Light Absorption Anisotropic Layer Haze Suppression
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Solution Overview
Problem
Existing light absorption anisotropic layers suffer from haze issues due to disorder in the alignment of liquid crystal compounds, which affects their optical properties and performance in applications like image display devices.
Innovation Solution
A light absorption anisotropic layer is developed with a specific X-ray diffraction pattern measurement criterion, using a dichroic substance and liquid crystal compound combination where the peak intensity ratio at different diffraction angles satisfies a specific relationship, and a monofunctional compound is included to maintain molecular alignment, reducing haze and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light absorption anisotropic layer is formed using a polymerizable smectic liquid crystal compound and a dichroic coloring agent, then the polarization function is achieved, but haze occurs and optical clarity deteriorates
Solution Approach 1:
The patent changes the molecular structure parameters of the liquid crystal compound by introducing a rigid cyclic core structure (cyclohexane ring) and specific terminal groups. This structural modification alters the packing behavior and alignment characteristics of the liquid crystal molecules, enabling them to form an oriented structure without haze while maintaining the polarization function. The specific parameter changes in molecular structure lead to improved optical clarity.
Solution Approach 2:
The patent creates a composite system by combining specifically designed liquid crystal compounds with dichroic coloring agents. The liquid crystal compound provides the structural framework and alignment, while the dichroic coloring agent provides the polarization function. This composite approach allows the system to achieve both haze suppression and effective polarization by leveraging the complementary functions of each component.
2Manufacturing precision
If liquid crystal compounds are aligned in the light absorption anisotropic layer, then polarization performance is improved, but alignment disorder occurs leading to haze
Solution Approach 1:
The patent introduces specific local structural features into the liquid crystal compound, including a rigid cyclic core structure and particular terminal groups. These local structural qualities dictate the molecular packing and alignment behavior, creating regions of ordered structure that prevent haze formation while maintaining overall alignment. The local structural design ensures proper molecular orientation without the disorder that causes haze.
3Reliability
If iodine is used as a dichroic substance, then polarization function is achieved, but organic coloring agents are examined as alternatives
Solution Approach 1:
The patent changes the material composition parameters by developing a light absorption anisotropic layer that works effectively with organic coloring agents instead of iodine. The specific liquid crystal compound structure designed in this patent is optimized to work with organic dichroic substances, changing the material compatibility parameters to enable the use of organic coloring agents while maintaining polarization function.
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 effectively suppresses haze and enhances the durability and alignment of the light absorption anisotropic layer, improving its optical performance and stability, particularly in image display devices.
Implementation Method 1
A light absorption anisotropic layer containing a dichroic substance and a liquid crystal compound
Implementation Method 2
a polarizing layer (light absorption anisotropic layer) formed from a composition containing a polymerizable smectic liquid crystal compound and a dichroic coloring agent
Implementation Method 3
in an X-ray diffraction pattern measurement using an in-plane diffraction method, a value of a peak intensity of diffracted X-rays at predetermined positions
Implementation Method 4
diffracted X-rays are measured in a measurement region shown below to determine a diffraction angle 2θmax and a rotation angle φmax
Data Source
AI summary
A light absorption anisotropic layer, manufacturing thereof, a laminate and an image display device. The layer contains a dichroic substance and a liquid crystal compound, in which, when, in an X-ray diffraction pattern measurement using an in-plane diffraction method with X-ray irradiation, diffracted X-rays are measured in a measurement region of a rotation angle φ in in-plane direction of light absorption anisotropic layer: 0° to 180° and a diffraction angle 2θ:0° to 10° to determine a diffraction angle 2θmax and a rotation angle φmax at which a peak intensity is maximized, a peak intensity of diffracted X-rays at the diffraction angle 2θmax and the rotation angle φmax is represented by I(φmax), and a peak intensity of diffracted X-rays at the diffraction angle 2θmax and the rotation angle φmax−10° is represented by I(φmax−10), a relationship expressed by Expression (1) I(φmax)/I(φmax−10)≥1.6 is satisfied.