Liquid crystal display device and method for operating the same

1. A liquid crystal display (LCD), comprising:

an LCD panel having a plurality of gate lines running in parallel in one direction and a plurality of data lines running in parallel perpendicular to the gate lines;

gate input drivers to provide gate signals to the gate lines of the LCD panel;

data input drivers to provide data signals to the data lines of the LCD panel; and

a back light unit on a lower part of the LCD panel having a light guide plate and at least two light emitting elements in the same plane with the light guide plate on opposite sides of the light guide plate, wherein the at least two light emitting elements are turned on and off alternately with respect to each other.

2. The LCD according to claim 1 , wherein the LCD panel is divided into at least one picture region for displaying a picture signal, and at least one black region for displaying a black signal at a time point.

3. The LCD according to claim 2 , wherein a boundary between the picture region and the at least one black region on the LCD panel displayed at a point in time is parallel to the gate lines.

4. The LCD according to claim 3 , wherein the picture region and the black region displayed on the LCD panel appears to move in a vertical direction across the LCD panel at subsequent points in time.

5. The LCD according to claim 2 , wherein the light emitting element most adjacent to the picture region is turned on while the other light emitting element is turned off.

6. The LCD according to claim 2 , wherein a light emitting element on a side of the LCD panel having relatively more of the picture region than another side of the LCD panel is turned on, and a light emitting element on a side of the LCD panel having relatively less of the picture region than the other side of the LCD panel is turned off.

7. A method of operating an LCD, comprising the steps of:

providing a first gate signal to a plurality of gate lines sequentially, and a second gate signal to the plurality of the gate lines sequentially after a set time period from the first gate signal within a frame period;

providing picture data signals to a plurality of pixels in synchronization with the first gate signals provided to the plurality of pixels;

providing black data signals to the plurality of pixels in synchronization with the second gate signals provided to the plurality of pixels; and

controlling at least two light emitting elements that are spaced apart from each other and on the same plane in a lower part of the LCD panel such that the at least two light emitting elements are turned on and off alternately with respect to each other.

8. The method according to claim 7 , wherein the LCD panel is divided into at least one picture region for displaying a picture signal from the picture data signals and at least one black region for displaying a black signal from the black data signals at a point in time.

9. The method according to claim 8 , wherein a boundary between the picture region and the black region the LCD panel displays at a point in time is parallel to the gate lines.

10. The method according to claim 8 , wherein the picture region and the black region displayed on the LCD panel move in a vertical direction at subsequent points in time.

11. The method according to claim 8 , wherein the light emitting element most adjacent to the picture region is turned on while the other light emitting element is turned off.

12. The method according to claim 8 , wherein a light emitting element on a side of the LCD panel having relatively more of the picture region than another side of the LCD panel is turned on, and a light emitting element on a side of the LCD panel having relatively less of the picture region than the other side of the LCD panel is turned off.

13. The method according to claim 7 , further comprising the step of adjusting the set time period such that a ratio of a size of picture region to the black region on the LCD panel is changed for subsequent points in time.

14. A liquid crystal display (LCD), comprising:

an LCD panel having a plurality of gate lines running in parallel in one direction and a plurality of data lines running in parallel perpendicular to the gate lines;

gate input drivers to provide gate signals to the gate lines of the LCD panel;

data input drivers to provide data signals to the data lines of the LCD panel;

a back light unit on a lower part of the LCD panel having a light guide plate and at least two light emitting elements in the same plane with the light guide plate on opposite sides of the light guide plate; and

means for controlling the at least two light emitting elements such that the at least two light emitting elements are turned on and off alternately with respect to each other.

15. The LCD according to claim 14 , wherein the LCD panel is divided into at least one picture region for displaying a picture signal, and at least one black region for displaying a black signal at a time point.

16. The LCD according to claim 14 , wherein a boundary between the picture region and the at least one black region on the LCD panel displayed at a point in time is parallel to the gate lines.

17. The LCD according to claim 14 , wherein the picture region and the black region displayed on the LCD panel appears to move in a vertical direction across the LCD panel at subsequent points in time.