US 2012/0056842 A1Published application

Sensing Apparatus for Touch Panel and Sensing Method Thereof

AssigneeHimax Technologies Limited

InventorYaw-Guang Chang

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Abstract

A sensing apparatus for a touch panel includes: sensitive capacitors formed between intersections of first electrodes and the second electrodes; a first sensing circuit, for positioning two locations of the first electrodes by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the first electrodes; a second sensing circuit, for positioning two locations of the second electrodes by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the second electrodes; and a third sensing circuit for sequentially positioning two locations of the scanned electrodes by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the scanned electrodes, wherein a control circuit determines the two touch points according to the two locations of the first electrodes, and the two locations of the second electrodes and the two locations of the scanned electrodes.

Claims10

Dependent claims

A sensing apparatus for a touch panel, adapted to sense two touch points on the touch panel when the touch panel is being touched with two objects, comprising:

a plurality of first electrodes formed along a first axis;
a plurality of second electrodes formed along a second axis;
a plurality of sensitive capacitors formed between intersections of the first electrodes and the second electrodes, wherein capacitance values of the sensitive capacitors are changed when the touch panel is touched with objects;
a first sensing circuit, for positioning two locations of the first electrodes touched by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the first electrodes;
a second sensing circuit, for positioning two locations of the second electrodes by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the second electrodes, while being synchronously activated with the first sensing circuit;
a scan driving circuit for sequentially scanning one of the first electrodes and the second electrodes;
and
a third sensing circuit for sequentially positioning two locations of the scanned electrodes touched by the two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the scanned electrodes,
wherein the two touch points are determined according to the two locations of the first electrodes, and the two locations of the second electrodes and the two locations of the scanned electrodes.

6 more elements

A sensing method for a touch panel, adapted to sense two touch points when the touch panel is being touched with two objects, wherein a plurality of sensitive capacitors are formed between intersections of a plurality of first electrodes and the second electrodes, and capacitance values of the sensitive capacitors are changed when the touch panel is touched with objects, comprising:

positioning two locations of the first electrodes touched by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the first electrodes by a first sensing circuit;
positioning two locations of the second electrodes by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the second electrodes by a second sensing circuit, while being synchronously activated with the first sensing circuit;
sequentially scanning one of the first electrodes and the second electrodes by a scan driving circuit;
and
sequentially positioning two locations of the scanned electrodes touched by the two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the scanned electrodes by a third sensing circuit;
determining the two touch points according to the two locations of the first electrodes, and the two locations of the second electrodes and the two locations of the scanned electrodes by a control circuit.

3 more elements

Dependencies are inferred from the claim text.