Liquid Crystal Composition for Dropping Marks and Alignment Stability
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Solution Overview
Problem
Liquid crystal compositions for display devices face challenges in maintaining high yield and display quality due to issues like image sticking, dropping marks, and defects, particularly in large substrate sizes and smart phone applications, requiring a composition with positive dielectric anisotropy, wide temperature range, low viscosity, and stability to heat and light.
Innovation Solution
A liquid crystal composition combining specific compounds represented by general formulas (i) and (ii), which include alkyl groups, fluorine atoms, and phenylene groups, to achieve positive dielectric anisotropy, low viscosity, and stability, allowing for stable performance and reduced manufacturing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid crystal composition is dropped on a substrate using the one drop fill (ODF) method, then manufacturing efficiency is improved, but display quality degrades due to dropping marks and defects
Solution Approach 1:
The patent changes the physical and chemical parameters of the liquid crystal composition by incorporating specific compounds with fluorine atoms and cyclohexane rings, which modify the composition's response to pressure changes and impact during the dropping process, thereby reducing dropping marks while maintaining manufacturing efficiency
Solution Approach 2:
The patent uses a composite liquid crystal composition containing multiple specific compounds (including those with fluorine atoms, cyclohexane rings, and various functional groups) that work together to provide both the desired display characteristics and resistance to dropping defects, achieving high yield without compromising display quality
2Quantity of substance
If the amount of liquid crystal filling is increased to ensure adequate coverage, then display coverage is improved, but display defects occur due to imbalance between refractive index and driving electric field
Solution Approach 1:
The patent adjusts the refractive index and other physical parameters of the liquid crystal composition by selecting specific compounds with appropriate molecular structures, enabling the composition to maintain optimal display performance across a range of filling amounts and reducing sensitivity to filling variations
3Stability of the object's composition
If liquid crystal compounds with positive Δ∈ are used to achieve horizontal alignment, then alignment mode is improved, but viscosity increases reducing response speed
Solution Approach 1:
The patent combines multiple liquid crystal compounds with positive dielectric anisotropy in specific ratios, where the synergistic interaction between different compounds maintains strong horizontal alignment stability while the overall composition viscosity remains low for fast response
Solution Approach 2:
The patent introduces compounds with specific local molecular structures (such as fluorine-substituted compounds and cyclohexane-containing compounds) that locally enhance alignment stability without significantly increasing the overall viscosity of the composition
4Area of stationary object
If liquid crystal composition is used for large substrate sizes, then application range is improved, but dropping control becomes difficult leading to display defects
Solution Approach 1:
The patent modifies the viscosity and surface tension parameters of the liquid crystal composition by selecting specific compounds, improving the composition's flow characteristics and drop formation behavior, which enables better controlling of large-volume drops for large substrates while reducing satellite drop formation
Data Source
AI summary
There is provided a liquid crystal composition containing any one or two or more of compounds represented by general formula (i) below and any one or two or more of compounds represented by general formula (ii) below.