Liquid Crystal Composition for One Drop Fill Defect Reduction
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Solution Overview
Problem
Liquid crystal compositions for display elements face challenges with high viscosity, limited temperature range, sensitivity to external stimuli, and display defects due to drop marks and pressure changes during the One Drop Fill method, particularly in large substrates and small smartphone displays.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by general formulas (i) and (ii), which provide positive anisotropy of dielectric constant, low viscosity, high solubility, and improved voltage holding ratio, reducing display defects and enhancing manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal composition is used in One Drop Fill method for large substrates, then manufacturing scalability is improved, but drop marks and display defects occur due to pressure changes and impacts
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal mixture by incorporating specific compounds (formulae A-1 to A-3 and B) with particular molecular structures and ratios, changing the material's physical properties to reduce sensitivity to pressure changes and eliminate drop marks during the One Drop Fill process
Solution Approach 2:
The patent converts the harmful effects of pressure changes and impacts during dropping into beneficial outcomes by formulating the liquid crystal composition to be insensitive to these disturbances, allowing the One Drop Fill method to produce high-quality displays without defects
2Reliability
If liquid crystal composition has high viscosity to improve voltage holding ratio, then electrical performance is improved, but response speed decreases and manufacturing becomes difficult
Solution Approach 1:
The patent optimizes the viscosity parameter by selecting specific liquid crystal compounds with appropriate molecular structures and combining them in precise ratios, achieving a balance where viscosity is high enough for good voltage holding but low enough for fast response and easy manufacturing
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds (formulae A-1 to A-3 and B) with different properties, where the synergistic effect achieves both high voltage holding ratio and fast response speed simultaneously
3Manufacturing precision
If liquid crystal composition is optimized for small smartphone displays, then display quality is improved, but consistency across extended periods and pressure changes deteriorates
Solution Approach 1:
The patent adjusts the composition parameters to include specific compounds that confer insensitivity to pressure changes and external stimuli, ensuring that small displays maintain consistent performance over extended periods despite manufacturing variations and environmental factors
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 ensures consistent dropability and high-quality display performance across various substrate sizes by maintaining low viscosity and high solubility, while reducing defects and improving temperature stability and response speed.
Implementation Method 1
a liquid crystal composition having positive anisotropy of dielectric constant (Δ∈)
Implementation Method 2
have a liquid crystal phase in as wide a temperature range as possible around room temperature, have low viscosity, and have a low driving voltage. A liquid crystal composition is composed of several to tens of compounds so as to achieve optimum anisotropy of dielectric constant (Δ∈) or optimum anisotropy of reflective index (Δn) of each display element.
Implementation Method 3
have a liquid crystal phase in as wide a temperature range as possible around room temperature
Data Source
AI summary
It is an object of the present invention to provide a liquid crystal composition having positive Δ∈, having a liquid crystal phase in a wide temperature range, having high solubility at low temperatures, having high ODF process compatibility, having a high specific resistance and voltage holding ratio, and being insensitive to heat and light. In order to achieve this object, there is provided a liquid crystal composition containing at least one compound represented by the following general formula (i) and at least one compound represented by the following general formula (ii).(wherein Ri1 denotes an alkyl group having 2 to 5 carbon atoms)(wherein Rii1 and Rii2 independently denote an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and Xii1 and Xii2 independently denote a hydrogen atom or a fluorine atom)