Photoaligning Polymer Materials for Liquid Crystal Orientation
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Solution Overview
Problem
There is a need for advanced photoaligning polymer materials that enable efficient liquid crystal orientation with improved optical properties, compatibility with various solvents, and flexibility in manufacturing processes, particularly for roll-to-roll processes, while requiring less energy and offering superior adhesion to different substrates.
Innovation Solution
The development of novel photoaligning polymer materials with specific repeating structural units, allowing for high compatibility with solvents and substrates, and the use of these materials in orientation layers for liquid crystals, which can be applied at room temperature and used in multi-layer systems for optical and electro-optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional photoaligning polymer materials are used, then liquid crystal orientation can be achieved, but energy consumption is high and manufacturing efficiency is reduced
Solution Approach 1:
The patent modifies the chemical structure of photoaligning polymer materials by introducing specific repeating units with formulas (I) and (II), containing photoaligning groups such as cinnamates, chalcones, coumarins, quinolones, stilbenes, cyanostilbenes, azo groups, chromones, chromenes, mono- and di-acetylene groups, and benzylidenephtalimide groups. These structural parameter changes enable the materials to achieve effective liquid crystal orientation at lower energy levels while maintaining or improving manufacturing efficiency
Solution Approach 2:
The patent employs composite photoaligning polymer materials comprising multiple types of repeating structural units with different functions. The copolymer structure combines photoaligning units with spacer units and hydrophobic/hydrophilic balance units, creating a composite material that optimizes both energy efficiency and manufacturing performance through synergistic effects of different molecular components
2Manufacturing precision
If advanced photoaligning materials are developed for efficient manufacturing, then manufacturing precision and optical properties improve, but material complexity increases
Solution Approach 1:
The patent segments the photoaligning polymer material into distinct functional repeating units: photoaligning groups (formulas I and II), spacer units (S1, S1′) with specific structures, and hydrophobic/hydrophilic balance units. Each segment performs a specific function, allowing the complex material to be designed and optimized systematically while maintaining overall performance
Solution Approach 2:
The repeating structural units in the patent are designed to perform multiple functions simultaneously: photoalignment, spacing, and hydrophobic/hydrophilic balance. This multi-functionality reduces the need for separate additive components, simplifying the overall material system while achieving high manufacturing precision and optical properties
3Ease of operation
If photoaligning materials are applied at elevated temperatures, then coating process flexibility improves, but temperature-sensitive substrates are damaged
Solution Approach 1:
The photoaligning polymer materials in the patent are designed with inherent properties that enable them to be applied at room temperature without requiring external heating. The materials self-adjust their viscosity and coating characteristics at ambient conditions, eliminating the need for thermal processing and protecting temperature-sensitive substrates from damage
4Adaptability or versatility
If photoaligning materials with high solvent compatibility are used, then coating method flexibility improves, but adhesion to certain substrates may be compromised
Solution Approach 1:
The patent introduces local hydrophobic and hydrophilic regions within the polymer chains through specific repeating units. This local quality variation allows the material to interact with different solvents and substrates selectively, maintaining high solvent compatibility while ensuring strong adhesion to diverse substrates through localized molecular interactions
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
These materials provide excellent liquid crystal orientation, maintain good optical contrast, and allow for efficient manufacturing processes, including roll-to-roll processes, with reduced energy consumption and enhanced adhesion, enabling a wide range of applications in optical and electro-optical elements.
Implementation Method 1
irradiating the photoaligning polymer material with UV light
Implementation Method 2
The photoaligning polymer materials according to the present invention are very well suited for roll-to-roll processes
Data Source
AI summary
The present invention relates to novel photoaligning polymer materials, to their use as orienting layer for liquid crystals, which are used for the production of non-structured and structured optical elements, electro-optical elements, multi-layer systems or in nanoelectronics.