Wire Grid Polarizing Plate Protection Layer Design
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Solution Overview
Problem
Conventional wire grid-type inorganic polarizing plates face challenges in maintaining high transmittance characteristics while achieving high durability, especially when exposed to harsh environments such as high temperature and humidity, leading to oxidation and corrosion that affect optical characteristics.
Innovation Solution
A polarizing plate with a wire grid structure featuring a transparent substrate, a grid-shaped projecting portion with a reflection layer, dielectric layer, and absorption layer, and a protection layer that covers the upper and side surfaces of the absorption layer and dielectric layer, with the protection layer on the side surface of the reflection layer being thinner than on the absorption layer, and covering 50% or less of the side surface, to enhance durability and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is provided on the side surface of the grid-shaped projecting portion to improve durability, then durability is improved, but transmittance characteristics deteriorate
Solution Approach 1:
The protection layer is provided selectively on specific regions (side surfaces of absorption layer and dielectric layer, and partially on reflection layer) rather than uniformly across all surfaces. This localized protection approach ensures durability where most needed while minimizing interference with light transmission paths, thereby resolving the contradiction between durability improvement and transmittance maintenance.
Solution Approach 2:
The protection layer covers only 50% or less of the side surface area of the grid-shaped projecting portion, providing sufficient protection against environmental factors while limiting the amount of material that could interfere with optical performance. This partial coverage strategy achieves the necessary durability without excessive action that would harm transmittance.
2Object-affected harmful factors
If the protection layer covers more of the side surface to improve oxidation resistance, then oxidation resistance is improved, but light transmission is reduced
Solution Approach 1:
The protection layer is applied locally to areas most susceptible to oxidation (side surfaces exposed to environment) rather than covering all surfaces uniformly. This selective application provides oxidation resistance where needed while preserving light transmission in areas where the protection layer would interfere with optical performance.
Solution Approach 2:
The protection layer coverage is limited to 50% or less of the total side surface area, providing adequate oxidation resistance without excessive coverage that would block light transmission. This partial action approach balances protection needs with optical performance requirements.
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 configuration achieves high transmittance characteristics and durability by controlling the protection layer's thickness and coverage, preventing moisture ingress and oxidation, thereby maintaining optimal optical performance in harsh conditions.
Implementation Method 1
a protection layer (for example, a protection layer 15 to be described later) is provided on a surface of the grid-shaped projecting portion, and is configured to cover all of an upper surface and a side surface of the absorption layer and all of a side surface of the dielectric layer
Implementation Method 2
a polarizing plate is an optical element that absorbs polarized light in an absorption axis direction and transmits the polarized light in a transmission axis direction
Implementation Method 3
a polarizing plate is an optical element that absorbs polarized light in an absorption axis direction and transmits the polarized light in a transmission axis direction
Data Source
AI summary
Provided is a polarizing plate having high transmittance characteristics and high durability.A polarizing plate 1 with a wire grid structure includes a transparent substrate 10, and a grid-shaped projecting portion 11 which is arranged on the transparent substrate 10 at a pitch shorter than a wavelength of light in a used bandwidth and extends in a predetermined direction. The grid-shaped projecting portion 11 includes a reflection layer 12, a dielectric layer 13, and an absorption layer 14 in this order from the side of the transparent substrate 10. A protection layer 15 is provided on a surface of the grid-shaped projecting portion 11, and covers all of an upper surface and a side surface of the absorption layer 14 and all of a side surface of the dielectric layer 13, and at least a part of a side surface of the reflection layer 12. The protection layer 15 on the side surface of the reflection layer 12 is thinner than the protection layer 15 on the side surface of the absorption layer 14.