Sharp Kabushiki Kaisha Corporation

Saburoh Miyamoto

Takeshi Yamaguchi

Tomohiko Nishimura

Hiroshi Hamada

Toshihisa Nakano

A touch-sensored display deviceaccording to the present invention includes: a counter substratedisposed on a viewer side of an active matrix substratevia a display medium layer, the counter substratehaving a counter electrodewhich opposes pixel electrodes; a display panel driving circuitfor supplying to the counter electrodea common voltage which undergoes periodic inversion in polarity; a transparent conductive filmfor position detection placed so as to oppose the counter electrodevia the counter substrate; a strobe signal generation circuitfor generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a noise-cut current signal generation circuitfor generating a noise-cut current signal which is obtained by eliminating based on the strobe signal a predetermined portion from a current flowing from a terminal connected to the transparent conductive filmfor position detection.

Display device with touch sensor, and drive method for the device

A coordinate position detection device includes: charging circuits having both the capability of charging a coupling capacitance in a capacitive-coupling touch panel with a position-detection resistive film whose potential periodically varies between a positive potential and a negative potential and the capability of restoring the charged coupling capacitance to its state prior to charging; current-to-voltage conversion circuits converting into a voltage the total amount of charging currents of the coupling capacitance after the charging circuits supply the charging current to the coupling capacitance a plurality of times; and a computation device detecting the coordinate position of a touched area based on the outputs of the current-to-voltage conversion circuits.

Growing community of inventors

Kizugawa, Japan

Saburoh Miyamoto