Insulation Tape Grooves Block ESD Through Fastening Bolts
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Solution Overview
Problem
Display devices are susceptible to damage from electrostatic discharge (ESD) during operation, which can lead to breakdown and degradation of electronic elements and reduced display quality due to electromagnetic interference (EMI).
Innovation Solution
The implementation of a display device configuration that includes a shield chassis connected to a bottom chassis via an insulation tape with grooves, where a bolt is used to couple the shield chassis to the bottom chassis, ensuring electrical insulation and preventing ESD transmission through the bolt by separating the bolt area into portions at the grooves, and optionally using a washer around the bolt for additional insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bolt is used to couple the shield chassis to the bottom chassis, then the mechanical strength and structural stability are improved, but the electrostatic discharge (ESD) can be transmitted through the conductive bolt causing damage to electronic elements
Solution Approach 1:
An insulation tape is introduced as an intermediary material between the shield chassis and bottom chassis at the bolt coupling location. The insulation tape wraps around the bolt and between the chassis components, serving as a mediator that maintains the mechanical connection while blocking ESD transmission path through the bolt assembly.
Solution Approach 2:
The bolt area is segmented into multiple portions by grooves created by the bolt's presence in the insulation tape. This segmentation divides the continuous conductive path into isolated sections, preventing ESD from traveling along the bolt surface by creating electrical insulation barriers at each groove boundary.
2Adaptability or versatility
If the display device is electrically coupled to external electronic devices, then the functionality and adaptability are improved, but electromagnetic interference (EMI) causing noise in the image is generated
Solution Approach 1:
The shield chassis is designed to convert harmful EMI and ESD into a controlled grounding path. By providing a dedicated shielded connection point that can be coupled to external devices, the design transforms potential harmful electromagnetic interactions into a protected communication interface, where interference is contained and directed away from sensitive display electronics.
3Device complexity
If the shield chassis is directly coupled to the bottom chassis, then the device complexity is reduced, but the reliability against ESD damage is worsened
Solution Approach 1:
An insulation tape (thin film) is applied to the bolt and chassis surfaces at the coupling interface. This thin film provides effective ESD protection without adding significant structural complexity, maintaining the simplicity of the direct coupling design while introducing the necessary electrical insulation property.
Data Source
AI summary
A display device including a display panel, a backlight assembly to provide light to the display panel, a bottom chassis to accommodate the backlight assembly, a shield chassis connected to the bottom chassis, an insulation tape disposed between the shield chassis and the bottom chassis, the insulation tape including a bolt having grooves defined therein, and a bolt extending through the bolt area and coupling the shield chassis to the bottom chassis. The bolt area is separated into portions at the grooves by the bolt, such that the portions of the bolt area electrically insulate the bolt from the bottom chassis.