Wire Grid Polarization Element Gradient Mixture Layer
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Solution Overview
Problem
Wire grid polarization elements face issues with reflection and adhesion problems due to interfaces between different layers, particularly under high temperature conditions, which affect their reliability and performance.
Innovation Solution
The introduction of mixture portions with gradually changing compositions between different sections of the reflection and absorption layers in the wire grid, eliminating interfaces and preventing reflection and adhesion issues, is achieved by controlling the deposition speeds of elements during film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers (dielectric film, absorption layer, oxide film) are laminated on the reflection layer to improve reliability and reduce reflectance, then the performance is improved under high brightness and high temperature conditions, but interfaces are created between layers which cause reflection and adhesion problems
Solution Approach 1:
A gradient layer is introduced as an intermediary between layers with different compositions. This gradient layer has a composition that gradually transitions from one layer to another, acting as a mediator that reduces the abrupt refractive index difference at interfaces, thereby suppressing reflection while maintaining the functionality of the laminated structure.
Solution Approach 2:
The composition of the gradient layer is designed to gradually change from the composition of the first layer to the composition of the second layer. By continuously varying the material composition parameter across the gradient layer thickness, the refractive index changes gradually, eliminating the abrupt interface that causes reflection and adhesion problems.
2Object-generated harmful factors
If a gradient layer with gradually changing composition is introduced between layers, then reflection and adhesion problems are suppressed, but the device complexity and manufacturing process become more complicated
Solution Approach 1:
Instead of creating a physically complex multi-layer structure, the solution changes the composition parameter continuously within a single gradient layer. This approach achieves the desired optical performance without adding significant structural complexity or manufacturing difficulty, as the gradient can be formed using standard deposition techniques with controlled composition variation.
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 solution enhances the transmission efficiency of linearly polarized light and maintains strong adhesion between layers even at high temperatures, reducing the occurrence of reflection and adhesion problems.
Implementation Method 1
a first mixture portion is provided between a first portion on the substrate side of the reflection section and a second portion at an edge on an opposite side of the reflection section from the substrate, and in the first mixture portion a proportion of the at least one element of oxygen, nitrogen, and carbon gradually decreases and a proportion of an element of the light reflective material gradually increases from the second portion to the first portion
Data Source
AI summary
In a wire grid polarization element where wires are arranged in parallel on one surface of the substrate, each of the wires includes in a thickness direction thereof a reflection section composed primarily of a light reflective material and an absorption section composed primarily of a light absorptive material. The reflection section includes oxygen. Between a first portion on the substrate side of the reflection section and a second portion at an edge on an opposite side the reflection section from the substrate, is provided a mixture portion (a first mixture portion) where a proportion of oxygen gradually decreases and a proportion of aluminum which is the light reflective material gradually increases from the second portion to the first portion. Thus, even when the reflection section is provided with portions having different compositions, development of an interface does not occur inside the reflection section.