A backlight module comprises a back plate; a side-type light source; a light guide plate disposed on the back plate; and a quantum bar assembled between the light guide and the light source via a fixing bracket. The fixing bracket is a hollow cylinder, and comprises an accommodating space defined in the fixing bracket for installing the quantum bar and the first window faced toward the light guide plate and the second window faced toward the side-type light source and the length of the second window is equal to one of the light strip. A support beam is disposed on the light strip and between the two light sources, and the length of the support beam is less than or same as a width of the second window, and a height of the support beam is not less than a height of the light source, and the light strip is assembled in the second window.