Polarizing Element Refractive Index Optimization for Antireflection
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Solution Overview
Problem
Existing circularly polarizing plates used in flexible OLEDs face challenges in achieving high polarization and flexibility while maintaining an excellent antireflection function, as increasing the concentration of dichroic substances in anisotropic light-absorbing films enhances polarization but reduces antireflection efficiency.
Innovation Solution
A polarizing element comprising an alignment film and an anisotropic light-absorbing film with a degree of alignment of 0.92 or more and an average refractive index between 1.55 to 2.0, along with specific refractive index anisotropy and thickness parameters, is developed to enhance antireflection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the concentration of dichroic substance in the anisotropic light-absorbing film is increased to achieve high degree of polarization, then the polarization performance is improved, but the antireflection function is lowered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average refractive index of the alignment film within the range of 1.55 to 2.0 and the degree of alignment of the anisotropic light-absorbing film at 0.92 or more. This optimization of physical parameters enables the system to achieve both high polarization (25% or more) and excellent antireflection function, resolving the contradiction between polarization performance and reflection control
Solution Approach 2:
The patent employs composite materials by combining the alignment film with specific refractive index characteristics and the anisotropic light-absorbing film containing dichroic substances. This composite structure allows the alignment film to provide antireflection functionality while the anisotropic light-absorbing film provides polarization, thereby resolving the contradiction between these two functions
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 polarizing element with improved antireflection functionality for image display devices, maintaining high polarization and flexibility by optimizing the refractive index and alignment of the anisotropic light-absorbing film.
Implementation Method 1
an anisotropic light-absorbing film formed using a dichroic substance, in which a degree S of alignment of the anisotropic light-absorbing film is 0.92 or more
Implementation Method 2
a dichroic substance is applied onto a substrate such as glass and a transparent film and aligned using an intermolecular action or the like
Data Source
AI summary
Provided is a polarizing element which has an excellent antireflection function as being applied to an image display device; and a circularly polarizing plate and an image display device, each of which has the polarizing element. The polarizing element has an alignment film and an anisotropic light-absorbing film formed using a dichroic substance, in which a degree S of alignment of the anisotropic light-absorbing film is 0.92 or more, and an average refractive index nave at a wavelength of 400 to 700 nm of the alignment film is 1.55 to 2.0.