Flexible display device

Abstract

The present invention discloses a flexible display device, comprising a flexible display panel and a support member, wherein the flexible display panel comprises a main display portion, an extension portion, and a bending portion connecting the main display portion and the extension portion, wherein the main display portion, the extension portion, and the support member are stacked, and the support member is located between the main display portion and the extension portion, and in a direction parallel to the extension portion, a preset safety distance is provided between the support member and the bending portion. The present invention supports the main display portion and the extension portion of the flexible display panel through the support member, effectively preventing the bending portion from being squeezed and deformed, so that the bending portion is well supported and protected, and a preset safety distance is provided between the support member and the bending portion, so that when the flexible display panel is folded, the support member is effectively prevented from damaging the bending portion, thereby improving the problem of line breakage.

Description

Technical Field

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

[0002] For a bendable flexible display screen, the edge area of ​​the flexible display screen is generally bent from the display side to the backlight side opposite to the display side, thereby forming a bending portion (also called a pad bending area) in the edge area of ​​the flexible display screen, and a large number of wiring lines are bent in the pad bending area, so the structural parts of the entire machine need to form a gap here to form a support area.

[0003] During use, the flexible display screen will move from unfolding to folding. Due to the different bending radii of each layer, when the flexible display screen is in a folded state, the structural parts of each layer will shift, causing the gap in the pad bending area to become smaller, resulting in the risk of pad bending damage and wire breakage. Summary of the invention

[0004] In view of the above defects or shortcomings in the prior art, it is desirable to provide a flexible display device.

[0005] The present invention provides a flexible display device, comprising a flexible display panel and a support member, wherein the flexible display panel comprises a main display portion, an extension portion, and a bending portion connecting the main display portion and the extension portion, the main display portion, the extension portion, and the support member are stacked, and the support member is located between the main display portion and the extension portion, and in an extension direction parallel to the extension portion, a preset safety distance is spaced between the support member and the bending portion.

[0006] Preferably, the preset safety distance is determined by the following relationship:

[0007] x≥(T 贴合 2 +T oled 2 +T 支撑件 2 ) 1 / 2 +Δ;

[0008] Wherein, x is the preset safety distance; T 贴合 is the fitting tolerance between the flexible display panel and the support member, T oled is the dimensional tolerance of the flexible display panel, T 支撑件 is the dimensional tolerance of the support member; Δ is the displacement of the support member relative to the flexible display panel when the main display portion is folded.

[0009] Preferably, the preset safety distance is 0.2 mm to 1 mm.

[0010] Preferably, the flexible display device further includes:

[0011] A first film material, which is attached to a side of the flexible display panel facing the support member and is broken at the bent portion;

[0012] A second film material, which is attached to a side of the first film material facing the support member and is broken at the bending portion;

[0013] A first connection structure is provided on a side of the support member facing the main display portion; and

[0014] A second connecting structure, which is arranged on a side of the support member facing the extension portion;

[0015] The supporting member is bonded and connected to the second film material through the first connecting structure and the second connecting structure.

[0016] Preferably, in an extension direction parallel to the extension portion, there is a distance between an end of the second connection structure close to the bending portion and an end of the extension portion connected to the bending portion.

[0017] Preferably, the spacing is 0.1 mm to 2 mm.

[0018] Preferably, a curing adhesive is coated on a side of the bending portion facing away from the supporting member.

[0019] Preferably, the curing adhesive exceeds the bending portion and covers a portion of the extension portion.

[0020] Preferably, in an extension direction parallel to the extension portion, the length of the extension portion coated by the curing adhesive is 0.3 mm to 2 mm.

[0021] Preferably, both the first connection structure and the second connection structure are double-sided adhesive tapes;

[0022] The first film material includes any one of the following: double-sided adhesive, polyimide, polyester resin or metal;

[0023] The second film material includes any one of the following: double-sided adhesive, polyimide, polyester resin or metal;

[0024] The material of the support member includes any one of the following: plastic, nylon glass fiber, stainless steel, aluminum alloy, copper alloy, titanium alloy, rubber or foam.

[0025] The flexible display device provided by the embodiment of the present invention supports the main display part and the extension part of the flexible display panel through a support member, effectively preventing the bent part from being squeezed and deformed, so that the bent part is well supported and protected, and a preset safety distance is spaced between the support member and the bent part, which effectively prevents the support member from damaging the bent part when the flexible display panel is bent, and effectively improves the problem of wiring breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 A schematic diagram of the structure of a flexible display device provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0029] Figure 3 Simulation provided for the embodiment of the present invention Figure 2 Simulation diagram of stress concentration at point B in the middle;

[0030] Figure 4 A schematic structural diagram of a flexible display device provided by another embodiment of the present invention;

[0031] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0032] Figure 6 Simulation provided for the embodiment of the present invention Figure 5 Simulation diagram of the stress condition at point B. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a flexible display device, including a flexible display panel 1 and a support member 2, the flexible display panel 1 includes a main display portion 11, an extension portion 13, and a bending portion 12 connecting the main display portion 11 and the extension portion 13, the main display portion 11, the extension portion 13 and the support member 12 are stacked, and the support member 12 is located between the main display portion 11 and the extension portion 13, and in an extension direction parallel to the extension portion 13, the support member 2 and the bending portion 12 are spaced apart by a preset safety distance.

[0036] In this embodiment, the main display portion 11 is used to display images. The main display portion 11 has a front side for presenting images and a back side opposite to the front side. The extension portion 13 is located on the back side of the main display portion 11. Wiring is provided in the bending portion 12 and the extension portion 13. The bending portion 12 in this embodiment is a pad bending area.

[0037] Reference Figure 1 The four directions of up, down, left and right are shown in the figure. Figure 1 The flexible display panel is folded at C, that is, the main display portion 11 is in a folded state; the edge of one end of the flexible display panel 1 is a bent portion 12 .

[0038] In this embodiment, a supporting area is formed between the main display portion 11, the bent portion 12 and the extended portion 13, and the support member 2 forms a support in the supporting area, which can prevent the bent portion 12 from being damaged when the flexible display panel is pressed.

[0039] There is a gap between the support member 2 and the bent portion 12. When the flexible display panel is folded, the support member 2 moves rightward relative to the main display portion 11, which causes the gap to become smaller. In this embodiment, by setting a preset safety distance between the support member 2 and the bent portion 12, a certain gap can be maintained between the support member 2 and the bent portion 12 when the flexible display panel is in a folded state, thereby preventing the bent portion from being damaged, thereby preventing the line from being damaged or disconnected.

[0040] In this embodiment, one end of the support member 2 close to the bending portion 12 is a rounded structure, which further ensures that there is a gap between the support member 2 and the bending portion 12 .

[0041] Furthermore, the preset safety distance is determined by the following relationship:

[0042] x≥(T 贴合 2 +T oled 2 +T 支撑件 2 ) 1 / 2 +Δ;

[0043] Where x is the preset safety distance; T 贴合is the fitting tolerance between the flexible display panel and the support, T oled is the dimensional tolerance of the flexible display panel, T 支撑件 is the dimensional tolerance of the support member; Δ is the displacement of the support member relative to the flexible display panel when the main display portion is folded.

[0044] In this embodiment, the bending portion 12 is preferably roughly semicircular, one end of the support member 2 is rounded, and the preset safety distance x between the top of the support member 2 and the bending portion 12 is preferably 0.2 mm to 1 mm.

[0045] Preferably, x is 0.3 mm. When the main display portion 11 is bent from the unfolded state to the folded state, it is effectively ensured that the support member will not damage the bent portion.

[0046] In this embodiment, the material of the support member 2 includes any of the following: plastic, nylon glass fiber, stainless steel, aluminum alloy, copper alloy, titanium alloy, rubber or foam. In practical applications, the material of the support member 2 can be set according to the rigidity requirements, material process, price and thickness requirements of the whole machine.

[0047] In this embodiment, the flexible display device further includes:

[0048] The first film material 3 is attached to the side of the flexible display panel 1 facing the support member and is broken at the bent portion 12, so that the first film material 3 forms support and protection for the flexible display panel;

[0049] The second film material 4 is attached to the side of the first film material 3 facing the support member and is broken at the bending portion 12. When the flexible display panel changes from a folded state to an unfolded state, the second film material is used to increase the resilience of the flexible display panel;

[0050] A first connection structure 5, which is arranged on a side of the support member 2 facing the main display portion 11;

[0051] A second connecting structure 6, which is arranged on a side of the support member 2 facing the extension portion 13;

[0052] The support member 2 is bonded and connected to the second film material 4 via the first connection structure 5 and the second connection structure 6 .

[0053] In this embodiment, the first film material 3 is preferably connected to the flexible display panel 1 via a first film material adhesive 3 ′, and the second film material 4 is preferably connected to the first film material 3 via a second film material adhesive 4 ′.

[0054] Preferably, the first film material 3 includes any of the following: double-sided adhesive, polyimide, polyester resin or metal film material;

[0055] The second film material 4 includes any of the following: double-sided adhesive, polyimide, polyester resin or metal film material;

[0056] The first connection structure 5 and the second connection structure 6 are both double-sided adhesive tapes;

[0057] The first film adhesive 3 ′ and the second film adhesive 4 ′ are both double-sided adhesives.

[0058] In this embodiment, refer to Figure 1 The upper side of the support member 2 is connected to the second film material 4 by double-sided adhesive, and the support member 2 and the second film material 4 are relatively fixed. The displacement of the support member 2 relative to the flexible display panel 1 is approximately the displacement of the second film material 4 relative to the flexible display panel 1. Therefore, the displacement of the support member 2 relative to the flexible display panel 1 is Δ≈π(1 / 2*t oled +t 第一膜材胶 +t 第一膜材 +t 第二膜材胶 +1 / 2*t 第二膜材 )*K, wherein the thickness of the main display portion is consistent and uniform with the thickness of the extension portion, t oled Indicates the thickness of the flexible display panel (or the main display part, or the extended part), t 第一膜材胶 Indicates the thickness of the first film glue, t 第二膜材胶 Indicates the thickness of the second film glue, t 第一膜材 represents the thickness of the first film material, t 第二膜材 represents the thickness of the second film material, and K is preferably 1 to 2.5.

[0059] In this embodiment, the structure between the main display part of the flexible display panel, the extended part of the flexible display panel and the support member, for example but not limited to the first film material glue, the first film material, the second film material glue, the second film material, the first connecting structure and the second connecting structure, may further include an additional film material layer to protect the main display part and the extended part.

[0060] Further, refer to Figure 3 In the schematic simulation diagram, the point B where the bending portion 12 and the extension portion 13 are connected is the location where the stress is most concentrated. When the main display portion 12 is in a folded state, the bending portion 12 is easily pulled, causing damage to the internal circuit or disconnection.

[0061] As an optional implementation, refer to Figure 4 and Figure 5 ,exist Figure 1 Based on the example flexible display device, in the extension direction parallel to the extension portion 13, there is a horizontal spacing y between one end of the second connecting structure 6 close to the bending portion 12 and one end of the extension portion 13 connected to the bending portion 12, thereby reducing the stress at B of the main display portion 11 when the main display portion 11 is in a folded state.

[0062] Furthermore, the above-mentioned spacing y is 0.1 mm to 1 mm, which can better release the stress at B, thereby avoiding the risk of internal circuit damage or disconnection in the bending portion 12.

[0063] Furthermore, the side of the bending portion 12 facing away from the support member 2 is coated with curing glue 7, which has a certain elasticity and is made of a relatively soft material, thereby further preventing the bending portion 12 from deforming and providing a certain degree of support and protection for the bending portion.

[0064] Furthermore, the curing adhesive 7 exceeds the bending portion 12 and covers a portion of the extension portion 13, so that the stress at B can be further released to avoid line damage or line breakage.

[0065] In the extension direction parallel to the extension part, the length z of the curing glue 7 covering the extension part 13 is 0.3 mm to 2 mm, so that the curing glue has a good protective effect on the bending part and solves the problem of stress concentration at B.

[0066] exist Figure 1 On the basis of the flexible display device of the example, the end of the second connection structure connecting the support member and the extension portion close to the bent portion is spaced apart from the end of the extension portion connected to the bent portion by a distance y, and a curing glue is applied on the side of the bent portion facing away from the support member. In the extension direction parallel to the extension portion, the curing glue covers the length z of the extension portion, so that the stress at B is effectively released. Figure 6 A simulation diagram of the example.

[0067] In the flexible display device provided in this embodiment, the flexible display panel includes a main display part, a bending part and an extension part. The bending part is bent so that the extension part is located on the back of the main display part. A support part domain is formed between the main display part, the extension part and the bending part. The support member is located in the support part domain. The support member and the bending part are spaced apart by a preset safety distance. An end of a second connecting structure connecting the support member and the extension part close to the bending part is spaced apart by a certain distance from an end of the extension part connected to the bending part. A curing glue is coated on the side of the bending part facing away from the supporting member, so that the bending part can be well supported and protected during the folding process of the flexible display device, effectively reducing the stress in the stress concentration part, and effectively avoiding the problem of line damage or line breakage in the bending part.

[0068] The flexible display device provided by the embodiment of the present invention further includes a touch layer 8 and a cover plate 9. The touch layer 8 is attached to the side of the main display part 11 facing away from the support member 2, and the touch layer 8 can be connected to the main display part 11 through optical adhesive. The cover plate 9 is attached to the side of the touch layer 8 facing away from the support member 2, and the cover plate 9 can be connected to the touch layer 8 through optical adhesive. When the cover plate is pressed, it can effectively avoid damage to the bent part, and improve the problem of top damage or wire breakage of the bent part.

[0069] The flexible display device provided in this embodiment further includes a flexible circuit board (FPC) 10 , and the flexible circuit board is connected to the extension portion 13 .

[0070] The directions or positional relationships indicated by “upper”, “lower”, “left”, “right”, “upper side”, etc. in the present invention are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0071] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. A flexible display device, comprising a flexible display panel and a support member, wherein the flexible display panel comprises a main display portion, an extension portion, and a bending portion connecting the main display portion and the extension portion, wherein the main display portion, the extension portion, and the support member are stacked, and the support member is located between the main display portion and the extension portion, characterized in that: In the extension direction parallel to the extension portion, a preset safety distance is spaced between the support member and the bending portion; The preset safety distance is determined by the following relationship: x (T 贴合 2 +T oled 2 + T 支撑件 2 ) 1 / 2 +Δ; Wherein, x is the preset safety distance; T 贴合 is the fitting tolerance between the flexible display panel and the support member, T oled is the dimensional tolerance of the flexible display panel, T 支撑件 is the dimensional tolerance of the support member; Δ is the displacement of the support member relative to the flexible display panel when the main display portion is folded; Dislocation Δ≈π(1 / 2*t oled + t 第一膜材胶 + t 第一膜材 + t 第二膜材胶 + 1 / 2*t 第二膜材 )*K, wherein the thickness of the main display portion is consistent and uniform with the thickness of the extension portion, t oled represents the thickness of the flexible display panel or the main display part or the extended part, t 第一膜材胶 Indicates the thickness of the first film glue, t 第二膜材胶 Indicates the thickness of the second film glue, t 第一膜材 Indicates the thickness of the first film material, t 第二膜材 Indicates the thickness of the second film material.

2. The flexible display device according to claim 1, characterized in that: The preset safety distance is 0.2mm~1mm.

3. The flexible display device according to claim 1, characterized in that: Also includes: A first film material, which is attached to a side of the flexible display panel facing the support member and is broken at the bent portion; A second film material, which is attached to a side of the first film material facing the support member and is broken at the bending portion; A first connection structure is provided on a side of the support member facing the main display portion; and A second connecting structure, which is arranged on a side of the support member facing the extension portion; The supporting member is bonded and connected to the second film material through the first connecting structure and the second connecting structure.

4. The flexible display device according to claim 3, characterized in that: In an extending direction parallel to the extending portion, there is a distance between an end of the second connecting structure close to the bending portion and an end of the extending portion connected to the bending portion.

5. The flexible display device according to claim 4, characterized in that: The spacing is 0.1 mm to 2 mm.

6. The flexible display device according to claim 1, characterized in that: The side of the bending portion facing away from the supporting member is coated with curing glue.

7. The flexible display device according to claim 6, characterized in that: The curing adhesive exceeds the bending portion and covers a portion of the extension portion.

8. The flexible display device according to claim 7, characterized in that: In an extension direction parallel to the extension portion, the curing adhesive coats the extension portion over a length of 0.3 mm to 2 mm.

9. The flexible display device according to claim 3, characterized in that: The first connection structure and the second connection structure are both double-sided adhesive tapes; The first film material includes any one of the following: double-sided adhesive, polyimide, polyester resin or metal film material; The second film material includes any one of the following: double-sided adhesive, polyimide, polyester resin or metal film material; The material of the support member includes any one of the following: plastic, nylon glass fiber, stainless steel, aluminum alloy, copper alloy, titanium alloy, rubber or foam.

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