Patent ID: 6310588
Filing Date: 2001-10-30
Classification: G09G,H04N

Abstract:
An image display apparatus which displays a multi-gray-scale image, where the multi-gray-scale image is displayed in a time unit called TV field which is divided into N subfields which are respectively assigned luminance weights, and the multi-gray-scale image is expressed by illuminating desired subfields, the image display apparatus comprising:a first selecting unit for selecting a group of gray scale levels which cause the number of selectable gray scale levels to increase as a motion amount of an input image signal decreases, among the plurality of gray scale levels, wherein the luminance weights are represented as W1, W2, . . . and WN, each of the plurality of gray scale levels is expressed by an arbitrary combination of 0, W1, W2, . . . and WN, and the motion amount is a change of the input image signal over time, the first selecting unit including a table showing correspondence between motion amounts and combinations of gray scale levels in order between which a predetermined number of gray scale levels are skipped, wherein the table, as the motion amount increases, the predetermined number of skipped gray scale levels increases;a second selecting unit for selecting a gray scale level in accordance with a gray scale level of the input image signal, among the group of gray scale levels selected by the first selecting unit including a detecting unit for detecting a combination of gray scale levels from the table in accordance with the motion amount of the input image signals, anda subfield illuminating unit for illuminating subfields corresponding to the gray scale level selected by the second selecting unit, the subfield illuminating unit illuminates subfields corresponding to a gray scale level which corresponds to the input image signal, among the combination of gray scale levels detected by the detecting unit.