Patent ID: 7233322

Claim:
A display panel drive circuit which supplies current to a plurality of IC chips, including at least a first IC chip and a second IC chip, the display panel drive circuit comprising: a first anode line drive circuit on the first IC chip, the first anode line drive circuit comprising: a first current source which outputs a first reference current for a first current mirror; a first internal circuit which generates drive current for driving a first display panel using a second current mirror circuit; and a first switching circuit that outputs a first output current to the first internal circuit; and a second anode line drive circuit, comprising: a second current source which outputs a second reference current for the first current mirror; and a second internal circuit which generates drive current for driving a second display panel using a third current mirror; a second switching circuit that outputs a second output current to the second internal circuit; wherein the first and second switching circuits: receive the first reference current and the second reference current, and respectively generate the first and second output currents by switching the first switching circuit and the second switching circuit to receive either the first or second reference currents in accordance with a predetermined duty ratio.