Polarizing Plate Retardation Layer Wavelength Adaptability
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Solution Overview
Problem
Conventional polarizing plates with ½ or ¼ wavelength retardation films operate within a limited range of wavelengths, failing to effectively manage reflection and visibility across a broad spectrum, especially at inclined angles.
Innovation Solution
A polarizing plate comprising a polarizer and a retardation layer, which can be uniaxial or biaxial, with specific refractive index characteristics and thickness-direction retardation, is designed to provide a wide-range wavelength retardation characteristic, enhancing reflection and visibility at inclined angles by controlling in-plane and thickness-direction retardation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional ½ or ¼ wavelength retardation film is used, then the polarizing plate can prevent reflection and ensure visibility, but it operates only within a limited range of wavelengths and fails to effectively manage reflection and visibility across a broad spectrum
Solution Approach 1:
The retardation layer is divided into multiple sub-layers with different retardation characteristics (first, second, and third sub-layers with different thickness-direction retardations). This segmentation allows each sub-layer to handle specific wavelength ranges, collectively achieving broad-spectrum performance while maintaining reliability across all wavelengths.
Solution Approach 2:
The patent uses a composite retardation layer structure combining multiple materials with different optical properties. The first retardation film (positive uniaxial), second retardation film (negative uniaxial), and third retardation film (biaxial) are复合ed to create a system that achieves wide wavelength adaptability while maintaining consistent reflection and visibility performance.
2Reliability
If a single-type retardation film is used, then the structure is simple, but it cannot provide wide-range wavelength retardation characteristics and fails to reduce reflectivity to 12% or less at 50 degrees
Solution Approach 1:
Each sub-layer in the retardation layer is designed with specific local optical properties (different thickness-direction retardations and refractive index characteristics). The first sub-layer handles specific wavelength ranges with positive uniaxial characteristics, the second with negative uniaxial characteristics, and the third with biaxial characteristics, achieving localized optimization that collectively reduces reflectivity to 12% or less at 50 degrees.
Solution Approach 2:
The patent transitions from considering only in-plane retardation to incorporating thickness-direction retardation as an additional design dimension. By controlling both in-plane and thickness-direction retardation parameters across multiple sub-layers, the system achieves superior reflection control at inclined angles while managing the increased structural complexity through systematic parameter optimization.
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 achieves excellent reflection and visibility across a wide range of wavelengths and at inclined angles, with reflectivity reduced to 12% or less at 50 degrees, effectively addressing the limitations of prior art by ensuring optimal performance in liquid crystal displays and organic light emitting devices.
Implementation Method 1
a retardation layer (102), which may have a uniaxial or biaxial structure, on one surface of the polarizer (101)
Implementation Method 2
a polarizer and a retardation layer. The retardation layer may be stacked on one side of the polarizer
Data Source
AI summary
Provided are a polarizing plate and a display. The illustrative polarizing plate may exhibit desired characteristics in a wide range of wavelengths, and have excellent reflection and visibility at an inclined angle. For example, the polarizing plate may be used in a reflective or transflective liquid crystal display or an organic light emitting device.