Photoalignment Polymers for Liquid Crystal Orientation
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Solution Overview
Problem
Current methods for aligning liquid crystal materials often suffer from disadvantages such as dirt pickup and corruption, particularly with physical alignment techniques, and lack the ability to define distinct areas with different alignment directions effectively.
Innovation Solution
Development of polymers with specific monomer units that can be remotely aligned using electromagnetic radiation, as represented by Formula (I), which includes aryl or heteroaryl rings and various hydrocarbyl groups, allowing for the creation of alignment layers that can orient liquid crystals without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical alignment methods are used to align liquid crystal materials, then alignment can be achieved, but dirt pickup and corruption such as tearing occur
Solution Approach 1:
The patent replaces physical/mechanical alignment methods with remote alignment methods using electromagnetic radiation. The alignment layer contains polymers with photoalignment properties that enable alignment through light exposure without physical contact, thereby eliminating dirt pickup and tearing associated with rubbing methods
Solution Approach 2:
The patent introduces an alignment layer containing polymers with photoalignment properties as an intermediary between the substrate and liquid crystal materials. This alignment layer enables remote alignment through electromagnetic radiation while protecting the liquid crystal materials from direct physical contact that would cause contamination
2Object-affected harmful factors
If remote alignment methods are used to align liquid crystal materials, then dirt pickup and corruption are avoided, but the ability to define distinct areas with different alignment directions is limited
Solution Approach 1:
The patent enables different regions of the alignment layer to have different alignment properties by incorporating monomers with different photoalignment characteristics. This allows distinct areas to be defined with different alignment directions through selective exposure to electromagnetic radiation, while maintaining the benefits of remote alignment
Solution Approach 2:
The patent creates dynamically reconfigurable alignment patterns by using polymers that can be aligned in different directions through controlled exposure to electromagnetic radiation. The alignment direction and pattern can be adjusted by modifying the radiation exposure parameters, enabling versatile definition of distinct areas
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 polymers enable remote alignment of liquid crystal materials, avoiding the drawbacks of physical alignment methods and allowing for precise control of alignment directions, enhancing the performance and reliability of liquid crystal layers in applications like optical elements.
Implementation Method 1
Alignment of the liquid crystal materials can be achieved by contact of the liquid crystal containing layer with an underlying alignment layer that includes alignment materials, such as polymers that can be aligned. Orientation of the alignment layer can be achieved by physical methods, such as rubbing, and/or remote methods, such as exposure to electromagnetic radiation.
Data Source
AI summary
The present invention relates to polymers that include residues of at least one monomer represented by the following Formula (I). With reference to Formula (I), at least one of E1 and E2 independently is, or is independently substituted with, at least one reactive group, such as a (meth)acryloyl group. Monomers represented by Formula (I) and monomer residues thereof have alignment properties, such as photoalignment properties. The present invention also relates to alignment layers that include such polymers, and articles of manufacture, such as optical elements, that include one or more such alignment layers.