US 12,464,909 B2Granted

Display substrate, preparation method therefor, and display apparatus

AssigneeBeijing BOE Technology Development Co., Ltd.

InventorsMei Li, Libin Liu

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Abstract

A display substrate, a preparation method therefor, and a display apparatus are provided. In a plane parallel to the display substrate, the display substrate includes multiple sub-pixels. At least one sub-pixel includes a pixel driving circuit at least including a drive transistor. An active layer of the drive transistor includes a channel region which includes a drain terminal segment extending in a first direction, an intermediate segment connected to the drain terminal segment, and a source terminal segment connected to the intermediate segment. A first end of the drain terminal away from the intermediate segment has a first width, a second end of the drain terminal segment close to the intermediate segment has a second width. The first width is greater than the second width. The first and second widths are dimensions of the drain terminal segment in a second direction. The first direction intersects with the second direction.

Claims19

Dependent claims

A display substrate, comprising a plurality of sub-pixels in a plane parallel to the display substrate, wherein at least one of the sub-pixels comprises a pixel driving circuit, the pixel driving circuit at least comprises a drive transistor;

an active layer of the drive transistor comprises a channel region, the channel region comprises a first channel terminal segment extending in a first direction, an intermediate segment connected to the first channel terminal segment, and a second channel terminal segment connected to the intermediate segment;
a first end of the first channel terminal segment away from the intermediate segment has a first width, and a second end of the first channel terminal segment close to the intermediate segment has a second width;
the first width is greater than the second width;
the first width and the second width are dimensions of the first channel terminal segment in a second direction, and the first direction is intersected with the second direction,
wherein the intermediate segment of the channel region comprises a second channel segment, a third channel segment, and a fourth channel segment;
the second end of the first channel terminal segment is connected to a first end of the second channel segment;
a second end of the second channel segment extends in a direction opposite to the second direction, to be connected to a first end of the third channel segment;
a second end of the third channel segment extends in the first direction, to be connected to a first end of the fourth channel segment;
a second end of the fourth channel segment extends in the second direction, to be connected to a first end of the second channel terminal segment;
and a second end of the second channel terminal segment is connected to the second region of the active layer.

7 more elements

A method for preparing a display substrate, wherein the display substrate comprising a plurality of sub-pixels in the plane parallel to the display substrate, at least one sub-pixel comprises a pixel driving circuit, and the pixel driving circuit at least comprises a drive transistor, and the method comprises:

forming a semiconductor layer or a first semiconductor layer on a base substrate, wherein the semiconductor layer or the first semiconductor layer at least comprises an active layer of the drive transistor, the active layer of the drive transistor comprises a channel region, the channel region comprises a first channel terminal segment extending in a first direction, an intermediate segment connected to the first channel terminal segment, and a second channel terminal segment connected to the intermediate segment;
a first end of the first channel terminal segment away from the intermediate segment, has a first width, and a second end of the first channel terminal segment close to the intermediate segment has a second width;
the first width is greater than the second width;
the first width and the second width are dimensions of the first channel terminal segment in a second direction, and the first direction is intersected with the second direction,
wherein the intermediate segment of the channel region comprises a second channel segment, a third channel segment, and a fourth channel segment;
the second end of the first channel terminal segment is connected to a first end of the second channel segment;
a second end of the second channel segment extends in a direction opposite to the second direction, to be connected to a first end of the third channel segment;
a second end of the third channel segment extends in the first direction, to be connected to a first end of the fourth channel segment;
a second end of the fourth channel segment extends in the second direction, to be connected to a first end of the second channel terminal segment;
and a second end of the second channel terminal segment is connected to the second region of the active layer.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/630,172Filed 22 Mar 2021
Published: US 2023/0380227 A123 Nov 2023
Granted: 4 Nov 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H10K 59/131
Active-matrix OLED [AMOLED] displays: interconnections, e.g. wiring lines or terminals
H10D 30/6717
Characterised by the doping profiles, e.g. having lightly-doped source or drain extensions: the source and the drain regions being asymmetrical
H10D 30/6757
Thin-film transistors [TFT]: characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile
H10D 86/441
Characterised by multiple TFTs: interconnections, e.g. scanning lines