Patent ID: 7682047

Claim:
A backlight module, comprising: a light box, having a bottom and a light-emitting section opposite to the bottom, wherein the bottom has a first surface and a second surface opposite to the first surface, and the first surface is closer to the light-emitting section; a plurality of light source sets, disposed on the bottom, wherein each of the light source sets comprises a substrate disposed on the bottom and a plurality of point light sources disposed on the substrate; a heat dissipation device, comprising: a thermal assembly including a plurality of first covers and a second cover, wherein each of the first covers is disposed on the second surface at a position below one of the light source sets, an air flow channel is formed between each of the first covers and the bottom, an end of each of the first covers has a first opening, the other end of each of the first covers has a second opening, the second cover has a hole, the first covers are connected to and communicate with the second cover, and the second openings communicate with each other through the second cover; and at least one fan, disposed at the thermal assembly and at the hole of the second cover, wherein the fan makes air in the air flow channels to flow out from the second openings, or the fan makes the air to flow into the air flow channels from the second openings.