Liquid Crystal Composition for Fast Response and Low Afterimage
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses face reduced display quality due to afterimages caused by slow response time and impurities in the liquid crystal layer, where improving response time with certain additives can worsen afterimages and reliability.
Innovation Solution
A liquid crystal composition comprising a specific blend of bicyclohexyl, cyclohexyl phenyl, bicyclohexyl phenyl, cyclohexyl biphenyl, and terphenyl compounds, which improves the response time and display quality while minimizing afterimages, with the bicyclohexyl compound contributing to reduced rotation viscosity and the terphenyl compound maintaining anisotropy stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If molecules are added to improve response time, then rising time and falling time are improved, but afterimages increase and reliability is reduced
Solution Approach 1:
The patent uses a composite liquid crystal composition containing four specific compounds (cyclohexyl phenyl compound, bicyclohexyl phenyl compound, cyclohexyl biphenyl compound, and terphenyl compound) in specific weight ratios. This composite formulation achieves both fast response time (5ms or less) and reduced afterimages by combining the complementary properties of each compound, rather than using a single additive approach.
Solution Approach 2:
The patent optimizes the weight ratios of each compound within specific ranges: cyclohexyl phenyl compound (30-70 wt%), bicyclohexyl phenyl compound (10-40 wt%), cyclohexyl biphenyl compound (10-30 wt%), and terphenyl compound (5-20 wt%). By precisely controlling these compositional parameters, the invention achieves the optimal balance between response time and afterimage reduction.
2Adaptability or versatility
If liquid crystal molecules are used with negative dielectric anisotropy for VA mode, then viewing angles are improved, but response time becomes slow
Solution Approach 1:
The patent employs a composite formulation of four liquid crystal compounds, each contributing different properties. The cyclohexyl phenyl compound provides negative dielectric anisotropy for VA mode operation and wide viewing angles, while the other compounds (bicyclohexyl phenyl, cyclohexyl biphenyl, and terphenyl) collectively reduce the rotation viscosity to achieve fast response time of 5ms or less, thus resolving the contradiction between viewing angle and response time.
Solution Approach 2:
The invention changes the physical parameters of the liquid crystal system by optimizing the compositional ratios of multiple compounds. Specifically, the controlled presence of compounds with lower rotation viscosity (bicyclohexyl phenyl, cyclohexyl biphenyl) in combination with the VA-mode compound enables maintaining negative dielectric anisotropy while achieving response time of 5ms or less, thus improving both viewing angles and response speed.
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 enhances the response time and display quality of LCDs by reducing rotation viscosity and maintaining anisotropy stability, thereby minimizing afterimages and improving overall performance.
Implementation Method 1
liquid crystal molecules of the liquid crystal layer orient so that their axes align in the same direction and with the same degree of rotation according to the strength of the field
Implementation Method 2
the bicyclohexyl compound contributing to reduced rotation viscosity
Implementation Method 3
the terphenyl compound maintaining anisotropy stability
Data Source
AI summary
A liquid crystal composition includes a bicyclohexyl compound in an amount of about 35 percent by weight to about 50 percent by weight, a cyclohexyl phenyl compound in an amount of about 15 percent by weight to about 25 percent by weight, a bicyclohexyl phenyl compound in an amount of about 20 percent by weight to about 25 percent by weight, and a cyclohexyl biphenyl compound in an amount of about 15 percent by weight to about 20 percent by weight. The liquid crystal composition can improve the display quality and response time of a liquid crystal display (LCD) apparatus.