Liquid Crystal Aligning Layer Copolymer Thermal Stability
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Solution Overview
Problem
Existing liquid crystal display technologies face challenges with thermal stability and residual images in contactless alignment processes, and previous solutions either lack thermal stability or suffer from poor alignment and residual image issues.
Innovation Solution
A copolymer for liquid crystal alignment incorporating a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group is developed, which is used to create a liquid crystal aligning layer that exhibits excellent thermal stability and no residual images, achieved through radical copolymerization and specific composition ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a contactless-type aligning layer (photo alignment process) is used to avoid dust and ESD problems, then convenience of the process is improved, but thermal stability is significantly reduced and residual images are maintained for a long time
Solution Approach 1:
The patent uses a composite material system consisting of coumarin polymer (for photoreactive alignment), polyimide (for thermal stability), and silane crosslinking agent (for network formation). This composite structure combines the advantages of contactless alignment with improved thermal stability and reduced residual images.
Solution Approach 2:
The patent changes the chemical parameters of the aligning layer by introducing crosslinkable functional groups (silane groups) that form a three-dimensional network structure. This parameter change enhances the thermal stability and reduces residual image effects while maintaining the photoalignment functionality.
2Reliability
If coumarin and quinolinol derivatives with photoreactive ethen group are used to improve thermal stability, then thermal stability is improved, but residual images are very easily formed
Solution Approach 1:
The patent modifies the molecular structure by adding crosslinkable functional groups (silane groups) to the coumarin polymer backbone. This structural parameter change creates a three-dimensional crosslinked network that prevents the formation of residual images while maintaining thermal stability.
Solution Approach 2:
The patent creates a composite system where coumarin polymer provides photoreactive alignment, polyimide provides thermal stability, and silane crosslinking creates a stable three-dimensional network. This composite structure eliminates residual images while preserving the beneficial properties of each component.
3Object-generated harmful factors
If a liquid crystal aligning layer mixed with thermosetting resin or having functional group capable of being thermally cured is used to avoid residual images, then residual images are avoided, but alignment and thermal stability are poor
Solution Approach 1:
The patent uses a composite material system where coumarin polymer provides photoreactive alignment, polyimide provides thermal stability, and silane crosslinking creates a stable network. This composite structure achieves all three goals: no residual images, good alignment, and excellent thermal stability.
Solution Approach 2:
The patent applies different functional groups at different locations within the polymer structure: coumarin groups at the ends for photoreactive alignment, polyimide backbone for thermal stability, and silane groups for crosslinking. This local differentiation of functionality achieves multiple objectives simultaneously.
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 copolymer-based liquid crystal aligning layer provides superior thermal stability and eliminates residual images, making it suitable for liquid crystal displays with improved performance.
Implementation Method 1
achieved through radical copolymerization and specific composition ratios
Implementation Method 2
a copolymer for liquid crystal alignment including a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group
Implementation Method 3
a copolymer for liquid crystal alignment including a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group
Implementation Method 4
a copolymer for liquid crystal alignment including a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group
Implementation Method 5
a copolymer for liquid crystal alignment including a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group
Data Source
AI summary
Disclosed is a copolymer for liquid crystal alignment having a photoreactive group, a mesogen group, a thermosetting group, and a crosslinking group, a liquid crystal aligning layer including the copolymer for liquid crystal alignment, and a liquid crystal display including the liquid crystal aligning layer. Since the liquid crystal aligning layer has excellent thermal stability and no residual image, the liquid crystal aligning layer is usefully applied to the liquid crystal display.