Patent ID: 8076863

Claim:
A backlight module, comprising: a plurality of light source matrixes, wherein each of the light source matrixes is electrically connected to N level switch lines and comprises: N light emitting units, wherein first ends of the light emitting units are electrically connected to each other and a second end of the i th light emitting unit is electrically connected an i th level switch line, N being an integer greater than 1, i being an integer and 1≦i≦N; and a current adjusting circuit, electrically connected to the level switch lines to provide and control the current that flows through the light source matrixes; and a light source driving circuit, electrically connected to the first ends of the light emitting units of each of the light source matrixes to sequentially drive the light source matrixes, wherein the light source driving circuit comprises: a plurality of second switches, respectively corresponding to the light source matrixes, wherein first ends of the second switches receive a predetermined voltage, second ends of the second switches are electrically connected to the first ends of the light emitting units in the corresponding light source matrixes, and the light source driving circuit sequentially turns on the second switches in a frame period; and a level control circuit, for generating the predetermined voltage and adjusting a level of the predetermined voltage once in every dimming time so as to switch the level of the predetermined voltage to one of a plurality of specified levels.