Coordinate input device and a program-recording medium for use i

Details Coordinate input device and a program-recording medium for use i Coordinate input device and a program-recording medium for use i

1997-09-03

2000-10-31

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345179, 178 1901, 178 1903, G09G 500

Patent

active

061409995

ABSTRACT:
A coordinate input device, which detects a signal outputted from a coordinate input pen on the surface of a tablet and converts it into coordinate data, is provided with: a phase-control circuit for shifting the phase of an ac signal from the device main body and for outputting the resulting signal to the coordinate input pen; a Sense Amp circuit for amplifying the ac signal with its phase changed that was outputted from the coordinate input pen and has been detected on the tablet surface; a phase-difference detection circuit for detecting the phase difference between the signal amplified by the Sense Amp circuit and the ac signal from the device main body; and a color conversion circuit for outputting, together with coordinate data, a specific piece of color information that corresponds to the phase difference that has been detected by the phase-difference detection circuit from pieces of color information that have been preliminarily stored in association with phase differences.

REFERENCES:
patent: 4730186 (1988-03-01), Koga et al.
patent: 5134689 (1992-07-01), Murakami et al.
patent: 5420607 (1995-05-01), Miller et al.
patent: 5717432 (1998-02-01), Miwa et al.

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