Light-emitting diode arrays with integrated photodetectors forme

Details Light-emitting diode arrays with integrated photodetectors forme Light-emitting diode arrays with integrated photodetectors forme

1996-03-27

1999-06-29

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347236, B41J 245, B41J 247, B41J 2435

Patent

active

059175346

ABSTRACT:
A monolithic device comprises an LED chip array that includes photodetectors formed on the device so that each photodetector is associated with a respective LED for detecting light output of the LED. The locations of the photodetectors and the respective rows of bond pads for the LEDs and photodetectors are such as to facilitate connection to associated current driver circuitry. The device is preferably used on an LED printhead. Methods and apparatus are provided for using the device in recording of images. Printheads using such devices allow for determinations of improper operation of the LEDs either in real time or during other times such as interframe per rods. Thus, LED malfunction may be caught promptly without need to stop production to allow a diagnostic photodetector to traverse over the LEDs.

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patent: 5253934 (1993-10-01), Potucek et al.
patent: 5300960 (1994-04-01), Pham et al.
patent: 5389953 (1995-02-01), Agar et al.

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