Liquid Crystal Composition with Polymerizable Compound for Voltage Holding Ratio
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Solution Overview
Problem
Liquid crystal compositions containing alkenyl liquid crystal compounds are prone to degradation by light and actinic rays, leading to impurities that affect the voltage holding ratio (VHR) of liquid crystal panels.
Innovation Solution
A liquid crystal composition incorporating a compound with polymerizable groups and polar groups, which captures impurities and immobilizes them within a polymer, maintaining the VHR by preventing their dispersion throughout the composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a liquid crystal composition containing an alkenyl liquid crystal compound is used to accelerate response time, then the response time is reduced, but the composition is easily degraded by light and actinic rays, leading to impurities that affect voltage holding ratio
Solution Approach 1:
A polymerizable compound is introduced as an intermediary substance that captures photodegradation impurities through chemical reactions. This mediator prevents impurities from directly affecting the liquid crystal molecules, thereby maintaining voltage holding ratio while allowing the use of alkenyl compounds for fast response
Solution Approach 2:
The harmful photodegradation process is converted into a beneficial effect by designing the polymerizable compound to specifically react with degradation products. The impurities generated by light exposure are transformed into harmless polymer-bound species, turning a detrimental process into a protective mechanism
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 effectively enhances the voltage holding ratio by immobilizing impurities, ensuring the stability and reliability of liquid crystal display elements.
Implementation Method 1
monomers dissolved in the liquid crystal are polymerized to impart the desired pretilt angle
Data Source
AI summary
A compound that helps achieve a high voltage holding ratio (VHR) of a liquid crystal composition, a liquid crystal composition that contains this compound, and a liquid crystal display element made with this liquid crystal composition. More specifically, a compound represented by general formula (Y), which has polymerizable groups and polar group(s). A liquid crystal composition containing one or two or more compounds represented by general formula (Y), each of which has polymerizable groups and polar group(s). A liquid crystal display element made with a liquid crystal composition that contains one or two or more compounds represented by general formula (Y), each of which has polymerizable groups and polar group(s).