Liquid Crystal Compound Reducing Tilt Angle in Optical Films
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Solution Overview
Problem
Existing optical films with optically anisotropic layers face challenges in reducing the tilt angle of liquid crystal molecules, which affects the performance of image display devices by limiting viewing angles and color accuracy.
Innovation Solution
A compound represented by Formula (I) is used to create a polymerizable composition that, when incorporated into the optically anisotropic layer, reduces the tilt angle of liquid crystal molecules by participating in the polymerization reaction and minimizing distortion, thereby improving the alignment and performance of the optical film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymerizable composition including polymerizable rod-shaped liquid crystal compounds is used to form an optically anisotropic layer, then the liquid crystal molecules can be immobilized in a smectic phase state, but the tilt angle between the director direction and the layer plane remains large (10° or more)
Solution Approach 1:
The patent introduces a specific compound (Formula I) as an intermediary substance added to the polymerizable liquid crystal composition. This compound acts as a mediator that interacts with the polymerizable rod-shaped liquid crystal compounds to reduce their tilt angle during polymerization, thereby achieving better alignment without compromising the immobilization stability.
Solution Approach 2:
The patent modifies the compositional parameters of the liquid crystal system by incorporating a compound with specific molecular structure (Formula I) that has particular properties (aromatic rings, specific bonding groups). This parameter change in composition leads to a parameter change in the tilt angle, reducing it from 10° or more to below 10°.
2Manufacturing precision
If the tilt angle of liquid crystal molecules is reduced to improve viewing angle and color accuracy, then optical performance is enhanced, but the complexity of the polymerizable composition increases due to additional compound components
Solution Approach 1:
The patent applies local quality by having the compound (Formula I) specifically target and affect only the tilt angle parameter of the liquid crystal molecules, while leaving other properties (smectic phase formation, polymerizability, optical anisotropy) unchanged. This localized effect achieves alignment precision without globally complicating the system.
Solution Approach 2:
The patent creates a composite polymerizable composition that combines polymerizable rod-shaped liquid crystal compounds with the specific compound (Formula I). This composite material approach allows the synergistic combination of immobilization capability from the polymerizable liquid crystal and tilt angle reduction from the added compound, achieving both stability and precision.
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 use of the compound in the polymerizable composition results in a reduced tilt angle of liquid crystal molecules, enhancing the optical properties of the film, such as improved viewing angles and color accuracy, and stability of the cured product.
Implementation Method 1
one or more polymerizable rod-shaped liquid crystal compounds exhibiting a smectic phase
Implementation Method 2
optically anisotropic layer consisting of a liquid crystalline compound
Implementation Method 3
in a direction in which a refractive index of the optically anisotropic layer is maximized
Implementation Method 4
polymerizable composition including one or more polymerizable rod-shaped liquid crystal compounds
Data Source
AI summary
Provided is a compound which is capable of reducing a tilt angle of a liquid crystal molecule, and a polymerizable composition, a cured product, an optical film, a polarizing plate, and an image display device, each using the compound. The compound is represented, for example, by Formula (I), P-Sp-Z-G1-(X1-Cy1)n-(X2-A1)m-X3-A2.