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EP-4213213-B1 - DISPLAY PANEL AND MANUFACTURING METHOD THEREFOR, AND DISPLAY DEVICE

EP4213213B1EP 4213213 B1EP4213213 B1EP 4213213B1EP-4213213-B1

Inventors

  • HUANG, WEIYUN
  • WU, CHAO
  • LONG, Yue

Dates

Publication Date
20260506
Application Date
20201012

Claims (15)

  1. A display panel, comprising: a base substrate (10); a first insulating layer (20) on a side of the base substrate (10); wherein the first insulating layer (20) comprises a plurality of grooves (21) and a plurality of protrusions (22) on a side of the first insulating layer (20) away from the base substrate (10) and alternately arranged in sequence; each groove (21) comprises a side wall (211) and a bottom surface (212), and each protrusion (22) comprises a top surface (221); and traces (30) on the side of the first insulating layer (20) away from the base substrate (10), wherein the traces (30) comprise first traces (31) and second traces (32), each first trace (31) is on a side of the top surface (221) of the corresponding protrusion (22) away from the base substrate (10), each second trace (32) is on the bottom surface (212) of the corresponding groove (21), and the first traces (31) are disconnected from the second traces (32); characterized in that the display panel further comprises a first display region (b) and a second display region (a) at an outer edge of the first display region (b), wherein the display panel comprises: a plurality of first pixel circuits (11) between the base substrate (10) and the first insulating layer (20) and in the second display region (a); and light emitting devices (40) on a side of the traces (30) away from the base substrate (10) and in the first display region (b), wherein each trace (30) is used for electrically connecting the corresponding first pixel circuit (11) and the corresponding light emitting device (40), so that the first pixel circuit (11) drives the corresponding light emitting device (40) to emit light.
  2. The display panel according to claim 1, wherein an angle (α) between the side wall (211) of each groove (21) and a plane where the bottom surface (212) of the groove (21) is located is in a range from 65° to 90°, and a depth of each groove (21) is in a range from 100 nm to 480 nm; a horizontal distance (d) between the first trace (31) and the second trace (32) adjacent to each other is in a range from 1.8 µm to 2.5 µm; or the plurality of grooves (21) do not penetrate through the first insulating layer (20), and a thickness of the first insulating layer (20) at the bottom surface (212) is in a range from 20 nm to 50 nm.
  3. The display panel according to claim 1 or 2, wherein the display panel further comprises an under-screen functional region, and an orthographic projection of the first display region (b) on the base substrate (10) overlaps with an orthographic projection of the under-screen functional region on the base substrate (10).
  4. The display panel according to claim 1 or 2, further comprising: a second insulating layer (62) on a surface of the first insulating layer (20) away from the base substrate (10) and provided with through holes (621) penetrating through the second insulating layer (62) therein, wherein an orthographic projection of each through hole (621) on the base substrate (10) overlaps with an orthographic projection of the corresponding groove (21) on the base substrate (10), and the first traces (31) are on a surface of the second insulating layer (62) away from the base substrate (10).
  5. The display panel according to claim 4, wherein an angle (β) between a side wall (211) of each through hole (621) and a plane where the second insulating layer (62) is located is an obtuse angle; the second insulating layer (62) has a thickness in a range from 150 nm to 500 nm; or materials of the first insulating layer (20) and the second insulating layer (62) are different from each other.
  6. The display panel according to claim 5, wherein the material of the first insulating layer (20) comprises silicon nitride, and the material of the second insulating layer (62) comprises silicon oxide.
  7. The display panel according to claim 1 or 2, further comprising: a third insulating layer (63) on a surface of the first insulating layer (20) close to the base substrate (10), wherein an orthographic projection of the first insulating layer (20) on the base substrate (10) covers an orthographic projection of the third insulating layer (63) on the base substrate (10), and the orthographic projection of the third insulating layer (63) on the base substrate (10) does not overlap with an orthographic projection of each groove (21) on the base substrate (10) to have a non-overlapping region therebetween.
  8. The display panel according to claim 1 or 2, further comprising: a fourth insulating layer (64) on a surface of the first insulating layer (20) close to the base substrate (10), wherein an orthographic projection of the fourth insulating layer (64) on the base substrate (10) covers an orthographic projection of each groove (21) on the base substrate (10).
  9. The display panel according to claim 8, wherein the plurality of grooves (21) penetrate through the first insulating layer (20), and the second traces (32) are on a surface of the fourth insulating layer (64) exposed by the plurality of grooves (21).
  10. The display panel according to claim 9, wherein the fourth insulating layer (64) comprises concave portions (641) therein, an orthographic projection of each groove (21) on the base substrate (10) overlaps with an orthographic projection of the corresponding concave portion (641) on the base substrate (10); each second trace (32) is on a bottom surface of the corresponding concave portion (641).
  11. A method for manufacturing a display panel, comprising: providing a base substrate (10); forming a first original insulating layer (200) on a side of the base substrate (10); etching the first original insulating layer (200) to obtain a first insulating layer (20) comprising a plurality of grooves (21) and a plurality of protrusions (22) alternately arranged in sequence, wherein each groove (21) comprises a side wall (211) and a bottom surface (212), and each protrusion (22) comprises a top surface (221); and forming traces (30) on a side of the first insulating layer (20) away from the base substrate (10), wherein the traces (30) comprise first traces (31) and second traces (32), each first trace (31) is on a side of the top surface (221) of the corresponding protrusion (22) away from the base substrate (10), each second trace (32) is on the bottom surface (212) of the corresponding groove (21), and the first traces (31) are disconnected from the second traces (32); and characterized in that the display panel comprises a first display region (b) and a second display region (a) disposed at an outer edge of the first display region (b), and wherein the method for manufacturing the display panel comprises: forming a plurality of first pixel circuits (11) on a surface of the base substrate (10) and located in the second display region (a); forming the first insulating layer (20) on a side of the plurality of first pixel circuits (11) away from the base substrate (10); forming the traces (30) on a side of the first insulating layer (20) away from the base substrate (10) by a deposition process; and forming light emitting devices (40) on a side of the traces (30) away from the base substrate (10) and located in the first display region (b), wherein each trace (30) is used for electrically connecting the corresponding first pixel circuit (11) and the corresponding light emitting device (40), so that the first pixel circuit (11) drives the corresponding light emitting device (40) to emit light.
  12. The method according to claim 11, wherein the etching the first original insulating layer (200) to obtain the first insulating layer (20), comprises: forming a whole photoresist layer (70) on a surface of the first original insulating layer (200); performing an exposure process and a development process on a predetermined region of the whole photoresist layer (70), to obtain a photoresist layer (71) having openings (72) therein; and performing an etching process on a part of the first original insulating layer (200) exposed by the openings (72) by using an etching gas, to obtain the first insulating layer (20), wherein an exposure amount in the exposure process is in a range from 100 mJ to 160 mJ, and a development time in the development is in a range from 40s to 80s; and/or an etching rate in the etching process is in a range from 2500A/min to 3500A/min.
  13. The method according to claim 12, comprising: forming a second original insulating layer (620) on a surface of the first original insulating layer (200) away from the base substrate (10); forming a whole photoresist layer (70) on a surface of the second original insulating layer (620); exposing and developing a predetermined region of the whole photoresist layer (70), to obtain a photoresist layer (71) having openings (72) therein; and etching the second original insulating layer (620) and the first original insulating layer (200) exposed by the openings (72) by using an etching gas, to obtain the second insulating layer (62) provided with the through holes (621) therein and the first insulating layer (20) provided with the plurality of grooves (21) therein, wherein an orthographic projection of each through hole (621) on the base substrate (10) overlaps with an orthographic projection of the corresponding groove (21) on the base substrate (10), and the first traces (31) are disposed on the surface of the second insulating layer (62) away from the base substrate (10).
  14. The method according to claim 11, wherein prior to the forming the first original insulating layer (200), the method further comprises: forming a third original insulating layer (630); and etching the third original insulating layer (630) to obtain a patterned third insulating layer (63); wherein an orthographic projection of the first insulating layer (20) on the base substrate (10) covers an orthographic projection of the third insulating layer (63) on the base substrate (10), and the orthographic projection of the third insulating layer (63) on the base substrate (10) does not overlap with an orthographic projection of each groove (21) on the base substrate (10) to have a non-overlapping region therebetween; or the method further comprises forming a fourth original insulating layer (640) before the forming the first original insulating layer (200), wherein the first original insulating layer (200) is formed on a surface of the fourth original insulating layer (640) away from the base substrate (10); and etching the first original insulating layer (200) and the fourth original insulating layer (640), to obtain the first insulating layer (20) provided with the plurality of grooves (21) therein and the fourth insulating layer (64) provided with the concave portions (641) therein, wherein the plurality of grooves (21) penetrate through the first insulating layer (20), an orthographic projection of each groove (21) on the base substrate (10) overlaps with an orthographic projection of the corresponding concave portion (641) on the base substrate (10), and each second trace (32) is formed on a bottom surface of the corresponding concave portion (641).
  15. A display apparatus, comprising: the display panel according to any one of claims 1 to 10, which comprises a first display region (b) and a second display region (a); wherein the display panel comprises an under-screen functional region, and an orthographic projection of the under-screen functional region on the display panel overlaps with an orthographic projection of the first display region (b) on the display panel.

Description

TECHNICAL FIELD The present disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing a display panel, and a display apparatus. BACKGROUND At present, a display apparatus, such as a mobile phone, has more and more functions, and has higher and higher requirements on a screen-to-body ratio and other parameters of a display panel, so that traces in the display panel are designed to more and more complex, and the number of the traces is greater. Therefore, it is particularly important in the manufacturing of the display panel to provide a great number of traces in a limited space. US patent application US2019363153A1 discloses a display device including a TFT layer provided in a display area, a bending section and a terminal in a non-active area, and a terminal wiring line that connects to the terminal through the bending section, and the terminal wiring line includes a first wiring line and a second wiring line each positioned on both sides of the bending section and a third wiring line that passes through the bending section and is electrically connected with each of the first wiring line and the second wiring line and curved so as to have recesses and protrusions. US patent application US2020273944A1 discloses a display apparatus including: a substrate having a bending area between a first area and a second area; an inorganic insulating layer arranged on the substrate, the inorganic insulating layer having an opening or a groove corresponding to the bending area; a wiring unit extending to the second area through the bending area, the wiring unit arranged on the inorganic insulating layer and at least a portion thereof overlapping the opening or the groove; and an organic material layer between the inorganic insulating layer and the wiring unit, the organic material layer configured to fill the opening or the groove. Therefore, research on the display panel should be well developed. SUMMARY The present disclosure is directed to solving, at least in part, one of the technical problems in the related art. Therefore, an object of the present disclosure is to provide a display panel, where a distance between two adjacent traces is small, and more traces can be more reasonably arranged in a limited space, so as to meet the use requirements. In one aspect of the present disclosure, the present disclosure provides a display panel. According to the invention, the display panel includes: a base substrate; a first insulating layer on a side of the base substrate; wherein the first insulating layer includes a plurality of grooves and a plurality of protrusions on a side of the first insulating layer away from the base substrate and alternately arranged in sequence; each groove includes a side wall and a bottom surface, and each protrusion includes a top surface; and traces on the side of the first insulating layer away from the base substrate, wherein the traces include first traces and second traces, each first trace is on a side of the top surface of the corresponding protrusion away from the base substrate, each second trace is on the bottom surface of the corresponding groove, and the first traces are disconnected from the second traces. That is, the first traces are not connected to the second traces. Therefore, the first traces and the second traces are respectively arranged on the top surfaces of the protrusions and the bottom surfaces of the grooves of the first insulating layer; the first traces are disconnected from the second traces due to the existence of the step by providing the grooves. Compared with the case that the first traces and the second traces are arranged in the same plane (namely, the first insulating layer is not provided with the grooves, the first traces and the second traces are both arranged on the same flat surface of the first insulating layer), the horizontal distance between the first trace and the second trace adjacent to each other can be greatly reduced, and further, more number of the traces can be arranged in the same size range. According to the invention, the display panel includes a first display region and a second display region at an outer edge of the first display region, wherein the display panel includes: a plurality of first pixel circuits between the base substrate and the first insulating layer and in the second display region; and light emitting devices on a side of the traces away from the base substrate and in the first display region, wherein each trace is used for electrically connecting the corresponding first pixel circuit and the corresponding light emitting device, so that the first pixel circuit drives the corresponding light emitting device to emit light. According to an embodiment of the present disclosure, an angle between the side wall of each groove and a plane where the bottom surface of the groove is located is in a range from 65° to 90°, and a depth of each groove is in a range from 100 n