Patent ID: 6839057
Filing Date: 2005-01-04
Classification: G09G

Abstract:
1. A drive circuit for driving a current-driven device, comprising: a signal line for passing therethrough a signal current corresponding to a drive current of the current-driven device; a drive transistor having a gate, a drain, and a source connected to a power supply line; a holding capacitor connected between said power supply line and the gate of said drive transistor; a first switch element for connecting said signal line and the drain of said drive transistor to each other; a second switch element for connecting the gate and drain of said drive transistor to each other; a third switch element for connecting the drain of said drive transistor and an end of said current-driven device to each other; an auxiliary transistor having a gate connected to the gate of said drive transistor, a source connected to the source of said drive transistor, and a drain connected to the drain of said drive transistor; and a fourth switch element for turning on and off a source-to-drain current of said auxiliary transistor.