Backlight module

A backlight module, comprising:

• a backboard, a reflection plate mounted inside the backboard, a light guide board arranged on the reflection plate, and an optic film arranged on the light guide board, the light guide board comprising a main body and a plurality of upper positioning pegs and lower positioning pegs respectively projecting from upper and lower surfaces of the main body, the optic film forming first positioning holes corresponding to the upper positioning pegs, the reflection plate forming second positioning holes corresponding to the lower positioning pegs, the backboard forming positioning channels corresponding to the lower positioning pegs, the first positioning holes of the optic films being fit over the upper positioning pegs of the light guide board, the lower positioning pegs of the light guide board being respectively set through the second positioning holes of the reflection plate to be received in the positioning channels of the backboard.