Coordinate detection device capable of detecting coordinates usi

Details Coordinate detection device capable of detecting coordinates usi Coordinate detection device capable of detecting coordinates usi

1995-05-19

1998-12-29

Lao, Lun-Yi

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345174, 345179, 178 1807, 178 1903, G09G 336

Patent

active

058548815

ABSTRACT:
Provided is a coordinate detection device capable of preventing the increase of development cost and the reduction of yield and dispensing with additional investment for the existing equipment. There are provided an LCD panel having electrodes and electrodes, a magnetic field generator which outputs an AC magnetic field from a tip end of its electrode, a differential amplifier, switching circuits which sequentially select electrodes of the LCD panel and connect the electrodes to the differential amplifier, and a coordinate detection circuit which detects the coordinates of a position in which the magnetic 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 the 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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Okano et al. "Liquid crystals=applications", Tofuukan, 7th issue, 1992, pp. 98-105.

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