Metal-Wire Polarizer Coating for Heat-Resistant Polarization
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Solution Overview
Problem
Conventional polarizers with organic resin layers to enhance thermal resistance suffer from reduced polarization performance due to the resin affecting the reflection properties of metal wires, which is a challenge in high-brightness display projection systems.
Innovation Solution
A polarizer design featuring a light-transmissible substrate with parallel metal wires and a protective layer that covers the metal wires, providing improved heat resistance and polarization performance by minimizing oxidation and corrosion, while the gradient thickness of the protective layer enhances light extraction efficiency and thermal stress buffering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an organic resin layer is added to cover metal wires and fill air gaps, then thermal resistance is improved, but polarization performance deteriorates due to reduced reflection performance of metal wires
Solution Approach 1:
The patent extracts the harmful organic resin layer from the structure and replaces it with an inorganic protective layer (silicon oxide, silicon nitride, or silicon oxynitride). This removal eliminates the resin's negative impact on metal wire reflection performance while retaining thermal management capabilities through the inorganic layer's protective function.
Solution Approach 2:
The patent changes the material parameter from organic resin to inorganic material for the protective layer. This material substitution fundamentally alters the optical and thermal properties, enabling the layer to provide both thermal resistance and maintain polarization performance by preserving metal wire reflectivity.
2Reliability
If a protective layer completely covers metal wires to prevent oxidation and corrosion, then reliability is improved, but light extraction efficiency deteriorates due to increased reflection
Solution Approach 1:
The patent applies local quality by creating different thickness regions within the protective layer. The first portion has a first thickness optimized for protection, while the second portion has a second thickness (different from the first) optimized for light extraction. This spatial variation in thickness allows simultaneous achievement of corrosion resistance and light extraction efficiency.
Solution Approach 2:
The patent introduces thickness variation as an additional dimensional parameter to resolve the contradiction. By varying the protective layer thickness in the vertical dimension (first portion vs. second portion), the design optimizes both protective function and optical performance without compromising either requirement.
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 solution effectively enhances the heat resistance, reliability, and light-polarizing performance of the polarizer, improving peeling resistance and light extraction efficiency, while maintaining high thermal resistance and polarization performance.
Implementation Method 1
providing improved heat resistance and polarization performance by minimizing oxidation and corrosion
Implementation Method 2
the gradient thickness of the protective layer enhances light extraction efficiency
Implementation Method 3
the gradient thickness of the protective layer enhances thermal stress buffering
Implementation Method 4
a plurality of metal wires disposed on the substrate and arranged in parallel with spacings in-between
Data Source
AI summary
A polarizer includes a light-transmissible substrate, a plurality of metal wires, and a protective layer. The light-transmissible substrate has a mounting surface. The metal wires are parallelly arranged on the mounting surface of the light-transmissible substrate. Each of the metal wires extends in a direction parallel to the mounting surface, and has an upper surface and a peripheral surface. The protective layer has a first portion and a plurality of second portions. The first portion covers the upper surface of each of the metal wires and is formed into a continuous structure. Each of the second portions covers the peripheral surface of a respective one of the metal wires. Two adjacent ones of the second portions are spaced apart from each other. A light emitting device including the polarizer and a light emitting apparatus including the light emitting device are also disclosed.