Display substrate and manufacturing method therefor, and display apparatus

Patent metadata

Field	Value
Publication number	US-12001638-B2
Application number	US-202117790039-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	Jun 8, 2020
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A display substrate includes a first base, touch signal lines and touch units. The touch signal lines are disposed on a side of the first base, and lengths of at least two touch signal lines decrease in sequence. The touch units are disposed on a side of the touch signal lines away from the first base, and a touch unit is electrically connected to a touch signal line. Resistances of at least two touch units increase in sequence, and the at least two touch units in an increase order of the resistances in sequence are electrically connected to the at least two touch signal lines in a decrease order of the lengths in sequence, respectively. The touch units each include a touch electrode, and at least one of the at least two touch units further includes an auxiliary electrode stacked with and electrically connected to a touch electrode.

First claim

What is claimed is:

1. A display substrate, comprising:
a first base;
a plurality of touch signal lines disposed on a side of the first base, lengths of at least two touch signal lines decreasing in sequence;
a plurality of touch units disposed on a side of the plurality of touch signal lines away from the first base, wherein a touch unit is electrically connected to a touch signal line, resistances of at least two touch units increase in sequence, and the at least two touch units in an increasing order of the resistances in sequence are electrically connected to the at least two touch signal lines in a decreasing order of the lengths in sequence, respectively; and
a first planarization layer disposed between the plurality of touch signal lines and the plurality of touch units;
wherein the plurality of touch units each include a touch electrode, and at least one touch unit of the at least two touch units further includes an auxiliary electrode that is stacked with and electrically connected to a touch electrode included in the at least one touch unit; and
wherein in a touch unit including an auxiliary electrode and a touch electrode, a surface of the auxiliary electrode proximate to the touch electrode is in direct contact with a surface of the touch electrode proximate to the auxiliary electrode, the auxiliary electrode is located on a side of the touch electrode proximate to the first base, a surface of the first planarization layer away from the first base is provided with a plurality of grooves therein, and the auxiliary electrode is disposed in a groove of the plurality of grooves.

2. The display substrate according to claim 1 , wherein in a touch unit including an auxiliary electrode and a touch electrode, an orthogonal projection of the auxiliary electrode on the first base is within an orthogonal projection of the touch electrode on the first base.

3. The display substrate according to claim 1 , wherein areas of orthogonal projections of the touch electrodes included in the plurality of touch units on the first base are approximately equal.

4. The display substrate according to claim 1 , wherein the plurality of touch signal lines extend substantially in a first direction, and are sequentially arranged in a second direction; the first direction intersects with the second direction;
the plurality of touch signal lines include a plurality of groups of touch signal lines, and each group of touch signal lines includes at least one touch signal line; and
a length of a group of touch signal lines proximate to the edge of the first base are greater than a length of a group of touch signal lines proximate to the middle of the first base, and a resistance of a touch unit connected to the group of touch signal lines proximate to the edge of the first base are less than a resistance of a touch unit connected to the group of touch signal lines proximate to the middle of the first base.

5. The display substrate according to claim 4 , wherein each group of touch signal lines includes touch signal lines, in the first direction that is a direction from an end of the first base to an opposite end thereof, resistances of touch units that are connected to at least one group of touch signal lines increase in sequence.

6. The display substrate according to claim 4 , wherein each group of touch signal lines includes touch signal lines, areas of orthogonal projections, on the first base, of auxiliary electrodes in touch units that are connected to at least one group of touch signal lines decreases in sequence in the first direction.

7. The display substrate according to claim 1 , wherein resistances of touch units that are connected to touch signal lines with approximately equal lengths are approximately equal.

8. The display substrate according to claim 1 , wherein a sum of resistances of each touch signal line and a touch unit connected thereto is approximately equal.

9. The display substrate according to claim 1 , wherein a thickness of the auxiliary electrode and a depth of the groove are approximately equal.

10. The display substrate according to claim 1 , wherein the display substrate has a display region and a bonding region;
the display substrate further comprises:
a plurality of thin film transistors disposed in the display region, each thin film transistor including a gate, a source and a drain, wherein
each touch signal line includes a first portion and a second portion, the first portion is located in the display region, an end of the second portion is electrically connected to the first portion, and another end of the second portion extends into the bonding region;
the first portion of the touch signal line is disposed in a same layer as the source and the drain; and
the second portion of the touch signal line is disposed in a same layer as the gate, or is disposed in a same layer as the source and the drain.

11. The display substrate according to claim 1 , wherein in a touch unit including an auxiliary electrode and a touch electrode, a material of the auxiliary electrode includes a light-transmitting conductive material, and the auxiliary electrode is in a shape of a block; or
a material of the auxiliary electrode includes a non-light-transmitting conductive material, and the auxiliary electrode is in a shape of a grid.

12. A manufacturing method for a display substrate, comprising:
providing a first base;
forming a plurality of touch control signal lines on a side of the first base, lengths of at least two touch signal lines decreasing in sequence; and
forming a plurality of touch units on a side of the plurality of touch signal lines away from the first base, a touch unit being electrically connected to a touch signal line;
wherein resistances of at least two touch units increase in sequence, the at least two touch units in an increasing order of the resistances in sequence are electrically connected to the at least two touch signal lines in a decreasing order of the lengths in sequence, respectively; the plurality of touch units each include a touch electrode; and at least one touch unit of the at least two touch units further includes an auxiliary electrode that is stacked with and electrically connected to a touch electrode of the at least one touch unit; and
wherein in a touch unit including an auxiliary electrode and a touch electrode, a surface of the auxiliary electrode proximate to the touch electrode is in direct contact with a surface of the touch electrode proximate to the auxiliary electrode, and the auxiliary electrode is located on a side of the touch electrode proximate to the first base; and
forming the plurality of touch units on the side of the plurality of touch signal lines away from the first base includes:
forming a planarization film on the side of the plurality of touch signal lines away from the first base; patterning the planarization film to form second via holes for exposing the plurality of touch signal lines in the planarization film, and to form a plurality of grooves on a surface of the planarization film away from the first base, so as to obtain a first planarization layer;
forming a first conductive film on a side of the first planarization layer away from the first base;
patterning the first conductive film, and reserving portions of the first conductive film located in the plurality of grooves, so as to obtain a plurality of auxiliary electrodes;
forming a second conductive film on a side of the plurality of auxiliary electrodes away from the first base; and
patterning the second conductive film to obtain a plurality of touch electrodes, wherein the auxiliary electrode is electrically connected to the touch electrode.

Assignees

• Ordos Yuansheng Optoelectronics Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Ren Yanwei
• Liu Min

Classifications

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title