Display substrate, display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-12148387-B2
Application number	US-202318473830-A
Country	US
Kind code	B2
Filing date	Sep 25, 2023
Priority date	Feb 7, 2021
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A display substrate includes first and second display regions, and a base substrate. A plurality of sub-pixels are arranged on a side of the base substrate, where the-sub-pixels include a first pixel driving circuit and a first light-emitting device connected to each other in the first display region, and the first pixel driving circuit includes at least a compensation transistor, a switching transistor, and a light-emitting device initialization transistor each having an active layer. A scan signal line is provided in the first display region. An orthographic projection of the scan signal line on the base substrate overlaps with that of the active layer of each of the compensation transistor and the light-emitting device initialization transistor, or that of the active layer of each of the switching transistor and the light-emitting device initialization transistor on the base substrate.

First claim

What is claimed is:

1. A display substrate, comprising:
a first display region and a second display region;
a base substrate;
a plurality of sub-pixels arranged on a side of the base substrate, wherein the sub-pixels comprise:
a first pixel driving circuit and a first light-emitting device in the first display region, wherein the first pixel driving circuit is electrically connected to the first light-emitting device and configured to drive the first light-emitting device to emit light, the first pixel driving circuit comprises at least a compensation transistor, a switching transistor, and a light-emitting device initialization transistor, and each of the compensation transistor, the switching transistor and the light-emitting device initialization transistor comprises an active layer; and
a second pixel driving circuit and a second light-emitting device in the second display region, wherein the second pixel driving circuit is electrically connected to the second light-emitting device and configured to drive the second light-emitting device to emit light; and

a scan signal line arranged in the first display region, wherein the scan signal line is configured to provide a scan signal to the first pixel driving circuit,
wherein an orthographic projection of the scan signal line on the base substrate overlaps with an orthographic projection of the active layer of each of the compensation transistor and the light-emitting device initialization transistor of the first pixel driving circuit on the base substrate; or
wherein an orthographic projection of the scan signal line on the base substrate overlaps with an orthographic projection of the active layer of each of the switching transistor and the light-emitting device initialization transistor of the first pixel driving circuit on the base substrate.

2. The display substrate according to claim 1 , wherein the first pixel driving circuit further comprises a reset transistor, the reset transistor comprises an active layer, and the active layer of the light-emitting device initialization transistor of the first pixel driving circuit extends from the active layer of the reset transistor in a direction toward the scan signal line configured to provide the scan signal to the first pixel driving circuit.

3. The display substrate according to claim 1 , wherein a ratio of a size of an orthographic projection of an occupied region of the first pixel driving circuit in the first display region on the base substrate in a first direction to a size of the orthographic projection of the occupied region of the first pixel driving circuit in the first display region on the base substrate in a second direction ranges from 0.8 to 1.2, and the first direction is perpendicular to the second direction.

4. The display substrate according to claim 1 , wherein:
the first pixel driving circuit in the first display region has an active layer, and the active layer of each of the compensation transistor, the switching transistor and the light-emitting device initialization transistor formed as a portion of the active layer of the first pixel driving circuit; and
an orthographic projection of a region occupied by the active layer of the first pixel driving circuit on the base substrate has a first size in a first direction and a second size in a second direction, the first direction is perpendicular to the second direction, and a ratio of the first size to the second size ranges from 0.8 to 1.2.

5. The display substrate according to claim 1 , wherein:
the first pixel driving circuit further comprises a light-emitting control transistor, and the light-emitting control transistor comprises an active layer; and
the display substrate further comprises a first connection portion, a layer where the first connection portion is located is on a side of a layer where the scan signal line is located away from the base substrate, and a first end of the first connection portion is electrically connected to the active layer of the light-emitting device initialization transistor through a first via hole, and a second end of the first connection portion is electrically connected to the active layer of the light-emitting control transistor through a second via hole.

6. The display substrate according to claim 5 , wherein:
the display substrate further comprises an initialization voltage line arranged in the first display region, the initialization voltage line is configured to provide an initialization voltage to the first pixel driving circuit; and
the display substrate further comprises a second connection portion, a layer where the second connection portion is located is on a side of the layer where the scan signal line is located away from the base substrate, and a first end of the second connection portion is electrically connected to the active layer of the light-emitting device initialization transistor through a third via hole, and a second end of the second connection portion is electrically connected to the initialization voltage line through a fourth via hole.

7. The display substrate according to claim 2 , wherein:
the first light-emitting device comprises at least a first electrode and a light-emitting material layer, and the light-emitting material layer is arranged on a side of the first electrode away from the base substrate; and
an orthographic projection of the first electrode on the base substrate and the orthographic projection of the active layer of the light-emitting device initialization transistor on the base substrate at least partially overlap.

8. The display substrate according to claim 7 , wherein:
the plurality of sub-pixels located in the first display region comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and colors of light emitted by the first sub-pixel, the second sub-pixel and the third sub-pixel are different from each other; and
an orthographic projection of a first electrode of a first light-emitting device in the first sub-pixel on the base substrate covers the orthographic projection of the active layer of the light-emitting device initialization transistor on the base substrate; and/or, an orthographic projection of a first electrode of a first light-emitting device in the second sub-pixel on the base substrate covers the orthographic projection of the active layer of the light-emitting device initialization transistor on the base substrate; and/or, an orthographic projection of a first electrode of a first light-emitting device in the third sub-pixel on the base substrate covers most of the orthographic projection of the active layer of the light-emitting device initialization transistor on the base substrate.

9. The display substrate according to claim 8 , wherein the first electrode comprises an electrode body portion and an electrode connection portion, and an orthographic projection of the electrode body portion on the base substrate is circular.

10. The display substrate according to claim 8 , wherein:
the first pixel driving circuit further comprises a driving transistor, an operation control transistor, a light-emitting control transistor, and at least one storage capacitor; and
an orthographic projection of the first electrode in the sub-pixel located in the first display region on the base substrate at least covers orthographic projections of the driving transistor, the compensation transistor, the switching transistor and the light-emitting control transistor of the first pixel driving circuit in the sub-pixel on the base substrate.

11. The display substrate according to claim 10 , wherein:
the display substrate further comprises a reset signal line configured to transmit a reset control signal, a light-emi

Assignees

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

Inventors

• Liu Ke
• Shi Ling
• Chen Yipeng
• Lu Hui
• Xie Shuai
• Wang Zhu
• Zhang Zhenhua

Classifications

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/65

  OLEDs integrated with inorganic image sensors · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• H10D86/421 Primary

  having a particular composition, shape or crystalline structure of the active layer · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title