Patent ID: 8500319

Claim:
A light source module, comprising: a light source; and a housing receiving the light source and comprising a transparent light emitting plate, wherein the transparent light emitting plate comprises an outer surface away from the light source and a micro structure positioned on the outer surface, the micro structure comprises a number of first light guide projectors and a number of second light guide projectors, the number of first light guide projectors are positioned at a middle part of the outer surface, the number of the second light guide projectors are positioned at two end parts of the outer surface beside the number of first light guide projectors, the number of the first light guide projectors and the number of the second light guide projectors extend along the outer surface and are substantially perpendicular to each other, a cross-sectional surface of each of the first light guide projectors substantially perpendicular to the extending direction of the number of first light guide projectors is semi-circular-shaped, and a cross-sectional surface of each of the second light guide projectors substantially perpendicular to the extending direction of the number of second light guide projectors is triangular-shaped.