Transparency viewing apparatus having display and masking functions
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United States of America Patent
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Feb 13, 1996
Grant Date -
N/A
app pub date -
Mar 31, 1994
filing date -
Jul 11, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus having the dual function of display and optical mapping of transparencies which includes a viewing surface to which a transparency is adjacent, a segmented surface underlying the viewing surface and having a plurality of segments at least two of which have a controllable opacity, at least one photodetector underlying the segmented surface which detects light passing through the viewing surface and the segmented surface and generates detected light signals responsive to the intensity of the detected light and a mapping system which, in an opacity determination mode, sequentially varies of the opacity of selected segments and which determines the opacity of portions of the transparency based on signals supplied during such sequential variation.
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