Liquid Crystal Compound for Fast Response and Wide Phase Range
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face limitations in response time performance, particularly in achieving a broad nematic phase range and low rotational viscosity, which are crucial for improving display efficiency and reducing power consumption.
Innovation Solution
A novel liquid crystal compound with a specific molecular structure, including various alkyl, alkenyl, and fluorinated groups, is developed to enhance the nematic phase range, reduce viscosity, and lower driving voltage, suitable for use in TN, IPS, and VA modes, thereby improving LCD panel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional liquid crystal compounds are used in TN mode displays, then the device structure is simple and manufacturing is easy, but the response time is slow and the nematic phase range is limited
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific terminal groups (cyclohexyl, cyclohexenyl, tetrahydropyranyl, dioxanyl, dioxinyl, phenyl, pyridinyl, pyridazinyl, or pyrimidinyl groups) and controlling the substitution patterns (m and n values from 0-2, with 1≤m+n≤3). These parameter changes in molecular structure directly reduce rotational viscosity and broaden the nematic phase range, thereby improving response time while maintaining manufacturability through established synthesis routes.
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining the novel compound with specific ratios of other liquid crystal compounds (compounds 1-12). This composite approach synergistically improves the nematic phase range and response time characteristics while maintaining compatibility with conventional LCD manufacturing processes and device structures.
2Stability of the object's composition
If the nematic phase range is broadened to improve operating temperature range, then the liquid crystal stability is improved, but the rotational viscosity increases which slows down switching time
Solution Approach 1:
The patent applies local quality by introducing specific functional groups at terminal positions of the liquid crystal molecule (positions 1 and 6 of the cyclohexane ring). These localized structural modifications at specific molecular sites broaden the nematic phase range through enhanced intermolecular interactions, while the core molecular structure maintains low rotational viscosity characteristics, thus achieving both stability and fast switching.
Solution Approach 2:
The patent systematically varies molecular structure parameters including the type of terminal groups (A, B, C rings), substitution patterns (m and n values), and linker groups (Z) to optimize the balance between nematic phase range and rotational viscosity. By controlling these parameters within specific ranges, the invention achieves broad temperature operating range while maintaining fast response characteristics.
3Reliability
If new switching modes like IPS or VA are adopted to improve viewing angle and optical performance, then the optical effect is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent develops liquid crystal compounds with universal applicability across multiple display modes (TN, IPS, and VA modes). The molecular structure is designed to provide consistent performance characteristics—broad nematic phase range, low rotational viscosity, and appropriate dielectric anisotropy—that make the same compound suitable for different switching modes, thereby improving optical performance without necessarily increasing device complexity.
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 novel liquid crystal compound achieves a wide nematic liquid crystal temperature range, low viscosity, and short response time, efficiently enhancing the performance of LCDs in transmission, reflection, or transflection modes, making it suitable for various LCD applications.
Implementation Method 1
liquid crystals must exhibit dielectric anisotropy, defined as the difference of the dielectric constants parallel and perpendicular to the director of the nematic phase
Implementation Method 2
The prerequisite for liquid crystals is a broad nematic phase range of −40 to 100° C. in order to guarantee the so-called operating temperature range of LCDs
Implementation Method 3
The switching time of an LCD, such as on-state to off-state or off-state to on-state, is proportional to the rotational viscosity (γ1) of the liquid crystal
Data Source
AI summary
The disclosed is a liquid crystal compound and method for manufacturing the same. The liquid crystal compound can be used alone or mixed with commercially available liquid crystal compounds. Because low rotational viscosity of the liquid crystal compound of the invention, it can be used as positive or negative dielectric anisotropic liquid crystal composition.