PCB Wiring Segmentation for Display Noise Isolation
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Solution Overview
Problem
In display devices, electromagnetic noise from metallic covers can cause electrical charging and current flow through ground patterns on printed circuit boards, leading to potential circuit malfunctions and operation defects.
Innovation Solution
A display device and printed circuit board design featuring a wiring pattern with a terminal, circuit, and housing wiring patterns that are electrically coupled only at a branch point, preventing noise current from reaching the circuit and ensuring single-point grounding to prevent malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground pattern is used to provide ground potential to the circuit, then the circuit can operate with stable reference potential, but noise current from the metallic cover can flow through the ground pattern causing circuit malfunction
Solution Approach 1:
The ground pattern is segmented into two separate wiring patterns: a first wiring pattern that provides ground potential to the circuit, and a second wiring pattern that contacts the metallic cover. These two patterns are electrically isolated from each other, preventing noise current from the cover from flowing into the circuit's ground path, thus maintaining circuit stability while eliminating noise interference.
2Strength
If the metallic cover contacts the ground pattern for attachment, then the cover can be securely mounted, but the cover can become electrically charged by electromagnetic waves and discharge current to the circuit
Solution Approach 1:
The ground pattern is divided into separate first and second wiring patterns. The second wiring pattern is specifically designed to contact both the metallic cover and the first wiring pattern only at a single predetermined position. This segmentation allows secure mechanical attachment while controlling electrical contact to a single point, preventing widespread noise current flow.
Solution Approach 2:
The first wiring pattern acts as an intermediary between the second wiring pattern (contacting the cover) and the circuit. Noise current from the cover flows through the second wiring pattern to the first wiring pattern, and the single-point connection ensures this current is directed to ground without interfering with the circuit's ground reference, thus mediating the harmful electrical charge.
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 design effectively prevents noise current from flowing to the circuit, thereby preventing operation defects and ensuring reliable device operation by isolating the housing wiring pattern from the circuit wiring pattern at all points except the branch point.
Implementation Method 1
a wiring pattern electrically coupling the ground potential supply terminal and the circuit
Implementation Method 2
a housing wiring pattern branched from the branch part of the terminal wiring pattern and electrically coupled with the coupling place
Data Source
AI summary
A display device includes a display panel, a printed circuit board attached to the display panel and including a ground potential supply terminal, a circuit, and a wiring pattern electrically coupling the ground potential supply terminal and the circuit, and a housing that contacts a coupling place provided to the wiring pattern and is attached to the printed circuit board through the coupling place. The wiring pattern includes a terminal wiring pattern electrically coupled with the ground potential supply terminal, a circuit wiring pattern branched from a branch part at a predetermined position on the terminal wiring pattern and electrically coupled with the circuit, and a housing wiring pattern branched from the branch part of the terminal wiring pattern and electrically coupled with the coupling place, and the circuit wiring pattern and the housing wiring pattern are uncoupled with each other at any place other than the branch part.