Photoalignment Compounds for Liquid Crystal Display Alignment
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Solution Overview
Problem
Current methods for aligning liquid crystal materials, such as physical rubbing, suffer from drawbacks like dirt pickup and tearing, while remote alignment methods like electromagnetic radiation exposure are desirable but lacking in effective compounds with alignment properties.
Innovation Solution
Development of compounds represented by Formula (I), which can be used to prepare alignment materials like polymers, exhibiting photoalignment properties that allow for remote alignment through exposure to electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical alignment methods such as rubbing are used, then alignment of liquid crystal materials can be achieved, but dirt pickup and tearing of the alignment layer occur
Solution Approach 1:
The patent replaces the mechanical rubbing method with a photoalignment method using electromagnetic radiation. The alignment layer contains compounds with photoalignment properties that enable remote alignment without physical contact, thereby eliminating dirt pickup and tearing while maintaining effective liquid crystal alignment.
Solution Approach 2:
The patent introduces an alignment layer containing photoalignment compounds as an intermediary between the substrate and liquid crystal materials. This intermediary enables remote alignment through electromagnetic radiation absorption and molecular reorientation, avoiding direct mechanical contact that causes damage.
2Object-affected harmful factors
If remote alignment methods using electromagnetic radiation are used, then dirt pickup and tearing are avoided, but effective compounds with alignment properties were previously lacking
Solution Approach 1:
The patent modifies molecular parameters by incorporating specific photoalignment groups (such as cinnamyl, coumarin, or stilbene groups) into the alignment layer compounds. These structural modifications enable the compounds to absorb electromagnetic radiation and undergo controlled molecular reorientation, providing the previously lacking effective photoalignment capability.
Solution Approach 2:
The patent creates composite alignment materials by combining photoalignment compounds with polymer matrices. This composite structure provides both the photoalignment functionality (from the specialized compounds) and the structural integrity needed for practical application, making remote alignment methods manufacturably viable.
3Manufacturing precision
If physical rubbing methods are used for alignment, then alignment direction can be defined, but the process is contact-based and causes contamination
Solution Approach 1:
The patent substitutes the mechanical rubbing process with a photochemical alignment process. Electromagnetic radiation activates the photoalignment compounds in the alignment layer, causing molecular reorientation that defines the alignment direction without any physical contact, thereby eliminating contamination sources.
Solution Approach 2:
The alignment layer compounds perform self-alignment through photoinduced molecular reorientation. When exposed to electromagnetic radiation, the compounds automatically orient themselves to define the alignment direction, eliminating the need for external mechanical rubbing and the associated contamination risks.
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
These compounds enable efficient and clean alignment of liquid crystal materials, avoiding the disadvantages of physical methods and allowing for distinct area definitions with different alignment directions using remote electromagnetic radiation.
Implementation Method 1
compounds that have alignment properties, such as photoalignment properties
Implementation Method 2
exposure to electromagnetic radiation can be advantageously used to define distinct areas across the alignment layer having different alignment directions
Data Source
AI summary
The present invention relates to compounds 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. The compounds of the present invention can be used alone and/or in combination with polymers prepared from such compounds, such as to form or as one or more components of an alignment layer.