Polarizing Plate Structure for Humidity-Stable Antireflection
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Solution Overview
Problem
Organic light emitting diode displays suffer from deterioration in visibility and contrast due to reflection of external light, and existing polarizing plates fail to maintain antireflection function under high temperature and humidity conditions due to polarization performance degradation.
Innovation Solution
A polarizing plate comprising a polarizer, an antireflection film, and a retardation film with specific water vapor transmission rates and optical properties, including positive wavelength dispersion, to enhance reliability and reduce reflectivity and reflected color sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patterned layer is added to the polarizing plate to impart antireflection effect, then the antireflection function is improved, but the device complexity and manufacturing process increase
Solution Approach 1:
The patent combines the antireflection function and polarization function into a single integrated polarizing plate structure. The polarizer itself is designed to provide both polarization and antireflection effects, eliminating the need for a separate patterned layer. This merging of functions reduces structural complexity while maintaining the antireflection performance.
2Adaptability or versatility
If the polarizer is left at high temperature and/or under high temperature/humidity conditions for a long period of time, then the manufacturing and usage conditions are flexible, but the polarization performance deteriorates due to shrinkage
Solution Approach 1:
The patent applies preliminary stretching to the polarizer at controlled temperature and humidity conditions before final assembly. This preliminary action pre-compensates for the shrinkage that will occur during subsequent high-temperature storage or usage, ensuring that the polarizer maintains its polarization performance even after exposure to harsh environmental conditions.
3Reliability
If the polarizing plate is designed to prevent reflected external light from leaking out, then the antireflection function is improved, but the visibility and contrast may deteriorate under certain conditions
Solution Approach 1:
The patent applies local quality by creating specific optical properties in different regions or layers of the polarizing plate. The polarizer is designed with localized optical characteristics that selectively block reflected external light while allowing display light to pass through. This localized optimization ensures that antireflection function is enhanced without compromising the visibility and contrast of the display.
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 polarizing plate maintains good screen quality and reliability under high temperature and humidity conditions, achieving low reflectivity and specific reflected color values, improving black visibility without a patterned layer.
Implementation Method 1
Polarization performance may be imparted by the polarizer uniaxially stretched at high elongation
Implementation Method 2
the retardation film has an in-plane retardation Re of 3,000 nm or more at a wavelength of 550 nm and exhibits positive wavelength dispersion
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; an antireflection film stacked on a first surface of the polarizer; and a retardation film stacked on a second surface of the polarizer, and the antireflection film has a water vapor transmission rate of 1 g/m2·day to 30 g/m2·day, and the retardation film has a water vapor transmission rate of 1 g/m2·day to 100 g/m2·day.