DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN AND METHOD OF DRIVING THE SAME

• US 20140160041A1
• Filed: 10/03/2013
• Published: 06/12/2014
• Est. Priority Date: 12/11/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: SEO, Seong Mo, KIM, Sung Chul
• Granted Patent: US 9,189,097 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 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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 3/0443 using a single layer of sensing electrodes

Abstract

Discussed is a display device with integrated touch screen including a panel including a plurality of electrodes; a data driver for converting RGB data inputted from a timing controller into a data voltage, and supplying the data voltage to data lines; a gate driver for sequentially supplying a gate signal to gate lines so as to apply the data voltage to pixels of the panel during a high logic period of a horizontal sync signal; and a touch IC for supplying the touch scan signal to the plurality of electrodes every low logic period of the horizontal sync signal, wherein the touch IC applies the touch scan signal, at least once, to each of the electrodes during one frame.

Claims

1. A display device with integrated touch screen, comprising:

a panel including a plurality of electrodes;

a data driver for converting RGB data inputted from a timing controller into a data voltage, and supplying the data voltage to data lines;

a gate driver for sequentially supplying a gate signal to gate lines so as to apply the data voltage to pixels of the panel during a high logic period of a horizontal sync signal; and

a touch IC for supplying the touch scan signal to the plurality of electrodes every low logic period of the horizontal sync signal,

wherein the touch IC applies the touch scan signal, at least once, to each of the electrodes during one frame.

2. The display device of claim 1, wherein the touch IC calculates touch coordinates by receiving a touch sensing signal from the plurality of electrodes.

3. The display device of claim 2, wherein a touch report rate of the touch sensing signal during one frame is higher than a display frame rate during one frame.

4. The display device of claim 1, wherein the panel includes the plurality of electrodes which are divided into n-numbered groups wherein ‘

n’

is an integer above 2.

5. The display device of claim 4, wherein the n-numbered group are divided in a gate line direction.

6. The display device of claim 4, further comprising a plurality of switches being switched to apply the touch scan signal outputted from the touch IC to any one of the n-numbered groups.

7. The display device of claim 6, wherein the plurality of switches are switched to apply the touch scan signal to any one of the groups of the panel during a low logic group period.

8. The display device of claim 6, wherein the low logic group period is the period including the plural low logic periods of horizontal sync signal, also is the period for which the touch scan signal is applied to all the electrodes included in any one group.

9. The display device of claim 6, wherein each of the switches is connected with one electrode by each group.

10. The display device of claim 6, wherein each of the switches is 1 to n demultiplexer.

11. The display device of claim 4, wherein the touch IC includes a plurality of 1 to n demultiplexers switched to apply the touch scan signal outputted from the touch IC to any one of the n-numbered groups.

12. A method of driving a display device with integrated touch screen comprising a panel including a plurality of electrodes, a touch IC, a gate driver and a data driver, comprising:

applying a data voltage to pixels of the panel during a high logic period of a horizontal sync signal by the gate driver and the data driver; and

supplying the touch scan signal to the plurality of electrodes every low logic period of the horizontal sync signal by the touch IC,

wherein the step of applying the touch scan signal is carried out by applying the touch scan signal, at least once, to each of the electrodes during one frame.

13. The method of claim 12, further comprising receiving the touch sensing signal in the touch IC from the plurality of electrodes, and calculating touch coordinates by the touch IC.

14. The method of claim 13, wherein a touch report rate of the touch sensing signal during one frame is higher than a display frame rate during one frame.