Backlight device and video display apparatus using the same

摘要

In a backlight device (3) manufactured by simultaneously arranging a plurality of backlight blocks (4) in a combination manner, while each of the backlight blocks (4) is comprised of: a light emitting source containing an LED (7), or a fluorescent lamp; a light conducting plate (5) for conducting light emitted from the light emitting source to the side of a liquid crystal panel (1); and a reflection seat (8) arranged on a rear plane of the light conducting plate (5); a dark luminance portion (12) and a middle dark/bright luminance portion (13) corresponding to dark/bright difference patterns for producing a dark/bright difference in luminance emitted from the backlight blocks (4) are formed; and luminance of a bright luminance portion (11) corresponding to a bright pattern of luminance emitted from a boundary between the backlight blocks (4) is caused not to become visually conspicuous by a luminance fluctuation of the dark/bright difference pattern emitted from the backlight blocks (4).