| 摘要 |
PROBLEM TO BE SOLVED: To prevent the life deterioration and thermal destruction of an LED and a peripheral circuit by a simple configuration.SOLUTION: A liquid crystal display device includes a back light drive unit 8. If an average luminance of video for one frame is equal to or less than a preset threshold, and it is determined from a luminance distribution that a high gradation signal of a fixed value or more is included in a video signal, and when a detected LED duty ratio exceeds a preset threshold for a fixed period of time, the back light drive unit 8 decreases the power supplied to a back light 9. |
