| 摘要 |
A backlight apparatus that can reduce transmission load and allows high quality local contrast control and an image display apparatus using this backlight apparatus are provided. An LED backlight (121) has a light emitting surface in which P light emitting areas that can each individually emit light are divided into Q groups, and radiates light from the P light emitting areas to a display panel (110). A feature amount detecting section (133) detects a feature amount of an image signal. A brightness calculating section (132) determines the light emission values of the P light emitting areas on a per light emitting area basis based on the feature amounts detected. A backlight driving section (122) detects the light emitting states in the P light emitting areas on a per group basis based on the light emitting brightness values determined. The backlight driving section (122) changes the group in which the light emitting state is renewed, among the Q groups at a frequency of M times per one frame period of the image signal.
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