Coordinate input device

Details Coordinate input device Coordinate input device

1997-02-12

1999-05-18

Wu, Daniel J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345156, G08G5/00

Patent

active

059054891

ABSTRACT:
An M-sequence signal is generated in an M-sequence generation circuit, and the M-sequence signal, which is successively delayed by a column-electrode driving circuit or a row-electrode driving circuit, is applied to a column-electrode group or a row-electrode group. A correlator finds a correlation between the M-sequence signal and a detection signal that has been detected by amplifying electrostatically induced voltage that appeared in the detection electrode of an electronic pen so that a position specified by the electronic pen is detected by a detection circuit as a coordinate signal. Thus, it is possible to obtain a coordinate detection signal having a superior S/N ratio without reducing the coordinate detection speed, and consequently to carry out a coordinate detecting operation with high precision.

REFERENCES:
patent: 4639720 (1987-01-01), Rympaiski et al.
patent: 4639730 (1987-01-01), Rympalski et al.
patent: 4922061 (1990-05-01), Meadows et al.
patent: 5592197 (1997-01-01), Tagawa
patent: 5631670 (1997-05-01), Tomiyoshi et al.

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