Patent ID: 6617801
Filing Date: 2003-09-09
Classification: G09G

Abstract:
A drive device for a light-emitting panel, the light-emitting panel including a plurality of mutually intersecting anode leads and cathode leads and a plurality of light-emitting elements connected between said anode leads and said cathode leads at the intersections of said anode leads and said cathode leads, in which said respective light-emitting elements in the light-emitting panel are made to selectively emit light in response to information data, the drive device comprising:an anode power source circuit for generating anode power source voltage; a current source for generating drive current to cause said light-emitting elements to emit light based on said anode power source voltage; an anode drive switch for supplying said drive current selectively to said respective anode leads in response to said information data; an anode voltage detection circuit for designating a prescribed anode lead of said respective anode leads as an anode lead that is the subject of detection and obtaining an anode voltage value by detecting a voltage value on this anode lead designated as the subject of detection; a control circuit for supplying to said anode drive switch prescribed information data to cause said drive current to be supplied to at least said anode lead designated as the subject of detection; and a forward voltage input circuit for inputting as forward voltage value said anode voltage value only while said prescribed information data is being supplied to said anode drive switch; wherein said anode power source circuit adjusts said anode power source voltage in response to said forward voltage value that is input by said forward voltage input circuit.