Patent ID: 7428027
Filing Date: 2008-09-23
Classification: G02B,G02F

Abstract:
1. An optical sheet arranged in a back side of a display panel, said display panel displaying a screen display by controlling a light transmission or a light shading for a pixel unit, and a display light enters said display panel from said optical sheet, comprising: a lens sheet having a plurality of microlenses arranged on a front surface thereof and a plurality of projections located at a back side thereof, said projection being located between light transmission parts, and a part corresponding to said microlens being said light transmission part; and a plurality of light reflection layers provided on top of said plurality of projections, wherein said light transmission part is comprised of a material of which a refractive index is lower than a refractive index of said lens sheet, wherein a straight line connecting an inside corner of one of said light reflection layers and an outside corner of another said light reflection layer is located inside of a limit normal line, wherein a light source side of a center of said lens sheet is defined as inside and the opposite side is defined as outside, and wherein a normal line of a side surface of the projection, starting from said inside corner of said light reflection layer among a pair of said light reflection layers sandwiching said light transmission part is defined as a limit normal line, and wherein part of a light from a light source, said light exiting from said back side, is reflected by said light reflection layer while a light exiting from said light transmission part is refracted by said microlens so as to exit towards said display panel.