Flexible display panel and display device

Abstract

The invention provides a flexible display panel and a display device. The flexible display panel comprises a flexible display substrate and a polaroid. The flexible display substrate comprises at least two first areas and bending areas located between the adjacent first areas, and each bending area comprises a middle area and an edge area. The polarizer is located on the light emitting side of the flexible display substrate, the polarizer comprises a first polarization part corresponding to the bending area, the first polarization part comprises a first sub-polarization part corresponding to the edge area, the thickness of the first sub-polarization part is decreased in the first direction, and the first direction is the direction from the middle area to the edge area. In the flexible display panel, the thickness of the first sub-polarization part corresponding to the edge area of the bending area is reduced in the first direction, so that the problem that bubbles appear on the edge of the OCA layer due to crack extension on the first sub-polarization part is solved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular, to a flexible display panel and a display device. Background Art

[0002] At present, flexible display devices on the market, such as folding products, especially folding mobile phones, are prone to bubbles at the edge of the bending area after being bent a certain number of times. This may not only change the optical performance of the folding mobile phone, causing display problems such as inaccurate colors and uneven brightness, but also may affect the mechanical properties of the folding mobile phone, making the folding mobile phone more susceptible to damage during the bending process. Therefore, it is necessary to improve or eliminate the problem of bubbles at the edge of the bending area from the product design perspective to enhance the user experience of folding mobile phones. Summary of the invention

[0003] The present disclosure provides a flexible display panel and a display device, which reduce the strain of the first sub-polarizer by reducing the thickness of the first sub-polarizer in the edge area of ​​the bending area corresponding to the polarizer, thereby reducing the risk of crack extension around the first sub-polarizer, thereby improving the problem of bubbles appearing in the edge area of ​​the bending area due to crack extension.

[0004] The first aspect of the present disclosure provides a flexible display panel, which includes a flexible display substrate and a polarizer. The flexible display substrate includes at least two first areas and a bending area located between adjacent first areas, and the bending area includes an intermediate area and an edge area. The polarizer is located on the light-emitting side of the flexible display substrate, and the polarizer includes a first polarizing portion corresponding to the bending area, and the first polarizing portion includes a first sub-polarizing portion corresponding to the edge area, and the thickness of the first sub-polarizing portion decreases in a first direction, and the first direction is the direction from the intermediate area to the edge area.

[0005] In the above scheme, the stress distribution on the polarizer is improved by implementing differentiated design on the first sub-polarizer portion of the edge area and the portion of the middle area, thereby reducing the strain on the first sub-polarizer portion corresponding to the edge area of ​​the bending area and improving the problem of bubbles appearing at the edge of the bending area.

[0006] In a specific embodiment of the first aspect of the present disclosure, the first polarizing portion includes a second sub-polarizing portion corresponding to the middle area, the second sub-polarizing portion is connected to the first sub-polarizing portion in the first direction, and the thickness of at least part of the first sub-polarizing portion is less than the thickness of the second sub-polarizing portion.

[0007] In the above scheme, the design scheme of thinning the first sub-polarizer relative to the second sub-polarizer can not only reduce the problem of bubbles at the edge of the bending zone, but also reduce the extrusion force of the optical adhesive layer in subsequent processes such as when the cover is bonded, thereby further reducing the risk of bubbles at the edge of the bending zone.

[0008] Optionally, the first sub-polarizer includes a transition portion and a flat portion, the transition portion is smoothly connected to the second sub-polarizer, the flat portion is located on a side of the transition portion away from the second sub-polarizer, and a thickness of the flat portion is smaller than a thickness of the transition portion.

[0009] Optionally, the thickness of the transition portion gradually decreases in the first direction, and / or the thickness of the flat portion remains constant in the first direction.

[0010] Optionally, the thickness of the flat portion is 30% to 40% thinner than the thickness of the second sub-polarizing portion.

[0011] In a specific implementation of the first aspect of the present disclosure, the first surface of the transition portion facing away from the flexible display substrate is recessed toward the flexible display substrate.

[0012] In the above scheme, while it is beneficial to improve the problem of bubbles appearing at the edge of the bending area by reducing the strain on the first sub-polarizer, it is also beneficial to form a uniform optical adhesive layer during the subsequent cover plate bonding process to improve the quality of the flexible display panel.

[0013] Optionally, a cross-sectional shape of the first surface in a direction perpendicular to the flexible display substrate is a first arc shape, and the first arc shape extends in the first direction.

[0014] Optionally, the first surface in the first arc shape is smoothly connected to a surface corresponding to the flat portion.

[0015] In a specific implementation of the first aspect of the present disclosure, the second surface of the transition portion close to the flexible display substrate is recessed in a direction away from the flexible display substrate.

[0016] In the above solution, both sides of the first sub-polarizer are thinned, which not only improves the problem of bubbles at the edge of the bending area, but also avoids stress mutation on the first sub-polarizer, thereby improving the stability of the flexible display panel.

[0017] Optionally, a cross-sectional shape of the second surface in a direction perpendicular to the flexible display substrate is a second arc shape, and the second arc shape extends in the first direction.

[0018] Optionally, the second arc-shaped second surface is smoothly connected to a surface corresponding to the flat portion.

[0019] Optionally, the first surface in the first arc shape and the second surface in the second arc shape are symmetrically distributed relative to the central axis of the transition portion in the first direction.

[0020] In a specific embodiment of the first aspect of the present disclosure, the middle area of ​​the first area and the bending area constitutes a display area, the flexible display substrate further includes a non-display area located outside the first area, the non-display area and the edge area of ​​the bending area constitute a frame area, and the flexible display panel further includes an optical adhesive layer and an ink layer, the optical adhesive layer is located on the side of the polarizer away from the flexible display substrate, and covers the display area and the frame area. The ink layer is arranged on the side of the optical adhesive layer away from the flexible display substrate, and is located so that the orthographic projection of the ink layer on the flexible display substrate falls within the frame area. The orthographic projection of the edge area on the flexible display substrate falls within the orthographic projection of the ink layer on the flexible display substrate.

[0021] In the above solution, the design of the relative position of the ink layer and the edge area can improve the problem of bubbles appearing at the edge of the bending area without affecting the display effect of the flexible display panel.

[0022] Optionally, the edge regions are located on both sides of the middle region in a first direction, and the first regions are located on both sides of the middle region in a second direction, and the second direction is perpendicular to the first direction.

[0023] In a specific embodiment of the first aspect of the present disclosure, the flexible display panel also includes a support plate arranged on a side of the flexible display substrate away from the polarizer, the support plate includes a first support portion, the first support portion corresponds to the bending area, and a plurality of grooves are arranged on a surface of the first support portion away from the flexible display substrate; the orthographic projection of at least some of the grooves on the flexible display substrate falls on an edge area of ​​the bending area.

[0024] In a specific embodiment of the first aspect of the present disclosure, the thickness of at least a portion of the first sub-polarizer corresponding to the plurality of grooves decreases in a second direction, and the second direction is perpendicular to the first direction.

[0025] In the above solution, the solution of designing a groove on the first supporting portion of the supporting plate is beneficial to improving the bending performance and service life of the flexible display panel.

[0026] Optionally, the plurality of grooves are spaced apart in the second direction, and the thickness of the first polarizing portion decreases in the second direction.

[0027] In a specific implementation of the first aspect of the present disclosure, the first sub-polarizer forms a first recessed area on the third surface facing away from the flexible display substrate.

[0028] In the above solution, the design of the first recessed area is conducive to improving the problem of crack extension in the first sub-polarizer due to the corresponding groove design, thereby improving the problem of bubbles appearing at the edge of the bending area.

[0029] Optionally, the polarizer includes second polarizing portions, the second polarizing portions respectively correspond to the first areas and are located at both sides of the bending area, and the first concave areas are respectively smoothly connected to the second polarizing portions.

[0030] Optionally, a cross-sectional shape of the third surface in a direction perpendicular to the flexible display substrate is a first bowl shape.

[0031] In a specific implementation of the first aspect of the present disclosure, the first sub-polarizer forms a second recessed area on the fourth surface facing the flexible display substrate.

[0032] In the above solution, two surfaces of the first sub-polarizer in the second direction are respectively thinned, which not only ensures the reliability of the flexible display panel, but also effectively improves the problem of bubbles appearing at the edge of the bending area.

[0033] Optionally, the second recessed areas are smoothly connected to the second polarizing parts respectively.

[0034] Optionally, a cross-sectional shape of the fourth surface in a direction perpendicular to the flexible display substrate is a second bowl shape.

[0035] Optionally, the third surface in the first bowl shape and the fourth surface in the second bowl shape are symmetrically distributed relative to the central axis of the first sub-polarizer in the second direction.

[0036] Optionally, the thickness between the portion of the third surface corresponding to the first bowl-shaped bottom and the portion of the fourth surface corresponding to the second bowl-shaped bottom is thinner by 50% to 60% compared with the thickness of the second polarizing portion.

[0037] A second aspect of the present disclosure provides a display device, which includes the flexible display panel in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A cross-sectional schematic diagram of a flexible display panel provided by an embodiment of the present disclosure.

[0039] Figure 2 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of a flexible display panel in the M1N1 direction.

[0040] Figure 3 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of another flexible display panel in the M1N1 direction.

[0041] Figure 4 An embodiment of the present disclosure provides Figure 3 An enlarged view of point A in the cross-sectional schematic diagram of a flexible display panel in the M1N1 direction.

[0042] Figure 5 An embodiment of the present disclosure provides Figure 3An enlarged view of point A in the cross-sectional schematic diagram of another flexible display panel in the M1N1 direction.

[0043] Figure 6 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of another flexible display panel in the M1N1 direction.

[0044] Figure 7 An embodiment of the present disclosure provides Figure 6 An enlarged view of point B in the cross-sectional schematic diagram of a flexible display panel in the M1N1 direction.

[0045] Figure 8 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of another flexible display panel in the M1N1 direction.

[0046] Fig. 9 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of a flexible display panel in the M2N2 direction.

[0047] Fig.10 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional view of another flexible display panel in the M2N2 direction.

[0048] Reference numerals:

[0049] 100-flexible display substrate; 110-first zone; 120-bending zone; 121-middle zone; 122-edge zone; AA-display zone; BA-frame zone; NA-non-display zone; 200-polarizer; 201-first polarizing portion; 210-first sub-polarizing portion; 211-transition portion; 211a-first surface; 211b-second surface; 212-flat portion; 220-second sub-polarizing portion; thickness of transition portion - H1; thickness of flat portion - H2; 202-second polarizing portion; 230-third surface; 240-fourth surface; 300-pressure-sensitive adhesive layer; 400-optical adhesive layer; 500-ink layer; 600-cover plate; 700-support plate; 710-first support portion; 711-groove. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] In flexible display devices such as folding products, specifically folding mobile phones, polarizers are set on the display light-emitting side to improve the visual effect of folding mobile phones. However, during the processing of the polarizer, due to the material characteristics of the polarizer itself, such as the heat absorption characteristics of the material, the thermal conductivity of the material, the laser energy and the cutting speed, a carbonized zone is formed at the cutting edge of the polarizer, and a large temperature gradient is formed between the carbonized zone and the surrounding uncarbonized area, which causes uneven thermal expansion of the polarizer material, thereby causing internal thermal stress, which causes microcracks in the carbonized zone. In addition, the material structure of the carbonized zone of the polarizer changes, specifically due to embrittlement caused by carbonization. This embrittlement makes the material of the polarizer more prone to cracks when subjected to external forces or internal stresses during the cutting process. Therefore, microcracks will appear in the carbonized zone of the polarizer when it is cut, which is unavoidable due to laser cutting.

[0052] However, under the influence of the micro cracks in the above-mentioned cut carbonized zone, for some products with relatively small bending radius or stacked products under greater force, during the bending process, the polarizer will have cracks that worsen at the left and right edges of the center of the bending zone (the point where the film is subjected to the greatest force). The micro cracks in the cut carbonized zone of the polarizer will gradually spread to the display area of ​​the product, and the polarizer film will crack and bend. This will cause bubbles to appear in the adhesive material on the light-emitting side of the polarizer, such as the optically clear adhesive (OCA) layer, that is, the portion of the OCA layer corresponding to the edge area, that is, bubbles will appear at the edge of the bending zone, thereby affecting product quality.

[0053] In view of this, the embodiments of the present disclosure provide a flexible display panel and a display device, the flexible display panel including a flexible display substrate and a polarizer. The flexible display substrate includes at least two first areas and a bending area located between adjacent first areas, the bending area including a middle area and an edge area. The polarizer is located on the light-emitting side of the flexible display substrate, the polarizer includes a first polarizing portion corresponding to the bending area, the first polarizing portion includes a first sub-polarizing portion corresponding to the edge area, and the thickness of the first sub-polarizing portion decreases in a first direction, the first direction being the direction from the middle area to the edge area. In this way, the thickness of the first sub-polarizing portion corresponding to the edge area of ​​the bending area becomes thinner, and the polarizer and the first sub-polarizing portion of the edge area and the part of the middle area are differentiated, the stress distribution on the polarizer is improved, the strain amount on the first sub-polarizing portion corresponding to the edge area of ​​the bending area is reduced, and the deformation of the first sub-polarizing portion is reduced, thereby reducing the risk of microcracks on the part of the polarizer corresponding to the edge area, that is, the first sub-polarizing portion, extending to the middle area, thereby improving the problem of bubbles in the partial area of ​​the edge area corresponding to the OCA, and improving the quality of the flexible display panel.

[0054] In the following, the flexible display panel and the display device according to at least one embodiment of the present disclosure are described in conjunction with the accompanying drawings. In addition, as shown in the accompanying drawings, in at least one embodiment of the present disclosure, a spatial rectangular coordinate system is established with the surface where the flexible display panel is located as a reference to define the positions of the various film layers in the flexible display panel. In the spatial rectangular coordinate system, the X-axis and the Z-axis are parallel to the surface where the flexible display panel is located, and the Y-axis is perpendicular to the surface where the flexible display panel is located.

[0055] For example, Figure 1 and Figure 2 As shown, the flexible display panel includes a flexible display substrate 100 and a polarizer 200 .

[0056] The flexible display substrate 100 includes two first areas 110 and a bending area 120 located between the two first areas 110. The bending area 120 is an important part that enables the corresponding flexible display panel to achieve deformation operations such as bending and folding. The bending area 120 includes a middle area 121 and an edge area 122. The flexible display substrate 100 has good mechanical properties and can withstand repeated bending and folding operations without being easily broken or deformed. The material of the flexible display substrate 100 includes but is not limited to polyimide (PI) and polyethylene terephthalate (PET).

[0057] The polarizer 200 is attached to the light-emitting side of the flexible display panel. Specifically, the polarizer 200 is attached to the light-emitting side of the flexible display panel by a pressure-sensitive adhesive. Figure 3 As shown, a pressure-sensitive adhesive layer 300, namely an OCA layer, is provided between the flexible display substrate 100 and the polarizer 200. The polarizer 200 includes a first polarizer 201 corresponding to the bending area 120, and the first polarizer 201 includes a first sub-polarizer 210 corresponding to the edge area 122, and the thickness of the first sub-polarizer 210 decreases in a first direction, and the first direction is the direction from the middle area 121 to the edge area 122.

[0058] When the microcracks in the cut carbonized area of ​​the first sub-polarizer 210 of the polarizer 200 extend to the middle area 121 corresponding to the bending area 120, cracks are twisted, which will become a channel for air to penetrate into the OCA layer. Since the OCA in the OCA layer is viscous, air cannot circulate in the OCA layer, so it will gather in the part of the OCA layer corresponding to the edge area 122 to form bubbles, which not only destroys the structural integrity between the OCA layer and the polarizer 200 in the corresponding area, causing the problem of local lamination failure, but also may affect the local viscosity of the OCA layer, and finally cause OCA failure, affecting the quality of the flexible display panel. By thinning the thickness of the first sub-polarizer 210, the strain amount on the edge area 122 of the polarizer 200 corresponding to the bending area 120, that is, the first sub-polarizer 210, is reduced, and the microcracks on the first sub-polarizer are reduced. Extending inward (referring to the direction of the middle area 121) reduces the risk of OCA failure and improves the quality of the flexible display panel.

[0059] It should be noted that the structure of the flexible display panel in the embodiment of the present disclosure is not limited to the above examples, and it may also include other structures. For example, the polarizer 200 is not bonded to the flexible display substrate 100 by PSA, but is implemented by other means such as vacuum bonding. For example, the number of the first zones 110 is not limited to two in the above example, but can also be set to three, four or more, and the corresponding number of bending zones 120 can be set to two, three or more. For another example, the first zone 110 and the bending zone 120 can be designed to have a display function according to the requirements. Specifically, the first zone 110 has a display function or the first zone 110 and the bending zone 120 both have a display function. In addition, the film structure of the polarizer 200 can be designed according to actual needs, which will not be elaborated here.

[0060] Based on the above embodiments, the embodiment of the present disclosure further designs a solution in which the thickness of the first sub-polarizer 210 becomes smaller in the first direction, and the specific contents are as follows.

[0061] In a flexible display panel provided in an embodiment of the present disclosure, Figure 3 As shown, the first polarizing portion 201 includes a second sub-polarizing portion 220 corresponding to the middle area 121 , and in the first direction, the second sub-polarizing portion 220 is connected to the first sub-polarizing portion 210 , and at least part of the thickness of the first sub-polarizing portion 210 is less than the thickness of the second sub-polarizing portion 220 .

[0062] For example, Figure 3As shown, the flexible display panel includes a flexible display substrate 100, a pressure-sensitive adhesive layer 300 (PSA layer), and a polarizer 200 stacked in sequence. The flexible display substrate 100 includes a bending area 120, which includes a middle area 121 and an edge area 122, and the edge areas 122 are relatively arranged on both sides of the middle area 121. The polarizer 200 includes a first polarizing portion 201 corresponding to the bending area 120, that is, the orthographic projection of the first polarizing portion 201 on the flexible display substrate 100 coincides with the bending area 120, the first polarizing portion 201 includes a first sub-polarizing portion 210 corresponding to the edge area 122 of the bending area 120 and a second sub-polarizing portion 220 corresponding to the middle area 121 of the bending area 120, and in the first direction from the middle area 121 to the edge area 122, that is, the X direction in the figure, the second sub-polarizing portion 220 is connected to the first sub-polarizing portion 210, and at least part of the thickness of the first sub-polarizing portion is less than the thickness of the second sub-polarizing portion 220. In this way, the first sub-polarizer 210 of the middle area 121 of the bending area 120 of the polarizer 200 and the second sub-polarizer 220 of the edge area 122 of the bending area 120 are designed differently, reducing the probability of the microcracks in the cut carbonized area at the edge of the polarizer 200 extending to the middle area 121, thereby reducing the passage of air into the corresponding adhesive layer, such as the OCA layer, and thus improving the problem of bubbles generated at the edge of the OCA layer. In addition, the thickness of the first sub-polarizer 210 becomes thinner, and the corresponding extrusion of the OCA layer in the later process, such as when the cover plate 600 is attached, becomes smaller, which is conducive to the discharge of bubbles in the OCA layer, thereby reducing the generation of bubbles at the edge.

[0063] Based on the above embodiments, in the flexible display panel, there are various specific implementations in which the thickness of at least a portion of the first sub-polarizer 210 is smaller than the thickness of the second sub-polarizer 220 .

[0064] For example, in the flexible display panel provided by at least one embodiment of the present disclosure, Figure 3 , Figure 4 and Figure 5As shown, the first sub-polarizer 210 includes a transition portion 211 and a flat portion 212, the transition portion 211 is smoothly connected to the second sub-polarizer 220, the flat portion 212 is located on the side of the transition portion 211 away from the second sub-polarizer 220, and the thickness of the flat portion 212 is less than the thickness of the transition portion 211. In this way, although the thickness of the first sub-polarizer 210 becomes thinner relative to the thickness of the second sub-polarizer 220, its change is not abrupt, but the step difference is eliminated through the transition portion 211, so as to avoid the problem of sudden stress change at the junction of the first sub-polarizer 210 and the second sub-polarizer 220 and at the junction of the transition portion 211 and the flat portion 212 due to the step difference. In addition, eliminating the step difference at the above two positions can also avoid the problem of uneven filling of the OCA optical glue due to the step difference in subsequent processes, such as when the cover plate 600 is attached, resulting in gaps and edge bubbles. Therefore, the risk of edge bubbles in the flexible display panel is further reduced.

[0065] Meanwhile, based on the above embodiments, the embodiment of the present disclosure also specifically introduces the thickness variation of the transition portion 211 and the flat portion 212 , as follows.

[0066] For example, in a flexible display panel provided in an embodiment of the present disclosure, Figure 4 As shown, the thickness H1 of the transition portion gradually decreases in the first direction, the flat portion 212 is naturally connected to the transition portion 211 , and the thickness also gradually decreases, and the thickness change rate of the flat portion 212 is less than or equal to the thickness change rate of the transition portion 211 .

[0067] For another example, in a flexible display panel provided in another embodiment of the present disclosure, Figure 5 As shown, the thickness H1 of the transition portion 211 gradually decreases in the first direction, ie, the X direction, and the thickness H2 of the flat portion remains unchanged in the first direction, ie, the X direction.

[0068] Based on the above embodiments, in a flexible display panel provided in one embodiment of the present disclosure, as Figure 5 As shown, in the flexible display panel, the thickness of the transition portion 211 of the first sub-polarizer 210 gradually decreases in the X direction, the thickness of the flat portion 212 of the first sub-polarizer 210 is less than the thickness of the transition portion 211, the thickness of the flat portion 212 is constant in the X direction, and the thickness of the flat portion 212 is 30% to 40% thinner than the thickness of the second sub-polarizer 220, and the thickness of the second sub-polarizer 220 is equal to the maximum thickness of the transition portion 211, that is, H1 in the figure. Specifically, the thickness of the flat portion 212 is 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, and 39% thinner than the thickness of the second sub-polarizer 220.

[0069] It should be noted that the thickness of the transition portion 211 and the thickness of the flat portion 212 mentioned in the above embodiment are not limited to the maximum thickness of the transition portion 211 and the maximum thickness of the flat portion 212 in the above figure, but may also refer to the average thickness of the transition portion 211 and the average thickness of the flat portion 212, etc.

[0070] In a flexible display panel provided in an embodiment of the present disclosure, Figure 4 and Figure 5 As shown, the first surface 211 a of the transition portion 211 facing away from the flexible display substrate 100 is recessed toward the flexible display substrate 100 .

[0071] In the flexible display panel provided by at least one embodiment of the present disclosure, the cross-sectional shape of the first surface 211 a in a direction perpendicular to the flexible display substrate 100 is a first arc shape, and the first arc shape extends in the first direction.

[0072] In the flexible display panel provided by at least one embodiment of the present disclosure, the first surface 211 a in the first arc shape is smoothly connected to the surface corresponding to the flat portion 212 .

[0073] For example, Figure 4 and Figure 5 It can be seen that in the flexible display panel, the first sub-polarizer 210 includes a transition portion 211 and a flat portion 212. In the first direction, i.e., the X direction, the transition portion 211 deviates from the first surface 211a of the flexible display substrate 100 and is recessed in the direction of the flexible display substrate 100 to form a first arc. The first arc extends in the X direction, smoothly connecting the corresponding surface of the second sub-polarizer 200 and the surface corresponding to the flat portion 212, eliminating the step difference caused by the thickness change. In this way, the design scheme that the first surface 211a of the transition portion 211 is in the first arc shape is conducive to the uniform distribution of stress on the transition portion 211, reducing the risk of crack extension, and is also conducive to the uniform distribution of optical glue, i.e., OCA glue, in subsequent processes, such as when the cover plate 600 is attached, improving the bonding strength between the OCA layer and the polarizer 200, and reducing the risk of bubbles appearing at the edge of the OCA layer.

[0074] The structure of the flexible display panel in the embodiments of the present disclosure is not limited to the above embodiments, and may also include other design schemes.

[0075] For example, in a flexible display panel provided by another embodiment of the present disclosure, a second surface 211 b of the transition portion 211 close to the flexible display substrate 100 is recessed in a direction away from the flexible display substrate 100 .

[0076] In the flexible display panel provided by at least one embodiment of the present disclosure, the cross-sectional shape of the second surface in a direction perpendicular to the flexible display substrate 100 is a second arc shape, and the second arc shape extends in the first direction.

[0077] In the flexible display panel provided by at least one embodiment of the present disclosure, the second surface 211 b in the second arc shape is smoothly connected to the surface corresponding to the flat portion 212 .

[0078] In the flexible display panel provided by at least one embodiment of the present disclosure, the first surface 211 a in the first arc shape and the second surface 211 b in the second arc shape are symmetrically distributed relative to the central axis of the transition portion 211 in the first direction.

[0079] For example, Figure 6 and Figure 7 As shown, in the flexible display substrate 100, the first sub-polarizer 210 includes a first surface 211a away from the flexible display substrate 100 and a second surface 211b facing the flexible display substrate 100, that is, the first surface 211a and the second surface 211b are arranged opposite to each other. The first surface 211a is concave in the direction of the second surface 211b to form a first arc, and the second surface 211b is concave in the direction of the first surface 211a to form a second arc, and the distance between the first arc and the second arc in the Y direction is the thickness of the transition part 211. The first surface 211a and the second surface 211b extend in the first direction respectively, and the two ends of each arc-shaped surface are smoothly connected to the corresponding surfaces of the second sub-polarizer 200 and the flat part 212 respectively. At the same time, the first surface 211a and the second surface 211b are symmetrically distributed relative to the central axis X1 of the transition part 211 in the first direction, that is, the X direction. In this way, by simultaneously thinning both sides of the first sub-polarizer 210 relative to the flexible display panel, the problem of stress mutation or stress concentration caused by thinning on one side can be avoided, thereby improving the quality of the flexible display panel.

[0080] Based on the above embodiments, in the flexible display panel provided by at least one embodiment of the present disclosure, Figure 1 and Figure 8As shown, the middle area 121 formed by the first area 110 and the bending area 120 constitutes a display area AA, and the display area AA has a graphic display function and other functions such as touch control. The flexible display substrate 100 also includes a non-display area NA located outside the first area 110, and the non-display area NA and the edge area 122 of the bending area 120 constitute a frame area BA. In addition to mechanically supporting and protecting the display area AA, the frame area BA can also realize functions such as signal transmission and control through wiring. The flexible display panel also includes an optical adhesive layer 400 and an ink layer 500. The optical adhesive layer 400 is located on the side of the polarizer 200 away from the flexible display substrate 100, and covers the display area AA and the frame area BA. The ink layer 500 is arranged on the side of the optical adhesive layer 400 away from the flexible display substrate 100, and the orthographic projection of the ink layer 500 on the flexible display substrate 100 falls within the frame area BA. The orthographic projection of the edge area 122 on the flexible display substrate 100 falls within the orthographic projection of the ink layer 500 on the flexible display substrate. In this way, the design of the first sub-polarizer 210 corresponding to the ink layer 500 will not affect the display effect of the display area AA, such as the lighting visual effect.

[0081] The embodiments of the present disclosure do not specifically limit the size of the film layer involved in the above structure. For example, the width of the ink layer 500, that is, the length in the X direction, is 600μm to 800μm. Specifically, the width of the ink layer 500 is 610μm, 620μm, 630μm, 640μm, 650μm, 660μm, 670μm, 680μm, 690μm, 700μm, 710μm, 720μm, 730μm, 740μm, 750μm, 760μm, 770μm, 780μm, and 790μm. The width of the first sub-polarizer 210, i.e., the length in the X direction, is equal to the width of the ink layer 500, and the width of the flat portion 212 of the first sub-polarizer 210 is 300 μm to 400 μm. Specifically, the width of the flat portion 212 is 310 μm, 320 μm, 330 μm, 340 μm, 350 μm, 360 μm, 370 μm, 380 μm, and 390 μm.

[0082] Based on the above embodiments, in the flexible display panel provided by at least one embodiment of the present disclosure, Figure 1 As shown, the edge regions 122 are located on both sides of the middle region 121 in the first direction, and the first regions 110 are located on both sides of the middle region 121 in the second direction, and the second direction is perpendicular to the first direction.

[0083] Based on the above embodiments, in a flexible display panel provided in one embodiment of the present disclosure, as Figure 1 , Figure 2 and Fig.10As shown, the flexible display panel includes a support plate 700, a flexible display substrate 100, a pressure-sensitive adhesive layer 300, a polarizer 200, an optical adhesive layer 400, an ink layer 500 and a cover plate 600 stacked in sequence. The support plate 700 on the side of the flexible display substrate 100 away from the polarizer 200. The support plate 700 includes a first support portion 710, the first support portion 710 corresponds to the bending area 120, and a plurality of grooves 711 are arranged on the surface of the first support portion 710 away from the flexible display substrate 100, and at least part of the grooves 711 are projected on the flexible display substrate 100 on the edge area 122 of the bending area 120. In this way, the grooves 711 on the support plate 700 provide a certain amount of deformation margin for the support plate 700 when it is bent, and also play a role in dispersing stress and avoiding stress concentration.

[0084] In the flexible display panel provided by at least one embodiment of the present disclosure, the thickness of at least a portion of the first sub-polarizer 210 corresponding to the plurality of grooves 711 decreases in the second direction, i.e., the Z direction. The thickness of the first sub-polarizer 210 corresponding to the thickness of the grooves 711 in the second direction becomes thinner, which can improve the problem of bubbles or failure at the edge of the OCA layer caused by the deterioration of the edge cracks of the first sub-polarizer 210 corresponding to the periphery of the grooves 711.

[0085] In the flexible display panel provided by at least one embodiment of the present disclosure, the plurality of grooves 711 are spaced apart in the second direction, and the thickness of the first polarizer 201 decreases in the second direction.

[0086] In the flexible display panel provided by an embodiment of the present disclosure, the first sub-polarizer 210 is away from the third surface 230 of the flexible display substrate 100 to form a first recessed area.

[0087] For example, Figure 1 and Fig. 9As shown, the flexible display panel includes a support plate 700, a flexible display substrate 100, a pressure-sensitive adhesive layer 300, a polarizer 200, an optical adhesive layer 400, an ink layer 500 and a cover plate 600 stacked in sequence. The support plate 700 includes a first support portion 710 corresponding to the bending area 120 of the flexible display panel, and a groove 711 is provided on the side of the first support portion 710 away from the flexible display substrate 100, and the opening of each groove 711 is away from the flexible display substrate 100. A plurality of grooves 711 are arranged at intervals, and the spacing between adjacent grooves 711 is equal or approximately equal. The thickness of the first sub-polarizer 210 corresponding to the plurality of grooves 711 decreases in the second direction. At the same time, the thickness of the first sub-polarizer 210 decreases in the first direction. For its specific introduction, please refer to the above embodiment, which will not be repeated here. Thus, the design of the first recessed area makes the thickness of the first sub-polarizer 210 in the second direction first decrease and then increase, thereby reducing the step difference between the first sub-polarizer 210 and the part of the polarizer 200 corresponding to the first area 110 in the second direction, ie, the Z direction.

[0088] In the flexible display panel provided by at least one embodiment of the present disclosure, Figure 1 and Fig. 9 As shown, the polarizer 200 includes a second polarizer 202, which corresponds to the first area 110 and is located on both sides of the bending area 120, and the first concave area is smoothly connected to the second polarizer 202. In this way, the step difference at the junction of the first sub-polarizer 210 and the second polarizer 202 is eliminated, thereby more effectively improving the problem of crack extension in the area corresponding to the multiple grooves 711 on the support plate 700, and also effectively improving the problem of stress concentration on the first polarizer 201, thereby improving the quality of the flexible display panel.

[0089] In the flexible display panel provided by at least one embodiment of the present disclosure, the cross-sectional shape of the third surface 230 in the direction perpendicular to the flexible display substrate 100 is a first bowl shape. In this way, the thickness of the bowl bottom portion corresponding to the first bowl shape remains unchanged, and the bowl wall of the first bowl shape extends along the bowl bottom to the second polarizing parts 202 on both sides respectively, and is smoothly connected to the second polarizing parts 202 respectively, thereby improving the problem of bubbles appearing at the edge of the optical adhesive layer 400 in contact with the third surface 230.

[0090] Based on the above embodiments, in a flexible display panel provided in another embodiment of the present disclosure, the first sub-polarizer 210 forms a second recessed area toward the fourth surface 240 of the flexible display substrate 100 .

[0091] In the flexible display panel provided by at least one embodiment of the present disclosure, the second recessed area is smoothly connected to the first area 110 on both sides of the bending area 120 respectively.

[0092] In the flexible display panel provided by at least one embodiment of the present disclosure, the cross-sectional shape of the fourth surface 240 in a direction perpendicular to the flexible display substrate 100 is a second bowl shape.

[0093] For example, Figure 1 and Fig.10 As shown, the flexible display panel includes a flexible display substrate 100, a polarizer 200 and a support plate 700. The support plate 700 is located on the side of the flexible display substantially away from the polarizer 200, and includes a first support portion 710 corresponding to the bending area 120 of the flexible display substrate 100, and a plurality of grooves 711 are arranged on the first support portion 710, and the opening of each groove 711 is arranged away from the polarizer 200. The polarizer 200 includes a first polarizer 201 corresponding to the bending area 120 of the flexible display substrate 100 and a second polarizer 202 corresponding to the first area 110 of the flexible display substrate 100, and the second polarizer 202 is respectively located on both sides of the first polarizer 201 in the second direction, i.e., the Y direction. The first polarizer 201 includes a first sub-polarizer 210 corresponding to the edge area 122 of the bending area 120. The first sub-polarizer 210 includes a third surface 230 away from the flexible display substrate 100 and a fourth surface 240 close to the flexible display substrate 100. The third surface 230 forms a first concave area that is concave toward the fourth surface 240, and the cross-sectional shape of the first concave area in the Y direction is a first bowl shape, and the fourth surface 240 forms a second concave area that is concave toward the third surface 230, and the cross-sectional shape of the second concave area in the Y direction is a second bowl shape. In this way, both sides of the first sub-polarizer 210 in the Y direction are thinned at the same time to avoid the problem of sudden stress change or stress concentration on the first sub-polarizer 210.

[0094] The disclosed embodiment does not specifically limit the third surface 230 and the fourth surface 240. Specifically, the third surface 230 includes part or all of the surface of the first surface 211a after it is concave into the first arc shape, and the fourth surface 240 includes part or all of the surface of the second surface 211b after it is concave into the second arc shape. In addition, the third surface 230 may also include other parts, such as the part or all of the surface corresponding to the flat part in the first direction and the first surface, and the fourth surface 240 may also include other surfaces, such as the part or all of the surface corresponding to the flat part in the first direction and the first surface. This can be designed according to actual needs and will not be elaborated here.

[0095] The above example does not limit the thickness variation of the first sub-polarizer 210 in the flexible display panel in the first direction. For details, please refer to the above embodiments, which will not be described in detail here.

[0096] In the flexible display panel provided by at least one embodiment of the present disclosure, Fig.10As shown, the third surface 230 in the first bowl shape and the fourth surface 240 in the second bowl shape are symmetrically distributed relative to the central axis of the first sub-polarizer 210 in the second direction.

[0097] In the flexible display panel provided by at least one embodiment of the present disclosure, the thickness between the portion of the third surface 230 corresponding to the first bowl-shaped bottom and the portion of the fourth surface 240 corresponding to the second bowl-shaped bottom, that is, the distance between the third bowl-shaped bottom and the fourth bowl-shaped bottom, is thinner by 50% to 60% compared to the thickness of the second polarizing portion 202. Specifically, it can be thinned by 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, or 59%.

[0098] An embodiment of the present disclosure further provides a display device, which includes the flexible display panel in the above embodiment.

[0099] In an embodiment of the present disclosure, the display device may be an organic light emitting diode display device, a liquid crystal display device, an electronic paper display device, or the like.

[0100] For example, the display device in the embodiments of the present disclosure may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, or the like.

[0101] It should be noted that the embodiments of the present disclosure do not describe all structures of the above-mentioned flexible display panel. To realize the necessary functions of the flexible display panel, those skilled in the art may set other structures according to specific application scenarios.

[0102] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A flexible display panel, characterized in that: include: A flexible display substrate, comprising at least two first regions and a bending region located between adjacent first regions, wherein the bending region comprises a middle region and an edge region; as well as A polarizer is located on the light-emitting side of the flexible display substrate, wherein the polarizer includes a first polarizing portion corresponding to the bending area, the first polarizing portion includes a first sub-polarizing portion corresponding to the edge area, and the thickness of the first sub-polarizing portion decreases in a first direction, and the first direction is the direction from the middle area to the edge area.

2. The flexible display panel according to claim 1, characterized in that: The first polarizing portion includes a second sub-polarizing portion corresponding to the middle area, and the second sub-polarizing portion is connected to the first sub-polarizing portion in the first direction, and The thickness of at least a portion of the first sub-polarizer is smaller than the thickness of the second sub-polarizer; Preferably, the first sub-polarizer includes a transition portion and a flat portion, the transition portion is smoothly connected to the second sub-polarizer, the flat portion is located on a side of the transition portion away from the second sub-polarizer, and the thickness of the flat portion is less than the thickness of the transition portion; Preferably, the thickness of the transition portion gradually decreases in the first direction, and / or the thickness of the flat portion remains unchanged in the first direction; Preferably, the thickness of the flat portion is 30% to 40% thinner than the thickness of the second sub-polarizing portion.

3. The flexible display panel according to claim 2, characterized in that: The first surface of the transition portion facing away from the flexible display substrate is recessed toward the flexible display substrate; Preferably, the cross-sectional shape of the first surface in a direction perpendicular to the flexible display substrate is a first arc shape, and the first arc shape extends in the first direction; Preferably, the first surface in the first arc shape is smoothly connected to a surface corresponding to the flat portion.

4. The flexible display panel according to claim 3, characterized in that: The second surface of the transition portion close to the flexible display substrate is recessed in a direction away from the flexible display substrate; Preferably, the cross-sectional shape of the second surface in a direction perpendicular to the flexible display substrate is a second arc shape, and the second arc shape extends in the first direction; Preferably, the second surface in the second arc shape is smoothly connected to the surface corresponding to the flat portion; Preferably, the first surface in the first arc shape and the second surface in the second arc shape are symmetrically distributed relative to a central axis of the transition portion in the first direction.

5. The flexible display panel according to any one of claims 1 to 4, characterized in that: The first area and the middle area of ​​the bending area constitute a display area, the flexible display substrate further comprises a non-display area located outside the first area, the non-display area and the edge area of ​​the bending area constitute a frame area, and the flexible display panel further comprises: an optical adhesive layer, located on a side of the polarizer away from the flexible display substrate and covering the display area and the frame area; and An ink layer is disposed on a side of the optical adhesive layer away from the flexible display substrate, and an orthographic projection of the ink layer on the flexible display substrate falls within the frame area; Wherein, the orthographic projection of the edge area on the flexible display substrate falls within the orthographic projection of the ink layer on the flexible display substrate; Preferably, the edge regions are located on both sides of the middle region in the first direction, and the first regions are located on both sides of the middle region in a second direction, and the second direction is perpendicular to the first direction.

6. The flexible display panel according to claim 5, characterized in that: The flexible display panel further includes: A support plate, arranged on a side of the flexible display substrate away from the polarizer, the support plate comprising a first support portion, the first support portion corresponds to the bending area, and a plurality of grooves are arranged on a surface of the first support portion away from the flexible display substrate; Wherein, at least a portion of the orthographic projection of the groove on the flexible display substrate falls on the edge area of ​​the bending area.

7. The flexible display panel according to claim 6, characterized in that: The thickness of at least a portion of the first sub-polarizer corresponding to the plurality of grooves decreases in the second direction; Preferably, the plurality of grooves are spaced apart in the second direction, and the thickness of the first polarizing portion decreases in the second direction.

8. The flexible display panel according to claim 7, characterized in that: The first sub-polarizing portion is away from the third surface of the flexible display substrate to form a first concave area; Preferably, the polarizer includes a second polarizing portion, the second polarizing portions correspond to the first areas respectively and are located on both sides of the bending area, and the first concave areas are smoothly connected to the second polarizing portions respectively; Preferably, the cross-sectional shape of the third surface in a direction perpendicular to the flexible display substrate is a first bowl shape.

9. The flexible display panel according to claim 8, characterized in that: The first sub-polarizer forms a second concave area toward the fourth surface of the flexible display substrate; Preferably, the second concave areas are respectively smoothly connected to the second polarizing parts; Preferably, the cross-sectional shape of the fourth surface in a direction perpendicular to the flexible display substrate is a second bowl shape; Preferably, the third surface in the first bowl shape and the fourth surface in the second bowl shape are symmetrically distributed relative to the central axis of the first sub-polarizer in the second direction; Preferably, the thickness from the portion of the third surface corresponding to the first bowl-shaped bottom to the portion of the fourth surface corresponding to the second bowl-shaped bottom is 50% to 60% thinner than the thickness of the second polarizing portion.

10. A display device comprising the flexible display panel according to any one of claims 1 to 9.

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