Control device and method with compensation of coordinate...

Details Control device and method with compensation of coordinate... Control device and method with compensation of coordinate...

2006-09-12

2010-11-23

Lao, Lun-Yi (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S173000, C178S018010, C178S018020, C178S018050

Reexamination Certificate

active

07839393

ABSTRACT:
A control device for a capacitive touch panel has multiple voltage driving/current detecting circuits respectively connected to four corners of a top conductive layer of the touch panel. An auxiliary voltage driving/current detecting circuit is connected to a bottom conductive layer of the touch panel. When the touch panel is pressed, all voltage driving/current detecting circuits detect first current values at four corners of the top conductive layer. The auxiliary voltage driving/current detecting circuit also detects a second current value from the bottom conductive layer. The second current value is used to compensate all first current values so that the coordinate information of the position being pressed can be exactly calculated.

REFERENCES:
patent: 5940065 (1999-08-01), Babb et al.
patent: 6333736 (2001-12-01), Sandbach
patent: 6373474 (2002-04-01), Katabami
patent: 6977646 (2005-12-01), Hauck et al.
patent: 7355592 (2008-04-01), Hong et al.
patent: 7362313 (2008-04-01), Geaghan et al.
patent: 2005/0041018 (2005-02-01), Philipp

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