Backlight Device and Transmission Type Liquid Crystal Display Apparatus

摘要

A transmission liquid crystal display device using a backlight device for supplying display light emitted from a large number of light emission diodes to a transmission display panel. The transmission liquid crystal display device has an optical sheet block ( 10 ) between a liquid crystal panel ( 5 ) and a light source unit ( 7 ) having a large number of LEDs ( 12 ) and has a light diffusion plate ( 15 ), which has light transmission properties and is made of resin, for controlling the incidence of display light emitted from each of the LEDs ( 12 ). On the light diffusion plate ( 15 ) are formed vertically long light modulation patterns ( 18 ) by using light reflective ink. Each pattern ( 18 ) faces each LED ( 12 ) and has a size equal to the size of each LED ( 12 ) including its external shape. The light modulation patterns ( 18 ) uniformize the light emitted from the LEDs ( 12 ) and realize an image display of high brightness where color irregularity and horizontal stripes are suppressed.