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

Abstract

The invention provides a flexible display module and a cover plate fitting method of the flexible display module, the distance from each point on a first outer boundary, far away from a first plane part, of a first corner part of a display panel to a fixed point on a first edge part is a first distance, and the sinking distance of the first outer boundary relative to the first plane part is a second distance; the second distance is increased along with the increase of the first distance, or the second distance is decreased along with the increase of the first distance, the first outer boundary is arranged in an inward shrinkage mode relative to a second outer boundary of a second corner of the cover plate, the distance between the first outer boundary and the second outer boundary is a third distance, and the third distance is increased along with the increase of the first distance; or the third distance is reduced along with the increase of the first distance, the matching performance of the display panel and the cover plate is improved, so that when the display panel is attached to the cover plate, the situation that the first corner part is wrinkled due to the fact that the first corner part makes contact with the cover plate before the first edge part is avoided, and the problem that wrinkles are likely to occur at the Gaussian curved surface when an existing four-curved-surface screen is attached can be solved.

Description

Technical Field

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

[0002] With the development of display technology, curved screens have become a hot topic in the current display field. The curvature of the curved side of the curved screen can increase the display area, improve the screen-to-body ratio, and bring a better sensory experience to users. Curved screens include dual-curved screens formed by two opposite sides of the display screen having a certain curvature, and quad-curved screens formed by four sides of the display screen having a certain curvature. Compared with dual-curved screens, quad-curved screens have greatly improved performance in terms of screen-to-body ratio. Quad-curved screens are usually formed by bonding a display panel and a curved cover plate together. For a quad-curved screen, a Gaussian surface is formed at the intersection of two adjacent curved edges, and the Gaussian surface is prone to wrinkles when bonded. Summary of the invention

[0003] The present application provides a flexible display module and a cover plate bonding method for the flexible display module, so as to alleviate the technical problem that wrinkles are easily formed at the Gaussian curved surface when the existing four-curved screen is bonded.

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

[0005] An embodiment of 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 also includes:

[0006] A display panel, the display panel comprising a first planar portion arranged corresponding to the planar area and a first curved portion arranged corresponding to the curved area, the first curved portion comprising a plurality of first side portions and a first corner portion connected between two adjacent first side portions;

[0007] a cover plate, arranged on a light-emitting side of the display panel, the display panel being attached to the cover plate, the cover plate comprising a second plane portion corresponding to the first plane portion, and a second corner portion corresponding to the first corner portion;

[0008] Among them, the distance from each point on the first outer boundary of the first corner away from the first plane portion to a fixed point on the first side portion is a first distance, the sinking distance of the first outer boundary relative to the first plane portion 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 retracted relative to the second outer boundary of the second corner away from the second plane portion, 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.

[0009] In the flexible display module provided in the embodiment of the present application, a change in the third distance with the first distance is negatively correlated with a change in the second distance with the first distance.

[0010] In the flexible display module provided in the embodiment of the present application, the curvature of the middle area of ​​the first outer boundary is greater than the curvature of the areas on both sides.

[0011] In the flexible display module provided in the embodiment of the present application, the curvature of the middle area of ​​the second outer boundary is greater than the curvature of the areas on both sides.

[0012] In the flexible display module provided in the embodiment of the present application, the boundary line between the first corner and one of the first sides is a first boundary line, and the boundary line between the first corner and another first side is a second boundary line, the first corner is divided into n equal parts, the first boundary line, the second boundary line, and each of the equal dividing lines intersect with the first outer boundary at a first intersection point, and the sinking distance of each of the first intersection points relative to the first plane portion is the second distance;

[0013] Definition: (n-1) bisectors are arranged in sequence, wherein the bisector close to the first dividing line is the first bisector, and the bisector close to the second dividing line is the (n-1)th bisector, the intersection of the first dividing line and the first outer boundary is the first first intersection, the intersection of the first bisector and the first outer boundary is the second first intersection, the intersection of the (n-1)th bisector and the first outer boundary is the nth first intersection, and the intersection of the second dividing line and the first outer boundary is the (n+1)th first intersection, and the second distance corresponding to the first intersection decreases as its value increases.

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

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

[0016] In the flexible display module provided in the embodiment of the present application, when the display panel is flattened, the boundary line between the first corner and one of the first sides is the third boundary line, and the boundary line between the first corner and another first side is the fourth boundary line, the first corner is divided into n equal parts, the third boundary line, the fourth boundary line, and each of the equal dividing lines intersect with the fourth outer boundary at the second intersection point, and intersect with the third outer boundary at the third intersection point, respectively, and the distance from each of the second intersection points to the corresponding three intersection points is the fifth distance;

[0017] Definition: (n-1) bisectors are arranged in sequence, wherein the bisector close to the third dividing line is the first bisector, and the bisector close to the fourth dividing line is the (n-1)th bisector, the intersection of the third dividing line and the fourth outer boundary is the first second intersection, the intersection of the first bisector and the fourth outer boundary is the second second intersection, the intersection of the (n-1)th bisector and the fourth outer boundary is the nth second intersection, and the intersection of the fourth dividing line and the fourth outer boundary is the (n+1)th second intersection, and the fifth distance corresponding to the second intersection increases as its value increases.

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

[0019] The embodiment of the present application also provides a cover plate bonding method for a flexible display module, which includes:

[0020] Providing a cover plate, the cover plate comprising a second plane portion, and a second side portion and a second corner portion connected to a peripheral side of the second plane portion, wherein the second corner portion connects two adjacent second side portions;

[0021] Providing a display panel, the display panel comprising a middle area and a side area and a corner area surrounding the middle area, wherein 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 bonded to the second plane portion to form a first plane portion, 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 bonded to the second side on one side of the second corner portion, the second corner portion, and the second side on the other side of the second corner portion to form a first side portion, a first corner portion, and another first side portion, respectively, so that the display panel is bonded to the cover plate, the distance from the first outer boundary of the first corner away from the first plane portion to the first side portion is a first distance, the vertical distance of the first outer boundary relative to the first plane portion is a 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 retracted to the second outer boundary of the second corner away from the second plane portion, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases as the first distance increases, or the third distance decreases as the first distance increases.

[0023] The beneficial effects of the present application are as follows: in the flexible display module and the cover plate bonding method of the flexible display module provided by the present application, the distance from each point on the first outer boundary of the first corner of the display panel away from the first plane portion to a fixed point on the first edge portion is a first distance, the sinking distance of the first outer boundary relative to the first plane portion 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 retracted relative to the second outer boundary of the second corner 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 and the cover plate are bonded, the first corner is avoided from contacting the cover plate before the first edge, resulting in wrinkles at the first corner, thereby alleviating the problem of wrinkles easily appearing at the Gaussian surface when the existing four-curved screen is bonded. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

[0027] Figure 3 for Figure 2 Schematic diagram of the disassembly of the flexible display module.

[0028] Figure 4 for Figure 2 Schematic diagram of the partial cross-sectional structure of the flexible display module.

[0029] Figure 5 for Figure 3 A schematic diagram of a detailed structure of the first corner of the display panel.

[0030] Figure 6 for Figure 3 Another detailed structural diagram of the first corner of the display panel is shown in FIG.

[0031] Figure 7 for Figure 6 A curve diagram of the change of the second distance corresponding to each point on the first outer boundary.

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

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

[0034] Fig.10 for Fig. 9 A curve diagram of the change of the fifth distance corresponding to each point on the fourth outer boundary.

[0035] Fig.11 A schematic flow chart of a cover plate bonding method for a flexible display module provided in an embodiment of the present application.

[0036] Fig.12 A schematic diagram for comparing the first initial curve and the first target curve provided in an embodiment of the present application.

[0037] Fig.13 A schematic diagram for comparing the second initial curve and the second target curve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented in. The directional terms mentioned in the present application, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In the figures, units with similar structures are represented by the same reference numerals. In the accompanying drawings, the thickness of some layers and regions is exaggerated for clear understanding 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 to this.

[0039] As the name implies, the quad-curved screen means that on the basis of the curved left and right sides of the flat screen in the middle, curved screens are further added at the upper and lower ends. That is, the quad-curved screen has curved surfaces in the four directions of top, bottom, left and right. Compared with the double-curved screen, the quad-curved screen has a much better performance in terms of screen-to-body ratio. The quad-curved screen is usually formed by bonding a display panel and a curved cover plate together.

[0040] The inventors discovered that when the four-curved screen is bonded, there are horizontal and vertical bending overlap areas at the four top corners. When the display panel is bonded into the bending overlap area, it will be compressed. The bending overlap area is called a Gaussian angle area, and the curved surface of the bending overlap area is called a Gaussian surface. According to the area of ​​the display panel bonded into the Gaussian angle area, the four-curved screen can be divided into false four-curved and true four-curved.

[0041] Among them, the false four-curve means that the display panel does not enter the Gaussian angle area or enters less when it is bonded, so the display panel is subjected to less force, the strain of the entire display panel is also smaller, the risk of thin-film encapsulation failure is low, and it is easier to manufacture. However, the disadvantage is that the display area of ​​the display panel cannot cover the Gaussian angle area, affecting the screen-to-body ratio and display effect of the four-curved screen.

[0042] True quad-curve means that the display panel completely enters the Gaussian angle area, so that the Gaussian curve in the Gaussian angle area can be displayed, so as to achieve a quad-curved screen with a high screen-to-body ratio. However, as the area of ​​the display panel entering the Gaussian angle area increases, the display panel is compressed more, and the greater the compression, the more obvious the wrinkles formed by the Gaussian curve of the quad-curved screen, and the metal wiring and inorganic layer inside the display panel are more likely to break (crack) and other failures during bonding.

[0043] The four-curved screen with true four-curve is also formed by attaching the display panel and the cover plate together with the aid of an attaching device. Figure 1 , Figure 1It is a schematic diagram of bonding a display panel and a cover plate to form a four-curved screen in the related art. The bonding process of the four-curved screen 600 is roughly as follows: first, the cover plate 601 is fixed on the first fixing platform 701 of the bonding device, and the display panel 602 is bonded with the guide film (GF) 603. 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. The silicone top platform (PAD) 703 of the bonding device is located on the side of the guide film 603 away from the first fixing platform 701. The silicone top platform 703 is fixed on the second fixing platform 704 of the bonding device. Then, the second fixing platform 704 is moved so that the top platform 703 lifts the guide film 603 and moves it closer to the cover plate 601, so that the guide film 603 is deformed, and the deformation of the guide film 603 causes the display panel 602 to deform accordingly, thereby bonding the display panel 602 to the cover plate 601.

[0044] In response to the problem that wrinkles are easily formed on the Gaussian surface when the existing four-curved screen is bonded, the inventors found in their research that the bonding effect can be adjusted by increasing or decreasing the pressure on the contoured silicone top platform and pre-bending the guide film. However, when the design matching between the cover plate and the display panel is not good, increasing the pressure on the silicone top platform will cause marks, aggravated wrinkles, and even fracture and failure. Decompressing the silicone top platform will cause rebound of bubbles in the surface and abnormal appearance. Adjusting the pre-bending angle of the guide film has no obvious improvement on the wrinkle problem.

[0045] To this end, the inventors of the present application have proposed a flexible display module and a method for preparing the same after continuous exploration and research.

[0046] Please refer to Figures 2 to 5 , Figure 2 A schematic diagram of the overall structure of a flexible display module provided in an embodiment of the present application is shown in FIG. Figure 3 for Figure 2 Schematic diagram of the disassembly of the flexible display module. Figure 4 for Figure 2 Schematic diagram of the partial cross-section structure of the flexible display module. Figure 5 for Figure 3 A detailed structural diagram of the first corner of the display panel. Figure 2 The flexible display module includes a plane area and a curved area outside the plane area. The curved area BD surrounds the plane area PD, and the curved area BD includes a Gaussian angle area GD located at the top corner of the display module 100, which is the area formed by the overlap of two adjacent curved areas BD located outside the plane area PD.

[0047] Reference Figure 3, the display module 100 also includes a display panel 10 and a cover plate 20 arranged on the light-emitting side of the display panel 10. The display panel is bonded to the cover plate, and the display panel 10 includes a flexible organic light emitting diode display (OLED) panel, etc., and the flexible organic light emitting diode display panel has the properties of being foldable and bendable. The light-emitting side of the display panel 10 refers to the side of the display panel 10 used to display the 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 bonded to the cover plate 20 through a transparent adhesive layer, and the transparent adhesive layer includes OCA glue, etc. Of course, optionally, the display module 100 may also include a polarizer 50 arranged on the light-emitting side of the display panel 10, and a support member arranged on the side of the display panel away from the cover plate. The polarizer 50 is used to reduce the surface reflectivity of the display panel 10, and 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 includes the polarizer 50, the polarizer 50 may be located between the cover plate and the display panel. The support member is used to support the display panel 10. The material of the support member includes polyethylene terephthalate (PET) and the like.

[0048] The display panel 10 includes a first planar portion PP1 corresponding to the planar area and a first curved portion BP1 corresponding to the curved area, wherein the first curved portion BP1 includes a plurality of first side portions SP1 and a first corner portion JP1 connected between two adjacent first side portions SP1. The cover plate 20 includes a second planar portion PP2 corresponding to the first planar portion PP1 and a second curved portion BP2 corresponding to the first curved portion BP1, wherein the second curved portion BP2 includes a plurality of second side portions SP2 and a second corner portion JP2 connected between two adjacent second side portions SP2, wherein the second side portion SP2 is arranged corresponding to the first side portion SP1, and the second corner portion JP2 is arranged corresponding to the first corner portion JP1. Specifically, the first plane portion PP1 is fitted with the second plane portion PP2, and the first plane portion PP1 and the second plane portion PP2 are both located in the plane area; the first side portion SP1 is fitted with the second side portion SP2, the first corner portion JP1 is fitted with the second corner portion JP2, and the first side portion SP1, the second side portion SP2, the first corner portion JP1 and the second corner portion JP2 are all located in the curved surface area, wherein the first corner portion JP1 and the second corner portion JP2 are located in the Gaussian angle area.

[0049] Reference Figure 4 and Figure 5 The distance from each point on the first outer boundary OB1 of the first plane portion PP1 away from the first corner portion JP1 to a fixed point on the first side portion SP1 is a first distance L1, wherein the fixed point on the first side portion SP1 can be the intersection of the first outer boundary OB1 and the first side portion SP1, or can be any point on the boundary line between the first corner portion JP1 and the first side portion SP1, for example, can be the midpoint of the boundary line, and the present application does not make specific limitations.

[0050] The sinking distance of the first outer boundary OB1 relative to the first plane portion PP1 is the second distance L2, that is, the vertical distance from the first outer boundary OB1 to the plane where the first plane portion PP1 is located is the second distance L2, 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, and the first outer boundary OB1 is set inward relative to the second corner JP2 away from the second outer boundary OB4 of the second plane portion PP2, and the distance from the first outer boundary OB1 to the second outer boundary OB4 is the third distance L5, and the third distance L5 increases with the increase of the first distance L1, or the third distance L5 decreases with the increase of the first distance L1, thereby improving the matching of the display panel 10 and the cover plate 20, so that when the display panel 10 and the cover plate 20 are bonded, it is avoided that the first corner JP1 contacts the cover plate 20 before the first side SP1, causing wrinkles in the first corner JP1, thereby alleviating the problem of wrinkles easily appearing at the Gaussian surface when the existing four-curved screen is bonded. Among them, the first outer boundary OB1 refers to the outer contour of the first corner portion JP1 projected on the plane where the first plane portion PP1 is located, 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 dividing line between the first corner portion JP1 and the first plane portion PP1.

[0051] The change of the third distance as the first distance changes is negatively correlated with the change of the second distance as the first distance changes. Wherein, negative correlation in the present application 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. Correspondingly, the change of the third distance as the first distance changes is negatively correlated with the change of the second distance as the first distance changes, that is, the change direction of the third distance as the first distance changes is opposite to the change of the second distance as the first distance changes. 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 first corner JP1 can be better prevented from contacting the cover plate 20 before the first side SP1 when the display panel 10 and the cover plate 20 are attached, resulting in wrinkles on the first corner JP1, thereby alleviating the problem that wrinkles are easily formed at the Gaussian surface when the existing four-curved screen is attached. Of course, in some other embodiments, the third distance L5 can also increase as the second distance L2 decreases, which will not be repeated here.

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

[0054] Specifically, refer 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 same first side portion SP1, for example Figure 5As shown, the distances from multiple points 1P1, 2P1, 3P1, 4P1, 5P1, 6P1, and 7P1 on the first outer boundary OB1 to the fixed point P0 on the first side SP1, wherein the boundary between the first corner JP1 and one of the first sides SP1 is the first dividing line FL1, and the boundary between the first corner JP1 and another first side SP1 is the second dividing line FL2, points 1P1, 2P1, 3P1, 4P1, 5P1, 6P1, and 7P1 are respectively the intersections of the first dividing line FL1, the bisectors DL1, DL2, DL3, DL4, and DL5 of the first corner JP1, and the second dividing line FL2 with the first outer boundary OB1, and the fixed point P0 on the first side SP1 can be any point on the first dividing line FL1, for example, it can be the midpoint of the first dividing line FL1. As each point on the first outer boundary OB1 approaches the second dividing line FL2, the first distance L1 between each point on the first outer boundary OB1 and the fixed point P0 on the first side portion SP1 increases, and each point on the first outer boundary OB1 has a second distance L2 that is sunken relative to the first plane portion PP1, that is, each point on the first outer boundary OB1 has a second distance L2 to the plane where the first plane portion PP1 is located, and the second distance L2 increases as the first distance L1 increases, or the second distance L2 decreases as the first distance L1 increases.

[0055] In one embodiment, referring to Figures 2 to 7 , Figure 6 for Figure 3 Another detailed structural diagram of the first corner JP1 on the display panel 10 is shown in FIG. Figure 7 for Figure 6 The variation curve of the second distance L2 corresponding to each point on the first outer boundary OB1 is shown in FIG. Figure 6 , the boundary line between the first corner JP1 and one of the first side portions SP1 is the first boundary line FL1, and the boundary line between the first corner JP1 and another first side portion SP1 is the second boundary line FL2. The first corner JP1 is divided into n equal parts, where n is an integer greater than or equal to 2, and accordingly, (n-1) equal dividing lines are required. Wherein, dividing the first corner JP1 into n equal parts means dividing the first surface surrounded by the first outer boundary OB1, the first boundary line FL1, the first inner boundary IB1, and the second boundary line FL2 into n equal parts, and the first surface is also the upper surface of the first corner JP1 close to the cover plate 20, that is, the surface where the first corner JP1 is attached to the cover plate 20, and the first surface is located in the Gaussian angle area, and dividing the first surface into n equal parts can be achieved by dividing the Gaussian angle formed by the first corner JP1 into n equal parts, such as dividing the Gaussian angle into 15 degrees or other angles.

[0056] The first dividing line FL1, the second dividing line FL2 and each bisector intersect with the first outer boundary OB1 at a first intersection point respectively, and the sinking distance of each first intersection point relative to the first plane portion PP1 is the second distance L2, that is, the vertical distance from each first intersection point to the plane where the first plane portion PP1 is located is the second distance L2. For example, define (n-1) bisectors to be arranged in sequence, wherein the bisector close to the first dividing line FL1 is the first bisector, the bisector close to the second dividing line FL2 is the (n-1)th bisector, the intersection of the first dividing line FL1 and the first outer boundary OB1 is the first first intersection, then the intersection of the first bisector and the first outer boundary OB1 is the second first intersection, the intersection of the (n-1)th bisector and the first outer boundary OB1 is the nth first intersection, the intersection of the second dividing line FL2 and the first outer boundary OB1 is the (n+1)th first intersection, and the second distance L2 corresponding to the first intersection decreases as its value increases. The value of the first intersection refers to the order of the first intersection on the first outer boundary OB1, for example, the value of the first first intersection is 1, the value of the second first intersection is 2, and the value of the nth first intersection is n.

[0057] Optionally, the present application embodiment takes n as 6 as an example for illustration, referring to Figure 6 , the first corner JP16 is divided into equal parts, and correspondingly, five bisectors DL1, DL2, DL3, DL4, and DL5 are required, and the five bisectors are arranged in sequence from the first dividing line FL1 to the second dividing line FL2. It is defined that the first dividing line FL1 intersects with the first outer boundary OB1 at the first first intersection 1P1, the first bisector DL1 intersects with the first outer boundary OB1 at the second first intersection 2P1, then the second bisector DL2 intersects with the first outer boundary OB1 at the third first intersection 3P1, the third bisector DL3 intersects with the first outer boundary OB1 at the fourth first intersection 4P1, the fourth bisector DL4 intersects with the first outer boundary OB1 at the fifth first intersection 5P1, the fifth bisector DL5 intersects with the first outer boundary OB1 at the sixth first intersection 6P1, and the second dividing line FL2 intersects with the first outer boundary OB1 at the seventh first intersection 7P1. Each first intersection has a second distance L2 from the plane where the first plane portion PP1 is located, and the second distance L2 decreases as the value of the first intersection increases. Figure 7Of course, if the intersection of the second dividing line FL2 and the first outer boundary OB1 is defined as the first first intersection, then correspondingly, the order of other intersections on the first outer boundary OB1 also changes accordingly, for example, the intersection of the fifth bisector and the first outer boundary OB1 is the second first intersection, and so on. At this time, the second distance L2 increases with the increase of the value of the first intersection.

[0058] It can be understood that, according to the method of dividing the first corner JP1 into equal parts, the second corner JP2 is also divided into n equal parts, and the number of equal parts of the second corner JP2 is the same as the number of equal parts of the first corner JP1. For example, the second corner JP2 and the first corner JP1 are both divided into 6 equal parts, then the number of equally divided points on the second outer boundary OB4 of the second corner JP2 is also the same as the number of equally divided points on the first outer boundary OB1 of the first corner JP1, and they correspond one to one. The distance between the equally divided points on the first outer boundary OB1 to the corresponding equally divided points on the second outer boundary OB4 is the third distance L5, which will not be repeated here.

[0059] In one embodiment, referring to Figures 2 to 8 , Figure 8 This is a schematic diagram of a planar structure of the first corner portion JP1 in a flattened state provided in an embodiment of the present application. Figure 8, when the display panel 10 is in a flattened state, the outer boundary of the orthographic projection of the second corner JP2 on the horizontal plane where the display panel 10 is located is the third outer boundary OB2, and the outer boundary of the first corner JP1 is the fourth outer boundary OB3. The third outer boundary OB2 of the second corner JP2 exceeds the fourth outer boundary OB3 of the first corner JP1, the distance from the fourth outer boundary OB3 to the first side SP1 is the fourth distance L3, and the distance from the fourth outer boundary OB3 to the third outer boundary OB2 is the 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, and avoid the first corner JP1 from contacting the cover plate 20 before the first side SP1 when the display panel 10 and the cover plate 20 are attached, resulting in wrinkles on the first corner JP1, thereby alleviating the problem that wrinkles are easily formed at the Gaussian surface when the existing four-curved screen is attached. The third outer boundary OB2 refers to the outer contour of the orthographic projection of the second corner JP2 on the plane where the second planar portion PP2 is located, and the second inner boundary IB2 of the second corner JP2 is opposite to the third outer boundary OB2, and the second inner boundary IB2 is also the boundary between the second corner JP2 and the second planar portion PP2. In other words, the third outer boundary OB2 is also the orthographic projection of the second outer boundary OB4 on the plane where the second planar portion PP2 is located, or the orthographic 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 JP1 in the flattened state, and the third inner boundary IB3 of the first corner JP1 is opposite to the fourth outer boundary OB3, and the third inner boundary IB3 is also the boundary between the first corner 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 JP1 are all located on the same horizontal plane.

[0060] Specifically, refer 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 same first side portion SP1, for example Figure 8As shown, the distances from multiple points 1P2, 2P2, 3P2, 4P2, 5P2, 6P2, and 7P2 on the fourth outer boundary OB3 to the fixed points on the first side SP1, wherein the boundary line between the first corner JP1 and one of the first sides SP1 is the third dividing line FL3, and the boundary line with another first side SP1 is the fourth dividing line FL4, points 1P2, 2P2, 3P2, 4P2, 5P2, 6P2, and 7P2 are respectively the intersections of the third dividing line FL3, the bisectors DL1, DL2, DL3, DL4, and DL5 of the first corner JP1, and the fourth dividing line FL4 with the fourth outer boundary OB3, and the fixed point on the first side SP1 can be any point on the third dividing line FL3, for example, it can be the midpoint of the third dividing line FL3.

[0061] The distance from the fourth outer boundary OB3 to the third outer boundary OB2 refers to the distance from each point on the fourth outer boundary OB3 to the corresponding point on the third outer boundary OB2, for example Figure 8 As shown, the fifth distance L4 of the plurality of points 1P2, 2P2, 3P2, 4P2, 5P2, 6P2, 7P2 on the fourth outer boundary OB3 to the corresponding points 1P3, 2P3, 3P3, 4P3, 5P3, 6P3, 7P3 on the third outer boundary OB2 is respectively shown. The boundary line between the second corner JP2 and one of the second side portions SP2 is the fifth boundary line, and the boundary line between the second corner JP2 and another second side portion SP2 is the sixth boundary line. Points 1P3, 2P3, 3P3, 4P3, 5P3, 6P3, 7P3 are respectively the intersection points of the fifth boundary line, the bisectors DL1, DL2, DL3, DL4, DL5 of the first corner JP1, and the sixth boundary line with the third outer boundary OB2. Among them, the point on the third outer boundary OB2 corresponding to the point 1P2 on the fourth outer boundary OB3 is 1P3, the point 2P2 corresponds to the point 2P3, the point 3P2 corresponds to the point 3P3, and so on.

[0062] As each point on the fourth outer boundary OB3 approaches the fourth dividing line FL4, the fourth distance L3 between each point on the fourth outer boundary OB3 and the fixed point on the first side SP1 increases, and each point on the fourth outer boundary OB3 has a fifth distance L4 from the corresponding point on the third outer boundary OB2, and the fifth distance L4 increases as the fourth distance L3 increases, or the fifth distance L4 decreases as the fourth distance L3 increases.

[0063] Optionally, the change of the fifth distance L4 with the fourth distance L3 is negatively correlated with the change of the second distance L2 with the first distance L1. For example, 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 first corner JP1 can be better prevented from contacting the cover plate 20 before the first side SP1 when the display panel 10 and the cover plate 20 are attached, resulting in wrinkles on the first corner JP1, thereby alleviating the problem of wrinkles easily appearing at the Gaussian surface when the existing four-curved screen is attached.

[0064] In one embodiment, referring to Figures 2 to 10 , Fig. 9 Another schematic diagram of a planar structure of the first corner portion JP1 in a flattened state provided in an embodiment of the present application, Fig.10 for Fig. 9 The change curve diagram of the fifth distance L4 corresponding to each point on the fourth outer boundary OB3. Fig. 9 , when the display panel 10 is in a flattened state, the boundary between the first corner JP1 and one of the first sides SP1 is the third boundary FL3, the boundary between the first corner JP1 and another of the first sides SP1 is the fourth boundary FL4, the boundary between the second corner JP2 and one of the second sides SP2 is the fifth boundary, and the boundary between the second corner JP2 and another of the second sides SP2 is the sixth boundary, wherein the second boundary FL2 is connected to the third boundary FL3, and the sixth boundary is connected to the fourth boundary FL4. The first corner JP1 is divided into n equal parts, where n is an integer greater than or equal to 2, and accordingly, (n-1) equal dividing lines are required. The third dividing line FL3, the fourth dividing line FL4, and each of the equal dividing lines intersect with the fourth outer boundary OB3 at the second intersection, and intersect with the third outer boundary OB2 at the third intersection, respectively. The distance from each of the second intersections to the corresponding three intersections is the fifth distance L4.

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

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

[0067] Optionally, the present application embodiment takes n as 6 as an example for illustration, referring to Fig. 9 , the first corner JP16 is divided into equal parts, and correspondingly, five bisectors DL1, DL2, DL3, DL4, and DL5 are required, and the five bisectors are arranged in sequence from the third dividing line FL3 to the fourth dividing line FL4. It is defined that the third dividing line FL3 intersects with the fourth outer boundary OB3 at the first second intersection 1P2, the first bisector DL1 intersects with the fourth outer boundary OB3 at the second second intersection 2P2, then the second bisector DL2 intersects with the fourth outer boundary OB3 at the third second intersection 3P2, the third bisector DL3 intersects with the fourth outer boundary OB3 at the fourth second intersection 4P2, the fourth bisector DL4 intersects with the fourth outer boundary OB3 at the fifth second intersection 5P2, the fifth bisector DL5 intersects with the fourth outer boundary OB3 at the sixth second intersection 6P2, and the fourth dividing line FL4 intersects with the fourth outer boundary OB3 at the seventh second intersection 7P2.

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

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

[0070] In one embodiment, the sinking distance of the second outer boundary OB4 relative to the second plane portion PP2 is a sixth distance, and the sixth distance increases with the increase of the second distance L2 to further improve the matching of the display panel 10 and the cover plate 20.

[0071] Based on the same inventive concept, the present application also provides a cover laminating method for a flexible display module, referring to Figures 2 to 13 , Fig.11 A schematic diagram of a process for laminating a cover plate of a flexible display module provided in an embodiment of the present application. Fig.12 A schematic diagram comparing the first initial curve ML1 and the first target curve TL1 provided in an embodiment of the present application, Fig.13 A schematic diagram comparing the second initial curve ML2 and the second target curve TL2 provided in the embodiment of the present application. Fig.11 The cover plate bonding method of the flexible display module comprises the following steps:

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

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

[0074] S203: Align the display panel with the cover plate, and move the display panel and / or the cover plate so that the middle area is first bonded to the second plane portion to form a first plane portion, 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 then bonded to the second side on one side of the second corner portion, the second corner portion, and the second side on the other side of the second corner portion in sequence to form a first side portion, a first corner portion, and another first side portion, respectively, so that the display panel is bonded to the cover plate, a distance from a first outer boundary of the first corner portion away from the first plane portion to the first side portion is a first distance, a vertical distance of the first outer boundary relative to the first plane portion is a 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 retracted to the second outer boundary of the second corner portion away from the second plane portion, a distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases as the first distance increases, or the third distance decreases as the first distance increases.

[0075] Wherein, before providing the cover plate and the display panel, the following steps are also included:

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

[0077] Prepare a cover plate 20 according to a target cover plate model;

[0078] The display panel 10 is prepared according to a target display panel model.

[0079] Specifically, the steps of forming a target cover plate model and a target display panel model include:

[0080] A simulated cover plate model and a simulated display panel model are provided, wherein the simulated cover plate model comprises a first simulated plane portion and a first simulated curved portion located outside the first simulated plane portion, wherein the first simulated curved portion comprises a first simulated edge portion and a first simulated corner portion connected between two adjacent first simulated edge portions;

[0081] The simulated display panel model is laminated with the simulated cover plate model, so that the simulated display panel model is laminated with the first simulated plane portion, the first simulated corner portion, and the first simulated edge portion in sequence, and the simulated display panel model is laminated with the first simulated plane portion to form a second simulated plane portion, laminated with the first simulated corner portion to form a second simulated corner portion, and laminated with the first simulated edge portion to form a second simulated edge portion;

[0082] Draw a first initial curve ML1 according to the vertical distances from each point on the outer boundary of the second simulated corner portion to the plane where the second simulated plane portion is located;

[0083] The first target curve TL1 is generated according to the first initial curve ML1, so that the first target curve TL1 has an upward or downward trend, such as Fig.12 As shown;

[0084] The sizes of the simulated cover plate model and / or the simulated display panel model are adjusted according to the first target curve TL1 to form the target cover plate model and the target display panel model.

[0085] Optionally, after the step of laminating the simulated display panel model with the simulated cover plate model, the step further includes:

[0086] Draw a second initial curve ML2 according to the distance from the outer boundary of the second simulated corner to the outer boundary of the first simulated corner;

[0087] The second target curve TL2 is generated according to the second initial curve ML2, so that the second target curve TL2 has an upward or downward trend, and the upward and downward trend of the second target curve TL2 is opposite to that of the first target curve TL1. Fig.13 As shown;

[0088] The sizes of the simulated cover plate model and / or the simulated display panel model are 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, in the early stage of design, the wrinkle risk can be evaluated by simulating the displacement of the display panel, drawing the initial curve and the target curve, adjusting the size of the display panel and / or the cover plate to meet the target curve trend, improving the matching of the display panel 10 and the cover plate 20, and ensuring that the relative position of the display panel 10 and the cover plate 20 changes evenly to improve the wrinkle problem. This can also reduce the mold opening costs and production verification opportunities for the display panel 10 and the cover plate 20, thereby avoiding risks in the early stage of product design on the basis of reducing costs.

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

[0091] In a flexible display module and a cover plate bonding method for a flexible display module provided by the present application, the distance from each point on the first outer boundary of the first corner of the display panel away from the first planar 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 planar portion is located is a 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 set inward relative to the second outer boundary of the second corner of the cover plate, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases as the first distance increases, or the third distance decreases as the first distance increases, thereby improving the matching of the display panel and the cover plate, so that when the display panel and the cover plate are bonded, the first corner is prevented from contacting the cover plate before the first edge, resulting in wrinkles at the first corner, thereby alleviating the problem of wrinkles easily appearing at the Gaussian surface when the existing four-curved screen is bonded.

[0092] 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.

[0093] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. 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; 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 present application.

Claims

1. A flexible display module, characterized in that: The flexible display module comprises a flat surface area and a curved surface area outside the flat surface area; the flexible display module further comprises: A display panel, the display panel comprising a first planar portion arranged corresponding to the planar area and a first curved portion arranged corresponding to the curved area, the first curved portion comprising a plurality of first side portions and a first corner portion connected between two adjacent first side portions; a cover plate, arranged on a light-emitting side of the display panel, the display panel being attached to the cover plate, the cover plate comprising a second plane portion corresponding to the first plane portion, and a second corner portion corresponding to the first corner portion; Among them, the distance from each point on the first outer boundary of the first corner away from the first plane portion to a fixed point on the first side portion is a first distance, the sinking distance of the first outer boundary relative to the first plane portion 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 retracted relative to the second outer boundary of the second corner away from the second plane portion, 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.

2. The flexible display module according to claim 1, characterized in that: The change of the third distance with the first distance is negatively correlated with the change of the second distance with the first distance.

3. The flexible display module according to claim 2, characterized in that: The curvature of the middle area of ​​the first outer boundary is greater than the curvatures of the areas on both sides.

4. The flexible display module according to claim 3, characterized in that: The curvature of the middle area of ​​the second outer boundary is greater than the curvatures of the areas on both sides.

5. The flexible display module according to claim 3, characterized in that: The boundary line between the first corner and one of the first sides is the first boundary line, and the boundary line between the first corner and another first side is the second boundary line. The first corner is divided into n equal parts. The first boundary line, the second boundary line, and each of the equal dividing lines intersect with the first outer boundary at a first intersection point, respectively. The sinking distance of each of the first intersection points relative to the first plane portion is the second distance. Definition: (n-1) bisectors are arranged in sequence, wherein the bisector close to the first dividing line is the first bisector, and the bisector close to the second dividing line is the (n-1)th bisector, the intersection of the first dividing line and the first outer boundary is the first first intersection, the intersection of the first bisector and the first outer boundary is the second first intersection, the intersection of the (n-1)th bisector and the first outer boundary is the nth first intersection, and the intersection of the second dividing line and the first outer boundary is the (n+1)th first intersection, and the second distance corresponding to the first intersection decreases as its value increases.

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

7. The flexible display module according to claim 6, characterized in that: The change of the fifth distance with the fourth distance is negatively correlated with the change of the second distance with the first distance.

8. The flexible display module according to claim 7, characterized in that: When the display panel is in a flattened state, a boundary line between the first corner and one of the first sides is a third boundary line, and a boundary line between the first corner and another first side is a fourth boundary line, the first corner is divided into n equal parts, the third boundary line, the fourth boundary line, and each of the equally dividing lines intersect with the fourth outer boundary at a second intersection point, and intersect with the third outer boundary at a third intersection point, respectively, and the distance from each of the second intersection points to the corresponding three intersection points is the fifth distance; Definition: (n-1) bisectors are arranged in sequence, wherein the bisector close to the third dividing line is the first bisector, and the bisector close to the fourth dividing line is the (n-1)th bisector, the intersection of the third dividing line and the fourth outer boundary is the first second intersection, the intersection of the first bisector and the fourth outer boundary is the second second intersection, the intersection of the (n-1)th bisector and the fourth outer boundary is the nth second intersection, and the intersection of the fourth dividing line and the fourth outer boundary is the (n+1)th second intersection, and the fifth distance corresponding to the second intersection increases as its value increases.

9. The flexible display module according to any one of claims 1 to 8, characterized in that: The sinking distance of the second outer boundary relative to the second plane portion is a sixth distance, and the sixth distance increases as the second distance increases.

10. A cover plate laminating method for a flexible display module, characterized in that: include: Providing a cover plate, the cover plate comprising a second plane portion, and a second side portion and a second corner portion connected to a peripheral side of the second plane portion, wherein the second corner portion connects two adjacent second side portions; Providing a display panel, the display panel comprising a middle area and a side area and a corner area surrounding the middle area, wherein the corner area connects two adjacent side areas; 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 plane portion to form a first plane portion, 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 on one side of the second corner portion, the second corner portion, and the second side on the other side of the second corner portion to form a first side portion, a first corner portion, and another first side portion, respectively, so that the display panel is attached to the cover plate, the distance from the first outer boundary of the first corner away from the first plane portion to the first side portion is a first distance, the vertical distance of the first outer boundary relative to the first plane portion is a 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 retracted to the second outer boundary of the second corner away from the second plane portion, the distance from the first outer boundary to the second outer boundary is a third distance, the third distance increases as the first distance increases, or the third distance decreases as the first distance increases.

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