Liquid crystal display device including a data analysis unit and method for driving the same

1. A liquid crystal display device, comprising:

a data analysis unit to analyze image data of an input image data stream for variation of luminance between the image data in order to determine whether or not to insert a black data;

a black data processing unit to insert the black data into the input image data stream based on the comparison of the variation of luminance of the image data corresponding to an each pixel analyzed by the data analysis unit and to output an output image data stream with the black data or output an output image data stream without the black data; and

a liquid crystal panel to display images based on the output image data stream output from the black data processing unit,

wherein when a gray level difference between the image data of a current frame and the image data of an next frame is greater than a preset gray level difference, the black data is inserted as a preceding frame right before a change of the gray level of the image data; and

wherein the input image data stream is driven at a frequency of 60 Hz, and the insertion of the black data into the input image data stream causes the output image data stream to be driven at a frequency only slightly higher than 60 Hz,

wherein the black data is inserted as an entire frame.

2. The liquid crystal display device of claim 1 , wherein the black data is image data having a lowest gray level.

3. The liquid crystal display device of claim 1 , wherein the variation of luminance is a luminance difference between two consecutive frames.

4. The liquid crystal display device of claim 1 , wherein the black data of at least one pixel is inserted for the entire frame.

5. The liquid crystal display device of claim 1 , wherein the black data is inserted for each pixel, respectively.

6. The liquid crystal display device of claim 1 , wherein the black data is inserted after a last frame of the image data whose gray level has not yet changed.

7. A method of driving a liquid crystal display device including a liquid crystal panel having a plurality of pixels arranged thereon, comprising the steps of:

comparing a luminance of an image data in an input image data stream to determine a variation of luminance between the image data and determine whether or not to insert a black data;

inserting the black data into the input image data stream, or not, based on the comparison of the variation of luminance of the image data corresponding to an each pixel from the comparing step,

wherein when a gray level difference between the image data of a current frame and the image data of an next frame is greater than a preset gray level difference, the black data is inserted as a preceding frame right before a change of the gray level of the image data;

outputting an output image data stream with the black data from the inserting step or outputting an output image data stream without the black data; and

displaying images on the liquid crystal panel based on the output image data stream,

wherein the input image data stream is driven at a frequency of 60 Hz, and the insertion of the black data into the input image data stream causes the output image data stream to be driven at a frequency only slightly higher than 60 Hz,

wherein the black data is inserted as an entire frame.

8. The method of claim 7 , wherein the black data is image data having a lowest gray level.

9. The method of claim 7 , wherein the variation of luminance is a luminance difference between two consecutive frames.

10. The method of claim 7 , wherein the black data of at least one pixel is inserted for the entire frame.

11. The method of claim 7 , wherein the black data is inserted for each pixel, respectively.

12. The method of claim 7 , wherein the black data is inserted after a last frame of the image data whose gray level has not yet changed.

13. The method of claim 7 , wherein the image data for at least one frame in the input image data stream is the same as the image data for at least one frame in the output image data stream.