Asymmetric Pyridine Polymer for Liquid Crystal Alignment
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Solution Overview
Problem
Conventional liquid crystal aligning agents fail to simultaneously achieve excellent liquid crystal alignment properties, durability, and electrical characteristics, particularly in low-power displays, where they can affect image quality and voltage holding ratios.
Innovation Solution
A polymer for liquid crystal aligning agents is developed, incorporating specific repeating units that include a diamine compound with an asymmetric pyridine structure, which enhances liquid crystal alignment and voltage holding ratios, and is used in a composition and film for liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional liquid crystal aligning agents (polyimide, polyamide, polyester) are used, then heat resistance and mechanical strength are improved, but electrical characteristics (voltage holding ratio, after-image) and liquid crystal alignment properties cannot be simultaneously optimized
Solution Approach 1:
The invention changes the chemical structure parameters of the aligning agent by introducing specific repeating units with asymmetric pyridine structures and controlled functional groups. This structural parameter change enables simultaneous optimization of electrical characteristics (voltage holding ratio above 90%) and liquid crystal alignment properties without sacrificing mechanical strength
Solution Approach 2:
The invention creates a composite polymer structure containing multiple specific repeating units (Formula 1, Formula 2, Formula 3) with different functional characteristics. This composite approach combines the heat resistance of polyimide structures with the electrical performance of pyridine-based structures, achieving both mechanical strength and superior electrical characteristics
2Ease of operation
If conventional aligning agents are used in low-power displays, then basic alignment function is achieved, but after-image phenomena and voltage holding ratio deteriorate
Solution Approach 1:
The invention converts the potential harm of DC/AC voltage effects into a benefit by designing polymer structures that actively improve voltage holding ratio above 90%. The specific repeating units with pyridine structures and functional groups work to suppress after-image phenomena while maintaining alignment function, turning voltage-related issues into performance advantages
3Adaptability or versatility
If monomer structure is modified or multiple monomers are combined to improve properties, then structural variety is increased, but remarkable improvement in physical properties has not been achieved
Solution Approach 1:
The invention applies local quality by introducing specific functional groups and asymmetric pyridine structures at particular positions within the polymer chain. Rather than random modification, the repeating units are designed with precise local structural features that collectively achieve superior physical properties including voltage holding ratio and alignment characteristics
Data Source
AI summary
The present invention relates to a polymer which is excellent in terms of liquid crystal alignment property, durability, and electrical characteristics, and thus is suitable for use in a liquid crystal aligning agent, a liquid crystal aligning agent composition including the same, a liquid crystal alignment film formed from the liquid crystal aligning agent composition, and a liquid crystal display device including the liquid crystal alignment film.