Antireflection Polarizing Plate for OLED Displays
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Solution Overview
Problem
Existing polarizing plates for antireflection in OLED panels face challenges such as reduced luminance, blue-shift phenomenon, non-neutral reflection color, and difficulty in thinning, which affect display quality and visibility.
Innovation Solution
A polarizing plate comprising a polarizer with a protective layer, achieving a single transmittance of 44.6% or more and a degree of polarization of 98% or more, while satisfying specific color neutrality criteria, and optionally incorporating a retardation layer and pressure-sensitive adhesive layers for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transmittance of the polarizing plate is increased to maintain luminance, then the luminance is improved, but the blue-shift phenomenon occurs and reflection color becomes non-neutral
Solution Approach 1:
The patent applies parameter changes by precisely controlling the drying temperature and time of the polarizer to optimize the alignment of polymer chains and distribution of iodine molecules. By adjusting the primary drying temperature (40-80°C) and secondary drying temperature (80-105°C), the patent achieves the optimal balance between transmittance (44.6% or more) and degree of polarization (98% or more), while preventing blue-shift and maintaining neutral reflection color through controlled thermal parameters.
2Length of moving object
If the polarizing plate is made thinner to reduce display device thickness, then the device thickness is reduced, but the manufacturing precision and performance consistency become more difficult to control
Solution Approach 1:
The patent applies preliminary action by performing preliminary drying at a lower temperature (40-80°C) before the main drying process. This preliminary drying step prepares the polarizer by removing excess moisture and stabilizing the polymer chain alignment, which ensures that subsequent thinning to 8 μm or less can be achieved with consistent performance. The preliminary action prevents defects that would arise from direct high-temperature drying of thick films.
Solution Approach 2:
The patent uses parameter changes by implementing a two-stage drying process with specific temperature ranges. The primary drying at 40-80°C followed by secondary drying at 80-105°C allows precise control over the polarizer's physical and optical properties. This controlled thermal processing enables thinning to 8 μm or less while maintaining degree of polarization at 98% or more and transmittance at 44.6% or more, ensuring manufacturing precision and performance consistency.
3Reliability
If the degree of polarization is increased to improve antireflection performance, then the polarization performance is improved, but the transmittance decreases and luminance is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the drying conditions to achieve the optimal balance between polarization and transmittance. By controlling the primary drying temperature (40-80°C) and secondary drying temperature (80-105°C), the patent achieves degree of polarization of 98% or more while maintaining transmittance of 44.6% or more. This precise parameter control resolves the contradiction between polarization performance and luminance by finding the optimal operating point.
Solution Approach 2:
The patent uses composite materials by combining the polarizer (with controlled iodine distribution) and protective layer in a specific structure. The protective layer is formed on the polarizer through controlled drying, creating a composite structure where the polarizer provides polarization function and the protective layer provides mechanical support and surface protection. This composite structure enables achieving high degree of polarization (98% or more) while maintaining high transmittance (44.6% or more) by optimizing the interaction between the two materials.
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 proposed polarizing plate achieves high transmittance, prevents blue-shift phenomenon, maintains neutral reflection color, and allows for thinner designs, thereby improving display quality and visibility without compromising polarization performance.
Implementation Method 1
a polarizer, and a protective layer formed on at least one surface of the polarizer, wherein the polarizing plate has a single transmittance of 44.6% or more and a degree of polarization of 98% or more
Implementation Method 2
a protective layer formed on at least one surface of the polarizer
Implementation Method 3
the polarizer is prepared by primary drying in a range of 40° C. or more and less than 80° C. followed by secondary drying in a range of 80° C. or more and 105° C. or less
Data Source
AI summary
Provided are a polarizing plate for antireflection including a polarizer, and a protective layer formed on at least one surface of the polarizer, wherein the polarizing plate has a single transmittance of 44.6% or more and a degree of polarization of 98% or more and satisfies 0≤[(orthogonal a*)2+(orthogonal b*)2]0.5≤16, and a display device including the polarizing plate. The polarizing plate for antireflection can exhibit high transmittance while preventing blue-shift phenomenon and having neutral reflection color. Further, the polarizing plate for antireflection can be made thinner.