Liquid crystal display device and method for improving color reproducibility thereof

1. A liquid crystal display device, comprising:

a liquid crystal panel having a plurality of gate lines and data lines crossing each other, and having red (R), green (G) and blue (B) pixels arranged in a matrix pattern;

a light source transmitting light through the R, G, and B pixels creating red, green, and blue colors respectively;

a gate driving unit for applying scan signals to the gate lines;

a lookup table for storing gray scale values of image information including R, G and B data, where a gray scale value of a gray level of the B data that is lower than a gray level at which a color saturation is reduced, is stored as a gray scale value of gray levels that are higher than the gray level at which the color saturation is reduced,

wherein the lookup table includes a same initial gray scale value of at least one of the R and G data for all gray levels prior to a gray level at which the color saturation is reduced and the lookup table includes different gray scale values of the R and G data to mix with the B gray scale values from a gray level at which the color saturation is reduced to an uppermost gray level;

a data processing unit for compensating image information according to the gray scale values in the lookup table; and

a data driving unit for receiving the compensated image information and applying the compensated image information to the data lines.

2. The LCD device of claim 1 , wherein the gray scale value of the gray levels of the B data prior to a gray level at which a color saturation is reduced is the same as the gray scale value of the gray levels from the gray level at which a color reproducibility is reduced to the uppermost gray level.

3. The LCD device of claim 1 , wherein the B data has 64 gray levels.

4. The LCD device of claim 1 , wherein the gray level at which a color saturation is reduced among the B data is a 52 nd gray level.

5. The LCD device of claim 1 , wherein the gray level prior to a gray level where a color saturation is reduced among the B data is a 51 st gray level.

6. A method for improving a color reproducibility of a liquid crystal display (LCD) device, the method comprising:

detecting a gray scale value of a gray level at which a color saturation is reduced, and a gray scale value of a gray level that is lower than the gray level at which a color saturation is reduced, by measuring a color displayed on a liquid crystal panel with increasing gray scale values of B data among image information including R, G and B data;

storing the gray scale value of the gray level of the B data that is lower than the gray level at which a color saturation is reduced, as a gray scale value of gray level that are higher than the gray level at which a color saturation is reduced;

storing a same initial gray scale value of at least one of the R and G data for all gray levels prior to a gray level at which a color saturation is reduced and including different gray scale values of the R and G data to mix with the B gray scale values from a gray level at which the color saturation is reduced to an uppermost gray level;

compensating the image information according to the gray level and mixing the gray scale values of at least two of R, G, and B data; and

applying the compensated image information to data lines of the liquid crystal panel.

7. The method of claim 6 , wherein the gray scale value of the gray level prior to the gray level at which a color saturation is reduced is same as the gray scale value of gray levels from the gray level at which a color saturation is reduced to the uppermost bit.

8. The method of claim 6 , wherein the B data has 64 gray levels.

9. The method of claim 6 , wherein the gray level at which a color saturation is reduced among the B data is a 52 nd gray level.

10. The method of claim 6 , wherein the gray level prior to a gray level where a color saturation is reduced among the B data is a 51 st gray level.

11. The liquid crystal display device of claim 1 , wherein the lookup table includes the same initial gray scale value for both R and G data.

12. The method of claim 6 , wherein the same initial gray scale value is the same for both the R and G data.