Liquid Crystal Alignment Agent Polymer Composition for High Voltage Holding Ratio
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Solution Overview
Problem
Conventional vertical liquid crystal alignment films fail to achieve superior reliability and high voltage holding ratio, which are essential for large-sized liquid crystal display devices.
Innovation Solution
A liquid crystal alignment agent is developed by subjecting a diamine composition and a tetracarboxylic dianhydride compound to a polymerization reaction, forming a polymer that is dissolved in a solvent to create a liquid crystal alignment film with improved alignment properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vertical liquid crystal alignment films are used, then the liquid crystal display element can be manufactured, but the voltage holding ratio and reliability are insufficient for large-sized display devices
Solution Approach 1:
The patent modifies the chemical composition parameters of the alignment film by incorporating specific diamine compounds (formulas I-1 to I-5) with defined molecular structures and ratios. This chemical parameter change improves the voltage holding ratio while maintaining compatibility with large-sized display devices
Solution Approach 2:
The alignment film is formulated as a composite material containing multiple diamine compounds (first diamine compound of formula I-1, second diamine compounds of formulas I-2 to I-5) in specific ratio ranges. This composite structure combines the benefits of different molecular components to achieve both high voltage holding ratio and reliability for large-sized applications
2Reliability
If conventional alignment films are used, then manufacturing is simple, but alignment properties and voltage holding ratio are insufficient
Solution Approach 1:
The patent specifies precise compositional parameters including the ratio of first diamine compound to second diamine compounds (20:80 to 80:20 by mass) and molecular structure parameters (formulas I-1 to I-5). These controlled parameter changes improve alignment properties while keeping the formulation process manageable through defined ratios and ranges
3Reliability
If conventional alignment agents are used, then the formulation process is straightforward, but the voltage holding ratio cannot be improved
Solution Approach 1:
The patent introduces specific chemical composition parameters (diamine compound ratios, molecular structures) that improve voltage holding ratio. The formulation remains manufacturable by controlling these parameters within defined ranges, balancing performance improvement with manufacturing feasibility
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 solution enhances the voltage holding ratio and reliability of liquid crystal display elements, addressing the limitations of conventional films and meeting the requirements for large-sized display devices.
Implementation Method 1
The polymer is obtained by subjecting a diamine composition and a tetracarboxylic dianhydride compound to a polymerization reaction
Implementation Method 2
a solvent for dissolving the polymer
Data Source
AI summary
A liquid crystal alignment agent includes a polymer and an organic solvent for dissolving the polymer. The polymer is obtained by subjecting a diamine composition and a tetracarboxylic dianhydride compound to a polymerization reaction. The diamine composition includes a first diamine compound, a second diamine compound, and a third diamine compound as defined in the specification.A liquid crystal alignment film formed from the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.