Display device and a driving method thereof

1. A display device comprising:

a processor outputting an input frame;

a stereo frame generator generating a first frame and a second frame based on the input frame;

a first sub-display device displaying a first image based on the first frame; and

a second sub-display device displaying a second image based on the second frame,

wherein a first color gamut of the first frame is different from a second color gamut of the second frame, and

wherein the stereo frame generator includes:

an image separation unit generating a first separation frame that includes first grayscales for a first color of the input frame and generating a second separation frame that includes second grayscales for a second color of the input frame and third grayscales for a third color of the input frame, and

wherein the image separation unit assign arbitrary values to the second grayscales for the second color and the third grayscales for the third color of the first separation frame, and

wherein the image separation unit assign arbitrary values to the first grayscales for the first color of the second separation frame.

2. The display device of claim 1 , wherein the number of grayscales included in the input frame is the same as the number of grayscales included in each of the first frame and the second frame.

3. The display device of claim 1 , wherein the stereo frame generator further includes:

a gamma application unit generating a first gamma frame by applying a gamma curve to grayscales included in the first separation frame and generating a second gamma frame by applying the gamma curve to grayscales included in the second separation frame;

a color gamut correction unit generating a first correction frame by applying the first color gamut to the first gamma frame and generating a second correction frame by applying the second color gamut to the second gamma frame; and

an inverse gamma application unit generating the first frame by applying an inverse gamma curve to the first correction frame and generating the second frame by applying the inverse gamma curve to the second correction frame.

4. The display device of claim 3 , wherein the color gamut correction unit includes:

a plurality of first lookup tables that include a plurality of first offset information;

a first offset information generator receiving a first shift level and generating first final offset information corresponding to the first shift level based on the plurality of first offset information;

a plurality of second lookup tables that include a plurality of second offset information; and

a second offset information generator receiving a second shift level and generating second final offset information corresponding to the second shift level based on the plurality of second offset information.

5. The display device of claim 4 , wherein the plurality of second offset information is inverted values of the plurality of first offset information.

6. The display device of claim 4 , wherein the first offset information generator generates the first final offset information by summing or interpolating the plurality of first offset information, and

wherein the second offset information generator generates the second final offset information by summing or interpolating the plurality of second offset information.

7. The display device of claim 4 , wherein the color gamut correction unit further includes:

a plurality of reference lookup tables that include a plurality of reference color gamut information; and

a multiplexer outputting selected reference color gamut information among the plurality of reference color gamut information based on color mode information.

8. The display device of claim 7 , wherein the color gamut correction unit further includes:

a first color gamut application unit determining the first color gamut based on the selected reference color gamut information and the first final offset information, and generating the first correction frame by applying the first color gamut to the first gamma frame; and

a second color gamut application unit determining the second color gamut based on the selected reference color gamut information and the second final offset information, and generating the second correction frame by applying the second color gamut to the second gamma frame.

9. The display device of claim 8 , wherein the first color gamut application unit determines the first color gamut by adding the selected reference color gamut information and the first final offset information, and

wherein the second color gamut application unit determines the second color gamut by adding the selected reference color gamut information and the second final offset information.

10. The display device of claim 9 , wherein the first color gamut application unit generates the first correction frame by mapping grayscales included in the first gamma frame into a range of the first color gamut, and

wherein the second color gamut application unit generates the second correction frame by mapping grayscales included in the second gamma frame into a range of the second color gamut.

11. A driving method of a display device comprising:

generating a first frame and a second frame based on an input frame;

displaying a first image through a first sub-display device based on the first frame; and

displaying a second image through a second sub-display device based on the second frame,

wherein a first color gamut of the first frame is different from a second color gamut of the second frame,

wherein the generating the first frame and the second frame includes:

generating a first separation frame that includes first grayscales for a first color of the input frame and generating a second separation frame that includes second grayscales for a second color of the input frame and third grayscales for a third color of the input frame;

assigning arbitrary values to the second grayscales for the second color and the third grayscales for the third color of the first separation frame; and

assigning arbitrary values to the first grayscales for the first color of the second separation frame.

12. The driving method of claim 11 , wherein the number of grayscales included in the input frame is the same as the number of grayscales included in each of the first frame and the second frame.

13. The driving method of claim 11 , wherein the generating the first frame and the second frame further includes:

generating a first gamma frame by applying a gamma curve to grayscales included in the first separation frame and generating a second gamma frame by applying the gamma curve to grayscales included in the second separation frame;

generating a first correction frame by applying the first color gamut to the first gamma frame and generating a second correction frame by applying the second color gamut to the second gamma frame; and

generating the first frame by applying an inverse gamma curve to the first correction frame and generating the second frame by applying the inverse gamma curve to the second correction frame.

14. The driving method of claim 13 , further comprising:

generating first final offset information corresponding to a first shift level based on the first shift level and a plurality of first offset information; and

generating second final offset information corresponding to a second shift level based on the second shift level and a plurality of second offset information.

15. The driving method of claim 14 , wherein the plurality of second offset information is inverted values of the plurality of first offset information.

16. The driving method of claim 14 , wherein the first final offset information is generated by summing or interpolating the plurality of first offset information, and

wherein the second final offset information is generated by summing or interpolating the plurality of second offset information.

17. The driving method of claim 14 , further comprising:

selecting one of a plurality of reference color gamut information based on color mode information.

18. The driving method of claim 17 , wherein the first color gamut is determined based on the selected reference color gamut information and the first final offset information, and the first correction frame is generated by applying the first color gamut to the first gamma frame, and

wherein the second color gamut is determined based on the selected reference color gamut information and the second final offset information, and the second correction frame is generated by applying the second color gamut to the second gamma frame.

19. The driving method of claim 18 , wherein the first color gamut is determined by adding the selected reference color gamut information and the first final offset information, and

wherein the second color gamut is determined by adding the selected reference color gamut information and the second final offset information.

20. The driving method of claim 19 , wherein the first correction frame is generated by mapping grayscales included in the first gamma frame into a range of the first color gamut, and

wherein the second correction frame is generated by mapping grayscales included in the second gamma frame into a range of the second color gamut.