| 摘要 |
PROBLEM TO BE SOLVED: To control light emission, by quickly specifying a portion where turning on a backlight light source is unnecessary, regardless of the shape of a non-picture portion displayed on a display screen. SOLUTION: The video display device acquires (S1) image data of video signals to be displayed and computes (S2) with a stored n-th mask pattern. After computation, the device discriminates (S3) whether the mask portion of the n-th mask pattern coincides with the non-picture portion on the display screen; and if they coincide, the device controls (S4) so as to turn on the backlight light source according to the mask pattern. The light source corresponding to the mask portion will not turned be on, while the light source corresponding to the non-mask portion is turned on. If the mask portion of the mask pattern does not coincide with the non-picture portion of the display screen in the step S3, the device discriminates (S5) whether another mask pattern is present. If another mask pattern is not present, the device turns on (S6) the whole backlight light source; but if another mask pattern is present, the device updates (S7), by replacing n by n+1 and returns to the step S2. COPYRIGHT: (C)2008,JPO&INPIT
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