Flexible Display Device

Abstract

The present invention provides a flexible display device, comprising a flexible display panel, a flexible battery, and a heat dissipation assembly, wherein the flexible battery is disposed on a side of the flexible display panel away from the light-emitting surface, and the heat dissipation assembly includes a first heat dissipation sheet disposed on one side of the flexible battery facing the flexible display panel or away from the flexible display panel, and having a foldable region, thereby realizing flexibility of the entire display device, reducing the local temperature of the battery, and preventing the local temperature of the battery from becoming too high, thereby solving the heat dissipation problem of the flexible battery.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority based on Chinese patent applications filed on May 25, 2020, with application number 202010450415.4, and filed on November 13, 2020, with application number 202011267683.9, both entitled "Flexible Display Device," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of display technology, and in particular to flexible display devices. [Background technology]

[0003] The advent of flexible display panels has greatly expanded the design scope of electronic device configurations. Research into thinner and more flexible energy storage devices has provided the potential for matching flexible display panels with flexible energy storage devices. However, there are many limitations to achieving overall display flexibility.

[0004] In addition, energy storage devices generate a certain amount of heat during operation (charging and discharging). If an abnormality occurs at a local location in the energy storage device, there is also the problem of localized overheating "hot spots." This can have a very serious impact on the functionality of flexible batteries and flexible display panels. In severe cases, it can even damage the panel, posing a serious safety risk to users.

[0005] The information disclosed in the above Background Art is intended only to enhance understanding of the background of the present invention, and therefore includes information that does not constitute prior art known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to provide a flexible display device that overcomes one or more problems present in the prior art. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a flexible display device, comprising: A flexible display panel; a flexible battery provided on a side away from the light output surface of the flexible display panel; a heat dissipation assembly including a first heat dissipation sheet; The first heat dissipation sheet is provided on one side of the flexible battery facing the flexible display panel or facing away from the flexible display panel, and has a foldable region.

[0008] In an exemplary embodiment according to the present invention, the bendable region of the first heat dissipation sheet has a through structure formed in the thickness direction.

[0009] In one exemplary embodiment of the present invention, the first heat dissipation sheet is a single sheet-like structure, and the foldable area of ​​the first heat dissipation sheet includes a plurality of patterned openings, which constitute the through structure.

[0010] In one exemplary embodiment of the present invention, the foldable region of the first heat dissipation sheet includes a plurality of heat dissipation bars arranged in parallel, and there is a gap between any two adjacent heat dissipation bars, and the gap constitutes the through structure.

[0011] In one exemplary embodiment of the present invention, the first heat dissipation sheet further includes several connecting members, which connect two adjacent heat dissipation bars, and the connecting members are pivotally connected to the two adjacent heat dissipation bars, so that both of the two adjacent heat dissipation bars can rotate relative to the connecting members.

[0012] In an exemplary embodiment according to the present invention, at least one long side of the heat dissipation bar is provided with at least one first protrusion directed toward the adjacent heat dissipation bar.

[0013] In one exemplary embodiment of the present invention, a second protrusion is provided at a position on the long side of the heat dissipation bar corresponding to the first protrusion of the adjacent heat dissipation bar, and the second protrusion has a notch that matches the shape of the first protrusion, so that the notch and the first protrusion can be fitted together.

[0014] In an exemplary embodiment according to the present invention, the first heat dissipation sheet further includes a heat dissipation pipe connected to each of the heat dissipation bars.

[0015] In one exemplary embodiment of the present invention, the first heat dissipation sheet further includes a substrate layer, the heat dissipation bar is adhered to one side of the substrate layer, and the other side of the substrate layer is adhered to the flexible battery or the flexible display panel.

[0016] In an exemplary embodiment according to the present invention, the width L of the heat dissipation bar satisfies 0.05 mm≦L≦20 mm, and the width h of the gap between two adjacent heat dissipation bars satisfies 0.1 mm≦h≦10 mm.

[0017] In one exemplary embodiment of the present invention, the heat dissipation bar has through holes.

[0018] In an exemplary embodiment according to the present invention, the material of the first heat dissipation sheet is metal.

[0019] In one exemplary embodiment of the present invention, the heat dissipation assembly further includes a second heat dissipation sheet, which is provided on the other side of the flexible battery facing toward or away from the flexible display panel, and has a foldable area, and the foldable area of ​​the second heat dissipation sheet corresponds to the foldable area of ​​the insulating layer and the foldable area of ​​the first heat dissipation sheet.

[0020] In an exemplary embodiment according to the present invention, the structure of the second heat-dissipating sheet and the structure of the first heat-dissipating sheet are the same or different, and the material of the second heat-dissipating sheet and the material of the first heat-dissipating sheet are the same or different.

[0021] In one exemplary embodiment of the present invention, the heat dissipation assembly further includes an insulating layer, the insulating layer being disposed between a heat dissipation sheet adjacent to the flexible display panel and the flexible display panel, the insulating layer having a foldable region, and the foldable region of the insulating layer corresponding to the foldable region of the first heat dissipation sheet.

[0022] In an exemplary embodiment according to the present invention, the material of the heat insulating layer is rubber, silica gel, porous material, polyurethane, acrylic, or an organic film layer including a metal coating layer.

[0023] In an exemplary embodiment of the present invention, the first heat-dissipating sheet, the heat-insulating layer and the second heat-dissipating sheet all have a thickness of 1 mm or less.

[0024] In one exemplary embodiment of the present invention, the heat dissipation assembly further includes a thermally conductive member, the thermally conductive member being disposed between the first heat dissipation sheet and the second heat dissipation sheet and connecting the first heat dissipation sheet and the second heat dissipation sheet, and the thermally conductive member being located on at least one side of the flexible battery and spaced apart from the flexible battery.

[0025] In an exemplary embodiment according to the present invention, the flexible display device further includes a heat dissipation unit, which is connected to at least one of the first heat dissipation sheet, the second heat dissipation sheet, and the thermal conductive member.

[0026] In one exemplary embodiment according to the present invention, the flexible battery includes a flexible housing, and a positive electrode, a negative electrode, an electrolyte, an insulating layer, a positive electrode current collector, and a negative electrode current collector provided within the flexible housing, wherein the positive electrode faces the negative electrode, the insulating layer is located between the positive electrode and the negative electrode, the positive electrode current collector is located on one side of the positive electrode away from the insulating layer, the negative electrode current collector is located on one side of the negative electrode away from the insulating layer, and the electrolyte is distributed between the positive electrode and the negative electrode.

[0027] The flexible display device of the present invention includes a flexible display panel, a flexible battery, and a heat dissipation assembly. The heat dissipation assembly is arranged between the flexible display panel and the flexible battery and has a foldable area, thereby making the entire display device flexible and solving the problem of heat dissipation from the flexible battery, preventing the heat from the battery from affecting the display panel, uniformizing the heat from the battery, and preventing performance degradation due to local overheating of the battery.

[0028] It should be noted that the above general description and the following detailed description are merely exemplary and explanatory and are not intended to limit the present invention.

[0029] The following drawings are incorporated into and constitute a part of the specification, illustrate embodiments pertaining to the present invention, and together with the specification serve to explain the principles of the present invention. The drawings in the following description are merely some embodiments of the present disclosure, and it is clear to those skilled in the art that other drawings can be obtained as well without requiring creative effort. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic diagram showing the structure of a flexible battery according to an embodiment of the present invention. [Figure 2] 1A and 1B are schematic diagrams illustrating a structure of a flexible display panel according to an embodiment of the present invention. [Figure 3] 1A and 1B are schematic diagrams illustrating the structure of a heat dissipation assembly according to a first embodiment. [Figure 4] FIG. 2 is a schematic diagram showing a first structure of patterned openings when the first heat dissipation sheet has a single-sheet structure. [Figure 5] FIG. 10 is a schematic diagram showing a second structure of patterned openings when the first heat dissipation sheet has a single-sheet structure. [Figure 6] FIG. 10 is a schematic diagram showing a third structure of patterned openings when the first heat dissipation sheet has a single-sheet structure. [Figure 7] FIG. 2 is a schematic diagram showing the structure of a first heat-dissipating sheet including a heat-dissipating bar. [Figure 8] FIG. 10 is a schematic diagram showing the adhesive structure of the heat dissipation bar. [Figure 9] 10 is a schematic diagram showing the structure of a heat dissipation bar including a first protrusion. FIG. [Figure 10] 5A to 5C are schematic diagrams showing a plurality of types of shapes of first protrusions. [Figure 11] 3 is a schematic diagram showing the structure of a heat dissipation bar including a first protrusion and a second protrusion. FIG. [Figure 12] FIG. 2 is a schematic diagram showing the structure of a first heat dissipation sheet including a heat dissipation pipe. [Figure 13] 10 is a schematic diagram showing a configuration in which heat dissipation bars are connected by a connecting member. FIG. [Figure 14] FIG. 10 is a schematic diagram showing a configuration in which the heat dissipation bar is connected by another connecting member. [Figure 15] FIG. 10 is a schematic diagram showing a configuration in which through holes are provided in a heat dissipation bar. [Figure 16] 10 is a schematic diagram showing a configuration in which a non-folded region is provided on a first heat dissipation sheet. FIG. [Figure 17] FIG. 10 is a schematic diagram showing the structure of a heat dissipation assembly according to a second embodiment. [Figure 18] FIG. 10 is a schematic diagram showing the structure of a heat dissipation assembly according to a third embodiment. [Figure 19] FIG. 10 is a schematic diagram showing the structure of a heat dissipation assembly according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings indicate the same or similar structures, detailed descriptions thereof will be omitted.

[0032] An embodiment of the present invention provides a flexible display device including a flexible display panel, a flexible battery, and a heat dissipation assembly, wherein the flexible battery is provided on a side of the flexible display panel away from a light-emitting surface thereof, and the heat dissipation assembly includes a first heat dissipation sheet facing either side of the flexible display panel or away from either side of the flexible display panel, the first heat dissipation sheet having a foldable region.

[0033] The display panel, battery, and first heat-dissipating sheet of the present invention all have flexible structures, and each assembly can be bent or folded, achieving overall flexibility. At the same time, since batteries generate a lot of heat during charging and discharging, and the heat generation is uneven, by positioning the first heat-dissipating sheet on either side of the flexible battery, the heat generated by the flexible battery can be absorbed, thereby reducing the temperature of the battery and making the temperature of the battery uniform, thereby avoiding adverse effects on the display panel.

[0034] A flexible display device according to an embodiment will be described below.

[0035] As shown in FIG. 1 , the basic structure of a flexible battery according to an embodiment of the present invention includes a flexible housing 21. The flexible housing 21 contains a positive electrode 22, a negative electrode 23, an electrolyte, a positive electrode current collector 24, a negative electrode current collector 25, and a separator 26. The positive electrode 22 faces the negative electrode 23. The separator 26 is disposed between the positive electrode 22 and the negative electrode 23 and serves to separate the positive electrode 22 from the negative electrode 23 to prevent direct contact between the active materials of the two electrodes, which could cause a short circuit within the battery 2. The positive electrode current collector 24 contacts the positive electrode 22 and is used to transmit current from the positive electrode 22 to an external circuit. The negative electrode current collector 25 contacts the negative electrode 23 and is used to transmit current from the external circuit to the negative electrode 23. The electrolyte is injected between the positive electrode 22 and the negative electrode 23 and serves as a carrier for ion migration. Although the electrolyte has been omitted from the drawing, it will be apparent to those skilled in the art that the electrolyte should be distributed between the positive electrode 22 and the negative electrode 23 to facilitate ion transport.

[0036] Taking the lithium battery 2 as an example, the charging process of the flexible battery 2 is as follows: Lithium ions generated in the positive electrode 22 enter the electrolyte from the positive electrode 22, then enter the electrolyte through the micropores in the separator 26, and finally move to the negative electrode 23 to combine with electrons in the negative electrode 23. The discharging process of the flexible battery 2 is as follows: During discharge, electrons move from the negative electrode 23 to the positive electrode 22 through an external circuit, while lithium ions enter the electrolyte from the negative electrode 23, then enter the electrolyte through the micropores in the separator 26, and finally move to the positive electrode 22 to combine with electrons in the positive electrode 22.

[0037] To achieve flexibility, all of the above components must be flexible. The flexibility of the positive electrode 22 can be achieved by providing patterned openings 10 in the sheet of the solid positive electrode 22, which can be used to buffer strain caused by bending or twisting. The material of the positive electrode 22 varies depending on the type of flexible battery 2. For example, lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, etc. are used in lithium batteries 2. The material of the negative electrode 23 can be graphite powder or graphene, which facilitates flexibility. Flexibility can also be achieved by providing patterned openings 10 in the sheet of the negative electrode 23. The separator 26 can be a polymer film, which can have a single-layer or multi-layer structure. For a single layer, a typical polymer film material such as polyethylene or polypropylene can be used. For a multi-layer, a composite bilayer structure of, for example, polypropylene / polyethylene can be used, or a composite trilayer structure of, for example, polypropylene / polyethylene / polypropylene can be used. All of these materials have flexibility, thereby achieving flexibility. The positive electrode current collector 24 and the negative electrode current collector 25 can be made of a conventional metal current collector material such as copper, aluminum, or stainless steel, or a highly conductive material such as a graphene-based conductive film. A flexible battery 2 incorporating such a film as a current collector can achieve both electrical conductivity and flexibility. A metal current collector (e.g., copper mesh, aluminum mesh, etc.) with patterned openings 10 can also be used. The flexible housing 21 can be made of a material such as an aluminum-plastic film or a copper-plastic film with conventional or patterned openings 10, or it can be a flexible polymer material. Most electrolytes are liquid or gel-like and inherently flexible, but solid electrolytes can also be used.

[0038] Each member inside the flexible battery 2 should correspond to the opening 10 provided to allow bending and folding.

[0039] The basic structure of a flexible display panel according to this embodiment is shown in FIG. 2. The display panel includes a base 11, on which driving transistors and driving circuits (not shown) are provided. To achieve flexibility, the base 11 must be made of a flexible material. The flexible material may be a polymer material such as polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), or polyethylene terenaphthalate (PEN). The flexible base 11 is further provided with a patterned opening 10 structure for relieving stress caused by warping and bending. A pixel defining layer 12 for defining each subpixel opening area is provided on one side of the base 11. A light-emitting element is provided in each opening area. The light-emitting element may be an organic electroluminescent element, specifically including film layers such as an anode layer 13, an organic light-emitting material layer 14, and a cathode layer 15. Of course, the light-emitting element may further include a hole transport layer, an electron transport layer, an electron injection layer, a hole injection layer, and other film layers. This is not particularly limited in the present application. Furthermore, the display panel 1 may further include a sealing layer, which may be a film sealing type to achieve flexibility.

[0040] 3 is a schematic diagram showing a cross-sectional structure of a heat dissipation assembly according to one embodiment. The first heat dissipation sheet 3 is located between the flexible display panel 1 and the flexible battery 2. The first heat dissipation sheet 3 is provided on one side of the battery 2 and absorbs heat emitted from one side of the flexible battery 2 toward the display panel 1, thereby reducing the temperature of the battery 2 and preventing the battery 2 from becoming too hot locally, thereby avoiding any adverse effects on the display panel 1. The first heat dissipation sheet 3 has a foldable region so that it can be warped or folded to fit the entire device.

[0041] The material of the first heat-dissipating sheet 3 may be an organic material with high thermal conductivity, such as graphene. When the first heat-dissipating sheet 3 uses graphene, graphene itself has high flexibility and can be warped or folded. Therefore, the first heat-dissipating sheet 3 may have a single sheet-like structure and can be considered as a foldable region as a whole. Furthermore, a thin graphene heat-dissipating sheet can achieve good thermal conductivity, allowing the thickness of the entire display device to be controlled within an ideal range. The first heat-dissipating sheet 3 made of graphene material can be fixed to the display panel 1 and battery 2 by adhesive.

[0042] The material of the first heat dissipation sheet 3 may be, for example, a metal material such as silver, copper, aluminum, gold, iron, or tin, or an alloy material of the above metals. The above metal materials can provide both heat dissipation and excellent support for the flexible display panel, thereby improving the pressure resistance of the flexible display panel 1. Because metal materials have high rigidity, a through-hole structure must be formed in the bendable region of the material in the thickness direction to achieve ideal bending performance. This relieves stress during bending of the material, improving bending performance. At the same time, it also satisfies the need for a lightweight design. The through-hole structure can have various shapes.

[0043] In some embodiments, the first heat-dissipating sheet 3 has a single sheet-like structure. Patterned openings 10 are provided in the foldable region of the first heat-dissipating sheet 3. That is, by forming openings 10 with a through structure in the first heat-dissipating sheet 3, stresses received when the heat-dissipating sheet 31 is folded can be buffered. It can be understood that the foldable region of the first heat-dissipating sheet 3 should correspond to the foldable region of the flexible display panel 1 or flexible battery 2. The patterned openings 10 may be as shown in FIGS. 4 to 6. In the first structure shown in FIG. 4, the patterned openings 10 are hexagonal and arranged in an array. In the second structure shown in FIG. 5, the patterned openings 10 are circular and arranged in an array. In the third structure shown in FIG. 6, the patterned openings 10 are rectangular and have semicircular edges and are arranged in an array. Of these three structures, the third structure is preferred. This opening shape has a better stress dispersion effect and superior foldability. The first heat dissipation sheet 3, which is made from a single sheet of metal material, is fixed to the display panel 1 and the battery 2 by mechanical connections such as locking or crimping, and can be adhered to the display panel 1 and the battery 2 by methods such as adhesive tape or glue.

[0044] In other embodiments, the first heat-dissipating sheet 3 does not have to be a single sheet. For example, as shown in FIG. 7 , the first heat-dissipating sheet 3 includes multiple heat-dissipating bars 31 arranged in parallel. Furthermore, there is a gap between any two adjacent heat-dissipating bars 31. This gap constitutes a through-hole structure of the first heat-dissipating sheet 3. The gap allows adjacent heat-dissipating bars 31 to be folded toward each other, making the first heat-dissipating sheet 3 foldable as a whole. A first heat-dissipating sheet 3 having such a structure has a better bending effect than a structure in which openings are provided in a single metal sheet. It also reduces the impact of stress on the flexible display module, improving the flexibility and reliability of the display panel. It also reduces the repulsive force of the entire first heat-dissipating sheet 3, reducing the difficulty of assembling the entire flexible display module and achieving flexible operation. In this structure, the heat dissipation bars 31 and their spacing are located at least in the foldable area of ​​the first heat dissipation sheet 3. Of course, the heat dissipation bar 31 structure can also be provided in the non-foldable area to dissipate heat from the flexible battery or support the display panel. It should be understood that folding can be achieved only when the arrangement direction of the heat dissipation bars 31 (i.e., the arrangement direction of the spacing) coincides with the folding direction. Note that the multiple heat dissipation bars described in this invention are arranged in parallel, and allow for angular errors in the actual product due to factors such as process accuracy.

[0045] 8, the heat dissipation bar 31 may be first adhered to the base layer 37 by adhesive bonding, and then the base layer 37 may be adhered to the flexible display panel or flexible battery. Of course, the heat dissipation bar 31 may also be fixed to the flexible battery or flexible display panel by mechanical connection, such as by clasping or crimping. When the heat dissipation bar 31 is adhered to the base layer 37 by adhesive bonding, the heat dissipation bar 31 may be displaced in the folding direction (i.e., width direction) during multiple folding processes, which may reduce the uniformity of heat conduction and supporting capacity of the entire heat dissipation sheet 31.

[0046] In some exemplary embodiments, referring to FIG. 9 , at least one long side of a heat dissipation bar 31 is provided with at least one first protrusion 301 extending toward an adjacent heat dissipation bar 31. When a heat dissipation bar 31 itself or an adjacent heat dissipation bar 31 is displaced, the first protrusion 301 abuts against the adjacent heat dissipation bar 31 to restrict the position of the heat dissipation bar 31. This ensures that a predetermined distance is always maintained between the two, preventing excessive displacement changes from deteriorating the uniformity of heat conduction and supporting capacity. The first protrusion 301 may be provided on only one long side of the heat dissipation bar 31 or on both long sides of the heat dissipation bar 31. The number of first protrusions 301 on each heat dissipation bar 31 may be one or more. The positions of the first protrusions 301 on two adjacent heat dissipation bars 31 may or may not correspond to each other.

[0047] For example, as shown in FIG. 9( a), multiple heat dissipation bars 31 are arranged horizontally at intervals. A right-facing first protrusion 301 is provided on the right side of each heat dissipation bar 31. The first protrusions 301 are located on the same horizontal line. As shown in FIG. 9( b), two right-facing first protrusions 301 are provided on the right side of each heat dissipation bar 31, one above the other. The upper first protrusions 301 are located on the same horizontal line, and the lower first protrusions 301 are located on the same horizontal line. As shown in FIG. 9( c), a left-facing first protrusion 301 is provided on the left side of each heat dissipation bar 31, and a right-facing first protrusion 301 is provided on the right side. Since the first protrusions 301 are located on the same horizontal line, the first protrusions 301 of two adjacent heat dissipation bars 31 are arranged to face each other. Furthermore, as shown in FIG. 9(d), two first protrusions 301 are provided on the left and right sides of each heat dissipation bar 31, one above the other. The upper first protrusions 301 are located on the same horizontal line, and the lower first protrusions 301 are located on the same horizontal line. Furthermore, as shown in FIG. 9(e), a left-facing first protrusion 301 is provided on the left side of each heat dissipation bar 31, and a right-facing first protrusion 301 is provided on the right side thereof. Since the left-facing first protrusions 301 are located on the same horizontal line and the right-facing first protrusions 301 are located on different horizontal lines, the first protrusions 301 of two adjacent heat dissipation bars 31 are arranged to intersect vertically. Furthermore, as shown in FIG. 9(f), two first protrusions 301 are provided on the left and right sides of each heat dissipation bar 31, one above the other. The four first protrusions 301 of each heat dissipation bar 31 are arranged so as to intersect on the left and right sides. Furthermore, as shown in Fig. 9(g), each heat dissipation bar 31 has three first protrusions 301 on the left and right sides, respectively, at the top, middle, and bottom. The first protrusions 301 of each heat dissipation bar 31 are distributed on three horizontal lines. Furthermore, as shown in Fig. 9(h), multiple sets of multiple heat dissipation bars 31 are arranged vertically in the drawing.

[0048] In the above specific embodiment, the case where the shape of each of the first protrusions 301 is semicircular has been described as an example, but it can be understood that the shape of the first protrusions 301 may be any other shape, for example, a rectangle as shown in FIG. 10(a) or a trapezoid as shown in FIG. 10(b).

[0049] Furthermore, in some exemplary embodiments, referring to FIG. 11 , a second protrusion 302 having a notch 3021 is further provided at the long side of the heat dissipation bar 31 corresponding to the first protrusion 301 of the adjacent heat dissipation bar 31. By matching the shape of the notch 3021 to the shape of the first protrusion 301, when the two heat dissipation bars 31 are displaced, the notch 3021 can engage with the first protrusion 301, thereby preventing the heat dissipation bar 31 from moving further. Furthermore, since the notch 3021 can surround the first protrusion 301, it can also prevent the heat dissipation bar 31 from moving in the vertical direction in the drawing. That is, since the position of the heat dissipation bar 31 is restricted in both the horizontal and vertical directions, the position restriction effect is more effective. As shown in FIG. 11( a), the first protrusion 301 and the notch 3021 are both trapezoidal in shape. As shown in FIG. 11(b), the first protrusion 301 and the notch 3021 are both semi-elliptical. The second protrusion 302 may have other shapes, including, but not limited to, the rectangular protrusion shown in the figure. When the heat dissipation bars 31 are close to each other and the first protrusion 301 and the notch 3021 are engaged with each other, a gap still remains between the opposing portions of the two heat dissipation bars 31. A heat dissipation bar 31 may have a plurality of such structures. As shown in FIG. 11(c), each heat dissipation bar 31 has three first protrusions 301 and three second protrusions 302.

[0050] 12, in one exemplary embodiment, the first heat dissipation sheet 3 is further provided with heat dissipation pipes 36. The heat dissipation pipes 36 connect the heat dissipation bars 31 to each other, thereby conducting heat from each heat dissipation bar 31. This improves the uniformity of heat conduction throughout the first heat dissipation sheet 3, and allows for more uniform heat distribution throughout the first heat dissipation sheet 3.

[0051] In another embodiment, adjacent heat dissipation bars 31 may be integrally connected by a connecting member 33. To avoid affecting the bending of adjacent heat dissipation bars 31, the connecting member 33 is preferably pivotally connected to the heat dissipation bars 31. The pivotal structure allows two adjacent heat dissipation bars 31 to be folded relative to each other. Specifically, as shown in FIG. 13 , the connecting member 33 may be a bar-shaped rod attached to the ends of two adjacent heat dissipation bars 31. The extension direction of the bar-shaped rod is perpendicular to the extension direction of the heat dissipation bars 31. Mounting holes (not shown) are provided at opposing positions on both the ends of the heat dissipation bars 31 and the connecting member 33. A horizontally extending shaft 34 passes through the opposing mounting holes in the heat dissipation bars 31 and the connecting member 33, thereby forming the pivotal connection. Both the heat dissipation bars 31 and the connecting member 33 can rotate around the shaft 34, allowing each of the two adjacent heat dissipation bars 31 to rotate relative to the connecting member 33. This allows the two heat dissipation bars 31 to be bent. As shown in FIG. 14 , the connecting member 33 may be a rotation shaft 35 arranged parallel to the heat dissipation bars 31. The rotation shaft 35 is located between two adjacent heat dissipation bars 31. The ends of the heat dissipation bars 31 are provided with an extension section including a mounting hole (mounting holes not shown). Both ends of the rotation shaft 35 are drilled into the mounting holes in the heat dissipation bars 31, allowing the heat dissipation bars 31 to rotate around the rotation shaft 35. Of course, the connecting member 33 may have other structures, such as a connecting wire drilled into the through-holes of each heat dissipation bar 31 to connect the heat dissipation bars 31 in series, but these will not be mentioned here. With this structure, even if the distance between two adjacent heat dissipation bars 31 is small, the first heat dissipation sheet 3 can still be bent using a pivotal structure. Since each heat dissipation bar 31 is integrally connected by the connecting member 33, the structure becomes more robust. At the same time, the material of the connecting member 33 is preferably a material such as a metal having heat conduction properties, so that heat from each heat dissipation bar 31 is conducted to each other via the connecting member 33, thereby making the heat distribution throughout the first heat dissipation sheet 3 more uniform.

[0052] In the above embodiment, referring to FIG. 7, the width and spacing of the heat dissipation bars 31 significantly affect the bending, heat dissipation, and support effects. If the spacing is too large and the width of the heat dissipation bars 31 is too narrow, it will result in poor heat dissipation and poor support. If the spacing is too small and the width of the heat dissipation bars 31 is too wide, it will affect the bending effect. Preferably, the width L of the heat dissipation bars 31 satisfies the range of 0.05 mm≦L≦20 mm. For example, the width L may be 0.05 nm, 0.1 nm, 1 nm, 2 nm, 5 nm, 10 nm, 15 nm, or 20 nm. The smaller the value of the width L, the less likely the heat dissipation bars 31 to form a significant uneven structure in the vertical direction. The width h of the gap between two adjacent heat dissipation bars 31 satisfies the range of 0.1 mm≦h≦10 mm. For example, the width h may be 0.1 nm, 1 nm, 2 nm, 5 nm, 8 nm, or 10 nm. Within this dimension range, the first heat-dissipating sheet 3 can be folded more smoothly, have an ideal heat-dissipating effect, and have a stable structure and a better supporting effect.

[0053] 12 , when the heat dissipation bar 31 includes the first protrusion 301, the width L of the heat dissipation bar 31 is the width of the portion other than the first protrusion 301, i.e., the minimum width of the heat dissipation bar 31. The width h of the gap between two adjacent heat dissipation bars 31 is the distance between the portions of the two heat dissipation bars 31 other than the first protrusion 301, i.e., the maximum gap between two adjacent heat dissipation bars 31. The size of the first protrusion 301 can be set depending on the structure and the gap between the heat dissipation bars 31.

[0054] 15, in one exemplary embodiment, the heat dissipation bar 31 further has through holes 32. The through holes 32 make the heat dissipation bar 31 itself bendable, further improving the bendability of the first heat dissipation sheet 3.

[0055] In the present application, the first heat-dissipating sheet 3 preferably has a thickness of 1 mm or less, whether it has a sheet-like structure or a heat-dissipating bar 31 structure. The thickness of the first heat-dissipating sheet 3 satisfies the heat-dissipating requirements while not significantly increasing the overall thickness of the device, which is advantageous for thin installation.

[0056] 16, the first heat dissipation sheet 3 may include a non-foldable region 30. The non-foldable region 30 may be a single-sheet, non-foldable structural layer. For example, the region of the first heat dissipation sheet 3 corresponding to the non-foldable motherboard IC of the display panel may be provided as a single-sheet metal layer, while the other foldable regions are heat dissipation bar structures.

[0057] The above has described in detail the structure of the first heat-dissipating sheet 3 in the heat-dissipating assembly shown in Fig. 3. In another embodiment, the first heat-dissipating sheet 3 may be located on one side of the flexible battery 2 away from the flexible display panel 1, and may be used to absorb heat emitted from the one side of the flexible battery 2 away from the display panel 1, thereby reducing the temperature of the battery 2 and preventing the local temperature of the battery 2 from becoming too high.

[0058] 17, based on FIG. 3, the heat dissipation assembly further includes a heat insulating layer 4. The first heat dissipation sheet 3 and the heat insulating layer 4 are both located between the flexible display panel 1 and the flexible battery 2. Here, the heat insulating layer 4 is located between the first heat dissipation sheet 3 and the flexible display panel 1. The heat insulating layer 4 is generally sheet-shaped and has a foldable region.

[0059] The function of the heat insulating layer 4 is to insulate the heat between the first heat dissipation sheet 3 and the flexible display panel 1, thereby preventing the flexible display panel 1 from being thermally affected by the high temperature of the first heat dissipation sheet 3. Therefore, the heat insulating layer 4 must be made of a material with low thermal conductivity, such as an organic material such as rubber. At the same time, the heat insulating layer 4 must have a foldable area so that it can be bent or folded to fit the overall structure of the display device. Since the foldable area of ​​the heat insulating layer 4 must correspond to the foldable area of ​​the first heat dissipation sheet 3, the flexible display panel 1, or the flexible battery 2, the heat insulating layer 4 can be provided with a patterned opening 10, and a highly flexible material can be selected. On the other hand, the heat insulating layer 4 can also be made of an insulating material to prevent current leakage from the battery 2 from being transmitted to the display panel 1 through the first heat dissipation sheet 3 and affecting the display panel 1.

[0060] Therefore, taking into consideration the above needs, the material of the heat insulating layer 4 is preferably a porous material such as rubber, silica gel, polyurethane, acrylic, foam material, or fiber material. Air or other media can be filled into the hollow structure of the porous material. The material of the heat insulating layer 4 may also be a heat-reflecting material such as a gold- or silver-plated polyimide film layer.

[0061] The heat-insulating layer 4 and the first heat-dissipating sheet 3 or the display panel 1 may be fixed together by a mechanical connection method or an adhesive method.

[0062] In one embodiment, as shown in FIG. 18 , based on FIG. 3 , the heat dissipation assembly further includes a second heat dissipation sheet 5. Specifically, the first heat dissipation sheet 3 and the heat insulating layer 4 are both provided between the flexible display panel 1 and the flexible battery 2. The heat insulating layer 4 is provided between the first heat dissipation sheet 3 and the flexible display panel 1. The second heat dissipation sheet 5 is located on one side of the flexible battery 2 away from the flexible display panel 1 and covers the one side of the flexible battery 2 in an overall sheet-like shape to absorb heat dissipated from the one side of the flexible battery 2 away from the display panel. This provides the entire device with more optimal heat dissipation performance. The second heat dissipation sheet 5 has a foldable region. It can be understood that the foldable region of the second heat dissipation sheet 5 corresponds to the foldable regions of the first heat dissipation sheet 3, the heat insulating layer 4, the flexible battery 2, and the flexible display panel 1. In another embodiment, when the first heat-dissipating sheet 3 is located on one side of the flexible battery 2 away from the flexible display panel 1, the second heat-dissipating sheet 5 is located on one side of the flexible battery 2 facing the flexible display panel 1, i.e., located between the flexible battery 2 and the flexible display panel 1. In this case, the heat-insulating layer 4 may be provided between the second heat-dissipating sheet 5 and the flexible display panel 1 to prevent the high temperature of the second heat-dissipating sheet 5 from affecting the flexible display panel 1. In other words, the heat-insulating layer 4 may be provided between the heat-dissipating sheet 31, which is always closest to the flexible display panel 1, and the flexible display panel 1.

[0063] The second heat-dissipating sheet 5 and the first heat-dissipating sheet 3 may have the same structure or different structures. The materials of the second heat-dissipating sheet 5 and the first heat-dissipating sheet 3 may be the same or different. For example, the first heat-dissipating sheet 3 may use a metal heat-dissipating bar structure as shown in FIG. 9, and the second heat-dissipating sheet 5 may use a single sheet of graphene film. Alternatively, the first heat-dissipating sheet may use a metal patterned via-hole structure as shown in FIG. 6, and the second heat-dissipating sheet may use a metal heat-dissipating bar structure as shown in FIG. 9. The method of fastening the second heat-dissipating sheet 5 to the flexible battery 2 may refer to the first heat-dissipating sheet 3, and the structure of the foldable region of the second heat-dissipating sheet 5 may also refer to the first heat-dissipating sheet 3, so detailed description will be omitted here. In addition, parameters such as the thickness and dimensions of the second heat-dissipating sheet 5 may be the same as or different from those of the first heat-dissipating sheet 3.

[0064] Referring to FIG. 19 , another structure of the heat dissipation assembly of this embodiment includes a first heat dissipation sheet 3, a heat insulating layer 4, a second heat dissipation sheet 5, and a heat conductive member 6. The first heat dissipation sheet 3 and the heat insulating layer 4 are both provided between the flexible display panel 1 and the flexible battery 2. The heat insulating layer 4 is located between the first heat dissipation sheet 3 and the flexible display panel 1, and the second heat dissipation sheet 5 is located on one side of the flexible battery 2 away from the flexible display panel 1. The heat conductive member 6 is located between the first heat dissipation sheet 3 and the second heat dissipation sheet 5 and connects the first heat dissipation sheet 3 and the second heat dissipation sheet 5. The heat conductive member 6 is located on at least one side of the flexible battery 2 and is spaced apart from the flexible battery 2.

[0065] The thermally conductive member 6 is intended to absorb heat from the first heat-dissipating sheet 3 and the second heat-dissipating sheet 5. Because the thermally conductive member 6 is not in contact with the flexible battery 2, the heat from the first heat-dissipating sheet 3 and the second heat-dissipating sheet 5 is conducted to the thermally conductive member 6, thereby further reducing the heat from the battery 2. The thermally conductive member 6 may be a metal material, or may be an organic material with high thermal conductivity, such as graphene.

[0066] The thermally conductive member 6 may have a columnar or sheet-like structure disposed between the first heat-dissipating sheet 3 and the second heat-dissipating sheet 5, but of course other forms are also possible, and the present application is not particularly limited thereto. It may be disposed on only one side of the battery 2, or on more sides. The thermally conductive member 6 may be integral with the first heat-dissipating sheet 3 or the second heat-dissipating sheet 5. If the first heat-dissipating sheet 3 or the second heat-dissipating sheet 5 includes a heat-dissipating bar 31 and a heat-dissipating pipe 36, the thermally conductive member 6 may be connected to the heat-dissipating pipe 36 to conduct heat to the outside.

[0067] In one exemplary embodiment, referring to FIG. 19 , the display device further includes a heat dissipation unit 7. The heat dissipation unit 7 is connected to at least one of the first heat dissipation sheet, the second heat dissipation sheet, and the thermally conductive member. The heat dissipation unit 7 is configured to absorb heat from the heat dissipation assembly and conduct the heat to the outside of the display device. The heat dissipation unit 7 is provided within the housing of the display device and conducts the absorbed heat to the outside of the housing. The heat dissipation unit 7 may include structures such as cooling fins or a fan. To be connected to the heat dissipation unit 7, at least one of the first heat dissipation sheet 3, the second heat dissipation sheet 5, and the thermally conductive member 6 must extend to the heat dissipation unit 7. Taking the example shown in the drawing, the heat dissipation unit 7 is provided on one side of the flexible battery 2, and the first heat dissipation sheet 3 extends outward along this side relative to the second heat dissipation sheet 5 until it is connected to the heat dissipation unit 7. In the drawing, a left-pointing arrow indicates an omitted extension. In other embodiments, the second heat-dissipating sheet 5 or the heat-conducting member 6 may extend toward the heat-dissipating unit 7, but the present application is not particularly limited thereto.

[0068] 19 further shows a cover plate 8 that covers the light-emitting side of the display panel 1 in the display device and a flexible circuit board 9 that is connected to the display panel 1, but of course the display device may further include other components such as a driving IC and a housing, which will not be listed here. Note that in this embodiment, the dimensions of the flexible battery 2 are larger than the flexible display panel 1, but in other embodiments, the dimensions of the flexible battery 2 may be equal to or smaller than the dimensions of the flexible display panel 1.

[0069] The present invention is not particularly limited in its application to display devices, and may be applied to any product or component having a display function, such as a television, a laptop computer, a tablet, a wearable display device, a mobile phone, an in-vehicle display, a navigation device, an e-book, a digital camera, or an advertising light box.

[0070] In this specification, relative terms such as "above" and "below" are used to describe the relative relationship between one feature and another feature shown in the drawings. However, these terms are merely for convenience of description and are based on, for example, the exemplary orientation shown in the drawings. If the device shown in the drawings is inverted so that its top and bottom are reversed, it can be understood that the feature located "above" becomes the feature located "below." When one structure is located "above" another structure, this can mean that the one structure is integrally formed on the other structure, that the one structure is "directly" disposed on the other structure, or that the one structure is "indirectly" disposed on the other structure by another structure.

[0071] The terms "a," "an," "this," "the," and "at least one" are used to indicate the presence of one or more elements / components / etc. The terms "comprises" and "includes" are used in an open-ended manner and mean the inclusion of further elements / components / etc. other than the listed elements / components / etc.

[0072] Those skilled in the art will readily obtain other embodiments of the present invention through a reading of the specification and practice of the invention disclosed herein. This application includes any modification, use, or adaptation of the present invention, which modification, use, or adaptation follows the general principles of the present invention and includes known knowledge or ordinary technical means in the art that are not disclosed herein. The specification and examples are exemplary only, with the true scope and spirit of the invention being indicated by the following claims. [Explanation of symbols]

[0073] 1 Display panel 2 batteries 3. First heat dissipation sheet 4. Insulation layer 5 Second heat dissipation sheet 6. Heat conduction material 7 Heat dissipation unit 8 cover plate 9 Flexible Circuit Boards 10 aperture 11. Base 12 Pixel Definition Layers 13 Anode layer 14 Organic light-emitting material layer 15 Cathode layer 21 Flexible Housing 22 Positive electrode 23 Negative electrode 24 Positive electrode current collector 25 Negative electrode current collector 26 Separator 31 Heat dissipation bar 32 Through hole 33 Connecting member 34 axes 35 Rotation axis 301 1st protrusion 302 Second protrusion 3021 Notch 36 Heat dissipation tube 37 Base layer 30 non-folded area.

Claims

1. A flexible display device, A flexible display panel; a flexible battery provided on a side of the flexible display panel away from the light-emitting surface; a heat dissipation assembly including a first heat dissipation sheet; the first heat dissipation sheet is provided on one side of the flexible battery facing the flexible display panel or away from the flexible display panel, and has a foldable region; the bendable region of the first heat-dissipating sheet includes a plurality of heat-dissipating bars arranged parallel to each other; There is a gap between any two adjacent heat dissipation bars, The gap constitutes a through structure. Flexible display devices.

2. The foldable region of the first heat dissipation sheet has the through structure in the thickness direction. The flexible display device of claim 1 .

3. the first heat dissipation sheet has a single sheet-like structure, the foldable region of the first heat dissipation sheet includes a plurality of patterned openings; The opening constitutes the through structure. The flexible display device of claim 2 .

4. the first heat dissipation sheet further includes several connecting members; the connecting member connects two adjacent heat dissipation bars; The connecting member is pivotally connected to the two adjacent heat dissipation bars, thereby allowing both of the two adjacent heat dissipation bars to rotate relative to the connecting member. The flexible display device of claim 1 .

5. At least one long side of the heat dissipation bar is provided with at least one first protrusion directed toward the adjacent heat dissipation bar. The flexible display device of claim 1 .

6. a second protrusion is provided at a position on the long side of the heat dissipation bar corresponding to the first protrusion of the adjacent heat dissipation bar; the second protrusion has a notch that matches the shape of the first protrusion, The notch is interfittable with the first protrusion. The flexible display device of claim 5 .

7. The first heat dissipation sheet further includes a heat dissipation pipe connecting each of the heat dissipation bars. The flexible display device of claim 1 .

8. The first heat dissipation sheet further includes a base layer, the heat dissipation bar is adhered to one surface of the base layer; The other surface of the base layer is adhered to the flexible battery or the flexible display panel. The flexible display device of claim 1 .

9. The width (L) of the heat dissipation bar satisfies 0.05 mm≦L≦20 mm, The width (h) of the gap between two adjacent heat dissipation bars satisfies 0.1 mm≦h≦10 mm. The flexible display device of claim 1 .

10. The heat dissipation bar has a through hole. The flexible display device of claim 1 .

11. The material of the first heat dissipation sheet is metal. The flexible display device of claim 2 .

12. the heat dissipation assembly further includes a second heat dissipation sheet; The second heat dissipation sheet is provided on the opposite side of the flexible battery from the first heat dissipation sheet, and has a foldable region. Has, The foldable area of ​​the second heat dissipation sheet corresponds to the foldable area of ​​the heat insulating layer and the foldable area of ​​the first heat dissipation sheet. The flexible display device according to any one of claims 1 to 11.

13. The structure of the second heat dissipation sheet and the structure of the first heat dissipation sheet are the same or different; The material of the second heat dissipation sheet and the material of the first heat dissipation sheet may be the same or different.

13. The flexible display device of claim 12.

14. the heat dissipation assembly further includes a thermal insulation layer; the heat insulating layer is provided between the flexible display panel and the second heat dissipation sheet adjacent to the flexible display panel, and has a bendable region; The foldable region of the heat insulating layer corresponds to the foldable region of the first heat dissipation sheet.

13. The flexible display device of claim 12.

15. The material of the heat insulating layer is an organic film layer including rubber, silica gel, porous material, polyurethane, acrylic or metal coating layer.

13. The flexible display device of claim 12.

16. The thickness of the first heat dissipation sheet, the heat insulating layer, and the second heat dissipation sheet is 1 mm or less.

15. The flexible display device of claim 14.

17. the heat dissipation assembly further includes a thermally conductive member; the thermally conductive member is provided between the first heat dissipation sheet and the second heat dissipation sheet, and connects the first heat dissipation sheet and the second heat dissipation sheet; The heat-conducting member is located on at least one side of the flexible battery, and has a gap between it and the flexible battery.

15. The flexible display device of claim 14.

18. The flexible display device further includes a heat dissipation unit; The heat dissipation unit is connected to at least one of the first heat dissipation sheet, the second heat dissipation sheet, and the heat conduction member.

18. The flexible display device of claim 17.

19. The flexible battery includes a flexible housing, and a positive electrode, a negative electrode, an electrolyte, an insulating layer, a positive electrode current collector, and a negative electrode current collector provided in the flexible housing; The positive electrode is provided opposite the negative electrode, the insulating layer is located between the positive electrode and the negative electrode, the positive electrode current collector is located on one side of the positive electrode away from the insulating layer; the negative electrode current collector is located on one side of the negative electrode away from the insulating layer; The electrolyte is distributed between the positive electrode and the negative electrode. The flexible display device of claim 1 .

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