High quality light emitting diode array imaging system

Details High quality light emitting diode array imaging system High quality light emitting diode array imaging system

1976-12-13

1978-02-14

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358240, 358241, H04N 566

Patent

active

040743209

ABSTRACT:
Described are a method and apparatus for developing a high quality pictorial field display from transmitted facsimile data. The display, which comprises an array of two-level ("on"/"off") energy sources such as light-emitting diodes, achieves multitone operation by digitally controlling the time duration during which the energy sources are activated. Inherent output errors of the energy sources are corrected by multiplying received data signals destined for a particular energy source with a predetermined correction factor characteristic of the particular energy source. The multiplied data is stored in a multiport memory connected to the energy sources, permitting the simultaneous activation of the energy sources in the array.

REFERENCES:
patent: 3790705 (1974-02-01), Kamin
patent: 3793629 (1974-02-01), Sharpless
patent: 3800079 (1974-03-01), McNeil et al.
patent: 3830972 (1974-08-01), Siverling et al.
patent: 4032975 (1977-06-01), Malueg et al.

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