Patent ID: 7843151

Claim:
A backlight control circuit, comprising: at least one load circuit, each comprising a lamp and an output terminal, the output terminal outputting a high voltage when the lamp being in a normal working state, and outputting a low voltage when the lamp being in an open circuit state or a short circuit state; a pulse width modulation integrated circuit comprising a current sampling pin, the pulse width modulation integrated circuit configured to stop working if the current sampling pin having a low voltage; a micro controller comprising an output terminal and a plurality of analog to digital input terminals, the output terminal outputting a high level signal when the analog to digital input terminals all receiving high level signals, and the output terminal outputting a low level signal when any one of the analog to digital input terminals receiving a low level signal; wherein the output terminal of each load circuit is connected to a corresponding analog to digital input terminal of the micro controller, the output terminal of the micro controller is connected to the current sampling pin of the pulse width modulation integrated circuit.