Patent ID: 6091203
Filing Date: 2000-07-18
Classification: G09G

Abstract:
An element driving device for driving an active element with a variable drive current comprising:a power supply electrode applied with a predetermined drive voltage;a drive transistor for converting a drive voltage to be applied to said power supply electrode into a drive current corresponding to a control voltage to be applied to a gate electrode and supplying said active element with the drive current;a signal electrode supplied with a control current for driving said active element;a current conversion element for converting the control current to be supplied to said signal electrode into the control voltage;voltage holding means for holding the control voltage converted by said current conversion element and applying the control voltage to the gate electrode of said drive transistor;a control electrode applied with a control signal for controlling the operation of the voltage holding of said voltage holding means;first switching means for turning on and off a connection between said voltage holding means and said current conversion element in response to a control signal applied to said control electrode; andsecond switching means for turning on and off a connection between said signal electrode and said current conversion element in response to said control signal applied to said control electrode.