Display Housing Grounding Layout for EMI Radiation Suppression
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Solution Overview
Problem
Conventional techniques for reducing electromagnetic interference (EMI) in tuner devices face challenges due to the limitations in sizing the metal housing, leading to high impedance areas and excessive unnecessary radiation, especially when the housing dimensions exceed half the wavelength of the highest oscillation frequency.
Innovation Solution
The solution involves strategically placing grounding sites on the housing to create overlapping areas that are odd-numbered multiples of ¼ wavelength away from each other, effectively lowering impedance and reducing radiation by using these sites as reference points for impedance reduction.
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 components or meet practical size requirements
Solution Approach 1:
The patent applies local quality by creating specific grounding sites at strategically positioned locations on the housing surface, rather than uniformly treating the entire housing. These localized grounding points (at odd-numbered multiples of 1/4 wavelength from reference points) create local impedance reduction zones that effectively suppress radiation without requiring the entire housing to be minimized in size.
2Object-generated harmful factors
If grounding posts are disposed evenly throughout the housing interior and along ends, then electromagnetic interference is reduced, but the configuration becomes more complicated and cost increases
Solution Approach 1:
The patent extracts the essential grounding function from the conventional approach of multiple evenly-distributed grounding posts throughout the housing. Instead, it identifies and implements only the critical grounding sites located at specific positions (odd-numbered multiples of 1/4 wavelength from reference points), removing unnecessary grounding elements while maintaining EMI reduction effectiveness.
Solution Approach 2:
Rather than distributing grounding posts uniformly throughout the housing as in conventional designs, the patent inverts the approach by concentrating grounding sites at specific critical locations determined by wavelength multiples. This inverted strategy achieves better EMI suppression with fewer grounding elements.
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 reliably reduces unnecessary radiation across the housing, even when dimensions exceed the half-wavelength limit, simplifying the design and reducing costs by minimizing the number of grounding sites required.
Implementation Method 1
strategically placing grounding sites on the housing to create overlapping areas that are odd-numbered multiples of ¼ wavelength away from each other, effectively lowering impedance and reducing radiation
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 processing signal whose frequency is higher than a specific threshold. The display component displays video. The substrate has a ground component, the signal processor being 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 that is an odd-numbered multiple of ¼ wavelength of the oscillation signal away from the first site overlaps at least part of a second area of the housing that is a multiple of ¼ wavelength of the oscillation signal away from the second site.