Patent ID: 6609809
Filing Date: 2003-08-26
Classification: G02B

Abstract:
A light guide plate, which is supplied with light from a primary light source, comprising an emission face for light-outputting, a back face opposite with said emission face and an incidence face for light-inputting,wherein said back face is provided with a great number of micro-reflectors for light-proceeding-direction-conversion, said great number of micro-reflectors are arranged with sidewise intervals on many imaginary lines K1, K2, K3 . . . which are separated with longitudinal intervals to each other and extend in directions generally perpendicular with respect to an imaginary reference line S that extends as to leave said incidence face, and, when many micro-reflector trios are imaginatively composed of micro-reflectors arranged on successive three imaginary lines Ki, Ki+1, Ki+2 (i=1, 2, 3, 4 . . . ) so that each micro-reflector trio consists of three micro-reflectors which are located adjacent to each other and picked up one by one from every imaginary line Ki, Ki+1, Ki+2 and further so that each of approximately all of said micro-reflectors belongs to only three trios of said many trios, said three micro-reflectors belonging to each of said many micro-reflector trios are located approximately on a straight line, and, covering rate of said micro-reflectors on said back face per unit area tends to increase according to an increasing distance from said incidence face and to increase according to an increasing distance from said imaginary reference line S.