Method and apparatus for applying a potential difference across a selected region of a substrate
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United States of America Patent
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Oct 1, 1991
Grant Date -
N/A
app pub date -
Jul 31, 1989
filing date -
Jul 31, 1989
priority date (Note) -
Expired
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Abstract
A method for selectively applying a voltage to selected points on a surface is disclosed. The method utilizes a layer of photo-conductive material in contact with the surface in question. The layer of photo-conductive material is illuminated in the region immediately above the selected points so as to cause the voltage on an electrode bonded to one surface of the photo-conductive region to be electrically connected to the selected points.
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