Display device and driving method thereof

1. A display device comprising:

a demultiplexer connected to a first data line and configured to transfer a data signal from the first data line to a plurality of second data lines during a data writing period of one frame;

a compensator calculating an on-pixel ratio (OPR) using input data in the one frame and configured to generate compensation data corresponding to a calculated OPR; and

a data driver configured to supply the data signal to the first data line through the input data during the data writing period, and supply a compensation data signal to the first data line through the compensation data in a blank period of the one frame,

wherein the demultiplexer supplies the compensation data signal from the first data line to a second data line during the blank period.

2. The display device of claim 1 , wherein the demultiplexer includes a plurality of transistors connected to the first data line, and the plurality of transistors are turned on when a control signal is supplied from a demultiplexer controller.

3. The display device of claim 2 , wherein the demultiplexer controller supplies the control signal so that the plurality of transistors are repeatedly turned on during the data writing period, and supplies the control signal so that the compensation data signal is supplied to the second data line, and the plurality of transistors are turned on at least once during the blank period.

4. The display device of claim 3 , wherein the compensator includes:

an on-pixel ratio calculator calculating the OPR;

a compensation data calculator calculating the compensation data corresponding to the OPR; and

a memory unit storing the compensation data.

5. The display device of claim 4 , wherein the compensation data signal is stored in a data capacitor connected to each of the second data lines during the data writing period.

6. The display device of claim 5 , wherein the compensation data signal stored in the data capacitor is supplied to the second data line during the blank period.

7. The display device of claim 6 , further comprising:

a scan driver connected to a plurality of scan lines and configured to supply a scan signal to the plurality of scan lines during the data writing period.

8. The display device of claim 7 , wherein a period in which the scan signal is supplied overlaps a part of a period in which the data signal is supplied.

9. A display device comprising: a demultiplexer connected to a first data line and configured to transfer a data signal from the first data line to a plurality of second data lines in response to a control signal supplied during a data writing period of one frame; a data driver configured to supply the data signal to the first data line during the data writing period; and a demultiplexer controller configured to supply the control signal for controlling a plurality of transistors included in the demultiplexer, wherein the demultiplexer controller supplies the control signal of a high level for turning off the plurality of transistors during a blank period of the one frame, and wherein during the blank period, last data transferred to a second data line during the data writing period is stored in a data capacitor connected to each of the second data lines; wherein the blank period is a period in which the data signal is not transferred to the second data line.

10. The display device of claim 9 , wherein the plurality of transistors are connected to the first data line and the plurality of second data lines, and are turned on when the control signal of a low level is supplied from the demultiplexer controller.

11. The display device of claim 10 , wherein the demultiplexer controller supplies the control signal so that the plurality of transistors are repeatedly turned on during the data writing period.

12. The display device of claim 11 , further comprising: a scan driver connected to a plurality of scan lines and supplying a scan signal to the plurality of scan lines during the data writing period.

13. The display device of claim 12 , wherein a period in which the scan signal is supplied overlaps a part of a period in which the data signal is supplied.

14. A driving method of a display device including a demultiplexer, a compensator, and a data driver, comprising steps of:

transferring a data signal from a first data line to a plurality of second data lines during a data writing period of one frame by the demultiplexer connected to the first data line;

calculating an on-pixel ratio (OPR) through input data in the one frame and configured to generate compensation data corresponding to a calculated OPR by the compensator; and

supplying the data signal to the first data line through the input data during the data writing period and configured to supply a compensation data signal to the first data line using the compensation data during a blank period of the one frame by the data driver,

wherein the demultiplexer supplies the compensation data signal from the first data line to a second data line during the blank period.

15. The driving method of claim 14 , wherein the demultiplexer includes a plurality of transistors connected to the first data line, and

wherein the transferring the data signal from the first data line to the plurality of second data lines is accomplished by turning on the plurality of transistors when a control signal is supplied from a demultiplexer controller.

16. The driving method of claim 15 , wherein the turning on the plurality of transistors when the control signal is supplied includes steps of:

supplying the control signal so that the plurality of transistors are repeatedly turned on by the demultiplexer controller during the data writing period; and

supplying the control signal so that the compensation data signal is supplied to the second data line and the plurality of transistors are turned on at least once during the blank period.