Fluorine-Substituted Liquid Crystal Composition for High Transmittance
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Solution Overview
Problem
Liquid crystal display (LCD) technologies face challenges in achieving high transmittance while maintaining low driving voltage, wide viewing angle, and a wide operating temperature range, particularly in optimizing the liquid crystal composition for improved physical properties such as rotational viscosity and refractive index.
Innovation Solution
A liquid crystal composition incorporating polar LC molecules with fluorine substituents, represented by specific chemical formulas, is used to enhance transmittance and dielectric constants, which are then combined with positive LC molecules to maintain low driving voltage and improve dielectric anisotropy in an in-plane switching (IPS) mode LCD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LC composition is used, then driving voltage is maintained, but transmittance is insufficient
Solution Approach 1:
The patent modifies the molecular structure of LC compounds by introducing fluorine substituents at specific positions ( Chemical Formula A and Chemical Formula B) and adjusting terminal groups (L1-L4, R1-R5) to change dielectric anisotropy and refractive index parameters, thereby improving transmittance while maintaining driving voltage
Solution Approach 2:
The patent creates a composite LC composition by combining multiple LC compounds with different molecular structures (Chemical Formula A, Chemical Formula B, Chemical Formula C, Chemical Formula D, Chemical Formula E, Chemical Formula F, Chemical Formula G) in specific ratios to achieve synergistic effects that improve both transmittance and voltage characteristics
2Illumination intensity
If LC composition is optimized for high transmittance, then transmittance improves, but rotational viscosity increases
Solution Approach 1:
The patent carefully adjusts molecular parameters including fluorine substitution positions, chain lengths (R1-R5 with 1-9 carbon atoms), and terminal groups (L1-L4) to optimize the balance between refractive index (affecting transmittance) and rotational viscosity (affecting response speed)
3Adaptability or versatility
If LC composition is optimized for wide viewing angle, then viewing angle improves, but operating temperature range decreases
Solution Approach 1:
The patent combines multiple LC compounds with different melting points and phase transition characteristics (Chemical Formula E, F, G with various alkyl and alkoxy groups) to create a composition that maintains liquid crystal phase across a wide temperature range while achieving wide viewing angle through optimized optical anisotropy
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 LC composition increases transmittance and maintains low driving voltage, achieving improved dielectric properties and optical performance without increasing the driving voltage, thereby enhancing the overall LCD performance.
Implementation Method 1
enhance transmittance and dielectric constants, which are then combined with positive LC molecules to maintain low driving voltage and improve dielectric anisotropy
Implementation Method 2
research has been undertaken to improve the physical properties of the LC composition such as rotational viscosity, refractive index, etc.
Implementation Method 3
The LCD is configured to determine the orientation of LC molecules within an LC layer and to adjust the transmittance of light transmitted through the LC layer by applying a voltage to the field generating electrode and generating an electric field in the LC layer
Data Source
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AI summary
A liquid crystal composition includes at least one polar liquid crystal molecule represented by Chemical Formulas A or B. Each K is independently 1,4-cyclohexylene or 1,4-phenylene, groups connected to carbon ring of 1,4-cyclohexylene or 1,4-phenylene are all hydrogen or at least one of the groups is fluorine, and n is 1 or 2; in Chemical Formula A, X1 and X2 are independently a single bond, -CH2-, -CH2CH2-, -CF2-, -CH2O-, or -OCH2-, L1 and L2 are independently -H, -F, -CF3, or -OCF3, and R1 and R2 are independently an alkyl or alkoxy group having 1 to 9 carbon atoms or an alkenyl group having 2 to 9 carbon atoms; in Chemical Formula B, L3 and L4 are independently -H, -F, -CF3, or -OCF3, and R3 is an alkyl or alkoxy group having 1 to 9 carbon atoms or an alkenyl group having 2 to 9 carbon atoms.