Patent ID: 7154455

Claim:
A display driver circuit having a driver transistor for supplying a current from a power supply to an electroluminescence element, for controlling the driver transistor to control light emission of the electroluminescence element, the display driver circuit comprising: a data line driven by a current corresponding to data related to an amount of light emission; a gate line driven by a selection signal for selecting an electroluminescence element which is to emit light; a selection transistor having one terminal connected to the data line and a gate connected to the gate line; a voltage converter transistor having one terminal connected to the other terminal of the selection transistor, the other terminal connected to a power supply, and a gate connected to the gate of the driver transistor; a short-circuiting transistor connecting the other terminal of the selection transistor and the gate of the voltage converter transistor and having a gate connected to the gate line; an erase transistor having one terminal connected to the gate of the driver transistor, the other terminal connected to the power supply, and a gate connected to an erase line; and a capacitor for storing a voltage, connected to the gate of the driver transistor, wherein the data line is driven with a current corresponding to data and the gate line is driven so that the selection transistor and the short-circuiting transistor are switched on and the current corresponding to the data flows through the voltage converter transistor to charge the capacitor to a voltage corresponding to the data, a current corresponding to the charged voltage of the capacitor is applied to the electroluminescence element through the driver transistor, and, after a predetermined emission period has elapsed, the erase line is driven to switch the erase transistor on so as to discharge the capacitor.