Touch display circuit, drive method thereof, array substrate and display device

• US 9,671,906 B2
• Filed: 12/13/2013
• Issued: 06/06/2017
• Est. Priority Date: 12/13/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Yang, Shengji
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): ENGLISH, ALECIA DIANE
• Application Number:
  US14/106,618
• Publication Number:
  US 20140168157A1
• Time in Patent Office: 1,271 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

The present invention provides a touch display circuit of a pixel unit, a drive method thereof, an array substrate and a display device, by means of which the process steps in manufacturing a touch display product can be reduced, and meanwhile, the aperture ratio of the product can be increased to raise the added value. The touch display circuit comprises a touch unit and a display unit; a first scanning line, a second scanning line, a detection signal line, a data line and a signal control line connected with the touch unit; and a gate line and a data line connected with the display unit, wherein the touch unit comprises a first switch transistor, a second switch transistor, a first capacitor, a touch electrode and an amplifier transistor.

Claims

1. A touch display circuit in a pixel unit, comprising:

a touch unit and a display unit, wherein the touch unit and the display unit are located in one pixel unit;

a first scanning line, a second scanning line, a detection signal line, a data line and a signal control line connected with the touch unit; and

a gate line and the data line connected with the display unit, wherein the display unit and the touch unit share the same data line, and

wherein the touch unit comprises a first switch transistor, a second switch transistor, a first capacitor, a touch electrode and an amplifier transistor;

the source of the first switch transistor is connected to the data line, and the gate of the first switch transistor is connected to the signal control line;

the touch electrode is connected to the drain of the first switch transistor;

the gate of the amplifier transistor is connected to the touch electrode, and the source of the amplifier transistor is connected to the second scanning line;

the gate of the second switch transistor is connected to the first scanning line, the source of the second switch transistor is connected to the drain of the amplifier transistor, and the drain of the second switch transistor is connected to the detection signal line; and

a first electrode of the first capacitor is directly connected to the second scanning line, and a second electrode of the first capacitor is connected to the touch electrode, wherein the first electrode of the first capacitor is formed by the same layer of transparent conductive material as a pixel electrode of the display unit, and the second electrode of the first capacitor is formed by the same layer of transparent conductive material as a common electrode of the display unit.

2. The circuit according to claim 1, wherein the display unit comprises:

a third switch transistor and a second capacitor,

wherein the gate of the third switch transistor is connected to the gate line, and the source of the third switch transistor is connected to the data line;

a first electrode of the second capacitor is connected to the drain of the third switch transistor, and a second electrode of the second capacitor is connected to a ground terminal.

3. The circuit according to claim 2, wherein the gates of the first switch transistor, the second switch transistor, the third switch transistor and the amplifier transistor are all formed by the same layer of material, and the sources and the drains thereof are formed by the same layer of material.

4. The circuit according to claim 3, wherein the first switch transistor and the second switch transistor are P-type transistors or N-type transistors;

and the amplifier transistor is a P-type transistor.

5. The circuit according to claim 2, wherein the third switch transistor is a P-type transistor or an N-type transistor.

6. The circuit according to claim 5, wherein the first switch transistor and the second switch transistor are P-type transistors or N-type transistors;

and the amplifier transistor is a P-type transistor.

7. The circuit according to claim 2, wherein the first switch transistor and the second switch transistor are P-type transistors or N-type transistors;

and the amplifier transistor is a P-type transistor.

8. The circuit according to claim 1, wherein the first switch transistor and the second switch transistor are P-type transistors or N-type transistors;

and the amplifier transistor is a P-type transistor.

9. The circuit according to claim 1, wherein the first switch transistor and the second switch transistor are P-type transistors or N-type transistors;

and the amplifier transistor is a P-type transistor.

10. The circuit according to claim 1, wherein the second switch transistor and the amplifier transistor are located at one side of the touch electrode, and the first switch transistor is located at the other side of the touch electrode which is the opposite side of the one side.

11. The circuit according to claim 1, wherein the first scanning line, the second scanning line and the signal control line are all formed on the same layer as the gate line, are arranged in parallel with the gate line, and are all located in gaps between the current pixel unit and the previous-stage pixel unit or the next-stage pixel unit.

12. The circuit according to claim 1, wherein the detection signal line of the current pixel unit is the data line of the previous-stage pixel unit.

13. A drive method for driving a touch display circuit in the pixel unit comprising:

a touch unit and a display unit, wherein the touch unit and the display unit are located in one pixel unit;

a first scanning line, a second scanning line, a detection signal line, a data line and a signal control line connected with the touch unit; and

a gate line and the data line connected with the display unit, wherein the display unit and the touch unit share the same data line, and wherein the touch unit comprises a first switch transistor, a second switch transistor, a first capacitor, a touch electrode and an amplifier transistor;

the source of the first switch transistor is connected to the data line, and the gate of the first switch transistor is connected to the signal control line;

the touch electrode is connected to the drain of the first switch transistor;

the gate of the amplifier transistor is connected to the touch electrode, and the source of the amplifier transistor is connected to the second scanning line;

the gate of the second switch transistor is connected to the first scanning line, the source of the second switch transistor is connected to the drain of the amplifier transistor, and the drain of the second switch transistor is connected to the detection signal line; and

a first electrode of the first capacitor is directly connected to the second scanning line, and a second electrode of the first capacitor is connected to the touch electrode, the method comprising;

in a first stage, cutting off the first switch transistor, the second switch transistor and the amplifier transistor, inputting a scanning signal through the gate line, and inputting a control signal through the data line of the current pixel unit to control the display unit to be in a display state;

in a second stage, turning on the first switch transistor, cutting off the second switch transistor and the amplifier transistor, inputting a reset signal through the data line to charge the second electrode of the first capacitor, and inputting a scanning signal through the gate line to turn off the display unit; and

in a third stage, cutting off the first switch transistor, turning on the second switch transistor, providing a coupling pulse signal through the second scanning line, and when the touch electrode is touched, the second electrode of the first capacitor is discharged until the voltage difference between the gate and the source of the amplifier transistor is equal to a threshold voltage of the amplifier transistor, so that the amplifier transistor is turned on and in an amplification state, thereby amplifying the coupling pulse signal provided by the second scanning line and outputting the amplified signal to the detection signal line, wherein the first electrode of the first capacitor is formed by the same layer of transparent conductive material as a pixel electrode of the display unit, and the second electrode of the first capacitor is formed by the same layer of transparent conductive material as a common electrode of the display unit.

14. The method according to claim 13, wherein the display unit comprises:

a third switch transistor and a second capacitor,

wherein the gate of the third switch transistor is connected to the gate line, and the source of the third switch transistor is connected to the data line;

a first electrode of the second capacitor is connected to the drain of the third switch transistor, and a second electrode of the second capacitor is connected to a ground terminal; and

the gates of the first switch transistor, the second switch transistor, the third switch transistor and the amplifier transistor are all formed by the same layer of material, and the sources and the drains thereof are formed by the same layer of material.

15. The method according to claim 14, the method further comprising

in the first stage, turning on the third switch transistor;

and

in the second stage and the third stage, cutting off the third switch transistor.

16. The method according to claim 13, wherein the first electrode of the first capacitor is formed by the same layer of transparent conductive material as a pixel electrode of the display unit, and the second electrode of the first capacitor is formed by the same layer of transparent conductive material as a common electrode of the display unit.

17. The method according to claim 13, wherein the first scanning line, the second scanning line and the signal control line are all formed on the same layer as the gate line, are arranged in parallel with the gate line, and are all located in gaps between the current pixel unit and the previous-stage pixel unit or the next-stage pixel unit.

18. The method according to claim 13, wherein the detection signal line of the current pixel unit is the data line of the previous-stage pixel unit.

19. A display panel, comprising an array substrate, wherein at least one pixel unit of the array substrate comprises a touch display circuit comprising:

a touch unit and a display unit, wherein the touch unit and the display unit are located in one pixel unit;

a first scanning line, a second scanning line, a detection signal line, a data line and a signal control line connected with the touch unit; and

a gate line and the data line connected with the display unit, wherein the display unit and the touch unit share the same data line, and

wherein the touch unit comprises a first switch transistor, a second switch transistor, a first capacitor, a touch electrode and an amplifier transistor;

the source of the first switch transistor is connected to the data line, and the gate of the first switch transistor is connected to the signal control line;

the touch electrode is connected to the drain of the first switch transistor;

the gate of the amplifier transistor is connected to the touch electrode, and the source of the amplifier transistor is connected to the second scanning line;

the gate of the second switch transistor is connected to the first scanning line, the source of the second switch transistor is connected to the drain of the amplifier transistor, and the drain of the second switch transistor is connected to the detection signal line; and

a first electrode of the first capacitor is connected to the second scanning line, and a second electrode of the first capacitor is connected to the touch electrode, wherein the first electrode of the first capacitor is formed by the same layer of transparent conductive material as a pixel electrode of the display unit, and the second electrode of the first capacitor is formed by the same layer of transparent conductive material as a common electrode of the display unit.