Fluorine-Substituted Liquid Crystal for Fast Response and Low Voltage
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Solution Overview
Problem
Current liquid crystal materials for TFT-LCDs face challenges in achieving quick response times, low driving voltage, and high stability under harsh conditions, such as heat and electromagnetic radiation, while maintaining appropriate dielectric and optical anisotropy, and chemical stability.
Innovation Solution
A liquid crystal compound with a specific structural formula, providing a wide nematic phase temperature range, high dielectric anisotropy, low rotary viscosity, and excellent stability, which can be used as a base material or additive to improve the performance of liquid crystal mixtures, including the use of fluorine-substituted alkyl and alkoxy groups to enhance dielectric anisotropy and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal materials are designed for fast response speed, then response time is reduced, but driving voltage increases
Solution Approach 1:
The patent applies parameter changes by carefully adjusting the molecular structure parameters of liquid crystal compounds, specifically incorporating fluorine-substituted alkyl and alkoxy groups with controlled carbon atom numbers (1-9) to optimize the balance between response speed and dielectric anisotropy, enabling fast response with reduced driving voltage
Solution Approach 2:
The patent uses composite materials by formulating mixed liquid crystal compositions that combine multiple compounds with different properties, where the synergistic effect of the components achieves both fast response speed and appropriate dielectric anisotropy for low driving voltage operation
2Use of energy by moving object
If liquid crystal materials are designed for low driving voltage, then power consumption is reduced, but response speed decreases
Solution Approach 1:
The patent optimizes molecular structure parameters by selecting specific fluorine-substituted groups and controlling carbon atom numbers to achieve high dielectric anisotropy, which enables low driving voltage operation while maintaining fast response speed through balanced physical properties
3Stability of the object's composition
If liquid crystal materials are designed for wide nematic phase temperature range, then temperature stability is improved, but dielectric anisotropy and response speed may be compromised
Solution Approach 1:
The patent applies parameter changes by adjusting the molecular structure parameters including the type of fluorine-substituted groups and carbon chain lengths to simultaneously achieve wide nematic phase temperature range and high dielectric anisotropy, ensuring both temperature stability and fast response speed
4Use of energy by moving object
If liquid crystal materials are designed for high dielectric anisotropy, then driving voltage is reduced, but rotary viscosity increases
Solution Approach 1:
The patent optimizes molecular structure parameters by incorporating fluorine-substituted alkyl and alkoxy groups with specific carbon atom numbers to achieve high dielectric anisotropy while controlling molecular size and shape to minimize rotary viscosity, enabling low driving voltage with fast response
Data Source
AI summary
The present disclosure discloses a liquid crystal compound and a liquid crystal composition. The liquid crystal compound has a general structural formula as represented by formula I. The liquid crystal composition provided by the present disclosure has a lower rotary viscosity γ1, can achieve a quick response, and further has an appropriate dielectric anisotropy Δ∈, an appropriate optical anisotropy Δn, a high stability to heat and light, a high VHR numerical value especially in the case where the liquid crystal is under harsh conditions, and a stability to electric field and electromagnetic radiation. As a liquid crystal material for use in thin film transistor techniques (TFT-LCD), the material further has the properties of a wider nematic phase temperature range, an appropriate birefringence anisotropy, a very high electrical resistivity, a good anti-ultraviolet performance, a high charge holding rate, a low vapor pressure etc.