DISPLAY WITH INTEGRATED TOUCH SENSOR AND DRIVING METHOD THEREOF

• US 20120242597A1
• Filed: 12/23/2011
• Published: 09/27/2012
• Est. Priority Date: 03/25/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: HWANG, Sangsoo, KIM, Cheolse, HAN, Manhyeop
• Granted Patent: US 9,019,215 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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: 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

A display with integrated touch sensor and a driving method thereof are provided. The display comprises a display data driving circuit that supplies analog video data voltages to data lines of a display panel during a display period and maintains the voltage of the data lines at the same specific DC voltage during a touch sensor driving period; a display scan driving circuit that sequentially supplies scan pulses synchronized with the analog video data voltages to the gate lines of the display panel during the display period; a touch sensor driving circuit that sequentially supplies driving pulses to the Tx lines of the display panel during the touch sensor driving period; and a touch sensor readout circuit that receives a touch signal from the mutual capacitances via the Rx lines of the display panel during the touch sensor driving period.

Claims

1. A display with integrated touch sensor comprising:

a display panel comprising data lines for supplying data voltages to the pixels, gate lines for supplying scan pulses to the pixels, and Tx lines and Rx lines crossing each other and having mutual capacitances formed at intersections thereof;

a display data driving circuit that supplies analog video data voltages to the data lines during a display period and maintains the voltage of the data lines at the same specific DC voltage during a touch sensor driving period;

a display scan driving circuit that sequentially supplies scan pulses synchronized with the analog video data voltages to the gate lines during the display period;

a touch sensor driving circuit that sequentially supplies driving pulses to the Tx lines during the touch sensor driving period; and

a touch sensor readout circuit that receives a touch signal from the mutual capacitances via the Rx lines during the touch sensor driving period.

2. The display with integrated touch sensor of claim 1, wherein the specific DC voltage is a ground voltage or a DC voltage similar to the ground voltage.

3. The display with integrated touch sensor of claim 1, wherein the scan pulses swing between a gate high voltage and a gate low voltage, and

the display scan driving circuit maintains the voltage of the gate lines at the gate low voltage during the touch sensor driving period.

4. The display with integrated touch sensor of claim 1, wherein an output end of the display scan driving circuit comprises pull-down transistors connected to the gate lines, and

the source-drain resistance of each of the pull-down transistors is a value between 10 kΩ

to 150 kΩ

.

5. The display with integrated touch sensor of claim 1, wherein an output end of the display scan driving circuit comprises pull-down transistors connected to the gate lines, and

the source-drain resistance of each of the pull-down transistors is greater than 0 kΩ

and less than 2 kΩ

.

6. A method for driving a display with integrated touch sensor comprising a display panel comprising data lines for supplying data voltages to the pixels, gate lines for supplying scan pulses to the pixels, and Tx lines and Rx lines crossing each other and having mutual capacitances formed at intersections thereof, the method comprising:

supplying analog video data voltages to the data lines during a display period;

sequentially supplying scan pulses synchronized with the analog video data voltages to the gate lines during the display period;

sequentially supplying driving pulses to the Tx lines during the touch sensor driving period; and

receiving a touch signal from the mutual capacitances via the Rx lines during the touch sensor driving period.

7. The method of claim 6, wherein the specific DC voltage is a ground voltage or a DC voltage similar to the GND voltage.

8. The method of claim 6, further comprising maintaining the voltage of the gate lines at the gate low voltage during the touch sensor driving period,

wherein the scan pulse swings between a gate high voltage and a gate low voltage.

9. The method of claim 6, wherein an output end of the display scan driving circuit comprises pull-down transistors connected to the gate lines, and

the source-drain resistance of each of the pull-down transistors is a value between 10 kΩ

to 150 kΩ

.

10. The method of claim 6, wherein an output end of the display scan driving circuit comprises pull-down transistors connected to the gate lines, and

the source-drain resistance of each of the pull-down transistors is greater than 0 kΩ

and less than 2 kΩ

.