Liquid crystal display and pre-charging method thereof

1. A liquid crystal display device, comprising:

a liquid crystal display panel including a pixel matrix for displaying a picture;

a data driving circuit for applying video signals to the liquid crystal display panel;

a static electricity proof circuit in the liquid crystal display panel and connected to a plurality of video lines receiving the video signals from the data driving circuit, for supplying the video lines with a pre-charge voltage in a pre-charge time interval while shutting off static electricity in the remaining time interval; and

a plurality of demultiplexers in the liquid crystal display panel, for pre-charging the pre-charge voltage supplied via the video lines into data lines of the pixel matrix in the pre-charge time interval while making a time-divisional driving of the data lines to apply the video signals in a charge time interval of the video signals,

wherein the data driving circuit floats the video lines in the pre-charge time interval, wherein a supplying time of the pre-charge voltage is synchronized with a floating time of the video lines.

2. The liquid crystal display device according to claim 1 , wherein the static electricity proof circuit includes:

first and second diodes connected, in series, between first and second power lines.

3. The liquid crystal display device according to claim 2 , wherein the first and second power lines commonly supply the pre-charge voltage in the pre-charge time interval while supply first and second supply voltages in the remaining time interval,

wherein a node between the first and second diodes is connected to one of the video lines.

4. The liquid crystal display device according to claim 3 , wherein the first and second supply voltages are respectively higher and lower than the pre-charge voltage.

5. The liquid crystal display device according to claim 2 , wherein the first and second diodes are turned on by the pre-charge voltage to thereby supply the pre-charge voltage to the floated video lines.

6. The liquid crystal display device according to claim 1 , wherein the pre-charge voltage is identical to a common voltage supplied to the pixel matrix.

7. A liquid crystal display device, comprising:

a liquid crystal display panel including a pixel matrix for displaying a picture;

a data driving circuit for applying video signals to the liquid crystal display panel;

a plurality of demultiplexers in the liquid crystal display panel, for floating data lines of the pixel matrix in a pre-charge time interval while making a time division of the data lines to apply the video signals via video lines in a charge time interval of the video signals; and

a static electricity proof circuit for pre-charging a pre-charge voltage into the floated data lines in the pre-charge time interval while shutting off static electricity in the remaining time interval, wherein a pre-charging time of the pre-charge voltage is synchronized with a floating time of the data lines.

8. The liquid crystal display device according to claim 7 , wherein the static electricity proof circuit includes:

first and second diodes connected, in series, between first and second power lines.

9. The liquid crystal display device according to claim 8 , wherein the first and second power lines commonly supply the pre-charge voltage in the pre-charge time interval while supply first and second supply voltages in the remaining time interval,

wherein a node between the first and second diodes is connected to one of the data lines.

10. The liquid crystal display device according to claim 9 , wherein the first and second supply voltages are respectively higher and lower than the pre-charge voltage.

11. The liquid crystal display device according to claim 8 , wherein the first and second diodes are turned on by the pre-charge voltage to thereby supply the pre-charge voltage to the floated data lines.

12. The liquid crystal display device according to claim 7 , wherein the pre-charge voltage is identical to a common voltage supplied to the pixel matrix.

13. A method of pre-charging a liquid crystal display device including a pixel matrix for displaying a picture, comprising the steps of:

floating video lines receiving video signals using a data driving circuit in a pre-charge time interval;

supplying a pre-charge voltage to the video lines floated using a static electricity proof circuit connected to the video lines;

pre-charging the pre-charge voltage supplied via the video lines into data lines of the pixel matrix using a plurality of demultiplexers in the pre-charge time interval; and

making a time-divisional driving of the data lines to apply the video signals using the demultiplexers in a charge time interval of the video charge,

wherein a supplying time of the pre-charge voltage is synchronized with a floating time of the video lines.

14. The method according to claim 13 , wherein the static electricity proof circuit is turned on by the pre-charge voltage being lower than a first supply voltage but higher than a second supply voltage in the pre-charge time interval, thereby supplying the pre-charge voltage.

15. A method of pre-charging a liquid crystal display device, comprising the steps of:

floating data lines using a plurality of demultiplexers in a pre-charge time interval;

pre-charging a pre-charge voltage into the data lines floated using a static electricity proof circuit in the pre-charge time interval; and

making a time-divisional driving of the data lines to apply the video signals using the demultiplexers in a charge time interval of the video signals,

wherein the pre-charging time of the pre-charge voltage is synchronized with the floating time of the data lines.

16. The method according to claim 15 , wherein the static electricity proof circuit is turned on by the pre-charge voltage being lower than a first supply voltage but higher than a second supply voltage in the pre-charge time interval, thereby supplying the pre-charge voltage.