Display panel and manufacturing method thereof, display device

Patent metadata

Field	Value
Publication number	US-2021193766-A1
Application number	US-201916642093-A
Country	US
Kind code	A1
Filing date	Jul 31, 2019
Priority date	Jan 29, 2019
Publication date	Jun 24, 2021
Grant date	—

Abstract

A display panel and a manufacturing method thereof, and a display device are provided. The display panel includes a base substrate and a plurality of sub-pixels disposed on the base substrate, the plurality of sub-pixels constitute a plurality of repeating units, and each of the plurality of repeating units includes a sub-pixel of first color, two sub-pixels of second color, and a sub-pixel of third color, each of the plurality of sub-pixels includes a driving transistor, and the light emitting element includes a first electrode layer, a light emitting layer, and a second electrode layer; an orthographic projection of the first electrode layer of the light emitting element in each sub-pixel of second color on the base substrate at least partially overlaps with an orthographic projection of a gate electrode of the driving transistor in each sub-pixel of second color on the base substrate.

First claim

1 . A display panel, comprising: a base substrate and a plurality of sub-pixels disposed on the base substrate, wherein the plurality of sub-pixels constitute a plurality of repeating units, each of the plurality of repeating units comprises a sub-pixel of first color, two sub-pixels of second color, and a sub-pixel of third color;
each of the plurality of sub-pixels comprises a driving transistor and a light emitting element electrically connected to the driving transistor, and the light emitting element comprises a first electrode layer, a light emitting layer, and a second electrode layer; an orthographic projection of the first electrode layer of the light emitting element in each sub-pixel of second color on the base substrate at least partially overlaps with an orthographic projection of a gate electrode of the driving transistor in each sub-pixel of second color on the base substrate.

2 . The display panel according to claim 1 , wherein the orthographic projection of the gate electrode of the driving transistor in each sub-pixel of second color on the base substrate is within the orthographic projection of the first electrode layer of the light emitting element in each sub-pixel of second color on the base substrate.

3 . The display panel according to claim 1 , wherein each of the plurality of sub-pixels comprises a pixel circuit, and the pixel circuit comprises the driving transistor,
the orthographic projection of the first electrode layer of the light emitting element in a first one of the two sub-pixels of second color on the base substrate at least partially overlaps with an orthographic projection of the pixel circuit in a second one of the two sub-pixels of second color on the base substrate; the orthographic projection of the first electrode layer of the light emitting element in the second sub-pixel of second color on the base substrate does not overlap with the orthographic projection of the pixel circuit in the first sub-pixel of second color on the base substrate.

4 . The display panel according to claim 3 , wherein a shape of the first electrode layer of the light emitting element in the first sub-pixel of second color is different from a shape of the first electrode layer of the light emitting element in the second sub-pixel of second color.

5 . The display panel according to claim 4 , wherein the first electrode layer of the light emitting element in the first sub-pixel of second color comprises: a first driving electrode block and an auxiliary electrode block connected to the first driving electrode block;
an orthographic projection of the first driving electrode block on the base substrate does not overlap with the orthographic projection of the gate electrode of the driving transistor in the first sub-pixel of second color on the base substrate; and an orthographic projection of the auxiliary electrode block on the base substrate at least partially overlaps with the orthographic projection of the gate electrode of the driving transistor in the first sub-pixel of second color on the base substrate.

6 . The display panel according to claim 5 , wherein a ratio of an area of a first projection overlap region of the auxiliary electrode block to an area of a second projection overlap region of the first electrode layer of the light emitting element in the second sub-pixel of second color is within a ratio range;
the first projection overlap region is an overlap region between the orthographic projection of the auxiliary electrode block on the base substrate and the orthographic projection of the gate electrode of the driving transistor in the first sub-pixel of second color on the base substrate, the second projection overlap region is an overlap region between the orthographic projection of the first electrode layer of the light emitting element in the second sub-pixel of second color on the base substrate and the orthographic projection of the gate electrode of the driving transistor in the second sub-pixel of second color on the base substrate, and the ratio range is from 90 percent to 110 percent.

7 . The display panel according to claim 5 , wherein the first electrode layer of the light emitting element in the second sub-pixel of second color comprises a second driving electrode block;
an orthographic projection of the second driving electrode block on the base substrate at least partially overlaps with the orthographic projection of the gate electrode of the driving transistor in the second sub-pixel of second color on the base substrate.

8 . The display panel according to claim 7 , wherein a shape of the first driving electrode block is different from a shape of the auxiliary electrode block, the shape of the first driving electrode block is identical with a shape of the second driving electrode block, and an area of the orthographic projection of the first driving electrode block on the base substrate is identical with an area of the orthographic projection of the second driving electrode block on the base substrate.

9 . The display panel according to claim 7 , wherein a distance between a center of the gate electrode of the driving transistor of the pixel circuit of the first sub-pixel of second color and a center of the first driving electrode block is greater than a distance between a center of the gate electrode of the driving transistor of the pixel circuit of the second sub-pixel of second color and a center of the second driving electrode block.

10 . The display panel according to claim 7 , wherein the gate electrode of the driving transistor of the pixel circuit of the first sub-pixel of second color and the gate electrode of the driving transistor of the pixel circuit of the second sub-pixel of second color are arranged in a first direction, and the first direction is parallel to a surface of the base substrate,
in the first direction, the first driving electrode block is on a side of the gate electrode of the driving transistor of the pixel circuit of the first sub-pixel of second color close to the gate electrode of the driving transistor of the pixel circuit of the second sub-pixel of second color.

11 . (canceled)

12 . The display panel according to claim 5 , wherein the pixel circuit further comprises a parasitic sub-circuit, the parasitic sub-circuit of the pixel circuit in the first sub-pixel of second color comprises a first capacitor, and the first capacitor comprises a first electrode and a second electrode,
the auxiliary electrode block serves as the first electrode of the first capacitor, and the gate electrode of the driving transistor of the first sub-pixel of second color is multiplexed as the second electrode of the first capacitor, the pixel circuit further comprises a parasitic sub-circuit, the parasitic sub-circuit of the pixel circuit in the second sub-pixel of second color comprises a second capacitor, and the second capacitor comprises a first electrode and a second electrode, the second driving electrode block serves as the first electrode of the second capacitor, and the gate electrode of the driving, transistor of the second-sub-pixel of second color is multiplexed as the second electrode of the second capacitor.

13 . (canceled)

14 . The display panel according to claim 10 , wherein in each repeating unit, the first sub-pixel of second color and the second sub-pixel of second color are arranged along the first direction, and in the first direction, the auxiliary electrode block is on a side of the first driving electrode block away from the light emitting element of the second sub-pixel of second color,
in each repeating unit, the sub-pixel of first color and the sub

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Liu Tingliang
• Qing Haigang
• Yang Huijuan
• Long Yue

Classifications

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10K59/80515

  characterised by their shape · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title