Patent ID: 8730150

Claim:
A backlight module comprising a light guide plate for guiding light, a first light source unit, and a second light source unit; the first light source unit and the second light source unit being respectively disposed at the opposite sides of the light guide plate; both of the first light source unit and the second light source unit comprising one or more light sources; each of the light sources of the first light source unit being symmetrically arranged with each of the light sources of the second light source unit on a one-on-one basis, characterized in that: a ridge-shaped groove is disposed on the middle of a bottom surface of the light guide plate; the backlight module further comprises a driving circuit electrically connected to the first light source unit and the second light source unit for controlling the luminance of each of the light sources; wherein an actual luminance value generated by each of the light sources depends on a predetermined luminance value of the each light source minus a first reference value, and the first reference value is calculated by a first function value relating to the predetermined luminance values of light sources at both sides of the each light source.