Backlight module having light guide plate with positioning member for positioning optical films

摘要

A backlight module (2) includes a light guide plate (24) having a light incident surface (241) and a light output surface (242) adjacent to the incident surface; a light source (25) disposed adjacent to the light incident surface; and plural optical films (22, 23). The light guide plate further includes plural positioning members (245) at a periphery of the light output surface, and the positioning members are configured for positioning the optical films on or above the light output surface. Therefore the backlight module having the optical films can be mechanically stable and operate properly.