Liquid Crystal Medium for IPS Displays
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Solution Overview
Problem
Current liquid crystal displays face challenges with high contrast requiring high elastic constants, which can result in slower response times, and there is a need for liquid crystal media with high reliability and fast response times while maintaining high contrast.
Innovation Solution
A liquid crystal medium comprising specific compounds of formulas I, II, and III, which when combined, achieve faster switching times without compromising contrast, and can include additional compounds like those of formulas IV, V, and VI to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high elastic constants are used to achieve high contrast, then contrast is improved, but response time becomes slower
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal medium by incorporating specific compounds (cyclohexylbenzene derivatives, phenylcyclopropane carboxylate derivatives, and phenylcyclobutane carboxylate derivatives) with defined molecular structures and ratios. This chemical parameter change enables the liquid crystal to achieve high contrast through its intrinsic molecular properties rather than relying solely on high elastic constants, thereby resolving the trade-off between contrast and response time.
Solution Approach 2:
The patent creates a composite liquid crystal medium by combining multiple compounds with different molecular structures and properties. The specific combination of cyclohexylbenzene derivatives, phenylcyclopropane carboxylate derivatives, and phenylcyclobutane carboxylate derivatives forms a composite material that synergistically achieves both high contrast and fast response time, overcoming the limitations of single-component liquid crystals.
2Speed
If switching time is reduced for faster response, then response time is improved, but contrast may be compromised
Solution Approach 1:
The patent changes the physical-chemical parameters of the liquid crystal medium by selecting compounds with specific molecular weights, viscosities, and elastic constants. The cyclohexylbenzene derivatives and cycloalkane carboxylate derivatives are chosen for their optimal viscosity-to-elasticity ratio, enabling fast switching while the specific molecular structures maintain high contrast through effective light modulation.
Solution Approach 2:
The patent applies different functional characteristics to different molecular components within the liquid crystal medium. The cyclohexylbenzene derivatives provide structural stability and contrast, while the cycloalkane carboxylate derivatives contribute to fast switching dynamics. This local optimization of molecular functions within the composite medium achieves both fast response and high contrast simultaneously.
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 medium enables faster switching times and improved contrast, addressing the trade-off between high contrast and response time, and provides a more reliable liquid crystal solution for displays.
Implementation Method 1
OCB ('optically compensated bend') displays are known which are based on a birefringence effect
Implementation Method 2
the LC medium usually has a negative dielectric anisotropy
Data Source
AI summary
The present invention relates to a liquid crystal (LC) medium comprising a compound of formula (I) and one or more compounds of formula (II) as defined in claim 1, and to the use thereof for optical, electro-optical and electronic purposes, in particular in LC displays, especially in IPS, FFS, VA or PS-VA displays.