Display device having first and second switches controlling first and second driving power sources respectively and method of driving the same

1 . A display device comprising:

pixels connected to scan lines, data lines, and sensing lines;

a power supply which supplies a first driving power source to a first power line, supplies a second driving power source to a second power line, and supplies a third driving power source to a third power line;

first switches located on pixel rows, respectively; and

second switches located on the pixel rows, respectively,

wherein a first switch located on an i-th pixel row among the first switches is connected between pixels located on the i-th pixel row and the first power line, and a second switch located on the i-th pixel row among the second switches is connected between the pixels located on the i-th pixel row and the second power line,

wherein i is a natural number,

wherein the first switch and the second switch, which are located on the i-th pixel row, are alternately turned on and turned off;

wherein, during a display period, in which an image is displayed by the pixels, the first switches are turned on, and the second switches are turned off; and

wherein, during a sensing period, in which the pixels located on the i-th pixel row are sensed, the first switch located on the i-th pixel row is turned off, and the second switch located on the i-th pixel row is turned on, the sensing period including a first period, in which sensing data is sensed corresponding to a sensing voltage from the pixels located on the i-th pixel row, and including a second period, in which a data signal before the sensing period is re-supplied.

2 . The display device of claim 1 , wherein the display period is an active period included in one frame period.

3 . The display device of claim 1 , wherein the power supply supplies the second driving power source to the second power line during the sensing period, and sets the second power line to a floating state during the display period.

4 . The display device of claim 1 , wherein, during the sensing period, in which the pixels located on the i-th pixel row are sensed, first switches located on the other pixel rows except the i-th pixel row are in a turn-on state, and second switches located on the other pixel rows are in a turn-off state.

5 . The display device claim 1 , wherein the sensing period is a vertical blank period included in one frame period.

6 . The display device claim 1 , further comprising:

a data driver which supplies a data signal to the data lines during the display period, and supplies a voltage of a reference power source to the data lines during the sensing period;

a scan driver which supplies a scan signal to the scan lines;

a sensing unit connected to sensing lines, wherein the sensing unit generates sensing data, corresponding to a sensing voltage supplied from the pixels located on the i-th pixel row during the sensing period, in which the pixels located on the i-th pixel row are sensed; and

a timing controller which generates output data by correcting input data from an outside, using the sensing data.

7 . The display device of claim 6 , wherein the timing controller controls turn-on and turn-off of the first switches and the second switches using a switch control signal supplied thereto.

8 . A display device comprising:

pixels connected to scan lines, data lines, and sensing lines, wherein each of the pixels includes a first switch and a second switch; and

a power supply which supplies a first driving power source to a first power line, supplies a second driving power source to a second power line, and supplies a third driving power source to a third power line,

wherein the first switch included in each of the pixels is connected to the first power line, and the second switch included in each of the pixels is connected to the second power line,

wherein, during a display period, in which the pixels display an image, the first switch included in each of the pixels is in a turn-on state, and the second switch included in each of the pixels is in a turn-off state; and

wherein, during a sensing period, in which the pixels located on the i-th pixel row are sensed, the first switch located on the i-th pixel row is turned off, and the second switch located on the i-th pixel row is turned on the sensing period including a first period, in which sensing data is sensed corresponding to a sensing voltage from the pixels located on the i-th pixel row, and including a second period, in which a data signal before the sensing period is re-supplied.

9 . The display device of claim 8 , wherein, during a sensing period in which pixels located on an i-th pixel row are sensed, the first switch included in each of pixels located on the i-th pixel row is in a turn-off state, and the second switch included in each of the pixels located on the i-th pixel row is in a turn-on state, wherein i is a natural number.

10 . The display device of claim 9 , wherein the display period is an active period included in one frame period, and the sensing period is a vertical blank period included in the one frame period.

11 . The display device of claim 9 , wherein the power supply supplies the second driving power source to the second power line during the sensing period, and sets the second power line to a floating state during the display period.

12 . The display device of claim 9 , further comprising:

a data driver which supplies a data signal to the data lines during the display period, and supplies a voltage of a reference power source to the data lines during the sensing period;

a scan driver which supplies a scan signal to the scan lines;

a sensing unit which generates sensing data, corresponding to a sensing voltage supplied from the pixels located on the i-th pixel row during the sensing period; and

a timing controller which generates output data by correcting input data input from an outside, using the sensing data.

13 . The display device of claim 12 , wherein the timing controller controls turn-on and turn-off of the first switch and the second switch by supplying a switch control signal thereto.

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

supplying a voltage of a first driving power source to a driving transistor included in each of pixels via a first power line during a display period such that during the display period, a first switch included in each of the pixels is in a turn-on state, and a second switch included in each of the pixels is in a turn-off state; and

supplying a voltage of a second driving power source different from the first driving power source to the driving transistor included in each of the pixels via a second power line during a sensing period; and

during a sensing period, in which the pixels located on the i-th pixel row are sensed, turning off the first switch located on the i-th pixel row, and turning on the second switch located on the i-th pixel row the sensing period including a first period, in which sensing data is sensed corresponding to a sensing voltage from the pixels located on the i-th pixel row, and including a second period, in which a data signal before the sensing period is re-supplied.

15 . The method of claim 14 , wherein the second power line is set to a floating state during the display period.

16 . The method of claim 14 , wherein the display period is an active period included in one frame period, and the sensing period is a vertical blank period included in the one frame period.

17 . The method of claim 14 , further comprising:

generating output data by correcting input data, corresponding to sensing data generated from the pixels during the sensing period; and

generating a data signal using the output data, and supplying the data signal to the pixels during the display period.