Digital Display Panel Module Sealing and EMI Control
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Solution Overview
Problem
Digital display panels with sealed modules face challenges due to complex and expensive sealed connectors that cause electromagnetic interference and are difficult to handle and maintain, especially when dealing with high current levels and harmonic components.
Innovation Solution
A sealed module design featuring a power supply box with a DC voltage connector incorporating a ferrite to limit electromagnetic interference, using a water-permeable connector and a chassis with a receptacle to ensure easy assembly and disassembly, and a single conductor connection with a ferrite around the DC voltage connector to reduce electromagnetic disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealed connectors are used to ensure module sealing, then sealing reliability is improved, but connector complexity and cost increase
Solution Approach 1:
The connector system is divided into separate components: a water-permeable connector for data signals and a DC voltage connector for power supply. This segmentation allows each connector to be optimized independently, reducing overall complexity while maintaining sealing reliability through the water-permeable connector's IP68 rating.
Solution Approach 2:
A ferrite block is introduced as an intermediary component around the DC voltage connector wires. This ferrite block serves as a mediator that provides both electromagnetic interference filtering and structural support for sealing, reducing the need for complex multi-component sealed connector assemblies.
2Reliability
If sealed connectors with multiple sealing rings are used, then sealing reliability is improved, but ease of maintenance deteriorates
Solution Approach 1:
The connector system is divided into serviceable and non-serviceable parts. The water-permeable connector is designed to be replaceable by maintenance personnel, while the DC voltage connector with ferrite block remains fixed. This segmentation allows maintenance without requiring disassembly of multiple sealing rings.
Solution Approach 2:
The water-permeable connector is designed with a simple plug-and-play interface that allows maintenance personnel to replace it without special tools or expertise. The connector's IP68 sealing ensures that simple replacement maintains sealing reliability, enabling self-service maintenance.
3Object-affected harmful factors
If ferrite block is added to reduce electromagnetic interference, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The ferrite block combines multiple functions into a single component: electromagnetic interference filtering, structural support for the DC voltage connector, and assistance in maintaining the sealed environment. This merging reduces overall device complexity compared to using separate components for each function.
Solution Approach 2:
The ferrite block serves multiple purposes: it filters electromagnetic interference from high current wires, provides mechanical support for the DC voltage connector assembly, and helps maintain the sealed environment by filling gaps. This multi-functionality reduces the need for additional components.
4Object-affected harmful factors
If flexible conductors with welds are used for ferrite block connection, then electromagnetic interference is reduced, but reliability deteriorates due to weak connection points
Solution Approach 1:
Instead of using complex flexible conductors with welds, the patent uses a rigid DC voltage connector that copies the essential function of flexible conductors (providing electrical connection) but with superior mechanical properties. The connector's rigid structure eliminates weak connection points while maintaining electromagnetic interference filtering through the ferrite block.
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 provides a sealed module with reduced electromagnetic interference, easier maintenance, and simplified handling by using a ferrite-integrated power supply unit within a sealed environment, ensuring effective sealing and efficient heat dissipation while allowing quick replacement of power units.
Implementation Method 1
some of the sealed connectors cause electromagnetic interference because the wires in these connectors are fed through relatively high current levels of up to tens of Amps, and because the module is supplied with low voltage with significant harmonic components. To overcome this problem of electromagnetic interference, it has already been proposed to use flexible connectors, on which a ferrite block is mounted, forming an inductance on the power circuit, intended to attenuate high frequency currents.
Implementation Method 2
a seal is inserted in a groove, in particular an O-ring seal inserted in a groove formed at the top end of the receptacle
Implementation Method 3
a ferrite block is mounted, forming an inductance on the power circuit, intended to attenuate high frequency currents
Data Source
AI summary
A module for a digital display panel includes a circuit board, a first face of which presents a network of light emitting diodes. The module also includes a chassis fixed on a second face of the circuit board, and a water permeable connector mounted on the circuit board. The chassis includes a base around the water permeable connector, a top part of the base having at least one groove, wherein a seal is inserted. Further, the module includes a power supply unit fitted with a continuous voltage connector surrounded by a ferrite and fitted in the water permeable connector. The power supply unit is attached to the chassis so that a lower plate of the power supply unit co-operates with the seal of the base to ensure a seal around the water permeable connector and the DC voltage connector of the power supply unit.