Self-Capacitance Touch Detection Device with Periodic Electrode Selection
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Solution Overview
Problem
Self-capacitance touch detection devices face reduced detection sensitivity due to increased capacitive coupling between electrodes when drive signals of different phases are supplied, leading to lower detection performance.
Innovation Solution
A detection device with a selection driver that alternately selects and outputs integrated signals from first and second detection electrodes using distinct selection signals during different periods, minimizing capacitive coupling and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If drive signals of different phases are supplied to a plurality of detection electrodes simultaneously, then detection coverage is improved, but capacitive coupling between electrodes increases and detection sensitivity is lowered
Solution Approach 1:
The patent applies periodic action by dividing the detection process into multiple periods, where in each period only one detection electrode is selected and driven with a drive signal. The selection driver sequentially selects different electrodes in different periods, avoiding simultaneous multi-electrode driving. This periodic, sequential approach maintains detection coverage while eliminating capacitive coupling issues that arise from simultaneous multi-electrode operation.
Solution Approach 2:
The patent segments the detection process by dividing it into multiple time periods, with each period dedicated to detecting a specific detection electrode. The selection driver segments the electrode group into individually processed units, selecting one electrode at a time rather than processing multiple electrodes simultaneously. This segmentation eliminates interference between electrodes while maintaining comprehensive detection capability.
2Productivity
If multiple detection electrodes are selected simultaneously for code division selection driving, then detection efficiency is improved, but capacitive coupling increases and sensitivity is reduced
Solution Approach 1:
The patent uses periodic action to sequentially select and detect different electrodes in different periods. The selection driver operates in a systematic sequence where each electrode receives dedicated detection time slots. This approach maintains detection efficiency through structured sequential processing while avoiding the capacitive coupling that results from simultaneous multi-electrode operation.
Solution Approach 2:
The patent ensures continuity of useful action by systematically cycling through all detection electrodes in a predetermined sequence across multiple periods. Rather than leaving electrodes idle or processing them randomly, the selection driver continuously progresses through the electrode group, ensuring each electrode is detected without unnecessary delays. This continuous sequential operation maintains efficiency while preserving sensitivity.
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
The solution effectively suppresses capacitive coupling, thereby improving detection sensitivity and accuracy in self-capacitance touch detection systems.
Implementation Method 1
in the self-capacitance scheme in which detection of an external proximity object is performed based on capacitance of a detection electrode
Data Source
AI summary
Provided is a detection device including at least one first electrode group that includes a plurality of first electrodes. The first electrode outputs a detection signal. A selection driver is configured to perform a first driving during a first period and a second driving during a second period, which is different from the first period.