Polarizing Plate Scattering Adhesive for OLED Rainbow Stain Reduction
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Solution Overview
Problem
The occurrence of rainbow stains in OLED display devices is intensified when luminance is increased, deteriorating the appearance and visual appreciation, and existing solutions do not adequately address the issue of hardness and durability.
Innovation Solution
A polarizing plate comprising a polarizer and a scattering pressure-sensitive adhesive layer with specific haze and elastic modulus, incorporating scattering particles and a cross-linked structure to improve visibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the OLED display panel is increased, then the brightness and visibility are improved, but the rainbow stain phenomenon is intensified, deteriorating the appearance visual appreciation
Solution Approach 1:
The patent introduces a scattering pressure-sensitive adhesive layer as an intermediary component between the polarizer and the OLED display panel. This layer contains scattering particles that diffuse light and reduce the rainbow stain phenomenon caused by high luminance, thereby mediating between the brightness requirement and the appearance quality requirement.
Solution Approach 2:
The patent changes the optical parameters of the adhesive layer by incorporating scattering particles with specific refractive indices and size distributions. This modifies the light scattering properties of the system, reducing rainbow stains while maintaining acceptable visual appearance at high luminance levels.
2Ease of manufacture
If a conventional pressure-sensitive adhesive layer is used, then the polarizing plate can be manufactured simply, but the hardness and durability (heat-resistance and moisture-and-heat-resistance) are insufficient
Solution Approach 1:
The patent creates a composite pressure-sensitive adhesive layer by combining a base adhesive material with scattering particles. This composite structure provides both the manufacturing simplicity of a coating process and the enhanced hardness and durability from the composite formulation, including cross-linkable groups that improve thermal and moisture resistance.
3Object-affected harmful factors
If the scattering pressure-sensitive adhesive layer has high haze (12% or more), then the rainbow stain phenomenon is reduced, but the light transmittance decreases
Solution Approach 1:
The patent applies local quality by creating a scattering layer with specific optical properties (haze ≥12%) only where needed to reduce rainbow stains, while maintaining other regions with higher transmittance. The scattering particles are distributed to provide localized light diffusion without uniformly reducing transmittance across the entire 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 effectively reduces rainbow stains, enhances visual appreciation, and provides excellent hardness and heat/moisture-resistance durability, improving the overall performance of OLED display devices.
Implementation Method 1
a scattering pressure-sensitive adhesive layer present on one side of the polarizer... a pressure-sensitive adhesive layer comprising scattering particles that may cause haze in the pressure-sensitive adhesive layer
Implementation Method 2
the term 'curing of the pressure-sensitive adhesive or adhesive composition' may mean implementing a cross-linked structure in the pressure-sensitive adhesive or adhesive composition through physical or chemical action or reaction
Data Source
AI summary
The present application relates to a polarizing plate and a use thereof. The present application provides a polarizing plate capable of improving the problem of occurrence of rainbow stains in the appearance of an OLED display device, and exhibiting excellent visual appreciation, excellent hardness, and excellent heat-resistance and moisture-and-heat-resistance durability, and an OLED display device comprising the polarizing plate.