Packaging cover plate, display module and display device

Abstract

The packaging cover plate, the display module and the display device provided by the embodiment of the present application relate to the technical field of display equipment and are used to solve the technical problem that the packaging cover plate in the prior art cannot well protect some display modules with different pressure resistance at two ends, thus when the 5ATM experiment is performed, the poor pressure resistance end of the display module after the test is prone to deformation, thereby affecting the quality of the display module. The packaging cover plate comprises a first surface and a second surface arranged oppositely, the first surface is a light exit surface, the first surface is a curved surface, the first surface comprises a first end portion and a second end portion, and the curvature of the first end portion is greater than the curvature of the second end portion. By setting the curvatures of the two ends of the first surface in the packaging cover plate to be different, the poor pressure resistance end of the display module can be better protected, thus the poor pressure resistance end of the display module after the test is not prone to bubbles, even deformation and screen breakage caused by interference with the whole machine.

Description

Technical Field

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

[0002] With the development of display device manufacturing technology, in order to improve their own strength, display modules usually have a cover plate on the display surface. In order to test the compressive strength of the display module, it is necessary to conduct a 5ATM test on the display module with the cover plate.

[0003] When conducting a 5ATM test on a display module, pressure needs to be applied to the cover plate. The pressure on the cover plate is transmitted to both ends of the display module. Since the two ends of some display modules have different pressure resistance, the end with poor pressure resistance is prone to air bubbles after the test, or even deformation and interference with the whole machine, causing screen breakage, thus affecting the quality of the display module. Summary of the Invention

[0004] In order to overcome the technical problems mentioned in the above technical background, this application provides a packaging cover plate, the packaging cover plate includes a first surface and a second surface disposed opposite to each other, the first surface is a light-emitting surface, the first surface is a curved surface, the first surface includes a first end and a second end, and the curvature of the first end is greater than the curvature of the second end.

[0005] In one possible implementation, the curvature at a critical location near the center of the first surface is less than the curvature near the first end and / or the second end;

[0006] Preferably, the curvature of the first surface gradually increases along a first direction from the critical position to the first end; and the curvature of the first surface gradually increases along a second direction from the critical position to the second end.

[0007] Preferably, starting from the critical position, the rate of change of curvature of the first surface along the first direction is greater than the rate of change of curvature along the second direction.

[0008] In one possible implementation, the first surface further includes a third end and a fourth end, the third end and the fourth end being symmetrical along a direction from the first end to the second end;

[0009] Along the third direction from the critical position to the third end, the curvature of the first surface gradually increases; along the fourth direction from the critical position to the fourth end, the curvature of the first surface gradually increases.

[0010] Preferably, starting from the critical position, the rate of change of curvature of the first surface along the third direction is equal to the rate of change of curvature along the fourth direction.

[0011] In one possible implementation, the thickness of both the first end and the second end is less than the thickness at the critical position;

[0012] Preferably, the thickness of the second end is greater than the thickness of the first end.

[0013] In one possible implementation, the thickness of the encapsulation cover gradually decreases along a first direction from the critical position to the first end; and along a second direction from the critical position to the second end.

[0014] In one possible implementation, the second face conforms to the shape of the first face.

[0015] In one possible implementation, the second surface includes a planar portion and an arcuate portion, the planar portion being close to the center of the second surface and the arcuate portion being located around the planar portion.

[0016] In one possible implementation, the second surface further includes a reinforcing portion located at the angle between the planar portion and the arcuate portion.

[0017] In one possible implementation, a display module includes a display panel and the encapsulation cover plate described in this application, wherein the encapsulation cover plate is disposed on the light-emitting side of the display panel, and an adhesive is filled between the display panel and the encapsulation cover plate.

[0018] In one possible implementation, an electronic device includes the display module described in this application.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] This application provides a packaging cover, a display module, and a display device. By setting the curvature of the two ends of the first surface of the packaging cover to be different, that is, the curvature of the first end of the first surface is greater than the curvature of the second end, when pressure is applied to the packaging cover, the first end with greater curvature will decompose more pressure into the horizontal direction. Finally, the force applied to the end of the display module with poor stress resistance is relatively smaller. Therefore, the end of the display module with poor stress resistance can be better protected, so it is less likely to cause air bubbles to appear on the end of the display module with poor stress resistance after testing, or even deformation and interference with the whole machine causing screen breakage. This can improve the quality of the display module. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a front view of the encapsulation cover provided in this embodiment;

[0023] Figure 2 This is a top view of the encapsulation cover plate provided in this embodiment;

[0024] Figure 3 This is a side cross-sectional view of the encapsulation cover provided in this embodiment;

[0025] Figure 4 This is one of the front cross-sectional views of the encapsulation cover provided in this embodiment;

[0026] Figure 5 This is the second front cross-sectional view of the encapsulation cover provided in this embodiment;

[0027] Figure 6 This is the third front cross-sectional view of the encapsulation cover provided in this embodiment;

[0028] Figure 7 This is the fourth front cross-sectional view of the encapsulation cover provided in this embodiment;

[0029] Figure 8 This is one of the schematic diagrams of the display module provided in this embodiment;

[0030] Figure 9 This is the second schematic diagram of the display module provided in this embodiment.

[0031] Reference numerals: 1. First end; 2. Encapsulation cover; 21. First surface; 22. Second surface; 3. Critical position; 4. Second end; 5. Third end; 6. Fourth end; 7. Flat part; 8. Angle; 9. Curved part; 10. Reinforcing part; 11. Adhesive; 12. Display panel. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] It should be noted that, where there is no conflict, different features in the embodiments of this application can be combined with each other.

[0037] Please see Figure 1 This application provides an encapsulation cover plate 2, which includes a first surface 21 and a second surface 22 disposed opposite to each other. The first surface 21 is a light-emitting surface and is curved. The first surface 21 includes a first end 1 and a second end 4, and the curvature of the first end 1 is greater than the curvature of the second end 4.

[0038] The encapsulation cover 2 is suitable for both flexible and rigid display modules, among other application scenarios. When the encapsulation cover 2 is installed on the light-emitting side of the display module, the second surface 22 is closer to the light-emitting side of the display module, while the first surface 21 is farther away. During a 5ATM test, the first surface 21 is the stress-bearing surface. Please refer again. Figure 1 During the 5ATM test, a uniform mechanical pressure F is applied to the encapsulation cover 2. When the mechanical pressure F is applied to the first surface 21, since the first surface 21 is an arc surface with a certain curvature, the mechanical pressure applied to the first surface 21 will be decomposed into a longitudinal force F. a and the first lateral force F b Second lateral force F c The encapsulation cover 2 is mainly subjected to the longitudinal force F. aThe longitudinal force F experienced by the encapsulation cover 2 a The force is then transmitted to the display module, therefore the longitudinal force F a The size of the enclosure directly determines the magnitude of the force exerted on the display module by the encapsulation cover plate 2.

[0039] Please see again Figure 1 The mechanical pressure F acting on the first end 1 is decomposed into a longitudinal force F at the first end. a1 And the lateral force F at the first end of the transverse direction b1 and the first end lateral force F c1 The mechanical pressure F acting on the second end 4 is decomposed into a longitudinal force F at the second end. a2 And the lateral force F at the second end of the transverse direction. b2 Second end lateral force F c2 Because a curved surface with a greater curvature decomposes the mechanical pressure F into a greater lateral force and a smaller longitudinal force, and because the curvature of the first end 1 is greater than that of the second end 4, the longitudinal force F at the first end is... a1 Less than the longitudinal force F at the second end a2 Therefore, the force exerted on the end of the display module corresponding to the first end 1 will be relatively smaller. Thus, when the encapsulation cover 2 is installed on the display module, the first end 1 corresponds to the end of the display module with relatively poor stress resistance. This provides better protection for the end of the display module with poor stress resistance, making it less likely for air bubbles to appear on the end with poor pressure resistance after testing, or even for deformation and interference with the whole device causing screen breakage. This, in turn, improves the quality of the display module.

[0040] In one possible implementation, please see again Figures 1-2 The curvature at a critical position 3 near the center of the first surface 21 is less than the curvature near the first end 1 and / or the second end 4. When the second surface 22 is on a horizontal plane, the highest point of the first surface 21 in space is the critical position 3, i.e. Figure 1 and Figure 2 Point L in the diagram. The curvature at the critical position 3 is set to be less than the curvature near the first end 1 and / or the second end 4, so that the top surface of the first surface 21 (at the critical position 3) is flatter, and therefore it is easier to apply mechanical pressure F to the first surface 21 during the 5ATM test, thus making it easier to conduct the 5ATM test.

[0041] Preferably, please see again. Figure 2 Along the first direction from the critical position 3 to the first end 1 ( Figure 2In the Q1 direction, the curvature of the first surface 21 gradually increases; along the second direction from the critical position 3 to the second end 4 ( Figure 2 In the Q2 direction (as shown in the image), the curvature of the first surface 21 gradually increases. Thus, along the first direction, the longitudinal force decomposed in the longitudinal direction gradually decreases, and therefore, the longitudinal force ultimately transmitted to the display module along the first direction gradually decreases. Similarly, along the second direction, the longitudinal force decomposed in the longitudinal direction gradually decreases, and therefore, the longitudinal force ultimately transmitted to the display module along the second direction gradually decreases. This makes it easier for the encapsulation cover 2 to withstand greater mechanical pressure, thus providing more effective protection for the display module.

[0042] Preferably, please see again. Figures 1-2 From the critical position 3, the rate of curvature change of the first surface 21 along the first direction is greater than the rate of curvature change along the second direction. That is, the rate of curvature change from the critical position 3 to the first end 1 is greater than the rate of curvature change from the critical position 3 to the second end 4, meaning the region from the critical position 3 to the second end 4 is more "gentle" than the region from the critical position 3 to the first end 1. Thus, within the range from the critical position 3 to the first end 1, the lateral force decomposed by mechanical pressure is greater, while the longitudinal force decomposed by mechanical pressure is smaller. Conversely, within the range from the critical position 3 to the second end 4, the lateral force decomposed by mechanical pressure is relatively smaller, while the longitudinal force decomposed by mechanical pressure is relatively larger. This provides better protection for areas in the corresponding display module that have a relatively lower pressure tolerance.

[0043] In one possible implementation, please see Figures 2-3 The first surface 21 also includes a third end 5 and a fourth end 6, which are symmetrical along the direction from the first end 1 to the second end 4. That is, the projection of the encapsulation cover 2 on the display module is symmetrical along the direction from the first end 1 to the second end 4, so the entire encapsulation cover 2 is "egg-shell-shaped" or "tortoise-shell-shaped", thus the entire encapsulation cover 2 has a stronger ability to withstand mechanical pressure.

[0044] Preferably, please see again. Figure 3 Along the third direction from the critical position 3 to the third end 5, the curvature of the first surface 21 gradually increases; along the fourth direction from the critical position 3 to the fourth end 6, the curvature of the first surface 21 gradually increases. Along both the third and fourth directions, the forces decomposed into lateral forces gradually increase, while the forces decomposed into longitudinal forces gradually decrease, thereby further enhancing the mechanical pressure resistance of the encapsulation cover 2.

[0045] Preferably, please see again. Figure 3 From the critical position 3, the rate of curvature change of the first surface 21 along the third direction is equal to the rate of curvature change along the fourth direction. That is, the smoothness of the region from the critical position 3 to the third end is the same as the smoothness of the region from the critical position 3 to the fourth end. Thus, the region from the critical position 3 to the third end and the region from the critical position 3 to the fourth end have essentially the same ability to withstand mechanical pressure, preventing damage to the entire encapsulation cover 2 from being damaged in one of these two regions.

[0046] In one possible implementation, please see Figure 4 The thicknesses of both the first end 1 and the second end 4 are less than the thickness at the critical position 3. That is... Figure 4 Since both D1 and D3 are smaller than D2, and the curvature at the critical position 3 is smaller than that at the first end 1 and the second end 4, the top region of the encapsulation cover 2 is flatter. Therefore, the mechanical pressure per unit area on the encapsulation cover 2 is greater than that per unit area at the first end 1 and the second end 4. Thus, designing the thickness at the critical position 3 to be greater than the thickness of the first end 1 and the second end 4 can improve the overall pressure resistance of the encapsulation cover 2.

[0047] Preferably, please refer to Figure 4 The thickness of the second end 4 is greater than the thickness of the first end 1. Since the curvature of the second end 4 is less than that of the first end 1, the longitudinal force on the second end 4 is greater than that on the first end 1. Therefore, designing the thickness of the second end 4 to be greater than that of the first end 1 can improve the pressure resistance of the second end 4, thereby further improving the pressure resistance of the entire encapsulation cover 2.

[0048] In one possible implementation, please see again Figure 4 Along the first direction from the critical position 3 to the first end 1, the thickness of the encapsulation cover 2 gradually decreases; along the second direction from the critical position 3 to the second end 4, the thickness of the encapsulation cover 2 gradually decreases. Since the curvature of the first surface 21 gradually increases along both the first and second directions, the longitudinal force on the encapsulation cover 2 gradually decreases along both directions. Therefore, by gradually reducing the thickness of the encapsulation cover 2 along both the first and second directions, the overall weight of the encapsulation cover 2 can be minimized while still meeting its compressive strength requirements.

[0049] In one possible implementation, please see Figure 5 The second surface 22 matches the shape of the first surface 21. This matching means that both the second surface 22 and the first surface 21 are curved surfaces, and the curvature at corresponding positions is the same, meaning the thickness of the entire encapsulation cover 2 is uniformly set. Thus, while meeting the pressure-bearing capacity requirements of the encapsulation cover 2, the entire encapsulation cover 2 is more aesthetically pleasing and lighter.

[0050] In one possible implementation, please see Figure 6 The second surface 22 includes a flat portion 7 and an arcuate portion 9. The flat portion 7 is located near the center of the second surface 22, and the arcuate portion 9 is located around the flat portion 7. Since the longitudinal component of the 5 ATM force per unit area is greater at the critical position 3 of the encapsulation cover plate 2, designing the position near the center of the second surface 22 as a flat surface increases the thickness at that position, thereby further improving the compressive strength at the flat portion 7 position, and consequently, further improving the overall compressive strength of the encapsulation cover plate 2. Furthermore, designing the flat portion facilitates the installation of the encapsulation cover plate 2 with the display module.

[0051] In one possible implementation, please see Figure 7 The second surface 22 further includes a reinforcing portion 10, which is located at the angle 8 between the flat portion 7 and the curved portion 9. An angle 8, concave towards the first surface 21, is formed at the junction of the flat portion 7 and the curved portion 9 in the second surface 22. This angle 8 is a weak point under stress, and the encapsulation cover 2 is prone to breakage at the angle 8 between the flat portion 7 and the curved portion 9 when subjected to pressure. Therefore, a reinforcing portion 10 is provided at the angle 8 between the flat portion 7 and the curved portion 9. Preferably, the reinforcing portion 10 is integrally formed with the second surface 22. The reinforcing portion 10 can greatly improve the stress-bearing capacity at the angle 8 between the flat portion 7 and the curved portion 9, preventing breakage at the angle 8 and thus rendering the entire encapsulation cover 2 unusable.

[0052] Based on the same inventive concept, in one possible implementation, this application also provides a display module, including a display panel 12 and the encapsulation cover plate 2 described in this application. The encapsulation cover plate 2 is disposed on the light-emitting side of the display panel 12, and an adhesive 11 is filled between the display panel 12 and the encapsulation cover plate 2.

[0053] The adhesive 11 can be selected from OCA / OCR special adhesives 11. Please refer to [link / reference]. Figures 8-9 , Figure 8 The second surface 22 of the encapsulation cover 2 described herein is an arc surface. Figure 9The second surface 22 of the encapsulation cover 2 includes a flat portion 7. The first end 1 of the encapsulation cover 2 is installed on the end of the display module with relatively poor stress resistance. When performing a 5ATM test, the mechanical pressure on the first end 1 of the encapsulation cover 2 is decomposed into a relatively smaller longitudinal force. Therefore, the longitudinal force acting on the end of the display module with relatively poor stress resistance is relatively smaller. Thus, the encapsulation cover 2 can better protect the end of the display module with relatively poor stress resistance, which is more conducive to performing a 5ATM test.

[0054] Based on the same inventive concept, in one possible implementation, this application also provides an electronic device, including the display module described in this application. The electronic device can be a television, video wall, mobile terminal, display area, or other device with display functionality.

[0055] In summary, by setting different curvatures at the two ends of the first surface 21 of the encapsulation cover plate 2—that is, the curvature of the first end 1 of the first surface 21 is greater than that of the second end 4—when pressure is applied to the encapsulation cover plate 2, the first end with greater curvature will decompose more pressure into the horizontal direction. Ultimately, the force applied to the end of the display module with poor stress resistance is relatively smaller. Therefore, the end of the display module with poor stress resistance can be better protected, making it less likely for air bubbles to appear on the end with poor stress resistance after testing, or even for deformation and interference with the whole device causing screen breakage. This improves the quality of the display module. Furthermore, because different curvatures are designed for different positions of the encapsulation cover plate 2 according to the actual situation of the display module, the overall pressure resistance of the encapsulation cover plate 2 can be improved, and it can achieve better drop resistance.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A sealing cover, characterized in that, The encapsulation cover includes a first surface and a second surface disposed opposite to each other. The first surface is a light-emitting surface and is curved. The first surface includes a first end and a second end, which are connected to each other. The curvature of the first end is greater than that of the second end. The longitudinal force exerted by the first end on the display module is less than that exerted by the second end on the display module. From the critical position to the first end, the curvature change rate of the first surface is a first curvature change rate. From the critical position to the second end, the curvature change rate of the first surface is the second curvature change rate, the first curvature change rate is greater than the second curvature change rate, and the critical position is the point where the distance between the first surface and the second surface is the largest and located at the highest point on the first surface.

2. The encapsulation cover plate according to claim 1, characterized in that, The curvature near the critical position is less than the curvature near the first end and / or the second end.

3. The encapsulation cover plate according to claim 2, characterized in that, Along a first direction from the critical position to the first end, the curvature of the first surface gradually increases; along a second direction from the critical position to the second end, the curvature of the first surface gradually increases.

4. The encapsulation cover plate according to claim 2, characterized in that, The first surface also includes a third end and a fourth end, the third end and the fourth end being symmetrical along the direction from the first end to the second end; The curvature of the first surface gradually increases along a third direction from the critical position to the third end; the curvature of the first surface gradually increases along a fourth direction from the critical position to the fourth end.

5. The encapsulation cover plate according to claim 4, characterized in that, From the critical position onwards, the rate of change of curvature of the first surface along the third direction is equal to the rate of change of curvature along the fourth direction.

6. The encapsulation cover plate according to claim 2, characterized in that, The thickness of both the first end and the second end is less than the thickness at the critical position.

7. The encapsulation cover plate according to claim 6, characterized in that, The thickness of the second end is greater than the thickness of the first end.

8. The encapsulation cover plate according to claim 7, characterized in that, The thickness of the encapsulation cover gradually decreases along a first direction from the critical position to the first end; the thickness of the encapsulation cover gradually decreases along a second direction from the critical position to the second end.

9. The encapsulation cover plate according to claim 1, characterized in that, The second surface has a shape that matches the first surface.

10. The encapsulation cover plate according to claim 1, characterized in that, The second surface includes a flat portion and an arcuate portion, the flat portion being close to the center of the second surface and the arcuate portion being located around the flat portion.

11. The encapsulation cover plate according to claim 10, characterized in that, The second surface also includes a reinforcing portion located at the angle between the planar portion and the curved portion.

12. A display module, characterized in that, The device includes a display panel and an encapsulation cover as described in any one of claims 1-11, wherein the encapsulation cover is disposed on the light-emitting side of the display panel, and an adhesive is filled between the display panel and the encapsulation cover.

13. An electronic device, characterized in that, Includes the display module as described in claim 12.

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