Patent ID: 7330003
Filing Date: 2008-02-12
Classification: H05B,Y02B

Abstract:
1. A backlight control circuit comprising: a first load circuit comprising a first backlight and a first backlight inspecting circuit connected in series, the first backlight inspecting circuit comprising a first output end; a second load circuit comprising a second backlight and a second backlight inspecting circuit connected in series, the second backlight inspecting circuit comprising a second output end; a pulse width modulation integrated circuit (PWM IC) comprising a current sampling pin; a switching circuit comprising a first transistor, a second transistor, a current limiting resistor, and a bias resistor, the first transistor comprising an emitter electrode connected to ground, a collector electrode connected to the sampling pin of the PWM IC, and a base electrode, the second transistor comprising an emitter electrode connected to ground, a collector electrode connected to the base electrode of the first transistor, and a base electrode connected to the ground via the bias resistor; a first input circuit comprising: