Laser Ablation Perimeter for Optical Defect Isolation
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Solution Overview
Problem
Optical devices, such as electrochromic windows, often suffer from defects like electrical short circuits that are visually discernible and unattractive, despite advancements in manufacturing, and existing methods for defect mitigation can lead to further shorting issues due to excessive energy flux during laser ablation.
Innovation Solution
A method of forming a laser ablation perimeter around defects in optical devices, where the laser focus is started and stopped within the perimeter area to minimize overlap and energy flux, allowing for precise electrical isolation without causing additional shorting, using patterns that ensure uniform energy delivery and containment of excess energy within the perimeter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser ablation is applied to eliminate defects in optical devices, then visible defects are removed, but excessive energy flux causes further shorting issues
Solution Approach 1:
The patent applies partial action by delivering laser energy in controlled pulses rather than continuous exposure. The laser is applied at multiple discrete locations around the defect perimeter, with each pulse providing just enough energy to ablate material and create isolation trenches, avoiding excessive energy delivery that would cause collateral damage or additional shorting.
Solution Approach 2:
The patent implements local quality by concentrating laser energy precisely at the defect perimeter locations rather than applying uniform energy across the entire defect area. The laser creates localized ablation trenches around the defect, providing targeted material removal and electrical isolation exactly where needed, while leaving the surrounding functional areas undisturbed.
2Reliability
If laser ablation perimeter is formed around defects, then electrical isolation is achieved, but overlapping laser focus creates excessive energy flux
Solution Approach 1:
The patent carefully controls the degree of overlap between laser pulses to achieve just sufficient perimeter closure without excessive energy accumulation. The overlap is optimized to ensure continuous electrical isolation around the defect while maintaining energy levels that prevent additional shorting or material damage at the overlap regions.
3Manufacturing precision
If manufacturing precision is improved to reduce defects, then defectivity levels decrease, but some defects still manifest during testing and deployment
Solution Approach 1:
The patent applies preliminary action by implementing laser defect mitigation during the manufacturing process itself, before the device is deployed. By identifying and treating potential defects while the device is still in production, the method prevents defects from manifesting during testing and operation, thereby improving long-term reliability without requiring post-deployment interventions.
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 approach effectively mitigates visible defects by creating small, less noticeable pinholes instead of halos, reducing the risk of further shorting and ensuring a uniform, stable optical performance.
Implementation Method 1
forming an ablation perimeter surrounding defects in optical devices
Implementation Method 2
laser ablation perimeter
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
Methods of circumscribing defects in optical devices are described. A perimeter is formed about a defect by laser ablation, where the perimeter electrically isolates the defect. The perimeter does not have damage due to excess energy from the laser and thus does not create new electrical shorts.