In-cell touch screen panel and display device

• US 9,507,463 B2
• Filed: 05/30/2013
• Issued: 11/29/2016
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Yang, Tong, Xu, Yubo, Hu, Ming, Lim, Byung Cheon
• Primary Examiner(s): Cheng, Joe H
• Application Number:
  US14/368,419
• Publication Number:
  US 20150205440A1
• Time in Patent Office: 1,279 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Embodiments of the present invention disclose an in-cell touch screen panel and a display device, at least one gate signal lines is used as a touch scanning line, a touch readout line is disposed between adjacent columns of pixel units in the array substrate, and a touch unit is disposed in a region defined by the touch scanning line and the touch readout line; each touch unit includes a light sensing sub-unit, a touch electrode and a touch signal control sub-unit; the light sensing sub-unit is connected with the touch signal control sub-unit through the touch electrode, and the control signal output from the light sensing sub-unit varies with the variation of external light and coupling capacitance of the touch electrode; the touch signal control sub-unit is connected with the touch scanning line and the touch readout line respectively, the touch signal control sub-unit outputs the touch sensing signal modulated by the control signal through the touch readout line upon the touch scanning line transferring electrical signals. Compared with a single mode capacitive touch screen panel, the in-cell touch screen panel disclosed in embodiments of the present invention can improve the touch sensitivity of the touch screen panel.

Claims

1. An in-cell touch screen panel comprising an array substrate having a plurality of gate signal lines and a plurality of pixel units arranged in a matrix;

wherein

at least one gate signal line of the array substrate is used as a touch scanning line;

the array substrate has a touch readout line between adjacent colunms of pixel units;

the array substrate has a touch unit located in a region defined by the touch scanning line and the touch readout line;

the touch unit comprises a light sensing sub-unit, a touch electrode and a touch signal control sub-unit;

the light sensing sub-unit is connected with the touch signal control sub-unit through the touch electrode, a control signal output by the light sensing sub-unit to the touch signal control sub-unit varies with variation of external light and coupling capacitance of the touch electrode;

the touch signal control sub-unit is connected with the touch scanning line and the touch readout line respectively, the touch signal control sub-unit outputs touch sensing signals modulated by the control signal through the touch readout line upon the touch scanning line transferring electrical signals.

2. The touch screen panel of claim 1, wherein the array substrate has a plurality of photosensitive scanning lines and a plurality of photosensitive signal lines located between adjacent pixel units in the array substrate;

the light sensing sub-unit comprises a photosensitive transistor;

wherein a gate electrode of the photosensitive transistor is connected with one of the photosensitive scanning lines, a source electrode of the photosensitive transistor is connected with one of the photosensitive signal lines, a drain electrode of the photosensitive transistor is connected with the touch electrode, and the photosensitive signal line is configured to transfer the control signal to the touch electrode when the photosensitive transistor is turned on.

3. The touch screen panel of claim 2, wherein the photosensitive scanning lines are gate signal lines different from the touch scanning lines in the array substrate.

4. The touch screen panel of claim 3, wherein the touch signal control sub-unit comprises a second transistor and a third transistor;

a gate electrode of the second transistor is connected with the touch electrode, a source electrode of the second transistor is connected with a constant voltage signal line or a common electrode, a drain electrode of the second transistor is connected with a source electrode of the third transistor, a drain electrode of the third transistor is connected with the touch readout line, and a gate electrode of the third transistor is connected with the touch scanning line.

5. The touch screen panel of claim 3, further comprising:

at least one touch sub-electrode electrically connected with the touch electrode and located in a gap between adjacent pixel units.

6. The touch screen panel of claim 2, wherein the touch signal control sub-unit comprises a second transistor and a third transistor;

a gate electrode of the second transistor is connected with the touch electrode, a source electrode of the second transistor is connected with a constant voltage signal line or a common electrode, a drain electrode of the second transistor is connected with a source electrode of the third transistor, a drain electrode of the third transistor is connected with the touch readout line, and a gate electrode of the third transistor is connected with the touch scanning line.

7. The touch screen panel of claim 2, further comprising:

at least one touch sub-electrode electrically connected with the touch electrode and located in a gap between adjacent pixel units.

8. The touch screen panel of claim 1, wherein the array substrate has a plurality of photosensitive scanning lines located between adjacent pixel units in the array substrate;

the light sensing sub-unit comprises a photosensitive transistor;

wherein a gate electrode and a source electrode of the photosensitive transistor are connected with one of the photosensitive scanning lines, and a drain electrode of the photosensitive transistor is connected with the touch electrode.

9. The touch screen panel of claim 8, wherein the photosensitive scanning lines are gate signal lines different from the touch scanning lines in the array substrate.

10. The touch screen panel of claim 8, wherein the touch signal control sub-unit comprises a second transistor and a third transistor;

a gate electrode of the second transistor is connected with the touch electrode, a source electrode of the second transistor is connected with a constant voltage signal line or a common electrode, a drain electrode of the second transistor is connected with a source electrode of the third transistor, a drain electrode of the third transistor is connected with the touch readout line, and a gate electrode of the third transistor is connected with the touch scanning line.

11. The touch screen panel of claim 8, further comprising:

at least one touch sub-electrode electrically connected with the touch electrode and located in a gap between adjacent pixel units.

12. The touch screen panel of claim 1, wherein the array substrate has a plurality of photosensitive scanning lines located between adjacent pixel units in the array substrate;

the light sensing sub-unit comprises a photosensitive transistor and a first transistor;

wherein a gate electrode of the photosensitive transistor is connected with one of the photosensitive scanning lines, a drain electrode of the photosensitive transistor is connected with the touch electrode, a source electrode of the photosensitive transistor is connected with a drain electrode of the first transistor; and

a source electrode and a gate electrode of the first transistor are connected with the photosensitive scanning line.

13. The touch screen panel of claim 12, wherein the photosensitive scanning lines are gate signal lines different from the touch scanning lines in the array substrate.

14. The touch screen panel of claim 12, wherein the touch signal control sub-unit comprises a second transistor and a third transistor;

a gate electrode of the second transistor is connected with the touch electrode, a source electrode of the second transistor is connected with a constant voltage signal line or a common electrode, a drain electrode of the second transistor is connected with a source electrode of the third transistor, a drain electrode of the third transistor is connected with the touch readout line, and a gate electrode of the third transistor is connected with the touch scanning line.

15. The touch screen panel of claim 12, further comprising:

at least one touch sub-electrode electrically connected with the touch electrode and located in a gap between adjacent pixel units.

16. The touch screen panel of claim 1, wherein the touch signal control sub-unit comprises a second transistor and a third transistor;

a gate electrode of the second transistor is connected with the touch electrode, a source electrode of the second transistor is connected with a constant voltage signal line or a common electrode, a drain electrode of the second transistor is connected with a source electrode of the third transistor, a drain electrode of the third transistor is connected with the touch readout line, and a gate electrode of the third transistor is connected with the touch scanning line.

17. The touch screen panel of claim 1, wherein the touch readout lines and data signal lines in the array substrate are disposed in a same layer and insulated from each other.

18. The touch screen panel of claim 1, wherein the touch electrodes and a pixel electrode or common electrode in the array substrate are of a same material, disposed in a same layer, and insulated from each other.

19. The touch screen panel of claim 1, further comprising:

at least one touch sub-electrode electrically connected with the touch electrode and located in a gap between adjacent pixel units.

20. A display device comprising the touch screen panel of claim 1.