Patent ID: 8477254
Filing Date: 2013-07-02
Classification: G02B,G02F

Abstract:
1. A backlight module, comprising: a light guide plate housed in a module case, said light guide plate comprising an elongated edge portion for a light incident surface between a pair of principal surfaces thereof; a light source unit incorporated in said module case interchangeably so as to slide along a lengthwise direction of said edge portion of said light guide plate, said light source unit comprising a cover member provided with a first protruded portion, said cover member being for holding a plurality of point light sources along said lengthwise direction, a side member of said module case comprising a front side member and a rear side member provided with a second protruded portion and arranged in parallel to said principal surfaces of said light guide plate, and being united together with a side wall member; and a coupling member enabling to change a positional relationship between said light guide plate and said light source unit, said coupling member having such a structure that a first distance between a light emitting surface of said point light source and said optical incident plane at a time of interchanging said light source unit is larger than a second distance between said light emitting surface of said point light source and said optical incident plane at a time of settled in a home position of said light source unit within said module case.