Coating-Type Optically Anisotropic Layer for Polarizing Plates
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Solution Overview
Problem
Conventional polarizing plates used in liquid crystal and organic electroluminescence displays suffer from reduced visibility when viewed through polarizing sunglasses, especially when the screen is tilted, due to internal reflection and the thickness of the polarizing plates making them difficult to manufacture thinly.
Innovation Solution
A polarizing plate is designed with a coating-type optically anisotropic layer and a molecule fixing layer to ensure uniform visibility across various viewing angles, incorporating a polarizer and optically anisotropic layers that convert incident light into circularly polarized radiation at different angles, maintaining visibility without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polarizing plate is used in displays, then the polarizing function is achieved, but the visibility is reduced when viewed through polarizing sunglasses especially at tilted angles
Solution Approach 1:
The patent applies a composite structure consisting of a polarizing plate and a wavelength plate (quarter-wave plate) with specific retardation. This composite optical system transforms linearly polarized light from the polarizing plate into circularly polarized light, which eliminates the visibility issues when viewed through polarizing sunglasses by ensuring uniform light transmission from all viewing angles.
Solution Approach 2:
The patent specifies precise optical parameters for the wavelength plate, including retardation values (λ/4 at specific wavelengths) and optical compensation characteristics. By controlling these optical parameters, the system achieves uniform visibility across different viewing angles and eliminates the harmful internal reflection effects that occur with conventional polarizing plates.
2Manufacturing precision
If the polarizing plate thickness is increased to improve manufacturing stability, then manufacturing precision is improved, but the overall display thickness increases
Solution Approach 1:
The patent employs thin-film optical components, specifically a wavelength plate with controlled thickness to achieve the required retardation. This allows the system to maintain manufacturing stability while keeping the overall display thickness minimal, as the thin film structure provides the necessary optical function without adding excessive bulk.
Solution Approach 2:
By combining the polarizing plate with a thin wavelength plate layer, the system achieves both manufacturing stability and thin profile. The composite structure allows each layer to be optimized independently - the polarizing plate for polarization stability and the wavelength plate for optical compensation - while maintaining overall thinness.
3Reliability
If a polarizing plate is added to shield luminescence in organic EL displays, then contrast is improved, but visibility through polarizing sunglasses is reduced
Solution Approach 1:
The patent applies a composite optical system combining a polarizing plate and a wavelength plate in organic EL displays. This combination maintains the high contrast ratio by blocking unwanted luminescence while simultaneously converting the polarized light into circularly polarized light, which prevents the visibility reduction that occurs when viewed through polarizing sunglasses.
Solution Approach 2:
The patent specifies precise optical parameters for the wavelength plate including retardation values and spectral characteristics that are optimized for organic EL display emissions. By controlling these parameters, the system achieves both contrast enhancement and compatibility with polarizing sunglasses viewing conditions.
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 provides a thin polarizing plate that maintains uniform visibility regardless of the viewing angle, preventing color shifts and ensuring high visibility even when viewed through polarizing sunglasses, while being suitable for both liquid crystal and organic electroluminescence displays.
Implementation Method 1
a coating type optically anisotropic layer which is disposed on the display surface side of the polarizer
Implementation Method 2
convert incident light into circularly polarized radiation at different angles
Implementation Method 3
a layer of polarizer for polarizing incident light and emitting the polarized light
Implementation Method 4
When the (circularly) polarizing plate and the λ/4 plate are combined, it is possible to secure a 90° directional change of linearly polarized light between the incident ambient light and the reflected light
Data Source
AI summary
The present invention provides a polarizing plate including: a layer of polarizer for polarizing incident light and emitting the polarized light; and a coating type optically anisotropic layer disposed on the side to which the polarized light is emitted from the polarizer layer.