Back film and display device

Abstract

The present disclosure provides a back film and a display device. The back film is used for a curved display panel, including a central area and a first bendable area and a second bendable area located at two adjacent sides of the central area. A third bendable area is connected between the first bendable area and the second bendable area, and the third bendable area is provided with a plurality of openings. The openings in the third bendable area of ​​the back film can disperse the bending stress there, improve the bending resistance of the back film, and also improve the ductility and adhesion tightness of the back film, thereby extending the service life of the back film.

Description

Technical Field

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

[0002] With the development of the display industry, more and more display devices are using curved display panels to increase the screen-to-body ratio and bring better visual experience to users.

[0003] Usually, a back film is attached to the back of the curved display panel to protect the panel. Ideally, the back film should also have good bendability at the bend of the curved display panel so as to form a tight fit with the display panel. However, the back film is usually a whole piece of organic film, which has poor ductility and poor bending resistance, resulting in stress concentration in the bend area of ​​the curved display panel. In the worst case, wrinkles are formed and the panel cannot be tightly fitted. In the worst case, the back film is damaged, reducing the service life.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to provide a back film and a display device to solve one or more problems existing in the prior art.

[0006] According to one aspect of the present disclosure, there is provided a back film for a curved display panel, the back film comprising:

[0007] a central region, the central region having a first edge and a second edge adjacent to each other, the first edge extending along a first direction, the second edge extending along a second direction, the first direction intersecting the second direction;

[0008] A first bendable area connected to a first edge of the central area and extending along the first direction;

[0009] A second bendable area connected to the second edge of the central area and extending along the second direction;

[0010] A third bendable area connected to a connection between the first edge and the second edge of the central area, and connected to the first bendable area and the second bendable area;

[0011] Wherein, the third bendable area is provided with a plurality of openings.

[0012] In an exemplary embodiment of the present disclosure, the first edge and the second edge are perpendicular, the first bendable area and the second bendable area are both rectangular in shape, the extension length of the first bendable area in the first direction is equal to the length of the first edge of the central area, and the extension length of the second bendable area along the second direction is equal to the length of the second edge of the central area;

[0013] The third bendable area includes a first straight edge connected to the first bendable area, a second straight edge connected to the second bendable area, and an arcuate edge connecting the first straight edge and the second straight edge, the length of the first straight edge is equal to the width of the first bendable area in the second direction, and the length of the second straight edge is equal to the width of the second bendable area in the first direction.

[0014] In an exemplary embodiment of the present disclosure, the first straight side and the second straight side are equal in length, and the third bendable area is in a fan shape.

[0015] In an exemplary embodiment of the present disclosure, the opening of the third bendable zone is circular in shape.

[0016] In an exemplary embodiment of the present disclosure, the diameter of the circular opening is 3-10 μm, and the distance between two adjacent circular openings is 10-15 μm.

[0017] In an exemplary embodiment of the present disclosure, each opening in the third bendable zone is arc-shaped, and an extension direction of the arc-shaped opening is consistent with an extension direction of an arc-shaped edge of the third bendable zone, one end of the arc-shaped opening extends to the first straight edge, and the other end extends to the second straight edge; each of the arc-shaped openings is arranged at intervals along the top angle of the central zone toward the arc-shaped edge.

[0018] In an exemplary embodiment of the present disclosure, each opening in the third bendable zone is in the shape of a strip, and the strip opening extends along the top corner of the central zone toward the arcuate edge, with one end of the strip opening extending to the top corner of the central zone and the other end extending to the arcuate edge; each of the strip openings is arranged at intervals along the direction from the first straight edge to the second straight edge.

[0019] In an exemplary embodiment of the present disclosure, the width of the arc-shaped opening is 80-120 μm, and the distance between two adjacent arc-shaped openings is 150-250 μm.

[0020] In an exemplary embodiment of the present disclosure, in a direction approaching the central area, the spacing between the openings of the third bendable area gradually decreases.

[0021] In an exemplary embodiment of the present disclosure, the shape of the central area is a rectangle, and the number of the third bendable areas is four, which are respectively located at the four vertex corners of the central area.

[0022] In an exemplary embodiment of the present disclosure, the first bendable area and the second bendable area are both provided with a plurality of openings.

[0023] According to another aspect of the present disclosure, there is provided a display device, comprising:

[0024] A curved display panel, the curved display panel comprising a central area, a first curved area and a second curved area respectively located on two adjacent sides of the central area, and a transition area located at a vertex of the central area and connected to the first curved area and the second curved area;

[0025] The back film described above is arranged on the back side of the curved display panel, and the central area of ​​the back film covers the central area of ​​the curved display panel, the first bendable area of ​​the back film covers the first curved area of ​​the curved display panel, the second bendable area of ​​the back film covers the second curved area of ​​the curved display panel, and the third bendable area of ​​the back film covers the transition area of ​​the curved display panel.

[0026] In an exemplary embodiment of the present disclosure, the shape of the central area of ​​the curved display panel is a rectangle, the number of the transition areas is four, and they are respectively located at the four vertex corners of the central area; the shape of the central area of ​​the back film is a rectangle, the number of the third bendable areas is four, and they are respectively located at the four vertex corners of the central area;

[0027] The four third bendable areas of the back film cover the four transition areas of the curved display panel in a one-to-one correspondence.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of a backing film according to an embodiment of the present disclosure;

[0031] Figure 2 is a schematic top view of a rectangular curved display panel according to an embodiment of the present disclosure;

[0032] Figure 3 Shows Figure 2 A schematic cross-sectional view of the middle curved display panel along the AA axis;

[0033] Figure 4 is another schematic top view of a curved display panel according to an embodiment of the present disclosure;

[0034] Figure 5 This is a first schematic diagram of the opening of the third bendable zone in the embodiment of the present disclosure;

[0035] Figure 6 A second schematic diagram of the opening of the third bendable zone of the embodiment of the present disclosure;

[0036] Figure 7 A third schematic diagram of the opening of the third bendable zone according to the embodiment of the present disclosure;

[0037] Figure 8 A fourth schematic diagram of the opening of the third bendable zone according to the embodiment of the present disclosure;

[0038] Fig. 9 is a schematic top view of a hexagonal curved display panel according to an embodiment of the present disclosure;

[0039] Fig.10 It is a structural cross-sectional view of a display device according to an embodiment of the present disclosure.

[0040] In the figure: 10, first bendable area; 20, second bendable area; 30, third bendable area; 31, first straight edge; 32, second straight edge; 33, arcuate edge; 40, central area; 41, first edge; 42, second edge; 90, opening; 100, first curved area; 200, second curved area; 300, transition area; 400, central area. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0042] In an embodiment of the present disclosure, a back film for a curved display panel is provided, such as Figure 1The figure shows a schematic diagram of the structure of the back film of the present embodiment, which includes a central area 40 and a first bendable area 10, a second bendable area 20 and a third bendable area 30 located around the central area 40. The central area 40 has a first edge 41 and a second edge 42 adjacent to each other, the first edge 41 extends along a first direction (horizontal direction), the second edge 42 extends along a second direction (vertical direction), and the first direction intersects with the second direction; the first bendable area 10 is connected to the first edge 41 of the central area and extends along the first direction; the second bendable area 20 is connected to the second edge 42 of the central area and extends along the second direction; the third bendable area 30 is connected to the connection between the first edge 41 and the second edge 42 of the central area, and is connected to the first bendable area 10 and the second bendable area 20; wherein the third bendable area 30 is provided with a plurality of openings 90.

[0043] This back film is suitable for display panels with curved sides. Figure 2 and Figure 3 , Figure 2 shows a schematic top view of a curved display panel, Figure 3 Shows Figure 2 A schematic cross-sectional view of the curved display panel along the AA direction. The curved display panel comprises a central area 400, a first curved area 100 and a second curved area 200 located on two adjacent sides of the central area 400, and a transition area 300 located at the top corner of the central area 400 and connected to the first curved area 100 and the second curved area 200. Since both the first curved area 100 and the second curved area are curved surfaces, the transition area 300 is also curved.

[0044] Figure 3 The upper surface of the middle display panel is the display surface, and the lower surface is the back surface. When attaching the back film of this embodiment, it is attached to the back surface, and the central area 40 of the back film covers the central area 400 of the curved display panel, the first bendable area 10 of the back film covers the first curved area 100 of the curved display panel, the second bendable area 20 of the back film covers the second curved area 200 of the curved display panel, and the third bendable area 30 of the back film covers the transition area 300 of the curved display panel. Since the first curved area 100 and the second curved area 200 are both bending areas, the transition area 300 is also a bending area and bends in two directions at the same time.

[0045] Since the first bendable area 10 and the second bendable area 20 of the back film will bend along the curved surface of the curved display panel, the third bendable area 30 needs to bend inwards in two directions at the same time. The bending stress here is greater and stress concentration is more likely to occur. When the third bendable area 30 is bent, wrinkles are easily generated due to extrusion ( Figure 3The position pointed by the arrow in the middle), resulting in the problem of loose attachment. Moreover, the closer to the central area 40, the more obvious the stress concentration is, which may cause the back film to be damaged. A plurality of openings 90 are provided in the third bendable area. The openings 90 can disperse the bending stress here, improve the bending resistance of the back film, and also improve the ductility and tightness of the back film when attached, thereby avoiding the back film from being damaged here and extending the service life of the back film. In the present disclosure, "plurality" refers to more than one, such as two, three, four or more, and the present disclosure does not specifically limit the specific number referred to by "plurality".

[0046] It should be noted that the above four areas correspond to different parts of the back film, but the entire back film is an integrated structure.

[0047] The curved display panel according to the embodiment of the present disclosure is described in detail below:

[0048] Figure 1 A schematic diagram of the structure of a back film is shown, in which four areas of the back film are separated by dotted lines. The central area 40 is rectangular and located at the center of the back film. The first edge 41 and the second edge 42 can be any two adjacent edges of the central area 40. The upper edge of the central area is taken as the first edge 41, and the right edge is taken as the second edge 42 for example. The first edge 41 and the second edge 42 are perpendicular. The portion located above the first edge 41 is the first bendable area 10, the portion located on the right side of the second edge 42 is the second bendable area 20, and the portion located at the upper right corner of the central area 40 and between the first bendable area 10 and the second bendable area 20 is the third bendable area 30. It can be understood that when the first edge and the second edge are other edges, the first bendable area and the second bendable area can also be the area outside any other two adjacent edges of the central area, and correspondingly, the third bendable area can also be the area at other top corners of the central area.

[0049] In this exemplary embodiment, the first bendable zone 10 and the second bendable zone 20 are both rectangular in shape, the extension length of the first bendable zone 10 in the first direction is equal to the length of the first edge 41 of the central zone, and the extension length of the second bendable zone 20 in the second direction is equal to the length of the second edge 42 of the central zone. The third bendable zone 30 includes a first straight edge 31 connected to the first bendable zone, a second straight edge 32 connected to the second bendable zone, and an arcuate edge 33 connecting the first straight edge and the second straight edge, the length of the first straight edge 31 is equal to the width of the first bendable zone 10 in the second direction, and the length of the second straight edge 32 is equal to the width of the second bendable zone 20 in the first direction. In other words, the outermost edges of the three bendable zones form a smooth connection. Figure 1 As shown, when the sizes of the four regions in all directions match, the entire back film is rectangular in shape, and can be suitable for display panels with curved sides.

[0050] It is understandable that when the third bendable area 30 is only arranged at a vertex of the central area, the back film is only applicable to display panels with only two curved sides. In short, the corresponding back film structure can be arranged according to the specific shape of the applied curved display panel.

[0051] In this exemplary embodiment, Figure 1 As shown, the lengths of the first straight edge 31 and the second straight edge 32 of the third bendable zone 30 are equal, that is, the width of the first bendable zone 10 in the second direction is equal to the width of the second bendable zone 20 in the first direction, then at this time, the shape of the third bendable zone 30 is fan-shaped. The back film of this structure is suitable for most display panels with the same curvature of adjacent side curves. At the same time, since the lengths of the first straight edge 31 and the second straight edge 32 are equal, that is, the width of the first bendable zone 10 in the second direction is equal to the length of the second bendable zone, the opening 90 in the third bendable zone can also maintain uniform stress relief in both directions, thereby alleviating the stress concentration phenomenon to the greatest extent. Of course, in other embodiments, the lengths of the first straight edge 31 and the second straight edge 32 may also be unequal, and the corresponding widths of the first bendable zone 10 and the second bendable zone 20 may also be unequal, such as Figure 4 As shown, the length of the first straight side 31 is smaller than the second straight side 32. The back film of this shape can also disperse the stress at the top corner and has better adhesion and bending resistance.

[0052] In the embodiment of the present disclosure, the shape of the opening 90 of the third bendable area can be any polygon such as circle, ellipse, rectangle, oblong hole, arc, diamond, straight line, curve, broken line, etc.

[0053] In an exemplary embodiment, Figure 5 As shown, the shape of the opening 90 of the third bendable area is circular. The circular opening disperses the stress in all directions evenly and is easy to process. The multiple circular openings can be evenly arranged or unevenly arranged. Since the third bendable area 30 is located between the two bendable areas and bends in two directions at the same time, the size setting of its opening is different from that of the bending area in a single direction.

[0054] In this embodiment, the aperture of the circular opening is preferably 3-10 μm, and the spacing between two adjacent circular openings is preferably 10-15 μm. If the opening is too large and the spacing is too small, it is easy to cause the back film strength to deteriorate. If the opening is too small and the spacing is too large, the stress dispersion will deteriorate and the bending resistance will decrease. The above size range can take into account the strength and bending resistance of the back film. It should be noted that the spacing here can refer to the spacing between two adjacent circular openings in any direction.

[0055] Furthermore, since the stress concentration is more obvious as the third bendable area 30 is closer to the central area 40, the circular openings may be unevenly distributed, such as Figure 5 As shown, the closer to the vertex corner of the central area, the smaller the distance between two adjacent circular openings, which can better relieve internal stress.

[0056] In another exemplary embodiment, Figure 6 As shown, the shape of each opening 90 in the third bendable zone is arc-shaped, and the extension direction of the arc-shaped opening is consistent with the extension direction of the arc-shaped edge 33 of the third bendable zone 30. It should be noted that the description of the shape and extension direction of the arc-shaped opening here is for the overall shape of the opening 90, and it can be understood that the arc-shaped opening also has a certain width. In this embodiment, one end of the arc-shaped opening extends to the first straight side 31, and the other end of the arc-shaped opening extends to the second straight side 32. Extending to the first straight side 31 or the second straight side 32 can specifically overlap with the first straight side 31 or the second straight side 32, or it can also have a certain distance from the first straight side 31 or the second straight side 32. The arc-shaped openings are arranged at intervals along the direction from the top angle of the central area to the arc-shaped edge 33, that is, the arc-shaped openings are arranged one by one from the top angle of the central area to the outside. The openings 90 of this structure can continuously disperse stress in two directions, and have a better stress relief effect.

[0057] In this embodiment, the width of the arc-shaped opening is preferably 80-120 μm, and the spacing between two adjacent arc-shaped openings is preferably 150-250 μm. If the width of the arc-shaped opening is too large and the spacing is too small, it is easy to cause the strength of the back film to deteriorate. If the width is too small and the spacing is too large, the stress dispersion is deteriorated and the bending resistance is reduced. The above size range can take into account both the strength and bending resistance of the back film.

[0058] Furthermore, since the stress concentration is more obvious as the third bendable area 30 is closer to the central area 40, the arc-shaped openings can be distributed at unequal intervals, such as Figure 6 As shown, the closer to the top corner of the central area, the smaller the distance between two adjacent arc-shaped openings, which can better relieve internal stress.

[0059] In some exemplary embodiments, the shape of each opening 90 in the third bendable area can also be a strip, and the strip opening extends along the vertex of the central area 40 in the direction of the arcuate edge 33. It is understandable that the arcuate opening also has a certain width. It should be noted that the description of the shape and extension direction of the strip opening here is for the overall shape of the opening 90, which means that the length of the opening as a whole in the extension direction is greater than the width of the hole. The strip opening can specifically be an opening of various shapes such as a straight line, a curve, a broken line, etc. For example:

[0060] In an exemplary embodiment, Figure 7As shown, the opening is a straight line, one end of the straight line opening extends to the top corner of the central area, and the other end extends to the arcuate edge 33 of the third bendable area; the extension to the top corner or arcuate edge 33 of the central area 40 can specifically overlap with the top corner or arcuate edge 33 of the central area, or can also have a certain distance from the top corner or arcuate edge 33 of the central area. The straight line openings are arranged at intervals along the direction from the first straight edge 31 to the second straight edge 32. The openings 90 of this structure can also continuously disperse stress in two directions, and have a good stress relief effect.

[0061] In this embodiment, the width of the linear opening is preferably 80-120 μm, and the spacing between two adjacent linear openings is preferably 150-250 μm. If the width of the linear opening 90 is too large and the spacing is too small, it is easy to cause the back film strength to deteriorate. If the width is too small and the spacing is too large, the stress dispersion is deteriorated and the bending resistance is reduced. The above size range can take into account both the strength and bending resistance of the back film.

[0062] Furthermore, since the stress concentration is more obvious as the third bendable area 30 is closer to the central area 40, the arc-shaped openings can be distributed at unequal intervals, such as Figure 7 As shown, the closer to the vertex of the central area 40, the smaller the distance between two adjacent strip-shaped openings, that is, the strip-shaped openings are radial, which can better relieve internal stress.

[0063] In another exemplary embodiment, Figure 8 As shown, in this exemplary embodiment, the opening is in the shape of a broken line, and the broken line opening is composed of three straight lines, one end of the broken line opening extends to the top corner of the central area, and the other end extends to the arcuate edge 33 of the third bendable area; the extension to the top corner or arcuate edge 33 of the central area can specifically overlap with the top corner or arcuate edge 33 of the central area, or it can also have a certain distance from the top corner or arcuate edge 33 of the central area. The broken line openings are arranged at intervals along the direction from the first straight edge 31 to the second straight edge 32. The openings 90 of this structure can also continuously disperse stress in two directions, and have a good stress relief effect. In other embodiments, the strip opening can also be a broken line opening composed of other numbers of straight lines, which are not listed here one by one. It should be noted that the angles between the straight holes that make up the broken line opening can be set as needed, and the present disclosure does not specifically limit this.

[0064] In this embodiment, the width of the zigzag opening is preferably 80-120 μm, and the spacing between two adjacent zigzag openings is preferably 150-250 μm. If the width of the strip opening is too large and the spacing is too small, it is easy to cause the back film strength to deteriorate. If the width is too small and the spacing is too large, the stress dispersion is deteriorated and the bending resistance is reduced. The above size range can take into account both the strength and bending resistance of the back film.

[0065] Furthermore, since the stress concentration of the third bendable area 30 is more obvious as it is closer to the central area 40, the arc-shaped openings can be distributed at unequal intervals.

[0066] The above embodiments are all described by taking a rectangular back film suitable for a rectangular curved display panel as an example. In other embodiments, corresponding to curved display panels of other shapes, the back film may not be rectangular, and its first edge 41 and the second edge 42 may not be perpendicular. Accordingly, the two straight edges of the third bendable area 30 are not perpendicular.

[0067] Fig. 9 A back film of a hexagonal curved display panel is shown, and the six sides of the hexagonal curved display panel are all curved surfaces, and the six vertex angles are also curved surfaces. The central area 40 of the back film corresponding to the display panel is hexagonal, and each vertex angle includes a third bendable area 30. It can be seen from this embodiment that the first bendable area 10 and the second bendable area 20 may not be rectangular, and accordingly, the first straight edge 31 and the second straight edge 32 of the third bendable area may not be perpendicular to each other, thereby forming a vertex angle that can cover the curved display panel. Those skilled in the art can understand that the structure and principle of the back film are the same as those in the above embodiment, and will not be repeated here. Furthermore, in the above embodiment, the edges connecting the first straight edge 31 and the second straight edge 32 in the third bendable area are both arc-shaped edges, which better matches the appearance of the transition area 300 of the curved display panel and fits more closely. In other embodiments, the edges can also be straight or broken line-shaped, so that the third bendable area 30 is a right triangle or a rectangle. As long as it can fit the display panel, the specific shape will not be repeated here.

[0068] In the present disclosure, the first bending area and the second bending area of ​​the back film may also be provided with a plurality of openings, so that the first bending area and the second bending area also have a good stress dispersion effect. Specifically, the openings of the first bending area and the second bending area may be in various shapes such as a circle center, a strip, etc. The opening shapes and distributions of the two areas may be the same or different, and of course the shapes of the openings 90 of the two areas and the third bendable area may also be the same or different.

[0069] It should be noted that the opening 90 of the third bendable area of ​​the back film of the present invention can be a through hole that penetrates the entire back film, or a blind hole that does not penetrate the back film. On the other hand, the back film of the present invention can be a single-layer film material or a multi-layer film material, for example, it can include a back film main layer and a protective layer covering one side of the main layer, and can even include a release layer arranged on the other side of the main layer. When the back film needs to be attached, the release layer can be peeled off. Then, when the opening 90 is a through hole, the through hole penetrates all the film layers. When the opening 90 is a blind hole, it can only penetrate part of the film layer or part of the thickness of a film layer.

[0070] The present disclosure also provides a display device, comprising a curved display panel and a back film, Figure 2 and Figure 3 The display panel and back film are shaped as shown, the curved display panel has a central area 400, a first curved area 100 and a second curved area 200 located on both sides of the central area, and a transition area 300 located at the top corner of the central area and connected to the first curved area 100 and the second curved area 200. The back film is attached to the back of the curved display panel, and the central area 40 of the back film covers the central area 400 of the curved display panel, the first bendable area 10 of the back film covers the first curved area 100 of the curved display panel, the second bendable area 20 of the back film covers the second curved area 200 of the curved display panel, and the third bendable area 30 of the back film covers the transition area 300 of the curved display panel. The structural cross-sectional view of the display device in the form of Fig.10 shown. Fig.10 Only the display panel and the back film are shown. Those skilled in the art know that other auxiliary structural layers such as a support layer may generally be provided on the back of the display panel. Under this structure, the back film may also be provided on the back of all the auxiliary structural layers. Its structure, shape, etc. are the same as those in the embodiment shown in the present disclosure and will not be repeated here.

[0071] exist Figure 2 In the exemplary embodiment shown, the shape of the central area 400 of the curved display panel is rectangular, the number of transition areas 300 is four, and they are respectively located at the four corners of the central area 400; the shape of the central area 40 of the back film is rectangular, the number of the third bendable areas 30 is four, and they are respectively located at the four corners of the central area 40; the four third bendable areas 30 of the back film are covered on the four transition areas 300 of the curved display panel in a one-to-one correspondence. Fig. 9 In the illustrated embodiment, the curved display panel may also be hexagonal, and the corresponding back film is also hexagonal. The specific structure is similar to that of a rectangle, and will not be described in detail here.

[0072] The present invention does not impose any specific restrictions on the applicability of display devices, which may be any product or component with a display function, such as a tablet computer, a mobile phone, an e-book, a digital photo frame, etc. These display devices can protect the curved display panel by providing the above-mentioned back film.

[0073] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0074] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0075] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A back film for a curved display panel, characterized in that: The back film comprises: a central region, the central region having a first edge and a second edge adjacent to each other, the first edge extending along a first direction, the second edge extending along a second direction, the first direction intersecting the second direction; A first bendable area connected to a first edge of the central area and extending along the first direction; A second bendable area connected to the second edge of the central area and extending along the second direction; A third bendable area connected to a connection between the first edge and the second edge of the central area, and connected to the first bendable area and the second bendable area; The third bendable area is provided with a plurality of openings; the first edge and the second edge are perpendicular, the first bendable area and the second bendable area are both rectangular in shape, the extension length of the first bendable area in the first direction is equal to the length of the first edge of the central area, and the extension length of the second bendable area along the second direction is equal to the length of the second edge of the central area; The third bendable area includes a first straight edge connected to the first bendable area, a second straight edge connected to the second bendable area, and an arcuate edge connecting the first straight edge and the second straight edge, the length of the first straight edge is equal to the width of the first bendable area in the second direction, the length of the second straight edge is equal to the width of the second bendable area in the first direction; the lengths of the first straight edge and the second straight edge are equal, and the shape of the third bendable area is fan-shaped; the shape of each opening in the third bendable area is arc-shaped, the extension direction of the arcuate opening is consistent with the extension direction of the arcuate edge of the third bendable area, one end of the arcuate opening extends to the first straight edge, and the other end extends to the second straight edge; each of the arcuate openings is arranged at intervals along the vertex angle of the central area toward the arcuate edge.

2. The backing film according to claim 1, characterized in that: The width of the arc-shaped opening is 80-120 μm, and the distance between two adjacent arc-shaped openings is 150-250 μm.

3. The backing film according to claim 1, characterized in that: In a direction approaching the central area, the spacing between the openings in the third bendable area gradually decreases.

4. The backing film according to claim 1, characterized in that: The central area is in a rectangular shape, and the number of the third bendable areas is four and they are respectively located at four vertex corners of the central area.

5. The backing film according to claim 1, characterized in that: The first bendable area and the second bendable area are both provided with a plurality of openings.

6. A display device, characterized in that: include: A curved display panel, the curved display panel comprising a central area, a first curved area and a second curved area respectively located on two adjacent sides of the central area, and a transition area located at a vertex of the central area and connected to the first curved area and the second curved area; The back film as described in any one of claims 1 to 5 is arranged on the back side of the curved display panel, and the central area of ​​the back film covers the central area of ​​the curved display panel, the first bendable area of ​​the back film covers the first curved area of ​​the curved display panel, the second bendable area of ​​the back film covers the second curved area of ​​the curved display panel, and the third bendable area of ​​the back film covers the transition area of ​​the curved display panel.

7. The display device according to claim 6, characterized in that: The shape of the central area of ​​the curved display panel is a rectangle, the number of the transition areas is four, and they are respectively located at the four vertex corners of the central area; the shape of the central area of ​​the back film is a rectangle, the number of the third bendable areas is four, and they are respectively located at the four vertex corners of the central area; The four third bendable areas of the back film cover the four transition areas of the curved display panel in a one-to-one correspondence.

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