Patent ID: 6504309
Filing Date: 2003-01-07
Classification: B41J,G09G

Abstract:
A driver circuit for a self-scanning light-emitting element array having such a structure that a plurality of three-terminal light-emitting elements are linearly arranged each having a control electrode for controlling threshold voltage or current, the control electrodes of neighboring light-emitting element are connected to each other via electrical means having unidirectional characteristic to voltage or current, two-phase clock pulses are applied alternately to one of two terminals except the control electrode of each light-emitting element, one phase clock pulse of the two-phase clock pulses causes the threshold voltage or current of the light-emitting elements in the vicinity of a turned-on light-emitting element to vary via the electrical means, the other phase clock pulse of the two-phase clock pulses causes the light-emitting element neighbored to the turned-on light-emitting element to turn on, and the turned-on light-emitting element is caused to be in a write light-emission condition by supplying a write current thereto, comprisinga circuit for generating the clock pulse including a first pulse voltage source, a first buffer having an input terminal to which a pulse voltage from the first pulse source is supplied, and a first resistor connected to an output terminal of the first buffer; and a circuit for generating the write current including a second pulse voltage source, a second buffer having a gate terminal to which a pulse voltage from the second pulse source is supplied, an input terminal of the second buffer being connected to a power supply, and a second resistor connected to an output terminal of the second buffer.