Laminate Reducing Reflected Light Coloring via Polarization Control
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Solution Overview
Problem
The use of high transmittance optical films in display panels leads to colored reflections due to light interaction with metal electrodes, as some reflected light is not absorbed by the dichroic substances in the light absorption anisotropic film, causing visibility issues with displayed images.
Innovation Solution
A laminate configuration comprising an optical film with a light absorption anisotropic film, a λ/4 plate, and a metal electrode, where the degree of polarization at specific wavelengths and reflectance of the metal electrode satisfy a predetermined ratio, reducing the coloring of reflected light. This configuration includes a dichroic substance with specific compounds and a content of 25% or less by mass, ensuring high transmittance and effective light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical film with high transmittance is used, then light transmission is improved, but reflected light becomes colored
Solution Approach 1:
The patent applies parameter changes by precisely controlling the degree of polarization P(λ) of the optical film at different wavelengths (450nm, 550nm, 650nm) to satisfy specific mathematical relationships with the reflectance R(λ) of the metal electrode. By adjusting these optical parameters within defined ranges, the invention achieves high transmittance while suppressing colored reflections through wavelength-dependent polarization control
Solution Approach 2:
The invention uses a composite structure consisting of an optical film containing dichroic substances combined with a metal electrode layer. The optical film comprises multiple components including dichroic substances (at 25% or less by mass), polymers, and other additives that work together to achieve the desired optical properties of high transmittance and controlled polarization to eliminate colored reflections
2Object-generated harmful factors
If dichroic substance content is increased to reduce reflected light, then reflection is reduced, but transmittance decreases
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of dichroic substance content to 25% or less by mass, which is optimized to provide sufficient polarization effect to reduce reflected light while maintaining high light transmittance. This specific concentration parameter achieves the balance between reflection suppression and transmission preservation
Solution Approach 2:
The invention applies local quality by making the optical film's polarization property wavelength-dependent, with different degrees of polarization P(λ) at different wavelengths (450nm, 550nm, 650nm). This localized optical property adjustment allows selective control of reflected light at different wavelengths while maintaining overall high transmittance across the visible spectrum
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 proposed laminate significantly reduces the coloring of reflected light, maintaining high transmittance and ensuring clear image display by optimizing the polarization and reflectance ratios, thereby improving visual recognition of patterns on display panels.
Implementation Method 1
an optical film having a light absorption anisotropic film formed using a composition including a dichroic substance
Implementation Method 2
light absorption anisotropic film formed using a composition including a dichroic substance and having a transmittance of more than 50%
Implementation Method 3
a λ/4 plate
Implementation Method 4
a metal electrode in this order, in which in a case where a degree (%) of polarization at a wavelength of λ of the optical film is defined as P(λ) and a reflectance (%) at the wavelength of λ of the metal electrode is defined as R(λ)
Data Source
AI summary
An object of the present invention is to provide a laminate in which the coloring of reflected light is reduced. The laminate includes an optical film having a light absorption anisotropic film formed using a composition including a dichroic substance and having a transmittance of more than 50%, a λ/4 plate, and a metal electrode in this order, in which in a case where a degree (%) of polarization at a wavelength of λ of the optical film is defined as P(λ) and a reflectance (%) at the wavelength of λ of the metal electrode is defined as R(λ), a ratio of a minimum value of R/P to a maximum value of R/P at wavelengths of 450 nm, 550 nm, and 650 nm is more than 85%.