Display device and driving method thereof

1. A display device comprising:

a first common electrode line connected to a first common electrode of a plurality of common electrodes, and formed to overlap a data line formed in a panel where the plurality of common electrodes are formed, wherein

the plurality of common electrodes are separated from each other in a block form, receive a common voltage in an image output period, and receive a touch driving voltage in a touch sensing period; and

a second common electrode separated from the first common electrode line with a protective layer therebetween, and configured to include two second common electrode plates separated from each other on a left and a right side of the first common electrode line.

2. The display device of claim 1 , wherein the two second common electrode plates are connected to each other in at least one area overlapping the first common electrode line.

3. The display device of claim 1 , wherein a separation between the second common electrode plates is less than a width of the first common electrode line.

4. The display device of claim 1 , wherein during the touch sensing period, a plurality of touch driving voltages having a same level are respectively supplied to the plurality of common electrodes including the first and second common electrodes.

5. The display device of claim 1 , wherein,

the plurality of common electrodes comprise:

a plurality of reception electrodes formed in parallel with the data line in a block form, and

a plurality of driving electrode parts disposed between the plurality of reception electrodes, the plurality of driving electrode parts formed in a block form in the panel,

the plurality of driving electrode parts comprise the first and the second common electrodes,

the plurality of driving electrode parts, which are formed in parallel with a gate line formed in the panel, constitute a driving electrode,

the panel comprises a plurality of driving electrodes including the driving electrode, and

the first and second common electrodes are driven differently for each of the plurality of driving electrodes.

6. The display device of claim 1 , wherein,

the plurality of common electrodes comprise:

a plurality of driving electrodes configured to receive the touch driving voltage during the touch sensing period, and

a plurality of reception electrodes configured to receive a sensing signal generated from the touch driving voltage,

during the touch sensing period, a touch driver that generates a selection signal for generating the touch driving voltage determines whether there is a touch, by using a plurality of sensing signals respectively received from the plurality of reception electrodes, and

a display driver generates the touch driving voltage to supply the touch driving voltage to the plurality of driving electrodes and transfers the plurality of sensing signals, respectively received from the plurality of reception electrodes, to the touch driver according to the selection signal.

7. The display device of claim 6 , wherein the display driver generates a maximum value and a minimum value of the touch driving voltage having a pulse type and an intermediate value of the maximum value and the minimum value by using a voltage supplied from a data voltage generator or a voltage supplied from a gate voltage generator, the data voltage generator generating a data voltage supplied to the data line and the gate voltage generator generating a gate voltage supplied to the gate line.

8. The display device of claim 7 , wherein the intermediate value is the same as a reference voltage applied to the plurality of reception electrodes during the touch sensing period.

9. A method of driving a display device, the method comprising:

supplying, during an image output period, a common voltage to a plurality of common electrodes which are separated from each other in a block form in a panel, wherein a plurality of data lines respectively receiving data voltages and a plurality of gate lines receiving a gate voltage are formed in the panel;

supplying, to a driving electrode of the plurality of common electrodes, in a touch sensing section of a touch sensing period, a touch driving voltage, having a maximum value and a minimum value, the maximum and the minimum values being generated from a voltage supplied from a data voltage generator generating the data voltages or from a gate voltage generator generating the gate voltage,

supplying, to the driving electrode, in a touch non-sensing section of the touch sensing period, an intermediate value of the maximum value and the minimum value; and

determining whether there is a touch in the touch sensing section, by using a sensing signal received from a reception electrode of the plurality of common electrodes.

10. The method of claim 9 , wherein during the touch sensing period, a reference voltage having the same value as the intermediate value is applied to the reception electrode.