Flexible display panel and display device

Abstract

The present invention provides a flexible display panel and a display device, which include a display area and a wiring area located outside the display area, wherein the wiring area includes a first wiring area formed on a flexible substrate, wherein the first wiring area includes: a first organic layer located on one side of the flexible substrate; a first wiring layer located on the side of the first organic layer away from the flexible substrate; and a second organic layer located on the side of the first wiring layer away from the first organic layer. The present invention improves the wiring area of ​​the display panel by arranging organic layers above and below the wiring layer to replace the inorganic layers above and below the original wiring layer that are easily broken, thereby reducing the failure rate while achieving small R-angle bending; and further patterning the wiring to enhance the anti-bending performance of the wiring, thereby improving the stability and service life of the display panel and the display device.

Description

Technical Field

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

[0002] Folding display screen is an inevitable trend in the development of display technology and has broad market prospects. Flexible AMOLED display screen is the key technology to realize folding display screen. Figure 1 and 2 As shown in FIG, a structural diagram of a flexible display screen in the prior art is shown. The flexible display screen includes a display area 101 and a wiring area outside the display area 101. The wiring area is provided with a wiring layer 102. The wiring layer 102 includes cathode lines 1021 and timing signal lines 1022. The flexible display screen also includes a binding area 103 provided on one side of the display area 101. Figure 1 The figure shows a conventional display screen being bent, where an R angle is formed at the bend. A key challenge in realizing a foldable display screen is how to achieve a small R angle and improve the display screen's bending resistance.

[0003] like Figure 3 As shown, Figure 2 The cross-sectional view along the A1-A1 direction is a cross-sectional view of the routing area. The routing area includes the flexible substrate 104, the first inorganic layer 105, the routing layer 102, and the second inorganic layer 106 in sequence. That is, the cathode line 1021 and the timing signal line 102 are both formed above and below the inorganic layer, and the organic layer 107 and the thin film encapsulation layer 108 are formed above the second inorganic layer 106. When a small R angle is bent, the large-scale inorganic film and the metal routing lines with a large line width perpendicular to the bending direction are prone to obvious cracks after folding. Figure 4 As shown, especially the timing lines and cathode lines, as well as the inorganic layers and other metal layers in the peripheral area, will have obvious cracks when bent, such as along Figure 4 Cracks are likely to form in the direction of the middle arrow, which can also cause the upper and lower film layers (thin film encapsulation layers) to break, resulting in failure of the thin film encapsulation layer, short circuit of the signal line, and other abnormalities.

[0004] Therefore, it is necessary to provide a new flexible display panel that can reduce the failure rate while achieving small R-angle bending.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a flexible display panel and a display device, which can reduce the failure rate and improve the stability and service life of the display panel on the basis of achieving small R-angle bending.

[0007] According to one aspect of the present invention, a flexible display panel is provided, comprising a display area and a wiring area located outside the display area, wherein the wiring area comprises a first wiring area formed on a flexible substrate, the first wiring area comprising:

[0008] a first organic layer, located on one side of the flexible substrate;

[0009] a first wiring layer, located on a side of the first organic layer facing away from the flexible substrate;

[0010] The second organic layer is located on a side of the first wiring layer facing away from the first organic layer.

[0011] Optionally, the first routing layer includes at least one first conductive line.

[0012] Optionally, the first conductive line is a cathode line.

[0013] Optionally, each of the first conductive lines is a patterned conductive line having at least one opening.

[0014] Optionally, the first organic layer and the first conductive line have the same pattern, or both the first organic layer and the second organic layer have the same pattern as the first conductive line.

[0015] Optionally, the first conductive line is a straight line, a wavy line or a broken line;

[0016] The openings formed on the first conductive line are circular openings, square openings, elliptical openings, diamond-shaped openings or fan-shaped openings.

[0017] Optionally, the routing area further includes a second routing area formed on the flexible substrate, and the second routing area includes:

[0018] a first inorganic layer, located on one side of the flexible substrate;

[0019] a second wiring layer, located on a side of the first inorganic layer facing away from the flexible substrate;

[0020] The second inorganic layer is located on a side of the second wiring layer facing away from the first inorganic layer.

[0021] Optionally, the first inorganic layer is made of at least one of silicon nitride material, silicon oxide material and silicon oxynitride material;

[0022] The second inorganic layer is made of at least one of silicon nitride, silicon oxide and silicon oxynitride.

[0023] Optionally, the routing area further includes a second routing area formed on the flexible substrate, and the second routing area includes:

[0024] a third organic layer, located on one side of the flexible substrate;

[0025] a second wiring layer, located on a side of the third organic layer facing away from the flexible substrate;

[0026] The fourth organic layer is located on a side of the second wiring layer away from the third organic layer.

[0027] Optionally, the second routing layer includes at least one second conductive line.

[0028] Optionally, the second conductive line is a timing signal line.

[0029] Optionally, the second conductive line is a patterned conductive line having at least one opening.

[0030] Optionally, when the second wiring layer has a first inorganic layer and a second inorganic layer on both sides respectively, the first inorganic layer and the second conductive line have the same pattern, or the first inorganic layer and the second inorganic layer have the same pattern as the second conductive line;

[0031] When the second wiring layer is flanked by a third organic layer and a fourth organic layer, the third organic layer and the second conductive line have the same pattern, or both the third organic layer and the fourth organic layer have the same pattern as the second conductive line.

[0032] Optionally, the second conductive line is a straight line, a wavy line or a broken line;

[0033] The openings formed on the second conductive line are circular openings, square openings, elliptical openings, diamond-shaped openings or fan-shaped openings.

[0034] Optionally, the first wiring layer is at least one of a metal wiring layer, an ITO conductive layer, a polysilicon conductive layer, an amorphous silicon conductive layer and a single crystal silicon conductive layer.

[0035] Optionally, the first organic layer is made of polyimide material and / or polyethylene terephthalate.

[0036] An embodiment of the present invention further provides a display device, characterized in that it includes the flexible display panel.

[0037] Compared with the prior art, the flexible display panel and display device of the present invention have improved the wiring area outside the display area. By arranging organic layers above and below the wiring layer, respectively, replacing the inorganic layers above and below the original wiring layer that are easily broken, the failure rate is reduced while achieving small R-angle bending. The wiring is further patterned to enhance the bending resistance of the wiring, thereby improving the stability and service life of the display panel and display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0039] Figure 1 A schematic diagram of a flexible display panel being bent in the prior art;

[0040] Figure 2 A top view of a flexible display panel in the prior art;

[0041] Figure 3 for Figure 2 A1-A1 sectional view;

[0042] Figure 4 A schematic diagram of the positions of cathode lines and timing circuits in the prior art;

[0043] Figure 5 is a top view of a flexible display panel according to an embodiment of the present invention;

[0044] Figure 6 for Figure 5 A2-A2 sectional view;

[0045] Figure 7 is a cross-sectional view of a wiring area according to another embodiment of the present invention;

[0046] Figure 8 A cross-sectional view of a wiring area according to another embodiment of the present invention;

[0047] Figures 9-12 Schematic diagram of four different arrangements of the upper and lower film layers of the routing layer of the present invention;

[0048] Figure 13 A schematic diagram of patterning of a routing layer according to an embodiment of the present invention;

[0049] Figures 14-18 Schematic diagrams of five different patternings of the routing layer of the present invention.

[0050] Reference numerals:

[0051] Existing technology:

[0052] 101 display area 104 flexible substrate

[0053] 102 routing layer 105 first inorganic layer

[0054] 1021 cathode line 106 second inorganic layer

[0055] 1022 Timing signal line 107 Organic layer

[0056] 103 bonding area 108 thin film encapsulation layer

[0057] The present invention:

[0058] 1 Display area 4 Flexible substrate

[0059] 2. Routing layer 5. First inorganic layer

[0060] 21 cathode line 6 first organic layer

[0061] 22 Timing signal line 7 Second inorganic layer

[0062] 3 Binding area 8 Second organic layer DETAILED DESCRIPTION

[0063] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated description thereof will be omitted.

[0064] Described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of embodiments of the present invention. However, it will be appreciated by those skilled in the art that, without one or more of the specific details, or by adopting other methods, components, materials etc., technical solutions of the present invention can also be put into practice. In some cases, known structures, materials or operations are not shown or described in detail to avoid blurring the present invention.

[0065] The present invention provides a flexible display panel, including a display area and a wiring area located peripherally of the display area. The wiring area includes a first wiring region formed on a flexible substrate. The first wiring region includes a first organic layer, a first wiring layer, and a second organic layer sequentially disposed on the flexible substrate. Therefore, the present invention provides organic layers above and below the wiring layer, replacing the inorganic layers above and below the original wiring layer, which are prone to fracture. This reduces the failure rate while achieving a small R-angle bending.

[0066] Furthermore, in this embodiment, the first wiring layer can be patterned to divide the original conductive line into multiple conductive lines, and at least one opening can be opened on the conductive line to enhance the bending resistance of the conductive line and improve the stability and service life of the display panel and display device.

[0067] The following describes the implementation of the flexible display panel of the present invention in detail with reference to several embodiments.

[0068] Figure 5 and Figure 6 FIG. 1 shows the structure of the flexible display panel and the wiring area according to an embodiment of the present invention. Figure 5 As shown, the flexible display panel of an embodiment of the present invention includes a display area 1 and a routing area located outside the display area, the routing area includes a routing layer 2, and the routing layer 2 further includes a first routing layer 21 and a second routing layer 22. In this embodiment, the first routing layer 21 includes at least one cathode line, and the second routing layer 22 includes at least one timing signal line. The display panel also includes a binding area 3 located on one side of the display area 1. In this embodiment, the positions of the routing area and the binding area 3 are only examples. In actual applications, there may be other implementations, such as setting the binding area 3 on the left, right or upper side, etc., which all fall within the scope of protection of the present invention.

[0069] like Figure 6 As shown, in this embodiment, the routing area includes a flexible substrate 4, a first organic layer 6 and a first inorganic layer 5 arranged on one side of the flexible substrate 4, a first routing layer 21 arranged on a side of the first organic layer 6 facing away from the flexible substrate 4, a second routing layer 22 arranged on a side of the first inorganic layer 5 facing away from the flexible substrate 4, a second organic layer 8 arranged on a side of the first routing layer 21 facing away from the first organic layer 6, and a second inorganic layer 7 arranged on a side of the second routing layer 22 facing away from the first inorganic layer 5.

[0070] In this embodiment, the first wiring layer 21 includes multiple cathode lines 21. The inorganic layers above and below the cathode lines 21, which are prone to breakage, are removed by etching and replaced with organic layers. Specifically, the second organic layer 8 and the first organic layer 6 are disposed above and below the first wiring layer 21, respectively. This improves the bending resistance of the cathode wiring area, i.e., the first wiring area.

[0071] Furthermore, in this embodiment, the first wiring layer 21 is patterned to divide the cathode line into a plurality of cathode lines, and a plurality of openings may be further provided on the cathode line to enhance the anti-bending capability of the cathode line.

[0072] In this embodiment, since the portion of the display area 1 corresponding to the first inorganic layer 5 also adopts an inorganic layer structure, the inorganic layer structure is still retained below the second wiring layer 22 and can be consistent with the display area 1. In the process, after the first inorganic layer 5 is formed, it is only necessary to etch away the inorganic layer below the first wiring layer 21, without etching the first inorganic layer 5 below the second wiring layer 22. The second inorganic layer 7 above the second wiring layer 22 can also be prepared at the same time as the second inorganic layer of the display area 1. Therefore, this embodiment has little impact on the process on the basis of improving the bending resistance of the cathode line area. Structurally, the entire display panel is divided into the display area 1 and the first part of the second wiring area 22 and the second part of the first wiring area 21 located at the edge of the first part.

[0073] Figure 7 FIG1 shows a cross-sectional view of a wiring area of ​​a flexible display panel according to another embodiment of the present invention. Figure 6 The difference of the embodiment shown in FIG is that the inorganic layer above and below the second wiring layer 22 is further etched away and replaced with an organic layer. With this structure, compared with Figure 6 In the embodiment, the edge region has stronger bending resistance. That is, the first inorganic layer 5 and the second inorganic layer 7 are replaced with a third organic layer and a fourth organic layer, respectively, and the second wiring layer 22 is patterned to divide the timing signal line into multiple conductive lines. In addition, multiple openings can be opened on the timing signal line to enhance the bending resistance of the timing signal line.

[0074] In this embodiment, the third organic layer and the first organic layer 6 are a unified film layer, and the fourth organic layer and the second organic layer 8 are a unified film layer. However, the present invention is not limited to this embodiment, and the third organic layer and the first organic layer 6 are separated, and the fourth organic layer and the second organic layer 8 are separated. It is also possible to realize this and all fall within the scope of protection of the present invention.

[0075] Figure 8 FIG1 shows a cross-sectional view of a wiring area of ​​a flexible display panel according to another embodiment of the present invention. Figure 7 The difference from the embodiment shown in FIG is that the first wiring layer 21 is also patterned. By patterning both the cathode lines and the timing signal lines, and replacing the upper and lower portions of the first wiring layer 21 with organic film layers, and the upper and lower portions of the second wiring layer 22 with organic film layers, this embodiment can significantly improve the bending resistance of the entire wiring area, thereby improving the bending resistance of the display panel, reducing the failure rate, and improving operational stability.

[0076] The arrangement of the wiring area of ​​the flexible display panel of the present invention is not limited to the above three embodiments. Figures 9-12 The present invention also shows four other ways of setting the routing area. Figures 9-12In the embodiment, the wiring layer 2 may include a first wiring layer 21 and a second wiring layer 22, or may include only the first wiring layer 21 or only the second wiring layer 22. That is, the cathode line and the timing signal line may be respectively Figures 9-12 Any of the settings in Figures 9-12 Other configurations not shown.

[0077] like Figure 9 As shown, in this structure, a first organic layer 6 and a second organic layer 8 are respectively provided below and above the wiring layer 2. The wiring layer 2 is divided into multiple conductive lines and patterned, and the first organic layer 6 and the second organic layer 8 both cover the entire surface.

[0078] like Figure 10 As shown, in this structure, a first organic layer 6 and a second organic layer 8 are provided below and above the wiring layer 2, respectively. The wiring layer 2 is divided into multiple conductive lines and patterned. The first organic layer 6 covers the entire surface, while the second organic layer 8 has the same pattern as the wiring layer 2. That is, the second organic layer 8 is also divided into multiple strips corresponding to the wiring layer 21, and each strip can have a corresponding opening.

[0079] like Figure 11 As shown, in this structure, a first organic layer 6 and a second organic layer 8 are respectively provided below and above the wiring layer 2, the wiring layer 2 is divided into multiple conductive lines and patterned, and the first organic layer 6 and the second organic layer 8 have the same pattern as the wiring layer 2.

[0080] like Figure 12 As shown, in this structure, a first inorganic layer 5 is provided below the wiring layer 2, and a second inorganic layer 7 is provided above the wiring layer 2. The wiring layer 2 is divided into multiple conductive lines and patterned. The first inorganic layer 5 and the second inorganic layer 7 have the same pattern as the wiring layer 2, that is, they are divided into multiple lines, and each line can be provided with a corresponding opening.

[0081] The structure of the routing area of ​​the flexible display panel of the present invention is not limited to the above four types, and other methods can also be used. For example, an organic layer is arranged below the routing layer 2 and an inorganic layer is arranged above it, or an inorganic layer is arranged below the routing layer 2 and an organic layer is arranged above it, etc., all of which fall within the scope of protection of the present invention.

[0082] like Figure 13 FIG. 2 shows a structure of a patterned routing layer 2 according to an embodiment of the present invention. The routing layer 2 may be the first routing layer 21 and / or the second routing layer 22, i.e., the cathode lines or the timing signal lines may be patterned, or both of the cathode lines and the timing signal lines may be patterned.

[0083] Figures 14-18The figure shows the patterned structures of the other five wiring layers 2 of the present invention. It can be understood that, Figures 13-18 The patterns shown are only examples and are not limited thereto in actual applications.

[0084] The cathode line can be a straight line, a wavy line, a broken line or one or more combinations thereof. Correspondingly, the timing signal line can also be a straight line, a wavy line, a broken line or one or more combinations thereof.

[0085] The openings on the cathode line can be one or more combinations of circular openings, square openings, elliptical openings, diamond openings, or fan-shaped openings. Correspondingly, the openings on the timing signal line can also be one or more combinations of circular openings, square openings, elliptical openings, diamond openings, or fan-shaped openings. The number of rows of openings can be one or more, and various parameters such as the curvature of the trace, amplitude, and size of the openings can be set as needed.

[0086] like Figure 13 As shown, when the openings on the conductive line are single-row holes, the holes can be circular or elliptical, the line width of the conductive line can be 8 μm, the line spacing of the conductive line is 3 μm, the size of the hole is 3 μm x 3 μm or 3 μm x 5 μm, and the conductive line is divided into as many lines as possible without affecting the resistance value.

[0087] like Figure 14 As shown, when the openings on the conductive line are single-row holes and the holes are rectangular holes, the line width of the conductive line is 16μm, the line spacing is 3μm (the line spacing is measured from the sharp corner of the rhombus), the hole spacing is 5μm, the hole size is 10μm x10μm, and the angle is 45 degrees.

[0088] like Figure 15 As shown, two rows of rectangular holes are opened on the conductive wire, and the size of the conductive wire and the size of the openings can be adaptively adjusted.

[0089] like Figure 16 As shown, double rows of holes are opened on the conductive line, and the holes are fan-shaped, with a fan-shaped angle of 45 degrees and a radius of 5 μm. The line width of the conductive line is 9 μm, the line spacing is 3 μm, the hole spacing is 5 μm, and the hole size is 10 μm x 10 μm.

[0090] like Figure 17 As shown, double rows of holes are opened on the conductive line, and the holes are circular or fan-shaped, the line width of the conductive line is 19 μm, the line spacing is 3 μm, the hole spacing is 3 μm, and the hole size is 3 μm x 3 μm or 3 μm x 5 μm.

[0091] like Figure 18As shown, a double row of holes is opened on the conductive line, and the two rows of holes are fan-shaped holes and rectangular holes respectively. The sizes of the fan-shaped holes and rectangular holes can be adjusted according to the Figure 14 and Figure 16 The line width and line spacing of the conductive line can be adjusted accordingly.

[0092] In this embodiment, the first routing layer is at least one of a metal routing layer, an ITO conductive layer, a polycrystalline silicon conductive layer, an amorphous silicon conductive layer, and a single crystal silicon conductive layer; correspondingly, the second routing layer is at least one of a metal routing layer, an ITO conductive layer, a polycrystalline silicon conductive layer, an amorphous silicon conductive layer, a single crystal silicon conductive layer, and other conductive material film layers. The metal routing layer can be made of one or more conductive metals such as titanium, aluminum, molybdenum, and silver.

[0093] The inorganic film layer used in the present invention can be made of one or more combinations of inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride. That is, the first inorganic layer can be made of at least one of silicon nitride, silicon oxide, silicon oxynitride, or other inorganic materials; and the second inorganic layer can be made of at least one of silicon nitride, silicon oxide, silicon oxynitride, or other inorganic materials.

[0094] The organic film layers used in the present invention can be made of at least one of polyimide, polyethylene terephthalate (PET), or other organic materials, or a combination thereof. Specifically, the first organic layer can be made of at least one of polyimide, polyethylene terephthalate, or other organic materials, or a combination thereof. The second organic layer can be made of at least one of polyimide, polyethylene terephthalate, or other organic materials, or a combination thereof. The third organic layer can be made of at least one of polyimide, polyethylene terephthalate, or other organic materials, or a combination thereof. The fourth organic layer can be made of at least one of polyimide, polyethylene terephthalate, or other organic materials, or a combination thereof.

[0095] The material of the flexible substrate used in the present invention can be polyimide, polyethylene terephthalate or other organic materials or a combination thereof, and its structure can be a single layer or multilayer structure, or a multilayer structure with an inorganic film sandwiched therebetween.

[0096] An embodiment of the present invention further provides a display device, characterized by including the flexible display panel described above. In the wiring area of ​​the display device, the original inorganic film layers above and below the conductive wires are replaced with organic film layers, and the conductive wires can be further segmented and patterned. This can improve the bending resistance of the conductive wires and the bending resistance of the individual film layers in the wiring area, thereby improving the bendability of the display device, making it more suitable for flexible display devices and more in line with technological development trends. The display device of the present invention can be a mobile phone, tablet computer, computer monitor, television, or other device of various sizes and functions.

[0097] To sum up, compared with the prior art, the flexible display panel and display device of the present invention have improved the wiring area outside the display area. By arranging organic layers above and below the wiring layer respectively, replacing the inorganic layers above and below the original wiring layer that are easily broken, the failure rate is reduced while achieving small R-angle bending; and the wiring is further patterned to enhance the bending resistance of the wiring, thereby improving the stability and service life of the display panel and display device.

[0098] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A flexible display panel, characterized in that: The invention comprises a display area and a wiring area located outside the display area, wherein the wiring area comprises a first wiring area and a second wiring area formed on a flexible substrate, wherein the second wiring area is located between the display area and the first wiring area, and the first wiring area comprises: A first organic layer, located on one side of the flexible substrate; A first wiring layer, located on a side of the first organic layer away from the flexible substrate; a second organic layer, located on a side of the first wiring layer away from the first organic layer; The second routing area includes: A first inorganic layer, located on one side of the flexible substrate; A second wiring layer is located on a side of the first inorganic layer away from the flexible substrate; The second inorganic layer is located on a side of the second wiring layer away from the first inorganic layer.

2. The flexible display panel according to claim 1, characterized in that: The first routing layer includes at least one first conductive line.

3. The flexible display panel according to claim 2, wherein: The first conductive line is a cathode line.

4. The flexible display panel according to claim 2, characterized in that: Each of the conductive lines is a patterned conductive line with at least one opening.

5. The flexible display panel according to claim 4, characterized in that: The first organic layer has the same pattern as the first conductive line, or both the first organic layer and the second organic layer have the same pattern as the first conductive line.

6. The flexible display panel according to claim 4, characterized in that: The first conductive line is a straight line, a wavy line or a broken line; The openings formed on the first conductive line are circular openings, square openings, elliptical openings, diamond-shaped openings or fan-shaped openings.

7. The flexible display panel according to claim 1, characterized in that: The first inorganic layer is made of at least one of silicon nitride material, silicon oxide material and silicon oxynitride material; The second inorganic layer is made of at least one of silicon nitride material, silicon oxide material and silicon oxynitride material.

8. The flexible display panel according to claim 1, characterized in that: The second routing layer includes at least one second conductive line.

9. The flexible display panel according to claim 8, characterized in that: The second conductive line is a timing signal line.

10. The flexible display panel according to claim 8, characterized in that: The second conductive line is a patterned conductive line with at least one opening.

11. The flexible display panel according to claim 8, characterized in that: When the second wiring layer has a first inorganic layer and a second inorganic layer on both sides respectively, the first inorganic layer and the second conductive line have the same pattern, or the first inorganic layer and the second inorganic layer and the second conductive line both have the same pattern.

12. The flexible display panel according to claim 8, characterized in that: The second conductive line is a straight line, a wavy line or a broken line; The openings formed on the second conductive line are circular openings, square openings, elliptical openings, diamond-shaped openings or fan-shaped openings.

13. The flexible display panel according to claim 1, characterized in that: The first wiring layer is at least one of a metal wiring layer, an ITO conductive layer, a polysilicon conductive layer, an amorphous silicon conductive layer and a single crystal silicon conductive layer.

14. The flexible display panel according to claim 1, characterized in that: The first organic layer is made of polyimide material and / or polyethylene terephthalate.

15. A display device, characterized in that: A flexible display panel comprising any one of claims 1 to 14.

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