. The display device according to claim 14, characterized in that: The waterproof adhesive layer includes a first portion covering a side of the blocking boss away from the first surface, and a second portion filling the gap and covering a fitting gap between the display module and the cover plate, wherein the thickness of the first portion in a direction perpendicular to the first surface is 0.2-0.5 mm.

16. The display device according to claim 14, characterized in that: The blocking boss includes an inner side and an outer side, the outer side is closer to the edge of the cover plate than the inner side in a direction parallel to the first surface; the gap has a second width along the direction from the inner side to the outer side, and the second width is configured to enable the waterproof glue to completely fill the gap and completely fit with the side wall of the gap.

17. The display device according to claim 16, characterized in that: The second width is greater than or equal to 0.5 mm.

18. A method for manufacturing a cover plate, characterized in that: For manufacturing the cover plate according to any one of claims 1 to 14, the method comprises: Providing a cover substrate; A blocking boss is formed at a position of the cover substrate corresponding to the first area.

19. The method according to claim 18, characterized in that When the cover plate is provided with a light shielding layer on the first surface, the light shielding layer includes a first ink layer and a second ink layer stacked, and the blocking boss includes at least a third ink layer and a fourth ink layer stacked, the method further includes: forming a blocking boss at a position of the cover plate substrate corresponding to the first area. sequentially forming the first ink layer and the second ink layer on the first surface by screen printing; The third ink layer and the fourth ink layer are sequentially formed on a side of the second ink layer away from the first surface by transfer printing.

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