Hybrid Touch Sensing via Composite Signal
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Solution Overview
Problem
Current touch sensing technologies face challenges in concurrently detecting normal touch and force touch, requiring separate hardware and increasing costs and power consumption.
Innovation Solution
A method and device utilizing two capacitors with distinct driving signals of different frequencies to generate a composite sensing signal, allowing concurrent detection of normal touch and force touch, reducing hardware requirements and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate hardware is used for normal touch detection and force touch detection, then detection accuracy is improved, but hardware cost and device complexity increase
Solution Approach 1:
The patent combines normal touch detection and force touch detection into a single integrated sensing system. By using one capacitor to sense both touch position and pressure through different capacitance changes, the system merges two separate detection functions into one hardware component, reducing hardware cost while maintaining detection accuracy
Solution Approach 2:
The single capacitor is designed to perform multiple functions: detecting both normal touch (position) and force touch (pressure) simultaneously. By making the capacitor multi-functional, the system eliminates the need for separate hardware components for each detection type, thereby reducing device complexity and cost
2Measurement precision
If separate hardware is used for normal touch detection and force touch detection, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent merges normal touch and force touch detection into a single sensing operation using one capacitor. This consolidation reduces the total power consumption by eliminating redundant hardware components and their associated power requirements, while still providing accurate detection for both touch types
Solution Approach 2:
The single capacitor is designed to perform multiple detection functions simultaneously, reducing the overall power consumption of the system. By making one component multi-functional, the patent eliminates the need for separate power-consuming hardware for normal and force touch detection
3Device complexity
If time division processing is used to detect normal touch and force touch sequentially, then hardware cost is reduced, but detection speed and responsiveness deteriorate
Solution Approach 1:
The patent enables continuous simultaneous detection of both normal touch and force touch through a single capacitor. By measuring different capacitance changes at the same time rather than sequentially, the system maintains continuous detection capability for both touch types, improving detection speed and responsiveness while keeping hardware simple
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous detection of touch position and pressure without time division processing, reducing hardware costs and power consumption by integrating normal and force touch sensing into a single signal.
Implementation Method 1
as an object such as a finger approaches the touch panel, a tiny capacitance can form between the object and the sensing points in close proximity to the object. By detecting changes in capacitance, the sensing circuit can recognize the object and determine the location of the object on the touch panel
Data Source
AI summary
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.