Method and apparatus for compensating data voltage and display device

1. A method for compensating data voltage in a display device, comprising the following steps of:

determining whether a current frame is identical to a previous one frame;

outputting a compensation voltage to compensate data voltage of the current frame if the current frame is identical to that previous one frame, the step of outputting compensation voltages to compensate data voltages in the current frame further comprising steps of:

calculating a difference value of a maximal gray level and a minimal gray

level of all the pixel units connected to the same data line;

judging whether the difference value is larger than a critical value; and if the difference value is larger than the critical value, outputting compensation voltages corresponding to all the pixel units connected to the data line to compensate the data voltages of all the pixels connected to the data line; and

outputting information about the frame according to the compensated data voltage.

2. The method for compensating data voltage according to claim 1 , wherein the compensation voltage is adjusted by an amount of the leakage current of a thin film transistor and a collected crosstalk value of a display panel after compensation, so that the crosstalk of the compensated data voltage is minimal.

3. The method for compensating data voltage according to claim 2 , wherein the data voltage is compensated by increasing or decreasing the data voltage with an amount of the compensation voltage.

4. The method for compensating data voltage according to claim 1 , wherein the step of determining whether the current frame is identical to the previous one frame comprises steps of:

determining whether a gray level of each of the pixel units in the current frame is identical to that of the corresponding pixel units in the previous one frame; and

determining that the current frame is identical to that of the previous one frame if they are identical to each other.

5. The method for compensating data voltage according to claim 4 , wherein the step of determining whether the gray level of each of the pixel units in the current frame is identical to that of the corresponding pixel units in the previous one frame comprises steps of:

determining whether an absolute value of a voltage difference between pixel electrodes and the common electrode for each of the pixel units in the current frame and for the corresponding pixel units in the previous one frame; and

determining that the current frame is identical to that of the previous one frame if they are identical to each other.

6. The method for compensating data voltage according to claim 1 , wherein the step of outputting the compensation voltage to compensate the data voltage comprises steps of:

outputting compensation voltages corresponding to each of the pixel units in the current frame to compensate data voltages of all the pixel units in the current frame.

7. The method for compensating data voltage according to claim 1 , wherein the step of calculating the difference value of a maximal gray level and a minimal gray level of all the pixel units connected to the same data line comprises steps of:

determining gray levels of all the pixel units according to the absolute value of the voltage difference between the common electrode and the pixel electrodes in all the pixels units connected to the same data line; and

calculating difference values between the maximal gray level and the minimal gray level.

8. The method for compensating data voltage according to claim 1 , wherein the magnitude of the compensation voltage corresponding to each of the pixel units is set according to the amount of the leakage current of the thin film transistor contained in the pixel unit, and the larger the leakage current of the thin film transistor is, the larger the compensation voltage corresponding to the pixel units is.

9. A method for compensating data voltage in a display device, comprising:

determining whether a current frame is identical lo a previous one frame:

outputting a compensation voltage to compensate data voltage of the current frame if the current frame is identical to that previous one frame, wherein the step of outputting compensation voltages to compensate data voltages in the current frame comprises steps of:

calculating a difference value of a maximal gray level and a minimal gray level of all the pixel units connected to the same data line;

judging whether the difference value is larger than a critical value; and if the difference value is larger than the critical value, outputting compensation voltages corresponding to the pixel units connected to the data line except the pixel units with the minimal gray level to compensate the data voltages of the pixels connected lo the data line except the pixel unit with the minimal gray level, and

outputting information about the frame according to the compensated data voltage.

10. The method for compensating data voltage according to claim 9 , wherein the the step of calculating the difference value of a maximal gray level and a minimal gray level of all the pixel units connected to the same data line comprises steps of:

determining gray levels of all the pixel units according to the absolute value of the voltage difference between the common electrode and the pixel electrodes in all the pixels units connected to the same data line; and

calculating difference values between the maximal gray level and the minimal gray level.

11. An apparatus for compensating data voltage in a display device, wherein the apparatus for compensating data voltage comprises at least one processor and computer-readable memory encoded with instructions to control the at least one processor to:

determine whether a current frame is identical to a previous one frame; when the current frame is identical to the previous one frame, calculate a difference value of a maximal gray level and a minimal gray level of all the pixel units connected to a same data line, judge whether the difference value is larger than a critical value; and if the difference value is larger then the critical value, and output compensation voltages corresponding to all the pixel units connected to the data line to compensate the data voltages of all the pixels connected to the data line; and

output information about the frame according to the compensated data voltage.

12. A display device comprising the apparatus for compensating data voltage according to claim 11 .

13. The apparatus for compensating data voltage according to claim 11 , wherein the compensation voltage is adjusted by an amount of the leakage current of a thin film transistor and a collected crosstalk value of a display panel after compensation, so that the crosstalk of the compensated data voltage is minimal.

14. The apparatus for compensating data voltage according to claim 11 , wherein the data voltage is compensated by increasing or decreasing the data voltage with an amount of the compensation voltage.

15. The apparatus for compensating data voltage according to claim 11 , wherein the apparatus determines whether a gray level of each of the pixel units in the current frame is identical to that of the corresponding pixel units in the previous one frame; and if they are identical to each other, it is determined that the current frame is identical to that of the previous one frame.

16. The apparatus for compensating data voltage according to claim 11 , wherein the instructions are further configured to determine whether an absolute value of a voltage difference between pixel electrodes and the common electrode for each of the pixel units in the current frame and for the corresponding pixel units in the previous one frame; and if they are identical to each other, it is determined that the current frame is identical to that of the previous one frame.

17. The apparatus for compensating data voltage according to claim 11 , wherein the instructions are further configured to output compensation voltages corresponding to each of the pixel units in the current frame to compensate data voltages of all the pixel units in the current frame.

18. An apparatus for compensating data voltage in a display device, wherein the apparatus for compensating data voltage comprises at least one processor and computer-readable memory encoded with instructions to control the at least one processor to:

determine whether a current frame is identical to a previous one frame; calculate a difference value of a maximal gray level and a minimal gray level of all the pixel units connected to a same data line and judge whether the difference value is larger than a critical value; and if the difference value is larger than the critical value, output compensation voltage corresponding to the pixel units connected to the data line except the pixel units with the minimal gray level to compensate the data voltage of the pixels connected to the data line except the pixel unit with the minimal gray level; and

output information about the frame according to the compensated data voltage.