A backlight device includes a light source module having a plurality of light sources, a detecting circuit, a control unit, and a pulse width modulation (PWM) driving circuit. The detecting circuit is used for detecting the brightness of the light source module and generating a detecting signal to the...http://www.google.de/patents/US7348960?utm_source=gb-gplus-sharePatent US7348960 - Backlight device and method for controlling light source brightness thereof
