Liquid Crystal Composition for Fast Response and Low Image Sticking
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Solution Overview
Problem
Liquid crystal display devices face issues with dropping marks and image sticking during manufacturing, which degrade display quality and yield, especially with the use of acrylate-based monomers and additives like antioxidants, limiting their application in active matrix devices.
Innovation Solution
A liquid crystal composition is developed with specific compounds at optimized mixing ratios to minimize dropping marks and image sticking, utilizing a one drop fill method and adjusting refractive index anisotropy and rotational viscosity to enhance manufacturing efficiency and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acrylate-based monomers and additives are added to liquid crystal composition to achieve fast response and pre-tilt angle formation, then response speed is improved, but dropping marks and image sticking occur degrading display quality
Solution Approach 1:
The patent changes the chemical structure parameters of the liquid crystal compounds by introducing specific cyclic carbonate groups and adjusting molecular weight, which modifies the interaction between liquid crystal molecules and monomer additives. This parameter change allows fast response speed while reducing dropping marks and image sticking phenomena.
Solution Approach 2:
The patent creates a composite liquid crystal composition by carefully selecting and combining multiple liquid crystal compounds with specific molecular structures (cyclic carbonate groups) and controlling the monomer content. This composite approach achieves synergistic effects that improve response speed while minimizing harmful side effects.
2Productivity
If liquid crystal composition is dropped on substrate using one drop fill method to improve manufacturing efficiency, then productivity is improved, but dropping marks occur degrading display quality
Solution Approach 1:
The patent modifies the physical and chemical parameters of the liquid crystal composition, including viscosity and molecular structure, to optimize the dripping behavior during one drop fill injection. This enables efficient manufacturing while preventing dropping marks on the display.
3Reliability
If liquid crystal composition contains multiple compounds to optimize dielectric anisotropy and refractive index, then display performance is improved, but composition stability and manufacturing consistency become difficult to maintain
Solution Approach 1:
The patent establishes specific parameter ranges for liquid crystal compound molecular weights and cyclic carbonate group configurations, which standardizes the composition while maintaining optimal display performance. This parameter control ensures both reliability and manufacturing consistency.
Data Source
Figure 1~2
AI summary
The present invention relates to a nematic liquid crystal composition useful as a liquid crystal display material and showing a negative value of dielectric anisotropy (Δε), and to a liquid crystal display device using the liquid crystal composition. The present invention provides a liquid crystal composition which causes little dropping marks during manufacture without degrading characteristics, such as dielectric anisotropy, viscosity, an upper limit temperature of a nematic phase, γ1, and the like, and image sticking of a display device. The liquid crystal display device of the present invention has excellent fast response, the characteristic of causing little image sticking, and the characteristic of causing little dropping marks due to its manufacture, and are thus particularly useful for VA-mode and PSVA-mode liquid crystal display devices for active matrix driving and can be applied to liquid crystal display devices such as liquid crystal TV, a monitor, and the like.