Flexible Touch Panel Sensing Loop Calibration
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Solution Overview
Problem
Flexible touch panels experience variations in electrical characteristics due to bending stress and temperature changes, leading to mis-sensing and reduced accuracy in touch sensing mechanisms.
Innovation Solution
A touch sensing method that defines at least one sensing loop as a reference sensing loop, providing a driving signal to read reference and sensing signals to detect touch positions, compensating for electrical variations caused by bending stress and temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is made flexible to enable folding and bending, then the portability and storage convenience are improved, but the electrical characteristics of sensing elements vary due to stress and temperature changes
Solution Approach 1:
The patent applies preliminary action by performing electrical detection to obtain reference signals before actual touch sensing. This allows the system to pre-capture the baseline electrical characteristics of sensing loops under current environmental conditions (stress, temperature), which are then used to compensate for variations during touch sensing operations.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting sensing parameters based on detected reference signals. The system modifies sensing thresholds, compensation values, or detection parameters according to the electrical characteristics measured during electrical detection, thereby adapting to changes caused by flexible substrate deformation.
2Measurement precision
If the sensing elements are made sensitive to detect subtle touches, then the touch sensing sensitivity is improved, but the accuracy decreases due to mis-sensing caused by electrical characteristic variations
Solution Approach 1:
The patent implements feedback by using reference signals obtained from electrical detection to adjust and compensate sensing results during touch sensing. The system continuously monitors electrical characteristics through reference signal acquisition and uses this feedback information to correct sensing accuracy, eliminating mis-sensing caused by environmental variations.
Solution Approach 2:
The patent applies preliminary action by performing electrical detection to obtain reference signals before actual touch sensing. This allows the system to pre-capture the baseline electrical characteristics of sensing loops under current environmental conditions (stress, temperature), which are then used to compensate for variations during touch sensing operations.
3Measurement precision
If reference signals are read during electrical detection period and sensing signals are read during touch sensing period, then the touch sensing accuracy is improved through calibration, but the system complexity increases
Solution Approach 1:
The patent applies merging by combining the electrical detection function and touch sensing function into a single integrated system. The same sensing loops serve dual purposes: they function as reference sensing loops during electrical detection and as touch sensing loops during touch sensing. This reduces the need for separate hardware components while maintaining calibration accuracy.
Solution Approach 2:
The patent implements universality by designing sensing loops that serve multiple functions. The same sensing loops are used both for electrical detection (to obtain reference signals) and for actual touch sensing operations. This multi-functional design reduces system complexity while enabling accurate calibration and compensation.
Data Source
AI summary
A touch sensing method of a touch panel may include: defining at least one of at least one sensing loop as at least one reference sensing loop, wherein the sensing loop is disposed in the touch panel for sensing a touch event; providing a driving signal to the reference sensing loop in order to read at least one reference signal from the reference loop during an electrical detection period; providing the driving signal to the sensing loop in order to read at least one sensing signal from the sensing loop during a touch sensing period; and detecting a touch position of the touch event according to the reference signal and the sensing signal. Several touch apparatuses are also provided.