| 摘要 |
PROBLEM TO BE SOLVED: To restrict luminance variation among monitors while achieving the high contrast in an image display apparatus that forms a single screen from a plurality of monitors.SOLUTION: The monitors 1 to 4 comprises: an image analysis part that obtains a first amount of characteristic of an image in a display area corresponding to each of the separate areas of an LED back light; and a gradation control part that determines a first luminance for an LED for each separate area according to the first amount of characteristic, and calculates an amount of luminance stretch for stretching first luminance uniformly within a range in which the total value of the drive current of the LED becomes equal to or below a predetermined permissible current value. The image display apparatus includes a microcomputer 19 which selects a smallest amount of luminance stretch from the amounts of luminance stretch obtained from the monitors 1 to 4 and outputs the selected smallest amount of luminance stretch to the monitors 1 to 4. Based on the smallest amount of luminance stretch obtained from the microcomputer 19, their respective gradation control parts of the monitors 1 to 4 stretch the first luminance uniformly, thereby determining second luminance. |
