Touchpad Segmentation for ESD Protection in Notebook PCs
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Solution Overview
Problem
Notebook PCs are prone to electro-static discharge (ESD) damage and user injury due to static electricity being conducted through metallic touch pads, which can cause damage to internal components and pose a risk to the user.
Innovation Solution
The design incorporates a first and second portion with conductive and nonconductive regions, where the nonconductive regions are laser-etched and strategically positioned to restrict current flow to electronic components and direct static current to a ground terminal, preventing damage and injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the touch pad is plated with metal coating to enhance appearance, then the aesthetic quality is improved, but the risk of electro-static discharge damage and user injury increases
Solution Approach 1:
The touch pad surface is segmented into multiple conductive regions and nonconductive regions. The nonconductive regions (laser-etched areas) are strategically positioned to interrupt the continuous conductive path, thereby preventing electro-static discharge from reaching internal components while maintaining metallic plating on other areas for aesthetic purposes.
Solution Approach 2:
Different regions of the touch pad are assigned different electrical properties: some areas retain metal coating for appearance, while specific regions are laser-etched to create nonconductive zones for ESD protection. This local differentiation allows simultaneous achievement of aesthetic quality and safety.
2Shape
If the touch pad is plated with metal coating to enhance appearance, then the aesthetic quality is improved, but the risk of user injury from electricity leakage increases
Solution Approach 1:
The touch pad surface is segmented into multiple conductive regions and nonconductive regions. The nonconductive regions (laser-etched areas) are strategically positioned to interrupt the continuous conductive path, thereby preventing electro-static discharge from reaching internal components while maintaining metallic plating on other areas for aesthetic purposes.
Solution Approach 2:
The nonconductive regions act as intermediary barriers between the conductive metal coating and the user's fingers. These laser-etched zones interrupt the electrical path, serving as a protective mediator that prevents direct contact between leakage current and the user while preserving the overall metallic appearance.
3Reliability
If nonconductive regions are added to the touch pad to prevent ESD damage, then the safety is improved, but the device complexity increases
Solution Approach 1:
Instead of adding separate protective components or layers, the solution extracts or removes material from specific areas of the metal coating through laser etching to create nonconductive regions. This subtractive approach integrates the safety function directly into the existing structure without adding external complexity.
Solution Approach 2:
The patent replaces complex mechanical or structural ESD protection systems with a simpler optical/thermal process (laser etching) that modifies the surface properties of existing material. This substitution achieves the same protective function with reduced device complexity.
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 reduces the risk of ESD damage to electronic components and user injury by isolating leakage currents and directing static electricity to a safe path, maintaining the device's functionality and user safety.
Implementation Method 1
the second nonconductive region and the fourth nonconductive region are comprised of a laser-etched region
Data Source
AI summary
An electronic device including a first portion, a second portion, and a circuit board is provided. The first portion has a first surface including a first conductive region. The second portion has a second surface including a second conductive region and a second nonconductive region. The second conductive region and the second nonconductive region are respectively in contact with a part of the first conductive region. The circuit board has a plurality of electronic components thereon, and the circuit board is disposed at one side of the first portion and the second portion.