Liquid crystal display device and method for driving the same

Abstract

A liquid crystal display device includes a data analysis unit to analyze image data of an input image data stream for variation of luminance between the image data, a black data processing unit to insert black data into the input image data stream based on the variation of luminance analyzed by the data analysis unit and to output an output image data stream, and a liquid crystal panel to display images based on the output image data stream output from the black data processing unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1A is an illustrative view showing image signals applied to a cathode ray tube according to a related art;

FIG. 1B is an illustrative view showing image signals applied to a liquid crystal display device according to a related art;

FIG. 2A is an illustrative view showing an image data applied to a unit pixel in imitation of impulse driving in a liquid crystal display device according to the related art;

FIG. 2B is an illustrative view showing black data adapted to a continuous image signal according to the related art;

FIG. 3 is a block diagram showing a liquid crystal display device in accordance with an exemplary embodiment of the present invention; and

FIG. 4 is an illustrative view showing image data in accordance with a second exemplary embodiment of the present invention.

Claims

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;a black data processing unit to insert black data into the input image data stream based on the variation of luminance analyzed by the data analysis unit and to output an output image data stream; anda liquid crystal panel to display images based on the output image data stream output from the black data processing unit.

2. The liquid crystal display device of claim 1, wherein the black data is image data having the 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 data analysis unit analyzes image data corresponding to each pixel, respectively.

5. The liquid crystal display device of claim 1, wherein if the variation of luminance analyzed in the data processing unit is greater than a preset variation of luminance, the black data processing unit inserts black data into the input image data stream.

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

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

8. The liquid crystal display device of claim 1, wherein the black data is inserted in a frame preceding the variation of luminance or in a frame following the variation of luminance.

9. 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 of the image data;inserting black data into the input image data stream based on the variation of luminance from the comparing step;outputting an output image data stream from the inserting step; anddisplaying images on the liquid crystal panel based on the output image data stream.

10. The method of claim 9, wherein the black data is image data having the lowest gray level.

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

12. The method of claim 9, wherein the image data is analyzed corresponding to each pixel, respectively.

13. The method of claim 9, wherein the black data is inserted into the image data if the variation of luminance is greater than a preset variation of luminance.

14. The method of claim 9, wherein the black data of at least one pixel is inserted for the entire frame.

15. The method of claim 9, wherein the black data is inserted for each pixel, respectively.

16. The method of claim 9, wherein the black data is inserted either in a frame preceding the variation of luminance or in a frame following the variation of luminance.

17. The method of claim 9, 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.