Integrated EMI Absorber for LCD Noise Reduction
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Solution Overview
Problem
Conventional EMI absorbers are not effective in reducing noise in liquid crystal display (LCD) devices with limited ground regions, as they require separate attachment and increase manufacturing processes and costs, and are not suitable for broadly spaced targets.
Innovation Solution
An EMI absorber comprising a conductive sheet with first and second portions, where the first portion absorbs EMI from a ground portion of a data-side PCB and the second portion conducts EMI to an outer surface of an LCD device's accommodation member, integrated with an elastic member and support for efficient noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional EMI absorber is used to reduce noise in LCD devices with limited ground regions, then noise reduction is achieved, but the EMI absorber must be separately attached which increases manufacturing processes and costs
Solution Approach 1:
The patent combines the EMI absorber and conductive sheet into a single integrated component. The EMI absorber includes a first conductive sheet for absorbing EMI and a second conductive sheet for providing electrical contact, merged into one structure that can be attached as a single unit to the LCD device, thereby reducing manufacturing complexity while maintaining noise reduction effectiveness
Solution Approach 2:
The integrated EMI absorber serves multiple functions simultaneously: it absorbs electromagnetic interference, provides electrical ground contact, and can be universally applied to both narrowly spaced and broadly spaced ground portions. This multi-functionality eliminates the need for separate EMI absorber and conductive sheet attachments
2Object-affected harmful factors
If a conventional EMI absorber is used for broadly spaced ground portions, then it is not suitable for providing effective electric contacts
Solution Approach 1:
The patent extends the conductive sheet component in the integrated EMI absorber to bridge broadly spaced ground portions. By increasing the dimensional extent of the conductive path in the second conductive sheet, the absorber can effectively provide electrical contact between ground portions that are narrowly spaced, broadly spaced, or even distant from each other
3Object-affected harmful factors
If both EMI absorber and conductive sheet are used separately, then comprehensive EMI protection is achieved, but manufacturing costs increase
Solution Approach 1:
The patent merges the EMI absorber and conductive sheet into a single integrated component with multiple conductive sheets working together. This unified structure provides comprehensive EMI protection while reducing manufacturing costs by eliminating the need to purchase, handle, and attach separate EMI absorber and conductive sheet components
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 EMI absorber effectively reduces noise by up to 8 dB in the frequency band of 68 MHz to 300 MHz, allowing for a reduced number of PCB layers and smaller device size, while being cost-effective and suitable for both thin and broadly spaced ground regions.
Implementation Method 1
an elastic member covered by the first portion
Implementation Method 2
the second portion for conducting EMI to an EMI discharge target
Data Source
AI summary
An electromagnetic interference (EMI) absorber includes an EMI conductive sheet having first and second portions, the first portion absorbing EMI from an EMI absorption target and the second portion for conducting EMI to an EMI discharge target, and an elastic member covered by the first portion.