Display device

1. A display device comprising:

a display panel including a plurality of pixels;

at least three of a first sub-pixel in a first color, a second sub-pixel in a second color, a third sub-pixel in a third color, and a fourth sub-pixel in a fourth color, the at least three sub-pixels being included in each of the pixels; and

a controller configured to input an input signal to the first sub-pixel to the fourth sub-pixel, wherein,

when display is performed in a plurality of display regions in respective single colors, each display region including a boundary section adjacent to another display region, the controller inputs a signal for lighting a sub-pixel that does not contribute to one of the single colors in a halftone manner, only in at least one pixel included in at least one of the boundary sections of the display regions.

2. The display device according to claim 1 , wherein

the controller inputs a signal for lighting a sub-pixel that contributes to one of the single colors in a halftone manner, in the pixel included in at least one of the boundary sections.

3. The display device according to claim 1 , wherein

the controller inputs a signal for fully lighting a sub-pixel that contributes to one of the single colors, and a signal for lighting a sub-pixel that does not contribute to one of the single colors and that displays white, in a halftone manner, in the pixel included in at least one of the boundary sections.

4. The display device according to claim 1 , wherein

the controller inputs a signal for lighting a sub-pixel in a halftone manner, in only the boundary section of one display region.

5. The display device according to claim 1 , wherein

the single colors displayed in the display regions are primary colors.

6. The display device according to claim 1 , wherein

the single colors displayed in the display regions are complementary colors of primary colors.

7. The display device according to claim 1 , wherein

the single colors displayed in the display regions are a primary color and a complementary color of the primary color.

8. The display device according to claim 1 , wherein the boundary section of a first one of the display regions is on a pixel row or a pixel column closest to a second one of the display regions adjacent and closest to the first one of the display regions.

9. The display device according to claim 1 , wherein

the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel have a same shape and a same area, and

the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel are arranged in one of the pixels such that the first sub-pixel and the second sub-pixel are adjacent to each other in a first direction, the third sub-pixel and the fourth sub-pixel are adjacent to each other in the first direction, the first sub-pixel and the third sub-pixel are adjacent to each other in a second direction perpendicular to the first direction, and the second sub-pixel and the fourth sub-pixel are adjacent to each other in the second direction.

10. The display device according to claim 1 , wherein

the pixels include a plurality of first pixels, and a plurality of second pixels, each of the first pixels including the first sub-pixel, the second sub-pixel, and the third sub-pixel, and each of the second pixels including the first sub-pixel, the second sub-pixel, and the fourth sub-pixel,

the first pixels and the second pixels are alternately arranged in a first direction, and the first pixels and the second pixels are alternately arranged in a second direction different from the first direction,

the first sub-pixel and the second sub-pixel have a same shape and a same area,

the third sub-pixel and the fourth sub-pixel have a larger area than the first sub-pixel,

in each of the first pixels, the first sub-pixel and the third sub-pixel are adjacent to each other in the first direction, the second sub-pixel and the third sub-pixel are adjacent to each other in the first direction, and the first sub-pixel and the second sub-pixel are adjacent to each other in the second direction, and

in each of the second pixels, the first sub-pixel and the fourth sub-pixel are adjacent to each other in the first direction, the second sub-pixel and the fourth sub-pixel are adjacent to each other in the first direction, and the first sub-pixel and the second sub-pixel are adjacent to each other in the second direction.

11. The display device according to claim 1 , wherein

the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel have a same shape and a same area, and

the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel are arranged in a first direction.

12. A method of driving a display device including

a display panel including a plurality of pixels, and

at least three of a first sub-pixel in a first color, a second sub-pixel in a second color, a third sub-pixel in a third color, and a fourth sub-pixel in a fourth color, the three sub-pixels being included in each of the pixels, the method comprising:

when display is performed in a plurality of display regions in respective single colors, each display region including a boundary section adjacent to another display region, inputting a signal for lighting a sub-pixel that does not contribute to one of the single colors in a halftone manner, only in at least one pixel included in at least one of the boundary sections of the display regions.