Graphics tablet using a permuted trace ordering scheme

Details Graphics tablet using a permuted trace ordering scheme Graphics tablet using a permuted trace ordering scheme

1987-04-24

1989-02-21

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340707, 178 18, G09G 300

Patent

active

048069183

ABSTRACT:
A graphics tablet is presented which has an x-y grid of wire traces embedded on it. Drive wires are coupled to the trace wires in both the x-direction and the y-direction. When a stylus is placed in contact with the graphics tablet, the location of a sector of the graphics tablet where the stylus contacts the graphics tablet may be determined by sequentially placing a signal on each drive wire and measuring the strength of the signal received by the stylus. The closer the stylus is to a particular trace, the stronger the signal which is received by the stylus from the drive wire coupled to that trace. The identity of a plurality of drive wires in the x-direction and a plurality of wires in the y-direction with the strongest received signal can be used to determine a unique address for the location of the sector of the graphics tablet where the stylus contacts the graphics tablet.

REFERENCES:
patent: 3342935 (1967-09-01), Leifer et al.
patent: 3975592 (1976-08-01), Carvey
patent: 4205199 (1980-05-01), Mochizuki
patent: 4213005 (1980-07-01), Cameron
patent: 4255617 (1981-03-01), Carau, Sr. et al.
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4534060 (1985-08-01), Ward
patent: 4560830 (1985-12-01), Perl
patent: 4577057 (1986-03-01), Blesser
"A High-Quality, Low-Cost Graphics Tablet", Stavely, Donald J., Jan. 1981, Hewlett-Packard Journal, pp. 15-24.
"Easy-to-Use, High-Resolution Digitizer Increases Operator Efficiency" Carau, Frank P., Dec. 1978, Hewlett-Packard Journal, pp. 2-13.

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