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

Patent metadata

Field	Value
Publication number	US-9405411-B2
Application number	US-201313866554-A
Country	US
Kind code	B2
Filing date	Apr 19, 2013
Priority date	Oct 22, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Discussed are a display device integrated with a touch screen and a method of driving the same, which can save the manufacturing cost and prevent the degradation of display quality caused by touch driving.

First claim

What is claimed is:

1. A display device integrated with a touch screen, comprising:
a lower substrate configuring a liquid crystal panel, a plurality of gate lines and a plurality of data lines being arranged to intersect each other in the lower substrate;
an upper substrate configuring the liquid crystal panel, the upper substrate being coupled to the lower substrate with a liquid crystal layer therebetween;
a pixel electrode disposed in the lower substrate;
a common electrode disposed in the lower substrate or the upper substrate;
a gate driver supplying a scan signal to the plurality of gate lines;
a data driver supplying data voltages to the respective data lines;
a touch IC supplying a touch driving signal to the data lines;
a switching unit switching input or output of signals such that a display signal for image display is supplied to the liquid crystal panel during a display period, and the touch driving signal is supplied to the data lines during a non-display period; and
a timing controller controlling driving of each of the gate driver, the data driver, and the touch IC,
wherein the switching unit comprises a plurality of switches, and the switching unit is provided inside the data driver,
wherein during the non-display period, the data lines are driven as touch driving electrodes receiving the touch driving signal, and the common electrode or the gate lines are driven as touch sensing electrodes.

2. The display device of claim 1 , wherein the touch IC is built in the data driver.

3. The display device of claim 1 , wherein,
the plurality of data lines are divided into a certain number of groups, and driven as the touch driving electrodes.

4. The display device of claim 1 , wherein, during the non-display period,
the switching unit switches input or output of signals such that the touch driving signal from the touch IC is supplied to the data lines.

5. The display device of claim 1 , wherein the touch driving electrodes and the touch sensing electrodes are disposed on different layers.

6. The display device of claim 1 , wherein the data driver and the touch IC share a same memory.

7. The display device of claim 1 , wherein the touch sensing electrodes are arranged at intervals having a dummy pattern disposed between adjacent touch sensing electrodes.

8. The display device of claim 1 , wherein the gate lines are divided into a certain number of groups when the gate lines are driven as the touch sensing electrodes.

9. The display device of claim 1 , wherein the touch IC senses a capacitive change through the touch sensing electrodes to detect a touched position.

10. The display device of claim 1 , wherein the touch IC senses whether there is a use's touch or a touched position during a reference signal period for dividing a previous frame and a next frame.

11. The display device of claim 1 , wherein the common electrode is disposed in a direction perpendicular to the data lines.

12. The display device of claim 1 , wherein the common electrode is provided in a stripe type.

13. The display device of claim 1 , wherein the data driver and the touch IC share a same DC-DC converter for increasing a data voltage.

14. A display device integrated with a touch screen, comprising:
a lower substrate configuring a liquid crystal panel, a plurality of gate lines and a plurality of data lines being arranged to intersect each other in the lower substrate;
an upper substrate configuring the liquid crystal panel, the upper substrate being coupled to the lower substrate with a liquid crystal layer therebetween;
a pixel electrode disposed in the lower substrate;
a common electrode disposed in the lower substrate or the upper substrate;
a gate driver supplying a scan signal to the plurality of gate lines;
a data driver supplying data voltages to the respective data lines;
a touch IC supplying a touch driving signal to the data lines;
a switching unit switching input or output of signals such that a display signal for image display is supplied to the liquid crystal panel during a display period, and the touch driving signal is supplied to the data lines during a non-display period; and
a timing controller controlling driving of each of the gate driver, the data driver, and the touch IC,
wherein during the non-display period, the data lines are driven as touch driving electrodes receiving the touch driving signal, and the common electrode or the gate lines are driven as touch sensing electrodes.

15. The display device of claim 14 , wherein the touch sensing electrodes are arranged at intervals having a dummy pattern disposed between adjacent touch sensing electrodes.

16. The display device of claim 14 , wherein, during the non-display period,
the switching unit switches input or output of signals such that the touch driving signal from the touch IC is supplied to the data lines.

17. The display device of claim 14 , wherein the touch IC is built in the data driver.

18. The display device of claim 14 , wherein the touch driving electrodes and the touch sensing electrodes are disposed on different layers.

19. The display device of claim 14 , wherein the common electrode is disposed in a direction perpendicular to the data lines.

20. The display device of claim 14 , wherein the common electrode is provided in a stripe type.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Sungchul
• Lee Junghan
• Lee Jeongseop
• Pyo Seungeun
• Lee Yangsik

Classifications

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G09G3/3651 Primary

  using multistable liquid crystals, e.g. ferroelectric liquid crystals · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title