Method of determining a gate voltage of a display device, and display device

1. A method of determining a gate voltage of a display device, the method comprising:

determining gamma reference voltages including a black data voltage by performing a multi-time programming operation on the display device;

providing copy mura pattern data to the display device;

obtaining a luminance curve of the gate voltage by measuring luminance of the display device while gradually changing the gate voltage;

determining a peak gate voltage corresponding to a peak point of the luminance curve; and

determining a final gate voltage based on the black data voltage and the peak gate voltage.

2. The method of claim 1 , wherein the copy mura pattern data are image data which causes a copy mura defect to occur in the display device when the gate voltage is lower than the peak gate voltage.

3. The method of claim 1 , wherein the copy mura pattern data include black image data representing a 0-gray level with respect to at least one selected from an upper region and a lower region of a display panel of the display device, and image data representing a gray level higher than the 0-gray level with respect to a middle region of the display panel.

4. The method of claim 1 , wherein the luminance curve of the gate voltage is obtained by measuring the luminance of the display device while gradually decreasing the gate voltage by a constant voltage interval from a highest gate voltage.

5. The method of claim 1 , wherein the luminance curve of the gate voltage is obtained by measuring the luminance of the display device while gradually increasing the gate voltage by a constant voltage interval from a lowest gate voltage.

6. The method of claim 1 , wherein the luminance curve of the gate voltage is obtained by using a luminance measuring device, which is used to perform the multi-time programming operation.

7. The method of claim 1 , further comprising:

comparing the peak gate voltage with the black data voltage.

8. The method of claim 7 , wherein the determining the final gate voltage includes:

determining the final gate voltage as a default gate voltage when the peak gate voltage is less than or equal to the black data voltage; and

determining the final gate voltage based on the default gate voltage and a difference between the peak gate voltage and the black data voltage when the peak gate voltage is greater than the black data voltage.

9. The method of claim 8 , wherein the default gate voltage corresponds to a sum of the black data voltage and a default voltage margin.

10. The method of claim 8 , wherein the final gate voltage is determined by adding the difference between the peak gate voltage and the black data voltage to the default gate voltage when the peak gate voltage is greater than the black data voltage.

11. A display device comprising:

a display panel including a plurality of pixels;

a gamma reference voltage generator which generates gamma reference voltages including a black data voltage;

a data driver which provides data voltages to the plurality of pixels based on the gamma reference voltages; and

a gate driver which provides gate signals having a final gate voltage to the plurality of pixels,

wherein the gamma reference voltages are determined by performing a multi-time programming operation on the display device,

wherein copy mura pattern data are provided to the display device, luminance of the display device is measured while gradually changing a gate voltage, and a luminance curve of the gate voltage is obtained, and

wherein the final gate voltage is determined based on the black data voltage and a peak gate voltage corresponding to a peak point of the luminance curve.

12. The display device of claim 11 , wherein the copy mura pattern data are image data which causes a copy mura defect to occur in the display device when the gate voltage is lower than the peak gate voltage.

13. The display device of claim 11 , wherein the copy mura pattern data include black image data representing a 0-gray level with respect to at least one selected from an upper region and a lower region of a display panel of the display device, and image data representing a gray level higher than the 0-gray level with respect to a middle region of the display panel.

14. The display device of claim 11 , wherein the luminance curve of the gate voltage is obtained by measuring the luminance of the display device while gradually decreasing the gate voltage by a constant voltage interval from a highest gate voltage.

15. The display device of claim 11 , wherein the luminance curve of the gate voltage is obtained by measuring the luminance of the display device while gradually increasing the gate voltage by a constant voltage interval from a lowest gate voltage.

16. The display device of claim 11 , wherein the luminance curve of the gate voltage is obtained by using a luminance measuring device which is used to perform the multi-time programming operation.

17. The display device of claim 11 , wherein the final gate voltage is determined by comparing the peak gate voltage with the black data voltage.

18. The display device of claim 17 , wherein the final gate voltage is determined as a default gate voltage when the peak gate voltage is less than or equal to the black data voltage, and

wherein the final gate voltage is determined based on the default gate voltage and a difference between the peak gate voltage and the black data voltage when the peak gate voltage is greater than the black data voltage.

19. The display device of claim 18 , wherein the default gate voltage corresponds to a sum of the black data voltage and a default voltage margin.

20. The display device of claim 18 , wherein the final gate voltage is determined by adding the difference between the peak gate voltage and the black data voltage to the default gate voltage when the peak gate voltage is greater than the black data voltage.