Patent ID: 6992335

Claim:
A light guide plate comprising: two major faces to provide an emission face and a back face; and an incidence end face for introducing light, wherein said back face is provided with a great number of projection-like micro-reflectors for direction-conversion of light, each of which has a guiding portion and a conversion output portion that includes a ridge portion and a pair of first and second reflection surfaces formed on both sides of the ridge portion respectively as to be inclined with respect to a general plane representative of said back face, said ridge portion and said first and second reflection surfaces forming a valley in each of said micro-reflectors, said valley getting narrower and shallower as being distant from the guiding portion so that an inner input light reaching the valley via the guiding portion is reflected by one of the first and second reflection surfaces and is further reflected by the other of the first and second reflection surfaces as to produce an inner output light having a main propagation direction that is inclined with respect to a frontal direction in a plane perpendicular to said incidence end face so as to get remote from said incidence end face.