Display device integrated with touch screen having physically divided plurality of touch elrctrodes and driving method thereof

• US 9,904,420 B2
• Filed: 09/16/2014
• Issued: 02/27/2018
• Est. Priority Date: 09/17/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Hoon Bae, Kim, Cheol Se, Han, Sung Su, Kang, Seong Kyu
• Primary Examiner(s): Yang, Kwang-Su
• Application Number:
  US14/487,594
• Publication Number:
  US 20150077370A1
• Time in Patent Office: 1,260 Days
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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

Abstract

Discussed is a display device integrated with touch screen. The display device includes a plurality of touch groups into which a plurality of touch electrodes are physically divided, a plurality of first driving electrode lines connected to a plurality of driving electrodes of a first touch group of the touch groups, a plurality of second driving electrode lines connected to a plurality of driving electrodes of a second touch group of the touch groups, a plurality of first receiving electrode lines connected to a plurality of receiving electrodes of the first touch group, a plurality of second receiving electrode lines connected to a plurality of receiving electrodes of the second touch group, a touch driving IC configured to supply a touch driving signal to the first and second driving electrode lines, and a touch sensing IC configured to sense touch signals of the first and second receiving electrode lines.

Claims

1. A display device including a plurality of touch electrodes formed in a display panel in an in-cell touch type touch screen, the display device comprising:

a plurality of first driving electrode lines connected to a plurality of driving electrodes of a first touch group of a plurality of touch groups;

a plurality of second driving electrode lines connected to a plurality of driving electrodes of a second touch group of the plurality of touch groups;

a plurality of first receiving electrode lines connected to a plurality of receiving electrodes of the first touch group;

a plurality of second receiving electrode lines connected to a plurality of receiving electrodes of the second touch group;

a touch driving IC (Integrated Circuit) configured to supply a touch driving signal to the plurality of first driving electrode lines and the plurality of second driving electrode lines; and

a touch sensing IC configured to sense touch signals of the plurality of first receiving electrode lines and touch signals of the plurality of second receiving electrode lines,

wherein both the plurality of first driving electrode lines and the plurality of second driving electrode lines are individually connected to one touch driving IC,

wherein both the plurality of first receiving electrode lines and the plurality of second receiving electrode lines are individually connected to one touch sensing IC,

wherein one frame is divided into a display period in which a display operation is performed and a non-display period in which a touch sensing operation is performed,

wherein an operation frequency of the touch sensing operation is n-times higher than an operation frequency of the display operation when the number of the touch groups is n, where n is a natural number greater than 1,

wherein a common electrode formed for supplying a common voltage to each pixel is used as one between the plurality of driving electrodes and the plurality of receiving electrodes, and the other between the plurality of driving electrodes and the plurality of receiving electrodes which are separately formed, and

wherein the plurality of driving electrodes are formed on a first layer different from a second layer on which the plurality of receiving electrodes are formed.

2. The display device of claim 1, wherein the touch driving IC simultaneously supplies the touch driving signal to the plurality of first driving electrode lines of the first touch group and the plurality of second driving electrode lines of the second touch group.

3. The display device of claim 2, wherein the touch driving IC sequentially supplies the touch driving signal to the first driving electrode lines of the first touch group, and simultaneously, sequentially supplies the touch driving signal to the second driving electrode lines of the second touch group.

4. The display device of claim 1, wherein the touch sensing IC simultaneously senses touch signals of the plurality of first receiving electrode lines of the first touch group and touch signals of the plurality of second receiving electrode lines of the second touch group.

5. The display device of claim 4, wherein the touch sensing IC sequentially senses the touch signals of the plurality of first receiving electrode lines of the first touch group, and simultaneously, sequentially senses the touch signals of the plurality of second receiving electrode lines of the second touch group.

6. The display device of claim 1, wherein the touch driving IC includes:

a first touch driving IC configured to supply the touch driving signal to the plurality of first receiving electrode lines of the first touch group; and

a second touch driving IC configured to supply the touch driving signal to the plurality of second receiving electrode lines of the second touch group.

7. The display device of claim 1, wherein the touch sensing IC includes:

a first touch sensing IC configured to sense touch signals of the plurality of first receiving electrode lines of the first touch group; and

a second touch sensing IC configured to sense touch signals of the plurality of second receiving electrode lines of the second touch group.

8. The display device of claim 1, wherein the touch driving IC includes a first touch driving IC and a second touch driving IC, and

wherein the touch sensing IC includes a first touch sensing IC and a second touch sensing IC.

9. The display device of claim 1, wherein the touch driving IC supplies the touch driving signal during the non-display period, and the touch sensing IC simultaneously senses the touch signals during the non-display period.

10. The display device of claim 1, wherein the first touch group is used to sense a touch input to a left half of the touch screen, and the second touch group is used to sense a touch input to a right half of the touch screen.

11. A method of driving a display device including a plurality of touch electrodes foamed in a display panel in an in-cell touch type touch screen, the method comprising:

during a display period, displaying an image in a plurality of pixels formed in the display panel;

during a non-display period, supplying a touch driving signal to a plurality of driving electrodes of a first touch group among a plurality of touch groups and connected to a plurality of first driving electrode lines, and simultaneously supplying the touch driving signal to a plurality of driving electrodes of a second touch group among the plurality of touch groups and connected to a plurality of second driving electrode lines; and

sensing touch signals of a plurality of receiving electrode lines of the first touch group, and simultaneously sensing touch signals of a plurality of receiving electrode lines of the second touch group,

wherein both the plurality of first driving electrode lines and the plurality of second driving electrode lines are individually connected to one touch driving IC (Integrated Circuit),

wherein both the plurality of first receiving electrode lines and the plurality of second receiving electrode lines are individually connected to one touch sensing IC,

wherein one frame is divided into the display period in which a display operation is performed and the non-display period in which a touch sensing operation is performed,

wherein an operation frequency of the touch sensing operation is n-times higher than an operation frequency of the display operation when the number of the touch groups is n, where n is a natural number greater than 1,

wherein a common electrode formed for supplying a common voltage to each pixel is used as one between the plurality of driving electrodes and the plurality of receiving electrodes, and the other between the plurality of driving electrodes and the plurality of receiving electrodes which are separately formed, and

wherein the plurality of driving electrodes are formed on a first layer different from a second layer on which the plurality of receiving electrodes are formed.

12. The method of claim 11, further comprising:

sequentially supplying the touch driving signal to the first driving electrode lines of the first touch group, and simultaneously sequentially supplying the touch driving signal to the second driving electrode lines of the second touch group.

13. The method of claim 11, further comprising:

sequentially sensing the touch signals of the plurality of first receiving electrode lines of the first touch group, and simultaneously sequentially sensing the touch signals of the plurality of second receiving electrode lines of the second touch group.

14. The method of claim 11, wherein the first and second touch groups are simultaneously driven to sense touch signals of two channels of a touch sensing IC.

15. The method of claim 11, wherein a display operation and the touch sensing operation are performed in the display period and the non-display period into which one horizontal period is divided, respectively.

16. The method of claim 11, further comprising:

driving a first touch sensing IC to sense a touch signal of the plurality of first receiving electrode lines of the first touch group; and

simultaneously driving a second touch sensing IC to sense a touch signal of the plurality of second receiving electrode lines of the second touch group.

17. The method of claim 11, further comprising:

driving a first touch driving IC to sense touch signals of the plurality of first receiving electrode lines of the first touch group; and

driving a second touch driving IC to sense touch signals of the plurality of second receiving electrode lines of the second touch group.

18. The method of claim 11, wherein the first touch group is used to sense a touch input to a left half of the touch screen, and the second touch group is used to sense a touch input to a right half of the touch screen.