LCD Ground Tab Bent Shape for Stable ESD Shielding
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Solution Overview
Problem
In liquid crystal displays (LCDs), existing electrostatic shielding solutions face instability due to gaps generated under the module assembly, leading to ineffective discharge of electrostatic forces.
Innovation Solution
A ground tab with a bent portion is positioned between the mold frame and the chassis, providing increased contact area by contacting the upper and side surfaces of the mold frame, ensuring stable electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground tab is used for electrostatic shielding, then electrostatic discharge function is provided, but contact instability occurs due to gaps under the module assembly
Solution Approach 1:
The ground tab is designed to contact the mold frame in multiple dimensions - both the upper surface and the side surface. This multi-dimensional contact approach transforms a single-point or single-surface contact into a distributed contact across multiple surfaces, eliminating gaps and ensuring stable electrostatic discharge functionality.
Solution Approach 2:
The ground tab structure is positioned within the mold frame assembly, with the tab extending to contact both upper and side surfaces. This nested configuration ensures that the ground tab is securely held in place by the mold frame structure, preventing contact instability while maintaining the electrostatic shielding function.
2Ease of manufacture
If the ground tab contacts only the upper surface of the mold frame, then installation is simple, but contact area is insufficient for stable electrostatic discharge
Solution Approach 1:
The ground tab extends to contact not only the upper surface but also the side surface of the mold frame. This multi-surface contact design increases the total contact area significantly, providing stable electrostatic discharge functionality while maintaining a relatively simple tab structure that can be easily installed.
Solution Approach 2:
The ground tab is designed with different contact regions - one portion contacting the upper surface and another portion contacting the side surface. This local differentiation of contact areas maximizes the total contact area with the mold frame, ensuring stable electrostatic shielding without requiring a complex overall 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
This configuration effectively stabilizes the discharge of electrostatic forces flowing through the chassis, enhancing the reliability of the electrostatic shielding in LCDs.
Implementation Method 1
a ground tab between the mold frame and the chassis, the ground tab having elasticity and including a bent portion
Data Source
AI summary
A liquid crystal display (LCD) including a display panel having a pixel for displaying an image; a backlight assembly for providing light to the display panel; a mold frame for receiving the backlight assembly; a chassis for supporting the display panel and the mold frame; and a ground tab between the mold frame and the chassis, the ground tab having elasticity and including a bent portion, the bent portion corresponding in shape to a bend in the chassis, and the ground tab overlying an upper surface and a side surface of the mold frame.