Copolymer Alignment Agent for LCD Voltage Holding and Afterimage Reduction
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving uniform brightness and high contrast ratios due to limitations in liquid crystal alignment agents, which affect both alignment properties and electrical properties such as afterimages and voltage holding ratios, especially under high temperatures and mechanical stress.
Innovation Solution
A copolymer is developed incorporating specific repeating units derived from imide-containing diamine and nitrogen atom-containing diamine compounds, allowing for improved liquid crystal alignment and electrical properties without the need for high-temperature heat treatments, enabling efficient light irradiation and enhanced alignment stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal alignment agents (polyimide, polyamide, polyester) are used, then basic alignment properties are achieved, but electrical properties (afterimage, voltage holding ratio) deteriorate under high temperature and mechanical stress
Solution Approach 1:
The patent modifies the chemical structure of the alignment agent by introducing specific functional groups (sulfone, carbonyl, ether linkages) and controlling molecular weight and composition ratios to simultaneously improve electrical properties and alignment performance under high temperature conditions
Solution Approach 2:
The invention uses a composite polymer structure combining multiple functional units (imide rings, sulfone groups, aromatic hydrocarbons) within a single alignment agent molecule to achieve both excellent alignment properties and electrical stability
2Manufacturing precision
If monomer structure or composition is changed to improve physical/chemical properties, then alignment properties are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent divides the polymer structure into distinct functional segments (imide units, sulfone units, aromatic units) with specific repeating patterns, allowing independent optimization of each segment's function while maintaining overall manufacturing feasibility
Solution Approach 2:
The invention introduces specific functional groups at particular positions within the polymer chain (e.g., sulfone groups at regular intervals, specific aromatic hydrocarbon structures) to provide localized alignment enhancement without complicating the entire polymer structure
3Stability of the object's composition
If high-temperature heat treatment is applied to improve alignment, then alignment stability is enhanced, but energy consumption and processing time increase
Solution Approach 1:
The patent replaces the mechanical/thermal alignment method (high-temperature heat treatment) with a chemical alignment mechanism inherent in the polymer structure, where the molecular architecture itself provides alignment guidance without requiring extreme thermal energy input
Solution Approach 2:
The alignment agent's molecular structure contains built-in alignment-promoting features (rigid aromatic cores, directional functional groups) that automatically organize liquid crystal molecules through molecular interactions, eliminating the need for external high-temperature processing
Data Source
AI summary
A polymer having excellent liquid crystal alignment and electrical properties and thus is suitable for use as a liquid crystal alignment agent, a liquid crystal alignment agent including the same, a liquid crystal alignment film formed from the liquid crystal alignment agent, and a liquid crystal display device including the liquid crystal alignment film are provided.