Liquid Crystal Composition for Low-Temperature Stability
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Solution Overview
Problem
Liquid crystal compositions used in display devices face issues with low-temperature storage stability and volatility due to the evaporation of bicyclohexyl-(benzene) compounds, which affect their performance in maintaining a nematic phase at low temperatures.
Innovation Solution
A liquid crystal composition is developed containing specific compounds represented by general formulas (1) and (2), which balance molecular symmetry and solubility to improve low-temperature storage properties and reduce volatility, comprising a first component with alkyl groups at the termini and a second component with a symmetrical benzene ring structure, along with optional additional components to enhance solubility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bicyclohexyl-(benzene) compounds with alkyl groups are used to eliminate image ghosting, then image fixing problem is resolved, but low-temperature storage stability deteriorates due to evaporation
Solution Approach 1:
The patent uses a composite liquid crystal composition containing multiple components: bicyclohexyl-(benzene) compounds (for ghosting resistance), cyclohexane carboxylic acid compounds (for low-temperature stability), and fluorinated compounds (for viscosity control). This composite approach allows each component to contribute its strengths while compensating for the weaknesses of individual substances.
Solution Approach 2:
The patent optimizes the molecular structure parameters of the liquid crystal compounds, specifically controlling the carbon atom numbers in alkyl groups (1-15 atoms) and using specific structural formulas (I) and (II) with defined ring structures and substituent positions to achieve both ghosting resistance and low-temperature stability.
2Speed
If bicyclohexyl-(benzene) compounds are used to ensure high-speed response, then response speed is improved, but volatility increases causing performance degradation
Solution Approach 1:
The patent combines bicyclohexyl-(benzene) compounds (providing fast response) with cyclohexane carboxylic acid compounds and fluorinated compounds (reducing volatility). The synergistic effect of this composite system maintains high response speed while suppressing the volatility issue through molecular interactions and balanced composition.
Solution Approach 2:
The patent introduces local structural modifications to the liquid crystal molecules, specifically adding fluorine atoms at specific positions and using cyclohexane carboxylic acid groups, which locally enhance intermolecular forces and reduce volatility without significantly affecting the overall fast-response characteristics of the bicyclohexyl-(benzene) core structure.
Data Source
AI summary
There is provided a liquid crystal display device that uses such a liquid crystal composition is also provided. Provided is a liquid crystal composition that includes a first component which is at least one selected from the group consisting of compounds represented by general formula (1) and a second component which is at least one component selected from the group consisting of compounds represented by general formula (2). Also provided is a liquid crystal display device that uses a liquid crystal composition that contains the first component and the second component.