Display device with an integrated touch screen and method of driving the same

Patent metadata

Field	Value
Publication number	US-9377882-B2
Application number	US-201213710685-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Aug 30, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A display device with an integrated touch screen and a method of driving the same are provided. In a method of driving a display device including an integrated touch screen, including a panel including a plurality of electrodes that are divided into n number of groups, where n is an integer greater than or equal to two, and a touch sensing unit, the method includes: applying data voltages to a plurality of pixels of the panel, during a high logic period of a horizontal sync signal, and applying, by the touch sensing unit, a touch scan signal to one of the n groups every n or more low logic periods of the horizontal sync signal, the touch scan signal being applied to each of the n groups at least one time, during one frame.

First claim

What is claimed is:

1. A display device comprising an integrated touch screen, comprising:
a panel comprising a plurality of electrodes, the electrodes being divided into n number of groups of electrodes, where n is an integer greater than or equal to two;
a data driver configured to:
convert data, inputted from a timing controller, into data voltages; and
supply the data voltages to a plurality of data lines, respectively;

a gate driver configured to sequentially supply a gate signal to a plurality of gate lines, allowing the data voltages to be respectively applied to a plurality of pixels of the panel, during a high logic period of a horizontal sync signal; and
a touch sensing unit configured to:
apply a touch scan signal to one of the n groups of electrodes every n or more low logic periods of the horizontal sync signal and receive a touch sensing signal from said one of the n groups of electrodes to which the touch scan signal is applied to detect a capacitive change of said one of the n groups of electrodes, the touch scan signal being applied to each of the n groups at least one time, during one frame; and
calculate sensed touch coordinates of a first group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during a first low logic period of the horizontal sync signal, among the low logic periods, in a first time period from when the touch scan signal is applied to the first group of the electrodes during the first low logic period of the horizontal sync signal to when the touch signal is applied to a second group of the electrodes during a second low logic period of the horizontal sync signal.

2. The display device of claim 1 , wherein the touch sensing unit is further configured to:
subsequently calculate sensed touch coordinates of a second group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the second low logic period of the horizontal sync signal, in a second time period from when the touch scan signal is applied to the second group of the electrodes during the second low logic period of the horizontal sync signal to when the touch signal is applied to a third group of the electrodes during a third low logic period; and
subsequently calculate sensed touch coordinates of the third group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the third low logic period of the horizontal sync signal, in a third time period from when the touch scan signal is applied to the third group of the electrodes during the third low logic period of the horizontal sync signal to a first low logic period of a next frame after the one frame.

3. The display device of claim 1 , wherein the touch sensing unit is further configured to:
subsequently calculate sensed touch coordinates of a second group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the second low logic period of the horizontal sync signal, in a second time period from when the touch scan signal is applied to the second group of the electrodes during the second low logic period of the horizontal sync signal to when the touch signal is applied to a third group of the electrodes during a third low logic period of the horizontal sync signal;
subsequently calculate sensed touch coordinates of the third group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the third low logic period of the horizontal sync signal, in a third time period from when the touch scan signal is applied to the third group of the electrodes during the third low logic period of the horizontal sync signal to when the touch signal is applied to the first group of the electrodes during a fourth low logic period of the horizontal sync signal; and
subsequently calculate sensed touch coordinates of the first group of the electrodes with the touch scan signal applied thereto during the fourth low logic period of the horizontal sync signal, in a fourth time period from when the touch scan signal is applied to the first group of the electrodes during the fourth low logic period of the horizontal sync signal to a first low logic period of a next frame after the one frame.

4. The display device of claim 1 , wherein the touch sensing unit is further configured to:
subsequently calculate sensed touch coordinates of a second group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the second low logic period of the horizontal sync signal, in a second time period from when the touch scan signal is applied to the second group of the electrodes during the second low logic period of the horizontal sync signal to when the touch signal is applied to a third group of the electrodes during a third low logic period of the horizontal sync signal;
subsequently calculate sensed touch coordinates of the third group of the electrodes, among the groups of electrodes, with the touch scan signal applied thereto during the third low logic period of the horizontal sync signal, in a third time period from when the touch scan signal is applied to the third group of the electrodes during the third low logic period of the horizontal sync signal to when the touch signal is applied to the first group of the electrodes during a selected fourth low logic period of the horizontal sync signal;
subsequently calculate sensed touch coordinates of the first group of the electrodes with the touch scan signal applied thereto during the fourth low logic period of the horizontal sync signal, in a fourth time period from when the touch scan signal is applied to the first group of the electrodes during the fourth low logic period of the horizontal sync signal to when the touch signal is applied to the second group of the electrodes during a fifth low logic period of the horizontal sync signal; and
subsequently calculate sensed touch coordinates of the second group of the electrodes with the touch scan signal applied thereto during the fifth low logic period of the horizontal sync signal, in a fifth time period from when the touch scan signal is applied to the second group of the electrodes during the fifth low logic period of the horizontal sync signal to when the touch signal is applied to the third group of the electrodes during a sixth low logic period of the horizontal sync signal; and
subsequently calculate sensed touch coordinates of the third group of the electrodes with the touch scan signal applied thereto during the sixth low logic period of the horizontal sync signal, in a sixth time period from when the touch scan signal is applied to the third group of the electrodes during the sixth low logic period of the horizontal sync signal to a first low logic period of a next frame after the one frame.

5. The display device of claim 1 , wherein one row of the display device is displayed during one period of the horizontal sync signal.

6. The display device of claim 1 , wherein at least one of the groups of electrodes is driven by the touch scan signal two or more times during one vertical sync period defining said one frame of the display device.

7. The display device of claim 6 , wherein a touch report rate of each of the touch sensing signals during one frame period is higher than a display frame rate during the one frame.

8. The display device of claim 1 , wherein the n groups comprise groups that are divided in a gate-line direction.

9. The display device of claim 1 , further comprising a plurality of switching units further configured to perform switching for the touch scan signal, outputted from the touch sensing unit, to be applied to one of the n group

Assignees

• Lg Display Co Ltd

Inventors

• Kim Sung Chul

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/038 Primary

  Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title