Liquid Crystal Composition for 3D Displays with Reduced Afterimages
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Solution Overview
Problem
Liquid crystal displays, particularly those requiring wide viewing angles and high-speed response, face challenges in maintaining viscosity and refractive anisotropy control without alkenyl groups, which can lead to linear afterimages and stains.
Innovation Solution
A liquid crystal composition comprising specific compounds, including neutral and polar liquid crystal compounds, and reactive mesogens, which are formulated to maintain viscosity and refractive anisotropy within optimal ranges, ensuring high-speed response and reduced afterimages and stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the liquid crystal composition uses neutral liquid crystal compounds without alkenyl groups, then linear afterimages and stains are reduced, but viscosity and refractive anisotropy control becomes difficult
Solution Approach 1:
The patent uses a composite liquid crystal composition combining neutral liquid crystal compounds (without alkenyl groups) and polar liquid crystal compounds. This composite approach allows the material to achieve both reduced linear afterimages/stains from the neutral compounds and proper viscosity/refractive anisotropy control from the polar compounds, resolving the contradiction between harmful factor reduction and manufacturing precision.
Solution Approach 2:
The patent carefully controls the ratio and concentration of neutral and polar liquid crystal compounds in the composition. By adjusting these parameters, the invention achieves optimal balance between reducing linear afterimages/stains and maintaining proper viscosity and refractive anisotropy, enabling simultaneous improvement of harmful factor reduction and parameter control precision.
2Speed
If the cell gap is reduced to improve response speed, then high-speed response is achieved, but there is a limit to further reduction
Solution Approach 1:
The patent modifies the physical parameters of the liquid crystal material itself (viscosity, refractive anisotropy, dielectric anisotropy) through composition formulation. By optimizing these material parameters, the invention enables high response speed without requiring further reduction of cell gap, effectively resolving the contradiction between speed improvement and dimensional limitation.
3Speed
If the liquid crystal material has high dielectric anisotropy for VA type displays, then low voltage driving and high speed response are achieved, but viscosity must be low which complicates composition formulation
Solution Approach 1:
The patent employs a composite formulation combining neutral and polar liquid crystal compounds to achieve the desired balance. The neutral compounds provide low viscosity while the polar compounds contribute high dielectric anisotropy, allowing simultaneous satisfaction of response speed requirements and composition formulation challenges without excessive complexity.
Solution Approach 2:
The invention optimizes the concentration ratios and physical parameters of the liquid crystal components to achieve the target balance between viscosity and dielectric anisotropy. By carefully controlling these parameters, the patent simplifies the composition formulation process while maintaining high response speed performance.
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 improved response speed, reduced linear afterimages, and enhanced stability, making it suitable for 3D displays with high-speed response requirements.
Implementation Method 1
a liquid crystal material having negative dielectric anisotropy (Δε) is used
Implementation Method 2
the refractive anisotropy of the liquid crystal material needs to be controlled within an appropriate range so as to correspond to the cell gap
Implementation Method 3
a nematic phase-isotropic liquid phase transition temperature (Tni) is high
Data Source
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AI summary
A liquid crystal composition includes: a first category compound and a second category compound. The first category compound includes a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, where each R is independently an alkyl group having a carbon number of 1 to 7, and each R may be the same or different.