US 10,768,744 B2Granted

Touch panel and controlling method of touch panel

AssigneeHimax Technologies Limited

InventorsYaw-Guang Chang, Wei-Song Wang

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Abstract

The present invention provides a touch panel and a controlling method thereof. The controlling method comprises: during a display period of the touch panel, turning on a bias voltage generation circuit to generate a bias voltage signal, turning on a reverse bias voltage generation circuit to generate a reverse bias voltage signal, turning on a positive voltage generation circuit to generate a positive voltage signal, turning on a negative voltage generation circuit to generate a negative voltage signal, and turning off a modulating voltage generation circuit; during a touch period of the touch panel, turning off the bias voltage generation circuit, the reverse bias voltage generation circuit, the positive voltage generation circuit, and the negative voltage generation circuit, and turning on the modulating voltage generation circuit to generate a modulating voltage signal, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel.

Claims10

Dependent claims

A touch panel, comprising:

a bias voltage generation circuit, for being turned on to generate a bias voltage signal during a display period of the touch panel and being turned off during a touch period of the touch panel;
a reverse bias voltage generation circuit, for being turned on to generate a reverse bias voltage signal during the display period of the touch panel and being turned off during the touch period of the touch panel;
a positive voltage generation circuit, for being turned on to generate a positive voltage signal during the display period of the touch panel and being turned off during the touch period of the touch panel;
a negative voltage generation circuit, for being turned on to generate a negative voltage signal during the display period of the touch panel and being turned off during the touch period of the touch panel;
a modulating voltage generation circuit, for being turned on to generate a modulating voltage signal during the touch period of the touch panel and being turned off during the display period of the touch panel, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel;
a first capacitor, for coupling the modulating voltage signal to an output terminal of the bias voltage generation circuit;
a second capacitor, for coupling the modulating voltage signal to an output terminal of the reverse bias voltage generation circuit;
a third capacitor, for coupling the modulating voltage signal to an output terminal of the positive voltage generation circuit;
and
a fourth capacitor, for coupling the modulating voltage signal to an output terminal of the negative voltage generation circuit.

7 more elements

A controlling method of a touch panel, comprising:

during a display period of the touch panel, turning on a bias voltage generation circuit to generate a bias voltage signal, turning on a reverse bias voltage generation circuit to generate a reverse bias voltage signal, turning on a positive voltage generation circuit to generate a positive voltage signal, turning on a negative voltage generation circuit to generate a negative voltage signal, and turning off a modulating voltage generation circuit;
during a touch period of the touch panel, turning off the bias voltage generation circuit, the reverse bias voltage generation circuit, the positive voltage generation circuit, and the negative voltage generation circuit, and turning on the modulating voltage generation circuit to generate a modulating voltage signal, wherein the modulating voltage signal is same as a touch sensing signal of the touch panel;
using a first capacitor to couple the modulating voltage signal to an output terminal of the bias voltage generation circuit;
using a second capacitor to couple the modulating voltage signal to an output terminal of the reverse bias voltage generation circuit;
using a third capacitor to couple the modulating voltage signal to an output terminal of the positive voltage generation circuit;
and
using a fourth capacitor to couple the modulating voltage signal to an output terminal of the negative voltage generation circuit.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/384,850Filed 15 Apr 2019 · us provisional application
Priority: 15 Jun 2018
Published: US 2019/0384446 A119 Dec 2019
Granted: 8 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G06F 3/0416
Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means: control or interface arrangements specially adapted for…
G06F 3/04184
For error correction or compensation, e.g. based on parallax, calibration or alignment: synchronisation with the driving of the display or the…
G05F 3/10
Wherein the variable is DC: using uncontrolled devices with non-linear characteristics
G06F 2203/04102
Indexing scheme relating to G06F3/041 - G06F3/045: flexible digitiser, i.e. constructional details for allowing the whole digitising part of a…

Family

Application62/685,287Us provisional application · filed 15 Jun 2018
Application62/687,216Us provisional application · filed 19 Jun 2018
US 2019/0384446 A1Pre-grant publication · published 19 Dec 2019
US 10,768,744 B2This patent

From the US filing history. Foreign family members aren’t listed.

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