Liquid crystal shutter for backlit digitizer
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United States of America Patent
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-
Dec 22, 1992
Issued Date -
N/A
app pub date -
Apr 15, 1992
filing date -
Oct 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digitizer system comprises a source of a light for producing an image, a shutter, and a transparent or translucent digitizer tablet. The source is positioned to direct the image to the tablet via the shutter. The shutter comprises a liquid crystal layer and transparent planar conductors on opposite surfaces of the layer. The system further comprises a source of an adjustable voltage connected between the planar conductors for adjusting the transmissivity of the shutters.
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