Wire Grid Polarizer Phosphonate Coating Corrosion Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wire grid polarizers (WGPs) face degradation due to oxidation, corrosion, and mechanical damage, leading to reduced performance and contrast, especially in extreme environments, where existing protective coatings may not provide sufficient protection without affecting polarizer performance.
Innovation Solution
The use of a conformal-coating with a phosphonate chemical, including hydrophobic groups, applied over the ribs of WGPs to form a barrier that protects against oxidation, corrosion, and mechanical damage, while maintaining minimal thickness to avoid performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective coating is applied to protect WGPs from oxidation and corrosion, then reliability is improved, but Tp may be reduced due to coating interference
Solution Approach 1:
The patent applies a thin conformal coating layer over the WGP ribs that provides protection while minimizing optical interference. The coating is designed to be sufficiently thin to maintain high Tp while providing adequate corrosion and oxidation protection, resolving the contradiction between reliability improvement and transmission preservation.
Solution Approach 2:
The protective coating is formulated as a composite material with specific properties that balance protection and optical transparency. By using composite materials with appropriate optical characteristics, the coating provides corrosion protection while maintaining high transmission of polarized light, thus resolving the contradiction between reliability and illumination intensity.
2Reliability
If a thicker protective coating is applied to provide sufficient oxidation or corrosion protection, then reliability is improved, but polarizer performance degrades more
Solution Approach 1:
The patent employs a thin conformal coating that provides adequate protection without requiring excessive thickness. This thin film approach achieves the necessary corrosion and oxidation protection while minimizing performance degradation, directly resolving the contradiction between reliability improvement and productivity maintenance.
Solution Approach 2:
The coating provides preliminary protection against oxidation and corrosion before they can degrade the WGP performance. By establishing this protective barrier in advance with minimal thickness, the system prevents future degradation while maintaining current performance levels, resolving the contradiction between reliability and productivity.
3Reliability
If water condenses onto the WGP and wicks into narrow channels between ribs, then corrosion increases, but the coating should prevent this
Solution Approach 1:
The conformal coating forms a continuous protective shell over the WGP ribs and gaps, preventing water condensation and capillary wicking into the narrow channels. This thin film barrier effectively blocks the harmful effects of moisture while maintaining the structural integrity of the WGP, resolving the contradiction between corrosion resistance and protection against water-related harmful factors.
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 conformal-coating effectively protects WGPs from oxidation, corrosion, and mechanical stress, maintaining high transmission and contrast ratios, and preventing rib damage, thus enhancing the longevity and performance of the polarizers.
Implementation Method 1
The conformal-coating can include a phosphonate chemical: where R1 can include a hydrophobic group
Implementation Method 2
Water can condense onto the WGP and wick into narrow channels between ribs due to capillary action
Data Source
AI summary
A wire grid polarizer (WGP) can have a phosphonate conformal-coating to protect the WGP from at least one of the following: corrosion, dust, and damage due to tensile forces in a liquid on the WGP. The conformal-coating can include a chemical:where R1 can include a hydrophobic group, Z can be a bond to the ribs, and R5 can be any suitable chemical element or group.A method of applying a phosphonate conformal-coating over a WGP can include exposing the WGP to (R1)iPO(R4)j(R5)k, where: i is 1 or 2, j is 1 or 2, k is 0 or 1, and i+j+k=3; each R1 can independently be a hydrophobic group; R4 can be a phosphonate-reactive-group; each R6 can independently be an alkyl group, an aryl group, or combinations thereof; and each R5, if any, can independently be any suitable chemical element or group.