Liquid Crystal Composition for Fast-Response High-Contrast Displays
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Solution Overview
Problem
Existing liquid crystal materials face challenges in achieving high contrast rate, transmittance, and low-temperature reliability, with issues such as light leakage, slow response speed, and limited elasticity constants, which are not adequately addressed by current IPS-type liquid crystal displays.
Innovation Solution
A liquid crystal composition is formulated using compounds with cycloalkenyl groups, specifically designed with compounds of general formulas I, II, and III, to enhance optical anisotropy, dielectric anisotropy, and elasticity constants, resulting in improved transmittance, contrast rate, and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the dielectric anisotropy Δε of the liquid crystal composition is decreased to improve transmittance, then transmittance is improved, but the drive voltage adjustment range becomes limited and optical anisotropy changes
Solution Approach 1:
The patent changes the dielectric anisotropy parameter Δε by selecting liquid crystal compounds with specific molecular structures (formulas I, II, and III) that provide optimized dielectric properties. This allows transmittance improvement while maintaining adequate drive voltage flexibility through careful parameter selection.
Solution Approach 2:
The patent uses a composite liquid crystal composition containing multiple compounds with different molecular structures (formulas I, II, and III) that work synergistically. This composite approach allows optimization of transmittance while maintaining drive voltage adjustment capability through the combined effects of different components.
2Object-generated harmful factors
If the average elastic constant Kave is increased to reduce light leakage, then light leakage is reduced, but the liquid crystal material requires higher energy input
Solution Approach 1:
The patent optimizes the average elastic constant Kave by selecting compounds with specific structural features that provide enhanced elastic properties. This reduces light leakage while controlling energy consumption through careful selection of molecular structures that balance elastic constant with other performance parameters.
Solution Approach 2:
The patent applies local quality optimization by designing compounds where specific molecular regions (such as the core structures in formulas I, II, and III) contribute differently to elastic constant and energy requirements. This allows targeted improvement of light leakage reduction while managing overall energy consumption.
3Speed
If the response speed is increased for faster display, then response speed is improved, but the liquid crystal material requires lower viscosity which may affect stability
Solution Approach 1:
The patent changes the viscosity parameter by selecting liquid crystal compounds with molecular structures (formulas I, II, and III) that provide optimized flow characteristics. This enables faster response speed while maintaining low-temperature reliability through careful selection of molecular weight, shape, and intermolecular interaction properties.
4Measurement precision
If the contrast rate is increased for better image quality, then contrast rate is improved, but the liquid crystal material requires higher optical anisotropy which may reduce transmittance
Solution Approach 1:
The patent uses a composite liquid crystal composition containing compounds with different molecular structures (formulas I, II, and III) that provide complementary optical properties. This composite approach allows simultaneous optimization of contrast rate and transmittance through the synergistic effects of different components with varying optical anisotropy.
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 composition achieves higher transmittance, faster response speed, and broader operating temperature range, suitable for fast-response VA, IPS, and NFFS display modes, with improved low-temperature storage and reduced light leakage.
Implementation Method 1
the liquid crystal composition prepared in the present invention has an appropriate optical anisotropy
Implementation Method 2
an appropriate absolute value of dielectric anisotropy
Data Source
AI summary
The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I, at least one compound of general formula II and at least one compound of general formula III. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, a larger K value, a smaller rotational viscosity, a shorter response time, a higher transmittance, a higher contrast rate and a longer low-temperature storage time, and a liquid crystal display device prepared thereby has excellent performances and is suitable for fast-response, high-contrast VA, IPS, NFFS display modes and the like.