Display apparatus and method of driving the same

1. A display apparatus comprising:

a display panel;

a gamma reference voltage generator configured to generate a gamma reference voltage and including a gamma amplifier configured to output the gamma reference voltage; and

a data driver configured to generate a data voltage based on the gamma reference voltage and to output the data voltage to the display panel,

wherein a polarity of an offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames such that the polarity of the offset voltage of the gamma amplifier is inverted in the unit of one frame in a first time period, and the polarity of the offset voltage of the gamma amplifier is inverted in the unit of two frames in a second time period different from the first time period.

2. The display apparatus of claim 1 , wherein a polarity of the data voltage is inverted in a unit of one frame.

3. The display apparatus of claim 2 , wherein the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the second polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

4. The display apparatus of claim 2 , wherein the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

5. The display apparatus of claim 2 , wherein one frame inversion of the polarity of the offset voltage and two frame inversion of the polarity of the offset voltage are randomly performed over a plurality of frames.

6. The display apparatus of claim 1 , wherein one data line is alternately connected to pixels disposed in two pixel columns in the display panel.

7. The display apparatus of claim 6 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of two horizontal lines, and the polarity of the offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames.

8. The display apparatus of claim 7 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of two horizontal lines, and the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

9. The display apparatus of claim 1 , wherein one data line is connected to pixels disposed in one pixel column in the display panel.

10. The display apparatus of claim 9 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of two horizontal lines, and the polarity of the offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames.

11. The display apparatus of claim 10 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of two horizontal lines, and the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

12. The display apparatus of claim 9 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of one horizontal line, and the polarity of the offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames.

13. The display apparatus of claim 12 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of one horizontal line, and the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

14. A display apparatus comprising:

a display panel;

a gamma reference voltage generator configured to generate a gamma reference voltage and including a gamma amplifier configured to output the gamma reference voltage; and

a data driver configured to generate a data voltage based on the gamma reference voltage and to output the data voltage to the display panel,

wherein a polarity of an offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames,

wherein one data line is alternately connected to pixels disposed in four pixel columns in the display panel.

15. The display apparatus of claim 14 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of four horizontal lines, and the polarity of the offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames.

16. The display apparatus of claim 15 , wherein the polarity of the offset voltage of the gamma amplifier is inverted in a unit of four horizontal lines, and the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

17. A method of driving a display apparatus, the method comprising:

generating a gamma reference voltage;

outputting, using a gamma amplifier, the gamma reference voltage to a data driver;

generating a data voltage based on the gamma reference voltage; and

outputting the data voltage to a display panel,

wherein a polarity of an offset voltage of the gamma amplifier is inverted alternately in a unit of one frame and in a unit of two frames such that the polarity of the offset voltage of the gamma amplifier is inverted in the unit of one frame in a first time period, and the polarity of the offset voltage of the gamma amplifier is inverted in the unit of two frames in a second time period different from the first time period.

18. The method of claim 17 , wherein a polarity of the data voltage is inverted in a unit of one frame.

19. The method of claim 18 , wherein the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the second polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.

20. The method of claim 18 , wherein the offset voltage of the gamma amplifier has a first polarity in a first frame, a second polarity in a second frame, the second polarity in a third frame, the first polarity in a fourth frame, the first polarity in a fifth frame, the second polarity in a sixth frame and the first polarity in a seventh frame, wherein the second polarity is different from the first polarity.