US-12622096-B2 - Display panel and preparation method thereof

Abstract

The present application provides a display panel and a method for making the display panel. The display panel includes a substrate, a driving circuit layer, multiple light emitting units, and a black matrix layer. The black matrix layer is located between two adjacent light emitting units. The multiple light emitting units are staggered with driving elements, common electrodes and signal lines. A light emitting element emits light towards a quantum dot layer, thereby exciting the quantum dot layer to emit light. The embodiments of the present application provide a full-color display panel emitting light towards the substrate, and improve electrodes of the driving transistor and/or electrodes of the switching transistor.

Inventors

• Zeyao Li
• Haoxuan ZHENG

Assignees

• HKC Corporation Limited

Dates

Publication Date

20260505

Application Date

20231102

Priority Date

20220729

Claims (20)

1. 1 . A display panel, comprising: a substrate; a driving circuit layer disposed on a side of the substrate, wherein the driving circuit layer comprises a plurality of driving elements, a plurality of common electrodes, and a plurality of signal lines; a plurality of light emitting units disposed in an array and on a side of the driving circuit layer away from the substrate, wherein each of the plurality of light emitting units comprises a quantum dot layer and a light emitting element, and the light emitting element comprises a light emitting layer, a first electrode, and a second electrode; and a black matrix layer, disposed on the side of the driving circuit layer away from the substrate, and between adjacent two of the plurality of light emitting units; wherein the plurality of light emitting units are staggered with the plurality of driving elements, the plurality of common electrodes, and the plurality of signal lines; the light emitting element is located on a side of the quantum dot layer away from the substrate; the first electrode and the second electrode are located on a side of the light emitting layer away from the substrate; the black matrix layer defines a plurality of first through holes and a plurality of second through holes, each of the plurality of first through holes extends to the driving circuit layer to expose a corresponding one of the plurality of driving elements, and each of the plurality of second through holes extends to the driving circuit layer to expose a corresponding one of the plurality of common electrodes; and the first electrode is electrically connected to the corresponding one of the plurality of driving elements through a corresponding one of the plurality of first through holes, and the second electrode is electrically connected to the corresponding one of the plurality of common electrodes through a corresponding one of the plurality of second through holes.
2. 2 . The display panel as claimed in claim 1 , wherein the black matrix layer and the plurality of light emitting units are disposed on a surface of the driving circuit layer away from the substrate, and the driving circuit layer is in direct contact with the black matrix layer and the plurality of light emitting units; or the display panel further comprises a planarization layer disposed on the side of the driving circuit layer away from the substrate, and the black matrix layer and the plurality of light emitting units are disposed on a surface of the planarization layer away from the substrate.
3. 3 . The display panel as claimed in claim 1 , wherein a thickness of the black matrix layer is greater than a thickness of each of the plurality of light emitting units, the black matrix layer is configured to cover the plurality of light emitting units, and the black matrix layer further defines a plurality of third through holes and a plurality of fourth through holes, wherein each of the plurality of third through holes is configured to expose the first electrode of the light emitting element of a corresponding one of the plurality of light emitting units, and each of the plurality of fourth through holes is configured to expose the second electrode of the light emitting element of a corresponding one of the plurality of light emitting units; or the thickness of the black matrix layer is less than or equal to the thickness of each of the plurality of light emitting units; the display panel further comprises a first covering layer, and the first covering layer is configured to cover the black matrix layer and the plurality of light emitting units; and the first covering layer defines a plurality of fifth through holes and a plurality of sixth through holes; each of the plurality of fifth through holes is configured to expose the first electrode of the light emitting element of a corresponding one of the plurality of light emitting units, and each of the plurality of sixth through holes is configured to expose the second electrode of the light emitting element of a corresponding one of the plurality of light emitting units, and the plurality of fifth through holes and the plurality of sixth through holes are configured to extend through the first covering layer.
4. 4 . The display panel as claimed in claim 1 , wherein each of the plurality of driving elements comprises a driving transistor disposed on the side of the substrate; the driving transistor at least comprises a first active part, a first gate electrode, a third electrode, and a fourth electrode; the third electrode and the fourth electrode are disposed on a side of the first active part away from the substrate, and the third electrode and the fourth electrode are spaced apart from each other and disposed on two opposite sides of the first active part along a first direction, respectively; and at least one of the third electrode and the fourth electrode is provided with a first protruding part, the first protruding part extends to two opposite sides of the first active part along a second direction perpendicular to the first direction.
5. 5 . The display panel as claimed in claim 4 , wherein each of the third electrode and the fourth electrode is provided with the first protruding part, the first protruding part of the third electrode is staggered with the first protruding part of the fourth electrode, and a projection of the first protruding part of the third electrode on a side surface of the first active part is partially overlapped with a projection of the first protruding part of the fourth electrode on the side surface of the first active part.
6. 6 . The display panel as claimed in claim 4 , wherein each of the plurality of driving elements further comprises a switching transistor disposed on a side of the driving transistor away from the substrate; the switching transistor comprises a second active part, a second gate electrode, a fifth electrode, and a sixth electrode; and the fifth electrode and the sixth electrode are located on a side of the second active part away from the substrate.
7. 7 . The display panel as claimed in claim 6 , wherein the fifth electrode and the sixth electrode are spaced apart from each other and disposed on two opposite sides of the second active part along the first direction, respectively, at least one of the fifth electrode and the sixth electrode is provided with a second protruding part, the second protruding part extends to two opposite sides of the second active part along the second direction perpendicular to the first direction.
8. 8 . The display panel as claimed in claim 6 , wherein the first gate electrode is located on the side of the first active part away from the substrate, and the second gate electrode is located on the side of the second active part close to the substrate.
9. 9 . The display panel as claimed in claim 6 , further comprising a light absorbing layer disposed on a surface of the second active part of the switching transistor of each of the plurality of driving elements close to the substrate.
10. 10 . The display panel as claimed in claim 6 , wherein the switching transistor has a bottom-gate structure.
11. 11 . The display panel as claimed in claim 4 , wherein the driving transistor has a top-gate structure.
12. 12 . The display panel as claimed in claim 4 , wherein the first protruding part is disposed on one side of the third electrode and/or the fourth electrode along the second direction.
13. 13 . The display panel as claimed in claim 1 , wherein the substrate is made of a transparent material.
14. 14 . The display panel as claimed in claim 1 , wherein the light emitting element is a micro light emitting diode configured to emit first light rays.
15. 15 . The display panel as claimed in claim 14 , wherein the quantum dot layer comprises a red quantum dot layer, a green quantum dot layer, and a transparent quantum dot layer; and the quantum dot layer is configured to allow the first light rays to pass therethrough to emit second light rays.
16. 16 . The display panel as claimed in claim 15 , wherein the first light rays are blue light, and the second light rays comprise red light, green light, or blue light.
17. 17 . The display panel as claimed in claim 1 , wherein an area between a surface of the quantum dot layer close to the substrate and the substrate is made of a transparent material.
18. 18 . A method for making a display panel, comprising: forming a driver circuit layer on a substrate, wherein the driving circuit layer comprises a plurality of driving elements, a plurality of common electrodes, and a plurality of signal lines; and disposing a light emitting unit layer on a side of the driving circuit layer away from the substrate, wherein the light emitting unit layer comprises: a plurality of light emitting units disposed in an array, wherein each of the plurality of light emitting units comprises a quantum dot layer and a light emitting element; the light emitting element comprises a light emitting layer, a first electrode, and a second electrode; the plurality of light emitting units is staggered with the plurality of driving elements, the plurality of common electrodes, and the plurality of signal lines; the light emitting element is located on a side of the quantum dot layer away from the substrate; and the first electrode and the second electrode are located on a side of the light emitting layer away from the substrate, and the light emitting element is configured to emit light towards the quantum dot layer to excite the quantum dot layer to emit light; and a black matrix layer located between adjacent two of the plurality of light emitting units, wherein the black matrix layer defines a plurality of first through holes and a plurality of second through holes, each of the plurality of first through holes extends to the driving circuit layer to expose a corresponding one of the plurality of driving elements, and each of the plurality of second through holes extends to the driving circuit layer to expose a corresponding one of the plurality of common electrodes; and the first electrode is electrically connected to the corresponding one of the plurality of driving elements through a corresponding one of the plurality of first through holes, and the second electrode is electrically connected to the corresponding one of the plurality of common electrodes through a corresponding one of the plurality of second through holes.
19. 19 . The method as claimed in claim 18 , wherein each of the plurality of driving elements comprises a driving transistor, the driving transistor at least comprises a first active part, a first gate electrode, a third electrode, and a fourth electrode; the third electrode and the fourth electrode are spaced apart from each other and disposed on two opposite sides of the first active part along a first direction; and a first protruding part is disposed on each of two opposite ends of each of the third electrode and the fourth electrode along a second direction perpendicular to the first direction.
20. 20 . The method as claimed in claim 18 , wherein each of the plurality of driving elements comprises a switching transistor, and the switching transistor comprises a second active part, a second gate electrode, a fifth electrode, and a sixth electrode; the fifth electrode and the sixth electrode are spaced apart from each other and disposed on two opposite sides of the second active part along a first direction; and a second protruding part is disposed on each of two opposite ends of each of the fifth electrode and the sixth electrode along a second direction perpendicular to the first direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is a continuation of International (PCT) Patent Application No. PCT/CN2022/142465 filed on Dec. 27, 2022, which claims priority to Chinese Patent Application No. 202210910571.3, filed on Jul. 29, 2022, the contents of all of which are hereby incorporated by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the technology field of displays, and in particular to a display panel and a method for making the display panel. BACKGROUND Inorganic micro light emitting diode (Micro LED) displays are one of the hotspots in the research field of displays nowadays. Compared with OLED displays, the Micro LEDs have the advantages of high reliability, low power consumption, high brightness, fast response speed, and the like. In the preparation of the Micro LED displays, realizing full-color display of inorganic Micro LED displays has always been an important and urgent research direction. SUMMARY OF THE DISCLOSURE A technical solution adopted by the present disclosure is providing a display panel, and the display panel includes a substrate, a driving circuit layer, a plurality of light emitting units, and a black matrix layer. The driving circuit layer is disposed on a side of the substrate. The driving circuit layer includes a plurality of driving elements, a plurality of common electrodes, and a plurality of signal lines. The plurality of light emitting units are disposed in an array and on a side of the driving circuit layer away from the substrate. Each of the plurality of light emitting units includes a quantum dot layer and a light emitting element. The light emitting element includes a light emitting layer, a first electrode, and a second electrode. The black matrix layer is disposed on the side of the driving circuit layer away from the substrate, and between adjacent two of the plurality of light emitting units. The plurality of light emitting units are staggered with the plurality of driving elements, the plurality of common electrodes, and the plurality of signal lines. The light emitting element is located on a side of the quantum dot layer away from the substrate. The first electrode and the second electrode are located on a side of the light emitting layer away from the substrate, the light emitting element is configured to emit light towards the quantum dot layer to excite the quantum dot layer to emit light. The black matrix layer defines a plurality of first through holes and a plurality of second through holes. Each of the plurality of first through holes extends to the driving circuit layer to expose a corresponding one of the plurality of driving elements, and each of the plurality of second through holes extends to the driving circuit layer to expose a corresponding one of the plurality of common electrodes. The first electrode is electrically connected to the corresponding one of the plurality of driving elements through a corresponding one of the plurality of first through holes, and the second electrode is electrically connected to the corresponding one of the plurality of common electrodes through a corresponding one of the plurality of second through holes. In some embodiments, the black matrix layer and the plurality of light emitting units are directly disposed on a surface of the driving circuit layer away from the substrate. Alternatively, the display panel further includes a planarization layer disposed on the side of the driving circuit layer away from the substrate. The black matrix layer and the plurality of light emitting units are disposed on a surface of the planarization layer away from the substrate. In some embodiments, a thickness of the black matrix layer is greater than a thickness of each of the plurality of light emitting units. The black matrix layer is configured to cover the plurality of light emitting units. The black matrix layer further defines a plurality of third through holes and a plurality of fourth through holes. Each of the plurality of third through holes is configured to expose the first electrode of the light emitting element of a corresponding one of the plurality of light emitting units. Each of the plurality of fourth through holes is configured to expose the second electrode of the light emitting element of a corresponding one of the plurality of light emitting units. Alternatively, the thickness of the black matrix layer is less than or equal to the thickness of each of the plurality of light emitting units. The display panel further includes a first covering layer, and the first covering layer is configured to cover the black matrix layer and the plurality of light emitting units. The first covering layer defines a plurality of fifth through holes and a plurality of sixth through holes. Each of the plurality of fifth through holes is configured to expose the first electrode of the light emitting element of a corresponding one of the plurality of light emitting units.