Shared Zener Diode Circuit for LED Backlight ESD Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RGB LED chips in backlighting systems face damage from static electricity, especially when mounted on flexible printed circuit boards, due to space constraints and increased risk of electrostatic discharge, which degrades yield and complicates fabrication.
Innovation Solution
An electrostatic preventing circuit with zener diodes is installed on the flexible printed circuit board, connecting RGB LED chips to a common terminal to moderate static electricity, protecting them from damage without requiring individual circuits for each RGB package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual electrostatic preventing circuits are installed in each RGB package, then protection from static electricity is improved, but device complexity and fabrication difficulty increase due to space constraints
Solution Approach 1:
The patent merges the electrostatic preventing circuits into a single shared circuit on the FPCB that protects all RGB LED chips collectively. Instead of having separate zener diodes in each RGB package, one electrostatic preventing circuit is designed to cover multiple RGB LED chips, reducing the total number of components and simplifying the overall device structure while maintaining protection functionality.
Solution Approach 2:
The electrostatic preventing circuit is designed with universal functionality to protect multiple RGB LED chips simultaneously. The single circuit serves as a multi-functional protection mechanism that can handle electrostatic discharge for several LED chips through shared zener diodes and common connection paths, eliminating the need for dedicated protection circuits for each individual chip.
2Ease of manufacture
If one electrostatic preventing circuit is provided for multiple RGB assemblies, then ease of manufacture is improved, but protection effectiveness may be compromised
Solution Approach 1:
The patent introduces a common terminal as an intermediary element that connects multiple RGB LED chips to the shared electrostatic preventing circuit. This common terminal acts as a mediator that allows the single protection circuit to effectively reach and protect multiple LED chips, ensuring that electrostatic discharge protection is maintained across all connected components without requiring individual circuits for each chip.
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 solution effectively protects RGB LED chips from static electricity, maintaining their functionality and improving yield by allowing for compact packaging without separate electrostatic preventing circuits, thus enhancing the reliability of backlighting systems for various devices.
Implementation Method 1
one LED chip 11 is installed on LED package 10 to mute static electricity introduced into the LED chip 11 by a zener diode 12
Data Source
AI summary
An electrostatic preventing device for light emitting diodes (LED), operative to backlight a liquid crystal display (LCD) device is disclosed. The device includes RGB assemblies installed on a flexible circuit board, and an electrostatic preventing circuit separately installed on the flexible circuit board. The device is adapted to protect RGB LED chips inside each RGB package for backlight, mounted in the RGB assemblies, from static electricity.