A driver IC of a light-emitting diode array head for an electronic photograph printer includes a current mirror circuit having a reference element and at least an output element so as to produce a reference current by use of a digital signal as an input thereto, a reference current source capable of...http://www.google.ca/patents/US4967192?utm_source=gb-gplus-sharePatent US4967192 - Light-emitting element array driver circuit
