Trifluoronaphthalene Liquid Crystal for Wide Viewing Angles
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Solution Overview
Problem
Conventional liquid crystal display elements with positive dielectric constant anisotropy suffer from narrow viewing angles, and existing negative dielectric constant anisotropy compositions do not provide sufficient absolute values, limiting their effectiveness in larger display panels.
Innovation Solution
A trifluoronaphthalene derivative-based nematic liquid crystal composition with a cyclohexylmethoxy group at the 6-position of the naphthalene ring is developed, which exhibits a large negative dielectric constant anisotropy, suitable for vertical alignment mode and in-plane switching (IPS) display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional liquid crystal compositions with positive dielectric constant anisotropy are used, then activation at low voltage is achieved, but viewing angle becomes narrow
Solution Approach 1:
The patent changes the dielectric constant anisotropy parameter from positive to negative by introducing trifluoronaphthalene derivatives with specific molecular structures. This parameter change enables the liquid crystal composition to be used in vertical alignment mode and IPS modes, which provide wide viewing angles while maintaining display performance
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining trifluoronaphthalene derivatives (providing negative dielectric constant anisotropy) with other liquid crystal compounds. This composite approach achieves both wide viewing angle and excellent display characteristics including fast response time and high contrast ratio
2Ease of operation
If liquid crystal compositions with negative dielectric constant anisotropy are used to improve viewing angle, then viewing angle is improved, but absolute value of dielectric constant anisotropy is insufficient
Solution Approach 1:
The patent optimizes the molecular structure of trifluoronaphthalene derivatives by varying substituents at specific positions (R1-R6 groups) to precisely control the dielectric constant anisotropy parameter. This structural optimization achieves large negative values (absolute value ≥ 0.5) while maintaining the negative sign required for wide viewing angle modes
Solution Approach 2:
The patent introduces specific functional groups at localized positions on the naphthalene ring structure (such as cyclohexylmethoxy groups at the 6-position and alkoxy groups at the 2-position) to enhance the dielectric constant anisotropy. These localized structural modifications contribute to achieving the required magnitude without compromising the overall negative dielectric constant anisotropy property
3Shape
If compounds with alkoxy group at 2-position of naphthalene ring and cyclohexylmethoxy group at 6-position are used, then desired molecular structure is achieved, but chemical stability deteriorates
Solution Approach 1:
The patent carefully selects and optimizes the specific alkoxy group substituents at the 2-position and cyclohexylmethoxy group at the 6-position to achieve the desired molecular shape and packing while minimizing chemical instability. By controlling the chain length and structure of these localized groups, the patent maintains chemical stability while achieving the required molecular geometry for liquid crystal phase formation
Solution Approach 2:
The patent develops a series of trifluoronaphthalene derivatives with varying substituent structures to identify compositions that provide sufficient chemical stability for practical use. By screening multiple structural variants, the patent identifies stable combinations that can be used in commercial liquid crystal displays despite the inherent instability of certain functional group combinations
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 trifluoronaphthalene derivative composition significantly improves dielectric constant anisotropy to negative values with large absolute values, enhancing viewing angles and voltage retention, making it suitable for advanced liquid crystal display elements.
Implementation Method 1
a liquid crystal composition having a negative dielectric constant anisotropy is used
Implementation Method 2
vertically-aligned liquid crystal molecules are used to improve a view angle
Implementation Method 3
Ga and Gb each independently denotes a trans-1,4-cyclohexylene group or a 1,4-phenylene group
Data Source
AI summary
The present invention was realized in order to provide a liquid crystal composition which is negative in dielectric constant anisotropy and having a large absolute value and a display element, and also to provide a compound which is negative in dielectric constant anisotropy and having a large absolute value.The present invention was realized in order to provide a trifluoronaphthalene derivative expressed by the general formula (I)a liquid crystal composition containing the above compound and a display element in which the liquid crystal composition is used. The liquid crystal composition of the present invention has features in which the dielectric constant anisotropy is great in absolute value, and a liquid crystal display element in which the liquid crystal composition is used as a constituting member is useful as a liquid crystal display element based on vertical alignment mode, IPS or others.