Fujitsu Component Limited

Shiro Hirota

Nobuyoshi Shimizu

Norio Endo

Satoshi Sakurai

Koichi Kondoh

Disclosed is a touch panel including an upper conductive layer; a lower conductive layer facing the upper conductive layer with an interval between the upper conductive layer; a capacitive sensing unit that detects a coordinate position by a capacitive coupling under a condition where a predetermined electric potential is applied to the upper conductive layer; and a resistive sensing unit that detects a coordinate position based on an electric potential at a position where the upper conductive layer and the lower conductive layer contact under a condition where a potential gradient is generated on either one of the upper conductive layer and the lower conductive layer.

Touch panel and method of detecting coordinate position

A coordinate detecting device includes a resistive film disposed on a quadrangular substrate; a power source for applying a voltage to the resistive film; four electrodes connected to the power source and disposed in four corners of the resistive film; four switches each disposed between the power source and a corresponding electrode; four ammeters for measuring currents flowing through corresponding electrodes; and a grounded conductive film for detecting coordinates of a contact point on the resistive film when the conductive film is brought in contact with the resistive film. The voltage is applied sequentially to the electrodes by opening and closing the switches. When the conductive film is brought in contact with the resistive film, the ammeters sequentially measure currents flowing through the corresponding electrodes. The coordinates of the contact point are detected based on positions of the electrodes and resistances obtained using the measured currents.

Growing community of inventors

Tokyo, Japan

Shiro Hirota