Employing gray codes for pen detection

Details Employing gray codes for pen detection Employing gray codes for pen detection

1997-05-07

1999-09-14

Shankar, Vijay

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345174, 178 1801, 178 1803, 178 1901, 178 1907, G08C 2100, G09G 500

Patent

active

059529997

ABSTRACT:
A graphic tablet includes a number of parallel electrodes whereto a series of patterns is presented in order to determine the position of a pen relative to the electrodes. As a result of such presentation, a series of code elements is formed on an electrode, which series can be picked up by the pen and is representative of the relevant electrode. When the patterns are suitably chosen, a short series of patterns suffices, so that the determination of the position requires less time.

REFERENCES:
patent: 3819857 (1974-06-01), Inokuchi
patent: 4126760 (1978-11-01), Gordon
patent: 5210380 (1993-05-01), McDermott
patent: 5416280 (1995-05-01), McDermott

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