Liquid-Crystal Composition for White Flicker and Response Time
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Solution Overview
Problem
Existing liquid-crystal displays face challenges such as insufficient specific resistance, high flicker, image sticking, and slow response times, particularly in high-information displays like televisions and monitors, which are not adequately addressed by current liquid-crystal mixtures.
Innovation Solution
A liquid-crystal medium comprising compounds with negative dielectric anisotropy, combined with positive polar compounds, is used to enhance specific resistance, reduce flicker, and improve response times, while maintaining high reliability and stability across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LC mixtures are used for display applications, then the displays can operate, but they exhibit high flicker and inadequate response times, especially at extreme temperatures and over long operating periods
Solution Approach 1:
The patent modifies the chemical composition parameters of the LC mixture by introducing specific compounds (formulae B, C, and G with terminal 3,4-difluorophenyl group) to change the physical properties of the medium, achieving both reduced flicker and improved response time simultaneously
Solution Approach 2:
The invention uses a composite liquid-crystal medium comprising multiple specific compounds (formulae B, C, and G) combined together, where the synergistic effect of these compounds achieves the dual improvement of reliability and response time that cannot be obtained from single compounds
2Use of energy by moving object
If liquid-crystal media with high dielectric anisotropy are used, then the threshold voltage is reduced, but flicker increases
Solution Approach 1:
The patent precisely adjusts the dielectric anisotropy parameter by selecting specific compounds with controlled dielectric properties, achieving an optimal balance where threshold voltage remains low while flicker is minimized through the specific molecular structures of compounds B, C, and G
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 proposed liquid-crystal medium achieves reduced flicker, improved response times, and enhanced reliability, with high transmittance and contrast, suitable for displays like VA, IPS, and FFS modes, especially in televisions and monitors.
Implementation Method 1
The principle of electrically controlled birefringence, the ECB effect or also DAP (deformation of aligned phases) effect, was described for the first time in 1971
Implementation Method 2
The principle of electrically controlled birefringence, the ECB effect
Implementation Method 3
values for the dielectric anisotropy of Δε≤−0.5 in order to be suitable for use in high-information display elements based on the ECB effect
Data Source
AI summary
A method for reducing white flicker by bringing together into a composition one or more compounds of formula G with one or more compounds of formula B and/or C to form a liquid crystal (LC) medium having negative dielectric anisotropy, wherein the reduction of white flicker is achieved compared to an otherwise identical composition, but which does not include either (i) a compound of formula G or (ii) a compound of formula B and/or C.