Fluorinated Liquid Crystal Compound for Wide Temperature Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal compounds fail to achieve a balance of high stability to heat and light, low minimum temperature of the liquid crystal phase, small viscosity, suitable optical and dielectric anisotropy, and excellent compatibility, which are essential for improving the performance of liquid crystal display devices.
Innovation Solution
A liquid crystal compound represented by a specific formula with phenylene rings and fluoroalkyl groups is developed, which provides a negative dielectric anisotropy and improved compatibility, allowing for a composition that enhances the temperature range, response time, and voltage holding ratio of liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compounds are used, then manufacturing and device structure are simple, but the compound cannot achieve a balance of high stability to heat and light, low minimum temperature of the liquid crystal phase, small viscosity, suitable optical and dielectric anisotropy, and excellent compatibility
Solution Approach 1:
The patent changes the chemical structure parameters of the liquid crystal compound by introducing specific molecular configurations with phenylene rings and fluorinated groups. This structural parameter change achieves a balanced combination of multiple physical properties including high stability to heat and light, low minimum temperature of the liquid crystal phase, small viscosity, and suitable optical and dielectric anisotropy, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent develops a composite liquid crystal composition containing multiple compounds including the newly developed compound (1) with specific physical properties. By combining compounds with different characteristics, the composition achieves a balanced profile of stability, temperature range, viscosity, and anisotropy properties that individual compounds cannot achieve alone, thus resolving the contradiction between reliability and adaptability.
2Temperature
If the minimum temperature of the liquid crystal phase is lowered to extend the temperature range, then the temperature range is extended, but the stability to heat and light may be compromised
Solution Approach 1:
The patent modifies the molecular structure parameters by introducing specific phenylene ring configurations and fluorinated terminal groups. These structural changes enable the liquid crystal compound to maintain high stability to heat and light while achieving a low minimum temperature of the liquid crystal phase, thus extending the operational temperature range without compromising reliability.
3Speed
If the viscosity is reduced to decrease the response time, then the response time is decreased, but the dielectric anisotropy and optical anisotropy may be affected
Solution Approach 1:
The patent optimizes molecular structure parameters by selecting specific alkyl chain lengths and fluorinated group configurations. These changes achieve a balanced profile where the compound exhibits small viscosity for fast response time while maintaining suitable optical anisotropy (Δn) and large negative dielectric anisotropy (Δ∈), thus resolving the contradiction between speed and reliability.
4Use of energy by moving object
If the dielectric anisotropy is increased to reduce the threshold voltage, then the threshold voltage is reduced, but the viscosity may increase
Solution Approach 1:
The patent adjusts molecular structure parameters including the introduction of fluorinated terminal groups and specific alkyl chain configurations. These changes enable the compound to exhibit large negative dielectric anisotropy for reduced threshold voltage while maintaining small viscosity for fast response time, thus resolving the contradiction between energy efficiency and speed.
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 compound achieves a balance of physical properties, resulting in a liquid crystal display device with a wide temperature range, short response time, low threshold voltage, high contrast ratio, and long service life.
Implementation Method 1
a liquid crystal compound having one phenylene ring and a negative dielectric anisotropy
Implementation Method 2
a liquid crystal compound having one phenylene ring and a negative dielectric anisotropy
Data Source
AI summary
A solution is a compound represented by formula (1), a liquid crystal composition containing the compound and a liquid crystal display device including the composition.In formula (1), Ra and Rb are independently alkyl having 1 to 30 carbons or the like; and X and Y are independently fluoroalkyl having 1 to 5 carbons, fluoroalkoxy having 1 to 5 carbons or pentafluorosulfanil, and one of X and Y may be fluorine.