Dichroic Dye Coloring Composition for Light Absorption Anisotropic Film
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Solution Overview
Problem
Existing light absorption anisotropic films with dichroic dye compounds suffer from reduced dichroic ratios due to high compatibility between the dichroic dye and liquid crystalline compounds, leading to inadequate alignment and performance.
Innovation Solution
A coloring composition containing a dichroic dye compound with a Hansen solubility parameter of 17.5 or greater and a specific structure, combined with a liquid crystalline compound, promotes a good compatible state for micro-phase separation, enhancing the dichroic ratio of the light absorption anisotropic film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dichroic dye compound with high compatibility with liquid crystalline compound is used, then the alignment degree is improved, but the dichroic ratio deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the Hansen solubility parameter of the dichroic dye compound to be within a specific range (15-25) and limiting its mass content to 5-50 mass%. These parameter adjustments optimize the balance between compatibility (for alignment) and phase separation (for dichroic ratio), resolving the technical contradiction.
Solution Approach 2:
The patent uses a composite material system consisting of a dichroic dye compound with specific molecular structure (containing aromatic rings and heteroatoms) combined with a liquid crystalline compound. This composite approach allows the system to achieve both good alignment through compatibility and high dichroic ratio through controlled micro-phase separation.
2Reliability
If the mass content of dichroic dye compound is increased to improve dichroic ratio, then the dichroic ratio is improved, but the alignment degree deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal mass content range of 5-50 mass% for the dichroic dye compound. This parameter control ensures sufficient dichroic dye concentration for high dichroic ratio while maintaining enough liquid crystalline compound for proper alignment, preventing both extremes.
3Stability of the object's composition
If a dichroic dye compound with low Hansen solubility parameter is used, then the compatibility is improved, but the micro-phase separation is reduced
Solution Approach 1:
The patent applies parameter changes by specifying the Hansen solubility parameter should be within 15-25, which is neither too low (for excessive compatibility) nor too high (for insufficient compatibility). This optimized parameter range enables appropriate micro-phase separation while maintaining sufficient compatibility for alignment.
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 solution results in a light absorption anisotropic film with an improved dichroic ratio, achieved through the use of a dichroic dye compound with a thienothiazole group and a liquid crystalline compound, ensuring high alignment and enhanced performance.
Implementation Method 1
a device which is operated by a different principle for each function has been used... in liquid crystal displays (LCDs), a linearly polarizing plate or a circularly polarizing plate is used to control optical activity or a birefringent property
Implementation Method 2
a linearly polarizing plate or a circularly polarizing plate is used to control optical activity or a birefringent property in display
Implementation Method 3
promotes a good compatible state for micro-phase separation, enhancing the dichroic ratio of the light absorption anisotropic film
Data Source
AI summary
An object of the invention is to provide a coloring composition which can form a light absorption anisotropic film having an excellent dichroic ratio, a dichroic dye compound, a light absorption anisotropic film, a laminate, and an image display device. A coloring composition according to the invention contains a dichroic dye compound which has a Hansen solubility parameter of 17.5 or greater and has a structure represented by Formula (1), and a liquid crystalline compound.L1-A1-N═N-A2-N═N-A3-L2 (1)in Formula (1), A1, A2, and A3 each independently represent a divalent aromatic group which may have a substituent. Any one of A1, A2, and A3 represents a divalent thienothiazole group which may have a substituent. In Formula (1), L1 and L2 each independently represent a substituent.