Patent ID: 7641378

Claim:
A backlight module, comprising: a first frame, comprising at least a first reflection area on an inner surface thereof; a light guide plate, disposed in the first frame and located beside to the first reflection area, wherein the light guide plate has a light incident surface; a light source, disposed in the first frame and between the first reflection area and the light incident surface; a positioning metal piece, disposed on the first reflection area of the first frame, wherein the positioning metal piece is adopted for reflecting the light emitted from the light source to the light incident surface; and a second frame, disposed on the first frame, wherein the second frame comprises: an opening to expose the light guide plate, wherein an inner surface of the second frame comprises at least a second reflection area, and the second reflection area is adopted for reflecting the light emitted from the light source to the light incident surface; and a retaining recess, wherein the positioning metal piece extends into the retaining recess, so as to position the first frame and the second frame.