| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of an image displayed on a liquid crystal panel by dividing a backlight device into multiple regions, and controlling the emission luminance of a backlight region by region according to the brightness of an image signal. SOLUTION: The backlight device 35 is divided into multiple regions, and has a structure in which light emitted from a light source of each of the regions is allowed to leak to other regions than an own region. A maximum gradation detector 11 detects a maximum gradation of a regional image signal displayed on each of the regions of a liquid crystal panel 34. An image gain calculator 12 obtains a gain to be multiplied to each regional image signal. An emission luminance calculator 22 obtains an emission luminance of light to be emitted by each light source by using an operational expression according to the emission luminance of light to be emitted by the backlight device 35. At this time, if the emission luminance takes a negative value as a result calculation, the emission luminance calculator 22 makes a correction so that the emission luminance can take a value equal to or greater than 0. COPYRIGHT: (C)2009,JPO&INPIT
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