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An artificial retina chip made of a 128 x 128 pn-np variable-sensitivity photodetector array

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7 Author(s)
Funatsu, E. ; Semicond. Res. Lab., Mitsubishi Electr. Corp., Hyogo, Japan ; Hara, Kunihiko ; Toyoda, T. ; Miyake, Y.
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An artificial retina chip is an image detection device that, like biological retinas, can extract essential features directly from projected images. This paper presents an artificial retina chip consisting of a 128/spl times/128 array of pn-np variable-sensitivity photodetectors (VSPD's). This photodetector (PD) utilizes pn junctions and thus avoids the rather inflexible memory effect encountered in our previously reported device, which used Schottky contacts in a metal-semiconductor-metal (MSM) configuration. We introduce a novel "filter division" method for arbitrary two-dimensional (2-D) filter operation, and successfully employ it in a 2-D edge extraction task.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:7 ,  Issue: 2 )

Date of Publication:

Feb. 1995

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