Polarizing Plate Depolarization Region With Low Roughness Stability
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Solution Overview
Problem
Existing polarizing plates face challenges in achieving a durable depolarization region with minimal irregular roughness, which affects the durability of the polarization region, and exhibit high light transmittance variation under high temperature and humidity conditions.
Innovation Solution
A polarizing plate with a depolarization region having a crystallinity ratio of 60% or more, a total remaining-iodine content of 0.1% to 1.5% by weight, and a surface roughness of 3.0 nm or less, integrated with a polarization region, is manufactured using pulsed UV beams and optionally femtosecond laser beams, ensuring consecutive formation without separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a depolarization region is formed in the polarizing plate using conventional methods (chemical, physical, or optical), then the depolarization function is achieved, but the durability of the depolarization region becomes lower than the polarization region and irregular roughness occurs
Solution Approach 1:
The patent applies parameter changes by controlling the crystallinity ratio of the depolarization region to be 60% or more, and adjusting the remaining iodine content to 0.1% to 1.5% by weight. These parameter optimizations resolve the contradiction by achieving both high durability through controlled crystallization and smooth surface finish with Ra of 3.0 nm or less, eliminating irregular roughness while maintaining depolarization function.
Solution Approach 2:
The patent applies local quality by creating a depolarization region with distinct local properties (crystallinity ratio ≥60%, specific iodine content 0.1-1.5%) within the polarizing plate. This localized control of material properties allows the depolarization region to have enhanced durability and controlled surface roughness (Ra ≤3.0 nm) that differs from the surrounding polarization region, resolving the contradiction between durability and surface quality.
2Adaptability or versatility
If the depolarization region is made consecutive to the polarization region to coexist in a single polarizing plate, then the integrated structure is achieved, but the poor durability of the depolarization region affects the durability of the polarization region
Solution Approach 1:
The patent applies parameter changes by optimizing the crystallinity ratio of the depolarization region to be 60% or more and controlling the remaining iodine content within 0.1% to 1.5% by weight. These parameter optimizations create a durable interface between the consecutive polarization and depolarization regions, preventing the poor durability of the depolarization region from compromising the overall structure while maintaining functional integration.
Solution Approach 2:
The patent applies beforehand cushioning by pre-controlling the crystallinity and iodine content parameters of the depolarization region before it can negatively affect the polarization region. This preventive approach ensures that the depolarization region has sufficient durability (Ra ≤3.0 nm, crystallinity ≥60%) to protect the consecutive polarization region from degradation, maintaining the integrity of the integrated structure.
3Reliability
If the polarizing plate is tested under high temperature and humidity conditions, then the environmental stability is evaluated, but the light transmittance of the depolarization region varies significantly
Solution Approach 1:
The patent applies parameter changes by optimizing the crystallinity ratio to 60% or more and controlling the remaining iodine content at 0.1% to 1.5% by weight in the depolarization region. These parameter optimizations stabilize the optical properties under high temperature and humidity conditions, reducing light transmittance variation while maintaining the depolarization function and achieving environmental stability.
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 provides a polarizing plate with improved durability, reduced light transmittance variation under high temperature and humidity, and clear image quality by minimizing surface roughness and maintaining consistent optical characteristics.
Implementation Method 1
a physical method, or an optical method using femtosecond or picosecond laser irradiation
Implementation Method 2
the polarizer is formed with a depolarization region on at least part thereof and has a crystallinity ratio of about 60% or more
Data Source
AI summary
Provided are a polarizing plate and an optical display device comprising same, the polarizing plate comprising a polarizer and a protective film formed on at least one surface of the polarizer, wherein the polarizer has a depolarization region on at least a part thereof, and the polarizer has a crystallization degree of formula 1 of about 60% or greater.