CN117479570A

CN117479570A - Display panel

Info

Publication number: CN117479570A
Application number: CN202310335487.8A
Authority: CN
Inventors: 严杭
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2024-01-30

Abstract

The embodiment of the application discloses a display panel, wherein a first concave part is formed by overlapping a first groove with a signal line so that a part of an anode covers the first groove according to potential, and a luminous pixel is arranged in the first concave part, so that the total reflection effect of light in the luminous pixel is reduced, the light extraction rate is improved, and the risk of forming a bulge on the anode is avoided; in addition, in the region of the same luminescent pixel, the orthographic projection patterns of all the first grooves on the substrate are symmetrical patterns about the center of the luminescent pixel, so that the risk of asymmetric viewing angles of the display panel is reduced.

Description

Display panel

Technical Field

The application relates to the technical field of display, in particular to a display panel.

Background

There are many types of electroluminescent panels, such as organic light emitting diode panels, on the market. Due to the requirements of high aperture ratio and high resolution, some organic light emitting diode panels need to have data lines arranged right below pixels, but the arrangement is such that the area of the anode right opposite to the data lines is raised, and uneven anode results in the risk of asymmetric viewing angle of the organic light emitting diode panel, so that the display effect is poor.

Disclosure of Invention

The embodiment of the application provides a display panel, which can improve the light emitting efficiency of the display panel while reducing the risk of asymmetric viewing angles of the display panel.

The embodiment of the application provides a display panel, which comprises:

a substrate;

a signal line disposed on the substrate;

an insulating layer unit covering the signal line and the substrate, the insulating layer unit including at least a first groove;

the anode is arranged on the insulating layer unit, and part of the anode covers the at least one first groove to form at least one first concave part;

a pixel defining layer disposed on the insulating layer unit, the pixel defining layer having an opening exposing the anode disposed thereon; and

a light emitting pixel disposed within the opening and covering the at least one first recess;

in the pattern of the orthographic projection direction of the substrate, the signal line and the light emitting pixel are partially overlapped, one first groove is completely overlapped in the area of the signal line corresponding to the light emitting pixel, and at least one first groove forms a central symmetrical pattern based on the central setting of the light emitting pixel in the same area of the light emitting pixel.

Optionally, in some embodiments of the present application, in the pattern of the orthographic projection direction of the substrate, the light emitting pixel has a first length in an extending direction perpendicular to the signal line, and the at least one first groove is equally divided into the first lengths.

Optionally, in some embodiments of the present application, the insulating layer unit includes at least one second groove;

in the pattern of the orthographic projection direction of the substrate, the extending direction of the second groove is perpendicular to the extending direction of the first groove, and the pattern of the at least one second groove is a symmetrical pattern about the center of the light emitting pixel.

Optionally, in some embodiments of the present application, the light emitting pixel has a second length in a direction parallel to an extending direction of the signal line, and the at least one second groove divides the second length equally.

Optionally, in some embodiments of the present application, a width of the first groove is greater than a width of the corresponding signal line.

Optionally, in some embodiments of the present application, the depth of the first groove is equal to the depth of the second groove, and the width of the first groove is equal to the width of the second groove.

Optionally, in some embodiments of the present application, in the orthographic projection pattern of the substrate, a central axis of the signal line passes through a center of the light emitting pixel, and a central axis of the first groove and the signal line coincide; the central axis of the second groove is perpendicular to the central axis of the first groove and passes through the center of the luminous pixel.

Optionally, in some embodiments of the present application, in the orthographic projection pattern of the substrate, a central axis of the signal line is located outside a center of the light emitting pixel, a central axis of one first groove coincides with a central axis of the signal line, and central axes of a plurality of first grooves are equidistant and arranged in parallel; the central axis of the second groove is perpendicular to the central axis of the first groove, and the central axes of the second grooves are equidistant and parallel.

Optionally, in some embodiments of the present application, in the orthographic projection pattern of the substrate, a central axis of the signal line is located outside a center of the light emitting pixel, and a central axis of the first groove coincides with the central axis of the light emitting pixel; the central axis of the second groove is perpendicular to the central axis of the first groove and passes through the center of the luminous pixel.

Optionally, in some embodiments of the present application, the insulating layer unit is a single film layer structure.

Optionally, in some embodiments of the present application, the insulating layer unit includes a first flat layer and a second flat layer, where the first flat layer covers the signal line, and the first flat layer is provided with a first concave structure; in the orthographic projection direction of the substrate, one first concave structure extends and overlaps the signal line;

the second flat layer is covered on the first flat layer, and part of the second flat layer extends to cover the first concave structure to form the first groove.

Optionally, in some embodiments of the present application, the signal line includes one of a scan line or a data line.

Optionally, in some embodiments of the present application, a thickness of the second planar layer is less than a depth of the first recessed feature.

Optionally, in some embodiments of the present application, the insulating layer unit includes a first flat layer and a second flat layer, the first flat layer covers the signal line, the second flat layer covers the first flat layer, the second flat layer is provided with the first groove, and a thickness of the second flat layer is not less than a depth of the first groove.

Optionally, in some embodiments of the present application, the pattern of light emitting pixels includes at least one of a circle, an ellipse, or a polygon.

The display panel comprises a substrate, a signal wire, an insulating layer unit, an anode, a pixel definition layer and a luminescent pixel, wherein the signal wire is arranged on the substrate; the insulating layer unit covers the signal wire and the substrate and comprises at least one first groove; the anode is arranged on the insulating layer unit, and part of the anode covers at least one first groove to form at least one first concave part; the pixel definition layer is arranged on the insulating layer unit, and an opening exposing the anode is arranged on the pixel definition layer; the light-emitting pixels are arranged in the openings and cover at least one first concave part; in the orthographic projection direction of the substrate, the signal line and the light-emitting pixel are partially overlapped, one first groove is completely overlapped in the area of the signal line corresponding to the light-emitting pixel, and at least one first groove forms a central symmetrical pattern based on the central arrangement of the light-emitting pixel in the same area of the light-emitting pixel.

According to the embodiment of the application, the first concave part is formed by overlapping the first groove on the signal line so that the first groove is covered by the part of the anode according to the potential, and the luminous pixels are arranged in the first concave part, so that the total reflection effect of light in the luminous pixels is reduced, the light extraction rate is improved, and the risk of forming bulges on the anode is avoided; in addition, in the region of the same luminescent pixel, the orthographic projection patterns of all the first grooves on the substrate are symmetrical patterns about the center of the luminescent pixel, so that the risk of asymmetric viewing angles of the display panel is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a display panel according to a first embodiment of the present application;

FIG. 2 is an enlarged view of portion M of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line AB of FIG. 2;

fig. 4 is a schematic structural view of a display panel according to the first embodiment of the present application with square pixels;

fig. 5 is a schematic structural diagram of a display panel according to the first embodiment of the present application with rectangular pixels;

fig. 6 is a schematic structural view of a display panel having oval-shaped light emitting pixels according to the first embodiment of the present application;

fig. 7 is a schematic structural diagram of a display panel according to a second embodiment of the present application;

fig. 8 is an enlarged view of the portion N of fig. 7;

fig. 9 is another structure of an enlarged view of the portion N in fig. 7;

FIG. 10 is a schematic cross-sectional view taken along line CD in FIG. 8;

fig. 11 is a schematic structural view of a display panel provided in the present application based on the second embodiment, the display panel having square light emitting pixels;

fig. 12 is a schematic structural diagram of a display panel according to a second embodiment of the present application having rectangular pixels;

fig. 13 is a schematic structural view of a display panel according to the second embodiment of the present application with oval-shaped pixels.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.

The embodiment of the application provides a display panel, which is characterized in that a first concave part is formed by overlapping a first groove with a signal line so that part of an anode covers the first groove according to potential, and a luminous pixel is arranged in the first concave part, so that the total reflection effect of light in the luminous pixel is reduced, the light extraction rate is improved, and the risk of forming a bulge on the anode is avoided; in addition, in the region of the same luminescent pixel, the orthographic projection patterns of all the first grooves on the substrate are symmetrical patterns about the center of the luminescent pixel, so that the risk of asymmetric viewing angles of the display panel is reduced.

When the number of the first grooves is an odd number, in the pattern in the orthographic projection direction of the substrate, only one first groove passes through the center of the light-emitting pixel; when the number of the first grooves is even, in the pattern in the orthographic projection direction of the substrate, all the first grooves are located outside the center of the light emitting pixel, that is, all the first grooves do not pass through the center of the light emitting pixel.

The following is a detailed description. The following description of the embodiments is not intended to limit the preferred embodiments.

Referring to fig. 1 to 3, a first embodiment of the present application provides a display panel 100, which includes a substrate 11, a signal line 12, an insulating layer unit 13, an anode 14, a pixel defining layer 15, and a light emitting pixel 16. The signal line 12 is provided on the substrate 11. The insulating layer unit 13 covers the signal line 12 and the substrate 11. The insulating layer unit 13 includes at least one first groove 13a. The anode 14 is disposed on the insulating layer unit 13. Part of the anode 14 covers the at least one first groove 13a to form at least one first undercut 141. The pixel defining layer 15 is disposed on the insulating layer unit 13. The pixel defining layer 15 is provided with an opening 151 exposing the anode 14. The light emitting pixels 16 are disposed in the openings 151 and cover the at least one first concave portion 141.

In the pattern of the substrate 11 in the orthographic projection direction, the signal line and the light emitting pixel are partially overlapped, a first groove 13a is completely overlapped on the area of the signal line 12 corresponding to the light emitting pixel, and in the area of the same light emitting pixel 16, at least one first groove 13a forms a central symmetrical pattern based on the central arrangement of the light emitting pixel 16.

It should be noted that, the pattern of at least one first groove 13a refers to the pattern formed by all the first grooves 13a in the area of a single light emitting pixel 16; and the pattern is a symmetrical pattern about the center of the light emitting pixel 16.

The display panel 100 of the present application forms the first concave portion 141 by overlapping the first concave portion 13a with the signal line 12 so that a portion of the anode 14 covers the first concave portion 13a. The light emitting pixels 16 are disposed in the first concave portions 141, which reduces the total reflection effect of light in the light emitting pixels 16, improves the light extraction rate, and avoids the risk of the anode 14 forming a bump; in addition, in the area of the same pixel 16, the front projection pattern of all the first grooves 13a on the substrate 11 is symmetrical about the center of the pixel 16, so as to reduce the risk of asymmetric viewing angles of the display panel 100.

Among them, viewing angle symmetry may include symmetry of luminance viewing angle and symmetry of chrominance viewing angle.

Optionally, the display panel 100 further includes a thin film transistor, a capacitor, a power line, and the like formed on the substrate 11.

Optionally, the insulating layer unit 13 is further provided with a via hole, and the via hole corresponds to the outer side of the light emitting pixel 16 and is located in the corner area of the anode 14, so that the concave portion of the light emitting pixel 16 corresponding to the via hole is avoided, and the symmetry of the viewing angle is improved. The anode 14 is connected to the source or drain of the thin film transistor through the via hole.

Alternatively, the pattern of anode 14 may correspond to a pattern similar to that of pixel 16 except for the regions at the vias.

Optionally, the signal line 12 includes one of a scan line or a data line. That is, the scan lines or data lines traverse under the light emitting pixels 16. The embodiments of the present application are described by taking the data line as an example, but are not limited thereto.

Alternatively, the light emitting pixel 16 may include a light emitting layer, and the material of the light emitting layer may be an organic material, such as Alq3, bis (2-methyl-8-hydroxyquinoline-N1, O8) - (1, 1' -biphenyl-4-hydroxy) aluminum (BAlq), DPVBi, almq3, 3-t-butyl-9, 10-bis (2-naphthalene) anthracene (TBADN).

The material of the light emitting layer may also be an inorganic material, such as one or more selected from group IV semiconductor nanocrystals, group II-V semiconductor nanocrystals, group II-VI semiconductor nanocrystals, group IV-VI semiconductor nanocrystals, group III-V semiconductor nanocrystals, group III-VI semiconductor nanocrystals, and the like. By way of example, one or more of silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, indium arsenide quantum dots, gallium nitride quantum dots, and the like may be used.

In some embodiments, the light emitting pixel 16 may be a stacked structure of a hole transporting layer, a hole injecting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer.

Optionally, the display panel 100 further comprises a cathode 17 arranged on the luminescent pixel 16. The cathode covering pixel 16 forms at least one cathode recess corresponding to the first groove 13a. The cathode recess breaks the path of total reflection of light within the light emitting pixel 16, thereby improving the light extraction rate.

Alternatively, the width of the first groove 13a is larger than the width of the corresponding signal line 12. The width of the first groove 13a is larger than that of the signal line 12, so that the first groove 13a is ensured to cover the signal line 12 sufficiently, and the phenomenon that the anode is raised due to topography is further ensured to be eliminated.

Alternatively, in the pattern of the orthographic projection direction of the substrate 11, the light emitting pixels 16 have a first length in the extending direction perpendicular to the signal lines 12, and at least one first groove 13a equally divides the first length.

It should be noted that, the at least one first groove 13a refers to all first grooves 13a located in a single light emitting pixel 16, for example, 2 first grooves 13a are located in a single light emitting pixel 16 area, and then the central axes of the two first grooves 13a are equal to the first length.

Wherein the more the first length is equally divided, the better the light extraction effect, the better the symmetry of the viewing angle in the direction perpendicular to the direction in which the signal line 12 extends.

Optionally, the insulating layer unit 13 includes at least one second groove 13b. In the pattern of the orthographic projection direction of the substrate 11, the extending direction of the second groove 13b is perpendicular to the extending direction of the first groove 13a, and the pattern of at least one second groove 13b is a symmetrical pattern about the center of the light emitting pixel 16.

Optionally, in some embodiments, the pattern of the second grooves 13b may be slightly offset from the position of the central symmetrical pattern of the pixels 16, and the depth and width of the second grooves 13b may be fine-tuned based on the width and depth of the first grooves 13a, so as to more precisely regulate the viewing angle symmetry.

The anode 14 covers the second groove 13b, and a second concave portion is formed at the second groove 13b. The light emitting pixels 16 cover the second concave recesses. The cathode 17 is formed with a cathode recess portion at a position corresponding to the second groove 13b.

In the extending direction parallel to the signal line 12, symmetry with respect to viewing angle is improved; meanwhile, due to the arrangement of the second grooves 13b, the anode 14 and the cathode 17 are recessed, and the light extraction rate of the light-emitting pixels 16 is improved.

Optionally, in the extending direction parallel to the signal line 12, the light emitting pixel 16 has a second length, and the at least one second groove 13b is equally divided by the second length.

Wherein the more the second length is equally divided, the better the light extraction effect, the better the symmetry of the viewing angle in the direction extending parallel to the signal line 12.

Alternatively, the depth of the first groove 13a is equal to the depth of the second groove 13b. The width of the first groove 13a is equal to the width of the second groove 13b. The depth and width of the first groove 13a and the second groove 13b are equal, and in the case of central symmetry, the uniformity of light emission and the symmetry of viewing angle of the whole light emitting pixel 16 are better.

Optionally, in the orthographic projection pattern of the substrate 11, the central axis of the signal line 12 passes through the center of the light emitting pixel 16, and a first groove 13a coincides with the central axis of the signal line 12. The central axis of a second groove 13b is perpendicular to the central axis of the first groove 13a and passes through the center of the light emitting pixel 16.

Since the signal line 12 passes through the center of the light emitting pixel 16, the odd-numbered first grooves 13a and the odd-numbered second grooves 13b may be provided to divide the light emitting pixel 16 and ensure viewing angle symmetry. For example, the pixels 16 are divided by a first groove 13a and a second groove 13b.

Of course, in some embodiments, a plurality of first grooves 13a and second grooves 13b may be provided to divide the light emitting pixels 16, so as to further improve the viewing angle symmetry and the light extraction effect.

Optionally, the insulating layer unit 13 includes a first flat layer 131 and a second flat layer 132, where the first flat layer 131 covers the signal line 12, and the first flat layer 131 is provided with a first recess structure. In the orthographic projection direction of the substrate 11, a first concave structure extends and overlaps the signal line 12.

The second flat layer 132 covers the first flat layer 131, and a portion of the second flat layer 132 extends to cover the first recess structure to form the first groove 13a.

The insulating layer unit 13 is formed by two flat layers in the embodiment due to the influence of the process difficulty of the maximum thickness of the film layer, so that the process difficulty can be reduced.

In some embodiments, the insulating layer unit 13 is a single-film structure.

Optionally, the thickness of the second flat layer 132 is less than the depth of the first recessed structures. Since the planarization layer has fluidity during the manufacturing process, the thickness of the second planarization layer 132 is small, so that the second planarization layer 132 can be ensured not to completely fill the first recess structure, that is, the first groove 13a is ensured to be formed.

Optionally, in some embodiments, the second flat layer 132 covers the first flat layer 131, and the second flat layer 132 is provided with the first groove 13a. The thickness of the second flat layer 132 is not less than the depth of the first groove 13a, or the thickness of the second flat layer 132 is less than the depth of the first groove 13a, i.e., the first groove 13a extends into the first flat layer 131.

Alternatively, the pattern of light emitting pixels 16 includes at least one of a circle, an ellipse, or a polygon. Alternatively, the polygon may be square, rectangle, diamond, triangle, pentagon, or the like.

The present first embodiment takes the pattern of the light emitting pixels 16 as a circle as an example. In some embodiments, the pattern of the light emitting pixels 16 may also be square as shown in fig. 4, with the data lines passing through the diagonal of the light emitting pixels 16, rectangular as shown in fig. 5, and oval as shown in fig. 6. Alternatively, in fig. 6, the major axis of the elliptical light emitting pixel 16 forms an angle of 45 degrees with the extending direction of the signal line 12. The elliptical light emitting pixels 16 are inclined by 45 degrees, so that the display effect is improved and the symmetry of the viewing angle is improved.

Referring to fig. 7 to 8, the display panel 100 of the second embodiment is different from the first embodiment in that: in the orthographic projection pattern of the substrate 11, the central axis of the signal line 12 is located outside the center of the light emitting pixel 16, and the central axis of one first groove 13a coincides with the central axis of the signal line 12. The central axes of the first grooves 13a are equidistant and arranged in parallel. The central axes of the second grooves 13b are perpendicular to the central axes of the first grooves 13a, and the central axes of the plurality of second grooves 13b are equidistant and arranged in parallel.

That is, in the second embodiment, the signal line 12 is also taken as a data line, and the pattern of the light emitting pixels 16 is exemplified by a circle. The present embodiment adaptively adjusts the positions of the first groove 13a and the second groove 13b according to the condition that the signal line 12 crosses the light emitting pixel 16.

Since the signal line 12 does not pass through the center of the light emitting pixel 16, the display panel 100 of the present second embodiment requires an even number of first grooves 13a in order to improve viewing angle symmetry in a direction perpendicular to the extending direction of the signal line 12; in parallel to the extending direction of the signal lines 12, an even number of the second grooves 13b are provided to satisfy the viewing angle.

Referring to fig. 9, in the front projection pattern of the substrate 11, the central axis of the signal line 12 is located outside the center of the light emitting pixel 16, and the central axis of the first groove 13a passes through the center of the light emitting pixel 16 and coincides with the central axis of the light emitting pixel 16, so that the first groove 13a covers the signal line 12.

The central axis of the second groove 13b is perpendicular to the central axis of the first groove 13a and passes through the center of the light emitting pixel 16. Compared with the pattern in fig. 8, the embodiment only needs to provide a wider first groove 13a and second groove 13b to improve the symmetry of the viewing angle and reduce the process difficulty.

Referring to fig. 10, a second embodiment of the present application provides a display panel 100, which includes a substrate 11, a signal line 12, an insulating layer unit 13, an anode 14, a pixel defining layer 15, and a light emitting pixel 16. The signal line 12 is provided on the substrate 11. The insulating layer unit 13 covers the signal line 12 and the substrate 11. The insulating layer unit 13 is provided with at least one first groove 13a. The anode 14 is disposed on the insulating layer unit 13. Part of the anode 14 covers the at least one first groove 13a to form at least one first undercut 141. The pixel defining layer 15 is disposed on the insulating layer unit 13. The pixel defining layer 15 is provided with an opening 151 exposing the anode 14. The light emitting pixels 16 are disposed in the openings 151 and cover the at least one first concave portion 141.

In the pattern of the orthographic projection direction of the substrate 11, a first groove 13a extends and overlaps the signal line 12, and in the area of the same light emitting pixel 16, at least one first groove 13a forms a central symmetrical pattern based on the central arrangement of the light emitting pixel 16.

In some embodiments, the pattern of the light emitting pixels 16 may also be square as shown in fig. 11, with the data lines passing through the diagonal of the light emitting pixels 16, rectangular as shown in fig. 12, and oval as shown in fig. 13.

The foregoing has described in detail a display panel provided by embodiments of the present application, and specific examples have been set forth herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the methods of the present application and their core ideas; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A display panel, comprising:

a substrate;

a signal line disposed on the substrate;

an insulating layer unit covering the signal line and the substrate, the insulating layer unit including: at least one first groove;

2. The display panel according to claim 1, wherein the insulating layer unit further comprises: at least one second groove;

3. The display panel according to claim 1 or 2, wherein a width of the first groove is larger than a width of the corresponding signal line.

4. The display panel of claim 2, wherein a depth of the first groove is equal to a depth of the second groove, and a width of the first groove is equal to a width of the second groove.

5. The display panel according to claim 2, wherein in the orthographic projection pattern of the substrate, a central axis of the signal line passes through a center of the light emitting pixel, and a central axis of the first groove and the signal line coincide; the central axis of the second groove is perpendicular to the central axis of the first groove and passes through the center of the luminous pixel.

6. The display panel according to claim 2, wherein in the orthographic projection pattern of the substrate, the central axis of the signal line is located outside the center of the light emitting pixel, the central axis of one first groove coincides with the central axis of the signal line, and the central axes of a plurality of first grooves are equidistant and arranged in parallel; the central axis of the second groove is perpendicular to the central axis of the first groove, and the central axes of the second grooves are equidistant and parallel.

7. The display panel according to claim 2, wherein in the orthographic projection pattern of the substrate, a central axis of the signal line is located outside a center of the light emitting pixel, and a central axis of the first groove coincides with the central axis of the light emitting pixel; the central axis of the second groove is perpendicular to the central axis of the first groove and passes through the center of the luminous pixel.

8. The display panel according to claim 1 or 2, wherein the insulating layer unit is a single film layer structure.

9. The display panel according to claim 1 or 2, wherein the insulating layer unit includes a first flat layer and a second flat layer, the first flat layer covering the signal line, the first flat layer being provided with a first recess structure; in the orthographic projection direction of the substrate, one first concave structure extends and overlaps the signal line;

10. The display panel according to claim 1 or 2, wherein the insulating layer unit includes a first flat layer covering the signal line and a second flat layer covering the first flat layer, the second flat layer being provided with the first groove, and a thickness of the second flat layer being not less than a depth of the first groove.