Touch display panel and control circuit thereof

• US 10,303,283 B2
• Filed: 11/02/2015
• Issued: 05/28/2019
• Est. Priority Date: 10/10/2015
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Du, Peng
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Almeida, Cory A
• Application Number:
  US14/897,676
• Publication Number:
  US 20180157366A1
• Time in Patent Office: 1,303 Days
• CPC Class Codes: G06F 11/00 Error detection; Error correction; Monitoring error detection, correction or monitoring in information storage based on relative movement between record carrier and transducer G11B20/18; monitoring, i.e. supervising the progress of recording or reproducing G11B27/36; in static stores G11C29/00
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

Provided is a touch control display penal and a touch control circuit thereof. A test signal line and a touch control signal line are redesigned without any change in a conventional pixel structure, such that the touch control circuit as formed has both a test function and a touch detection function. Therefore, not only the manufacturing costs of an in-cell touch display device are effectively reduced, but the manufacturing procedure is simplified, and the yield rate of the touch display panel is improved as well.

Claims

1. A touch control circuit of a touch display panel, comprising:

a first shorting bar, which is provided thereon with first connecting lines for introducing source control signals;

a second shorting bar, which is provided thereon with second connecting lines for introducing source test signals in a test stage, wherein all or part of the second connecting lines are used for receiving touch sensing signals in a touch control stage;

a third shorting bar, which is provided thereon with third connecting lines for introducing gate control signals;

a fourth shorting bar, which is provided thereon with fourth connecting lines for introducing gate test signals in the test stage, wherein all or part of the fourth connecting lines are used for introducing touch drive signals in the touch control stage;

a source transistor switch array, source transistors of which are connected, through their gates, to the first connecting lines, and connect, through their sources and drains, the second connecting lines to data lines of the touch display panel, under an action of the source control signal; and

a gate transistor switch array, gate transistors of which are connected, through their gates, to the third connecting lines, and connect, through their sources and drains, the fourth connecting lines to scan lines of the touch display panel, under an action of the gate control signals,

wherein, in the touch control stage, all transistors in a display area are turned off;

wherein a first measuring point and a second measuring point are connected to the gates of the source transistors of the source transistor switch array through the first connecting lines;

a third measuring point, a fourth measuring point and a fifth measuring point are connected to the drains of the source transistors through the second connecting lines;

the sources of the source transistors are connected to the data lines of the touch display panel;

a sixth measuring point and a seventh measuring point are connected to the gates of the gate transistors of the gate transistor switch array through the third connecting lines;

an eighth measuring point, a ninth measuring point and a tenth measuring point are connected to the drains of the gate transistors through the fourth connecting lines;

the sources of the gate transistors are connected to the scan lines of the touch display panel;

a number of the gates of the source transistors connected to the first measuring point is less than that of the source transistors connected to the second measuring point;

a number of the drains of the source transistors connected to the third measuring point is equal to that of the source transistors connected to the fourth measuring point, and is less than that of the source transistors connected to the fifth measuring point;

a number of the gates of the gate transistors connected to the sixth measuring point is less than that of the gate transistors connected to the seventh measuring point;

a number of the drains of the gate transistors connected to the eighth measuring point is equal to that of the gate transistors connected to the ninth measuring point, and is less than that of the gate transistors connected to the tenth measuring point.

2. The touch control circuit of claim 1, wherein the source transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array, and the gate transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array.

3. The touch control circuit of claim 1, wherein the touch control circuit and the data lines are arranged in a same layer in an insulating manner.

4. The touch control circuit of claim 1, wherein the touch control circuit and the scan lines are arranged in a same layer in an insulating manner.

5. The touch control circuit of claim 1, wherein in a display stage, the source control signals deactivate all the source transistors in the source transistor switch array, and connect the data lines to data line driving circuits;

and the gate control signals deactivate all the gate transistors in the gate transistor switch array, and connect the scan lines to scan line driving circuits.

6. The touch control circuit of claim 5, wherein the source transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array, and the gate transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array.

7. The touch control circuit of claim 5, wherein the touch control circuit and the data lines are arranged in a same layer in an insulating manner.

8. The touch control circuit of claim 5, wherein the touch control circuit and the scan lines are arranged in a same layer in an insulating manner.

9. The touch control circuit of a touch display panel of claim 1, wherein the second connecting lines connected to the fifth measuring point and the fourth connecting lines connected to the tenth measuring point are in a floating state after the test is completed;

the second connecting lines connected to the third and fourth measuring point, and the fourth connecting lines connected to the eighth and ninth measuring point are connected to a circuit for inputting either the test signals or the touch signals.

10. A touch display panel having a touch control circuit, the touch control circuit comprising:

scan lines, data lines, and a sub pixel unit array formed by the scan lines and tire data lines, wherein a thin film transistor is arranged in each sub pixel unit;

a first shorting bar, which is provided thereon with first connecting lines for introducing source control signals;

a second shorting bar, which is provided thereon with second connecting lines for introducing source test signals in a test stage, wherein all or part of the second connecting lines are used for receiving touch sensing signals in a touch control stage;

a third shorting bar, which is provided thereon with third connecting lines for introducing gate control signals;

a fourth shorting bar, which is provided thereon with fourth connecting lines for introducing gate test signals in the test stage, wherein all or part of the fourth connecting lines are used for introducing touch drive signals in the touch control stage;

a source transistor switch array, source transistors of which are connected, through their gates, to the first connecting lines, and connect, through their sources and drains, the second connecting lines to the data lines, under an action of the source control signals; and

a gate transistor switch array, gate transistors of which are connected, through their gates, to the third connecting lines, and connect through their sources and drains, the fourth connecting lines to the scan lines, under an action of the gate control signals,

wherein, in the touch control stage, all transistors in a display area are turned off;

wherein a first measuring point and a second measuring point are connected to the gates of the source transistors of the source transistor switch array through the first connecting lines;

a third measuring point, a fourth measuring point and a fifth measuring point are connected to the drains of the source transistors through the second connecting lines;

the sources of the source transistors are connected to the data lines of the touch display panel;

a sixth measuring point and a seventh measuring point are connected to the gates of the gate transistors of the gate transistor switch array through the third connecting lines;

an eighth measuring point, a ninth measuring point and a tenth measuring point are connected to the drains of the gate transistors through the fourth connecting lines;

the sources of the gate transistors are connected to the scan lines of the touch display panel;

a number of the gates of the source transistors connected to the first measuring point is less than that of the source transistors connected to the second measuring point;

a number of the drains of the source transistors connected to the third measuring point is equal to that of the source transistors connected to the fourth measuring point, and is less than that of the source transistors connected to the fifth measuring point;

a number of the gates of the gate transistors connected to the sixth measuring point is less than that of the gate transistors connected to the seventh measuring point;

a number of the drains of the gate transistors connected to the eighth measuring point is equal to that of the gate transistors connected to the ninth measuring point, and is less than that of the gate transistors connected to the tenth measuring point.

11. The touch display panel of claim 10, wherein the source transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array, and the gate transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array.

12. The touch display panel of claim 10, wherein the touch control circuit and the data lines are arranged in a same layer in an insulating manner.

13. The touch display panel of claim 10, wherein the touch control circuit and the scan lines are arranged in a same layer in an insulating manner.

14. The touch display panel of claim 10, wherein in a display stage, the source control signals deactivate all the source transistors in the source transistor switch array, and connect the data lines to data line driving circuits;

and the gate control signals deactivate all the gate transistors in the gate transistor switch array, and connect the scan lines to scan line driving circuits.

15. The touch display panel of claim 14, wherein the source transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array, and the gate transistor switch array is a thin film field effect transistor array or a metal-oxide semiconductor field effect transistor array.

16. The touch display panel of claim 14, wherein the touch control circuit and the data lines are arranged in a same layer in an insulating manner.

17. The touch display panel of claim 14, wherein the touch control circuit and the scan lines are arranged in a same layer in an insulating manner.

18. The touch display panel of claim 10, wherein the second connecting lines connected to the fifth measuring point and the fourth connecting lines connected to the tenth measuring point are in a floating state after the test is completed;

the second connecting lines connected to the third and fourth measuring point, and the fourth connecting lines connected to the eighth and ninth measuring point are connected to a circuit for inputting either the test signals or the touch signals.