Drive device for a light-emitting panel, and a portable terminal device including a light-emitting panel

A portable terminal device comprising 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, said portable terminal device comprising:

• a transmitting/receiving circuit that performs transmission and reception of information data;
• a battery that generates power source voltage;
• an anode power source circuit that generates anode power source voltage using said power source voltage;
• a current source that generates drive current to cause said light-emitting elements to emit light based said anode power source voltage;
• an anode drive switch that supplies said drive current selectively to said respective anode leads in response to said information data;
• an anode voltage detection circuit that designates a prescribed anode lead of said respective anode leads as an anode lead that is the subject of detection and obtains an anode voltage value by detecting a voltage value on this anode lead designated as the subject of detection;
• a control circuit that supplies 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 that inputs 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.