Coordinate input device

Details Coordinate input device Coordinate input device

1997-06-02

1998-11-03

Hofsass, Jeffery A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345156, 345174, 178 18, 178 19, G09G 500

Patent

active

058316000

ABSTRACT:
There is provided a coordinate input device in which when the coordinate position of a contact portion on a tablet by a coordinate input object is to be detected, influence of external noise is minimized to improve the reliability of detection of the coordinate position. The coordinate input device comprises a tablet scanned by one scan signal selected from a plurality of scan signals having different frequencies, and a coordinate data generation section for generating coordinate data representing a coordinate position of a contact portion when a coordinate input object is brought into contact with the tablet, wherein when the tablet is to be scanned with a scan signal, the coordinate data formation section sequentially selects the plurality of scan signals at least once a selecting operation, measures levels of noise included in data output from the tablet each time the selecting operation is performed, and then uses a scan signal representing a minimum noise level of the measured noise levels to scan the tablet.

REFERENCES:
patent: 4476463 (1984-10-01), Ng. et al.
patent: 4698461 (1987-10-01), Meadows et al.
patent: 5305017 (1994-04-01), Gerpheide
patent: 5359156 (1994-10-01), Chan et al.

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