Low-cost devices for touch control

Details Low-cost devices for touch control Low-cost devices for touch control

1992-01-27

1994-02-01

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

178 18, 178 19, G09G 302

Patent

active

052835588

ABSTRACT:
Low-cost devices for touch control by using a matrix of discrete composite switch contacts in close proximity, and x and y terminal measurable parameter such as resistance for touch position sensing and encoding. When a touch position is touched, the corresponding composite switch contacts simultaneously short a proportional portion of the x and y terminal resistance. These terminal resistance values are then converted to digital x and y cordinates of the touched position by A/D converters. Also, that the resistance between the last position sensing conductor and the ground return is three to five times larger than the resistance between all the other position sensing conductors of the first and second sheet eliminates the occasional error of detecting the normally untouched state as a touched state.

REFERENCES:
patent: 3304612 (1967-02-01), Proctor
patent: 4214122 (1980-07-01), Kley
patent: 4492819 (1985-01-01), Rodgers
patent: 4550316 (1985-10-01), Whetstore
patent: 4570149 (1976-02-01), Thornburg
patent: 4582955 (1986-04-01), Blesser
patent: 4717793 (1988-01-01), Kobayashi
patent: 4752655 (1988-06-01), Tajiri
patent: 5120907 (1992-06-01), Shirbori

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