Liquid Crystal Composition with 1,3-Dioxane for Response Speed
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Solution Overview
Problem
Current liquid crystal displays face challenges in achieving low voltage driving, high voltage holding ratio, wide viewing angle, wide operation temperature range, high speed response, and high transmittance due to limitations in the physical properties of the liquid crystal composition, particularly in rotation viscosity and refractive index.
Innovation Solution
A liquid crystal composition incorporating specific liquid crystal molecules represented by Chemical Formulas 1-1 to 1-6 and 2-1 to 2-6, which include 1,3-dioxane and tetrahydropyran structures, is used to enhance the glass transition temperature and maintain low rotation viscosity, thereby improving response speed and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal composition is used, then manufacturing cost is low, but response speed is slow due to high rotation viscosity
Solution Approach 1:
The patent changes the molecular structure parameters of liquid crystal compounds by introducing specific cyclic structures (1,3-dioxane and tetrahydropyran) with oxygen atoms at positions 3 and 4 of the benzene ring. This structural parameter change reduces rotation viscosity and improves response speed while maintaining other display performance characteristics.
Solution Approach 2:
The patent employs a composite liquid crystal composition containing multiple compounds with specific structures (Formulas 1-1 to 1-6 and 2-1 to 2-6) in defined weight ratios. The composite formulation combines compounds with different properties to achieve optimal balance between response speed, transmittance, and stability, resolving the contradiction between speed and viscosity.
2Stability of the object's composition
If liquid crystal composition with high glass transition temperature is used, then stability is improved, but viscosity increases reducing response speed
Solution Approach 1:
The patent achieves the dual goal of high glass transition temperature and low viscosity by changing the molecular structure parameters - specifically introducing rigid cyclic structures (1,3-dioxane and tetrahydropyran) that increase thermal stability while the oxygen-containing heterocyclic structure maintains fluidity and reduces rotation viscosity.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups (oxygen atoms at positions 3 and 4 of benzene ring) at critical locations in the molecular structure. This localized structural modification provides high glass transition temperature in the core structure while maintaining low viscosity through the heterocyclic oxygen-containing groups.
3Use of energy by moving object
If liquid crystal composition is optimized for low voltage driving, then power consumption is reduced, but voltage holding ratio decreases
Solution Approach 1:
The patent uses a composite liquid crystal composition with multiple compounds in specific ratios (each compound at 1-20 wt%) to achieve both low voltage driving and high voltage holding ratio. The synergistic combination of compounds with different dielectric and viscosity properties allows low operating voltage while maintaining stable voltage holding through the collective molecular interactions.
Solution Approach 2:
The patent changes the dielectric and viscosity parameters of the liquid crystal composition by introducing compounds with specific molecular structures (Formulas 1-1 to 1-6 and 2-1 to 2-6). These structural changes optimize the balance between dielectric anisotropy (for low voltage driving) and viscosity (for voltage holding), enabling both low power consumption and high reliability.
4Illumination intensity
If liquid crystal composition with high transmittance is used, then display brightness is improved, but response speed decreases due to increased viscosity
Solution Approach 1:
The patent changes the molecular structure parameters by introducing 1,3-dioxane and tetrahydropyran structures with oxygen atoms at positions 3 and 4 of the benzene ring. This structural modification achieves high transmittance through the optimized molecular packing and electronic structure while simultaneously reducing rotation viscosity, thereby improving both brightness and response speed without the traditional trade-off.
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 composition increases the glass transition temperature and maintains low rotation viscosity, resulting in improved response speed and transmittance, addressing the limitations of existing liquid crystal displays.
Implementation Method 1
an electric field is generated in a liquid crystal layer by applying a voltage to the field generating electrode, such that alignment of liquid crystal molecules positioned in the liquid crystal layer may be determined and transmittance of light transmitting the liquid crystal layer may be adjusted
Data Source
AI summary
A liquid crystal composition includes at least one liquid crystal molecule represented by Chemical Formulas 1-1 to 1-6, and at least one liquid crystal molecule represented by Chemical Formulas 2-1 to 2-6.