Light biased photoresponsive array having low conductivity regions separating individual cells
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United States of America Patent
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Jun 25, 1991
Issued Date -
N/A
app pub date -
Jan 25, 1990
filing date -
Apr 17, 1987
priority date (Note) -
Expired
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Abstract
A high density planar array of substrate-supported, thin film diodes constituting photoresponsive semiconductor elements is placed between a document to be read and a light source for illuminating the document. The document is illuminated by the light source via windows in the array, reflected light from the document impinging on the photoresponsive elements constituted by the diodes which are electronically interrogated to provide a signal which is indicative of image information on the document. The light source directly illuminates small portions of each diode to establish a discharge or bias current that makes the array more sensitive and responsive. The high density diodes of the array can be formed in a manner that minimizes leakage current between adjacent diodes.
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