Liquid Crystal Composition for ODF Drip Trace Reduction
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Solution Overview
Problem
Liquid crystal display elements face challenges with deteriorated display quality due to drip traces and difficulty in controlling the quantity of liquid crystal composition, especially in small-sized devices like smartphones, which affects production yield and is influenced by pressure changes during the manufacturing process.
Innovation Solution
A liquid crystal composition with a positive dielectric constant anisotropy value, combining specific alkyl and alkenyl groups, is developed to enhance solubility, viscosity, and stability, allowing for high-speed response and reduced defectiveness, suitable for IPS and FFS modes, and is designed to maintain performance across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid crystal composition is dropped using the ODF method, then the manufacturing process is simplified, but display quality deteriorates due to drip traces and difficulty in controlling liquid crystal quantity
Solution Approach 1:
The patent modifies the physical and chemical parameters of the liquid crystal composition, specifically adding compounds with fluorine atoms at the terminal positions of alkyl chains (formula 1) and compounds with specific cyclic structures (formula 2). These compositional parameter changes reduce surface tension and improve wetting properties, allowing the liquid crystal to be dropped more precisely with reduced drip traces while maintaining quantity control in the ODF method
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple components: liquid crystal compounds with positive dielectric anisotropy (formula 3), compounds with fluorine-terminal alkyl chains (formula 1), compounds with cyclic structures (formula 2), and compounds with alkenyl groups (formula 4). This composite formulation achieves both ease of manufacture through ODF and precise quantity control by optimizing the synergistic effects of different components
2Speed
If the liquid crystal composition is optimized for high-speed response, then response time improves, but viscosity control becomes more difficult
Solution Approach 1:
The patent adjusts the viscosity parameter by incorporating compounds with fluorine-terminal alkyl chains (formula 1) and specific cyclic structures (formula 2) into the liquid crystal composition. These compounds modify the intermolecular forces and molecular packing, enabling viscosity to be controlled within an optimal range that supports high-speed response while maintaining manufacturability
Solution Approach 2:
The patent introduces compounds with localized functional groups - fluorine atoms at terminal positions (formula 1) and specific cyclic structures (formula 2) - that locally modify the liquid crystal's rheological properties. This local quality enhancement allows the bulk composition to maintain high-speed response characteristics while achieving controlled viscosity through the localized action of these specialized compounds
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 composition achieves high-speed response, improved stability under heat and light, and reduced defectiveness, ensuring high production yield and excellent display quality while being less affected by pressure changes, thus addressing the issues of drip traces and quantity control.
Implementation Method 1
a liquid crystal composition having a positive value of Δ∈... when applying horizontal electric field, it can display
Data Source
AI summary
There is provided a liquid crystal composition comprising: at least one kind of a compound represented by the following formula (i); and at least one kind of a compound represented by the following formula (ii). In the formulae, each of Ri1, Ri2 and Rii1 independently represents an alkyl group having a carbon number of 1-8; one of the alkyl groups, or two or more of the alkyl groups being noncontiguous, include —CH2— which can be independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—; hydrogen atom in the alkyl group can be substituted by fluorine atom or chlorine atom; and each of Xi1, Xi2, Xi3 and Xi4 independently represents hydrogen atom or fluorine atom.