Integrated Line Filter Structure for Slim Display EMI Control
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Solution Overview
Problem
Existing display devices face challenges in effectively managing electromagnetic interference (EMI) and electromagnetic wave emissions, which can affect nearby devices and human health, while requiring a simple and cost-effective installation of noise filters.
Innovation Solution
A line filter structure comprising a case, magnetic core, core cover, and separator, which is connectable to a printed circuit board, with coils wound around the case and core cover, and a separator to isolate coil regions, ensuring electrical connection and noise removal, while allowing for a slim design and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional line filter structure is used, then EMI filtering function is achieved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines multiple components (case, core cover, separator, and mounting structure) into an integrated line filter assembly. The case and core cover form a unified housing structure that accommodates the magnetic core and coils, while the separator integrates both isolation and mounting functions. This merging eliminates the need for separate mounting brackets and isolation structures, thereby reducing device complexity while maintaining EMI filtering effectiveness.
Solution Approach 2:
The case and core cover serve multiple functions: they provide structural housing, electromagnetic shielding, mechanical support for coils, and integration interfaces for the separator. The separator simultaneously isolates electromagnetic fields and provides mounting attachment points. This multi-functionality reduces the total component count and simplifies the overall structure while achieving effective EMI filtering.
2Object-affected harmful factors
If additional structures are added to the line filter, then EMI shielding is improved, but the thickness and installation complexity increase
Solution Approach 1:
The magnetic core is nested within the case, which is then covered by the core cover. The separator is nested within the hollow portions of both the case and core cover. The coils are wound around the external surface of the case and core cover assembly. This nested arrangement maximizes EMI shielding effectiveness within a compact thickness by utilizing internal spaces efficiently without requiring additional external structures.
3Ease of manufacture
If a simple line filter structure is used, then production cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The case and core cover are pre-formed with integrated hollow portions and guide ribs that define precise alignment features. The separator is pre-shaped with protrusions that fit into these guide features. This preliminary preparation of alignment features during molding or forming operations ensures accurate component alignment during assembly without requiring complex precision machining or adjustment processes, thereby reducing production costs while maintaining manufacturing precision.
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 solution effectively reduces EMI and electromagnetic wave emissions, enhances production efficiency, and achieves a slim design by minimizing additional structures and materials, thereby lowering production costs and improving manufacturing efficiency.
Implementation Method 1
a coil wound around an outside of the case and the core cover
Implementation Method 2
a magnetic core to be accommodated in the case
Data Source
AI summary
A display device including a display panel which comprises: a power supply board comprising a line filter. The line filter, to remove noise, comprising: a case connectable to a printed circuit board to thereby electrically connect the line filter to the printed circuit board; a magnetic core to be accommodated in the case; a core cover coupleable to the case to cover the magnetic core; a coil wound around an outside of the case and the core cover; and a separator coupleable to the case and the core cover. The separator comprises: a base; an isolating portion protruding from the base to be insertable into the case and the core cover so as to isolate a region in which the coil is wound; and a stepped portion protruding from the base and in contact with one surface of the case to separate the base from the printed circuit board.