Fluorine-Substituted Benzene Compounds for Blue Phase Displays
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Solution Overview
Problem
Existing liquid-crystalline compounds for blue phase displays have limitations in achieving high dielectric anisotropy, optical anisotropy, and low rotational viscosity, which are crucial for fast switching and low voltage operation, while also requiring stability and broad nematic phase range.
Innovation Solution
Development of fluorine-substituted benzene ring compounds with a terminal trifluoromethyl group and a -CF2O bridge, specifically designed for use in liquid-crystalline media, which exhibit high dielectric anisotropy, optical anisotropy, and low rotational viscosity, suitable for blue phase displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing liquid-crystalline compounds with 4 rings and -CF2O- bridge are used, then the basic liquid crystalline properties are achieved, but the product of dielectric anisotropy and optical anisotropy (Δn·Δε) is insufficient for fast switching and low voltage operation
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure through fluorine substitution on benzene rings and adding terminal CF3 groups. These structural parameter changes directly increase the dielectric anisotropy (Δε) and optical anisotropy (Δn), thereby improving the product Δn·Δε to enable faster switching speeds and lower operating voltages in blue phase liquid crystal displays.
2Speed
If compounds with high dielectric anisotropy and optical anisotropy are designed, then fast switching and low voltage operation are enabled, but the clearing point and phase stability may be affected
Solution Approach 1:
The patent applies local quality by strategically placing fluorine atoms at specific positions on the benzene rings and positioning the CF3 terminal groups at the ends of the molecular structure. This localized functional group arrangement optimizes the balance between achieving high dielectric and optical anisotropy for fast switching while maintaining appropriate clearing points and phase stability through controlled molecular packing and intermolecular interactions.
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
These compounds enable fast switching, low voltage operation, high clearing points, and stability, with improved solubility and a broad nematic phase range, enhancing the performance of liquid-crystalline media in blue phase displays.
Implementation Method 1
The basis for fast switching processes in these phases is the so-called Kerr effect. The Kerr effect is the change in birefringence of an optically transparent and isotropic material caused by an external electric field.
Data Source
AI summary
The present invention relates to liquid crystalline compounds comprising at least three fluorine-substituted benzene rings, a terminal trifluoromethyl group, and at least one -CF2O- bridge. The invention further relates to liquid crystalline media produced therefrom and to liquid crystal display devices (LC displays) containing these media.