Flexible display module and cover plate bonding method of flexible display module

Abstract

The application provides a flexible display module and a cover plate bonding method of the flexible display module. The distance from each point on the first outer boundary of the first corner part of the display panel away from the first plane part to a fixed point on the first edge part is a first distance. The sinking distance of the first outer boundary relative to the first plane part is a second distance. The second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance. The first outer boundary is arranged inwards relative to the second outer boundary of the second corner part of the cover plate. The distance from the first outer boundary to the second outer boundary is a third distance. The third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance. The matching of the display panel and the cover plate is improved, so that when the display panel is bonded with the cover plate, the first corner part is prevented from being in contact with the cover plate before the first edge part, and wrinkles in the first corner part are avoided, thereby the problem that wrinkles are prone to occur at the Gaussian surface when the existing four-curved surface screen is bonded can be alleviated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a flexible display module and a cover plate bonding method of the flexible display module. BACKGROUND

[0002] With the development of display technology, curved screens have become a big hit in the current display field. The side curved radius of the curved screen can increase the display area and improve the screen ratio, providing users with a better sensory experience. The curved screen includes a double curved screen formed by the two opposite sides of the display screen having a certain bending radius, and a four curved screen formed by the four sides of the display screen each having a certain bending radius. The four curved screen has greater performance improvement in screen ratio and other aspects compared to the double curved screen. The four curved screen is usually formed by bonding a display panel and a cover plate with a curved surface together. For the four curved screen, the position where the two adjacent curved sides intersect forms a Gaussian surface, which is prone to wrinkles during bonding. SUMMARY

[0003] The present application provides a flexible display module and a cover plate bonding method of the flexible display module to alleviate the technical problem of wrinkles at the Gaussian surface during bonding of the existing four curved screen.

[0004] To solve the above problems, the technical solutions provided by the present application are as follows:

[0005] The present application provides a flexible display module, which includes a planar area and a curved area located outside the planar area; the flexible display module further includes:

[0006] a display panel, the display panel including a first planar part corresponding to the planar area and a first curved part corresponding to the curved area, the first curved part including a plurality of first edge parts and a first corner part connected between two adjacent first edge parts;

[0007] a cover plate provided on the light-emitting side of the display panel, the display panel and the cover plate being bonded together, the cover plate including a second planar part corresponding to the first planar part and a second corner part corresponding to the first corner part;

[0008] The first distance is a distance from each point on a first outer boundary of the first corner portion to a fixed point on the first edge portion, the first outer boundary is recessed relative to the first planar portion by a second distance, the second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance; the first outer boundary is arranged inwardly relative to a second outer boundary of the second corner portion away from the second planar portion, a third distance is a distance from the first outer boundary to the second outer boundary, the third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance.

[0009] In the flexible display module provided in the embodiments of the present application, the third distance changes with the first distance in a negative correlation with the second distance.

[0010] In the flexible display module provided in the embodiments of the present application, the curvature of the middle region of the first outer boundary is greater than the curvature of the two side regions.

[0011] In the flexible display module provided in the embodiments of the present application, the curvature of the middle region of the second outer boundary is greater than the curvature of the two side regions.

[0012] In the flexible display module provided in the embodiments of the present application, a first boundary line of the first corner portion and one of the first edge portions is a first boundary line, a second boundary line of the first corner portion and another of the first edge portions is a second boundary line, the first corner portion is equally divided into n parts, the first boundary line, the second boundary line and each of the equally divided lines intersect the first outer boundary at a first intersection point, and a recessed distance of each of the first intersection points relative to the first planar portion is the second distance.

[0013] In the flexible display module provided in the embodiments of the present application, the (n-1) equally divided lines are sequentially arranged, wherein the equally divided line close to the first boundary line is a first equally divided line, the equally divided line close to the second boundary line is an (n-1)th equally divided line, the intersection point of the first boundary line and the first outer boundary is a first first intersection point, the intersection point of the first equally divided line and the first outer boundary is a second first intersection point, the intersection point of the (n-1)th equally divided line and the first outer boundary is an n-th first intersection point, the intersection point of the second boundary line and the first outer boundary is an (n+1)th first intersection point, and the second distance corresponding to the first intersection point decreases with the increase of the value of the first intersection point.

[0014] In the flexible display module provided in the embodiments of the present application, in the flattened state of the display panel, the outer boundary of the orthographic projection of the second corner portion on the horizontal plane where the display panel is located is a third outer boundary, the outer boundary of the first corner portion is a fourth outer boundary, the distance from the fourth outer boundary to the first edge portion is a fourth distance, the distance from the fourth outer boundary to the third outer boundary is a fifth distance, the fifth distance increases with the increase of the fourth distance, or the fifth distance decreases with the increase of the fourth distance.

[0015] In the flexible display module provided in the embodiments of the present application, the fifth distance changes with the change of the fourth distance and is negatively correlated with the change of the second distance with the change of the first distance.

[0016] In the flexible display module provided in the embodiments of the present application, in the flattened state of the display panel, the dividing line between the first corner portion and one of the first edge portions is a third dividing line, the dividing line between the first corner portion and another of the first edge portions is a fourth dividing line, the first corner portion is equally divided into n parts, the third dividing line, the fourth dividing line and each of the equally divided lines intersect the fourth outer boundary at a second intersection point and intersect the third outer boundary at a third intersection point, and the distance from each of the second intersection points to the corresponding third intersection point is the fifth distance.

[0017] In the embodiments of the present application, the (n-1) equally divided lines are sequentially arranged, wherein the equally divided line close to the third dividing line is the first equally divided line, the equally divided line close to the fourth dividing line is the (n-1)th equally divided line, the intersection point of the third dividing line and the fourth outer boundary is the first second intersection point, the intersection point of the first equally divided line and the fourth outer boundary is the second second intersection point, the intersection point of the (n-1)th equally divided line and the fourth outer boundary is the n-th second intersection point, the intersection point of the fourth dividing line and the fourth outer boundary is the (n+1)th second intersection point, and the fifth distance corresponding to the second intersection point increases with the increase of the value thereof.

[0018] In the flexible display module provided in the embodiments of the present application, the sinking distance of the second outer boundary relative to the second planar portion is a sixth distance, and the sixth distance increases with the increase of the second distance.

[0019] The embodiments of the present application also provide a method for attaching a cover plate to a flexible display module, which comprises:

[0020] providing a cover plate, the cover plate comprising a second planar portion and a second edge portion and a second corner portion connected to the periphery of the second planar portion, and the second corner portion connecting two adjacent second edge portions;

[0021] The display panel is provided, which comprises a middle area and a side area and a corner area surrounding the middle area, and the corner area connects two adjacent side areas;

[0022] The display panel is aligned with the cover plate, and the display panel and / or the cover plate are moved so that the middle area is first attached to the second planar part to form a first planar part, and the side area on one side of the corner area, the corner area, and the side area on the other side of the corner area are sequentially attached to the second side part on one side of the second corner part, the second corner part, and the second side part on the other side of the second corner part, respectively, to form a first side part, a first corner part, and another first side part, so that the display panel is attached to the cover plate, the distance from the first corner part to the first side part is a first distance, the distance from the first outer boundary of the first corner part to the first planar part is a second distance, the second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance, the first outer boundary is inwardly recessed from the second outer boundary of the second corner part away from the second planar part, the distance from the first outer boundary to the second outer boundary is a third distance, and the third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance.

[0023] The display panel and the cover plate are attached, and the first corner part of the display panel is attached to the first side part, the distance from the first corner part to the first side part is a first distance, the distance from the first outer boundary of the first corner part to the first planar part is a second distance, the second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance, the first outer boundary is inwardly recessed from the second outer boundary of the second corner part of the cover plate, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance, the matching of the display panel and the cover plate is improved, so that when the display panel is attached to the cover plate, the first corner part is prevented from being in contact with the cover plate before the first side part, and wrinkles in the first corner part are avoided, thereby solving the problem of wrinkles in the Gaussian surface of the existing four-curved screen. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a schematic diagram of a four-curved screen formed by bonding a display panel and a cover plate in the related art.

[0026] Figure 2 is a schematic diagram of an overall structure of a flexible display module provided in an embodiment of the present application.

[0027] Figure 3 is a schematic diagram of an overall structure of a flexible display module provided in an embodiment of the present application. Figure 2 is a schematic diagram of a disassembled flexible display module.

[0028] Figure 4 is a schematic diagram of a disassembled flexible display module. Figure 2 is a schematic diagram of a partial cross-sectional structure of a flexible display module.

[0029] Figure 5 is a schematic diagram of a partial cross-sectional structure of a flexible display module. Figure 3 is a schematic diagram of a detail structure of a first corner on a display panel.

[0030] Figure 6 is a schematic diagram of a detail structure of a first corner on a display panel. Figure 3

[0031] is a schematic diagram of a detail structure of a first corner on a display panel. Figure 7 Figure 6 is a schematic diagram of a variation of a second distance corresponding to each point on a first outer boundary.

[0032] Figure 8 is a schematic diagram of a planar structure of a first corner in a flattened state provided in an embodiment of the present application.

[0033] Figure 9 is a schematic diagram of a planar structure of a first corner in a flattened state provided in an embodiment of the present application.

[0034] Figure 10 Figure 9 is a schematic diagram of a variation of a fifth distance corresponding to each point on a fourth outer boundary.

[0035] Figure 11 is a flowchart of a bonding method of a cover plate of a flexible display module provided in an embodiment of the present application.

[0036] Figure 12 is a comparative diagram of a first initial curve and a first target curve provided in an embodiment of the present application.

[0037] Figure 13 is a comparative diagram of a second initial curve and a second target curve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] ​​The following description of the embodiments refers to the accompanying drawings, which are used to exemplify particular embodiments of the present application that can be practiced. Directional terms as used in this application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side], and the like, are made only with reference to the accompanying drawings. The directional terms are used to illustrate and understand the application, but not to limit the application. In the drawings, similar elements are denoted using the same reference numbers. In the drawings, the thicknesses of some layers and regions are exaggerated for clarity and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.

[0039] The four-curved screen, as the name implies, refers to further increasing the curved screens at the upper and lower ends on the basis of the curved screens at the left and right sides of the central flat screen. That is, the four-curved screen has a curved surface in the upper, lower, left, and right directions, and the performance of the four-curved screen in terms of screen ratio and the like is greatly improved compared with the two-curved screen. The four-curved screen is usually formed by bonding a display panel and a cover plate having a curved surface together.

[0040] The inventors have found that, when the four-curved screen is bonded, there is a transverse and longitudinal curved overlap region at the four corners, and the display panel is compressed when it is bonded into the curved overlap region. The curved overlap region is referred to as a Gauss corner region, and the curved surface of the curved overlap region is referred to as a Gauss curved surface. According to the size of the area of the display panel bonded into the Gauss corner region, the four-curved screen can be divided into a pseudo four-curved screen and a true four-curved screen.

[0041] The pseudo four-curved screen refers to a display panel that does not enter the Gauss corner region or enters less when bonded, so the display panel is less stressed, the strain of the entire display panel is also small, the risk of thin film packaging failure is low, and it is easier to manufacture. However, the display area of the display panel does not cover the Gauss corner region, which affects the screen ratio and display effect of the four-curved screen.

[0042] The true four-curved screen refers to a display panel that completely enters the Gauss corner region, so that the Gauss curved surface of the Gauss corner region can be displayed to achieve a four-curved screen with a high screen ratio. However, the larger the area of the display panel entering the Gauss corner region, the greater the compression of the display panel. The greater the compression, the more obvious the wrinkles formed by the compression of the Gauss curved surface of the four-curved screen, and the more likely the internal metal traces and inorganic layers of the display panel to crack and fail when bonded.

[0043] For the true four-curved screen, the display panel and the cover plate are also bonded together by means of a bonding device. Specifically, referring to Figure 1 , Figure 1is a schematic diagram of related technology for bonding a display panel and a cover plate to form a four-curved surface screen, and the bonding process of the four-curved surface screen 600 is roughly as follows: first, the cover plate 601 is fixed on the first fixed table 701 of the bonding device, the display panel 602 is bonded with the guide film (Guide Film, GF) 603, and the guide film 603 is used to support and guide the deformation of the display panel 602; the edge of the guide film 603 is fixed on the clamp 702 of the bonding device, and the silicone top table (PAD) 703 of the bonding device is located on the side of the guide film 603 away from the first fixed table 701, and the silicone top table 703 is fixed on the second fixed table 704 of the bonding device. Then move the second fixed table 704 to make the top table 703 lift the guide film 603 to approach the cover plate 601, so that the guide film 603 deforms, and the deformation of the guide film 603 causes the display panel 602 to deform, thereby bonding the display panel 602 and the cover plate 601.

[0044] In view of the problem that wrinkles are prone to occur at the Gaussian surface during bonding of the existing four-curved surface screen, the inventors found in research that the bonding effect can be adjusted by profiling the silicone top table and adding or reducing pressure and pre-bending the guide film. However, when the design matching of the cover plate and the display panel is poor, the silicone top table pressurization will cause the degree of indentation and wrinkles to increase, and even cause cracking failure, and the silicone top table decompression will cause the in-plane air bubbles to rebound and the appearance to be abnormal, and adjusting the pre-bending angle of the guide film has no obvious improvement on the wrinkle problem.

[0045] Therefore, the inventors of the present application have made continuous exploration and research and proposed a flexible display module and a preparation method thereof.

[0046] Please refer to Figures 2 to 5 , Figure 2 for a schematic diagram of the overall structure of the flexible display module provided by the embodiments of the present application, Figure 3 for Figure 2 a disassembly schematic diagram of the flexible display module in Figure 4 for Figure 2 a partial cross-sectional structure schematic diagram of the flexible display module in Figure 5 for Figure 3 a detailed structure schematic diagram of the first corner on the display panel in Figure 2 , the flexible display module includes a planar area and a curved area located outside the planar area. The curved area BD surrounds the planar area PD, and the curved area BD includes a Gaussian corner area GD located at the top corner of the display module 100, which is the area formed by the overlapping of the two adjacent curved areas BD outside the planar area PD.

[0047] Please refer to Figure 3The display module 100 further comprises a display panel 10 and a cover plate 20 disposed on the light-out side of the display panel 10. The display panel is attached to the cover plate. The display panel 10 comprises a flexible organic light emitting display (OLED) panel or the like, which has the performance of being foldable or bendable. The light-out side of the display panel 10 refers to the side of the display panel 10 for displaying a picture. The cover plate 20 has high light transmittance and high hardness, for example, the cover plate 20 is a glass cover plate. The display panel 10 can be attached to the cover plate 20 through a transparent adhesive layer, which comprises OCA glue or the like. Alternatively, the display module 100 can further comprise a polarizer 50 disposed on the light-out side of the display panel 10, and a support disposed on the side of the display panel 10 away from the cover plate. The polarizer 50 is used to reduce the surface reflectivity of the display panel 10. The polarizer 50 can be attached to the surface of the display panel 10 or directly made on the surface of the display panel 10. When the display module 100 comprises the polarizer 50, the polarizer 50 can be located between the cover plate and the display panel. The support is used to support the display panel 10. The material of the support comprises polyethylene terephthalate (PET) or the like.

[0048] The display panel 10 comprises a first planar part PP1 corresponding to the planar area and a first curved part BP1 corresponding to the curved area. The first curved part BP1 comprises a plurality of first edge parts SP1 and a first corner part JP1 connected between two adjacent first edge parts SP1. The cover plate 20 comprises a second planar part PP2 corresponding to the first planar part PP1 and a second curved part BP2 corresponding to the first curved part BP1. The second curved part BP2 comprises a plurality of second edge parts SP2 and a second corner part JP2 connected between two adjacent second edge parts SP2. The second edge parts SP2 are correspondingly arranged with the first edge parts SP1, and the second corner parts JP2 are correspondingly arranged with the first corner parts JP1. Specifically, the first planar part PP1 is attached to the second planar part PP2, and the first planar part PP1 and the second planar part PP2 are located in the planar area. The first edge parts SP1 are attached to the second edge parts SP2, and the first corner parts JP1 are attached to the second corner parts JP2. The first edge parts SP1, the second edge parts SP2, the first corner parts JP1 and the second corner parts JP2 are located in the curved area, and the first corner parts JP1 and the second corner parts JP2 are located in the Gaussian corner area.

[0049] Referring toFigure 4 and Figure 5 The first distance L1 is the distance from each point on the first outer boundary OB1 of the first corner portion JP1 to a fixed point on the first side portion SP1, wherein the fixed point on the first side portion SP1 can be the intersection point of the first outer boundary OB1 and the first side portion SP1, or any point on the boundary line between the first corner portion JP1 and the first side portion SP1, such as the midpoint of the boundary line, which is not limited in the present application.

[0050] The second distance L2 is the vertical distance from the first outer boundary OB1 to the plane of the first planar portion PP1, and the second distance L2 increases with the increase of the first distance L1, or the second distance L2 decreases with the increase of the first distance L1. The first outer boundary OB1 is arranged inwardly relative to the second outer boundary OB4 of the second planar portion PP2, and the third distance L5 is the distance from the first outer boundary OB1 to the second outer boundary OB4, which increases with the increase of the first distance L1, or decreases with the increase of the first distance L1. The matching of the display panel 10 and the cover plate 20 is improved, so that when the display panel 10 is attached to the cover plate 20, the first corner portion JP1 does not contact the cover plate 20 before the first side portion SP1, and the first corner portion JP1 does not wrinkle, thereby solving the problem that the existing four-curved screen is prone to wrinkle at the Gaussian surface. The first outer boundary OB1 refers to the outer contour of the first corner portion JP1 orthogonally projected on the plane of the first planar portion PP1, and the first inner boundary IB1 of the first corner portion JP1 is opposite to the first outer boundary OB1, and the first inner boundary IB1 is also the boundary line between the first corner portion JP1 and the first planar portion PP1.

[0051] The third distance changes in negative correlation with the second distance as the first distance changes. In the present application, negative correlation means that the change directions of two variables are opposite, one variable increases and the other variable decreases, or one variable decreases and the other variable increases. Accordingly, the third distance changes in negative correlation with the second distance as the first distance changes, that is, the change directions of the third distance and the second distance as the first distance changes are opposite. Specifically, when the third distance increases as the first distance increases, the second distance decreases as the first distance increases; when the third distance decreases as the first distance increases, the second distance increases as the first distance increases.

[0052] Optionally, the third distance L5 decreases as the second distance L2 increases, so that the matching of the display panel 10 and the cover plate 20 can be further improved, and the problem that the first corner portion JP1 is prone to wrinkle when the first corner portion JP1 contacts the cover plate 20 before the first side portion SP1 when the display panel 10 is attached to the cover plate 20 can be better avoided, so that the problem that the existing four-curved-surface screen is prone to wrinkle at the Gaussian surface can be alleviated. Of course, in some other embodiments, the third distance L5 can also increase as the second distance L2 decreases, which will not be described herein.

[0053] The curvature of the middle region of the first outer boundary OB1 is greater than the curvature of the two side regions, and the curvature of the middle region of the second outer boundary OB4 is greater than the curvature of the two side regions, so as to further improve the matching of the display panel 10 and the cover plate 20.

[0054] Specifically, referring to Figure 5 , the distance from the first outer boundary OB1 to the first side portion SP1 refers to the distance from each point on the first outer boundary OB1 to the same fixed point on the first side portion SP1, such as Figure 5As shown, the distances between the points 1P1, 2P1, 3P1, 4P1, 5P1, 6P1, 7P1 on the first outer boundary OB1 and the fixed point P0 on the first side SP1, wherein the first corner JP1 is divided by one of the first side SP1 by a first dividing line FL1, and by the other of the first side SP1 by a second dividing line FL2, and the points 1P1, 2P1, 3P1, 4P1, 5P1, 6P1, 7P1 are the intersection points of the first dividing line FL1, the bisectors DL1, DL2, DL3, DL4, DL5 of the first corner JP1, and the second dividing line FL2 and the first outer boundary OB1, respectively. The fixed point P0 on the first side SP1 can be any point on the first dividing line FL1, such as the midpoint of the first dividing line FL1. As the points on the first outer boundary OB1 approach the second dividing line FL2, the first distance L1 between the points on the first outer boundary OB1 and the fixed point P0 on the first side SP1 increases, and the second distance L2 of each point on the first outer boundary OB1 relative to the first planar portion PP1 also increases, i.e., each point on the first outer boundary OB1 has a second distance L2 to the plane in which the first planar portion PP1 is located. The second distance L2 increases with the increase of the first distance L1, or the second distance L2 decreases with the increase of the first distance L1.

[0055] In one embodiment, referring to Figures 2 to 7 , Figure 6 In one embodiment, referring to Figure 3 Fig. 6 is another detailed structural diagram of the first corner JP1 on the display panel 10 in Fig. 1, Figure 7 In one embodiment, referring to Figure 6 Fig. 7 is a graph showing the change of the second distance L2 corresponding to the points on the first outer boundary OB1 in Fig. 1. Referring to Figure 6 , the first corner JP1 is divided by one of the first side SP1 by a first dividing line FL1, and by the other of the first side SP1 by a second dividing line FL2. The first corner JP1n is divided, n is an integer greater than or equal to 2, and accordingly, (n-1) bisectors are needed. The first corner JP1n is divided means that the first surface formed by the first outer boundary OB1, the first dividing line FL1, the first inner boundary IB1, and the second dividing line FL2 is divided into n parts, i.e., the surface of the first corner JP1 close to the upper surface of the cover plate 20, i.e., the surface of the first corner JP1 adhered to the cover plate 20, is divided into n parts, and the first surface is located in the Gaussian angle region. The first surface can be divided into n parts by dividing the Gaussian angle formed by the first corner JP1 into n parts, such as 15 degrees or other angles.

[0056] The first dividing line FL1, the second dividing line FL2, and each dividing line intersect the first outer boundary OB1 at a first intersection point. The downward distance of each first intersection point relative to the first planar part PP1 is the second distance L2, that is, the vertical distance from each first intersection point to the plane where the first planar part PP1 is located is the second distance L2. For example, let (n-1) bisectors be arranged sequentially. The bisector closest to the first boundary line FL1 is the first bisector, the bisector closest to the second boundary line FL2 is the (n-1)th bisector, the intersection of the first boundary line FL1 and the first outer boundary OB1 is the first intersection point, the intersection of the first bisector and the first outer boundary OB1 is the second intersection point, the intersection of the (n-1)th bisector and the first outer boundary OB1 is the nth intersection point, and the intersection of the second boundary line FL2 and the first outer boundary OB1 is the (n+1)th intersection point. The second distance L2 corresponding to the first intersection point decreases as its value increases. The value of the first intersection point refers to its order on the first outer boundary OB1; for example, the value of the first intersection point is 1, the value of the second intersection point is 2, and the value of the nth intersection point is n.

[0057] Optionally, this application's embodiments are illustrated using n=6 as an example, referring to... Figure 6 Divide the first corner JP16 into equal parts. Correspondingly, five dividing lines DL1, DL2, DL3, DL4, and DL5 are needed. These five dividing lines are arranged sequentially from the first dividing line FL1 to the second dividing line FL2. The first dividing line FL1 intersects the first outer boundary OB1 at the first intersection point 1P1. The first dividing line DL1 intersects the first outer boundary OB1 at the second intersection point 2P1. The second dividing line DL2 intersects the first outer boundary OB1 at the third intersection point 3P1. The third dividing line DL3 intersects the first outer boundary OB1 at the fourth intersection point 4P1. The fourth dividing line DL4 intersects the first outer boundary OB1 at the fifth intersection point 5P1. The fifth dividing line DL5 intersects the first outer boundary OB1 at the sixth intersection point 6P1. The second dividing line FL2 intersects the first outer boundary OB1 at the seventh intersection point 7P1. Each first intersection point has a second distance L2 to the plane containing the first planar portion PP1. The second distance L2 decreases as the value of the first intersection point increases. Figure 7Of course, if the intersection point of the second boundary line FL2 and the first outer boundary OB1 is defined as the first first intersection point, then the order of the other intersection points on the first outer boundary OB1 also changes accordingly, such as the intersection point of the fifth bisector and the first outer boundary OB1 is the second first intersection point, and so on. At this time, the second distance L2 increases with the increase of the value of the first intersection point.

[0058] It can be understood that according to the bisecting method of the first corner JP1, the second corner JP2 is also bisected by n, and the number of bisected points on the second outer boundary OB4 of the second corner JP2 is the same as that of the first corner JP1, such as the second corner JP2 and the first corner JP1 are both bisected by 6, and the number of bisected points on the second outer boundary OB4 of the second corner JP2 is the same as that of the first corner JP1, and one-to-one correspondence, the distance between the bisected points on the first outer boundary OB1 of the first corner JP1 and the corresponding bisected points on the second outer boundary OB4 is the third distance L5, which will not be described here.

[0059] In one embodiment, referring to Figures 2 to 8 , Figure 8 A schematic diagram of a planar structure of the first corner JP1 in a flattened state provided by an embodiment of the present application. Referring to Figure 8, the outer boundary of the second corner portion JP2 in the flattened state is a third outer boundary OB2, and the outer boundary of the first corner portion JP1 is a fourth outer boundary OB3. The third outer boundary OB2 of the second corner portion JP2 exceeds the fourth outer boundary OB3 of the first corner portion JP1, the distance from the fourth outer boundary OB3 to the first side portion SP1 is a fourth distance L3, the distance from the fourth outer boundary OB3 to the third outer boundary OB2 is a fifth distance L4, and the fifth distance L4 increases or decreases with the increase of the fourth distance L3, which can further improve the matching of the display panel 10 and the cover plate 20, avoid the first corner portion JP1 from being in contact with the cover plate 20 before the first side portion SP1 when the display panel 10 is attached to the cover plate 20, and thus prevent the first corner portion JP1 from being wrinkled, thereby solving the problem that the existing four-curved-surface screen is prone to wrinkles at the Gaussian curved surface when being attached. Wherein, the third outer boundary OB2 refers to the outer contour of the second corner portion JP2 in the orthogonal projection on the plane where the second planar portion PP2 is located, and the second inner boundary IB2 of the second corner portion JP2 opposite to the third outer boundary OB2 is the boundary line between the second corner portion JP2 and the second planar portion PP2. In other words, the third outer boundary OB2 is the orthogonal projection of the second outer boundary OB4 on the plane where the second planar portion PP2 is located, or the orthogonal projection of the second outer boundary OB4 on the horizontal plane where the display panel 10 is located. The fourth outer boundary OB3 refers to the outer contour of the first corner portion JP1 in the flattened state, and the third inner boundary IB3 of the first corner portion JP1 opposite to the fourth outer boundary OB3 is the boundary line between the first corner portion JP1 and the first planar portion PP1. When the display panel 10 is in the flattened state, the first planar portion PP1, the first side portion SP1 and the first corner portion JP1 are located on the same horizontal plane.

[0060] Specifically, referring to Figure 8 , the distance from the fourth outer boundary OB3 to the first side portion SP1 refers to the distance from each point on the fourth outer boundary OB3 to the same fixed point on the first side portion SP1, such as Figure 8As shown in the figure, the fourth distance L3 between each point on the fourth outer boundary OB3 and the fixed point on the first side SP1 increases as the point on the fourth outer boundary OB3 approaches the fourth boundary line FL4, while the fifth distance L4 between each point on the fourth outer boundary OB3 and the corresponding point on the third outer boundary OB2 remains unchanged. The fifth distance L4 increases as the fourth distance L3 increases, or the fifth distance L4 decreases as the fourth distance L3 increases.

[0061] The fourth distance L3 between each point on the fourth outer boundary OB3 and the fixed point on the first side SP1 increases as the point on the fourth outer boundary OB3 approaches the fourth boundary line FL4, while the fifth distance L4 between each point on the fourth outer boundary OB3 and the corresponding point on the third outer boundary OB2 remains unchanged. The fifth distance L3 increases as the fourth distance L3 increases, or the fifth distance L3 decreases as the fourth distance L3 increases. Figure 8 As shown in the figure, the fourth distance L3 between each point on the fourth outer boundary OB3 and the fixed point on the first side SP1 increases as the point on the fourth outer boundary OB3 approaches the fourth boundary line FL4, while the fifth distance L4 between each point on the fourth outer boundary OB3 and the corresponding point on the third outer boundary OB2 remains unchanged. The fifth distance L3 increases as the fourth distance L3 increases, or the fifth distance L3 decreases as the fourth distance L3 increases.

[0062] As shown in the figure, the fourth distance L3 between each point on the fourth outer boundary OB3 and the fixed point on the first side SP1 increases as the point on the fourth outer boundary OB3 approaches the fourth boundary line FL4, while the fifth distance L4 between each point on the fourth outer boundary OB3 and the corresponding point on the third outer boundary OB2 remains unchanged. The fifth distance L3 increases as the fourth distance L3 increases, or the fifth distance L3 decreases as the fourth distance L3 increases.

[0063] Optionally, the fifth distance L4 changes in negative correlation with the change of the fourth distance L3, that is, when the fifth distance L4 increases with the increase of the fourth distance L3, the second distance L2 decreases with the increase of the first distance L1; when the fifth distance L4 decreases with the increase of the fourth distance L3, the second distance L2 increases with the increase of the first distance L1. In this way, the matching of the display panel 10 and the cover plate 20 can be further improved, and the problem that the first corner portion JP1 is prone to wrinkles when the display panel 10 is attached to the cover plate 20 can be alleviated.

[0064] In an embodiment, referring to Figures 2 to 10 , Figure 9 FIG. 6 is another planar structure diagram of the first corner portion JP1 in the flattened state according to an embodiment of the present application, Figure 10 for Figure 9 FIG. 7 is a change curve diagram of the fifth distance L4 corresponding to each point on the fourth outer boundary OB3 in the display panel 10 according to an embodiment of the present application. Referring to Figure 9 , in the flattened state, the display panel 10, the first corner portion JP1 and one of the first side portions SP1 are connected by a third boundary line FL3, and the first corner portion JP1 and the other first side portion SP1 are connected by a fourth boundary line FL4, the second corner portion JP2 and one of the second side portions SP2 are connected by a fifth boundary line, and the second corner portion JP2 and the other second side portion SP2 are connected by a sixth boundary line, wherein the second boundary line FL2 and the third boundary line FL3 are connected, and the sixth boundary line and the fourth boundary line FL4 are connected. The first corner portion JP1 is equally divided into n parts, n is an integer greater than or equal to 2, and (n-1) equally divided lines are needed accordingly. The third boundary line FL3, the fourth boundary line FL4 and each equally divided line intersect the fourth outer boundary OB3 at a second intersection point and intersect the third outer boundary OB2 at a third intersection point. The distance from each second intersection point to the corresponding third intersection point is the fifth distance L4.

[0065] For example, the (n-1) bisectors are arranged in sequence, wherein the bisector close to the third boundary line FL3 is the first bisector, the bisector close to the fourth boundary line FL4 is the (n-1)th bisector, the intersection of the third boundary line FL3 and the fourth outer boundary OB3 is the first second intersection point, the intersection of the first bisector and the fourth outer boundary OB3 is the second second intersection point, the intersection of the (n-1)th bisector and the fourth outer boundary OB3 is the nth second intersection point, the intersection of the fourth boundary line FL4 and the fourth outer boundary OB3 is the (n+1)th second intersection point, and the fifth distance L4 corresponding to the second intersection point increases as the value of the second intersection point increases. The value of the second intersection point refers to the sequence of the second intersection point on the fourth outer boundary OB3, for example, the value of the first second intersection point is 1, the value of the second second intersection point is 2, and the value of the nth second intersection point is n.

[0066] Correspondingly, the intersection of the fifth boundary line and the third outer boundary OB2 is the first third intersection point, the intersection of the first bisector and the third outer boundary OB2 is the second third intersection point, the intersection of the (n-1)th bisector and the third outer boundary OB2 is the nth third intersection point, and the intersection of the sixth boundary line and the third outer boundary OB2 is the (n+1)th third intersection point. The first third intersection point corresponds to the first second intersection point, the nth third intersection point corresponds to the nth second intersection point, and the distance between the nth second intersection point and the nth third intersection point is the fifth distance L4.

[0067] Optionally, the present application takes n=6 as an example for illustration, with reference to Figure 9 The first corner JP16 is bisected, and correspondingly, 5 bisectors DL1, DL2, DL3, DL4, and DL5 are needed, which are arranged in sequence from the third boundary line FL3 to the fourth boundary line FL4. The third boundary line FL3 intersects the fourth outer boundary OB3 at the first second intersection point 1P2, the first bisector DL1 intersects the fourth outer boundary OB3 at the second second intersection point 2P2, the second bisector DL2 intersects the fourth outer boundary OB3 at the third second intersection point 3P2, the third bisector DL3 intersects the fourth outer boundary OB3 at the fourth second intersection point 4P2, the fourth bisector DL4 intersects the fourth outer boundary OB3 at the fifth second intersection point 5P2, the fifth bisector DL5 intersects the fourth outer boundary OB3 at the sixth second intersection point 6P2, and the fourth boundary line FL4 intersects the fourth outer boundary OB3 at the seventh second intersection point 7P2.

[0068] Correspondingly, the fifth boundary line intersects the third outer boundary OB2 at a first third intersection point 1P3, the first bisector DL1 intersects the third outer boundary OB2 at a second third intersection point 2P3, the second bisector DL2 intersects the third outer boundary OB2 at a third third intersection point 3P3, the third bisector DL3 intersects the third outer boundary OB2 at a fourth third intersection point 4P3, the fourth bisector DL4 intersects the third outer boundary OB2 at a fifth third intersection point 5P3, the fifth bisector DL5 intersects the third outer boundary OB2 at a sixth third intersection point 6P3, and the sixth boundary line intersects the third outer boundary OB2 at a seventh third intersection point 7P3.

[0069] Each second intersection point has a fifth distance L4 to the corresponding third intersection point, and the fifth distance L4 increases as the value of the second intersection point increases, as shown. Figure 10 Of course, if the intersection point of the fourth boundary line FL4 and the fourth outer boundary OB3 is defined as the first second intersection point, then the order of the other intersection points on the fourth outer boundary OB3 also changes accordingly, for example, the intersection point of the fifth bisector and the fourth outer boundary OB3 is the second second intersection point, and so on. At this time, the fifth distance L4 decreases as the value of the second intersection point increases.

[0070] In an embodiment, the second outer boundary OB4 has a sixth distance relative to the sinking distance of the second planar portion PP2, and the sixth distance increases as the second distance L2 increases, so as to further improve the matching of the display panel 10 and the cover plate 20.

[0071] Based on the same inventive concept, the embodiments of the present application also provide a cover plate attaching method of a flexible display module. Figures 2 to 13 , Figure 11 A flowchart of the cover plate attaching method of the flexible display module provided by the embodiments of the present application is shown in Figure 12 A comparison diagram of the first initial curve ML1 and the first target curve TL1 provided by the embodiments of the present application is shown in Figure 13 A comparison diagram of the second initial curve ML2 and the second target curve TL2 provided by the embodiments of the present application is shown in. Referring to Figure 11 , the cover plate attaching method of the flexible display module comprises the following steps:

[0072] S201: providing a cover plate, the cover plate comprising a second planar portion, a second edge portion and a second corner portion connected to the periphery of the second planar portion, and the second corner portion connecting two adjacent second edge portions;

[0073] S202: providing a display panel, the display panel comprising a middle area and a side area and a corner area surrounding the middle area, the corner area connecting two adjacent side areas;

[0074] S203: aligning the display panel with the cover plate, and moving the display panel and / or the cover plate, so that the middle area is firstly attached to the second planar part to form a first planar part, and the side area on one side of the corner area, the corner area, and the side area on the other side of the corner area are sequentially attached to the second side part on one side of the second corner part, the second corner part, and the second side part on the other side of the second corner part respectively to form a first side part, a first corner part, and another first side part, so that the display panel is attached to the cover plate, the distance from the first corner part to the first side part is a first distance, the vertical distance from the first outer boundary of the first planar part to the sink is a second distance, the second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance, the first outer boundary is recessed in the second outer boundary of the second corner part away from the second planar part, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance.

[0075] Before providing the cover plate and the display panel, the method further comprises the following steps:

[0076] forming a target cover plate model and a target display panel model;

[0077] preparing the cover plate 20 according to the target cover plate model;

[0078] preparing the display panel 10 according to the target display panel model.

[0079] Specifically, the step of forming the target cover plate model and the target display panel model comprises:

[0080] providing a simulation cover plate model and a simulation display panel model, the simulation cover plate model comprising a first simulation planar part and a first simulation curved part located outside the first simulation planar part, the first simulation curved part comprising a first simulation side part and a first simulation corner part connected between two adjacent first simulation side parts;

[0081] fitted with the first simulation flat part, the first simulation corner part and the first simulation edge part, and the simulation display panel model is fitted with the first simulation flat part to form a second simulation flat part, fitted with the first simulation corner part to form a second simulation corner part, and fitted with the first simulation edge part to form a second simulation edge part;

[0082] a first initial curve ML1 is drawn according to the vertical distance from each point on the outer boundary of the second simulation corner part to the plane where the second simulation flat part is located;

[0083] a first target curve TL1 is generated according to the first initial curve ML1, and the first target curve TL1 has an upward or downward trend, as shown in Figure 12 ;

[0084] the size of the simulation cover plate model and / or the simulation display panel model is adjusted according to the first target curve TL1 to form the target cover plate model and the target display panel model.

[0085] Optionally, the step of fitting the simulation display panel model with the simulation cover plate model further comprises:

[0086] a second initial curve ML2 is drawn according to the distance from the outer boundary of the second simulation corner part to the outer boundary of the first simulation corner part;

[0087] a second target curve TL2 is generated according to the second initial curve ML2, and the second target curve TL2 has an upward or downward trend, and the upward or downward trend of the second target curve TL2 is opposite to that of the first target curve TL1, as shown in Figure 13 ;

[0088] the size of the simulation cover plate model and / or the simulation display panel model is adjusted according to the second target curve TL2 to form the target cover plate model and the target display panel model.

[0089] In this way, at the initial design stage, the folding risk can be evaluated by simulating the displacement of the display panel, the initial curve and the target curve can be drawn, the size of the display panel and / or the cover plate can be adjusted to meet the trend of the target curve, the matching of the display panel 10 and the cover plate 20 can be improved, and the relative position of the display panel 10 and the cover plate 20 can be uniformly changed when they are fitted, so as to improve the fitting folding problem, which can also reduce the mold opening cost and the production verification opportunity of the display panel 10 and the cover plate 20, and on the basis of reducing the cost, the product can avoid risks at the initial design stage.

[0090] According to the above embodiments, it can be known that:

[0091] The flexible display module and the cover plate bonding method of the flexible display module provided in the application, the distance from each point on the first outer boundary of the first corner portion of the display panel away from the first plane portion to a fixed point on the first edge portion is a first distance, the vertical distance from the first outer boundary to the plane where the first plane portion is located is a second distance, the second distance increases with the increase of the first distance, or the second distance decreases with the increase of the first distance, the first outer boundary is arranged inwards relative to the second outer boundary of the second corner portion of the cover plate, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases with the increase of the first distance, or the third distance decreases with the increase of the first distance, the matching of the display panel and the cover plate is improved, so that when the display panel is bonded with the cover plate, the first corner portion is prevented from being in contact with the cover plate before the first edge portion, and wrinkles in the first corner portion are avoided, thereby the problem that wrinkles are prone to occur at the Gauss curved surface when the existing four-curved surface screen is bonded can be alleviated.

[0092] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0093] The above describes the embodiments of the application in detail, and the principle and implementation mode of the application are described by applying specific examples; the above embodiment description is only used to help understand the technical solutions and core ideas of the application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and 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 application.

Claims

1. A flexible display module, characterized in that, The flexible display module includes a planar area and a curved area located outside the planar area; the flexible display module also includes: The display panel includes a first planar portion corresponding to the planar area and a first curved portion corresponding to the curved surface area. The first curved portion includes a plurality of first edges and a first corner portion connecting two adjacent first edges. A cover plate is disposed on the light-emitting side of the display panel, the display panel is attached to the cover plate, and the cover plate includes a second flat portion corresponding to the first flat portion and a second corner portion corresponding to the first corner portion; Wherein, the distance from each point on the first outer boundary of the first corner away from the first planar portion to a fixed point on the first side portion is the first distance; the downward distance of the first outer boundary relative to the first planar portion is the second distance; the second distance increases as the first distance increases, or the second distance decreases as the first distance increases; the first outer boundary is recessed relative to the second outer boundary of the second corner away from the second planar portion; the distance from the first outer boundary to the second outer boundary is the third distance; the third distance increases as the first distance increases, or the third distance decreases as the first distance increases. Wherein, the first outer boundary refers to the outer contour of the first corner portion projected onto the plane where the first planar portion is located; the third distance is negatively correlated with the change of the first distance and the second distance is negatively correlated with the change of the first distance. When the third distance increases with the increase of the first distance, the second distance decreases with the increase of the first distance; when the third distance decreases with the increase of the first distance, the second distance increases with the increase of the first distance.

2. The flexible display module according to claim 1, characterized in that, The curvature of the middle region of the first outer boundary is greater than the curvature of the two side regions.

3. The flexible display module according to claim 2, characterized in that, The curvature of the middle region of the second outer boundary is greater than the curvature of the two side regions.

4. The flexible display module according to claim 2, characterized in that, The first corner is divided into two equal parts by a first dividing line and a first side. The first dividing line is divided into two equal parts by a first dividing line and a second dividing line is divided into two equal parts by a second dividing line. The first dividing line, the second dividing line and each dividing line intersect the first outer boundary at a first intersection point. The downward distance of each first intersection point relative to the first planar part is the second distance. Defined as (n-1) equal dividing lines arranged sequentially, wherein the equal dividing line closer to the first dividing line is the first equal dividing line, the equal dividing line closer to the second dividing line is the (n-1)th equal dividing line, the intersection of the first dividing line and the first outer boundary is the first first intersection point, the intersection of the first equal dividing line and the first outer boundary is the second first intersection point, the intersection of the (n-1)th equal dividing line and the first outer boundary is the nth first intersection point, the intersection of the second dividing line and the first outer boundary is the (n+1)th first intersection point, and the second distance corresponding to the first intersection point decreases as the value of the first intersection point increases; The value of the first intersection point refers to the order of the first intersection point on the first outer boundary.

5. The flexible display module according to claim 4, characterized in that, When the display panel is in a flattened state, the outer boundary of the orthographic projection of the second corner onto the horizontal plane of the display panel is the third outer boundary, the outer boundary of the first corner is the fourth outer boundary, the distance from the fourth outer boundary to the first edge is the fourth distance, and the distance from the fourth outer boundary to the third outer boundary is the fifth distance. The fifth distance increases as the fourth distance increases, or the fifth distance decreases as the fourth distance increases.

6. The flexible display module according to claim 5, characterized in that, The fifth distance is negatively correlated with the change of the fourth distance and the second distance is negatively correlated with the change of the first distance. When the fifth distance increases with the increase of the fourth distance, the second distance decreases with the increase of the first distance; when the fifth distance decreases with the increase of the fourth distance, the second distance increases with the increase of the first distance.

7. The flexible display module according to claim 6, characterized in that, In the flattened state, the dividing line between the first corner and one of the first edges is the third dividing line, and the dividing line between the first corner and another of the first edges is the fourth dividing line. The first corner is divided into n equal parts. The third dividing line, the fourth dividing line, and each dividing line intersect the fourth outer boundary at a second intersection point, and intersect the third outer boundary at a third intersection point. The distance from each second intersection point to the corresponding three intersection points is the fifth distance. Defined as (n-1) equal dividing lines arranged sequentially, wherein the equal dividing line closer to the third dividing line is the first equal dividing line, the equal dividing line closer to the fourth dividing line is the (n-1)th equal dividing line, the intersection of the third dividing line and the fourth outer boundary is the first second intersection point, the intersection of the first equal dividing line and the fourth outer boundary is the second second intersection point, the intersection of the (n-1)th equal dividing line and the fourth outer boundary is the nth second intersection point, and the intersection of the fourth dividing line and the fourth outer boundary is the (n+1)th second intersection point. The fifth distance corresponding to the second intersection point increases as the value of the second intersection point increases. The value of the second intersection point refers to the order of the second intersection point on the fourth outer boundary.

8. The flexible display module according to any one of claims 1 to 7, characterized in that, The downward distance of the second outer boundary relative to the second planar portion is the sixth distance, which increases as the second distance increases.

9. A method for bonding a cover plate to a flexible display module, characterized in that, include: A cover plate is provided, the cover plate including a second planar portion and a second side portion and a second corner portion connected to the periphery of the second planar portion, the second corner portion connecting two adjacent second side portions; A display panel is provided, the display panel including a central region and side regions and corner regions surrounding the central region, the corner regions connecting two adjacent side regions; Align the display panel with the cover plate, and move the display panel and / or the cover plate so that the middle area first fits with the second flat portion to form a first flat portion. Then, the side area on one side of the corner area, the corner area, and the side area on the other side of the corner area sequentially fit with the second side on one side of the second corner area, the second corner area, and the second side on the other side of the second corner area, respectively forming a first side area, a first corner area, and another first side area, so that the display panel fits with the cover plate. The distance from the first outer boundary of the first corner area away from the first flat portion to the first side area is the first distance. The vertical distance of the first outer boundary relative to the first flat portion is the second distance. The second distance increases as the first distance increases, or the second distance decreases as the first distance increases. The first outer boundary is recessed within the second outer boundary of the second corner area away from the second flat portion. The distance from the first outer boundary to the second outer boundary is the third distance. The third distance increases as the first distance increases, or the third distance decreases as the first distance increases. Wherein, the first outer boundary refers to the outer contour of the first corner portion projected onto the plane where the first planar portion is located; the third distance is negatively correlated with the change of the first distance and the second distance is negatively correlated with the change of the first distance. When the third distance increases with the increase of the first distance, the second distance decreases with the increase of the first distance; when the third distance decreases with the increase of the first distance, the second distance increases with the increase of the first distance.

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