Photoreactive Compounds for Liquid Crystal Alignment
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Solution Overview
Problem
Current photoalignment materials for liquid crystals lack effective economic manufacturing processes that also provide good optical or electro-optical properties, limiting their application in various devices such as LCDs, decorative, and security applications.
Innovation Solution
A photoreactive compound with a terminal group of formula (I) is developed, featuring a polymerizable group and spacer units, which allows for efficient alignment of liquid crystals through photoalignment processes, enhancing optical and electro-optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photoalignment materials are used, then manufacturing processes can be implemented, but the optical and electro-optical properties are insufficient
Solution Approach 1:
The patent employs composite materials by combining photoreactive groups (such as cinnamyl, coumarin, or benzoxazole groups) with liquid crystal alignment functionalities in a single molecular structure. This composite approach allows the material to simultaneously provide photoalignment capability and excellent optical/electro-optical properties, resolving the contradiction between manufacturing ease and performance quality.
Solution Approach 2:
The patent modifies molecular parameters by introducing specific photoreactive groups with defined chemical structures and photochemical properties. By changing parameters such as the type of photoreactive group, molecular weight, and structural configuration, the material achieves both high-yield photoalignment processes and superior optical/electro-optical characteristics.
2Reliability
If photoalignment materials are designed for good optical properties, then manufacturing costs increase
Solution Approach 1:
The patent creates multi-functional photoreactive compounds that serve multiple purposes: they provide photoalignment functionality, ensure good optical properties, and maintain cost-effectiveness. The universal design allows a single compound structure to achieve economic manufacturing through high-yield synthesis while delivering the required optical performance for liquid crystal alignment.
3Reliability
If photoalignment materials are designed for good electro-optical properties, then manufacturing complexity increases
Solution Approach 1:
The patent segments the molecular structure into distinct functional units: a photoreactive group (such as cinnamyl, coumarin, or benzoxazole) and a liquid crystal alignment group. This segmentation allows each component to be optimized independently for its specific function while maintaining overall structural simplicity that facilitates economic manufacturing and high-yield production.
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 compound enables high-yield, cost-effective photoalignment processes, improving the optical and electro-optical properties of liquid crystal devices, expanding their applications in displays, security, and decorative fields.
Implementation Method 1
The wording 'polymerizable group' as used in the context of the present invention refers to a functional group that can be subjected to polymerization (optionally with other comonomers) to yield an oligomer, dendrimer or polymer
Data Source
AI summary
The present invention relates to photoreactive compounds that are particularly useful in materials for the alignment of liquid crystals.