Liquid Crystal Composition Adhesion to Polarizer
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Solution Overview
Problem
The existing polarizing plates face issues with hydrophobic optically anisotropic layers having inferior adhesiveness with hydrophilic polarizers, which affects the alignment properties and surface state of the optical films used in liquid crystal displays.
Innovation Solution
A liquid crystal composition containing a copolymer with specific repeating units, such as those represented by Formulas (I), (II), and (III), is used to improve the alignment properties and adhesiveness of the optically anisotropic layer, enhancing its interaction with the polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optically anisotropic layer is formed using conventional liquid crystal compositions, then the alignment properties may be adequate, but the surface state becomes hydrophobic resulting in inferior adhesiveness with hydrophilic polarizers
Solution Approach 1:
The invention changes the chemical composition parameters of the liquid crystal material by introducing specific polar groups (carboxyl, hydroxyl, or amine groups) into the liquid crystal compound structure. This parameter change transforms the surface properties from hydrophobic to hydrophilic, enabling improved adhesiveness with polarizers while maintaining adequate alignment properties
Solution Approach 2:
The invention creates a composite liquid crystal composition by combining liquid crystal compounds with specific functional groups (carboxyl, hydroxyl, or amine groups) with other liquid crystal materials. This composite approach achieves both good alignment properties and improved surface adhesiveness, resolving the contradiction between alignment quality and surface hydrophobicity
2Reliability
If additives are added to improve liquid crystal alignment, then alignment properties improve, but the surface state becomes more hydrophobic reducing adhesiveness with polarizers
Solution Approach 1:
Instead of adding conventional additives that worsen surface hydrophobicity, the invention changes the fundamental chemical structure of the liquid crystal compound itself by incorporating polar functional groups. This parameter change in the base material achieves both alignment improvement and surface hydrophilicity, avoiding the trade-off present in additive-based approaches
Solution Approach 2:
The polar functional groups (carboxyl, hydroxyl, amine) act as intermediaries that bridge the liquid crystal material and the polarizer surface. These intermediary groups provide both the alignment control function and the adhesive bridge function, eliminating the need for separate additives that would compromise surface properties
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 composition achieves excellent alignment properties, improves the surface state of the optically anisotropic layer, and enhances adhesiveness with the polarizer, leading to improved performance in polarizing plates and image display devices.
Implementation Method 1
a liquid crystal composition comprising: a copolymer having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II); and a liquid crystal compound
Implementation Method 2
improves the surface state of an optically anisotropic layer to be formed, and improves adhesiveness with a polarizer
Data Source
AI summary
A liquid crystal composition is provided which has excellent alignment properties, improves a surface state of an optically anisotropic layer to be formed, and improves adhesiveness with a polarizer, an optical film using the same, a polarizing plate, and an image display device. The liquid crystal composition according to the present invention is a liquid crystal composition containing a copolymer having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II), and a liquid crystal compound.