| 摘要 |
PROBLEM TO BE SOLVED: To improve a picture quality by reducing a false contour at the time of displaying a moving picture on a display device to display a multi-gradation picture by sub-field method. SOLUTION: One frame is divided into (k) pieces (for example k=2) of equal display periods and each divided display period is constituted of (n) pieces (for example sf1-sf3) of sub-fields sf1-sfn, and each the sub-fields sf1-sfn is weighted in luminance and a combination of k×n screens (for example 6 screens) permits to display a multi-gradation picture, therefore, it is possible to disperse non-display periods Tua, Tub and reduce each of them Tua, Tub to 1/k (for example 1/2) or less, compared with the case when one frame is constituted of (n) pieces of sub-fields SF1-SFn for displaying a multi-gradation picture by the combination of luminance of (n) pieces of screens. Thus, illumination of the sub-fields is averaged, and a picture is reduced in false contours and improved in quality at the time of displaying a moving picture. |
