Polarizing Plate Retardation Layer for UV Blocking Without Color Loss
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Solution Overview
Problem
Existing optical films in display devices require ultraviolet blocking properties but commercially available ultraviolet absorbers or light stabilizers affect image quality by blocking visible light and impair polymerizable liquid crystal orientation, leading to reduced durability.
Innovation Solution
A polarizing plate with a retardation layer designed to selectively block ultraviolet rays without using ultraviolet absorbers or light stabilizers, achieving durability and maintaining display quality by combining a polarizer with a retardation layer having controlled optical properties for specific ultraviolet wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ultraviolet absorbers or light stabilizers are introduced into optical films to block ultraviolet rays, then ultraviolet blocking properties are improved, but visible light absorption increases and image quality deteriorates
Solution Approach 1:
The patent divides the optical film structure into multiple functional layers: a polarizing layer and a retardation layer. The ultraviolet blocking function is specifically assigned to the retardation layer, while the polarizing layer maintains visible light transmission. This segmentation allows each layer to optimize its specific function without interfering with the other, resolving the contradiction between ultraviolet blocking and visible light transmission.
Solution Approach 2:
The retardation layer acts as an intermediary between the polarizing layer and the external environment. It selectively absorbs ultraviolet rays while allowing visible light to pass through to the polarizing layer, thereby mediating the conflict between ultraviolet protection and visible light transmission by filtering only the harmful wavelength range.
2Object-affected harmful factors
If ultraviolet absorbers or light stabilizers are included in the retardation layer, then ultraviolet blocking properties are improved, but liquid crystal orientation and polymerization are impaired, reducing durability
Solution Approach 1:
The patent extracts the ultraviolet blocking function from the retardation layer's material composition and instead implements it through the structural design of the layered system. The retardation layer uses its inherent optical properties and positioning within the structure to block ultraviolet rays, eliminating the need for ultraviolet absorber additives that would interfere with liquid crystal orientation and polymerization.
Solution Approach 2:
The layered structure of the optical film serves its own ultraviolet protection function through the strategic placement and optical properties of the retardation layer. The system protects itself from ultraviolet damage without requiring additional chemical additives, thereby maintaining the integrity of the liquid crystal layer's orientation and polymerization processes.
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 blocks ultraviolet rays without affecting display performance, ensuring stability and durability while maintaining excellent image quality.
Implementation Method 1
a polymerizable liquid crystal compound that has reverse wavelength dispersion properties
Implementation Method 2
the cured layer formed by curing the polymerizable liquid crystal composition has a transmittance of 3% or less for light having a wavelength of 385 nm
Implementation Method 3
since most of the polymerizable liquid crystal compounds are ultraviolet polymerizable
Data Source
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AI summary
The present application relates to a polarizing plate and a display device including the same. The present application can provide a polarizing plate comprising a retardation layer exhibiting ultraviolet blocking characteristics even in a state where any ultraviolet absorber or light stabilizer is not blended. In addition, the present application can provide a polarizing plate which can be used alone or in combination with an appropriate sunscreen or a light stabilizer as needed to selectively block ultraviolet rays in a region requiring blocking, without affecting display performance, such as color senses and image quality, of a display device, can also be formed thinly without requiring a separate ultraviolet blocking layer, and also has excellent durability, because the polarizing plate exhibits a certain ultraviolet blocking property even in the absence of an ultraviolet absorber or light stabilizer.