Patent ID: 7262652
Filing Date: 2007-08-28
Classification: G09G,H03F

Abstract:
1. A current driver, comprising: a first input/output section through which a first current is input or output; a first bias voltage generating transistor connected between the first input/output section and a first reference node; a second input/output section through which a second current is input or output; a second bias voltage generating transistor connected between the second input/output section and the first reference node; K driving transistors connected between an output node through which an output current is input or output and the first reference node, where K is a natural number; a first gate line to which a gate of the first bias voltage generating transistor, gates of the K driving transistors, and a gate of the second bias voltage generating transistor are connected in this order; a first voltage supply node which receives a first voltage; a first differential amplifier circuit which outputs a third voltage having a voltage value determined according to a difference between a voltage value of a second voltage at a first interconnection node of the first input/output section and the first bias voltage generating transistor and the first voltage value of the first voltage received by the first voltage supply node; a second voltage supply node which receives a fourth voltage; and a second differential amplifier circuit which outputs a sixth voltage having a voltage value determined according to a difference between a voltage value of a fifth voltage at a second interconnection node of the second input/output section and the second bias voltage generating transistor and the fourth voltage value of the fourth voltage received by the second voltage supply node, wherein the first bias voltage generating transistor receives at its gate the third voltage output by the first differential amplifier circuit, and the second bias voltage generating transistor receives at its gate the sixth voltage output by the second differential amplifier circuit.