Key making use of the properties of a liquid crystal
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United States of America Patent
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Aug 27, 1991
Grant Date -
N/A
app pub date -
Jun 5, 1989
filing date -
Jun 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A touch sensor comprises a liquid crystal cell (10) and detector means (40, 50A, 50B) responsive to a change in the dielectric constant of the liquid crystal. The detector means comprise an HF electrical signal generator (40) together with integration means (50A, 50B) suitable for integrating the charge created by any change in the dielectric constant of the liquid crystal (14).
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