Liquid Crystal Composition Suppressing Dropping Marks
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Solution Overview
Problem
Liquid crystal display elements face issues with dropping marks during the ODF method, leading to decreased display quality, and existing solutions fail to adequately suppress burn-in and dropping marks while maintaining optimal physical properties.
Innovation Solution
A liquid crystal composition with specific compounds at defined mixing ratios, including those represented by Formulas (I) and (II), is used to suppress dropping marks and enhance the high-speed response and voltage holding ratio, thereby improving the stability and performance of liquid crystal display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ODF (One Drop Fill) method is used to inject liquid crystal composition into large-size substrates, then productivity and ease of manufacture are improved, but dropping marks are generated that decrease display quality
Solution Approach 1:
The patent changes the chemical parameters of the liquid crystal composition by introducing specific compounds with particular molecular structures (cyclic carbonate structures, specific ester groups) and controlling their proportions. This modifies the composition's chemical properties to prevent dropping mark formation while maintaining the ODF injection method's productivity benefits.
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with specific functional groups (cyclic carbonate, ester, alkyl chains) in defined proportions. This composite structure leverages the synergistic effects of different molecular components to eliminate dropping marks while preserving the advantages of the ODF filling method.
2Ease of operation
If monomer is added to the liquid crystal composition for PSA (polymer sustained alignment) and PS (polymer stabilized) display elements, then pretilt angle production and high-speed response property are improved, but foreign materials induce dropping marks that deteriorate yield
Solution Approach 1:
The patent modifies the chemical parameters of the liquid crystal composition by incorporating specific cyclic carbonate compounds and ester-containing compounds in controlled proportions. This changes the composition's reactivity and polymerization characteristics, enabling pretilt angle formation while preventing dropping mark generation that would reduce yield.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups (cyclic carbonate structures) that provide localized polymerization capability for pretilt angle formation, while the overall composition maintains properties that prevent dropping marks. The specific molecular structures provide localized functionality without compromising global composition stability.
3Reliability
If compounds with ester bonds are used in liquid crystal composition for active matrix, then voltage holding ratio is improved, but compound selection is limited which affects manufacturing flexibility
Solution Approach 1:
The patent creates a composite composition combining multiple ester-containing compounds with different molecular structures (cyclic carbonate, linear chains, branched structures) in specific proportions. This composite approach provides the necessary voltage holding ratio while expanding manufacturing flexibility through varied compound selection within the defined compositional framework.
Solution Approach 2:
The patent achieves universality by designing a liquid crystal composition framework that can accommodate multiple different ester-containing compounds (cyclic carbonates, linear esters, branched esters) while maintaining consistent performance. The defined compositional ranges allow substitution of different compounds without compromising voltage holding ratio, thus providing manufacturing flexibility.
Data Source
AI summary
An object of the present invention is to provide a liquid crystal composition in which various characteristics of a liquid crystal display element such as a dielectric anisotropy, a viscosity, a nematic phase upper limit temperature, and γ1, and a burn-in characteristic of a display element are not deteriorated, dropping mark is unlikely to be generated during preparation, a compound represented by liquid crystal composition Formula (I) suitable for a liquid crystal display element in which a discharging amount of the liquid crystal material stable in an ODF step is realized is contained, and a compound represented by General Formula (II) is contained by equal to or more than 15%, and a liquid crystal display element using the same.