Liquid Crystal Composition for Display Devices
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving low viscosity, high reliability, and appropriate optical and dielectric anisotropy simultaneously, as optimizing one performance parameter often affects others, leading to instability and increased electric power consumption.
Innovation Solution
A liquid crystal composition comprising specific compounds of general formulas I, II, III, IV, V, VI, and VII, with defined weight percentages, which are selected to provide low viscosity, high reliability, and appropriate optical and dielectric anisotropy, suitable for use in liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal material having low viscosity is comprised, then response time will be shortened, but it may affect the stability and reliability of the display device
Solution Approach 1:
The patent employs a composite liquid crystal composition comprising multiple specific compounds (cyclic carboxylic acid esters, cyclic carbonates, and cyclic carbamates with defined structural formulas) in optimized weight ratios. This composite approach allows the mixture to achieve lower viscosity for faster response while maintaining high reliability through the synergistic stability of the carefully selected components.
Solution Approach 2:
The patent optimizes the viscosity parameter by selecting specific cyclic compounds with particular molecular structures and combining them in precise weight ratios (5-40% cyclic carboxylic acid esters, 30-60% cyclic carbonates, 5-40% cyclic carbamates). This parameter optimization enables the liquid crystal material to achieve viscosity below 50 mPa·s at 20°C, thereby shortening response time while preserving display stability.
2Use of energy by moving object
If liquid crystal material having large dielectric anisotropy is comprised, then threshold voltage and electric power consumption will be reduced, but the material becomes more susceptible to destruction by light, heat or electric, resulting in ion release and reduced resistivity
Solution Approach 1:
The patent creates a composite liquid crystal system where cyclic carboxylic acid esters, cyclic carbonates, and cyclic carbamates work synergistically. This composite structure achieves the desired dielectric anisotropy for reduced power consumption while the diverse molecular structures provide resistance against degradation from light, heat, and electric fields, preventing ion release and maintaining resistivity stability.
Solution Approach 2:
The patent introduces compounds with specific local structural characteristics (cyclic structures with particular functional groups) that provide localized stability against environmental degradation. These structurally distinct components are distributed throughout the liquid crystal mixture, with each contributing specific properties that collectively achieve both low power consumption and high reliability.
3Manufacturing precision
If liquid crystal material having appropriate optical anisotropy is comprised, then contrast ratio will increase, but viewing angle may be limited
Solution Approach 1:
The patent formulates a composite liquid crystal composition combining cyclic carboxylic acid esters, cyclic carbonates, and cyclic carbamates in optimized proportions. This composite approach enables simultaneous achievement of high contrast ratio (through appropriate optical anisotropy) and wide viewing angle (through the complementary optical properties of the different cyclic compounds), resolving the trade-off between these two display performance parameters.
Data Source
AI summary
Provided is a liquid crystal composition, which comprises a component prepared from one or more compounds selected from a general formula I; and a component prepared from one or more compounds selected from a general formula II. The liquid crystal composition has the characteristics of low viscosity, high reliability, appropriate optical anisotropy, and appropriate dielectric anisotropy, and is applicable to liquid crystal display devices.