Patent ID: 8350840

Claim:
A switching circuit for supplying a voltage to a display driver, comprising: an output terminal for connection to the display driver; a first switch connected between the output terminal and a first node to operate in response to a first switching control signal; a second switch connected between the first node and a second node to operate in response to a second switching control signal; and a third switch connected between the first node and a third node to operate in response to a third switching control signal, wherein the first switch is implemented using a high-voltage transistor, the voltage difference between the first and second nodes and the voltage difference between the first and third nodes are limited by control signals to a value sustainable by a low-voltage transistor, each of the second and third switches is implemented using a low-voltage transistor, and a gate of the high-voltage transistor is at least two times longer than a gate of the low-voltage transistor.