Conductive Display Housing Layout for EMI Leakage Containment
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Solution Overview
Problem
Existing display devices face challenges in preventing leakage of electromagnetic noise due to structural and manufacturing restrictions, which can interfere with other electronic devices in vehicles.
Innovation Solution
A display device design featuring a conductive housing connected to ground, a conductive frame sandwiching optical members with a separation from control circuits, and a conductive elastic body in contact with the frame, generating capacitance to attract and prevent electromagnetic noise from leaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield member is provided to prevent electromagnetic noise leakage, then electromagnetic interference is reduced, but device complexity and manufacturing difficulty increase due to structural and process restrictions
Solution Approach 1:
The patent extracts the electromagnetic shielding function from a separate shield member and integrates it into the housing structure itself. The housing is designed with a conductive material and grounded to serve as the shield, eliminating the need for additional shield components while maintaining electromagnetic interference protection
Solution Approach 2:
The housing serves multiple functions: it provides mechanical support, structural containment, and electromagnetic shielding. By making the housing conductive and grounding it, the same component that provides structural integrity also performs the shielding function, reducing overall device complexity
2Object-affected harmful factors
If a shield member is provided to prevent electromagnetic noise leakage, then electromagnetic interference is reduced, but manufacturing process complexity increases
Solution Approach 1:
The shielding function is extracted from a separate manufacturable component and integrated into the housing, which can be manufactured as a single piece or pre-integrated into the housing structure, simplifying the overall manufacturing process by reducing the number of separate components to be assembled
Solution Approach 2:
The housing and shielding structure are merged into a single integrated component. The housing is designed to be conductive and is directly grounded, combining the structural and shielding functions into one element that can be manufactured and assembled more efficiently
3Object-affected harmful factors
If the frame and control circuit are separated, then electromagnetic noise leakage is prevented, but device complexity increases
Solution Approach 1:
The control circuit is extracted from direct contact with the conductive frame and is positioned at a distance, with its grounding path separated from the frame's grounding. This spatial separation prevents noise coupling while the conductive frame continues to provide shielding for other components
Solution Approach 2:
Different regions of the device have different grounding and shielding characteristics. The conductive frame provides shielding in its local region, while the control circuit has its own separate grounding path, creating localized electromagnetic environments that prevent noise leakage without requiring complete redesign of the entire device structure
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
Effectively prevents electromagnetic interference by attracting and containing noise within the device, reducing interference with vehicle electronics.
Implementation Method 1
a conductive elastic body in contact with the frame, generating capacitance to attract and prevent electromagnetic noise from leaking
Data Source
AI summary
The present disclosure is to prevent leakage of electromagnetic noise in a display device. The display device includes: a conductive housing electrically connected to a ground; one or a plurality of optical members accommodated in the housing; a conductive frame sandwiching the optical member with the housing, a part of the frame being in direct or indirect contact with the housing; a liquid crystal portion disposed along a surface of the frame; and a control circuit connected to the liquid crystal portion and configured to control the liquid crystal portion. The frame and the control circuit are separated.