US 2014/0368459 A1Published application

Touch device and sensing circuit thereof

AssigneeIntegrated Solutions Technology Inc.

InventorCHIA- CHENG LEI

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Abstract

A touch device includes a touch panel and a sensing circuit. The touch panel has vertical electrode-lines and horizontal electrode-lines. The sensing circuit includes a scan signal generator, which sequentially generates a plurality of scan signals to the plurality of horizontal electrode-lines. A plurality of sensing units senses the change in capacitance of the plurality of vertical electrode-lines and outputs a first sensing voltage and a second sensing voltage. A subtractor senses the difference between the first and the second sense voltages to output a horizontal voltage difference or a vertical voltage difference. When one of the sensing unit outputs the first and the second sensing voltages, the subtractor outputs the horizontal voltage difference between the two adjacent horizontal electrode-lines. When two adjacent sensing units output the first and the second sensing voltages, the subtractor output the vertical voltage difference between the two adjacent vertical electrode-lines.

Claims10

Dependent claims

A touch device, comprising:

a touch panel, comprising a plurality of horizontal electrode-lines and a plurality of vertical electrode-lines crossing each other, wherein the plurality of horizontal electrode-lines and the plurality of vertical electrode-lines are electrically insulated to each other;
and
a sensing circuit, the sensing circuit comprising:
a scan signal generator, for generating a plurality of scan signals to the plurality of horizontal electrode-lines in a predetermined duration;
a plurality of sensing units, coupled to plurality of vertical electrode-lines respectively, for sensing a capacitance variation of the plurality of vertical electrode-lines, so as to output a first sensing voltage and a second sensing voltage;
and
a subtractor, coupled to the plurality of sensing units, for sensing a difference between the first sensing voltage and the second sensing voltage, so as to output a horizontal voltage difference or a vertical voltage difference respectively;
wherein the first sensing voltage and the second sensing voltage are outputted by one of the plurality of sensing units or by two adjacent sensing units, when the first sensing voltage and the second sensing voltage are outputted by one of the plurality of sensing units, the subtractor outputs the horizontal voltage difference corresponding to the two adjacent horizontal electrode-lines, when the first sensing voltage and the second sensing voltage are outputted by the two adjacent sensing units respectively, the subtractor outputs the vertical voltage difference corresponding to two adjacent vertical electrode-lines.

5 more elements

A sensing circuit, for sensing a touch panel, the touch panel comprising a plurality of horizontal electrode-lines and a plurality of vertical electrode-lines crossing each other, wherein the plurality horizontal electrode-lines and the plurality of vertical electrode-lines are electrically insulated to each other, the sensing circuit comprising:

a scan signal generator, for generating a plurality of scan signals to the plurality of horizontal electrode-lines in a predetermined duration;
a plurality of sensing units, coupled to plurality of vertical electrode-lines respectively, for sensing a capacitance variation of the plurality of vertical electrode-lines, so as to output a first sensing voltage and a second sensing voltage;
and
a subtractor, coupled to the plurality of sensing units, for sensing a difference between the first sensing voltage and the second sensing voltage, so as to output a horizontal voltage difference or a vertical voltage difference respectively;
wherein the first sensing voltage and the second sensing voltage are outputted by one of the plurality of sensing units or by two adjacent sensing units, when the first sensing voltage and the second sensing voltage are outputted by one of the plurality of sensing units, the subtractor outputs the horizontal voltage difference corresponding to the two adjacent horizontal electrode-lines, when the first sensing voltage and the second sensing voltage are outputted by the two adjacent sensing units respectively, the subtractor outputs the vertical voltage difference corresponding to two adjacent vertical electrode-lines.

2 more elements

Dependencies are inferred from the claim text.