Liquid Crystal Composition Self-Alignment Polymerizable Compounds
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Solution Overview
Problem
Liquid crystal display elements face issues with alignment defects due to surface scratches or dust, and the challenge of maintaining uniform alignment as substrate sizes increase, along with changes in pretilt angle over time affecting display unevenness.
Innovation Solution
A liquid crystal composition incorporating one or more self-alignment polymerizable compounds and specific amounts of polymerizable compounds to achieve vertical alignment and stability of pretilt angle, eliminating alignment unevenness and ensuring compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an alignment film is used to align liquid crystal molecules, then initial alignment can be achieved, but alignment defects occur due to scratches or dust and uniform alignment becomes difficult as substrate size increases
Solution Approach 1:
The invention removes the alignment film component from the liquid crystal display structure by using a liquid crystal composition that contains spontaneous orientation capability. The liquid crystal molecules self-align through their inherent molecular properties and interaction with the substrate, eliminating the need for a separate alignment film layer that is prone to defects from scratches and dust.
Solution Approach 2:
The liquid crystal composition possesses spontaneous orientation capability, allowing the liquid crystal molecules to automatically align themselves in a specific direction without external alignment assistance. This self-alignment mechanism enables uniform orientation across large substrate areas without requiring complex alignment film management.
2Manufacturing precision
If self-alignment additive with hydroxyl group is used to control pretilt angle, then initial pretilt can be set to desired value, but pretilt angle changes with time causing display unevenness
Solution Approach 1:
The invention modifies the chemical structure of the self-alignment additive by introducing a rigid rod-like mesogenic group in addition to the hydroxyl group. This structural parameter change enhances the additive's ability to maintain stable pretilt angle over time by improving its interaction with liquid crystal molecules and resistance to degradation, thereby preventing display unevenness.
Solution Approach 2:
The invention uses a composite approach by combining the self-alignment additive with specific liquid crystal compounds having particular molecular structures. This composite system ensures both accurate initial pretilt angle control and long-term stability by leveraging the synergistic effects between the additive and liquid crystal molecules.
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 exhibits high compatibility and excellent vertical alignment with minimal change in pretilt angle over time, reducing alignment unevenness and enhancing the reliability of liquid crystal display elements.
Implementation Method 1
a liquid crystal composition containing a spontaneous orientation material for controlling the alignment of liquid crystal molecules
Implementation Method 2
a liquid crystal composition including one kind or two or more kinds of self-alignment polymerizable compounds and one kind or two or more kinds of polymerizable compounds
Data Source
AI summary
The present invention provides a liquid crystal composition, containing: one kind or two or more kinds of a first monomer having a first mesogenic skeleton, at least one polymerizable group represented by the general formula (PG1) linked to the first mesogenic skeleton, and at least one polar group linked to the mesogenic skeleton or the polymerizable group; and one kind or two or more kinds of a second monomer having a second mesogenic skeleton and a polymerizable group represented by the general formula (PG2) linked to the second mesogenic skeleton, and having a chemical structure different from that of the first monomer, in an amount of more than 0.4% by mass, which is excellent in vertical alignment, burn-in characteristics (change with time of pretilt angle), and compatibility, and provides a liquid crystal display element using the liquid crystal composition.