Integrated touch display device for displaying image and performing touch sensing through time-divisional multiplexing

• US 9,830,025 B2
• Filed: 12/09/2013
• Issued: 11/28/2017
• Est. Priority Date: 09/04/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Han, Man Hyeop, Kim, Cheol Se, Kim, Ju Han, Hwang, Sang Soo
• Primary Examiner(s): Yang, Kwang-Su
• Application Number:
  US14/101,059
• Publication Number:
  US 20150062062A1
• Time in Patent Office: 1,450 Days
• Field of Search: 345174
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

Disclosed is a display device integrated with a touch screen. The display device includes a panel configured to include a plurality of first electrodes arranged in parallel in a first direction and a plurality of second electrodes arranged in parallel in a second direction, a switching unit configured to apply a common voltage to the plurality of first and second electrodes when the panel operates in a display driving mode, and when the panel operates in a touch driving mode, apply a first touch scan pulse to the plurality of first electrodes during a first period, and apply a second touch scan pulse to the plurality of first and second electrodes during a second period, a first touch sensing unit configured to apply the first touch scan pulse to the switching unit, and a second touch sensing unit configured to apply the second touch scan pulse to the switching unit.

Claims

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

a panel comprising a plurality of first electrodes arranged in parallel and in a first direction, and a plurality of second electrodes arranged in parallel and in a second direction;

a switching unit configured to (i) apply a common voltage to the plurality of first electrodes and the plurality of second electrodes, during a display driving period of a frame, (ii) group the plurality of first electrodes in units of at least two electrodes and apply a first touch scan pulse to the grouped first electrodes during a first touch sensing period of the frame for sensing a user'"'"'s finger touch on the panel, and (iii) individually apply a second touch scan pulse to the plurality of first electrodes and the plurality of second electrodes during a second touch sensing period of the frame for sensing a pen touch on the panel;

a first touch sensing unit configured to apply the first touch scan pulse to the switching unit; and

a second touch sensing unit configured to apply the second touch scan pulse to the switching unit,

wherein the switching unit comprises;

a first touch sensing unit connector configured to group the plurality of first electrodes in units of at least two electrodes to connect the grouped first electrodes to the first touch sensing unit and group the plurality of second electrodes in units of two electrodes to connect the grouped second electrodes to the first touch sensing unit;

a second touch sensing unit connector configured to individually connect the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit; and

a switch configured to connect the plurality of first electrodes and the plurality of second electrodes to the first touch sensing unit connector during the first touch sensing period and configured to connect the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit connector during the second touch sensing period.

2. The display device of claim 1,

wherein the switching unit receives a plurality of first touch sensing signals from the grouped second electrodes, and transfers the plurality of first touch sensing signals to the first touch sensing unit during the first touch sensing period, and

wherein the first touch sensing unit determines whether there is a touch by using the plurality of first touch sensing signals.

3. The display device of claim 1,

wherein the switching unit receives a plurality of second touch sensing signals from the plurality of first electrodes and the plurality of second electrodes individually, and transfers the plurality of second touch sensing signals to the second touch sensing unit individually during the second touch sensing period, and

wherein the second touch sensing unit determines whether there is a touch by using the plurality of second touch sensing signals.

4. The display device of claim 1, wherein the first touch sensing unit and the second touch sensing unit are comprised in one touch integrated circuit.

5. The display device of claim 1, wherein the first touch sensing unit and the second touch sensing unit are comprised in one touch integrated circuit and the switching unit is comprised in the one touch integrated circuit.

6. The display device of claim 1, wherein the first touch sensing unit and the second touch sensing unit are comprised in different touch integrated circuits, respectively.

7. The display device of claim 1, wherein the first touch sensing unit and the second touch sensing unit sense a touch in different types including a mutual capacitive type and a self-capacitive type within the frame.

8. The display device of claim 1, wherein the switching unit is comprised in a display driver integrated circuit that applies data voltages to the panel.

9. A touch integrated circuit comprising:

a switching unit configured to (i) output a common voltage to a plurality of first electrodes and a plurality of second electrodes that are comprised in a panel during a display driving period of a frame, (ii) group the plurality of first electrodes in units of at least two electrodes and output a first touch scan pulse to the grouped first electrodes during a first touch sensing period of the frame for sensing a user'"'"'s finger touch on the panel and (iii) individually output a second touch scan pulse to the plurality of first electrodes and the plurality of second electrodes during a second touch sensing period of the frame for sensing a pen touch on the panel;

a first touch sensing unit configured to apply the first touch scan pulse to the switching unit; and

a second touch sensing unit configured to apply the second touch scan pulse to the switching unit,

wherein the switching unit comprises;

a first touch sensing unit connector configured to group the plurality of first electrodes in units of at least two electrodes to connect the grouped first electrodes to the first touch sensing unit and group the plurality of second electrodes in units of two electrodes to connect the grouped second electrodes to the first touch sensing unit;

a second touch sensing unit connector configured to individually connect the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit; and

a switch configured to connect the plurality of first electrodes and the plurality of second electrodes to the first touch sensing unit connector during the first touch sensing period and configured to connect the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit connector during the second touch sensing period.

10. The touch integrated circuit of claim 9, wherein the first touch sensing unit and the second touch sensing unit sense a touch in different types including a mutual capacitive type and a self-capacitive type within the frame.

11. The touch integrated circuit of claim 9,

wherein the switching unit receives a plurality of first touch sensing signals from the grouped second electrodes, and transfers the plurality of first touch sensing signals to the first touch sensing unit during the first touch sensing period, and

wherein the first touch sensing unit determines whether there is a touch by using the plurality of first touch sensing signals.

12. The touch integrated circuit of claim 9,

wherein the switching unit receives a plurality of second touch sensing signals from the plurality of first electrodes and the plurality of second electrodes individually, and transfers the plurality of second touch sensing signals to the second touch sensing unit individually during the second touch sensing period, and

wherein the second touch sensing unit determines whether there is a touch, by using the plurality of second touch sensing signals.

13. A display device integrated with a touch screen, the display device comprising:

a panel comprising a plurality of first electrodes arranged in parallel and in a first direction, and a plurality of second electrodes arranged in parallel and in a second direction;

a switching unit configured to (i) apply a common voltage to the plurality of first electrodes and the plurality of second electrodes, during a display driving period of a frame, (ii) group the plurality of first electrodes in units of at least two electrodes and apply a first touch scan pulse to the grouped first electrodes during a first touch sensing period of the same frame at a first touch sensing size, and (iii) individually apply a second touch scan pulse to the plurality of first electrodes and the plurality of second electrodes during a second touch sensing period of the same frame at a second touch sensing size smaller than the first touch sensing size;

a first touch sensing unit configured to apply the first touch scan pulse to the switching unit; and

a second touch sensing unit configured to apply the second touch scan pulse to the switching unit,

wherein a plurality of first sub-electrodes are connected to each other to configure one first electrode and the plurality of first sub-electrodes are electrically connected to each other in a non-display area of the panel.

14. The display device of claim 13, wherein the switching unit connects the grouped first electrodes to the first touch sensing unit during the first touch sensing period and groups the plurality of second electrodes in units of at least two electrodes to connect the grouped second electrodes to the first touch sensing unit during the first touch sensing period.

15. The display device of claim 13,

wherein the switching unit is further configured to group the plurality of second electrodes in units of at least two electrodes during the first touch sensing period,

wherein the switching unit receives a plurality of first touch sensing signals from the grouped second electrodes, and transfers the plurality of first touch sensing signals to the first touch sensing unit during the first touch sensing period, and

wherein the first touch sensing unit determines whether there is a touch by using the plurality of first touch sensing signals.

16. The display device of claim 15,

wherein the switching unit receives a plurality of second touch sensing signals from the plurality of first electrodes and the plurality of second electrodes individually, and transfers the plurality of second touch sensing signals to the second touch sensing unit individually during the second touch sensing period, and

wherein the second touch sensing unit determines whether there is a touch by using the plurality of second touch sensing signals.

17. The display device of claim 13, wherein the switching unit individually connects the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit during the second touch sensing period.

18. The display device of claim 13, wherein the first touch sensing unit and the second touch sensing unit are comprised in one touch integrated circuit and the switching unit is comprised in the one touch integrated circuit.

19. The display device of claim 13, wherein the first touch sensing unit and the second touch sensing unit sense a touch in different types including a mutual capacitive type and a self-capacitive type within the frame.

20. The display device of claim 13, wherein the second touch sensing unit senses a pen touch on the panel.

21. A touch integrated circuit comprising:

a switching unit configured to (i) output a common voltage to a plurality of first electrodes and a plurality of second electrodes that are comprised in a panel during a display driving period of a frame, (ii) group the plurality of first electrodes in units of at least two electrodes and output a first touch scan pulse to the grouped first electrodes during a first touch sensing period of the same frame at a first touch sensing size, and (iii) individually output a second touch scan pulse to the plurality of first electrodes and the plurality of second electrodes during a second touch sensing period of the same frame at a second touch sensing size smaller than the first touch sensing size;

a first touch sensing unit configured to apply the first touch scan pulse to the switching unit; and

a second touch sensing unit configured to apply the second touch scan pulse to the switching unit,

wherein a plurality of first sub-electrodes are connected to each other to configure one first electrode and the plurality of first sub-electrodes are electrically connected to each other in a non-display area of the panel.

22. The touch integrated circuit of claim 21, wherein the switching unit connects the grouped first electrodes to the first touch sensing unit during the first touch sensing period and groups the plurality of second electrodes in units of at least two electrodes to connect the grouped second electrodes to the first touch sensing unit during the first touch sensing period.

23. The touch integrated circuit of claim 21, wherein the switching unit individually connects the plurality of first electrodes and the plurality of second electrodes to the second touch sensing unit during the second touch sensing period.