CN113193140B - Display panel and manufacturing method thereof - Google Patents
Display panel and manufacturing method thereof Download PDFInfo
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- CN113193140B CN113193140B CN202110408884.4A CN202110408884A CN113193140B CN 113193140 B CN113193140 B CN 113193140B CN 202110408884 A CN202110408884 A CN 202110408884A CN 113193140 B CN113193140 B CN 113193140B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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Abstract
The invention discloses a display panel and a manufacturing method thereof, wherein the display panel comprises a plane display area and at least one curved surface display area adjacent to the plane display area; the display panel further includes a light emitting functional layer; the light-emitting functional layer comprises an anode layer, the anode layer comprises a main anode sublayer and a secondary anode sublayer, the main anode sublayer and the secondary anode sublayer are located in the curved surface display area and are arranged at intervals, the part, located in the plane display area, of the display panel faces the first direction, the main anode sublayer faces the second direction, the secondary anode sublayer faces the third direction, and the included angle between the third direction and the first direction is smaller than that between the second direction and the first direction. The invention can compensate the light loss of the curved surface display area under a large visual angle due to bending by arranging the secondary anode sublayer, can effectively reduce the phenomena of uneven display and color cast of the curved surface display area and the flat surface display area, and improves the display effect of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a manufacturing method thereof.
Background
An Organic Light-Emitting Diode (OLED) display is widely used because it has the advantages of flexibility, high Light-Emitting efficiency, fast response speed, etc., and at present, in order to improve the screen occupation ratio of the OLED display panel, the OLED display panel is usually designed into a curved screen structure including a planar area and a curved area having a certain radian with the planar area.
Disclosure of Invention
The embodiment of the invention provides a display panel and a manufacturing method thereof, and aims to solve the technical problem that a plane area and a curved area in a curved screen structure have brightness difference.
The embodiment of the invention provides a display panel, which comprises a plane display area and at least one curved surface display area adjacent to the plane display area, wherein the part of the display panel, which is positioned in the plane display area, faces to a first direction;
the display panel includes: the light-emitting device comprises a substrate, a thin film transistor layer arranged on the substrate and a light-emitting functional layer arranged on the thin film transistor layer;
the anode layer comprises a main anode sublayer and a secondary anode sublayer, the main anode sublayer and the secondary anode sublayer are arranged in the curved surface display area at intervals, the main anode sublayer faces the second direction, the secondary anode sublayer faces the third direction, and the third direction is smaller than the included angle of the first direction.
In an embodiment of the invention, the display panel further includes a pixel definition layer disposed on the thin-film transistor layer, the pixel definition layer includes a plurality of pixel openings located in the curved display area, each pixel opening includes an opening bottom and an opening sidewall forming a preset inclination angle with the opening bottom, the main anode sublayer is disposed at the opening bottom, and the sub anode sublayer is disposed on the opening sidewall of one side of the pixel opening away from the flat display area.
In an embodiment of the invention, the thin film transistor layer includes a first thin film transistor, a second thin film transistor, and a first insulating layer covering the first thin film transistor and the second thin film transistor, the first thin film transistor is connected to the primary anode sub-layer, and the second thin film transistor is connected to the secondary anode sub-layer.
In an embodiment of the present invention, the pixel defining layer is disposed on the first insulating layer, the first thin film transistor includes a first gate, a first source, and a first drain, the second thin film transistor includes a second gate, a second source, and a second drain, the first drain is connected to the primary anode sublayer, and the second drain is connected to the secondary anode sublayer;
the first drain electrode top is equipped with and passes the first via hole of first insulating layer, second drain electrode top is equipped with and passes first insulating layer with the second via hole on pixel definition layer, the main positive pole sublayer passes first via hole with first drain electrode is connected, be equipped with the linkage segment on the pixel definition layer, linkage segment one end with inferior positive pole sublayer is connected, the linkage segment other end passes the second via hole with the second drain electrode is connected.
In an embodiment of the present invention, the material of the connecting section is the same as the material of the sub-anode layer, and the connecting section and the sub-anode layer are in an integrally formed structure.
In an embodiment of the present invention, a second insulating layer is disposed on the connection segment and the pixel defining layer to cover the connection segment, and the light emitting function layer includes an organic light emitting layer disposed on the primary anode sublayer and the secondary anode sublayer, and a cathode layer disposed on the pixel defining layer, the organic light emitting layer, and the second insulating layer to cover the organic light emitting layer and the second insulating layer.
In an embodiment of the invention, the display panel includes a non-active display area located between the pixel openings, and the second thin film transistor is disposed in the non-active display area.
In an embodiment of the invention, the plurality of pixel openings include a plurality of pixel opening groups parallel to each other, each pixel opening group includes at least two pixel openings, and in two adjacent pixel opening groups:
wherein the positions of the pixel openings in one of the pixel opening groups correspond to the positions of the pixel openings in the other pixel opening group one by one, or
The positions of the pixel openings in one pixel opening group and the positions of the pixel openings in the other pixel opening group are arranged in a staggered mode.
In an embodiment of the invention, the plurality of pixel openings at least include a first pixel opening corresponding to display a first color and a second pixel opening corresponding to display a second color, the sub-anode layer includes a first sub-anode layer disposed in the first pixel opening and a second sub-anode layer disposed in the second pixel opening, the first sub-anode layer is configured to perform driving compensation according to a brightness attenuation characteristic of the first color, and the second sub-anode layer is configured to perform driving compensation according to a brightness attenuation characteristic of the second color.
According to the above object of the present invention, there is provided a method for manufacturing a display panel, comprising the steps of:
providing a substrate, forming a thin film transistor layer on the substrate, wherein the display panel comprises a flat display area and at least one curved display area adjacent to the flat display area, and the part of the display panel located in the flat display area faces a first direction;
form luminous functional layer on the thin film transistor layer, luminous functional layer including form in the anode layer of thin film transistor layer top, the anode layer is including being located in the curved surface display area and the interval main anode sublayer and the time anode sublayer that sets up, main anode sublayer is towards the second direction, time anode sublayer is towards the third direction, the third direction with the contained angle of first direction is less than the second direction with the contained angle of first direction.
The invention has the beneficial effects that: the invention arranges a main anode sublayer and a secondary anode sublayer in an anode layer of a curved surface display area, wherein the part of a display panel positioned in a plane display area faces a first direction, the main anode sublayer faces a second direction, the secondary anode sublayer faces a third direction, and an included angle between the third direction and the first direction is smaller than an included angle between the second direction and the first direction; for the part of the display panel located in the curved surface display area, the secondary anode sublayer is additionally arranged, and the facing direction of the secondary anode sublayer is more deviated to the first direction than that of the main anode sublayer, so that the light emitting direction of the secondary anode sublayer corresponding to the light emitting function layer is also more deviated to the first direction, and further the quantity and the intensity of light emitted by the curved surface display area towards the front viewing angle are increased, light lost by the curved surface display area under a large viewing angle due to bending is compensated, the phenomena of uneven display and color cast of the curved surface display area and the flat surface display area can be effectively reduced, and the display effect of the display panel is improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
FIG. 1A is a top view and a front view of a display panel;
FIG. 1B is a schematic diagram of a conventional display panel;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a front view of a display panel provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the invention, corresponding to a single pixel opening;
fig. 5 is a schematic plane distribution diagram of the primary anode sublayer and the secondary anode sublayer provided in the embodiment of the present invention;
FIG. 6A is a graph of luminance of a red sub-pixel at different viewing angles according to an embodiment of the present invention;
FIG. 6B is a graph of luminance for different viewing angles for the blue sub-pixel according to an embodiment of the present invention;
FIG. 6C is a graph of luminance of the green sub-pixel at different viewing angles according to an embodiment of the present invention;
FIG. 7 is a schematic plane view of a pixel aperture according to an embodiment of the present invention;
FIG. 8 is a schematic plan view of another pixel aperture provided in accordance with an embodiment of the present invention;
fig. 9 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention;
fig. 10 to 16 are schematic views of a manufacturing process structure of a display panel according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1A and fig. 1B, for a curved display panel, which includes a flat display area AP and a curved display area AQ, and the curved display panel further includes a substrate 1, a thin film transistor 2 disposed on the substrate 1, a light emitting function layer disposed on the thin film transistor 2, a first inorganic encapsulation layer 6, an organic encapsulation layer 7 and a second inorganic encapsulation layer 8 sequentially disposed on the light emitting function layer, wherein the light emitting function layer includes an anode 3 connected to the thin film transistor 2, an organic light emitting layer 4 disposed on the anode 3 and a cathode layer 5 disposed on the organic light emitting layer 4, and the above structures are the same in the flat display area AP and the curved display area AQ, so that after the side of the curved display panel is bent, for the curved display area AQ, the angle of light emitted by the light emitting function layer and the light emitted by the flat display area AP is relatively large, when a user looks at the curved display panel, the display brightness and color of the curved display area AQ are greatly different from those of the flat display area AP, resulting in uneven display and color cast, thereby affecting the display effect of the curved display panel.
To solve the above technical problems, an embodiment of the present invention provides a display panel, please refer to fig. 2 and fig. 3, in which the display panel includes a flat display area AP and at least one curved display area AQ adjacent to the flat display area AP, and a portion of the display panel located in the flat display area AP faces a first direction X1.
The display panel further includes a substrate 10, a thin-film transistor layer 20 disposed on the substrate 10, and a light-emitting functional layer 30 disposed on the thin-film transistor layer 20.
The light emitting function layer 30 includes an anode layer disposed on the thin film transistor layer 20, and the anode layer includes a main anode sublayer 31 and a sub anode sublayer 32 disposed in the curved display area AQ at an interval, the main anode sublayer 31 faces the second direction X2, the sub anode sublayer 32 faces the third direction X3, and an included angle between the third direction X3 and the first direction X1 is smaller than an included angle between the second direction X2 and the first direction X1.
In an implementation process, the embodiment of the present invention provides the main anode sublayer 31 and the sub-anode sublayer 32 in the anode layer of the curved display area AQ, wherein a portion of the display panel located in the flat display area AP faces the first direction X1, the main anode sublayer 31 faces the second direction X2, the sub-anode sublayer 32 faces the third direction X3, and an angle between the third direction X3 and the first direction X1 is smaller than an angle between the second direction X2 and the first direction X1. For the part of the display panel located in the curved surface display area AQ, because the sub-anode sublayer 32 is additionally arranged, and the facing direction of the sub-anode sublayer 32 is more deviated to the first direction X1 than that of the main anode sublayer 31, the light emitting direction of the sub-anode sublayer 32 corresponding to the light emitting function layer 30 is also more deviated to the first direction X1, and then the amount and the intensity of light emitted by the curved surface display area AQ towards the front viewing angle are increased, light lost by the curved surface display area AQ under a large viewing angle due to bending is compensated, the phenomena of uneven display and color cast of the curved surface display area AQ and the flat surface display area AP can be effectively reduced, and the display effect of the display panel is improved.
It should be noted that, as the curvature of the curved display area AQ changes, the facing direction (the second direction X2) of the main anode sublayer 31 and the facing direction (the third direction X3) of the sub-anode sublayer 32 will change, but at any position of the curved display area AQ, the included angle between the third direction X3 and the first direction X1 is smaller than the included angle between the second direction X2 and the first direction X1, and the directions of the second direction X2 and the third direction X3 in the illustration provided by the embodiment of the present invention are only for illustration and are not limited thereto.
Referring to fig. 2 and 3, the display panel includes a substrate 10, a thin-film transistor layer 20 disposed on the substrate 10, a light-emitting functional layer 30 disposed on the thin-film transistor layer 20, and an encapsulation layer 60 disposed on the light-emitting functional layer 30.
Specifically, the substrate 10 includes a base plate 11 and a buffer layer 12 disposed on the base plate 11. The thin film transistor layer 20 includes an interlayer insulating layer 22, a gate insulating layer 23, and a first insulating layer 24 sequentially disposed on the substrate 10, and the thin film transistor layer 20 further includes a first thin film transistor 21 disposed on the substrate 10.
Further, the first thin film transistor 21 includes a first active layer 211 disposed on the substrate 10 and covered by the interlayer insulating layer 22, a first gate electrode 214 disposed on the interlayer insulating layer 22 and covered by the gate insulating layer 23, and a first source electrode 212 and a first drain electrode 213 disposed on the gate insulating layer 23 and covered by the first insulating layer 24, wherein the first source electrode 212 and the first drain electrode 213 are respectively overlapped with both sides of the first active layer 211 by a via hole passing through the gate insulating layer 23 and the interlayer insulating layer 22.
The light emitting function layer 30 includes an anode layer disposed on the first insulating layer 24, an organic light emitting layer 33 disposed on the anode layer, and a cathode layer 34 disposed on the organic light emitting layer 33. The display panel further includes a pixel defining layer 40 disposed on the first insulating layer 24, and the pixel defining layer 40 defines a plurality of pixel openings 41, each of which includes an opening bottom and an opening sidewall forming a predetermined angle with the opening bottom.
The encapsulation layer 60 includes a first inorganic encapsulation layer 61 covering the cathode layer 34, an organic encapsulation layer 62 disposed on the first inorganic encapsulation layer 61, and a second inorganic encapsulation layer 63 covering the organic encapsulation layer 62.
In the embodiment of the present invention, the display panel further includes a flat display area AP and a curved display area AQ, and the anode layer includes a main anode sublayer 31 and a sub anode sublayer 32 located in the curved display area AQ, wherein the main anode sublayer 31 is located at the bottom of the opening of the pixel opening 41, the sub anode sublayer 32 is located on the sidewall of the opening of the pixel opening 41 on the side away from the flat display area AP, and the main anode sublayer 31 is spaced from the sub anode sublayer 32. The organic light emitting layer 33 is disposed on the main anode sublayer 31 and the sub-anode sublayer 32 and is overlapped with the main anode sublayer 31 and the sub-anode sublayer 32, and the cathode layer 34 is disposed on the organic light emitting layer 33, so that when a voltage is applied to the anode layer and the cathode layer 34, the portions of the organic light emitting layer 33 corresponding to the main anode sublayer 31 and the sub-anode sublayer 32 can emit light.
Further, the portion of the display panel located in the planar display area AP faces the first direction X1, the main anode sublayer 31 faces the second direction X2, the sub-anode sublayer 32 faces the third direction X3, and the included angle between the third direction X3 and the first direction X1 is smaller than the included angle between the second direction X2 and the first direction X1.
In the embodiment of the present invention, the sub-anode layer 32 is disposed on the opening sidewall of the pixel opening 41, so that the organic light emitting layer 33 on the opening sidewall can emit light, because the facing direction of the sub-anode layer 32 is more biased to the first direction X1, the direction of the light emitted from the organic light emitting layer 33 corresponding to the sub-anode layer 32 is more biased to the first direction X1, as indicated by the dotted arrow in fig. 3, and the direction indicated by the solid arrow in fig. 3 is the direction of the light emitted from the organic light emitting layer 33 corresponding to the main anode layer 31, and further the amount and intensity of the light emitted from the curved surface display area AQ towards the front viewing angle are increased, thereby compensating the light lost by the curved surface display area AQ under a large viewing angle due to bending, effectively reducing the display unevenness and color cast of the curved surface display area AQ and the flat surface display area AP, and improving the display effect of the display panel.
It should be noted that the portion of the anode layer located in the curved display area AQ includes the main anode sublayer 31 and the sub-anode sublayer 32, and the portion of the anode layer located in the flat display area AP may be only disposed at the bottom of the opening of the pixel opening 41, which can be implemented by referring to the conventional process, and is not described herein again.
In the embodiment of the present invention, referring to fig. 4 and fig. 5, which are schematic structural diagrams corresponding to a single pixel opening provided in the embodiment of the present invention, the main anode sublayer 31 and the sub-anode sublayer 32 are spaced apart and connected to different transistors, respectively, wherein the main anode sublayer 31 is connected to the first thin film transistor 21, and the sub-anode sublayer 32 is connected to the second thin film transistor 25.
Specifically, the thin-film transistor layer 20 further includes a second thin-film transistor 25, and the second thin-film transistor 25 includes a second active layer 251 disposed on the substrate 10 and covered by the interlayer insulating layer 22, a second gate electrode 254 disposed on the interlayer insulating layer 22 and covered by the gate insulating layer 23, and a second source electrode 252 and a second drain electrode 253 disposed on the gate insulating layer 23 and covered by the first insulating layer 24. The second source electrode 252 and the second drain electrode 253 are respectively overlapped with both sides of the second active layer 251 through via holes passing through the gate insulating layer 23 and the interlayer insulating layer 22.
In this embodiment, the first drain electrode 213 is electrically connected to the main anode sublayer 31, and the second drain electrode 253 is electrically connected to the sub-anode sublayer 32, wherein the display panel includes a first via hole passing through the first insulating layer 24 and a second via hole passing through the pixel defining layer 40 and the first insulating layer 24, the main anode sublayer 31 passes through the first via hole and is connected to the first drain electrode 213, and the sub-anode sublayer 32 is electrically connected to the second drain electrode 253 through the second via hole. Further, the display panel further includes a connection segment 321 disposed on the pixel defining layer 40, and one end of the connection segment 321 is connected to the sub-anode sublayer 32, and the other end passes through the second via hole and is connected to the second drain 253, so as to electrically connect the sub-anode sublayer 32 and the second drain 253. It should be noted that the display panel further includes a second insulating layer 50 disposed on the connecting segment 321, and the second insulating layer 50 covers the connecting segment 321 and is located between the connecting segment 321 and the cathode layer 34 to isolate the connecting segment 321 and the cathode layer 34 and prevent an electrical short circuit from occurring.
Optionally, the material of the sub-anode sublayer 32 is the same as the material of the connecting section 321, and the sub-anode sublayer 32 and the connecting section 321 are an integrally formed structure, so that the process can be saved.
In the embodiment of the present invention, the first thin film transistor 21 transmits an electrical signal to the main anode layer 31, and the second thin film transistor 25 transmits an electrical signal to the sub-anode layer 32, so that light lost by the curved surface display area AQ due to bending at a large viewing angle can be compensated by light emission of the organic light emitting layer 33 corresponding to the sub-anode layer 32, display unevenness and color shift of the curved surface display area AQ and the planar display area AP can be effectively reduced, and the display effect of the display panel is improved.
The display panel includes an inactive display area between the pixel openings 41, and the second thin film transistor 25 is disposed in the inactive display area, that is, the second thin film transistor 25 can be disposed between the adjacent pixel openings 41, so as to improve the aperture ratio of the display panel.
The embodiment of the present invention is described by only using the structure corresponding to one pixel opening 41 in the curved surface display area AQ of the display panel, and the structures corresponding to the remaining pixel openings 41 are the same as the above structures, and are not described again.
In the embodiment of the present invention, the plurality of pixel openings 41 at least include a first pixel opening corresponding to display a first color and a second pixel opening corresponding to display a second color, the main anode sublayer 31 includes a first main anode sublayer disposed in the first pixel opening and a second main anode sublayer disposed in the second pixel opening, the sub anode sublayer 32 includes a first sub anode sublayer disposed in the first pixel opening and a second sub anode sublayer disposed in the second pixel opening, the first sub anode sublayer is configured to perform driving compensation according to a brightness attenuation characteristic of the first color, and the second sub anode sublayer is configured to perform driving compensation according to a brightness attenuation characteristic of the second color.
Furthermore, the first sub-anode layer is connected with a first driving voltage, and the second sub-anode layer is connected with a second driving voltage. When the brightness attenuation degree of the first color is larger than that of the second color, the first driving voltage is larger than the second driving voltage.
In the implementation and application process, please refer to fig. 6A, 6B, and 6C, as can be seen from the curves in the figures, the brightness attenuation degrees of the pixels with different colors are different under the variation of the viewing angles, so that the brightness of the pixels with different colors in the curved surface display area AQ is different under different viewing angles.
It should be noted that the driving circuits of the main anode sublayer 31 and the sub anode sublayer 32 may be the same or different, and specifically may include driving circuits such as 2T1C, 3T1C, or 5T2C, and the driving circuits are driven by the driving module, and the driving voltage applied to the sub anode sublayer 32 may be set, so that the pixels with different colors in the curved surface display area AQ may emit light with uniform brightness at the same viewing angle. In addition, with the change of the bending radian of the curved surface display area AQ, the light-emitting brightness of the pixel is changed under the front viewing angle. Therefore, the driving voltage applied to the sub-anode layer 32 can be adjusted according to the variation of the curvature of the curved display area AQ. For example, for pixels located at different curvature radians and having the same color, that is, a first pixel and a second pixel, along with the change of the curved surface display area AQ radians, the sub-anode sublayer 32 in the first pixel faces the fourth direction, the sub-anode sublayer 32 in the second pixel faces the fifth direction, and an included angle between the fourth direction and the first direction X1 is smaller than an included angle between the fifth direction and the first direction X1, so that the driving voltage applied to the sub-anode sublayer 32 in the first pixel is smaller than the driving voltage applied to the sub-anode sublayer 32 in the second pixel. The brightness of the pixels with different radians in the curved-surface display area AQ at the front viewing angle tends to be consistent, so that the display uniformity is improved, and the color cast phenomenon is reduced.
As can be seen from fig. 6A, 6B, and 6C, the degree of attenuation of the green pixels is greater than that of the red pixels, and the degree of attenuation of the red pixels is greater than that of the blue pixels.
Optionally, the driving voltage applied to the sub-anode sublayer 32 corresponding to the green pixel is greater than the driving voltage applied to the sub-anode sublayer 32 corresponding to the red pixel, and the driving voltage applied to the sub-anode sublayer 32 corresponding to the red pixel is greater than the driving voltage applied to the sub-anode sublayer 32 corresponding to the blue pixel, so that the luminance of the pixels with different colors in the curved surface display area AQ tends to be consistent at the same viewing angle, thereby improving the display uniformity, reducing the color shift, and improving the display effect.
In the embodiment of the present invention, the plurality of pixel openings 41 are uniformly distributed in the display panel, wherein the plurality of pixel openings 41 include a plurality of pixel opening groups parallel to each other, each of the pixel opening groups includes at least two pixel openings 41, and in two adjacent pixel opening groups:
referring to fig. 7, in an embodiment of the invention, the positions of the pixel openings 41 in one pixel opening group correspond to the positions of the pixel openings 41 in another pixel opening group one by one, that is, the pixel openings 41 in two adjacent rows are arranged in a one-to-one correspondence manner.
Referring to fig. 8, in another embodiment of the present invention, the positions of the pixel openings 41 in one pixel opening group and the positions of the pixel openings 41 in another pixel opening group are arranged in a staggered manner, i.e., the pixel openings 41 in two adjacent rows are arranged in a staggered manner.
In summary, in the embodiment of the invention, the main anode sublayer 31 and the sub-anode sublayer 32 are disposed in the anode layer of the curved display area AQ, wherein a portion of the display panel located in the flat display area AP faces the first direction X1, the main anode sublayer 31 faces the second direction X2, the sub-anode sublayer 32 faces the third direction X3, and an included angle between the third direction X3 and the first direction X1 is smaller than an included angle between the second direction X2 and the first direction X1. For the portion of the display panel located in the curved display area AQ, because the sub-anode sublayer 32 is additionally arranged, and the facing direction of the sub-anode sublayer 32 is more deviated to the first direction X1 than the main anode sublayer 31, the light emitting direction of the sub-anode sublayer 32 corresponding to the light emitting functional layer 30 is also more deviated to the first direction X1, and further the amount and intensity of light emitted by the curved display area AQ towards the front viewing angle are increased, so that light lost by the curved display area AQ under a large viewing angle due to bending is compensated. Furthermore, in the embodiment of the present invention, different driving voltages are set according to the brightness attenuation characteristics of the pixels with different colors to be transmitted to the sub-anode layer 32, so that the brightness of the pixels with different colors in the curved surface display area AQ is consistent at the same viewing angle, thereby improving the problem of different brightness attenuation degrees of the pixels with different colors at different viewing angles, effectively reducing the display unevenness and color cast phenomena of the curved surface display area AQ and the planar display area AP, and improving the display effect of the display panel.
In addition, an embodiment of the present invention further provides a method for manufacturing a display panel, please refer to fig. 3, fig. 4, fig. 9, fig. 10, fig. 11, fig. 12, fig. 13, fig. 14, fig. 15, and fig. 16, the method includes the following steps:
s10, providing a substrate 10, and forming a thin-film transistor layer 20 on the substrate 10, wherein the display panel includes a flat display area AP and at least one curved display area AQ adjacent to the flat display area AP, and a portion of the display panel located in the flat display area AP faces the first direction X1.
The display panel provided by the embodiment of the invention comprises a flat display area AP and at least one curved display area AQ adjacent to the flat display area AP, wherein a portion of the display panel located in the flat display area AP faces to the first direction X1.
A substrate 11 is provided, and the substrate 11 is a flexible substrate, and the material thereof includes polyimide. And a buffer layer 12 and a base plate 11 are prepared to form the substrate 10.
A thin film transistor layer 20 is formed on the substrate 10, wherein the thin film transistor layer 20 includes a first thin film transistor 21 and a second thin film transistor 25, an interlayer insulating layer 22 disposed on the substrate 10, a gate insulating layer 23 disposed on the interlayer insulating layer 22, and a first insulating layer 24 disposed on the gate insulating layer 23, and the first insulating layer 24 covers the first thin film transistor 21 and the second thin film transistor 25. The material of the interlayer insulating layer 22, the gate insulating layer 23 and the first insulating layer 24 may be a single layer film of silicon nitride or silicon oxide, or a stacked layer film of silicon nitride and silicon oxide, which is not limited herein.
The first thin film transistor 21 includes a first active layer 211 disposed on the substrate 10 and covered by the interlayer insulating layer 22, a first gate electrode 214 disposed on the interlayer insulating layer 22 and covered by the gate insulating layer 23, and a first source electrode 212 and a first drain electrode 213 disposed on the gate insulating layer 23 and covered by the first insulating layer 24, wherein the first source electrode 212 and the first drain electrode 213 are respectively overlapped with both sides of the first active layer 211 by a via hole passing through the gate insulating layer 23 and the interlayer insulating layer 22.
The second thin film transistor 25 includes a second active layer 251 disposed on the substrate 10 and covered by the interlayer insulating layer 22, a second gate electrode 254 disposed on the interlayer insulating layer 22 and covered by the gate insulating layer 23, and a second source electrode 252 and a second drain electrode 253 disposed on the gate insulating layer 23 and covered by the first insulating layer 24. The second source electrode 252 and the second drain electrode 253 are respectively overlapped with both sides of the second active layer 251 through via holes passing through the gate insulating layer 23 and the interlayer insulating layer 22.
And a first via hole is formed over the first drain 213 by masking and etching.
S20, forming a light emitting functional layer 30 on the thin film transistor layer 20, where the light emitting functional layer 30 includes an anode layer formed above the thin film transistor layer 20, the anode layer includes a main anode sublayer 31 and a sub-anode sublayer 32 located in the curved display area AQ and arranged at an interval, the main anode sublayer 31 faces the second direction X2, the sub-anode sublayer 32 faces the third direction X3, and an included angle between the third direction X3 and the first direction X1 is smaller than an included angle between the second direction X2 and the first direction X1.
The main anode sublayer 31 is formed on the first insulating layer 24 by masking and etching, and the main anode sublayer 31 passes through the first via hole and is connected to the first drain 213.
A pixel defining layer 40 is prepared on the first insulating layer 24, and the patterned pixel defining layer 40 has a plurality of pixel openings 41 and second via holes. Each pixel opening 41 includes an opening bottom and an opening sidewall, the opening bottom correspondingly exposes a portion of the upper surface of the main anode sublayer 31, and the second via hole exposes a portion of the upper surface of the second drain electrode 253.
The sub-anode sublayer 32 and the connection segment 321 are integrally formed on the pixel defining layer 40 by using the same material, wherein the sub-anode sublayer 32 is located on the opening sidewall of the pixel opening 41 and spaced from the main anode sublayer 31, the connection segment 321 is located on the pixel defining layer 40, one end of the connection segment 321 is connected to the sub-anode sublayer 32, and the other end passes through the second via hole and is connected to the second drain 253, so that the sub-anode sublayer 32 is electrically connected to the second drain 253.
The second insulating layer 50 is disposed on the pixel defining layer 40, and the second insulating layer 50 covers the connecting segment 321 to prevent electrical short.
The organic light emitting layer 33 is prepared in the pixel opening 41 by evaporation and mask processes, and the organic light emitting layer 33 is located at the bottom of the opening and at the sidewall of the opening, i.e. the organic light emitting layer 33 is located on the primary anode sublayer 31 and the secondary anode sublayer 32.
The cathode layer 34 is formed on the organic light emitting layer 33, the second insulating layer 50 and the pixel defining layer 40 by evaporation and mask processes.
An encapsulation layer 60 is then prepared on cathode layer 34, wherein encapsulation layer 60 includes a first layerAn inorganic encapsulation layer 61, an organic encapsulation layer 62 and a second inorganic encapsulation layer 63, wherein the materials of the first inorganic encapsulation layer 61 and the second inorganic encapsulation layer 63 each independently comprise Al2O3、TiO2、SiNx、SiCNxAnd SiOxThe material of the organic encapsulation layer 62 includes one or more of acrylic, hexamethyldisiloxane, polyacrylates, polycarbonates, and polystyrene.
In the embodiment of the present invention, the primary anode sublayer 31 faces the second direction X2, the secondary anode sublayer 32 faces the third direction X3, and an included angle between the third direction X3 and the first direction X1 is smaller than an included angle between the second direction X2 and the first direction X1. The light emitting direction of the sub-anode sublayer 32 corresponding to the light emitting functional layer 30 is also biased to the first direction X1, so that the amount and intensity of light emitted from the curved surface display area AQ towards the front viewing angle are increased, light lost by the curved surface display area AQ at a large viewing angle due to bending is compensated, the display unevenness and color cast of the curved surface display area AQ and the flat surface display area AP can be effectively reduced, and the display effect of the display panel is improved.
The embodiment of the present invention further provides a display device, and the display device includes the display panel described in the above embodiments, and the structure thereof is the same as that in the above embodiments, and is not described herein again.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the manufacturing method thereof provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained by applying a specific example herein, and the description of the embodiment is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A display panel is characterized by comprising a plane display area and at least one curved surface display area adjacent to the plane display area, wherein the part of the display panel positioned in the plane display area faces to a first direction;
the display panel includes: the pixel definition layer comprises a plurality of pixel openings positioned in the curved surface display area, and each pixel opening comprises an opening bottom and an opening side wall forming a preset inclination angle with the opening bottom;
the luminous functional layer comprises an anode layer arranged on the thin film transistor layer, the anode layer comprises a main anode sublayer and a secondary anode sublayer, the main anode sublayer and the secondary anode sublayer are arranged in the curved surface display area and are arranged at intervals, the main anode sublayer is arranged at the bottom of the opening, the secondary anode sublayer is arranged on one side, away from the pixel opening, of the plane display area, on the side wall of the opening, the main anode sublayer faces the second direction, the secondary anode sublayer faces the third direction, the included angle between the third direction and the first direction is smaller than that between the second direction and the first direction, and the secondary anode sublayer is used for driving and compensating according to the brightness attenuation characteristic of corresponding display colors in the pixel opening.
2. The display panel of claim 1, wherein the thin film transistor layer comprises a first thin film transistor, a second thin film transistor and a first insulating layer covering the first thin film transistor and the second thin film transistor, the first thin film transistor is connected to the primary anode layer, and the second thin film transistor is connected to the secondary anode layer.
3. The display panel according to claim 2, wherein the pixel defining layer is provided on the first insulating layer, the first thin film transistor includes a first gate electrode, a first source electrode, and a first drain electrode, the second thin film transistor includes a second gate electrode, a second source electrode, and a second drain electrode, the first drain electrode is connected to the primary anode sublayer, and the second drain electrode is connected to the secondary anode sublayer;
the first drain electrode top is equipped with and passes the first via hole of first insulating layer, second drain electrode top is equipped with and passes first insulating layer with the second via hole on pixel definition layer, the main positive pole sublayer passes first via hole with first drain electrode is connected, be equipped with the linkage segment on the pixel definition layer, linkage segment one end with inferior positive pole sublayer is connected, the linkage segment other end passes the second via hole with the second drain electrode is connected.
4. The display panel according to claim 3, wherein the material of the connecting segment is the same as the material of the sub-anode layer, and the connecting segment and the sub-anode layer are of an integral structure.
5. The display panel according to claim 3, wherein a second insulating layer is provided on the connection segment and the pixel defining layer to cover the connection segment, wherein the light emitting function layer includes an organic light emitting layer provided on the primary anode sublayer and the secondary anode sublayer, and a cathode layer provided on the pixel defining layer, the organic light emitting layer, and the second insulating layer to cover the organic light emitting layer and the second insulating layer.
6. The display panel according to claim 2, wherein the display panel comprises an inactive display area between the pixel openings, and the second thin film transistor is disposed in the inactive display area.
7. The display panel according to claim 1, wherein the plurality of pixel openings comprises a plurality of pixel opening groups parallel to each other, each pixel opening group comprises at least two pixel openings, and two adjacent pixel opening groups are:
wherein the positions of the pixel openings in one of the pixel opening groups correspond to the positions of the pixel openings in the other pixel opening group one by one, or
The positions of the pixel openings in one pixel opening group and the positions of the pixel openings in the other pixel opening group are arranged in a staggered mode.
8. The display panel according to claim 1, wherein the plurality of pixel openings at least includes a first pixel opening corresponding to display a first color and a second pixel opening corresponding to display a second color, the sub-anode layer includes a first sub-anode layer disposed in the first pixel opening and a second sub-anode layer disposed in the second pixel opening, the first sub-anode layer is configured to perform driving compensation according to a brightness attenuation characteristic of the first color, and the second sub-anode layer is configured to perform driving compensation according to a brightness attenuation characteristic of the second color.
9. A manufacturing method of a display panel is characterized by comprising the following steps:
providing a substrate, forming a thin film transistor layer on the substrate, wherein the display panel comprises a flat display area and at least one curved display area adjacent to the flat display area, and the part of the display panel located in the flat display area faces a first direction;
forming a pixel definition layer and a light-emitting functional layer on the thin film transistor layer, wherein the pixel definition layer comprises a plurality of pixel openings located in the curved surface display area, each pixel opening comprises an opening bottom and an opening side wall forming a preset inclination angle with the opening bottom, the light-emitting functional layer comprises an anode layer formed above the thin film transistor layer, the anode layer comprises a main anode sublayer and a secondary anode sublayer, the main anode sublayer and the secondary anode sublayer are located in the curved surface display area and arranged at intervals, the main anode sublayer is arranged at the opening bottom, the secondary anode sublayer is arranged on the opening side wall, away from one side of the flat display area, of the pixel opening, the main anode sublayer faces a second direction, the secondary anode sublayer faces a third direction, and an included angle between the third direction and the first direction is smaller than an included angle between the second direction and the first direction, and the secondary anode sublayer is used for carrying out driving compensation according to the brightness attenuation characteristics of corresponding display colors in each pixel opening.
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| CN114784075A (en) * | 2022-04-27 | 2022-07-22 | 武汉天马微电子有限公司 | Display panel, manufacturing method of display panel and display device |
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| KR102464901B1 (en) * | 2016-03-29 | 2022-11-09 | 삼성디스플레이 주식회사 | Flexible Display Device |
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