Patent ID: 7683879

Claim:
A liquid crystal display drive circuit comprising: four output transistors receiving four drive voltages collectively, each of the four output transistors comprising a source receiving a corresponding one of the four drive voltages; an output terminal connected to drains of the four output transistors; and an output control circuit comprising a plurality of control transistors, the output control circuit being configured to select two output transistors out of the four output transistors according to a dot signal and a reverse dot signal that is a reverse of the dot signal and to select one output transistor out of the two selected output transistors according to a field signal and a reverse field signal that is a reverse of the field signal so that one of the four drive voltages is outputted to the output terminal, wherein the output control circuit comprises a pair of control transistors that complementarily turn on according to the dot signal and the reverse dot signal, the pair of control transistors is connected with a gate of one of the four output transistors, the one of the four output transistors is configured to turn off when one of the pair of control transistors is turned on and is further configured to receive the field signal or the reverse field signal at the gate thereof when another of the pair of control transistors is turned on.