The invention relates to back light module including a light board with a light input side; at least one light source near to the light input side; a reflector is near and around to the light source, a thermal conduction layer formed in the reflector is near to the inside of the light source and many heat pipes connected with the reflector. It also relates to another back light module including a diffusion board; many light sources set in the bottom of the diffusion board; a reflector is near and around to the light source; a thermal conduction layer formed in the reflector is near to the inside of the light source and many heat pipes connected with the reflector. The invention has the good radiating efficient. |