Polymerizable Monomer Vertical Alignment Liquid Crystal Composition
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Solution Overview
Problem
Existing liquid crystal display devices face challenges with alignment defects due to scratches and dust on alignment films, and issues with uniform alignment as substrate size increases, particularly with compositions containing hydrophobic monomers and polymerizable self-alignment additives that either lack sufficient adsorption force or exhibit uneven spreading, leading to alignment issues and compatibility problems.
Innovation Solution
A liquid crystal composition incorporating specific self-aligning polymerizable monomers with a chemical structure that includes alkyl groups and polar groups, allowing for excellent vertical alignment and compatibility, eliminating the need for alignment films by ensuring uniform spreading and reducing alignment unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a polymerizable self-alignment additive with a polar group (such as a hydroxyl group) is used to increase adsorption force to the substrate, then the adsorption force increases, but the additive does not spread uniformly on the substrate, causing uneven alignment
Solution Approach 1:
The patent changes the chemical structure parameters of the self-alignment additive by introducing a specific molecular structure containing a polar group (hydroxyl group) and a non-polar group (phenyl group), creating an amphiphilic molecule. This structural parameter change enables the additive to have both sufficient adsorption force and uniform spreading capability, resolving the contradiction between strong adsorption and uniform alignment.
Solution Approach 2:
The patent uses a composite molecular structure combining polar and non-polar groups within the same molecule. The polar group provides adsorption force to the substrate while the non-polar group ensures uniform spreading and compatibility with the liquid crystal medium, effectively resolving the contradiction through molecular-level composite design.
2Force
If a polymerizable self-alignment additive with high adsorption force is used, then the adsorption force increases, but the liquid crystal composition exhibits hydrophobic properties causing the polymerizable compound to orient horizontally rather than vertically
Solution Approach 1:
The patent modifies the molecular parameters of the self-alignment additive by introducing a specific structure with both polar and non-polar groups. This parameter change allows the molecule to maintain vertical orientation by balancing the adsorption force (from the polar group) with the hydrophobic interaction (from the non-polar group), preventing horizontal orientation while maintaining strong adsorption.
3Force
If a polymerizable self-alignment additive with a polar group is used to enhance adsorption, then the adsorption force increases, but the compatibility with hydrophobic liquid crystal molecules decreases, causing precipitation
Solution Approach 1:
The patent employs a composite molecular structure where the non-polar phenyl group provides hydrophobicity for compatibility with liquid crystal molecules, while the polar hydroxyl group provides adsorption force. This composite design resolves the contradiction by having different parts of the same molecule fulfill opposing requirements.
Solution Approach 2:
The patent changes the molecular parameters to create an amphiphilic structure with specific polarity balance. This parameter adjustment ensures both sufficient adsorption force and adequate compatibility with hydrophobic liquid crystal molecules, preventing precipitation while maintaining strong substrate interaction.
4Manufacturing precision
If an alignment film is used to control liquid crystal molecule alignment, then alignment can be achieved, but alignment defects occur due to scratches and dust on the alignment film surface
Solution Approach 1:
The patent extracts and eliminates the alignment film from the system by using a polymerizable self-alignment additive that provides alignment functionality directly in the liquid crystal composition. This removes the source of alignment defects (scratches and dust on the film surface) while maintaining alignment uniformity through the molecular-level action of the additive.
Solution Approach 2:
The patent replaces the mechanical alignment film system with a chemical self-alignment mechanism. Instead of relying on a physical film that can be damaged, the system uses the chemical properties of the polymerizable self-alignment additive to induce vertical alignment of liquid crystal molecules, eliminating mechanical vulnerabilities.
5Manufacturing precision
If an alignment film is used to achieve uniform alignment, then alignment can be controlled, but it becomes difficult to design and manage the alignment film to obtain uniform alignment over the entire surface of the substrate as substrate size increases
Solution Approach 1:
The patent removes the alignment film entirely, replacing it with a bulk-phase chemical mechanism. This eliminates the complexity of designing and managing large-area alignment films while achieving uniform alignment through the molecular-level self-alignment property of the polymerizable additive throughout the entire liquid crystal layer.
Solution Approach 2:
The patent substitutes the mechanical alignment film system with a chemical self-assembly mechanism. The polymerizable self-alignment additive spontaneously orients liquid crystal molecules vertically through its molecular structure, providing uniform alignment across the entire substrate without the complexity of film design and management.
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 high compatibility and vertical alignment of liquid crystal molecules, reducing alignment unevenness and enhancing the performance of liquid crystal display devices by ensuring uniform alignment without the need for alignment films.
Implementation Method 1
a polymerizable monomer having a specific chemical structure and a spontaneously aligning monomer, wherein the polymerizable monomer has a chemical structure comprising an alkyl group and a polar group
Implementation Method 2
a liquid crystal composition containing a polymerizable monomer having a specific chemical structure and a spontaneously aligning monomer
Data Source
AI summary
A problem to be solved by the present invention is to provide a liquid crystal composition excellent in vertical alignment and compatibility and to provide a liquid crystal display device produced using the same. The problem is solved by a liquid crystal composition containing one or two or more kinds of self-aligning polymerizable monomers and one or two or more kinds of polymerizable monomers (or polymerizable compounds) having a specific chemical structure, and a liquid crystal display device produced using the same, specifically a liquid crystal composition containing a polymerizable monomer represented by General Formula (I) and a spontaneously aligning monomer which has a chemical structure different from that of the polymerizable monomer represented by General Formula (I), and has a polar group, and a liquid crystal display device containing the same.