A flexible display panel

Abstract

The present application belongs to the field of gas analysis and monitoring, and mainly relates to a flexible display panel, comprising: a supporting layer; a first driving backplane, arranged on the surface of the supporting layer; a display function layer, arranged on the surface of the first driving backplane; a touch layer, arranged on the surface of the display function layer; a polarizer, arranged on the surface of the touch layer; a protective cover, arranged on the surface of the polarizer; and a first optical adhesive, the first optical adhesive being used to bond the supporting layer and the first driving backplane, the first driving backplane and the display function layer, the display function layer and the touch layer, the touch layer and the polarizer, and the polarizer and the protective cover, and the projection area of ​​the first optical adhesive on the protective cover is greater than the projection area of ​​at least one of the two functional structural layers fixed by the first optical adhesive on the protective cover.

Description

Technical Field

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

[0002] The flexible display panel disclosed in the related art includes a support layer, a protective cover plate, and multiple functional structural layers located between the support layer and the protective cover plate. Optical adhesive is provided between each functional structural layer to achieve bonding and fixation. The functional structural layers are arranged flush with each other, meaning that the side surfaces of the functional structural layers together constitute the side surfaces of the flexible display panel. When the side surfaces of the display panel are subjected to external forces or collisions, the different materials of the functional structural layers cause different stresses on each functional structural layer during the collision. As the core components of the entire flexible display panel, the display functional layer and the touch layer are easily broken, which can easily affect the quality of the display panel.

[0003] Therefore, there are defects in the existing technology, which need to be solved urgently. Summary of the Invention

[0004] The present application provides a flexible display panel, which can solve the technical problem that the display panel is easily broken when subjected to external force or bumps.

[0005] To solve the above problems, the technical solutions provided by this application are as follows:

[0006] A flexible display panel, comprising:

[0007] Support layer;

[0008] A first driving back plate is provided on the surface of the supporting layer;

[0009] A display function layer is provided on the surface of the first driving back plate;

[0010] A touch layer, provided on the surface of the display function layer;

[0011] a polarizer, disposed on the surface of the touch layer;

[0012] a protective cover plate, disposed on the surface of the polarizer; and

[0013] A first optical adhesive, wherein the first optical adhesive is used to bond the support layer and the first driving backplane, the first driving backplane and the display function layer, the display function layer and the touch layer, the touch layer and the polarizer, and the polarizer and the protective cover, and the projection area of ​​the first optical adhesive on the protective cover is larger than the projection area of ​​at least one of the two functional structural layers fixed by the first optical adhesive on the protective cover.

[0014] In one embodiment, the first optical adhesive is in an S-shape and extends continuously from the surface of the support layer to the surface of the polarizer.

[0015] In one embodiment, the first optical adhesive includes a planar portion and an edge portion located at the periphery of the planar portion, the planar portion is located between the functional structure layers of the flexible display panel, and the edge portion covers the side surfaces of the functional structure layers.

[0016] In one embodiment, the edge portion has greater water blocking performance than the planar portion.

[0017] In one embodiment, a second optical adhesive is further included, and the second optical adhesive at least covers the side surface of the flexible display panel exposed by the first optical adhesive.

[0018] In one embodiment, adjacent first optical adhesives form a gap on a side of the flexible display panel, and the gap is filled with foam metal.

[0019] In one embodiment, the second optical adhesive covers the surface of the first optical adhesive and the foam metal.

[0020] In one embodiment, the display function layer includes a first flat portion, a second flat portion, and a bent portion connecting the first flat portion and the second flat portion, and the first optical adhesive is further located inside the bent portion; and / or

[0021] Foam metal is filled between the inner side of the bent portion and the side surface of the flexible display panel, and the first optical adhesive can fix the foam metal.

[0022] In one embodiment, the bending portion is provided with a first mark, and the protective cover is provided with a second mark. The components of the first mark and the second mark are both photoluminescent materials. The first mark and the second mark are transparent under normal conditions and will display color under the irradiation of excitation light. The first mark and the second mark are used together to determine the degree of bending of the bending portion.

[0023] In one embodiment, the support layer is carbon fiber cloth, or a composite structure layer formed by hot pressing and cooling carbon fiber cloth and metal mesh.

[0024] The beneficial effects of the present application are as follows: the flexible display panel provided by the present application plays a role in protecting the side of the flexible display panel by bonding the support layer and the first driving backplane, the first driving backplane and the display function layer, the display function layer and the touch layer, the touch layer and the polarizer, and the polarizer and the protective cover plate with the first optical glue, and the projection area of ​​the first optical glue on the protective cover plate is larger than the projection area of ​​at least one of the two functional structural layers fixed by the first optical glue on the protective cover plate, which can prevent the edge from being broken due to collision; it also further prevents the possibility of water and oxygen invading from the side of the flexible display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic cross-sectional structural diagram of the flexible display panel provided in Example 1 of the present application;

[0026] Figure 2 This is another structural diagram of the first optical adhesive included in the flexible display panel provided in Example 2 of the present application;

[0027] Figure 3 This is a schematic diagram of the overall structure of the flexible display panel provided in Example 3 of the present application;

[0028] Figure 4 yes Figure 3 A schematic top view of the internal layer structure of the provided flexible display panel;

[0029] Figure 5 yes Figure 4 A cross-sectional schematic diagram of a provided flexible display panel;

[0030] Figure 6 yes Figure 5 A schematic structural diagram of the support layer of the flexible display panel provided is provided at the folding portion.

[0031] Description of reference numerals:

[0032] 1. Support layer; 2. First driving backplane; 3. Display function layer; 4. Touch layer; 5. Polarizer; 6. Protective cover; 10. Gap; 7. First optical adhesive; 8. Second optical adhesive; 9. Foam metal; 103. Folding part; 30. First flat part; 32. Second flat part; 34. Bending part; 110. First logo; 112. Second logo; 70. Plane part; 72. Edge part; 101. First sub-screen; 102. Second sub-screen; 11. Second driving backplane; 12. Flexible circuit board. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] Example 1

[0035] Please participate Figure 1 The present application provides a flexible display panel that can be used in televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, vehicle-mounted displays, industrial control equipment, medical display screens, touch interactive terminals, and the like, though this application does not specifically limit this. The flexible display panel includes a support layer 1, and a first drive backplane 2, a display function layer 3, a touch layer 4, a polarizer 5, and a protective cover 6, which are sequentially stacked on the surface of the support layer 1.

[0036] In this embodiment, support layer 1 is a composite structure formed by hot-pressing and cooling carbon fiber cloth and metal. The advantage of using a composite structure as support layer 1 is that it enhances the display panel's lightweight and fatigue resistance. Carbon fiber cloth has a very low density and is much lighter than metal materials such as stainless steel. This composite structure helps achieve both lightweight and toughness in the display panel.

[0037] In related art, the support layer 1 is often made of metal materials such as stainless steel (SUS). Metal materials have a relatively high reflectivity. When the display panel is not emitting light, the reflective properties of the metal material are detrimental to the screen's black-out effect, reducing the overall quality of the screen. In this embodiment, since carbon fiber cloth is generally a dark material, it can reduce the reflective properties of the support layer 1, thereby promoting the black-out effect of the screen.

[0038] The first drive backplane 2 includes a substrate and a drive circuit layer. The substrate may be a rigid substrate. Specifically, the rigid substrate may be a glass substrate or a PMMA (polymethyl methacrylate) substrate. Of course, the substrate may also be a flexible substrate. Specifically, the flexible substrate may be a PET (polyethylene terephthalate) substrate, a PEN (polyethylene naphthalate twoformic acid glycol ester) substrate, or a PI (polyimide) substrate.

[0039] The display function layer 3 is preferably an OLED display function layer 3, an LED display function layer 3, a mini-LED display function layer 3, or a Micro-LED display function layer 3. The display function layer 3 is usually a light-emitting layer and an encapsulation layer. They are not shown one by one in this embodiment.

[0040] The polarizer 5 is preferably a polyvinyl alcohol film. The polarizer 5 can reduce the reflection of ambient light by the display device.

[0041] The protective cover plate 6 is a transparent flexible glass layer, which can prevent external water vapor and oxygen from invading the display area and affecting the normal display of pixels in the display area.

[0042] A first optical adhesive 7 is respectively provided between the support layer 1 and the first drive backplane 2, between the first drive backplane 2 and the display function layer 3, between the display function layer 3 and the touch layer 4, between the touch layer 4 and the polarizer 5, and between the polarizer 5 and the protective cover plate 6. The first optical adhesive 7 is used to bond the support layer 1 and the first drive backplane 2, the first drive backplane 2 and the display function layer 3, the display function layer 3 and the touch layer 4, the touch layer 4 and the polarizer 5, and the polarizer 5 and the protective cover plate 6, and the projected area of ​​the first optical adhesive 7 on the protective cover plate 6 is larger than the projected area of ​​at least one of the two functional structural layers fixed by the first optical adhesive 7 on the protective cover plate 6.

[0043] In this embodiment, the first optical adhesive 7 is S-shaped and continuously extends from the surface of the support layer 1 to the surface of the polarizer 5. Therefore, the first optical adhesive 7 can cover part of the side surface of the flexible display panel.

[0044] In order to further improve the water and oxygen barrier capability of the side of the flexible display panel, in this embodiment, the side surface of the flexible display panel exposed by the first optical adhesive 7 is further covered with a second optical adhesive 8. The surface of the second optical adhesive 8 is also covered with a release film.

[0045] In this embodiment, adjacent first optical adhesives 7 form a gap 10 on the side of the flexible display panel. The gap 10 is filled with foam metal 9, and the first optical adhesive 7 can be used to fix the foam metal 9. The foam metal 9 not only serves to dissipate heat, but also provides a buffering effect, reducing stress concentration when touched and preventing damage to the display panel.

[0046] In order to further fix the foam metal 9 and prevent it from falling off, a second optical adhesive 8 is provided, so that the second optical adhesive 8 covers the surface of the first optical adhesive 7 and the foam metal 9. That is, the second optical adhesive 8 and the first optical adhesive 7 or the second optical adhesive 8 and the foam metal 9 are used together to protect the side of the display panel. When the side is covered by the first optical adhesive 7 and the second optical adhesive 8, it is used to block the intrusion of water and oxygen. When the side is covered by the second optical adhesive 8 and the foam metal 9, it is used to dissipate heat and act as a buffer for the side.

[0047] Example 2

[0048] See also Figure 2, the structure of Example 2 is basically the same as that of Example 1, the difference being that the shape of the first optical adhesive 7 used in the flexible display panel is different. In this embodiment, the first optical adhesive 7 is square, and the first optical adhesive 7 includes a plane portion 70 and an edge portion 72 located at the periphery of the plane portion 70. The plane portion 70 is located between the functional structural layers of the flexible display panel, and the edge portion 72 covers the side of the functional structural layer after being folded. The material of the edge portion 72 is different from that of the plane plate, and the water-blocking performance of the edge portion 72 is greater than that of the plane portion 70. In this way, when assembling the flexible display panel, it can still be stacked layer by layer, and each adjacent two functional structural layers are covered by a first optical adhesive 7. There are incisions between the four sides of the edge portion 72, which is convenient and quick when folding down to cover the adjacent functional structural layer.

[0049] Example 3

[0050] See also Figure 3-6 The structure of Example 3 is substantially the same as that of Example 1, except that the flexible display panel is a foldable display panel. For example, it has a cross-fold structure. The flexible display panel includes a first sub-screen 101, a second sub-screen 102, and a folding portion 103 located between the first sub-screen 101 and the second sub-screen 102.

[0051] In this embodiment, the support layer 1 of the folding portion 103 is a composite structure formed by hot-pressing and cooling carbon fiber cloth and a metal steel mesh. The hollowed-out metal steel mesh prevents stress concentration at the folding portion 103 when the flexible display panel is opened and closed, thereby extending the service life of the cross-folding display device.

[0052] Furthermore, to achieve a full-screen display effect, the flexible circuit board is bent to the back of the display area. The second flat portion 32 is supported by the second drive backplane 11. The second flat portion 32 is positioned opposite the first flat portion 30 via the first optical adhesive 7. The surface of the second flat portion 32 can be bonded to the flexible circuit board 12. In this embodiment, the display function layer 3 includes a first flat portion 30, a second flat portion 32, and a bent portion 34 connecting the first and second flat portions 30, 32. The first optical adhesive 7 is also located inside the bent portion 34. The first optical adhesive 7 can reduce the bending stress of the display function layer 3.

[0053] See also Figure 5 In this embodiment, the bending portion 34 is provided with a first mark 110, and the protective cover 6 is provided with a second mark 112. The components of the first mark 110 and the second mark 112 are both photoluminescent materials. The first mark 110 and the second mark 112 are transparent under normal conditions and will display color under the irradiation of excitation light. The first mark 110 and the second mark 112 are used together to judge the degree of bending of the bending portion 34.

[0054] In this embodiment, during assembly, the first mark 110 can display color through the irradiation of excitation light. When the first mark 110 overlaps or intersects with the second mark 112, it can be determined that it is the preset position where the display function layer 3 can be bent, thereby avoiding damage to the display function layer 3 when bending.

[0055] The shapes of the first mark 110 and the second mark 112 are not limited. The shapes of the first mark 110 and the second mark 112 can be the same or different. For example, the first mark 110 can be square and the second mark 112 can be a cross. When the first mark 110 is bent, it gradually moves until the second mark 112 is located at a diagonal position of the first mark 110, and then the bending can be stopped.

[0056] In order to further improve the heat dissipation performance of the flexible display panel, foam metal 9 is filled between the inner side of the bending portion 34 and the side surface of the flexible display panel. Preferably, the foam metal 9 fills the space inside the bending portion 34, and the foam metal 9 can be fixed by the first optical adhesive 7. The foam metal 9 can also limit the bending degree of the display function layer 3 to a certain extent, avoiding excessive bending and damaging the display function layer 3. Since the foam metal 9 is a porous structure of a metal material, it has good thermal conductivity. It can conduct the heat generated by the first driving backplane 2 and the display function layer 3 to the outside, and play a certain role in buffering and absorbing energy. In this way, the outer surface of the bending portion 34 does not need to be covered with a glue layer, which can better achieve heat dissipation and observe the alignment of the first logo 110 and the second logo 112.

[0057] The beneficial effects of the present application are as follows: the flexible display panel provided by the present application, by making the first optical adhesive 7 bond the support layer 1 and the first driving backplane 2, the first driving backplane 2 and the display function layer 3, the display function layer 3 and the touch layer 4, the touch layer 4 and the polarizer 5, and the polarizer 5 and the protective cover plate 6, and the projection area of ​​the first optical adhesive 7 on the protective cover plate 6 is larger than the projection area of ​​at least one of the two functional structural layers fixed by the first optical adhesive 7 on the protective cover plate 6, plays a role in protecting the side of the flexible display panel, and can prevent the possibility of the edge being broken due to collision; it also further prevents the possibility of water and oxygen invading from the side of the flexible display panel.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A flexible display panel, characterized in that: include: Support layer (1); A first driving back plate (2) is arranged on the surface of the supporting layer (1); A display function layer (3) is provided on the surface of the first driving backplane (2); A touch layer (4) is provided on the surface of the display function layer (3); a polarizer (5) disposed on the surface of the touch layer (4); A protective cover plate (6) is arranged on the surface of the polarizer (5); as well as A first optical adhesive (7) is used to bond the support layer (1) to the first driving backplane (2), the first driving backplane (2) to the display function layer (3), the display function layer (3) to the touch layer (4), the touch layer (4) to the polarizer (5), and the polarizer (5) to the protective cover (6). The first optical adhesive (7) is S-shaped and continuously extends from the surface of the support layer (1) to the surface of the polarizer (5). The projection area of ​​the first optical adhesive (7) on the protective cover (6) is larger than the projection area of ​​at least one of the two functional structural layers fixed by the first optical adhesive (7) on the protective cover (6). Adjacent first optical adhesives (7) form a gap (10) on the side of the flexible display panel. The flexible display panel also includes a second optical adhesive (8). The gap (10) is filled with foam metal (9). The second optical adhesive (8) covers the surfaces of the first optical adhesive (7) and the foam metal (9).

2. The flexible display panel according to claim 1, wherein: The display function layer (3) comprises a first flat portion (30), a second flat portion (32), and a bent portion (34) connecting the first flat portion (30) and the second flat portion (32), and the first optical adhesive (7) is further located inside the bent portion (34); and / or A second foam metal is filled between the inner side of the bending portion (34) and the side surface of the flexible display panel, and the first optical adhesive (7) can fix the second foam metal.

3. The flexible display panel according to claim 2, wherein: The bending portion (34) is provided with a first mark (110), and the protective cover (6) is provided with a second mark (112). The components of the first mark (110) and the second mark (112) are both photoluminescent materials. The first mark (110) and the second mark (112) are transparent in a normal state and display color under the irradiation of excitation light. The first mark (110) and the second mark (112) are used in conjunction with each other to judge the bending degree of the bending portion (34).

4. The flexible display panel according to any one of claims 1 to 3, wherein: The support layer (1) is a carbon fiber cloth, or a composite structure layer formed by hot pressing and cooling the carbon fiber cloth and metal mesh.

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