Vehicle Display Back Cover Structure for EMI Shielding and Rigidity
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Solution Overview
Problem
Existing vehicle display devices face issues with electromagnetic interference (EMI) noise and require improved rigidity and reduced thickness, especially as they become larger in size.
Innovation Solution
A display device with a back cover made of a conductive and high-strength composite material, featuring first and second protrusions for grounding and structural support, and a conductive member for shielding electromagnetic waves, replacing the traditional fixing bracket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional fixing bracket is used to support the display device, then the structural support is provided, but the rigidity is insufficient and the thickness cannot be reduced
Solution Approach 1:
The back cover is made of a composite material comprising a base material and conductive particles dispersed therein. This composite structure provides both mechanical strength for rigidity and electrical conductivity for EMI shielding, eliminating the need for separate fixing brackets and enabling thickness reduction while maintaining structural support.
Solution Approach 2:
The invention merges multiple functions into the back cover: structural support (replacing the fixing bracket), EMI shielding (replacing separate shielding structures), and grounding (integrating ground contact). This functional integration reduces the overall number of components and enables thickness reduction while maintaining rigidity.
2Reliability
If the display device components are arranged to process signals, then the display function is achieved, but electromagnetic interference (EMI) noise is generated
Solution Approach 1:
The conductive particles in the back cover transform the harmful EMI electromagnetic waves into beneficial grounding paths. The EMI noise that would otherwise interfere with display signals is instead directed to ground through the conductive composite material, converting a harmful effect into a protective mechanism.
Solution Approach 2:
The back cover acts as an intermediary between the signal-processing components and the external environment. It provides EMI shielding by intercepting electromagnetic waves and directing them to ground, protecting the sensitive display components from interference while allowing the display function to operate reliably.
3Length of moving object
If the back cover is made thinner to reduce display device thickness, then the thickness is reduced, but the rigidity and EMI shielding capability are compromised
Solution Approach 1:
The conductive composite material provides enhanced mechanical properties and electrical conductivity within a thin structure. The dispersion of conductive particles in the base material creates a rigid, electrically active composite that maintains both rigidity and EMI shielding capability at reduced thickness.
Solution Approach 2:
The invention changes the material parameters of the back cover by incorporating conductive particles with specific electrical properties and mechanical characteristics. This parameter modification enables the back cover to achieve both rigidity and EMI shielding functionality at a thinner profile compared to traditional materials.
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 noise and enhances rigidity while minimizing thickness compared to conventional designs.
Implementation Method 1
a back cover covering the fixing plate and the printed circuit board and made of a conductive material... may reduce EMI noise caused by electromagnetic waves emitted between electronic components mounted on a printed circuit board via the back cover made of the conductive material
Implementation Method 2
The first protrusion may provide a ground voltage of the printed circuit board to the back cover
Data Source
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AI summary
Disclosed is a display device mounted in a vehicle including a display panel, a fixing plate surrounding side surfaces and a rear surface of the display panel and having an opening defined therein, a printed circuit board connected to the display panel and located in the opening, and a back cover covering the fixing plate and the printed circuit board and made of a conductive material, wherein the back cover includes a first protrusion in contact with the printed circuit board. The display device reduces EMI noise caused by electromagnetic waves emitted between electronic components mounted on the printed circuit board via the back cover made of the conductive material.