Tiling Display Ground Connection Layout for EMI Noise Reduction
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Solution Overview
Problem
Display devices, particularly tiling display devices, face significant challenges with signal noise due to electromagnetic interference (EMI), which leads to reliability degradation and increased noise levels due to the generation of magnetic fields and electro-magnetic interference (EMI) from signal lines, exacerbated by the presence of multiple signal lines in tiling configurations.
Innovation Solution
The implementation of a display device and tiling display device design that includes a display panel with contact units on its side surfaces and a metal cover on the rear surface, connected via a connection line, allowing for the selective connection of ground structures between multiple display devices to minimize signal noise by varying the shape of the antenna radiating EMI noise and reducing ground potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display devices are connected in a tiling configuration, then the display area is expanded, but signal noise and electromagnetic interference increase
Solution Approach 1:
The patent implements equipotentiality by connecting the metal covers (ground structures) of multiple display devices through contact units on their side surfaces. This creates a common ground potential across all tiled devices, minimizing ground potential differences that cause noise. The connection lines establish equipotential regions that prevent noise generation from potential differences while maintaining the expanded display area.
Solution Approach 2:
The patent converts the harmful effect of electromagnetic interference by using the metal covers as both EMI shields and selectable antenna elements. By selectively connecting ground structures through contact units, the system can vary the effective antenna shape formed by metal covers, turning potential noise sources into controllable elements that can be configured to minimize radiation at specific frequencies.
2Object-affected harmful factors
If ground structures of multiple display devices are connected, then noise is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the ground connection system into modular contact units located on the side surfaces of each display device. Each contact unit can independently connect to adjacent devices, allowing flexible configuration of ground connections. This segmented approach reduces complexity compared to a fully interconnected system, as connections can be made locally and selectively between neighboring devices.
Solution Approach 2:
The metal covers serve multiple functions: they act as EMI shields, heat sinks, and selectable antenna elements. The contact units provide universal connectivity, enabling both ground connection and potential antenna configuration functions. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity while achieving noise reduction.
3Object-affected harmful factors
If metal covers are selectively connected through contact units, then antenna shape can be varied to reduce noise at specific frequencies, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by placing contact units at specific locations on the side surfaces of display devices where they can connect to corresponding contact units of adjacent devices. The metal covers are designed with specific geometries and connection points that create effective antenna shapes when connected. This localized approach to connection design simplifies manufacturing compared to requiring precise alignment across entire surfaces, as only specific contact points need to match.
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 design effectively reduces signal noise across various frequencies by stabilizing the ground structures and minimizing potential differences between display devices, thereby enhancing the reliability and noise reduction capabilities of the display devices.
Implementation Method 1
a metal cover disposed on a rear surface of the display panel and grounded
Implementation Method 2
a connection line disposed between the metal cover and the plurality of contact units
Data Source
AI summary
A display device includes a display panel; a plurality of contact units disposed on side surfaces of the display panel; a metal cover disposed on a rear surface of the display panel and grounded; and a connection line disposed between the metal cover and the plurality of contact units. Accordingly, in the present disclosure, by disposing the plurality of contact units connected to the metal cover on the side surfaces of the display panel, the metal covers of the display devices may be connected to each other when implementing a tiling display device.