Display module and display device

Abstract

The invention discloses a display module and a display device. The display module comprises a display panel and a cover plate. The cover plate is arranged on one side of the display panel, the side, close to the display panel, of the cover plate is provided with a binding face, the binding face comprises a first plane and a first curved face connected to the peripheral side of the first plane, and the display panel is attached to the first plane and at least part of the first curved face; one end of the first curved surface is connected to the first plane, the other end of the first curved surface is bent towards one side close to the display panel, the first curved surface comprises a plurality of side curved surfaces and corner curved surfaces connected between two adjacent side curved surfaces, and a fitting arc area is arranged on one side, close to the first plane, of the first curved surface; in the attaching arc area, the average curvature radius of the corner curved surface in the area away from the side edge curved surface connected with the corner curved surface is larger than the average curvature radius of the corner curved surface in the area close to the side edge curved surface connected with the corner curved surface. According to the invention, the probability of wrinkles when the display panel and the corner curved surface are attached can be reduced.

Description

[0001] This application is a divisional application with application date of December 27, 2023, application number 202311825642.0, and invention name “Display module and display device”. Technical Field

[0002] The present invention relates to the field of display technology, and in particular to a display module and a display device. Background Art

[0003] With the change of people's aesthetic level and the development of mobile terminal products, people are gradually pursuing the appearance of mobile phone terminals with rounded curves. Many curved screen terminals have appeared in the market. At present, multi-curved screens have two curved sides, that is, hyperbolic. There are many hyperbolic products and technical research is becoming more and more perfect. However, quad-curved screens have the advantages of more beautiful curves, differentiated appearance and no borders on all four sides. They are gradually becoming a market hotspot. Quad-curved screens are also one of the inevitable trends in the development of mobile phone terminals.

[0004] In a four-curved screen, wrinkles are prone to occur in the curved area, especially in the corner area. Summary of the invention

[0005] Embodiments of the present invention provide a display module and a display device, which can reduce the probability of wrinkles on a four-curved display panel in the curved area.

[0006] An embodiment of the present invention provides a display module, comprising:

[0007] Display panel;

[0008] A cover plate, arranged at one side of the display panel, wherein a bonding surface is arranged at a side of the cover plate close to the display panel, wherein the bonding surface comprises a first plane and a first curved surface connected to a peripheral side of the first plane, and the display panel is bonded to the first plane and at least a portion of the first curved surface;

[0009] Among them, one end of the first curved surface is connected to the first plane, and the other end of the first curved surface is bent toward the side close to the display panel. The first curved surface includes multiple side curved surfaces and a corner curved surface connected between two adjacent side curved surfaces. A fitting arc area is provided on the side of the first curved surface close to the first plane; in the fitting arc area, the average curvature radius of the corner curved surface in the area away from the side curved surface to which it is connected is greater than the average curvature radius of the corner curved surface in the area close to the side curved surface to which it is connected.

[0010] In one embodiment of the present invention, within the fitting arc area, the corner curved surface includes a plurality of sub-portions, one end of each sub-portion is connected to the first plane, and the other end of each sub-portion extends in a direction away from the first plane;

[0011] Among them, the multiple sub-sections include a central sub-section, and the extension direction of the central sub-section has a preset angle with the boundary line between the corner curved surface and the side curved surface, and the preset angle includes 45°. In the fitting arc area, the average curvature radius of the central sub-section is greater than the average curvature radius of other sub-sections in the corner curved surface.

[0012] In one embodiment of the present invention, within the fitting arc area, the average radius of curvature of each of the sub-portions decreases as the distance between each of the sub-portions and the central sub-portion increases.

[0013] In an embodiment of the present invention, within the fitting arc area, the plurality of sub-portions further include a first sub-portion, a second sub-portion located between the first sub-portion and the side curved surface, and a third sub-portion located between the second sub-portion and the side curved surface, and in the same corner curved surface, the distance between the first sub-portion and the central sub-portion is smaller than the distance between the second sub-portion and the central sub-portion, and the distance between the second sub-portion and the central sub-portion is smaller than the distance between the third sub-portion and the central sub-portion;

[0014] Among them, the average radius of curvature of the first sub-section is greater than the average radius of curvature of the second sub-section, the average radius of curvature of the second sub-section is greater than the average radius of curvature of the third sub-section, and the difference between the average radius of curvature of the first sub-section and the average radius of curvature of the second sub-section is greater than the difference between the average radius of curvature of the second sub-section and the average radius of curvature of the third sub-section.

[0015] In an embodiment of the present invention, the second subsection is directly connected between the first subsection and the third subsection.

[0016] In one embodiment of the present invention, within the fitting arc area, the average curvature radius of the corner curved surface is greater than the average curvature radius of the side curved surface.

[0017] In one embodiment of the present invention, within the fitting arc area, the radius of curvature of the first curved surface in a direction away from the first plane remains unchanged;

[0018] Alternatively, in the fitting arc area, a curvature radius of the first curved surface on a side away from the first plane is smaller than a curvature radius of the first curved surface on a side close to the first plane.

[0019] In one embodiment of the present invention, the first curved surface further includes at least one non-fitting arc area located on a side of the fitting arc area away from the first plane, and an average curvature radius of the first curved surface in the fitting arc area is greater than an average curvature radius of the first curved surface in the non-fitting arc area;

[0020] The display panel is bonded to the first plane and the first curved surface in the bonding arc area, and the edge of the display panel does not exceed the boundary line between the bonding arc area and the non-bonding arc area.

[0021] In one embodiment of the present invention, the first curved surface includes a plurality of non-bonding arc areas arranged on the side of the bonding arc area away from the first plane, and between two adjacent non-bonding arc areas, the average curvature radius of the first curved surface in one of the non-bonding arc areas close to the bonding arc area is greater than the average curvature radius of the first curved surface in one of the non-bonding arc areas away from the bonding arc area.

[0022] In one embodiment of the present invention, the number of the non-fitting arc areas at the corner curved surface is less than or equal to the number of the non-fitting arc areas at the side curved surface.

[0023] In one embodiment of the present invention, the number of the non-fitting arc areas of the corner curved surface away from the side curved surface connected thereto is less than the number of the non-fitting arc areas of the corner curved surface close to the side curved surface connected thereto.

[0024] In one embodiment of the present invention, in the direction away from the first plane along the fitting arc area, the rate of change of the curvature radius of the first curved surface in the fitting arc area is smaller than the rate of change of the curvature radius of the first curved surface in the two adjacent non-fitting arc areas.

[0025] In one embodiment of the present invention, the radius of curvature of the first curved surface in the fitting arc area is greater than or equal to 1.5 mm, and the radius of curvature of the first curved surface in the non-fitting arc area is greater than or equal to 0.5 mm.

[0026] In an embodiment of the present invention, a side of the cover plate away from the display panel is provided with an appearance surface, and the appearance surface includes a second plane arranged opposite to the first plane and a second curved surface arranged opposite to the first curved surface, and the second plane is parallel to the first plane;

[0027] The second curved surface is parallel to the first curved surface, and the thickness of the cover plate is equal at all locations;

[0028] Alternatively, the second curved surface is not parallel to the first curved surface, the cover plate has a first thickness in an area corresponding to the corner curved surface away from the side curved surface connected thereto, and the cover plate has a second thickness in an area corresponding to the corner curved surface close to the side curved surface connected thereto, and the first thickness is less than the second thickness.

[0029] In an embodiment of the present invention, the average radius of curvature of the second curved surface is greater than or equal to the average radius of curvature of the first curved surface.

[0030] In one embodiment of the present invention, one end of the first curved surface away from the first plane extends along a first direction, and an angle between the first direction and a second direction is less than or equal to 90°, the second direction is a direction along the first plane pointing to the first curved surface, and the second direction is parallel to the first plane.

[0031] According to the above-mentioned purpose of the present invention, an embodiment of the present invention further provides a display device, and the display device includes the display module.

[0032] Beneficial effects of the present invention: The present invention makes a differentiated design for the curvature radius of the corner curved surface, so that the average curvature radius of the corner curved surface away from the side curved surface is larger than the average curvature radius of the corner curved surface close to the side curved surface, thereby reducing the compression of the display panel at the corner curved surface, and the closer to the center of the corner curved surface, the greater the degree of reduction in the compression of the display panel, thereby reducing the probability of wrinkles when the display panel and the corner curved surface are bonded together, thereby improving the yield rate of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0034] Figure 1 A schematic diagram of a partial structure of a display module provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the structure of a cover plate provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a display module provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the structure of a cover plate at a first curved surface provided by an embodiment of the present invention;

[0038] Figure 5 A curvature variation curve diagram of a corner curved surface in a fitting arc area provided by an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the distribution of the curvature radius of the first curved surface of the cover plate provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0042] The embodiment of the present invention provides a display module. Figure 1 and Figure 2 The display module includes a display panel 10 and a cover plate 20; the cover plate 20 is arranged on one side of the display panel 10, and a bonding surface 30 is arranged on the side of the cover plate 20 close to the display panel 10, and the bonding surface 30 includes a first plane 31 and a first curved surface 32 connected to the peripheral side of the first plane 31, and the display panel 10 is bonded with the first plane 31 and at least a portion of the first curved surface 32.

[0043] Among them, one end of the first curved surface 32 is connected to the first plane 31, and the other end is bent toward the side close to the display panel 10. The first curved surface 32 includes multiple side curved surfaces 321 and a corner curved surface 322 connected between two adjacent side curved surfaces 321. A fitting arc area 201 is provided on the side of the first curved surface 32 close to the first plane 31; within the fitting arc area 201, the average curvature radius of the corner curved surface 322 in the area away from the side curved surface 321 to which it is connected is greater than the average curvature radius of the corner curved surface 322 in the area close to the side curved surface 321 to which it is connected.

[0044] During the implementation and application process, the embodiment of the present invention makes a differentiated design for the curvature radius of the corner curved surface 322, so that in the fitting arc area 201, the average curvature radius of the corner curved surface 322 away from the side curved surface 321 is greater than the average curvature radius of the corner curved surface 322 close to the side curved surface 321, thereby reducing the compression of the display panel 10 at the corner curved surface 322, and the closer to the center of the corner curved surface 322, the greater the degree of reduction in the compression of the display panel 10, thereby reducing the probability of wrinkles when the display panel 10 and the corner curved surface 322 are fitted, thereby improving the yield rate of the display module.

[0045] Specifically, please continue to combine Figure 1 , Figure 2 and Figure 3 The display module includes a stacked display panel 10 and a cover plate 20, and the cover plate 20 is arranged on the light-emitting side of the display panel 10, wherein the edges of the cover plate 20 are bent toward one side of the display panel 10 to form a four-curved cover plate, and the display panel 10 is bonded to the flat part and the curved part of the cover plate 20 to form a four-curved display module, which can achieve a narrow-frame display effect.

[0046] In one embodiment, the display panel 10 may include a panel body, a polarizer attached between the panel body and the cover plate 20, a back plate arranged on the side of the panel body away from the cover plate 20, and a heat dissipation buffer composite layer (Super clean foam, SCF) arranged on the side of the back plate away from the panel body.

[0047] Furthermore, a fitting surface 30 is provided on the side of the cover plate 20 close to the display panel 10 , and an appearance surface 40 is provided on the side of the cover plate 20 away from the display panel 10 ; in one embodiment, the edges of the fitting surface 30 and the appearance surface 40 are both bent toward the side close to the display panel 10 .

[0048] The bonding surface 30 includes a first plane 31 and a first curved surface 32 connected to the periphery of the first plane 31 , and the display panel 10 is bonded to the first plane 31 and at least a portion of the first curved surface 32 , and the position where the display panel 10 is bonded to the first curved surface 32 forms a curved display portion.

[0049] In the embodiment of the present invention, the curvature radius of the first curved surface 32 is designed differently to improve the phenomenon that wrinkles are easily formed during the bonding process of the display panel 10 and the cover plate 20 .

[0050] Specifically, the first curved surface 32 includes a plurality of side curved surfaces 321 and a corner curved surface 322 connected between two adjacent side curved surfaces 321; in one embodiment, the first plane 31 may be a polygon, such as a rectangle, and the side curved surfaces 321 are connected to the sides of the first plane 31, and the corner curved surface 322 is connected to the corner between the two sides of the first plane 31, and thus the corner curved surface 322 is located between two adjacent side curved surfaces 321.

[0051] In an embodiment of the present invention, the display panel 10 is bonded to the bonding arc area 201 and the first plane 31. In the bonding arc area 201, the average curvature radius of the corner curved surface 322 is greater than the average curvature radius of the side curved surface 321. Since the display panel 10 is more likely to generate wrinkles at the corner position during the bonding process, the average curvature radius of the corner curved surface 322 is increased in an embodiment of the present invention so that when the display panel 10 is bonded at the corner curved surface 322, the compression amount can be reduced, thereby reducing the probability of wrinkles on the display panel 10 at the corner curved surface 322.

[0052] Furthermore, in an embodiment of the present invention, within the bonding arc area 201, the average curvature radius of the corner curved surface 322 in the area away from the side curved surface 321 connected to it is greater than the average curvature radius of the corner curved surface 322 in the area close to the side curved surface 321 connected to it, so that the average curvature radius is larger closer to the center position of the corner curved surface 322, and thus the display panel 10 closer to the center position of the corner curved surface 322 is compressed less during the bonding process, which can effectively reduce the probability of wrinkles on the display panel 10 at the corners, thereby improving the bonding yield of the display panel 10.

[0053] Further, in one embodiment, please continue to combine Figure 1 , Figure 2 as well as Figure 4 The corner curved surface 322 includes a plurality of sub-portions 320, one end of the sub-portion 320 is connected to the first plane 31, and the other end of the sub-portion 320 extends in a direction away from the first plane 31; wherein, the plurality of sub-portions 320 include a central sub-portion 3224, one end of the central sub-portion 3224 is connected to the first plane 31, and the other end of the central sub-portion 3224 extends in a direction away from the first plane 31, and an extension direction of the central sub-portion 3224 has a preset angle with a boundary line between the corner curved surface 322 and the side curved surface 321, and within the fitting arc area 201, an average curvature radius of the central sub-portion 3224 is greater than an average curvature radius of other sub-portions 320 in the corner curved surface 322.

[0054] In one embodiment, the preset angle includes 45°, the angle between the two boundary lines between the same corner surface 322 and the side surfaces 321 on both sides can be 90°, and the average curvature radius of the corner surface 322 is largest when the angle between its extension direction and the boundary line between the corner surface 322 and the side surface 321 is 45°.

[0055] In other embodiments of the present invention, the preset angle may also include any other angles except 0° and 360°, and the embodiment of the present invention takes the preset angle of 45° as an example for description.

[0056] In one embodiment, within the fitting arc area 201, the radius of curvature of each sub-portion 320 decreases as the distance between each sub-portion 320 and the central sub-portion 3224 increases; it can be understood that the distance between each sub-portion 320 and the central sub-portion 3224 in the corner curved surface 322 can be the central arc length along the corner fan-shaped area in the top view.

[0057] It should be noted that the average radius of curvature of the corner surface 322 gradually increases from the edge of the corner toward the center of the corner, and the degree of increase can be larger and larger, that is, the rate of change of the average radius of curvature can be larger and larger. This is because the closer to the center of the corner, the greater the compression of the display panel 10 during the bonding process. For example, a Gaussian surface needs to be bonded to form a Gaussian surface. In the embodiment of the present invention, the rate of change of the average radius of curvature of the corner surface 322 is increased, so that the average radius of curvature of the corner surface 322 increases faster when it is closer to the center of the corner, so as to more effectively reduce the probability of wrinkles on the display panel 10 at the corner.

[0058] Specifically, in one embodiment, please combine Figure 1 , Figure 2 as well as Figure 4 , within the fitting arc area 201, the multiple sub-portions 320 also include a first sub-portion 3221, a second sub-portion 3222 and a third sub-portion 3223, wherein, in the same corner curved surface 322, the second sub-portion 3222 is located between the first sub-portion 3221 and the side curved surface 321, the third sub-portion 3223 is located between the second sub-portion 3222 and the side curved surface 321, the distance between the first sub-portion 3221 and the central sub-portion 3224 is smaller than the distance between the second sub-portion 3222 and the central sub-portion 3224, and the distance between the second sub-portion 3222 and the central sub-portion 3224 is smaller than the distance between the third sub-portion 3223 and the central sub-portion 3224.

[0059] Furthermore, the average curvature radius of the first sub-portion 3221 is greater than the average curvature radius of the second sub-portion 3222, the average curvature radius of the second sub-portion 3222 is greater than the average curvature radius of the third sub-portion 3223, and the difference between the average curvature radius of the first sub-portion 3221 and the average curvature radius of the second sub-portion 3222 is greater than the difference between the average curvature radius of the second sub-portion 3222 and the average curvature radius of the third sub-portion 3223. Among them, the second sub-portion 3222 can be directly connected between the first sub-portion 3221 and the third sub-portion 3223, which means that in the corner curved surface 322, the closer to the center of the corner, the faster its average curvature radius increases, so as to more effectively reduce the probability of wrinkles generated at the corner of the display panel 10.

[0060] It should be noted that, within the fitting arc area 201, the first sub-section 3221, the second sub-section 3222 and the third sub-section 3223 are merely three sub-sections 320 connected in the corner surface 322, and the relationship among the average radii of curvature of the plurality of sub-sections 320 can be set with reference to the first sub-section 3221, the second sub-section 3222 and the third sub-section 3223.

[0061] In one embodiment, please combine Figure 1 , Figure 2 ,as well as Figure 6 , in the fitting arc area 201, when the change curve of the average curvature radius of the corner curved surface 322 changes smoothly, the corner curved surface 322 includes a first position A, a second position B1 and B2, a third position C1 and C2, and a fourth position D1 and D2; wherein, between the fourth position D1 and the first position A, the average curvature radius of the corner curved surface 322 gradually increases, and the rate of change of the average curvature radius also gradually increases; between the first position A and the fourth position D2, the average curvature radius of the corner curved surface 322 gradually decreases, and the average curvature radius The rate of change of the radius also gradually decreases, and the average curvature radius of the fourth positions D1 and D2 can be equal to the average curvature radius of the side curved surface 321; further, the angle between the third position C1 and the fourth position D1, the angle between the second position B1 and the third position C1, the angle between the first position A and the second position B1, the angle between the first position A and the second position B2, the angle between the second position B2 and the third position C2, and the angle between the third position C2 and the fourth position D2 can all be 15°.

[0062] The width of each sub-portion 320 can be selected according to actual needs. In the embodiment of the present invention, the length of each sub-portion 320 in the direction of the extension of the arc length of the corner fan-shaped area in the top view can be made small enough so that the change curve of the average curvature radius of the corner curved surface 322 changes smoothly, such as Figure 5As shown, the ordinate represents the average curvature radius of the corner surface 322, and the abscissa represents different positions in the corner surface 322. Figure 4 and Figure 5 , 0° in the horizontal axis can be the fourth position D1, and α in the horizontal axis is the angle α between other positions in the corner surface 322 and the fourth position D1, for example, 15° can be the third position C1, 30° can be the second position B1, 45° can be the first position A, etc., 60° can be the second position B2, 75° can be the third position C2, and 90° can be the fourth position D2. Further, the peak of the curve corresponds to the curvature radius of the corner surface 322 at the center of the corner, and the troughs on both sides of the curve correspond to the curvature radius of the corner surface 322 at the edge close to the side surface 321, thereby improving the fitting effect between the display panel 10 and the cover plate 20, as well as the display effect of the display module; it can be seen that Figure 5 The slope of the middle curve gradually increases in the direction approaching the center of the corner, that is, the rate of change of the average radius of curvature gradually increases in the direction approaching the center of the corner, so as to further reduce the compression of the display panel 10 near the center of the corner and improve the probability of wrinkles generated during the bonding process of the display panel 10.

[0063] In summary, in the embodiment of the present invention, the average curvature radius of the corner curved surface 322 is increased to reduce the probability of wrinkles on the display panel 10 at the corner during the bonding process. At the same time, the average curvature radius of the corner curved surface 322 is set to gradually increase from the corner edge toward the corner center to further reduce the compression of the display panel 10 at the corner, and the compression of the display panel 10 gradually changes from the side curved surface 321 to the corner curved surface 322, and from the edge of the corner curved surface 322 to the center of the corner curved surface 322, and gradually increases. Therefore, on the basis of reducing the probability of the display panel 10 generating bonding wrinkles, poor bonding and optical anomalies caused by sudden changes in the cover plate morphology during bonding of the display panel 10 are avoided, thereby improving the yield rate and display effect of the display module.

[0064] Furthermore, since the embodiment of the present invention increases the average curvature radius of the corner curved surface 322 in the bonding arc area 201, the probability of wrinkles on the display panel 10 during the bonding process can be reduced. However, the increase in the average curvature radius of the corner curved surface 322 will cause the edge size of the cover plate 20 to increase, and thus cause the border width of the display module to increase, which will be detrimental to the four-curved display module to achieve a narrow border. Therefore, the embodiment of the present invention also designs the first curved surface 32 with a segmented arc.

[0065] Specifically, please combine Figure 1 and Figure 2The first curved surface 32 also includes at least one non-bonding arc area 202 located on the side of the bonding arc area 201 away from the first plane 31, wherein the average curvature radius R1 of the first curved surface 32 in the bonding arc area 201 is greater than the average curvature radius R2 of the first curved surface 32 in the non-bonding arc area 202.

[0066] In one embodiment of the present invention, the appearance surface 40 includes a second plane 41 arranged opposite to the first plane 31, and a second curved surface 42 arranged opposite to the first curved surface 32, and one end of the second curved surface 42 is connected to the second plane 41, and the other end of the second curved surface 42 is bent in a direction close to the display panel 10; wherein the second plane 41 is parallel to the first plane 31, and the second curved surface 42 is parallel to the first curved surface 32, and thus the average curvature radius of the second curved surface 42 is equal to the average curvature radius of the first curved surface 32, and the thickness of the cover plate 20 corresponding to the first curved surface 32 is uniform, and the thickness of the cover plate 20 is equal at all locations.

[0067] It can be understood that since the radius of curvature of the cover plate 20 in the fitting arc area 201 is greater than the radius of curvature of the cover plate 20 in the non-fitting arc area 202, and the radius of curvature of the second curved surface 42 is equal to the radius of curvature of the first curved surface 32, the second curved surface 42 will bulge away from the display panel 10 at a location with a larger curvature radius relative to a location with a smaller curvature radius. For example, the second curved surface 42 will bulge away from the display panel 10 in an area where the corresponding corner curved surface 322 is away from the side curved surface 321 connected to it, relative to the area where the corresponding corner curved surface 322 is close to the side curved surface 321 connected to it.

[0068] Furthermore, the display panel 10 is bonded to the first plane 31 and the bonding arc area 201, that is, the display panel 10 is bonded to the portion of the first curved surface 32 with a larger average curvature radius, and the average curvature radius of the non-bonded arc area 202 is reduced relative to the bonding arc area 201, that is, the average curvature radius of the second curved surface 42 away from the second plane 41 is also reduced, thereby reducing the edge size of the cover plate 20 and the frame width of the display module, which is beneficial for the four-curved display module to achieve a narrow frame.

[0069] The edge of the display panel 10 does not exceed the boundary between the bonding arc area 201 and the non-bonding arc area 202, and the arc length from the edge of the display panel 10 to the boundary between the bonding arc area 201 and the non-bonding arc area 202 is greater than or equal to 0.25 mm.

[0070] It can be understood that the number of non-bonding arc areas 202 can be multiple, and the multiple non-bonding arc areas 202 are arranged along the direction of the first plane 31 close to the bonding arc area 201, and between two adjacent non-bonding arc areas 202, the average curvature radius of the first curved surface 32 in a non-bonding arc area 202 close to the bonding arc area 201 is greater than the average curvature radius of the first curved surface 32 in a non-bonding arc area 202 away from the bonding arc area 201, that is, the curvature of the multiple bonding arc areas 202 gradually decreases along the direction of the bonding arc area 201 close to the non-bonding arc area 202, so that the edge of the cover plate 20 can be biased toward the vertical direction as soon as possible, so as to reduce the edge size of the cover plate 20 and the frame width of the display module, which is beneficial for the four-curved display module to achieve a narrow frame.

[0071] In one embodiment, when the size of each non-fitting area 202 in the direction away from the first plane 31 is small enough, the radius of curvature of the first curved surface 32 in the plurality of non-fitting arc areas 202 in the direction away from the first plane 31 gradually decreases.

[0072] Optionally, one end of the first curved surface 32 away from the first plane 31 extends along a first direction M, and the angle between the first direction M and the second direction N is less than or equal to 90°, the second direction N is a direction pointing to the first curved surface 32 along the first plane 31, and the second direction N is parallel to the first plane 31, and when the angle between the first direction M and the second direction N is 90°, the edge of the cover plate 20 will no longer extend outward, and the edge of the cover plate 20 transitions from a curved surface to a vertical state, which can improve the grip feel of the display panel.

[0073] In one embodiment, the number of non-fitting arc areas 202 at the corner curved surface 322 is less than or equal to the number of non-fitting arc areas 202 at the side curved surface 321, thereby enabling the average radius of curvature at the side curved surface 321 to decrease more quickly, thereby more effectively reducing the border width of the display module at each side, thereby realizing a narrow-border display module.

[0074] Furthermore, the number of non-fitting arc areas 322 at the corner curved surface 322 away from the side curved surface 321 connected to it is smaller than the number of non-fitting arc areas 321 at the corner curved surface 322 close to the side curved surface 321 connected to it, thereby allowing the border width of the display module to be gradually changed from the corner to the side, thereby avoiding uneven stress and poor appearance caused by sudden changes in the border width.

[0075] It should be noted that, in the embodiment of the present invention, in the bonding arc area 201, the radius of curvature of the first curved surface 32 does not change in the direction away from the first plane 31, that is, the radius of curvature of the first curved surface 32 in the bonding arc area 201 is uniform in the direction away from the first plane 31, thereby effectively improving the bonding yield of the display panel 10 in the bonding arc area 201. Alternatively, in the bonding arc area 201, the radius of curvature of the first curved surface 32 on the side away from the first plane 31 is smaller than the radius of curvature of the first curved surface 32 on the side close to the first plane 31, and the radius of curvature of the first curved surface 32 in the bonding arc area 201 gradually decreases in the direction away from the first plane 31, and in the direction away from the first plane 31 along the bonding arc area 201, the change rate of the radius of curvature of the first curved surface 32 in the bonding arc area 201 is smaller than the change rate of the radius of curvature of the first curved surface 32 in the two adjacent non-bonding arc areas 202.

[0076] Furthermore, when the curvature radii of the corner curved surface 322 in the bonding arc zone 201 are equal, the average curvature radius of the corner curved surface 322 in the bonding arc zone 201 can refer to the curvature radius of the corner curved surface 322 at any point in the bonding arc zone 201; when the curvature radii of the corner curved surface 322 in the bonding arc zone 201 are uneven, the average curvature radius of the corner curved surface 322 in the bonding arc zone 201 can be the average value of the curvature radii of the corner curved surface 322 in the bonding arc zone 201.

[0077] It can be understood that the average curvature radius defined in the non-fitting arc area 202 and the second curved surface 42 is the same as the average curvature radius defined in the fitting arc area 201, and will not be repeated here.

[0078] As mentioned above, the embodiment of the present invention increases the average curvature radius of the first curved surface 32 that is bonded to the display panel 10, thereby reducing the compression of the display panel 10 at the first curved surface 32. At the same time, the average curvature radius of the corner curved surface 322 is set to be larger than the average curvature radius of the side curved surface 321, and the average curvature radius of the corner curved surface 322 is set to gradually increase from the corner edge to the corner center, so as to further reduce the compression of the display panel 10 at the corner curved surface 322, thereby reducing the probability of the display panel 10 generating bonding wrinkles at the first curved surface 32, especially the corner curved surface 322, and improving the yield rate of the display panel. At the same time, the embodiment of the present invention sets a bonding arc area 201 with a larger average curvature radius and a non-bonding arc area 202 with a smaller average curvature radius in the first curved surface 32, thereby improving the bonding wrinkle phenomenon of the display module while reducing the border width of the display module to achieve a narrow-border display module.

[0079] Furthermore, in another embodiment of the present invention, the second plane 41 is parallel to the first plane 31, and the second curved surface 42 is not parallel to the first curved surface 32, and the average radius of curvature of the second curved surface 42 is greater than or equal to the average radius of curvature of the first curved surface 32. Specifically, the average radius of curvature of the second curved surface 42 may be equal to the average radius of curvature of the first curved surface 32 in the fitting arc area 201, and the average radius of curvature of the second curved surface 42 may be greater than the average radius of curvature of the first curved surface 32 in the non-fitting arc area 202, and the radius of curvature of the second curved surface 42 is uniform.

[0080] It should be noted that, in the present embodiment, the area of ​​the cover plate 20 corresponding to the corner curved surface 322 away from the side curved surface 321 connected thereto has a first thickness, and the area of ​​the cover plate 20 corresponding to the corner curved surface 322 close to the side curved surface 321 connected thereto has a second thickness, and the first thickness is less than the second thickness; further, the thickness of the cover plate 20 in the non-bonding arc area 202 is greater than the thickness of the cover plate 20 in other areas; that is, the smaller the radius of curvature corresponding to the first curved surface 32, the greater the thickness of the cover plate 20, and the portion of the cover plate 20 with increased thickness in the non-bonding arc area 202 is located on the side of the cover plate 20 close to the display panel 10, so that the second curved surface 42 of the cover plate 20 can maintain a uniform curvature, which is beneficial to improving the appearance and holding effect of the display panel.

[0081] In addition, since the curvature radius of the second curved surface 42 remains consistent and the curvature radius of the first curved surface 32 in the non-bonding arc area 202 becomes smaller, the thickness of the cover plate 20 in the non-bonding arc area 202 can be increased, thereby improving the protection effect of the cover plate 20 on the side of the display module.

[0082] In one embodiment, the radius of curvature of the first curved surface 32 in the fitting arc area 201 is greater than or equal to 1.5 mm, and the radius of curvature of the first curved surface 32 in the non-fitting arc area 202 is greater than or equal to 0.5 mm.

[0083] Furthermore, the curvature radius of the first curved surface 32 in the bonding arc area 201 is greater than or equal to 3 mm and less than or equal to 5 mm, and the curvature radius of the first curved surface 32 in the non-bonding arc area 202 is greater than or equal to 1 mm; Figure 1 and Figure 6 The curvature radius of the corner curved surface 322 in the fitting arc area 201 at the first position A is greater than or equal to 3.3 mm.

[0084] In addition, an embodiment of the present invention further provides a display device, which includes the display module described in the above embodiment.

[0085] In one embodiment, the display device may include a mobile phone, a television, a computer, a tablet, and other large-screen display devices.

[0086] To summarize, in the embodiment of the present invention, the average curvature radius of the corner curved surface 322 is increased to reduce the probability of wrinkles at the corners of the display panel 10 during the bonding process. At the same time, the average curvature radius of the corner curved surface 322 in the bonding arc area 201 is set to gradually increase from the edge of the corner toward the center of the corner to further reduce the compression of the display panel 10 at the corner, and the compression of the display panel 10 gradually changes from the side curved surface 321 to the corner curved surface 322, and from the edge of the corner curved surface 322 to the center of the corner curved surface 322, and gradually increases. Therefore, on the basis of reducing the probability of bonding wrinkles on the display panel 10, poor bonding and optical anomalies caused by sudden changes in the cover plate morphology during bonding of the display panel 10 are avoided, thereby improving the yield rate and display effect of the display module.

[0087] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] A display module and a display device provided by an embodiment of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display module, characterized in that: include: Display panel; A cover plate, arranged at one side of the display panel, wherein a bonding surface is arranged at a side of the cover plate close to the display panel, wherein the bonding surface comprises a first plane and a first curved surface connected to a peripheral side of the first plane, and the display panel is bonded to the first plane and at least a portion of the first curved surface; One end of the first curved surface is connected to the first plane, and the other end of the first curved surface is bent toward a side close to the display panel. The first curved surface includes a plurality of side curved surfaces and a corner curved surface connected between two adjacent side curved surfaces. A fitting arc area is provided on a side of the first curved surface close to the first plane. In the fitting arc area, the corner curved surface includes a plurality of sub-portions, one end of each sub-portion is connected to the first plane, and the other end of each sub-portion extends in a direction away from the first plane; The multiple sub-portions include a central sub-portion, and the extension direction of the central sub-portion has a preset angle with the boundary line between the corner curved surface and the side curved surface, and the preset angle includes 45°. In the fitting arc area, the average curvature radius of the central sub-portion is greater than the average curvature radius of other sub-portions in the corner curved surface.

2. The display module according to claim 1, characterized in that: In the fitting arc area, the average radius of curvature of the corner curved surface in an area away from the side curved surface connected thereto is greater than the average radius of curvature of the corner curved surface in an area close to the side curved surface connected thereto.

3. The display module according to claim 1, characterized in that: In the fitting arc area, the average radius of curvature of each of the sub-portions decreases as the distance between each of the sub-portions and the central sub-portion increases.

4. The display module according to claim 1, characterized in that: In the fitting arc area, the plurality of sub-portions further include a first sub-portion, a second sub-portion located between the first sub-portion and the side curved surface, and a third sub-portion located between the second sub-portion and the side curved surface. In the same corner curved surface, the distance between the first sub-portion and the central sub-portion is smaller than the distance between the second sub-portion and the central sub-portion, and the distance between the second sub-portion and the central sub-portion is smaller than the distance between the third sub-portion and the central sub-portion. The difference between the average radius of curvature of the first sub-portion and the average radius of curvature of the second sub-portion is greater than the difference between the average radius of curvature of the second sub-portion and the average radius of curvature of the third sub-portion.

5. The display module according to claim 4, characterized in that: An average radius of curvature of the first sub-portion is greater than an average radius of curvature of the second sub-portion, and an average radius of curvature of the second sub-portion is greater than an average radius of curvature of the third sub-portion.

6. The display module according to claim 4, characterized in that: The second subsection is directly connected between the first subsection and the third subsection.

7. The display module according to claim 1, characterized in that: In the fitting arc area, the average curvature radius of the corner curved surface is greater than the average curvature radius of the side curved surface.

8. The display module according to any one of claims 1 to 7, characterized in that: In the fitting arc area, a curvature radius of a side of the first curved surface away from the first plane is smaller than a curvature radius of a side of the first curved surface close to the first plane.

9. The display module according to claim 8, characterized in that: The first curved surface further includes at least one non-fitting arc area located on a side of the fitting arc area away from the first plane, and an average curvature radius of the first curved surface in the fitting arc area is greater than an average curvature radius of the first curved surface in the non-fitting arc area; The display panel is bonded to the first plane and the first curved surface in the bonding arc area, and the edge of the display panel does not exceed the boundary line between the bonding arc area and the non-bonding arc area.

10. The display module according to claim 9, characterized in that: The first curved surface includes a plurality of non-bonding arc areas arranged on the side of the bonding arc area away from the first plane. Between two adjacent non-bonding arc areas, the average curvature radius of the first curved surface in one of the non-bonding arc areas close to the bonding arc area is greater than the average curvature radius of the first curved surface in one of the non-bonding arc areas away from the bonding arc area.

11. The display module according to claim 10, characterized in that: In the direction away from the first plane along the fitting arc area, the rate of change of the curvature radius of the first curved surface in the fitting arc area is smaller than the rate of change of the curvature radius of the first curved surface in two adjacent non-fitting arc areas.

12. The display module according to claim 10, characterized in that: The number of the non-fitting arc areas at the corner curved surface is less than or equal to the number of the non-fitting arc areas at the side curved surface.

13. The display module according to claim 10, characterized in that: The number of the non-fitting arc areas at the corner curved surface away from the side curved surface connected to it is less than the number of the non-fitting arc areas at the corner curved surface close to the side curved surface connected to it.

14. The display module according to claim 9, characterized in that: The curvature radius of the first curved surface in the fitting arc area is greater than or equal to 1.5 mm, and the curvature radius of the first curved surface in the non-fitting arc area is greater than or equal to 0.5 mm.

15. The display module according to claim 1, characterized in that: The cover plate is provided with an appearance surface on a side away from the display panel, and the appearance surface includes a second plane arranged opposite to the first plane and a second curved surface arranged opposite to the first curved surface, and the second plane is parallel to the first plane; The second curved surface is parallel to the first curved surface, and the thickness of the cover plate is equal at all locations; Alternatively, the second curved surface is not parallel to the first curved surface, the cover plate has a first thickness in an area corresponding to the corner curved surface away from the side curved surface connected thereto, and the cover plate has a second thickness in an area corresponding to the corner curved surface close to the side curved surface connected thereto, and the first thickness is less than the second thickness.

16. The display module according to claim 15, characterized in that: An average curvature radius of the second curved surface is greater than or equal to an average curvature radius of the first curved surface.

17. The display module according to claim 1, characterized in that: One end of the first curved surface away from the first plane extends along a first direction, and an angle between the first direction and a second direction is less than or equal to 90°. The second direction is a direction along the first plane pointing to the first curved surface, and the second direction is parallel to the first plane.

18. A display device, characterized in that: The display device comprises the display module according to any one of claims 1 to 17.

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