Liquid Crystal Composition for Fast Low-Temperature Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal compositions used in display devices face challenges in maintaining high dielectric anisotropy, optical anisotropy, and response speed across a wide temperature range, particularly at low temperatures, leading to issues like ghosting and limited use in applications requiring dynamic image display at varying temperatures.
Innovation Solution
A liquid crystal composition comprising specific compounds of general formulas I, II, III, M, and N, which are formulated to provide optimal weight percentages to achieve reduced voltage change rates, faster response times, and appropriate anisotropy values, suitable for VA, IPS, or FFS display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal compositions are used, then dielectric anisotropy and optical anisotropy can be maintained, but response time increases and ghosting occurs at low temperatures
Solution Approach 1:
The patent modifies molecular parameters by introducing specific terminal groups (cyclohexyl, fluorinated alkyl) and core structures (terephthalate, isophthalate) to compounds I and II, which changes the liquid crystal composition's physical parameters including response time, dielectric anisotropy, and clearing point, enabling fast response without ghosting at low temperatures
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining compounds of formulas I and II in specific weight ratios (30-70 wt%), where the synergistic interaction between the two compound types achieves both fast response time and high reliability, preventing ghosting while maintaining display quality
2Speed
If liquid crystal materials are optimized for fast response time, then response speed improves, but voltage stability changes at high and low temperatures
Solution Approach 1:
The patent carefully adjusts molecular parameters including terminal group types (cyclohexyl, fluorinated groups), chain lengths (C1-C12 alkyl), and core structures to achieve optimal balance between response speed and voltage stability across temperature ranges, with compounds I and II formulated to maintain consistent electrical properties
Solution Approach 2:
The patent applies different functional groups at specific locations in the molecular structure: rigid core structures (terephthalate/isophthalate) provide structural stability and voltage consistency, while terminal groups (cyclohexyl, fluorinated alkyl) optimize response speed, creating local functional specialization that resolves the contradiction
3Speed
If clearing point is increased to improve low temperature performance, then response time at low temperature improves, but high temperature operation becomes limited
Solution Approach 1:
The patent optimizes the clearing point parameter to a specific range (80-100°C) by adjusting molecular structure parameters including terminal group types and chain lengths, achieving fast low-temperature response while ensuring adequate high-temperature operation through balanced molecular flexibility and rigidity
Solution Approach 2:
The patent creates a dynamic temperature-performance relationship where the liquid crystal composition adapts its response characteristics across temperature ranges, maintaining fast response at low temperatures while preserving operational stability at high temperatures through the synergistic formulation of compounds I and II
Data Source
AI summary
A liquid crystal composition and a liquid crystal display device including the liquid crystal composition include at least one compound of general formula I and at least one compound of general formula II. Compared with the prior art, the liquid crystal composition has a smaller voltage change rate at high and low temperatures and a shorter low temperature response time, while maintaining an appropriate optical anisotropy, an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, such that the liquid crystal display device having the liquid crystal composition has a better display and a faster response speed.