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

• US 10,209,842 B2
• Filed: 01/19/2018
• Issued: 02/19/2019
• Est. Priority Date: 02/20/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, JungHan, Kim, HongChul, Kim, SungChul, Lee, JeongSeop, Pyo, SeungEun
• Primary Examiner(s): Ahn, Sejoon
• Application Number:
  US15/875,696
• Publication Number:
  US 20180143712A1
• Time in Patent Office: 396 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Discussed are a display device with an integrated touch screen and a method of operating the same. The display device according to an embodiment includes a display panel including a plurality of pixel electrodes; a touch screen including m number of electrodes which are formed to overlap with the plurality of pixel electrodes, wherein m is a multiple of n, and n is an integer equal to or greater than two, and wherein the m electrodes are divided into n number of electrode groups; a touch driver configured to generate a touch scan signal and to supply the generated touch scan signal to a display driver; and the display driver configured to apply a common voltage or the touch scan signal to one or more of the m electrodes depending on a driving mode of the display device.

Claims

1. A display driver integrated circuit (IC) for driving a self-capacitive touch sensitive display device comprising a display panel having a plurality of touch electrodes including at least a first group of touch electrodes including a first touch electrode and a second touch electrode and a second group of touch electrodes including a third touch electrode and a fourth touch electrode, a plurality of touch lines including at least a first touch line, a second touch line, a third touch line and a fourth touch line, a plurality of pixel electrodes in a pixel area of the display panel, and a plurality of data lines electrically connected to the plurality of pixel electrodes, the display driver IC comprising:

a first multiplexer;

a second multiplexer; and

a plurality of touch channel outputs, the plurality of touch channel outputs including at least a first touch channel output, a second touch channel output, a third touch channel output and a forth touch channel output;

wherein the first multiplexer is configured to selectively connect to the first touch channel output or the third touch channel output during a touch period, wherein the second multiplexer is configured to selectively connect to the second touch channel output or the fourth touch channel output during the touch period, wherein the first touch electrode is connected to the first channel output via the first touch line, the second touch electrode is connected to the second channel output via the second touch line, the third touch electrode is connected to the third channel output via the third touch line, the fourth touch electrode is connected to the fourth channel output via the fourth touch line.

2. The display driver IC of claim 1, wherein the display driver IC is configured to supply a touch scan signal to the plurality of touch electrodes during the touch period.

3. The display driver IC of claim 1, wherein the display driver IC is configured to supply a common voltage to the plurality of touch electrodes and to respectively supply data voltages to the plurality of pixel electrodes via the plurality of data lines during a display period.

4. The display driver IC of claim 1, wherein the display driver IC is configured to supply the touch scan signal to the first touch electrode and the second touch electrode simultaneously during a first part of the touch period, and

wherein the display driver IC is configured to supply the touch scan signal to the third touch electrode and the fourth touch electrode simultaneously during a second part of the touch period.

5. The display driver IC of claim 1, further comprising a first switching unit and second switching unit, the first switching unit configured to selectively supply a common voltage or a touch scan signal to the first multiplexer, the second switching unit configured to selectively supply the common voltage or the touch scan signal to the second multiplexer.

6. The display driver IC of claim 1, wherein the first touch electrode is not overlapped with the second touch electrode in the first touch electrode group of the touch electrodes, and the third touch electrode is not overlapped with the fourth touch electrode in the second touch electrode group of the touch electrodes.

7. The display driver IC of claim 1, wherein the first touch line is not overlapped with the second touch line in a touch screen area of the display panel, wherein the third touch line is not overlapped with the fourth touch line in the touch screen area of the display panel.

8. The display driver IC of claim 1, wherein the first touch line and the second touch line are arranged in a same direction in the touch screen area of the display panel, wherein the third touch line and the fourth touch line are arranged in a same direction in the touch screen area of the display panel.

9. The display driver IC of claim 1, wherein the plurality of pixel electrodes of the display panel are respectively connected to the plurality of data channel outputs of the display driver IC via the plurality of data lines.

10. A touch sensitive display device comprising:

a display panel comprising;

a plurality of touch electrodes, the plurality of touch electrodes including at least a first group of touch electrodes including a first touch electrode and a second touch electrode and a second group of touch electrodes including a third touch electrode and a fourth touch electrode,

a plurality of touch lines, the plurality of touch lines including at least a first touch line, a second touch line, a third touch line and a fourth touch line,

a plurality of pixel electrodes in a pixel area of the display panel, and

a plurality of data lines electrically connected to the plurality of pixel electrodes; and

a display driver IC comprising a plurality of touch channel outputs and a plurality of data channel outputs, the plurality of touch channel outputs including at least a first touch channel output, a second touch channel output, a third touch channel output and a fourth touch channel output;

wherein the first touch electrode is connected to the first channel output via the first touch line, the second touch electrode is connected to the second channel output via the second touch line, the third touch electrode is connected to the third channel output via the third touch line, the fourth touch electrode is connected to the fourth channel output via the fourth touch line,

wherein the first touch electrode is not overlapped with the second touch electrode in the first touch electrode group of the touch electrodes, and the third touch electrode is not overlapped with the fourth touch electrode in the second touch electrode group of the touch electrodes,

wherein the first touch line is not overlapped with the second touch line in a touch screen area of the display panel, the third touch line is not overlapped with the fourth touch line in the touch screen area of the display panel,

wherein the plurality of pixel electrodes of the display panel are respectively connected to the plurality of data channel outputs of the display driver IC via the plurality of data lines.

11. The touch sensitive display device of claim 10, wherein the first touch line and the second touch line are arranged in a same direction in the touch screen area of the display panel, the third touch line and the fourth touch line arranged in a same direction in the touch screen area of the display panel.

12. The touch sensitive display device of claim 10, wherein the display driver IC is configured to supply a common voltage to the plurality of touch electrodes and to respectively supply data voltages to the plurality of pixel electrodes via the plurality of data lines during a display period.

13. The touch sensitive display device of claim 10, wherein the display driver IC is configured to supply a touch scan signal to the plurality of touch electrodes during a touch period,

wherein the display driver IC is configured to supply the touch scan signal to the first touch electrode and the second touch electrode simultaneously during a first part of the touch period, and

wherein the display driver IC is configured to supply the touch scan signal to the third touch electrode and the fourth touch electrode simultaneously during a second part of the touch period.