Liquid Crystal Composition for One-Drop-Fill Stability
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Solution Overview
Problem
Current liquid crystal compositions for display devices face challenges in achieving a positive dielectric anisotropy, wide temperature range, low viscosity, high specific resistance, and stability to heat and light, while also ensuring high-yield production with reduced defective displays due to screen burn-in and droplet stains during the manufacturing process.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by General Formulae (i) and (ii), with optimized mass percentages, that provides improved solubility at low temperatures, high voltage holding ratio, and stability, allowing for stable and continuous dropping during the one-drop-fill technique, thereby enhancing display quality and production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal composition is dropped onto substrate using one-drop-fill technique, then manufacturing process becomes simpler and productivity increases, but droplet stains occur which degrade display quality
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal material by introducing specific compounds with particular molecular structures (containing fluorine atoms and specific ring structures) to alter its physical properties, specifically improving stability during the dropping process to prevent droplet stains while maintaining manufacturing efficiency
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds including those represented by General Formula (I) and General Formula (II), where each component contributes specific properties that collectively prevent droplet stains during one-drop-fill manufacturing while maintaining display quality
2Quantity of substance
If amount of liquid crystal material is reduced for small-size display devices, then device size and power consumption decrease, but control of variation in dropped amount becomes difficult leading to defective display
Solution Approach 1:
The patent changes the viscosity and surface tension parameters of the liquid crystal composition by incorporating specific compounds with fluorine atoms and particular molecular structures, making the material less sensitive to pressure changes and impact during dropping, thereby enabling precise control of small amounts of liquid crystal material in small-size display devices
3Use of energy by moving object
If liquid crystal composition has large dielectric anisotropy for low driving voltage, then power consumption decreases, but viscosity increases which slows response speed
Solution Approach 1:
The patent formulates a composite liquid crystal composition combining compounds with different molecular characteristics - those providing high dielectric anisotropy (containing fluorine atoms) and those maintaining low viscosity (specific ring structures with particular alkyl groups), achieving both low driving voltage and fast response speed through synergistic interaction of components
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 improved solubility, high voltage holding ratio, and stability, enabling high-yield production of liquid crystal display devices with reduced defective displays and enhanced performance in IPS and FFS types.
Implementation Method 1
a liquid crystal composition which has a positive dielectric anisotropy (Δε)
Data Source
AI summary
There is provided a liquid crystal composition containing a compound represented by Formula (i) and a compound represented by General Formula (ii) (where Rii1 and Rii2 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, or an alkenyl group having 4 or 5 carbon atoms; and Xii1 and Xii2 each independently represent a hydrogen atom or a fluorine atom). There is also provided a liquid crystal display device in which such a liquid crystal composition is used.