Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-01-17
2000-06-06
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347130, 347238, G01D 1514
Patent
active
060725176
ABSTRACT:
An integrating xerographic light emitter array includes circuitry for operating an active matrix array of organic light emitting diodes (OLEDs). The light emitter array stages rows of emitters in the slow scan direction and moves the object image and synchronization with the photoreceptor. Grey scale resolution, increased emitter lifetime and the ability to operate at lower light levels are achieved in proportion to the number of stages. The entire printbar can be rewritten during each line time of the photoreceptor, which allows the exposure on any pixel on the photoreceptor to be varied in a number of grey levels from zero to the number of stages. Bringing a grey level signal to the photoreceptor allows improved continuous tone image quality and line placement. Additional grey resolution is obtained by analog driving of individual pixels. This technique is applicable to a variety of emitters or light valves, but is particularly suited to inexpensive OLEDs. Greater exposure uniformity results because each photoreceptor spot receives light from an ensemble of emitters. The integrating xerographic light emitter array can also use static digital memory which is particularly suited to random access display writing.
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Fork David K.
Popovic Zoran D.
Le N.
Nguyen Lamson D.
Xerox Corporation
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