Display device and method for driving display device

1. A display device comprising:

an image display unit that includes a plurality of main pixels in an image display region, the image display unit including sub--pixels that are a red pixel, a green pixel, a blue pixel, and a white pixel;

a light source that irradiates the image display region with illumination light;

a light source control unit that controls luminance of the light source; and

a color information correction processing unit that corrects first color information that is obtained based on the luminance of the light source and an input video signal second color information,

wherein, when color information of at least one of the red pixel, the green pixel, and the blue pixel included in the first color information exceeds a predetermined threshold, the second information is corrected by degenerating color information of the red pixel, the green pixel, and the blue pixel and by adding color information of the white pixel included in the first color information based on the degenerated color information of the red pixel, the green pixel, and the blue pixel.

2. The display device according to claim 1 , wherein the color information of the red pixel, the green pixel, and the blue pixel included in the first color information is degenerated after the color information of at least one of the red pixel, the green pixel, and the blue pixel is extended.

3. The display device according to claim 1 , wherein the color information correction processing unit corrects the first color information to the second color information while keeping a ratio of color information of the red pixel, the green pixel, and the blue pixel included in the first color information and degenerating the color information.

4. The display device according to claim 1 , wherein the color information correction processing unit corrects the first color information to the second color information by adding the sum total of degeneration amounts of the color information of the red pixel, the green pixel, and the blue pixel included in the first color information to the color information of the white pixel included in the first color information.

5. The display device according to claim 1 , wherein the color information correction processing unit corrects the first color information to the second color information by changing an addition amount of the color information of the white pixel included in the first color information corresponding to a value ratio among the red pixel, the green pixel, the blue pixel, and the white pixel.

6. The display device according to claim 1 , wherein the color information correction processing unit corrects the first color information to the second color information by changing an addition amount of the color information of the white pixel included in the first color information corresponding to an area of an image displayed in the image display region.

7. A method for driving a display device, the method comprising:

degenerating color information of a red pixel, a green pixel, and a blue pixel included in first color information to be displayed on a predetermined main pixel, the first color information being obtained based on luminance of light source and an input video signal, when the color information of at least one of the red pixel, the green pixel, and the blue pixel included in the first color information exceeds a predetermined threshold; and

correcting the first color information to second color information by adding color information of a white pixel included in the first color information based on the degenerated color information of the red pixel, the green pixel, and the blue pixel.

8. The method for driving a display device according to claim 7 , wherein at the degenerating, the color information of the red pixel, the green pixel, and the blue pixel included in the first color information is degenerated after the color information of at least one of the red pixel, the green pixel, and the blue pixel is extended.

9. The method for driving a display device according to claim 7 , wherein at the degenerating, the color information is degenerated while a ratio of color information of the red pixel, the green pixel, and the blue pixel included in the first color information is kept.

10. The method for driving a display device according to claim 7 , wherein at the correcting, the color information correction processing unit adds the sum total of degeneration amounts of the color information of the red pixel, the green pixel, and the blue pixel included in the first color information to the color information of the white pixel included in the first color information.

11. The method for driving a display device according to claim 7 , wherein at the correcting, an addition amount of the color information of the white pixel included in the first color information is changed corresponding to a value ratio among the red pixel, the green pixel, the blue pixel, and the white pixel.

12. The method for driving a display device according to claim 7 , wherein at the correcting, an addition amount of the color information of the white pixel included in the first color information is changed corresponding to an area of an image displayed in the image display region.