| 摘要 |
PROBLEM TO BE SOLVED: To provide technology that can compensate poor visibility of a display screen due to irregularity of luminance characteristics of individual LEDs without halting operations of devices.SOLUTION: An LED display device 100 comprises: an LED aging display unit 21 that is provided separately from an LED display unit 10, including an LED 22; an LED aging unit 20 that includes a luminance measurement unit 9 measuring a luminance reduction rate of the LED 22 for each color in correspondence to a light-up time of an LED 1, and a luminance reduction rate storage unit 11 storing the luminance reduction rate measured by the luminance measurement unit 9 for each color; a correction coefficient computation unit 12 that computes a correction coefficient for correcting luminance of the LED 1 for each color on the basis of cumulative light-up time of the LED 1 for each color stored in a light-up time storage unit 6 and the luminance reduction rate for each color stored in the luminance reduction rate storage unit 11; and a luminance correction circuit 4 that corrects the luminance of the LED 1 on the basis of the correction coefficient computed by the correction coefficient unit 12.SELECTED DRAWING: Figure 1 |
