Coordinate detection device capable of obviating the need of for

Details Coordinate detection device capable of obviating the need of for Coordinate detection device capable of obviating the need of for

1995-06-02

1998-08-25

Mengistu, Amare

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

178 18, G09G 500

Patent

active

057987564

ABSTRACT:
There is provided a coordinate detection device capable of preventing increase of development cost and reduction of yield and dispensing with additional investment for existing equipment. The coordinate detection device includes an LCD panel having electrodes and electrodes, an electric field generator which outputs an AC electric field from a tip end of its electrode, a differential amplifier, switching circuits which sequentially select electrodes of the LCD panel and connect the selected electrodes to the differential amplifier, and a coordinate detection circuit which detects coordinates of a position in which the electric field generator is located based on a timing at which the electrodes are selected and an output of the differential amplifier. A coordinate detection function can be achieved by means of the LCD panel having the same structure as that of an LCD panel provided specially for image display. Furthermore, there is no need to form a closed loop in the electrodes of the LCD panel, which obviates the need of providing any board opposite to four sides of the LCD panel.

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