Vertical Dielectric Liquid Crystal Composition for Fast Response and Low Power
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Solution Overview
Problem
Current liquid crystal materials for TFT-LCDs face challenges in achieving quick response times, low drive voltage, high light transmittance, and energy efficiency, with limitations in chemical and thermal stability, viscosity, and dielectric properties, which affect display performance and energy consumption.
Innovation Solution
A liquid crystal composition comprising specific compounds of formulas I, II, III, IV, and V, which adjust dielectric anisotropy, rotary viscosity, and clearing point, enabling improved vertical dielectric anisotropy, low viscosity, and high light transmittance, thereby enhancing display brightness and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal materials are designed to have quick response speed by reducing rotary viscosity γ1, then response time is improved, but drive voltage increases and power consumption increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular structure parameters of liquid crystal compounds, including substituent types, positions, and combinations. By adjusting these molecular parameters, the invention achieves optimal balance between rotary viscosity (for response speed) and dielectric anisotropy (for drive voltage), resolving the contradiction between quick response and low power consumption
Solution Approach 2:
The patent uses composite materials by formulating liquid crystal compositions containing multiple compounds with different molecular structures and properties. This composite approach allows the mixture to achieve both low rotary viscosity (for fast response) and appropriate dielectric anisotropy (for low drive voltage), simultaneously resolving the conflicting requirements
2Use of energy by moving object
If drive voltage is reduced to lower power consumption, then energy efficiency is improved, but response time increases due to slower liquid crystal molecule reorientation
Solution Approach 1:
The patent changes molecular structure parameters to optimize the balance between dielectric anisotropy (affecting drive voltage) and rotary viscosity (affecting response time). By carefully selecting substituent groups and their positions, the invention achieves high dielectric anisotropy for low drive voltage while maintaining low rotary viscosity for fast response, thus resolving the contradiction between energy efficiency and response time
3Loss of time
If liquid crystal cell thickness is reduced to improve response time, then rise time and fall time are shortened, but manufacturing precision requirements increase and display uniformity becomes more difficult to control
Solution Approach 1:
The patent changes the liquid crystal material parameters (viscosity and dielectric properties) to achieve fast response times without requiring extreme thinning of the cell. By optimizing molecular structure for low rotary viscosity and high dielectric anisotropy, the invention enables acceptable response times at practical cell thicknesses, thus resolving the contradiction between response time and manufacturing precision
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 liquid crystal composition achieves a wider refractive index, higher clearing point, and lower viscosity, resulting in faster response times, reduced drive voltage, and increased light transmittance, leading to improved display performance and energy savings.
Implementation Method 1
highly vertical dielectric liquid crystal compound
Implementation Method 2
a suitable birefringence anisotropy
Data Source
AI summary
Disclosed are a liquid crystal composition comprising a liquid of formula I and formula II-B, and a liquid crystal compound and a related liquid crystal display devicewherein R0, R1, R2 and R3 each independently represent an alkyl group having a carbon atom number of 1-10, a fluoro-substituted alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, a fluoro-substituted alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10, a fluoro-substituted alkenyl group having a carbon atom number of 2-10, an alkenoxy group having a carbon atom number of 3-8 or a fluoro-substituted alkenoxy group having a carbon atom number of 3-8, and any one or more non-connected CH2 in R0, R1, R2 and R3 may be substituted with cyclopentyl, cyclobutyl, cyclopropyl or —O—; Y represents ethyl or ethenyl;each independently represent one ofand any fluorobenzene;represents benzene or fluorobenzene; and m represents one of 1, 2 and 3, and n represents one of 1 and 0.