Readout circuit for touch panel

Details Readout circuit for touch panel Readout circuit for touch panel

2011-01-04

2011-01-04

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Responsive to proximity or touch

Reexamination Certificate

active

07863966

ABSTRACT:
A readout circuit for touch panel includes first and second switches, an operational amplifier (OP-AMP), a feedback capacitor, a comparison unit, and a counter. A first input terminal and an output terminal of the OP-AMP are respectively coupled to a second terminal of the first switch and an input terminal of the comparison unit. A second input terminal of the OP-AMP receives a reference voltage. Two terminals of the feedback capacitor and the second switch are respectively coupled to the first input terminal and the output terminal of the OP-AMP. The comparison unit selects first or second threshold voltages to compare with an output of the OP-AMP according to a output of the comparison unit. An input terminal of the counter receives the output of the comparison unit.

REFERENCES:
patent: 5880538 (1999-03-01), Schulz
patent: 6362632 (2002-03-01), Livingston
patent: 7782068 (2010-08-01), Kuang

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