DISPLAY SUBSTRATE, IN-CELL TOUCH SCREEN AND DISPLAY DEVICE

• US 20180059848A1
• Filed: 06/03/2016
• Published: 03/01/2018
• Est. Priority Date: 03/15/2016
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: DING, Xiaoliang, DONG, Xue, WANG, Haisheng, CHEN, Xiaochuan, LIU, Yingming, YANG, Shengji, LIU, Wei, WANG, Pengpeng, LI, Changfeng
• Granted Patent: US 10,579,182 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04144 using an array of force sensing means position sensing using the local deformation of sensor cells G06F3/0447

Abstract

A display substrate, an in-cell touch screen and a display device the field of touch technology are disclosed. The display substrate includes a TFT, a 2D touch electrode and a pressure-sensing electrode, and includes a first signal output wire for outputting electrical signal of the pressure-sensing electrode. A metallic layer forming a source/drain in the TFT is configured to act as the first signal output wire. The first signal output wire is electrically connected with the pressure-sensing electrode by a through-hole.

Claims

1. A display substrate comprising:

a TFT, a 2D touch electrode, a pressure-sensing electrode, and a first signal output wire for outputting electrical signal of the pressure-sensing electrode, wherein at least a part of a metallic layer forming a source/drain in the TFT is configured to act as the first signal output wire, and the first signal output wire is electrically connected with the pressure-sensing electrode by a through-hole.

2. The display substrate according to claim 1, further comprising a base substrate and a light shielding metallic layer, the light shielding metallic layer and the TFT are ordinally disposed on the base substrate, and at least a part of the light shielding metallic layer is configured to act as the pressure-sensing electrode.

3. The display substrate according to claim 1, further comprising a common electrode layer disposed on the TFT, and at least a part of the common electrode layer is configured to act as the 2D touch electrode.

4. The display substrate according to claim 1, further comprising a second signal output wire for outputting electrical signal of the 2D touch electrode, wherein at least a part of a metallic layer forming a source/drain in the TFT is configured to act as the second signal output wire, and the second signal output wire is electrically connected with the 2D touch electrode by a through-hole.

5. The display substrate according to claim 4, wherein the orthography of the through-hole which connects the first signal output wire with the pressure-sensing electrode and the orthography of the through-hole which connects the second signal output wire with the 2D touch electrode do not coincide on the base substrate.

6. The display substrate according to claim 1, further comprising a gate line which at least a part of a metallic layer forming a gate of the TFT is configured to act as, the pressure-sensing electrode has first electrode lines aligned with the first signal output wires and second electrode lines aligned with the gate line, the first electrode line and other first electrode lines are parallel to each other, the second electrode line and other second electrode lines are parallel to each other, and the first electrode lines and second electrode lines mutually interweave to form a grid-like structure.

7. The display substrate according to claim 6, wherein in the pressure-sensing electrode having a grid-like structure, each of the first electrode lines intersects with each of the second electrode lines to form a node, and each of the first signal output wires is electrically connected with the node on the aligned first electrode line by a through-hole.

8. The display substrate according to claim 6, wherein the openings in the grid-like structure of the pressure-sensing electrode correspond to pixel units of the display substrate in a one-to-one relationship.

9. The display substrate according to claim 1, wherein at least a part of the metallic layer forming the source/drain is also configured to act as a data line, and the first signal output wire is parallel to the data line.

10. The display substrate according to claim 2, wherein the TFT comprises an active layer, a gate insulating layer, the gate metallic layer, an interlayer insulating layer and the source/drain metallic layer ordinally formed on the base substrate, and a buffer layer is disposed between the active layer and the light shielding metallic layer.

11. An in-cell touch screen comprising a display substrate, wherein the display substrate comprises a TFT (thin film transistor), a 2D touch electrode and a pressure-sensing electrode, and comprises a first signal output wire for outputting electrical signal of the pressure-sensing electrode, wherein at least a part of a metallic layer forming a source/drain in the TFT is configured to act as the first signal output wire, and the first signal output wire is electrically connected with the pressure-sensing electrode by a through-hole.

14. The in-cell touch screen according to claim 11, wherein the display substrate further comprises a gate line which at least a part of a metallic layer forming a gate of the TFT is configured to act as, the pressure-sensing electrode has first electrode lines aligned with the first signal output wires and second electrode lines aligned with the gate line, the first electrode line and other first electrode lines are parallel to each other, the second electrode line and other second electrode lines are parallel to each other, and the first electrode lines and second electrode lines mutually interweave to form a grid-like structure.

12. A display device comprising an in-cell touch screen, wherein the in-cell touch screen comprises a display substrate, wherein the display substrate comprises a TFT (thin film transistor), a 2D touch electrode and a pressure-sensing electrode, and comprises a first signal output wire for outputting electrical signal of the pressure-sensing electrode, wherein at least a part of a metallic layer forming a source/drain in the TFT is configured to act as the first signal output wire, and the first signal output wire is electrically connected with the pressure-sensing electrode by a through-hole.

13. The display device according to claim 12, wherein the display substrate further comprises a gate line which at least a part of a metallic layer forming a gate of the TFT is configured to act as, the pressure-sensing electrode has first electrode lines aligned with the first signal output wires and second electrode lines aligned with the gate line, the first electrode line and other first electrode lines are parallel to each other, the second electrode line and other second electrode lines are parallel to each other, and the first electrode lines and second electrode lines mutually interweave to form a grid-like structure.