Patent ID: 7452093
Filing Date: 2008-11-18
Classification: G02B,G02F

Abstract:
1. A display device comprising: a light source; a prism sheet for deflecting and emitting light introduced into a transparent substrate, comprising: an array of transmission type optical modulation elements arranged on a light emission side of the prism sheet for modulating light emitted from the prism sheet; and a reflecting member including a plurality of circular reflecting faces arrayed concentrically from a center line for reflecting light from the light source arranged on the center axis, on the circular reflecting faces thereby to introduce the reflected lights into the prism sheet; wherein the reflecting member is arranged on an opposite side of the prism sheet with respect to the light source; wherein the reflecting member includes inner annular slopes and outer annular slopes for forming a plurality of annular ridgelines concentrically from a center of a curvilinearly recessed substrate, wherein the inner annular slopes are formed to reflect the light emitted from the light source into substantially collimated lights, and wherein the outer annular slopes are formed substantially in parallel with an emission optical path from the light source.