Flexible display panel and flexible display device

Abstract

The invention provides a flexible display panel and a flexible display device. The flexible display panel comprises a substrate; the display unit is located on the substrate; the supporting layer is located on the side, away from the display unit, of the substrate; the supporting layer comprises a bending area, a first electrode and a second electrode, the bending area is provided with a plurality of slit structures; the plurality of slit structures are arranged in an array, the row direction is the bending axis direction of the bending area, an offset distance exists between two adjacent rows of slit structures, and the offset distance is smaller than or equal to a preset distance. According to the flexible display panel, the slit structures are arranged in the bending areas of the supporting layer, the rebound force of the bending areas of the supporting layer when the flexible display panel is bent is reduced, the staggered distance of every two adjacent rows of slit structures is limited, the thermal resistance of the bending areas is reduced, the heat transfer performance of the bending areas is improved, and the temperature difference of different areas of the flexible display panel is reduced.

Description

Technical Field

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

[0002] This section is intended to provide a background or context to the embodiments of the disclosure that are recited in the claims. No description herein is admitted to be prior art by inclusion in this section.

[0003] A flexible display device is a bendable or deformable display device having a flexible display panel.

[0004] Since the flexible display panel is relatively soft, a support layer is required on the back side, and a strong metal material can be used as the support layer. When the flexible display panel is bent, the area on the support layer corresponding to the bending area of ​​the flexible display panel may be distorted due to stress, aggravating the crease of the flexible display panel and affecting the life of the flexible display panel. In order to reduce the rebound force of the support layer when the flexible display panel is bent, a slit structure is cut into the support layer using a cutting device.

[0005] However, the slit structure will hinder heat transfer and increase the temperature difference between different areas of the flexible display panel, which will lead to color difference and overall temperature increase. Summary of the invention

[0006] In view of this, an object of the present disclosure is to provide a flexible display panel and a flexible display device, which at least to a certain extent solve one of the technical problems in the related art.

[0007] Based on the above purpose, the first aspect of the exemplary embodiment of the present disclosure provides a flexible display panel, including:

[0008] substrate substrate;

[0009] A display unit is located on the base substrate;

[0010] A supporting layer, located on a side of the base substrate away from the display unit;

[0011] Wherein, the supporting layer comprises:

[0012] Bending zone;

[0013] The bending area is provided with a plurality of slit structures;

[0014] The plurality of slit structures are arranged in an array, wherein the row direction is the bending axis direction of the bending zone, and there is an offset distance between two adjacent rows of the slit structures, wherein the offset distance is less than or equal to a preset distance.

[0015] In some exemplary embodiments, the preset distance includes one quarter of the sum of the length and the spacing of the slit structure in the row direction.

[0016] In some exemplary embodiments, the slit structures are alternately offset left and right in a column direction.

[0017] In some exemplary embodiments, the slit structure is offset along a first direction in a column direction.

[0018] In some exemplary embodiments, the slit structure is shifted by a preset number of steps in the first direction in the column direction, and then shifted by a preset number of steps in the second direction in the column direction;

[0019] The first direction and the second direction are opposite.

[0020] In some exemplary embodiments, when the slit structure is offset in the column direction, the offset distances of different offsets are different.

[0021] In some exemplary embodiments, a depth of the slit structure is smaller than a thickness of the support layer.

[0022] In some exemplary embodiments, a difference between the depth of the slit structure and the thickness of the support layer is less than or equal to 60 μm.

[0023] In some exemplary embodiments, the slit structure is obtained by etching the support layer.

[0024] Based on the same inventive concept, a second aspect of the exemplary embodiments of the present disclosure provides a flexible display device, including the flexible display panel as described in the first aspect.

[0025] From the above, it can be seen that the flexible display panel and flexible display device provided by the embodiments of the present disclosure include: a substrate; a display unit, located on the substrate; a support layer, located on the side of the substrate away from the display unit; wherein the support layer includes: a bending zone; the bending zone is provided with a plurality of slit structures; the plurality of slit structures are arranged in an array, wherein the row direction is the bending axis direction of the bending zone, and there is an offset distance between two adjacent rows of slit structures, wherein the offset distance is less than or equal to a preset distance. The present disclosure reduces the rebound force of the bending zone of the supporting layer when the flexible display panel is bent by providing a slit structure in the bending zone of the supporting layer, and reduces the thermal resistance of the bending zone by limiting the staggered distance between two adjacent rows of slit structures, thereby improving the heat transfer performance of the bending zone and reducing the temperature difference between different areas of the flexible display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a flexible display device in an unfolded state provided by an exemplary embodiment of the present disclosure;

[0028] Figure 2 A schematic structural diagram of a flexible display device in a bent state provided by an exemplary embodiment of the present disclosure;

[0029] Figure 3 A schematic structural diagram of a flexible display panel provided by an exemplary embodiment of the present disclosure;

[0030] Figure 4 A structural schematic diagram of a support layer provided for an exemplary embodiment of the present disclosure;

[0031] Figure 5 A schematic diagram of temperature distribution of a support layer provided for an exemplary embodiment of the present disclosure;

[0032] Figure 6 A schematic diagram of the size of the slit structure provided for an exemplary embodiment of the present disclosure;

[0033] Figure 7 Another schematic diagram of the temperature distribution of the support layer provided for an exemplary embodiment of the present disclosure;

[0034] Figure 8 Another structural schematic diagram of a support layer provided for an exemplary embodiment of the present disclosure;

[0035] Fig. 9 Another structural schematic diagram of a support layer provided for an exemplary embodiment of the present disclosure;

[0036] Fig.10 Another structural schematic diagram of a support layer provided for an exemplary embodiment of the present disclosure;

[0037] Fig.11 Another structural schematic diagram of a support layer provided for an exemplary embodiment of the present disclosure;

[0038] Fig.12 A schematic structural diagram of a slit structure provided for an exemplary embodiment of the present disclosure;

[0039] Fig.13 Another schematic structural diagram of a slit structure provided for an exemplary embodiment of the present disclosure;

[0040] Fig.14 Another schematic structural diagram of a slit structure provided for an exemplary embodiment of the present disclosure;

[0041] Fig.15 Another schematic diagram of temperature distribution of a support layer provided for an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the principles and spirit of the present disclosure will be described with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] It should be understood herein that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction rather than having any limiting meaning.

[0044] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The article "one" or "a" before an element does not exclude the existence of multiple such elements.

[0045] The principle and spirit of the present disclosure are explained in detail below with reference to several representative embodiments of the present disclosure.

[0046] refer to Figure 1 , which is a structural schematic diagram of a flexible display device in an unfolded state provided by an exemplary embodiment of the present disclosure.

[0047] The flexible display device 100 includes a flexible display panel 200 and a driving area 300. The flexible display panel 200 of the flexible display device 100 in the unfolded state is an integral straight plane.

[0048] refer to Figure 2 , which is a structural schematic diagram of a flexible display device in a bent state provided by an exemplary embodiment of the present disclosure.

[0049] Among them, the flexible display device 100 includes a flexible display panel 200 and a driving area 300, the flexible display panel 200 includes a display panel bending area 202, a display panel first straight plate area 204 and a display panel second straight plate area 206, the display panel bending area 202 is located between the display panel first straight plate area 204 and the display panel second straight plate area 206, and connects the display panel first straight plate area 204 and the display panel second straight plate area 206.

[0050] The inventors of the present disclosure discovered that due to the uneven heat generation of the flexible display panel 200, most of the heat is generated by the first straight plate area 204 of the display panel close to the driving area 300. If the heat conduction capacity of the bending area 202 of the display panel is insufficient, it will cause the temperature difference between the first straight plate area 204 of the display panel and the second straight plate area 206 of the display panel to be too large, thereby causing problems such as color difference and overall temperature increase.

[0051] refer to Figure 3 , which is a structural schematic diagram of a flexible display panel provided by an exemplary embodiment of the present disclosure.

[0052] The flexible display panel 200 includes a supporting layer 210 , an adhesive layer 220 , a base substrate (Panel) 230 , a polarizing layer (POL) 240 , and a protective layer 250 , which are overlapped.

[0053] The support layer 210 supports the entire module and may be made of a strong metal material such as stainless steel.

[0054] The inventors of the present disclosure have found that when the flexible display panel 200 is bent, the area on the support layer 210 corresponding to the display panel bending area 202 may be deformed due to stress, aggravating the crease of the flexible display panel 200 and affecting the life of the flexible display panel 200. Therefore, in order to reduce the rebound force of the support layer 210 when the flexible display panel 200 is bent, a slit structure is cut into the support layer 210 using a cutting device, and the slit structures of two adjacent rows are staggered with each other, such as Figure 4 shown.

[0055] refer to Figure 4 , which is a structural schematic diagram of a support layer provided by an exemplary embodiment of the present disclosure.

[0056] The support layer 210 includes a bending area 212 , a first straight area 214 and a second straight area 216 . The bending area 212 is located between the first straight area 214 and the second straight area 216 , and connects the first straight area 214 and the second straight area 216 .

[0057] It should be noted that the reference Figure 3 Since the support layer 210 is one of the layers of the flexible display panel 200, the bending area 212, the first straight area 214 and the second straight area 216 on the support layer 210 and the display panel bending area 202, the display panel first straight area 204 and the display panel second straight area 206 on the flexible display panel 200 are in a one-to-one correspondence. Specifically, their orthographic projections are completely overlapped.

[0058] The bending area 212 is provided with a plurality of slit structures 218;

[0059] The plurality of slit structures 218 are arranged in an array, wherein the row direction is the bending axis direction of the bending region 212 , and two adjacent rows of slit structures 218 are staggered, that is, there is an offset distance between them.

[0060] The inventors of the present disclosure have discovered that the slit structure 218 increases the thermal resistance of the bending region 212 , causing heat to accumulate in the first straight region 214 , thereby increasing the temperature difference between the first straight region 214 and the second straight region 216 in the flexible display panel 200 .

[0061] Specifically, the heat conduction Q of an object per unit time is as follows:

[0062]

[0063] Among them, λ is the thermal conductivity, A is the cross-sectional area perpendicular to the heat flow direction, dt / dx is the temperature gradient, L is the minimum distance of heat flow transmission, dt / dx can also be expressed as the temperature difference Δt between two points divided by the minimum heat transfer distance L between the two points; R is the thermal resistance. From the above formula, the relationship between the thermal resistance R is:

[0064]

[0065] Therefore, when the slit structure 218 is added to the bending zone 212, the cross-sectional area A perpendicular to the heat flow direction will be significantly reduced, and the transmission distance L of the heat flow through the slit structure 218 will be increased, so that the thermal resistance R of the bending zone 212 will increase, thereby causing the temperature difference between the first straight plate area 214 and the second straight plate area 216 in the flexible display panel 200 to increase.

[0066] refer to Figure 5 , as a specific example, the hindering effect of the slit structure 218 on the temperature conduction of the support layer 210 is demonstrated.

[0067] The width of the bending area 212 is 10 mm, and a heat power of 1.5 W is loaded on the first straight plate area 214. The bending area 212 hinders the temperature conduction between the first straight plate area 214 and the second straight plate area 216. The temperature difference between the first straight plate area 214 and the second straight plate area 216 can reach 33°C.

[0068] refer to Figure 6 , which is a schematic diagram of the size of the slit structure.

[0069] Among them, a and e are the long side and the short side of the slit structure 218 respectively, b and f are the distances between the slit structure 218 in the row direction and in the column direction respectively, c and g are the long side array length and the short side array length of the slit structure 218 respectively, the long side array length c of the slit structure 218 is defined as the sum of the long side a of the slit structure 218 and the distance b between the slit structure 218 in the row direction, the short side array length of the slit structure 218 is defined as the sum of the short side e of the slit structure 218 and the distance f between the slit structure 218 in the column direction, and d is the offset distance between two adjacent rows of slit structures 218.

[0070] The distances b and f between the slit structures 218 determine the cross-sectional area A perpendicular to the heat flow direction, and the offset distance d between two adjacent rows of slit structures 218 determines the transmission distance L of the heat flow through the slit structures 218. In conventional design:

[0071]

[0072] The inventors of the present disclosure have discovered that, when other dimensions remain unchanged, reducing the offset distance d between two adjacent rows of slit structures 218 can reduce L, reduce the thermal resistance R of the support layer 210 in the bending area, and improve the heat transfer performance of the support layer 210, thereby reducing the temperature difference between the first straight plate area 214 and the second straight plate area 216.

[0073] In this exemplary embodiment, the preset distance includes one quarter of the sum of the length and the spacing of the slit structure in the row direction.

[0074] In specific implementation, when the offset distance d≤c / 4, the smaller d is, the more helpful it is to the heat conduction capacity of the support layer 210, and the lower the temperature difference at both ends of the bending zone 212; when the offset distance d>c / 4, it has no effect on the heat conduction capacity of the support layer 210.

[0075] refer to Figure 7 As a specific example, the hindering effect of the slit structure 218 on the temperature conduction of the support layer 210 after the offset distance is improved is demonstrated.

[0076] The other slit structures 218 have the same dimensions as Figure 5Under the same conditions, when d is reduced from c / 2 to c / 20, the temperature distribution of the support layer 210 is such that, according to the simulation results, the temperature difference on both sides of the bending area 212 is reduced to 25°C.

[0077] refer to Figure 8 , which is a structural schematic diagram of a support layer provided by an exemplary embodiment of the present disclosure.

[0078] In the present exemplary embodiment, the slit structures 218 are alternately shifted left and right in the column direction.

[0079] As a specific example, after the position of the first row of slit structures 218 is fixed, the second row of slit structures 218 is shifted to the left by d, the third row of slit structures 218 is shifted to the right by d, and so on.

[0080] refer to Fig. 9 , which is a structural schematic diagram of a support layer provided by an exemplary embodiment of the present disclosure.

[0081] In the present exemplary embodiment, the slit structures 218 are offset along a first direction in the column direction.

[0082] As a specific example, after the position of the first row of slit structures 218 is fixed, the second row of slit structures 218 is shifted to the left by d, and the third row of slit structures 218 is shifted to the left by d again, and so on.

[0083] refer to Fig.10 , which is a structural schematic diagram of a support layer provided by an exemplary embodiment of the present disclosure.

[0084] In this exemplary embodiment, after the slit structure 218 is shifted by a preset number of steps in the first direction in the column direction, it is shifted by a preset number of steps in the second direction in the column direction;

[0085] The first direction and the second direction are opposite.

[0086] As a specific example, after the position of the first row of slit structures 218 is fixed, the second row of slit structures 218 is displaced to the right by d, the third row of slit structures 218 is displaced to the right by d again, and so on..., the sixth row of slit structures 218 is displaced to the left by d, the seventh row of slit structures 218 is displaced to the left by d again, and so on..., the tenth row of slit structures 218 is displaced to the right by d, the eleventh row of slit structures 218 is displaced to the right by d again, and so on..., the fifteenth row of slit structures 218 is displaced to the left by d, the sixteenth row of slit structures 218 is displaced to the left by d again, and so on...

[0087] refer to Fig.11 , which is a structural schematic diagram of a support layer provided by an exemplary embodiment of the present disclosure.

[0088] In this exemplary embodiment, when the slit structure 218 is offset in the column direction, the offset distances of different offsets are different.

[0089] As a specific example, after the position of the first row of slit structures 218 is fixed, the second row of slit structures 218 is displaced to the right by d1, the third row of slit structures 218 is displaced to the right by d2, the fourth row of slit structures 218 is displaced to the right by d3, the fifth row of slit structures 218 is displaced to the right by d4, and the sixth row of slit structures 218 is displaced to the right by d5;

[0090] The seventh row of slit structures 218 is displaced to the right by d5, the eighth row of slit structures 218 is displaced to the right by d4, the ninth row of slit structures 218 is displaced to the right by d3, the tenth row of slit structures 218 is displaced to the right by d2, and the eleventh row of slit structures 218 is displaced to the right by d1;

[0091] The twelfth row of slit structures 218 is shifted to the right by d1, the thirteenth row of slit structures 218 is shifted to the right by d2, the fourteenth row of slit structures 218 is shifted to the right by d3, the fifteenth row of slit structures 218 is shifted to the right by d4, the sixteenth row of slit structures 218 is shifted to the right by d5, and so on.

[0092] Among them, d2>d1, d3>d2, d4<d3, d5<d4.

[0093] refer to Fig.12 The manufacturing process of the slit structure 218 of the support layer 210 adopts cutting, and the slit structure 218 is punched into a through hole by a cutting device.

[0094] The inventors of the present disclosure discovered that when the slit structure 218 is punched into a through hole by a cutting device, since the support layer 210 is not retained at the through hole, heat cannot be transmitted through the support layer 210 , thereby reducing the thermal conductivity of the support layer 210 .

[0095] In order to further improve the thermal conductivity of the support layer 210 , in this exemplary embodiment, the slit structure is obtained by etching the support layer, and the depth of the slit structure is less than the thickness of the support layer.

[0096] refer to Fig.13 and Fig.14 In specific implementation, the support layer 210 involved in this exemplary embodiment uses an etching process to etch the slit structure 218 on the support layer 210, the depth n of the slit structure 218 is less than the thickness of the support layer 210, and a portion of the thickness m of the non-slit structure 218 is retained. The thickness area of ​​the non-slit structure 218 is close to the bonding layer of the module to ensure the contact area with the bonding layer and avoid air inside the module.

[0097] A screen with a slit structure 218 is prefabricated, corrosion-resistant ink or a protective coating is printed on the support layer 210 using screen printing technology, and then the support layer 210 is exposed using a UV exposure machine, so that the slit structure 218 can be etched on the support layer 210. During the etching process, the etching depth n is ensured to be less than the thickness of the support layer 210. At the same time, in order to reduce the rebound force and modulus of the support layer 210, the thickness m of the non-slit structure 218 should be as small as possible.

[0098] When a portion of the thickness m of the slit-free structure 218 is retained, heat can be transmitted from the thickness area of ​​the slit-free structure 218, so that only the cross-sectional area A perpendicular to the direction of heat flow is reduced, and the distance L of heat flow transmission will be significantly increased, and the thermal resistance R will be significantly reduced due to the influence of L, thereby improving the thermal conductivity performance of the support layer 210.

[0099] refer to Fig.15 , which is the temperature distribution of the support layer 210 of the half-etched slit structure 218. Fig.12 Under the same conditions, a half-etching process is used, wherein the thickness of the non-slit structure 218 is 30 μm. According to the simulation results, the temperature difference on both sides of the bending area is reduced to 12°C.

[0100] According to the heat dissipation verification, when the thickness m of the slitless structure 218 is ≤60μm, the larger the thickness m of the slitless structure 218 is, the stronger the thermal conductivity of the support layer 210 is, and the smaller the temperature difference between the two ends of the bending zone 212 is; when the thickness m of the slitless structure 218 is greater than 60μm, the thermal conductivity of the support layer 210 will not be significantly enhanced with the increase of the thickness m of the slitless structure 218. At the same time, with the increase of the thickness m of the slitless structure 218, the rebound force and modulus of the support layer 210 will also increase significantly.

[0101] According to the above scheme, when the module architecture remains unchanged and the sizes of other slit structures 218 of the supporting layer 210 remain unchanged, the offset distance d between two adjacent rows is reduced. When d≤c / 4, it is helpful for the heat conduction capacity; the slit structure 218 is manufactured by a semi-etching process, and a portion of the thickness of the slit-free structure 218 is retained. The thickness of the slit-free structure 218 is m≤60μm, which can reduce the thermal conduction resistance of the supporting layer 210, increase the heat transfer performance of the supporting layer 210, and reduce the maximum temperature of the module and the temperature difference in the display area.

[0102] From the above description, it can be seen that the flexible display panel provided by the embodiment of the present disclosure includes: a base substrate; a display unit, located on the base substrate; a support layer, located on the side of the base substrate away from the display unit; wherein the support layer includes: a bending area; the bending area is provided with a plurality of slit structures; the plurality of slit structures are arranged in an array, wherein the row direction is the bending axis direction of the bending area, and there is an offset distance between two adjacent rows of the slit structures, wherein the offset distance is less than or equal to a preset distance.

[0103] The present disclosure reduces the rebound force of the bending zone of the supporting layer when the flexible display panel is bent by providing a slit structure in the bending zone of the supporting layer;

[0104] By limiting the staggered distance between two adjacent rows of slit structures, the thermal resistance of the bending zone is reduced, the heat transfer performance of the bending zone is improved, and the temperature difference between different areas of the flexible display panel is reduced.

[0105] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0106] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0107] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

[0108] Although the spirit and principle of the present disclosure have been described with reference to several specific embodiments, it should be understood that the present disclosure is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined to benefit, and such division is only for the convenience of expression. The present disclosure is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the attached claims. The scope of the attached claims conforms to the broadest interpretation, thereby including all such modifications and equivalent structures and functions.

Claims

1. A flexible display panel, characterized in that: include: substrate substrate; A display unit is located on the base substrate; A supporting layer, located at a side of the base substrate away from the display unit; Wherein, the support layer comprises: Bending zone; The bending area is provided with a plurality of slit structures; The plurality of slit structures are arranged in an array, wherein the row direction is the bending axis direction of the bending zone, and there is an offset distance between two adjacent rows of the slit structures, wherein the offset distance is less than or equal to a preset distance.

2. The flexible display panel according to claim 1, characterized in that: The preset distance includes one quarter of the sum of the length and the spacing of the slit structures in the row direction.

3. The flexible display panel according to claim 1, characterized in that: The slit structures are alternately shifted left and right in the column direction.

4. The flexible display panel according to claim 1, characterized in that: The slit structures are offset along a first direction in a column direction.

5. The flexible display panel according to claim 1, characterized in that: After the slit structure is shifted by a preset number of steps along the first direction in the column direction, it is shifted by a preset number of steps along the second direction in the column direction; The first direction and the second direction are opposite.

6. The flexible display panel according to claim 5, characterized in that: When the slit structure is offset in the column direction, the offset distances of different offsets are different.

7. The flexible display panel according to claim 1, characterized in that: The depth of the slit structure is smaller than the thickness of the supporting layer.

8. The flexible display panel according to claim 7, characterized in that: A difference between the depth of the slit structure and the thickness of the support layer is less than or equal to 60 μm.

9. The flexible display panel according to claim 1, characterized in that: The slit structure is obtained by etching the support layer.

10. A flexible display device, characterized in that: Comprising the flexible display panel as described in any one of claims 1 to 9.

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