Light Emitting Element Array Asymmetric Wiring ESD Protection
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Solution Overview
Problem
In light emitting element arrays, particularly in optical transmission devices, the simultaneous damage of light emitting units due to electrostatic discharge (ESD) is a significant issue, leading to reduced service life and potential failure, as units with shorter current path lengths are more easily damaged, causing simultaneous failure and reduced optical output.
Innovation Solution
The configuration of light emitting element arrays ensures that only one light emitting unit has the shortest path length from the terminal, reducing the likelihood of simultaneous damage and extending the service life by providing an early warning for replacement, with a parallel connection of light emitting elements to maintain redundancy and ensure continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light emitting units are connected in parallel with equal path lengths from the terminal, then the device complexity is reduced and manufacturing is simplified, but the reliability decreases due to simultaneous damage from electrostatic discharge
Solution Approach 1:
The patent applies asymmetry by intentionally designing different path lengths for current flow to each light emitting unit. Specifically, one light emitting unit is configured with a shorter path length than others, creating an asymmetric wiring configuration. This asymmetry ensures that during electrostatic discharge, the units experience different stress levels, preventing simultaneous damage and extending the overall service life of the array.
2Ease of operation
If light emitting units with shorter path lengths are used, then the ease of operation is improved and current delivery is more efficient, but the object-affected harmful factors increase due to higher susceptibility to electrostatic discharge damage
Solution Approach 1:
The patent applies local quality by assigning different path length characteristics to different light emitting units based on their specific positions and roles in the array. Rather than using a uniform wiring configuration, each unit receives current through paths of varying lengths, locally optimizing the balance between current delivery efficiency and electrostatic discharge susceptibility for each position in the array.
Data Source
AI summary
A light emitting element array includes plural light emitting elements connected in parallel to each other by a wiring connected to a terminal configured to supply a current. The number of light emitting elements which have the shortest path length among path lengths on the wiring from the terminal to the respective light emitting elements along a path of the current is one.