Patent ID: 7466166
Filing Date: 2008-12-16
Classification: G09G,H03M

Abstract:
1. A current driver switchable between a calibration mode and an output mode generating an output current according to an input signal, the current driver comprising: R current copy circuits, where R is a natural number; a reference current source for supplying a reference current having a given current value; a control section; and an output current generator, wherein each of the current copy circuits stores the reference current from the reference current source in a storage state and outputs the stored reference current in an output state, wherein the control section sets, in the calibration mode, at least one of the R current copy circuits in a storage state so that the R current copy circuits are set in the storage state in sequence one by one, and sets in the output mode, all the R current copy circuits in an output state, and wherein the output current generator includes: R switches each connected between an output of each of the current copy circuits and an output node for supplying the output current; and a selector generating an output current having a current value corresponding to a value of the input signal by controlling the switches in accordance with the value of the input signal in the output mode so that the switches are turned ON/OFF.