Display-integrated coordinate input device

Details Display-integrated coordinate input device Display-integrated coordinate input device

1997-07-03

1999-08-17

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

G09G 500

Patent

active

059400641

ABSTRACT:
A liquid crystal module comprises a liquid crystal panel including mutually orthogonal row electrodes and column electrodes and a liquid crystal layer sealed between the electrodes as a display element, a row electrode driving circuit driving the row electrodes of the liquid crystal panel, and a column electrode driving circuit driving the column electrodes. A detecting electrode detects scanning signals applied to the row and column electrodes of the liquid crystal panel by electrically coupling to the electrodes with electrostatic coupling capacity. A coordinate detecting circuit converts the signals obtained from the detecting electrode into row and column coordinates. A correction arithmetic circuit corrects positional differences by using correction parameters of the device which have been obtained from output values of the coordinate detecting circuit beforehand. The display-integrated coordinate input device improves detection precision at the edges of a matrix panel.

REFERENCES:
patent: 5418551 (1995-05-01), Ise
patent: 5491706 (1996-02-01), Tagawa et al.
patent: 5534886 (1993-05-01), Nomura et al.
patent: 5581274 (1996-12-01), Tagawa

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