Antireflection Polarizing Plate for OLED Panels
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Solution Overview
Problem
Existing polarizing plates for antireflection in OLED panels suffer from reduced luminance, curling, bending, and dispersion of reflection color, while also being prone to cut-off during the preparation process, and have limited transmittance and polarization efficiency.
Innovation Solution
A thin polarizing plate with a polarizer and protective layers, a λ/4 retardation layer, and a pressure-sensitive adhesive, designed to maintain high transmittance and polarization efficiency, control shrinkage, and prevent curling and bending, by optimizing stretching ratios and crosslinking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizing plate with linear polarizer and λ/4 retardation layer is attached to block reflection, then external light reflection is reduced and black visibility is achieved, but the luminance of the OLED panel is lowered
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the polarizer layer and adjusting the stretching ratio during manufacturing to achieve high transmittance (44.6% or more) while maintaining the degree of polarization (98% or more). This allows the polarizing plate to block reflection effectively while minimizing the reduction in luminance.
Solution Approach 2:
The patent uses composite materials by combining the polarizer layer with protective layers and retardation layers in a multi-layer structure. This composite design enables the plate to perform multiple functions: blocking reflection, maintaining luminance, and providing mechanical protection, thereby resolving the contradiction between reflection blocking and luminance maintenance.
2Length of moving object
If the polarizing plate is made thinner to reduce panel thickness, then the display device becomes thinner, but the polarizer is prone to cut-off during preparation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the polarizer layer and optimizing the stretching ratio during manufacturing. By maintaining the thickness within a specific range and controlling the stretching ratio to be 3.5-5.5 times, the patent achieves thin panel construction while preventing polarizer cut-off during preparation.
3Illumination intensity
If the polarizing plate is stretched to improve transmittance and polarization, then optical performance is enhanced, but curling and bending occur after adherence
Solution Approach 1:
The patent applies parameter changes by controlling the stretching ratio to be within 3.5-5.5 times and maintaining the shrinkage rate at 0.5% or less after standing at 85°C for 240 hours. This precise control prevents excessive stretching that would cause curling and bending while still achieving the desired optical performance.
Solution Approach 2:
The patent applies preliminary action by performing stretching and crosslinking treatments before final assembly and adherence. By controlling the stretching ratio and crosslinking conditions in advance, the patent prevents subsequent curling and bending after the panel is assembled, maintaining flatness while achieving high transmittance.
4Stability of the object's composition
If the polarizing plate is heated to control shrinkage, then dimensional stability is improved, but retardation change occurs causing reflection color dispersion
Solution Approach 1:
The patent applies parameter changes by controlling the heating temperature to 85°C and limiting the shrinkage rate to 0.5% or less after standing for 240 hours. This precise temperature and time control maintains dimensional stability while minimizing retardation changes that would cause reflection color dispersion.
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 suppresses curling and bending, maintains high transmittance and polarization, and prevents cut-off during preparation, while ensuring uniform reflection color and improved panel stability.
Implementation Method 1
a polarizer, and a protective layer formed on at least one surface of the polarizer
Implementation Method 2
the polarizing plate has a single transmittance of 44.6% or more and a degree of polarization of 98% or more
Implementation Method 3
a protective layer formed on at least one surface of the polarizer
Implementation Method 4
a retardation layer laminated on the opposite side of the viewing side of the polarizer having the protective layer on at least one surface thereof
Data Source
AI summary
Provided are a polarizing plate for antireflection containing 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 a shrinkage rate in stretching direction of the polarizing plate is 0.5% or less after standing at 85° C. for 240 hours, and a display device including the polarizing plate. The polarizing plate is resistant to curling, prevents bending of a panel occurring after adherence of the panel, and reduces dispersion of reflection color depending on the position, while exhibiting high transmittance. Further, the polarizing plate can be made thinner, and prevent the polarizer from being cut off during a preparation process.