Liquid Crystal Alignment Layer with Reactive Mesogen
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving superior thermal stability, which affects the alignment and performance of liquid crystals under varying temperature conditions.
Innovation Solution
Incorporating a reactive mesogen represented by Chemical Formula 1 and vertical aligners in the liquid crystal alignment layers, along with a polymerization initiator, to enhance thermal stability and control the alignment of liquid crystals between substrates, allowing for vertical alignment and inclination adjustments through electric field manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alignment layers are used, then the liquid crystal display can be manufactured with standard materials, but the thermal stability of the alignment layer is insufficient under varying temperature conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the alignment layer by incorporating reactive mesogens with specific molecular structures (Chemical Formulas 1-4) that have enhanced thermal stability. The reactive mesogen contains a mesogenic group, reactive group, and anchor group with specific structural parameters that maintain alignment properties across a wide temperature range, resolving the contradiction between thermal stability and temperature adaptability.
Solution Approach 2:
The alignment layer is formulated as a composite material containing reactive mesogens combined with conventional liquid crystal alignment materials. This composite structure leverages the thermal stability of the reactive mesogen while maintaining the alignment functionality of conventional materials, achieving both improved thermal stability and continued adaptability to temperature variations.
2Reliability
If reactive mesogen is incorporated in the alignment layer, then thermal stability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The reactive mesogen is pre-synthesized and characterized before being incorporated into the alignment layer formulation. The molecular structure and reactivity of the reactive mesogen are predetermined and optimized, allowing the alignment layer to be manufactured by simply mixing the pre-characterized reactive mesogen with conventional alignment materials, thereby minimizing manufacturing complexity while achieving improved thermal stability.
3Manufacturing precision
If vertical aligners are added to achieve vertical alignment, then alignment control is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the functions of thermal stabilization and vertical alignment into a single integrated component - the reactive mesogen. The reactive mesogen simultaneously provides thermal stability through its molecular structure and induces vertical alignment through its anchor group interaction with liquid crystal molecules, eliminating the need for separate vertical aligner components and simplifying the overall alignment layer structure.
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 solution provides improved thermal stability and alignment control of liquid crystals, ensuring consistent display performance across temperature variations and extending the lifespan of the liquid crystal display.
Implementation Method 1
irradiating ultraviolet rays toward at least one of the first substrate and the second substrate while an electric field is applied, wherein the liquid crystal composition include a reactive mesogen
Implementation Method 2
irradiating ultraviolet rays toward at least one of the first substrate and the second substrate while an electric field is applied
Data Source
AI summary
A liquid crystal display includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a first liquid crystal alignment layer disposed between the liquid crystal layer and the first substrate, and a second liquid crystal alignment layer disposed between the liquid crystal layer and the second substrate, wherein at least one of the first liquid crystal alignment layer and the second liquid crystal alignment layer includes a reactive mesogen.