Coordinate position detection device for touch panel

Details Coordinate position detection device for touch panel Coordinate position detection device for touch panel

2007-02-07

2010-11-02

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

For x or y coordinate determination

C345S179000, C345S104000, C345S173000

Reexamination Certificate

active

07825832

ABSTRACT:
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.

REFERENCES:
patent: 5798756 (1998-08-01), Yoshida et al.
patent: 5854881 (1998-12-01), Yoshida et al.
patent: 6239788 (2001-05-01), Nohno et al.
patent: 6373474 (2002-04-01), Katabami
patent: 2003-66417 (2003-03-01), None
patent: 2005-301974 (2005-10-01), None
International Search Report for PCT/JP2007/052078, mailed April 10, 2007.

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