Control circuit for array of light-emitting diodes

Details Control circuit for array of light-emitting diodes Control circuit for array of light-emitting diodes

1994-05-04

1995-06-13

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358482, 2502081, H04N 1028, H04N 103

Patent

active

054248558

ABSTRACT:
An array of LEDs is controlled by a control circuit so as to emit light in a write mode and sense light in a read mode. In the read mode, each LED is alternately charged for a first interval, then allowed to discharge by flow of photocurrent for a second interval. At the end of the second interval, just before charging of the LED begins again, the anode voltage of the LED is read by coupling the anode of the LED to an output terminal for a third interval. The third interval of each LED may coincide with the first interval of the preceding LED in tile array, so that each LED is read while the preceding LED is being charged.

REFERENCES:
patent: 4424523 (1984-01-01), Snelling et al.
patent: 4424524 (1984-01-01), Daniele

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