Display panel

Abstract

The application provides a display panel, which comprises an array substrate, an organic insulating layer, an anode, a pixel definition layer and a light-emitting layer, the organic insulating layer is arranged on the array substrate, the organic insulating layer comprises a plurality of first protruding parts, a groove is arranged between adjacent first protruding parts, the anode is arranged in the groove, the pixel definition layer is arranged on the organic insulating layer, the pixel definition layer comprises a plurality of second protruding parts, the second protruding parts are arranged on the outer layer of the first protruding parts, and the light-emitting layer is arranged on the anode. By forming a plurality of first protruding parts and grooves on the organic insulating layer and forming a plurality of second protruding parts on the pixel definition layer, the second protruding parts are arranged on the outer layer of the first protruding parts, the height of the interval between adjacent grooves can be increased, the ink capacity of the groove can be increased in this way, ink overflow from the groove during inkjet printing can be avoided, and thus the risk of color mixing can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel. BACKGROUND

[0002] Organic light emitting diode (OLED) display technology has many advantages such as self-illumination, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, wide viewing angle, wide temperature range of use, and flexible display and large-area full-color display, and is considered as the most potential display technology. At present, the main methods for preparing organic light emitting diode display panels are evaporation and inkjet printing. The evaporation technology for preparing large, medium and small size organic light emitting diode display panels is relatively mature compared with the inkjet printing technology, and has been used for commercial production. However, the material utilization rate of the evaporation technology is low, and it is difficult to be used for preparing high-resolution display panels. The working principle of the inkjet printing technology is that the ink is sprayed from a small nozzle under the control of a computer program and landed on the designated position of the printing material, and finally a pre-designed pattern is formed. Compared with the evaporation technology, the material utilization rate of the process is higher, and the process cycle time can be reduced by increasing the number of nozzles, which is suitable for preparing large-size organic light emitting diode display panels. At the same time, the inkjet printing process does not need to establish a vacuum chamber, and the manufacturing cost is lower.

[0003] Generally, when an organic light emitting diode display panel is made by using the inkjet printing process, a pixel opening needs to be formed on a pixel definition layer for defining an ink film forming area. During inkjet printing, the pixel opening will be filled with specified ink. If the amount of filled ink is too much, the ink will overflow from the pixel opening and mix with the ink in the adjacent pixel opening, resulting in color deviation and color mixing problems of pixel light emission.

[0004] Therefore, it is necessary to provide a display panel to improve this defect. SUMMARY

[0005] Embodiments of the present application provide a display panel, which can reduce the risk of color mixing.

[0006] In order to achieve the above-mentioned purpose, according to a first aspect of the present application, a display panel is provided, comprising:

[0007] an array substrate;

[0008] an organic insulating layer disposed on the array substrate, the organic insulating layer comprising a plurality of first protruding portions, and a groove being disposed between adjacent first protruding portions;

[0009] an anode disposed in the groove;

[0010] A pixel definition layer is disposed on the organic insulating layer, and comprises a plurality of second protruding portions disposed on the outer layer of the first protruding portions.

[0011] A light-emitting layer is disposed on the anode.

[0012] Optionally, the anode comprises a main body portion and an inclined portion, the inclined portion is connected to the main body portion and is disposed at an angle with the main body portion, the main body portion is disposed on the bottom of the groove, and the inclined portion is disposed on the sidewall of the first protruding portion.

[0013] Optionally, the second protruding portion is disposed on the first protruding portion and part of the anode, and the inclined portion of the anode is disposed between the sidewall of the first protruding portion and the sidewall of the second protruding portion.

[0014] Optionally, a plurality of the anodes are arranged in rows along a first direction, and a plurality of the anodes are arranged in columns along a second direction, and the first direction is different from the second direction.

[0015] The first protruding portion is disposed on both sides of each column of the anodes along the second direction.

[0016] Optionally, along the film thickness direction of the organic insulating layer, the height of the inclined portion is less than the height of the first protruding portion.

[0017] Optionally, the second protruding portion comprises a first sub-protruding portion, the first sub-protruding portion is disposed on both sides of each column of the anodes along the second direction.

[0018] The first sub-protruding portion is disposed on the outer layer of the first protruding portion, and the inclined portion is disposed between the sidewall of the first protruding portion and the sidewall of the first sub-protruding portion.

[0019] Optionally, the second protruding portion comprises a plurality of second sub-protruding portions, the second sub-protruding portions are disposed between any two adjacent rows of the anodes along the first direction.

[0020] The second sub-protruding portion is disposed on the outer layer of the first protruding portion, the inclined portion is disposed between the sidewall of the first protruding portion and the sidewall of the second sub-protruding portion, and part of the first sub-protruding portion is disposed on the outer layer of the second sub-protruding portion.

[0021] Optionally, the pixel definition layer further comprises a plurality of spacing portions, the spacing portions are disposed in the groove, and the spacing portions are continuously disposed with the second sub-protruding portions.

[0022] The interval part is arranged between any two adjacent rows of the anodes, and covers one end of the two adjacent rows of the anodes close to each other along a film thickness direction of the pixel definition layer.

[0023] Optionally, the organic insulating layer comprises:

[0024] The first organic insulating layer is arranged on the array substrate.

[0025] The second organic insulating layer is arranged on the first organic insulating layer.

[0026] The second organic insulating layer comprises the first protruding part and the groove, and a depth of the groove is the same as a thickness of the second organic insulating layer along a film thickness direction of the second organic insulating layer.

[0027] Optionally, the organic insulating layer comprises:

[0028] The first organic insulating layer is arranged on the array substrate.

[0029] The second organic insulating layer is arranged on the first organic insulating layer.

[0030] The second organic insulating layer comprises a flat part, the first protruding part and the groove, the flat part is arranged on the first organic insulating layer, the first protruding part is arranged on the flat part, and a depth of the groove is less than a thickness of the second organic insulating layer along a film thickness direction of the second organic insulating layer.

[0031] In the display panel of the embodiment of the present application, the first protruding part and the groove are formed in the organic insulating layer, and the second protruding part is arranged outside the first protruding part, so that the height of the interval between the adjacent grooves is increased, the amount of ink accommodated by the groove is increased, and the risk of color mixing is reduced.

[0032] Other features and advantages of the present application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0034] For a more complete understanding of the present application and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals indicate like parts:

[0035] Figure 1 A schematic diagram of a film layer structure of a display panel provided for an embodiment of the present application is shown in the following figure:

[0036] Figure 2 A partial top view of a display panel provided for an embodiment of the present application is shown in the following figure:

[0037] Figure 3 A cross-sectional view of a display panel provided for an embodiment of the present application along the direction of A-A' is shown in the following figure:

[0038] Figure 4 A cross-sectional view of a display panel provided for an embodiment of the present application along the direction of B-B' is shown in the following figure:

[0039] Figure 5 A cross-sectional view of a display panel provided for an embodiment of the present application along the direction of C-C' is shown in the following figure:

[0040] Figure 6 A cross-sectional view of a display panel provided for an embodiment of the present application along the direction of D-D' is shown in the following figure:

[0041] Figure 7 A schematic diagram of an organic insulating layer in a display panel provided for an embodiment of the present application is shown in the following figure:

[0042] Figure 8 A schematic diagram of an organic insulating layer in another display panel provided for an embodiment of the present application is shown in the following figure:

[0043] Figure 9 A schematic diagram of a display device provided for an embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0045] An embodiment of the present application provides a display panel, the display panel comprising an array substrate, an organic insulating layer, an anode, a pixel definition layer and a light-emitting layer, the organic insulating layer being arranged on the array substrate, the organic insulating layer comprising a plurality of first protruding portions, a groove being arranged between adjacent first protruding portions, the anode being arranged in the groove, the pixel definition layer being arranged on the organic insulating layer, the pixel definition layer comprising a plurality of second protruding portions, the second protruding portions being arranged outside the first protruding portions, and the light-emitting layer being arranged on the anode.

[0046] In the embodiments of this application, by forming a plurality of first protrusions and grooves in the organic insulating layer and forming a plurality of second protrusions in the pixel definition layer, and by setting the second protrusions on the outer layer of the first protrusions, the height of the spacing between adjacent grooves can be increased, thereby increasing the amount of ink that the grooves can hold, preventing ink from overflowing from the grooves during inkjet printing, and thus reducing the risk of color mixing.

[0047] Please see Figure 1 , Figure 1 This is a schematic diagram of the film structure of a display panel provided in an embodiment of this application. The display panel includes an array substrate 1, an organic insulating layer 2, an anode 3, a pixel definition layer 4, and a light-emitting layer 5. The organic insulating layer 2 is disposed on the array substrate 1 and includes a plurality of first protrusions 221, with grooves 222 disposed between adjacent first protrusions 221. The anode 3 is disposed in the grooves 222. The pixel definition layer 4 is disposed on the organic insulating layer 2 and includes a plurality of second protrusions 40, which are disposed on the outer layer of the first protrusions 221. The light-emitting layer 5 is disposed on the anode 3.

[0048] In the embodiments of this application, by forming a plurality of first protrusions 221 and grooves 222 in the organic insulating layer 2, and forming a plurality of second protrusions 40 in the pixel definition layer 4, and setting the second protrusions 40 on the outer layer of the first protrusions 221, the height of the spacing between adjacent grooves 222 can be increased, thereby increasing the amount of ink that the grooves 222 can hold, preventing ink from overflowing from the grooves 222 during inkjet printing, and thus reducing the risk of ink mixing in adjacent grooves 222.

[0049] In the embodiments of this application, the pixel definition layer 4 is hydrophobic and oleophobic, which not only allows the ink sprayed on the pixel definition layer 4 to flow directly into the groove 222 along the side wall of the second protrusion 40, preventing the ink from accumulating on the second protrusion 40, but also prevents the ink in the groove 222 from overflowing along the side wall of the second protrusion 40, thereby further reducing the risk of color mixing.

[0050] In some embodiments, please refer to Figure 1 The array substrate 1 includes a substrate 11 and a driving circuit layer 12, which is disposed on the substrate 11. The driving circuit layer 12 includes a barrier layer 121, an active layer 122, a first gate insulating layer 123, a first gate 124, a second gate insulating layer 125, a second gate 126, an interlayer dielectric layer 127, a first source-drain layer 128, a passivation layer 129, a planarization layer 131, and a second source-drain layer 132, which are sequentially stacked on the substrate 11.

[0051] In practical applications, the film layer structure of the array substrate 1 is not limited to the film layer structure of the array substrate 1 shown in Figure 1 The array substrate 1 can be replaced by an array substrate in a known display panel to achieve the same or similar effects.

[0052] In some embodiments, referring to Figure 1 The anode 3 includes a main body part 31 and an inclined part 32, the inclined part 32 is connected to the main body part 31 and is arranged at an included angle with the main body part 31, the main body part 31 is arranged at the bottom of the groove 222, and the inclined part 32 is arranged on the sidewall of the first protruding part 221.

[0053] It should be noted that the anode 3 is formed after the organic insulating layer 2, the organic insulating layer 2 is first formed on the array substrate 1, then the organic insulating layer 2 is etched to form a plurality of first protruding parts 221 and grooves 222 between adjacent first protruding parts 221, and then the anode 3 is deposited and etched on the organic insulating layer 2. In order to ensure that the anode 3 can cover the bottom of the groove 222, the anode 3 needs to be extended to the sidewall of the first protruding part 221, thereby forming the inclined part 32 on the sidewall of the first protruding part 221. The main body part 31 and the inclined part 32 are continuously arranged and are an integral structure.

[0054] In some embodiments, referring to Figure 1 The flat layer 131 is provided with a via hole, and the main body part 31 of the anode 3 is electrically connected to the second source-drain layer 132 through the via hole on the flat layer 131.

[0055] In some embodiments, referring to Figure 1 The cross-sectional shape of the groove 222 is an inverted trapezoid, and the inclined part 32 and the main body part 31 are arranged at an obtuse included angle.

[0056] In some embodiments, the inclined part 32 is arranged between the sidewall of the first protruding part 221 and the sidewall of the second protruding part 40.

[0057] Referring to Figure 1 The pixel definition layer 4 is formed after the anode 3, the inclined part 32 of the anode 3 is formed on the sidewall of the first protruding part 221, after the pixel definition layer 4 is formed, the second protruding part 40 of the pixel definition layer 4 is not only arranged on the outer layer of the first protruding part 221, but also covers the inclined part 32 on the sidewall of the first protruding part 221, and the main body part 31 of the anode 3 is exposed by the pixel definition layer 4.

[0058] In some embodiments, referring to Figure 2 , Figure 2A partial top view of a display panel is provided for embodiments of the present application. A plurality of anodes 3 are arranged in rows along a first direction X and arranged in columns along a second direction Y. The first direction X is different from the second direction Y. The first protruding portion 221 extends along the second direction Y. The first protruding portion 221 is arranged on both sides of each column of anodes 3.

[0059] In some embodiments, referring to Figure 2 , the first direction X is a horizontal direction, and the second direction Y is a vertical direction. In other embodiments, the first direction X and the second direction Y can also be arranged at an angle, which can be an acute angle or an obtuse angle.

[0060] In some embodiments, referring to 1 and Figure 2 , along a film thickness direction of the organic insulating layer 2, the height of the inclined portion 32 is less than the height of the first protruding portion 221. In this way, the first protruding portion 221 insulates and separates the anodes 3 in adjacent grooves 222, avoiding the anodes 3 in adjacent grooves 222 from being overlapped and causing display abnormalities. It should be noted that the film thickness direction of the organic insulating layer 2 is a direction perpendicular to the plane defined by the first direction X and the second direction Y.

[0061] In some embodiments, referring to Figure 2 and Figure 3 , Figure 3 A cross-sectional view of a display panel along the A-A' direction is provided for embodiments of the present application. The second protruding portion 40 includes a first sub-protruding portion 401. The first sub-protruding portion 401 extends along the second direction Y and is arranged on both sides of each column of anodes 3. The first sub-protruding portion 401 is arranged outside the first protruding portion 221. Part of the inclined portion 32 is arranged between the side wall of the first protruding portion 221 and the side wall of the first sub-protruding portion 401.

[0062] In some embodiments, referring to Figure 2 and Figure 3 , the pixel definition layer 4 includes a first pixel definition layer 41. The first pixel definition layer 41 is arranged on the organic insulating layer 2. The first pixel definition layer 41 includes the first sub-protruding portion 401. The first sub-protruding portion 401 is formed by etching the material of the first pixel definition layer 41.

[0063] In some embodiments, referring to Figure 2 and Figure 4 and Figure 5 , Figure 4 A cross-sectional view of a display panel along the B-B' direction is provided for embodiments of the present application. Figure 5The cross-sectional view of the display panel along the C-C' direction provided by the embodiments of the present application, the second protruding part 40 includes a plurality of second sub-protruding parts 402, the second sub-protruding parts 402 are arranged along the first direction X, the second sub-protruding parts 402 are arranged between any two adjacent rows of the anodes 3, the second sub-protruding parts 402 are arranged on the outer layer of the first protruding part 221, the inclined part 32 is arranged between the side wall of the first protruding part 221 and the side wall of the second sub-protruding part 402, and part of the first sub-protruding parts 401 are arranged on the outer layer of the second sub-protruding part 402. In this way, the height of the interval between the adjacent grooves 222 can be further increased, so that the risk of ink color mixing in the adjacent grooves can be further reduced.

[0064] In some embodiments, referring to Figure 1 , the pixel definition layer 4 further includes a second pixel definition layer 42, the second pixel definition layer 42 is arranged on the organic insulating layer 2, and part of the first pixel definition layer 41 is arranged on the second pixel definition layer 42. The second pixel definition layer 42 includes second sub-protruding parts 402, that is, the second sub-protruding parts 402 are formed by etching the material of the second pixel definition layer 42.

[0065] In some embodiments, referring to Figure 2 , Figure 4 and Figure 6 , Figure 6 The cross-sectional view of the display panel along the D-D' direction provided by the embodiments of the present application, the pixel definition layer 4 further includes a plurality of interval parts 403, the interval parts 403 are arranged in the grooves 222, and the interval parts 403 are continuously arranged with the second sub-protruding parts 402. The interval parts 403 are arranged between any two adjacent rows of the anodes 3, and along the film thickness direction of the pixel definition layer 4, the interval parts 403 cover one end of the adjacent two rows of the anodes 3 close to each other.

[0066] In some embodiments, referring to Figure 2 , Figure 4 and Figure 6 , the second pixel definition layer 42 includes the second sub-protruding parts 402 and the interval parts 403, and the second sub-protruding parts 402 and the interval parts 403 are formed by etching the material of the second pixel definition layer 42. When the second pixel definition layer 42 is formed, the second sub-protruding parts 402 are formed on the outer layer of the first protruding part 221, the interval parts 403 are formed in the grooves 222, the second sub-protruding parts 402 and the interval parts 403 are alternately repeated and continuously arranged along the first direction X, and the second sub-protruding parts 402 and the interval parts 403 can be regarded as an integral structure.

[0067] In some embodiments, referring to Figure 1 and Figure 7 , Figure 8This is a schematic diagram of an organic insulating layer in a display panel provided in an embodiment of this application. The organic insulating layer 2 includes a first organic insulating layer 21 and a second organic insulating layer 22. The first organic insulating layer 21 is disposed on the array substrate 1, and the second organic insulating layer 22 is disposed on the first organic insulating layer 21. The second organic insulating layer 22 includes a first protrusion 221 and a groove 222. Along the film thickness direction of the second organic insulating layer 22, the depth of the groove 222 is the same as the thickness of the second organic insulating layer 22.

[0068] In some embodiments, please refer to Figure 8 , Figure 1 This is a schematic diagram of an organic insulating layer in a display panel provided for an embodiment of this application. The width of the first protrusion 221 is 10 micrometers, the height of the first sub-protrusion 401 is 3 micrometers, and the width of the first sub-protrusion 401 is 14 micrometers.

[0069] In some embodiments, please refer to Figure 8 and Figure 9 The organic insulating layer 2 includes a first organic insulating layer 21 and a second organic insulating layer 22. The first organic insulating layer 21 is disposed on the array substrate 1, and the second organic insulating layer 22 is disposed on the first organic insulating layer 21. The second organic insulating layer 22 includes a flat portion 223, a first protrusion 221, and a groove 222. The flat portion 223 is disposed on the first organic insulating layer 21, and the first protrusion 221 is disposed on the flat portion 223. Along the film thickness direction of the second organic insulating layer 22, the depth of the groove 222 is less than the thickness of the second organic insulating layer 22. In this way, the flat portion of the second organic insulating layer 22 can be retained, thereby maintaining the flatness of the organic insulating layer 2. At the same time, the height of the spacing between adjacent grooves 222 can be increased, reducing the risk of ink mixing in adjacent grooves 222.

[0070] Based on the display panel provided in the above embodiments of this application, embodiments of this application also provide a display device. Please refer to [link to relevant documentation]. Figure 9 , ​ This is a schematic diagram of the structure of a display device provided in an embodiment of this application. The display device 1000 includes a display panel 100 and a housing 200. The display panel 100 is disposed on the housing 200. The display panel 100 can be any of the display panels provided in the above embodiments. The display device provided in the embodiments of this application can achieve the same technical effects as the display panels provided in any of the above embodiments, and will not be described in detail here.

[0071] The embodiment of the present application has the beneficial effects that the embodiment of the present application provides a display panel and a display device, the display panel comprises an array substrate, an organic insulating layer, an anode, a pixel definition layer and a light-emitting layer, the organic insulating layer is arranged on the array substrate, the organic insulating layer comprises a plurality of first protruding parts, a groove is arranged between adjacent first protruding parts, the anode is arranged in the groove, the pixel definition layer is arranged on the organic insulating layer, the pixel definition layer comprises a plurality of second protruding parts, the second protruding parts are arranged on the outer layer of the first protruding parts, and the light-emitting layer is arranged on the anode. By forming a plurality of first protruding parts and grooves on the organic insulating layer and forming a plurality of second protruding parts on the pixel definition layer, the second protruding parts are arranged on the outer layer of the first protruding parts, the height of the interval between adjacent grooves can be increased, the amount of ink that can be accommodated by the groove is increased in this way, and the risk of color mixing can be reduced when ink is jet printed.

[0072] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0073] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0074] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0075] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, but any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, without departing from the technical solution content of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A display panel, characterized in that, include: Array substrate; An organic insulating layer is disposed on the array substrate, the organic insulating layer including a plurality of first protrusions, and a groove is provided between adjacent first protrusions; The anode includes a main body and an inclined portion. The inclined portion is connected to the main body and is set at an angle to the main body. The main body is located at the bottom of the groove, and the inclined portion is located on the side wall of the first protrusion. A pixel definition layer is disposed on the organic insulating layer, and the pixel definition layer includes a plurality of second protrusions, the second protrusions being disposed on the outer layer of the first protrusions; as well as A light-emitting layer is disposed on the anode.

2. The display panel as described in claim 1, characterized in that, The second protrusion is disposed on the first protrusion and part of the anode, and the inclined portion of the anode is disposed between the sidewall of the first protrusion and the sidewall of the second protrusion.

3. The display panel as described in claim 1, characterized in that, The plurality of anodes are arranged in a row at intervals along a first direction, and the plurality of anodes are arranged in a column at intervals along a second direction, wherein the first direction and the second direction are different; The first protrusion extends along the second direction and is disposed on both sides of each column of anodes.

4. The display panel as described in claim 1, characterized in that, Along the thickness direction of the organic insulating layer, the height of the inclined portion is less than the height of the first protrusion.

5. The display panel as described in claim 3, characterized in that, The second protrusion includes a first sub-protrusion, which extends along the second direction and is disposed on both sides of each column of anodes; The first sub-protrusion is disposed on the outer layer of the first protrusion, and the inclined portion is disposed between the side wall of the first protrusion and the side wall of the first sub-protrusion.

6. The display panel as described in claim 5, characterized in that, The second protrusion includes a plurality of second sub-protrusions, the second sub-protrusions extending along the first direction and disposed between any two adjacent rows of anodes; The second sub-protrusion is disposed on the outer layer of the first protrusion, the inclined portion is disposed between the side wall of the first protrusion and the side wall of the second sub-protrusion, and a portion of the first sub-protrusion is disposed on the outer layer of the second sub-protrusion.

7. The display panel as described in claim 6, characterized in that, The pixel definition layer further includes a plurality of spacing portions, which are disposed in the groove and are continuously disposed with the second sub-protrusion portion; The spacing portion is disposed between any two adjacent rows of anodes, along the film thickness direction of the pixel definition layer, and covers the ends of the two adjacent rows of anodes that are close to each other.

8. The display panel as described in claim 1, characterized in that, The organic insulating layer comprises: A first organic insulating layer is disposed on the array substrate; A second organic insulating layer is disposed on the first organic insulating layer; The second organic insulating layer includes the first protrusion and the groove, and the depth of the groove is the same as the thickness of the second organic insulating layer along the film thickness direction of the second organic insulating layer.

9. The display panel as claimed in claim 1, characterized in that, The organic insulating layer comprises: A first organic insulating layer is disposed on the array substrate; A second organic insulating layer is disposed on the first organic insulating layer; The second organic insulating layer includes a flat portion, a first protrusion, and a groove. The flat portion is disposed on the first organic insulating layer, and the first protrusion is disposed on the flat portion. Along the film thickness direction of the second organic insulating layer, the depth of the groove is less than the thickness of the second organic insulating layer.

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