Benzothiophene Liquid Crystal Compound for Display Performance
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Solution Overview
Problem
Current liquid crystal compounds for display devices lack a suitable balance of high stability, high clearing point, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, and excellent compatibility, which limits the performance and lifespan of liquid crystal display devices.
Innovation Solution
A compound represented by formula (1) with specific structural features, including 7-fluoro-benzothiophene, is developed, which provides improved physical properties such as high clearing point, low minimum temperature, small viscosity, and large negative dielectric anisotropy, enhancing compatibility with other liquid crystal compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compounds are used, then device manufacturing is simple, but the compound lacks suitable balance of high stability, high clearing point, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, and excellent compatibility
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific substituents (fluoro-benzothiophene group at position 7, cyano group at position 4, and various alkyl chains) to achieve optimal physical properties including high clearing point, low minimum temperature, small viscosity, and large negative dielectric anisotropy, thereby resolving the contradiction between reliability and structural complexity
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining the newly developed compound (1) with other liquid crystal compounds having different physical properties, allowing the composition to achieve excellent compatibility and balanced performance across multiple parameters including stability, clearing point, minimum temperature, viscosity, optical anisotropy, and dielectric anisotropy
2Temperature
If compound with high clearing point is used, then temperature range is extended, but viscosity may increase
Solution Approach 1:
The patent carefully balances molecular structure parameters by selecting specific alkyl chain lengths (C3-C18) and configurations at positions 2 and 6 of the benzothiophene ring, achieving a clearing point of 80°C or higher while maintaining viscosity at 30 mPa·s or lower, thus extending the temperature range without significantly increasing response time
3Use of energy by moving object
If compound with large negative dielectric anisotropy is used, then threshold voltage is reduced, but compatibility with other compounds may decrease
Solution Approach 1:
The patent develops composite liquid crystal compositions combining compound (1) with other liquid crystal compounds, where compound (1) provides large negative dielectric anisotropy (Δε ≤ -3.0) for low threshold voltage, while the blending with other compounds ensures excellent compatibility and balanced performance, resolving the contradiction between energy efficiency and adaptability
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 wide temperature range, short response time, low threshold voltage, high contrast ratio, and long service life for liquid crystal display devices, addressing the limitations of existing compounds.
Implementation Method 1
The device utilizes optical anisotropy, dielectric anisotropy and so forth of a liquid crystal compound
Implementation Method 2
The device utilizes optical anisotropy, dielectric anisotropy and so forth of a liquid crystal compound
Data Source
AI summary
Provided is a liquid crystal compound that has high stability to heat, light and so forth, a high clearing point, low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition.The compound is represented by formula (1).For example, R1 is alkyl having 1 to 10 carbons, alkoxy having 1 to 9 carbons or alkenyl having 2 to 10 carbons; R2 is alkyl having 1 to 10 carbons, alkoxy having 1 to 9 carbons or alkenyl having 3 to 10 carbons; ring A1 is 1,4-cyclohexylene or 1,4-phenylene; ring A2 is 1,4-cyclohexylene or 1,4-phenylene; Z1 and Z2 are a single bond; Z3 is —O— or a single bond; and L1 is F, CF3 or CF2H.