Method and device for hybrid touch sensing
First Claim
1. A method for hybrid touch sensing, for detecting a normal touch and a force touch concurrently, the method comprising steps of:
- providing a first driving signal to a first capacitor, wherein the first driving signal is a periodic signal with a first frequency, capacitance of the first capacitor changes in response to a first touch, the first touch is one of the normal touch and the force touch;
providing a second driving signal to a second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency, capacitance of the second capacitor changes in response to a second touch, the second touch is the other one of the normal touch and the force touch;
generating a composite sensing signal by feeding the first driving signal and the second driving signal to a front-end circuit; and
extracting information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently.
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Abstract
A method for hybrid touch sensing for detecting a normal touch and a force touch concurrently is provided. The method includes the following steps. Provide a first driving signal to a first capacitor, wherein the first driving signal is a periodic signal with a first frequency. Provide a second driving signal to a second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency. Generate a composite sensing signal by feeding the first driving signal and the second driving signal to a front-end circuit. Extract information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently.
9 Citations
20 Claims
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1. A method for hybrid touch sensing, for detecting a normal touch and a force touch concurrently, the method comprising steps of:
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providing a first driving signal to a first capacitor, wherein the first driving signal is a periodic signal with a first frequency, capacitance of the first capacitor changes in response to a first touch, the first touch is one of the normal touch and the force touch; providing a second driving signal to a second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency, capacitance of the second capacitor changes in response to a second touch, the second touch is the other one of the normal touch and the force touch; generating a composite sensing signal by feeding the first driving signal and the second driving signal to a front-end circuit; and extracting information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for hybrid touch sensing, for detecting a normal touch and a force touch concurrently, the device comprising:
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a first capacitor, wherein capacitance of the first capacitor changes in response to a first touch, the first touch is one of the normal touch and the force touch; a second capacitor, wherein capacitance of the second capacitor changes in response to a second touch, the second touch is the other one of the normal touch and the force touch; a first driving source, providing a first driving signal to the first capacitor, wherein the first driving signal is a periodic signal with a first frequency; a second driving source, providing a second driving signal to the second capacitor, wherein the second driving signal is a periodic signal with a second frequency different from the first frequency; a front-end circuit, configured to generate a composite sensing signal in response to the first driving signal and the second driving signal; and a processing circuit, configured to extract information from the composite sensing signal to calculate a first change in capacitance of the first capacitor and a second change in capacitance of the second capacitor to detect the normal touch and the force touch concurrently. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification