Polymerizable Polar Compound for Liquid Crystal Alignment
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high chemical stability, effective horizontal alignment of liquid crystal molecules, and maintaining compatibility with liquid crystal compositions, particularly in terms of solubility and voltage holding ratio, while also requiring suitable optical and dielectric anisotropy for optimal performance.
Innovation Solution
A polymerizable polar compound with an itaconate group is introduced, which forms a network structure upon polymerization, enhancing the alignment of liquid crystal molecules and providing high solubility, stability, and a large voltage holding ratio, thus eliminating the need for an alignment film and improving device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a polymerizable compound is added to liquid crystal composition, then the alignment of liquid crystal molecules is improved, but the chemical stability and solubility in the composition deteriorate
Solution Approach 1:
The patent modifies the chemical structure of the polymerizable compound by introducing specific functional groups (carboxyl, hydroxyl, amino groups) and adjusting molecular weight and polarity parameters. These parameter changes enable the compound to maintain both alignment capability and chemical stability/solubility in the liquid crystal composition.
Solution Approach 2:
The patent creates a composite system by combining the polymerizable compound with specific liquid crystal materials. The compound contains multiple functional groups that interact with the liquid crystal molecules, forming a composite structure that achieves both good alignment and maintained chemical stability and solubility.
2Manufacturing precision
If an alignment film is used to align liquid crystal molecules, then the alignment is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent extracts and eliminates the alignment film component from the device structure. Instead of using a separate alignment film layer, the alignment function is integrated into the liquid crystal composition itself through the polymerizable compound, thereby simplifying the device structure and reducing production complexity.
Solution Approach 2:
The polymerizable compound performs multiple functions: it acts as both a liquid crystal material component and an alignment-inducing agent. This multi-functionality eliminates the need for a separate alignment film, reducing device complexity while maintaining alignment performance.
3Speed
If the viscosity of the liquid crystal composition is reduced to shorten response time, then the response time is improved, but the temperature range of the nematic phase narrows
Solution Approach 1:
The patent adjusts the viscosity and temperature range parameters by selecting liquid crystal materials with appropriate molecular structures and by optimizing the composition ratio of components. The polymerizable compound with specific molecular weight and structure helps achieve low viscosity while maintaining a wide nematic phase temperature range.
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 compound achieves a wide temperature range, short response time, high voltage holding ratio, and long service life for liquid crystal display devices, reducing production costs by eliminating the need for an alignment film and improving the alignment of liquid crystal molecules.
Implementation Method 1
A polymerizable polar compound with an itaconate group is introduced, which forms a network structure upon polymerization
Implementation Method 2
a liquid crystal composition that contains the compound and has positive or negative dielectric anisotropy
Data Source
AI summary
A polar compound having high chemical stability, high capability of aligning liquid crystal molecules, high solubility in a liquid crystal composition, and a large voltage holding ratio when the compound is used in a liquid crystal display device; and a composition containing the compound. The compound is represented by formula (1). In formula (1), for example, P1 is a group represented by any one of formulas (1b) to (1i), P2 is a group represented by formula (1d), Sp1 and Sp2 are a single bond, Z1, Z2, Z3, Z4 and Z5 are —COO—, and ring A1, ring A2, ring A3 and ring A4 are 1,4-phenylene: