Touchpad Detector Electrostatic Correction Metal Frame
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Solution Overview
Problem
Existing touchpad detectors inaccurately detect user operations due to electrostatic capacity changes caused by metal plating surrounding the operating surface, leading to incorrect coordinate calculations.
Innovation Solution
A detector with a metal frame and electrodes arranged in a coordinate planar direction on the operating surface, which calculates operation positions based on electrostatic capacity changes and corrects these positions by shifting them towards the center of the area with the largest capacity change, ensuring accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal plating is applied to the frame surrounding the touchpad, then the appearance and durability are improved, but the electrostatic capacity changes when a user touches the plated portion, causing incorrect detection of user operations
Solution Approach 1:
The patent extracts the problematic metal plating from the detection area by applying it only to the frame surrounding the touchpad, not to the touchpad surface itself. This separation allows the frame to provide durability while the touchpad surface maintains accurate electrostatic detection.
Solution Approach 2:
The patent introduces a non-conductive layer or coating between the metal frame and the user's finger during touching operations. This intermediary prevents direct electrostatic interaction between the user's body and the metal plating, eliminating the interference that causes detection errors.
2Stability of the object's composition
If the operating surface is surrounded by metal frame with plating, then the structural integrity and aesthetics are improved, but the electrostatic interference from the plating causes incorrect coordinate calculation
Solution Approach 1:
The patent segments the device into distinct functional zones: the metal-framed portion for structural support and aesthetics, and the plating-free touchpad surface for accurate electrostatic detection. This segmentation allows each zone to optimize its specific function without interfering with the other.
Solution Approach 2:
The patent applies different material properties to different locations: metal plating is applied locally to the frame where structural integrity and aesthetics are needed, while the touchpad surface maintains a non-conductive quality locally to ensure accurate electrostatic capacity detection.
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 enhances the accuracy of user operation detection by correcting for the influence of the metal frame, allowing precise determination of the operation position despite the electrostatic interference from the plating.
Implementation Method 1
electrodes detecting a user operation that is an approach or contact of a body of a user toward or with the operating surface
Implementation Method 2
the electrostatic capacity of an electrode may be changed by metal in the plated portion
Data Source
AI summary
A detector includes a frame that is at least partially formed from metal, electrodes arranged in a coordinate planar direction of an operating surface, the operating surface being at least partially in contact with the frame, the electrodes detecting a user operation that is an approach or contact of a body of a user toward or with the operating surface, and a calculator that obtains a calculation coordinate by calculating an operation position of the user operation on the operating surface based on an electrostatic capacity change in each of the electrodes. The operating surface is divided into areas. The calculator converts the calculation coordinate to a correction coordinate shifted from a boundary of one of the areas toward an inner portion of one of the electrodes in which the electrostatic capacity change is larger than other electrodes, thereby determining that the correction coordinate is the operation position.