Wire Grid Polarizer Sacrificial Electrode Corrosion Protection
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Solution Overview
Problem
Wire grid polarization apparatuses face corrosion issues under high temperature and high humidity conditions, which impair polarization separation performance, especially when wire-shaped metal layers made of aluminum or silver corrode, and existing protection methods like aminophosphonate-unimolecular layers compromise polarization performance.
Innovation Solution
A sacrificial electrode with a higher ionization tendency than the wire-shaped metal layers is provided outside the effective region, electrically coupled to the wire-shaped metal layers, acting as a positive electrode when in contact with water, preventing corrosion without affecting polarization separation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer including an aminophosphonate-unimolecular layer is provided on the surface of wire-shaped metal layers, then corrosion resistance is improved, but polarization separation performance deteriorates
Solution Approach 1:
The harmful function (corrosion protection) is extracted from the optical region and relocated to a peripheral sacrificial electrode structure. The wire-shaped metal layers in the effective area remain uncovered to maintain polarization performance, while corrosion protection is provided separately by the sacrificial electrode in the non-effective area.
Solution Approach 2:
A sacrificial electrode made of metal with higher ionization tendency (such as magnesium or zinc) is introduced as an intermediary element. This sacrificial electrode acts as a mediator that preferentially corrodes through galvanic action, protecting the wire-shaped metal layers without interfering with their optical function in the effective area.
2Manufacturing precision
If wire-shaped metal layers are exposed without protection under high temperature and high humidity conditions, then polarization separation performance is maintained, but corrosion resistance deteriorates
Solution Approach 1:
The sacrificial electrode is pre-positioned in the non-effective area and electrically connected to the wire-shaped metal layers before exposure to harsh environments. This preliminary arrangement ensures that when high temperature and high humidity conditions occur, the galvanic protection mechanism is already in place to prevent corrosion of the wire-shaped metal layers.
Solution Approach 2:
The harmful effect of electrochemical corrosion is converted into a beneficial protective mechanism. The sacrificial electrode intentionally undergoes corrosion (the harmful effect) through galvanic action, but this process benefits the wire-shaped metal layers by preventing their corrosion. The harm to the sacrificial electrode translates into protection for the functional metal layers.
3Reliability
If a sacrificial electrode is provided outside the effective region, then corrosion resistance is improved without affecting polarization separation performance, but device complexity increases
Solution Approach 1:
The corrosion protection function is localized to the non-effective area where it is not needed for optical performance. The wire-shaped metal layers in the effective area maintain their original simple structure for optimal polarization function, while the sacrificial electrode is added only in the peripheral non-effective region, creating local differentiation in structure and function.
Solution Approach 2:
The sacrificial electrode is merged with the existing substrate or frame structure of the wire grid polarization apparatus. By integrating the protective function into the peripheral structure rather than adding a separate complex system, the increase in device complexity is minimized while still achieving effective corrosion protection.
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 sacrificial electrode effectively prevents corrosion of the wire-shaped metal layers while maintaining the polarization separation performance of the wire grid polarization apparatus, even under high temperature and high humidity conditions.
Implementation Method 1
when the wire-shaped metal layers come into contact with water under a condition of high temperature and high humidity, and water is present between the wire-shaped metal layers and the sacrificial electrode, the sacrificial electrode serves as a positive electrode, while the wire-shaped metal layers serve as a negative electrode. This prevents the wire-shaped metal layers from being corroded.
Implementation Method 2
the sacrificial electrode including metal having an ionization tendency greater than an ionization tendency of the wire-shaped metal layers
Data Source
AI summary
A wire grid polarization apparatus includes a plurality of wire-shaped metal layers arranged in parallel to each other in a region, on which light is incident, on a side of a first surface of a transmissive substrate. The wire-shaped metal layers include aluminum or silver as a principal component. Outside the region, a sacrificial electrode having an ionization tendency greater than an ionization tendency of the wire-shaped metal layers is electrically coupled to the wire-shaped metal layers. This allows the sacrificial electrode to prevent the wire-shaped metal layers from being corroded under a condition of high temperature and high humidity. Being provided outside the region, the sacrificial electrode does not impair polarization separation performance.