Backlight device and transmission type liquid crystal display apparatus

The present invention is directed to a transmission type liquid crystal display apparatus using a backlight device for delivering rays of display light which have been emitted from a large number of light emitting diodes to a transmission type display panel, wherein an optical sheet block is provided between a liquid crystal panel and a light source unit including a large number of LEDs, the transmission type liquid crystal display apparatus comprising a light diffusion plate, consisting of resin, having light transmitting characteristic, which is adapted control incidence of rays of display light which have been emitted from the respective LEDs. At the light diffusion plate, light adjustment patterns facing the respective LEDs and adapted to take a shape which has dimensions including outer shape thereof and is longitudinally elongated are formed by light reflection ink. Thus, realization of uniformity of rays of light which have been emitted from LEDs is preformed to realize image display of high luminance in which color unevenness and/or lateral stripe have been suppressed.