A back light module includes a frame body, a back board, a reflecting
sheet, a light-guiding plate, a lighting member, an optical film and an
upper cover. The frame body and the back board are formed integral. The
frame body has its outer peripheral edge formed with lots of radiating
fins, and the back board and the radiating fins are respectively disposed
with numerous radiating grains for increasing the heat dissipation area
and elevating heat dissipation effect of the back light module, able to
effectively lower the working temperature and prolong the service life of
the lighting member, and elevate the working efficacy of the lighting
member and economize cost.