Touch Module Electrode Segmentation for Higher Mutual Capacitance
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Solution Overview
Problem
Existing touch display technologies suffer from low touch sensitivity due to limited coupling areas between touch electrodes, resulting in weak charge stealing phenomena when fingers touch interior patterns.
Innovation Solution
The design includes touch electrodes with electrode blocks arranged in specific sequences and connected in series, featuring internal patterns and bridges to increase coupling areas and reduce channel impedance, enhancing touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch electrode designs are used, then the device structure is simple, but the coupling area between touch electrodes is limited resulting in low touch sensitivity
Solution Approach 1:
The touch electrodes are divided into multiple electrode blocks arranged in specific patterns (first electrode blocks, second electrode blocks, third electrode blocks, fourth electrode blocks). This segmentation increases the coupling area between intersecting electrodes while maintaining manageable complexity through systematic arrangement and connection.
2Measurement precision
If electrode blocks are arranged to increase coupling area, then touch sensitivity improves, but the number of electrodes and connections increases
Solution Approach 1:
Adjacent electrode blocks of the same polarity are connected in series to form continuous conductive paths. This merging reduces the effective number of independent electrodes while maintaining the increased coupling area benefit, as adjacent blocks work together to enhance mutual capacitance detection.
Solution Approach 2:
The electrode blocks serve multiple functions: they form the touch sensing electrodes, provide conductive paths through series connections, and create the necessary coupling areas for mutual capacitance measurement. This multi-functionality reduces the need for additional components.
3Measurement precision
If more electrode blocks are used to enhance charge stealing phenomenon, then touch detection capability improves, but channel impedance increases
Solution Approach 1:
Adjacent electrode blocks of the same polarity are connected in series to form continuous conductive paths. This continuity maintains low channel impedance by providing unbroken electrical pathways, allowing the increased number of electrode blocks to enhance charge stealing detection without proportionally increasing impedance.
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
Significantly increases the amount of change in mutual capacitance value between touch electrodes, improving touch sensitivity and drive performance.
Implementation Method 1
Touch is detected and located by sensing a change in sensor channel capacitance corresponding to a finger touch area by charge and discharge scanning the touch sensor channel capacitance
Data Source
AI summary
The disclosure provides a touch module, a touch display panel and a display device. Each touch electrode includes a plurality of electrode blocks arranged along an extending direction, and electrode blocks belonging to other touch electrodes are distributed in an area where at least part of all the electrode blocks are located, which makes full use of an interior area of a traditional touch pattern and increases a coupling area between the touch electrodes. When touch occurs, an amount of change in a mutual capacitance value between the touch electrodes will be significantly increased, thereby increasing touch sensitivity.