Key making use of the properties of a liquid crystal

Details Key making use of the properties of a liquid crystal Key making use of the properties of a liquid crystal

1989-06-05

1991-08-27

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340711, 340765, 340784, 340794, G09G 302, G09G 336, G09G 126

Patent

active

050437100

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).

REFERENCES:
patent: 4176575 (1979-12-01), Munch
patent: 4224615 (1980-09-01), Penz
patent: 4290061 (1981-09-01), Serrano
patent: 4291303 (1981-09-01), Cutler et al.
patent: 4680429 (1987-07-01), Murdock et al.
patent: 4694279 (1987-09-01), Meno
patent: 4910504 (1990-03-01), Eriksson
Electronic Letters, vol. 8, No. 25/26, Dec., 1982, pp. 1106-1108; M. J. Bradshaw et al., "New Form of Liquid Crystal Touch Switch".
Review of Scientific Instruments, vol. 55, No. 1, Jan., 1984, pp. 79-87; F. I. Mopsi, "Precision Time-Domain Dielectric Spectrometer".

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