Conductive Housing Grounding Layout for Display EMI Suppression
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Solution Overview
Problem
Existing tuner devices face challenges in reducing unnecessary radiation due to the limitations in sizing the metal housing dimensions, which exceed the half wavelength of the highest oscillation frequency, leading to high impedance and increased electromagnetic interference.
Innovation Solution
The solution involves strategically placing grounding sites on the conductive housing to lower impedance at high impedance areas, using a second grounding site positioned at specific intervals relative to the first grounding sites to reduce unnecessary radiation, even when housing dimensions exceed the half wavelength of the highest oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the housing dimensions are reduced to be no more than half the wavelength of the highest oscillation frequency, then unnecessary radiation is reduced, but the housing cannot accommodate the required capacitors and inductors
Solution Approach 1:
The patent changes the grounding parameters by strategically positioning grounding sites at specific intervals (no more than one-fourth the wavelength) along the housing surface. This parameter change allows the housing to maintain larger dimensions while still effectively suppressing electromagnetic radiation through optimized grounding distribution rather than relying solely on size reduction.
2Object-generated harmful factors
If grounding posts are disposed evenly along the ends or interior of the housing, then unnecessary radiation is reduced, but the configuration becomes more complicated and cost increases
Solution Approach 1:
The patent applies local quality by positioning grounding sites at specific strategic locations rather than distributing them uniformly. The grounding sites are placed at intervals of no more than one-fourth the wavelength at positions that are most effective for suppressing radiation, creating non-uniform but optimized grounding distribution that reduces complexity while maintaining effectiveness.
3Object-generated harmful factors
If the housing diagonal size is set to no more than half the wavelength, then radiation is reduced, but resonance occurs at other diagonal paths producing large radiation
Solution Approach 1:
The patent segments the housing surface into multiple grounding zones by placing multiple grounding sites at strategically determined intervals. This segmentation approach divides the housing into smaller effective grounding sections, each contributing to radiation suppression, thereby preventing resonance along any single diagonal path while maintaining overall shielding reliability.
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 configuration effectively reduces unnecessary radiation by lowering impedance across the housing, simplifying the design and reducing costs, while maintaining effective shielding against electromagnetic interference.
Implementation Method 1
reducing unnecessary radiation (EMI: electromagnetic interference) from a metal housing of the tuner device
Implementation Method 2
a range or site occurs in which the impedance is high in the metal housing, and a large amount of unnecessary radiation is produced from this range or site
Data Source
AI summary
A display device includes a signal processor, a display component, a substrate, and a conductive housing. The signal processor includes an oscillator that outputs oscillation signal. The signal processor processes signal whose frequency is higher than a specific threshold. The display component displays video. The substrate has a ground component. The signal processor is disposed on the substrate. The conductive housing is connected to a first site of the ground component and to a second site that is different from the first site. The first site and the second site are disposed at positions where a first area of the housing in which an impedance is higher than a first threshold due to the first site overlap at least part of a second area of the housing in which an impedance is lower than a second threshold due to the second site.