Patent ID: 7642805

Claim:
A short detection circuit to detect a short condition in a backlight module, wherein the backlight module comprises a WLED circuit having a first terminal connected to an output voltage and second terminal connected to a driver IC, the short detection circuit comprises: a PMOS comprising a gate, a drain and a source, wherein the gate of the PMOS receives a first voltage, the source of the PMOS connects to the second terminal; a NMOS comprising a gate, a drain and a source, wherein the gate of the NMOS receives a reference voltage, the drain of the NMOS connects to the drain of the PMOS and the source of the NMOS connects to a detection terminal such that when the plurality of WLED has a short condition to make a short voltage level at the second terminal passing through the PMOS and the reference voltage becomes a high state, the voltage of the detection terminal becomes a high state; a load connected between the source of the NMOS and a ground potential; and a detection module connected to the detection terminal, when the voltage of the detection terminal becomes a high state, the detection module detects a short condition.