Capacitive Touch Panel Water Droplet Detection via Movement Verification
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Solution Overview
Problem
Electrostatic capacitive touch panels struggle to distinguish between a bare hand or gloved finger operations and water droplets, leading to incorrect detection and operational issues due to similar capacitive value variations.
Innovation Solution
An electronic apparatus with an electrostatic capacitive touch panel that determines a two-dimensional coordinate based on an object's conductivity, making it effective when certain conditions are met and ineffective after a predetermined time if the coordinate does not change significantly, preventing false detection of water droplets as operational inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel detects capacitive value variations to identify touch operations, then hover operations and gloved finger operations can be detected, but water droplets are incorrectly detected as operational inputs due to similar capacitive variations
Solution Approach 1:
The patent introduces a time dimension to the detection process by monitoring whether the instructing object moves within a predetermined time period. This temporal criterion distinguishes between water droplets (which remain stationary) and actual user operations (where the finger moves), resolving the ambiguity caused by similar capacitive variations from both water and fingers.
Solution Approach 2:
The system first determines a two-dimensional coordinate based on capacitive variation, then subsequently checks whether the object moves within a predetermined time. This preliminary coordinate determination followed by movement verification allows the system to initially capture all potential inputs and then filter out false positives based on movement behavior.
2Measurement precision
If the touch panel continuously monitors capacitive values to distinguish touch from hover operations, then operation detection accuracy improves, but energy consumption increases due to unnecessary display activation
Solution Approach 1:
The system employs periodic monitoring by checking whether the instructing object moves within a predetermined time period rather than continuous monitoring. This periodic verification maintains detection accuracy while reducing unnecessary processing and display activation, thereby conserving battery energy.
Solution Approach 2:
The system uses the movement behavior of the instructing object itself as the criterion for determining whether to activate the display. The object's own movement pattern serves as the verification mechanism, eliminating the need for separate continuous monitoring systems and reducing energy consumption.
3Productivity
If the touch panel uses threshold-based detection to identify touch operations, then simple and fast detection is achieved, but false positives occur when water droplets are present on the panel
Solution Approach 1:
The system first determines a coordinate based on capacitive variation exceeding the threshold, then subsequently verifies whether the object moves within a predetermined time. This two-stage approach maintains the speed of threshold-based detection while adding a verification step that eliminates false positives from water droplets.
Solution Approach 2:
The system uses feedback from the movement detection to verify the initial threshold-based determination. By checking whether the instructing object moves within the predetermined time, the system confirms whether the initial capacitive variation was caused by a real touch operation or a water droplet, thereby eliminating false positives while maintaining detection speed.
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
This solution effectively differentiates between actual finger operations and water droplets, ensuring accurate input detection and preventing continuous operation errors, thereby extending battery life by avoiding unnecessary display activation.
Implementation Method 1
an electrostatic capacitive touch panel unit through which display of the display unit passes and that determines a two-dimensional coordinate indicated by an instructing object which has some conductivity
Implementation Method 2
a pressure detection unit that detects distortion of the transparent member
Data Source
AI summary
An electronic apparatus includes a display unit that displays predetermined information and an electrostatic capacitive touch panel unit through which display of the display unit passes and that determines a two-dimensional coordinate indicated by an instructing object which has some conductivity. In the electronic apparatus, when a predetermined condition is satisfied, a two-dimensional coordinate corresponding to the instructing object is caused to be effective and the effective two-dimensional coordinate is changed depending on movement of the instructing object, and when the effective two-dimensional coordinate is changed in a predetermined range for a predetermined time, the effective two-dimensional coordinate is caused to be ineffective.