Patent ID: 6452342
Filing Date: 2002-09-17
Classification: B41J

Abstract:
A self-scanning light-emitting device, comprising:an array of a plurality of three-terminal light-emitting elements linearly arranged each having a control electrode for controlling threshold voltage or current; electrical means having unidirectional characteristic to voltage or current for connecting the control electrodes of neighboring light-emitting elements to each other; two clock pulse lines for applying two-phase clock pulses 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 causing 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, and the other phase clock pulse of the two-phase clock pulses causing the light-emitting element neighbored to the turned-on light-emitting element to turn on; and a power supply line connected to each of the control electrodes of the light-emitting elements via a load resistor, respectively; wherein the resistance of the load resistor connected to the light-emitting element to be turned on at first is selected to be smaller than respective resistance of other load resistors.