Reactive Mesogen Alignment Layer for Liquid Crystal Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal displays face challenges in forming stable alignment layers for vertical alignment mode liquid crystal displays, particularly in aligning liquid crystal molecules in a predetermined direction without applying an electric field, as current methods like rubbing and photo-aligning have limitations in terms of viewing angle and contrast ratio.
Innovation Solution
A novel reactive mesogen is introduced, represented by specific chemical formulas, which includes a tertiary amine anchoring group and polymerizable units, allowing for stable alignment of liquid crystal molecules by forming an alignment layer that can vertically align liquid crystals with respect to substrates, improving solubility and bonding energy with electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubbing method or photo-aligning method is used to align liquid crystal molecules, then alignment layer formation is achieved, but viewing angle and contrast ratio are limited
Solution Approach 1:
The patent changes the chemical parameters of the alignment layer by introducing reactive mesogens with specific molecular structures (containing mesogenic groups, anchoring groups, and polymerizable groups) that can form stable alignment layers through photopolymerization, thereby improving viewing angle and contrast ratio while maintaining alignment stability
Solution Approach 2:
The patent uses composite materials by combining reactive mesogens with liquid crystal compounds in a liquid crystal composition, where the reactive mesogen forms a stable alignment layer through photopolymerization while the liquid crystal compound provides the necessary optical properties, achieving both stable alignment and improved display performance
2Illumination intensity
If reactive mesogen is used to form alignment layer, then viewing angle and contrast ratio are improved, but alignment layer stability may be compromised
Solution Approach 1:
The patent uses reactive mesogens that undergo photopolymerization to form stable alignment layers. The reactive mesogen molecules act as temporary structures during the formation process and then transform into stable crosslinked networks through photopolymerization, ensuring long-term stability of the alignment layer while maintaining improved viewing angle and contrast ratio
Solution Approach 2:
The patent modifies the chemical state of the alignment layer from monomeric reactive mesogens to polymeric crosslinked structures through photopolymerization, changing the physical and chemical parameters to achieve both high stability and improved optical performance
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 reactive mesogen enhances the formation of stable alignment layers, improving the display quality by maintaining a high voltage holding ratio and maintaining alignment stability, thereby increasing the viewing angle and contrast ratio of liquid crystal displays.
Implementation Method 1
a reactive mesogen configured to form a liquid crystal alignment layer in a liquid crystal display
Implementation Method 2
liquid crystal molecules are characterized in aligning in a pre-determined direction, and the longitudinal axes thereof are vertically aligned with respect to a substrate surface
Data Source
AI summary
Provided are a reactive mesogen that may improve display quality of a liquid crystal display, and a liquid crystal composition including the same. The reactive mesogen is represented by the following Formula:BZ1b1XZ2b2Pawhere X, Z1, Z2, B, and Pa are specified in the disclosure, and each of b1 and b2 is independently an integer between 0 to 6, inclusive.