Liquid crystal position determining system and wand device

Details Liquid crystal position determining system and wand device Liquid crystal position determining system and wand device

1989-10-06

1990-12-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340707, G01V 904, G09G 302

Patent

active

049773151

ABSTRACT:
A coordinate position determining system and method includes a liquid crystal material separating first and second groups of conductors. The tablet is at least partially light transmissive, but may include a partially reflective layer. The first and second groups or conductors are sequentially scanned at different times. A wand adapted to be positioned against the tablet includes a light detector, and may also include a light source.

REFERENCES:
patent: 4188566 (1980-02-01), Miwa et al.
patent: 4531230 (1985-07-01), Brogardh
patent: 4602907 (1986-07-01), Foster
patent: 4697175 (1987-09-01), Macdonald
patent: 4785564 (1988-11-01), Gurtler
patent: 4794634 (1988-12-01), Torihata et al.
patent: 4803737 (1989-02-01), Sato et al.
patent: 4839634 (1989-06-01), More et al.

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