Reducing pixel footprint in a light emitter array using organic

Details Reducing pixel footprint in a light emitter array using organic Reducing pixel footprint in a light emitter array using organic

1997-01-17

2000-10-24

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347247, B41J 247

Patent

active

061375233

ABSTRACT:
An integrating xerographic light emitter array includes circuitry for using organic light emitting diodes (OLEDs) operated at modest light levels to expose a photoreceptor drum or belt. This is accomplished by staging an array of the emitters in the slow scan direction and clocking the data through pixel driving shift registers synchronously with the movement of a photoreceptor past the array in the slow scan direction. Increased emitter lifetime and the ability to operate at lower light levels are achieved in proportion to the number of stages. The method for operating the xerographic light emitter array includes transmitting data signals to the first row pixels, shifting the data signals down the columns synchronously with photoreceptor movement and supplying current to drive the OLEDs. Multicolor devices for xerocolography and tandem or multipass color architectures are straightforward extensions of this design.

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