Polarizer Transmittance Distribution via Cleaning Stage Stretch Ratio
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Solution Overview
Problem
Existing polarizers in liquid crystal displays (LCDs) face challenges in achieving high transmittance with minimal transmittance distribution and thickness deviation, while maintaining a high Young's modulus and low Poisson's ratio, due to the bowing phenomenon during the stretching process of polyvinyl alcohol films.
Innovation Solution
A polarizer is fabricated by adjusting the stretch ratio during the cleaning stage to minimize transmittance and thickness distribution, using a polyvinyl alcohol film that is swollen, dyed, and stretched within specific ranges to achieve a transmittance of 45% or more with a distribution of 0.3% or less, and a Poisson's ratio of 0.1 or less, and incorporating a protective film for additional optical functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the polyvinyl alcohol film is stretched during the cleaning stage, then the transmittance distribution is improved, but the thickness deviation increases due to the bowing phenomenon
Solution Approach 1:
The patent applies parameter changes by precisely controlling the stretch ratio during the cleaning stage to fall within a specific range (1.05 to 1.5). This controlled parameter adjustment optimizes the balance between improving transmittance distribution and minimizing thickness deviation caused by bowing during stretching.
2Illumination intensity
If the polyvinyl alcohol film is stretched to improve transmittance, then the transmittance increases, but the Poisson's ratio increases
Solution Approach 1:
The patent utilizes parameter changes by restricting the stretch ratio during cleaning to a specific range (1.05 to 1.5), which optimizes the balance between achieving high transmittance (45% or more) and maintaining low Poisson's ratio (0.1 or less).
3Illumination intensity
If the polyvinyl alcohol film is stretched to improve transmittance, then the transmittance increases, but the Young's modulus decreases
Solution Approach 1:
The patent applies parameter changes by controlling the stretch ratio during the cleaning stage within the range of 1.05 to 1.5, which optimizes the balance between achieving high transmittance (45% or more) and maintaining high Young's modulus (90 MPa or more).
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 method results in a polarizer with improved transmittance distribution, increased Young's modulus, and reduced Poisson's ratio, enhancing the optical performance and durability of the polarizing plate.
Implementation Method 1
a polarizer capable of polarizing light in a specific orientation
Implementation Method 2
the polyvinyl alcohol film is stretched at a stretch ratio of about 0.35 to about 1 during the cleaning
Data Source
AI summary
The present disclosure provides a polarizer having a transmittance of about 45% or more and a transmittance distribution of about 0.3% or less.