Patent ID: 7667787
Filing Date: 2010-02-23
Classification: G02B,G02F

Abstract:
1. A backlight device comprising: a light diffusion plate disposed between a transmission type display panel and a light source unit in which plural light source blocks, where a large number of light emitting diodes are mounted, are arranged with a predetermined spacing therebetween, and adapted to allow a portion of rays of display light which have been emitted from respective light emitting diodes to be transmitted therethrough, and to allow the other portion thereof to be reflected thereon to deliver the rays of display light thus obtained to the transmission type display panel in a uniform state from an entire surface thereof, wherein the light diffusion plate is formed by resin material having light transmission characteristics, and is adapted so that light adjustment patterns are formed within respective regions facing respective light emitting diodes of plane surfaces opposite to the light source blocks to reflect the rays of display light, the light adjustment patterns being formed by attaching light reflection ink, wherein the light reflection ink comprises a light reflection ink material comprising a light shielding agent and a diffusion agent, and wherein respective light adjustment patterns are formed to correspond to the respective light emitting diodes, each of the respective light emitting diodes having a diameter D, and wherein a first length W