Fluorobenzene Liquid Crystal Compounds for Fast Response and Low Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices, particularly those operating in IPS or VA modes, face challenges in achieving improved response speed, contrast, reduced driving voltage, and wide temperature range operation due to limitations in liquid crystal compounds with negative dielectric anisotropy, stability, and compatibility.
Innovation Solution
A specific fluorobenzene derivative with three fluorine-substituted benzenes at each end, incorporated into a liquid crystal composition, which enhances stability, optical anisotropy, and compatibility, thereby improving the performance of liquid crystal display devices by increasing the clearing point, reducing viscosity, and lowering the threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal compounds with fluorine-substituted benzene are used, then the liquid crystal display device can operate in IPS or VA modes, but the response speed is slow and the driving voltage is high
Solution Approach 1:
The patent modifies the molecular structure of liquid crystal compounds by introducing specific fluorine-substituted benzene groups at terminal positions, which changes the dielectric anisotropy parameter to achieve larger negative values. This structural parameter change enables faster response speed and lower driving voltage in IPS and VA mode display devices
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with different molecular structures, including the newly developed fluorine-substituted benzene compounds. This composite approach balances various properties such as response speed, viscosity, and dielectric anisotropy to achieve overall performance improvement
2Loss of time
If liquid crystal compounds are designed to improve response speed, then the response time decreases, but the stability and compatibility of the liquid crystal composition deteriorate
Solution Approach 1:
The patent introduces fluorine atoms at specific terminal positions of the benzene rings rather than throughout the entire molecule. This localized modification achieves the desired negative dielectric anisotropy and fast response while maintaining the stability of the core molecular structure, ensuring good compatibility with other liquid crystal compounds
Solution Approach 2:
The patent carefully adjusts molecular parameters such as the number and position of fluorine substituents, the length of alkyl chains, and the core molecular structure to optimize the balance between response time and stability. By controlling these parameters, the liquid crystal composition achieves both fast response and reliable performance
3Speed
If the liquid crystal composition is optimized for fast response speed, then the response time improves, but the contrast ratio and viewing angle characteristics worsen
Solution Approach 1:
The patent formulates a composite liquid crystal composition that includes compounds with different optical and electrical properties. This composite approach allows the mixture to achieve fast response speed while maintaining appropriate contrast ratio and viewing angle characteristics that single compounds cannot provide
Solution Approach 2:
The patent adjusts optical parameters such as refractive index anisotropy and dielectric anisotropy by modifying the molecular structure of the liquid crystal compounds. These parameter changes enable the liquid crystal composition to simultaneously achieve fast response speed and good optical performance including contrast ratio
4Ease of manufacture
If conventional liquid crystal compounds are used, then the manufacturing process is simple, but the liquid crystal display device requires high driving voltage and has limited temperature range
Solution Approach 1:
The patent modifies the melting point and clearing point parameters of liquid crystal compounds by introducing fluorine-substituted benzene groups. These parameter changes expand the liquid crystal phase temperature range, enabling the display device to operate reliably across a wider temperature range while maintaining manufacturing simplicity
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 proposed solution results in liquid crystal display devices with enhanced response time, reduced electric power consumption, improved contrast, and a wider operational temperature range, specifically suited for IPS and VA modes.
Implementation Method 1
A liquid crystal display device typified by a liquid crystal display panel, a liquid crystal display module and so forth utilizes optical anisotropy, dielectric anisotropy and so forth
Implementation Method 2
A liquid crystal display device typified by a liquid crystal display panel, a liquid crystal display module and so forth utilizes optical anisotropy, dielectric anisotropy and so forth
Data Source
AI summary
A liquid crystal compound represented by formula (1-1).For example, R1 and R2 are independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; the ring A1 is trans-1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl; L1 and L2 are independently hydrogen or fluorine, and at least one of them is fluorine; and Z1, Z2 and Z3 are independently a single bond, —(CH2)2—, —CH═CH—, —C≡C—, —CH2O—, —OCH2—, —COO— or —OCO—.