Thin Polarizer Absorbance Control for Heat Resistance
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Solution Overview
Problem
Conventional polarizing plates with small thicknesses are prone to red discoloration during heat resistance tests, and existing methods to suppress this issue, such as adding zinc ions, pose environmental and health concerns, while being insufficiently effective.
Innovation Solution
A polarizing plate with a polarizer thickness of less than or equal to 10 μm, characterized by an absorbance ratio A700/A450 greater than or equal to 0.85 and an absolute difference in absorbance between A700 and A450 of less than or equal to 0.11 after heat treatment, which effectively resists red discoloration by maintaining neutral display and high heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the polarizer thickness is reduced to make the polarizing plate thinner and lighter, then the portability and modern design requirements are met, but red discoloration occurs during heat resistance tests
Solution Approach 1:
The patent applies parameter changes by precisely controlling the absorbance ratio A700/A450 to be 0.85 or more and the absolute difference |A700 - A450| to be 0.11 or less. These parameter specifications ensure that the polarizer maintains optical stability and resists red discoloration during heat resistance tests while keeping the thickness at 10 μm or less
Solution Approach 2:
The patent uses composite materials by combining specific dichroic dyes with polyvinyl alcohol base materials. This composite structure enables the thin polarizer to achieve both the required optical properties (absorbance ratio and difference control) and heat resistance, preventing red discoloration while maintaining thinness
2Reliability
If conventional methods like adding zinc ions are used to suppress red discoloration, then heat resistance is improved, but environmental pollution and skin irritation problems arise
Solution Approach 1:
The patent extracts and eliminates harmful substances like zinc ions from the polarizer composition. Instead of using conventional metal ion additives that cause environmental pollution and skin irritation, the patent achieves heat resistance and red discoloration prevention through controlled dye selection and absorbance parameter optimization, completely removing the harmful additives
Solution Approach 2:
The patent replaces expensive and harmful metal ion additives with organic dichroic dyes that are environmentally friendly. The organic dye-based solution provides the same heat resistance function without the harmful side effects, effectively substituting toxic materials with safer alternatives
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 prevents red discoloration and maintains neutral display in polarizing plates, even under prolonged heat resistance testing, ensuring high heat resistance and reducing production losses by predicting discoloration before protective films are bonded.
Implementation Method 1
a polarizer having a thickness less than or equal to 10 μm, the polarizing plate having a ratio A700/A450 of absorbance A700 at a wavelength of 700 nm to absorbance A450 at a wavelength of 450 nm greater than or equal to 0.85
Data Source
AI summary
Provided are a polarizing plate including a polarizer having a thickness less than or equal to 10 μm and having a ratio A700/A450 of absorbance A700 at a wavelength of 700 nm to absorbance A450 at a wavelength of 450 nm greater than or equal to 0.85; a polarizer having a thickness less than or equal to 10 μm and having an absolute value of a difference between absorbance A700 at a wavelength of 700 nm and absorbance A450 at a wavelength of 450 nm less than or equal to 0.11 after heat-treated at 100° C. for 30 minutes; and a polarizing plate including such a polarizer.