Touch sensor array systems and display systems incorporating suc

Details Touch sensor array systems and display systems incorporating suc Touch sensor array systems and display systems incorporating suc

1990-04-30

1993-12-14

Weldon, Ulysses

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

178 18, 345174, 345104, H03K 1794

Patent

active

052707113

ABSTRACT:
A touch sensor array system comprises an array of sensor elements (12) each actively addressable by means of a switch device (16), for example two terminal devices such as diodes or MIMs, or TFTs, controlled by a driver circuit (22) to load a predetermined charge into a capacitor (14) of the element. Touching a sensor element dissipates this charge which is detected during a subsequent addressing stage by sensing particular charging characteristics with a monitoring circuit (24). With a row and column array, the elements (12) are addressed one row at a time at regular intervals using a row conductor (18) common to a row of elements. Each column of elements shares a column conductor (20) connected to the monitoring circuit. Various schemes are described enabling wired or isolated styli or a finger to be used as position designating means. The array is fabricated using thin film deposition techniques and high resolution arrays are easily achieved. The system can be used as a display overlay.

REFERENCES:
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patent: 3877029 (1975-04-01), Larson et al.
patent: 4145748 (1974-03-01), Eichelberger et al.
patent: 4290061 (1981-09-01), Serrano
patent: 4827085 (1989-05-01), Yaniv et al.
patent: 4839634 (1989-06-01), More et al.

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