Optical Diffuser Conductive Pillars for ESD Protection
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Solution Overview
Problem
Electronic and optical devices, including optical diffusers, are vulnerable to damage from electrostatic discharges.
Innovation Solution
An optical diffuser design featuring a conductive track with conductive pillars extending across a second layer, and a region beneath the track free of pillars, combined with a conductive portion and encapsulation layer, to mitigate electrostatic discharge damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive pillars are added to protect against electrostatic discharge, then reliability improves, but device complexity increases
Solution Approach 1:
The conductive layer is segmented into multiple conductive pillars distributed across the substrate, rather than using a continuous conductive layer. This segmentation provides electrostatic discharge protection through multiple discrete pathways while maintaining optical performance by leaving gaps between pillars that allow light transmission.
Solution Approach 2:
The conductive pillars are strategically positioned in specific regions where electrostatic discharge protection is most needed, rather than uniformly distributing conductive material across the entire device. This localized approach provides targeted protection while minimizing impact on optical properties.
2Reliability
If conductive pillars are added to protect against electrostatic discharge, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The formation of conductive pillars is merged with existing manufacturing steps in the optical device fabrication process. The pillars are created using standard lithography and deposition techniques that are already part of the manufacturing workflow, thereby adding protection functionality without requiring entirely new manufacturing processes.
3Reliability
If conductive pillars extend across entire thickness of second layer, then electrostatic discharge protection improves, but light diffusion capability may deteriorate
Solution Approach 1:
The conductive pillars are designed with specific local characteristics - they extend through the second layer to provide electrostatic protection, but their diameter and spacing are locally optimized to maintain light diffusion. The pillars are positioned and dimensioned to provide protection where needed while preserving optical functionality.
Solution Approach 2:
The parameters of the conductive pillars (diameter, spacing, depth) are carefully controlled and optimized. By adjusting these parameters, the design achieves a balance where the pillars provide sufficient electrostatic discharge protection while their small size and spacing allow light to pass through and maintain diffusion capabilities.
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
The design effectively reduces damage from electrostatic discharges while maintaining light diffusion capabilities, and the manufacturing process is similar to standard optical diffusers with minimal additional steps.
Implementation Method 1
Electronic and optical devices, including optical diffusers, are vulnerable to damage from electrostatic discharges
Implementation Method 2
the pillars are made of a material selected from the group comprising: amorphous silicon, polysilicon, and any other material having an optical index different from that of the material of the second layer
Data Source
AI summary
The present description concerns an optical diffuser including a first layer having an electrically-conductive track formed therein, and a second layer, having the first layer resting thereon resting thereon, and having at least two electrically-conductive pillars extending across the entire thickness of the second layer formed therein. The second layer includes at least one first region located under the conductive track comprising no pillar.