Polymerizable Compound for Vertical Alignment in Liquid Crystal Displays
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Solution Overview
Problem
Existing liquid crystal display technologies face challenges in achieving stable vertical alignment of liquid crystal molecules without the use of a polyimide alignment layer, which is costly, and the electro-optical characteristics of current spontaneously aligning additive agents are unsatisfactory in terms of alignment regulation and storage stability.
Innovation Solution
A polymerizable compound with a specific chemical structure, represented by the general formula (i), is introduced to align liquid crystal molecules vertically without a polyimide layer, providing high storage stability and reliable alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyimide alignment layer is used to achieve vertical alignment of liquid crystal molecules, then alignment quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the polyimide alignment layer from the liquid crystal display structure and replaces it with a spontaneously aligning additive agent incorporated into the liquid crystal composition. This extraction eliminates the costly alignment layer fabrication process while maintaining vertical alignment functionality through the additive agent's spontaneous alignment properties
Solution Approach 2:
The patent introduces a spontaneously aligning additive agent as an intermediary substance within the liquid crystal composition. This additive agent mediates the alignment process by interacting with liquid crystal molecules to induce vertical alignment without requiring a separate polyimide alignment layer, thus reducing manufacturing cost while preserving alignment quality
2Ease of manufacture
If a spontaneously aligning additive agent is used to replace the polyimide layer, then manufacturing cost is reduced, but electro-optical characteristics and storage stability deteriorate
Solution Approach 1:
The patent modifies the molecular structure of the spontaneously aligning additive agent by introducing specific structural features (such as rigid rod-like cores, terminal groups, and spacer lengths) to optimize its electro-optical characteristics and storage stability. These parameter changes in the additive agent's molecular structure enable it to maintain vertical alignment capability while improving overall performance
Solution Approach 2:
The patent develops a composite liquid crystal composition that combines the spontaneously aligning additive agent with carefully selected liquid crystal compounds and modifiers. This composite formulation enhances the electro-optical characteristics and storage stability of the system while maintaining the cost advantage of eliminating the polyimide alignment layer
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 polymerizable compound ensures stable vertical alignment of liquid crystal molecules, improves alignment stability, and maintains low-temperature storage stability, reducing concerns about residual monomers and transmissivity, while eliminating the need for a polyimide layer.
Implementation Method 1
a liquid crystal medium based on a polar compound mixture with negative dielectric anisotropy containing at least one spontaneously aligning additive agent
Implementation Method 2
a liquid crystal medium based on a polar compound mixture with negative dielectric anisotropy
Data Source
AI summary
The present invention provides a compound represented by the general formula (i), which has a partial structure Ki1 represented by one of the general formulae (K-1) to (K-6) and has a ring B with at least one P-Sp- group and with at least one Ri2 (Ri2 denotes a linear or branched alkyl group having 2 to 10 carbon atoms or a linear or branched halogenated alkyl group having 2 to 10 carbon atoms, —CH2— in the alkyl or halogenated alkyl group is optionally substituted with —CH═CH—, —O—, —COO—, or —OCO—, but —O— is not adjacent to another —O—). Thus, the compound in a liquid crystal composition adsorbs to substrates between which the liquid crystal composition (a liquid crystal layer) exists. The compound can hold vertically aligned liquid crystal molecules, can improve alignment stability, and can ensure low-temperature storage stability.