Liquid Crystal Display Polymer Alignment Layer
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving high-speed response characteristics, low-voltage driving, wide viewing angles, and wide operation temperature ranges, with existing methods requiring complex processes like polyimide alignment layers and rubbing procedures, which complicate manufacturing and lead to afterimage issues.
Innovation Solution
A liquid crystal display structure that omits the polyimide alignment layer by using polymer layers formed from compounds represented by Chemical Formula 1, which include reactive mesogens and vertical alignment groups, allowing for hydrogen bonding to substrates and simplifying the manufacturing process, and includes protrusions to align liquid crystal molecules and reduce afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyimide alignment layers and rubbing procedures are used, then alignment of liquid crystal molecules is achieved, but manufacturing complexity increases and afterimage issues occur
Solution Approach 1:
The patent removes the polyimide alignment layer from the liquid crystal display structure. Instead of using conventional polyimide alignment layers requiring rubbing procedures, the invention uses a polymer layer formed from compounds of Chemical Formula 1 that self-align liquid crystal molecules without requiring the complex polyimide rubbing process, thereby simplifying manufacturing while maintaining alignment quality
Solution Approach 2:
The patent changes the chemical composition and properties of the alignment layer by using compounds of Chemical Formula 1 with specific functional groups (carboxyl, hydroxyl, or amino groups) that enable hydrogen bonding. This chemical parameter change allows the polymer layer to achieve effective alignment without the mechanical rubbing process required for polyimide layers
2Reliability
If polyimide alignment layers are used, then liquid crystal molecule alignment is achieved, but afterimage characteristics deteriorate
Solution Approach 1:
The patent changes the chemical composition of the alignment layer by using compounds of Chemical Formula 1 with specific functional groups (carboxyl, hydroxyl, or amino groups) that enable hydrogen bonding. This chemical parameter change allows the polymer layer to achieve effective alignment without the mechanical rubbing process required for polyimide layers, and simultaneously improves afterimage characteristics
Solution Approach 2:
The patent uses a composite approach by combining the polymer layer formed from Chemical Formula 1 compounds with protrusions containing reactive mesogens. This composite structure provides both alignment functionality and improved afterimage characteristics, overcoming the limitations of conventional polyimide alignment layers
3Ease of manufacture
If conventional alignment layers are used, then manufacturing is possible, but response speed is insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the alignment layer by using a polymer layer formed from compounds of Chemical Formula 1 with specific functional groups. This parameter change enables the layer to provide effective alignment while allowing for enhanced response speed through improved liquid crystal molecule orientation, achieving both manufacturing feasibility and performance improvement
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
This approach enhances the response speed of liquid crystal displays, reduces afterimage characteristics, and simplifies the manufacturing process by eliminating the need for polyimide alignment layers and rubbing procedures, while maintaining effective alignment with a reduced amount of alignment polymer.
Implementation Method 1
irradiating an ultraviolet (UV) light to the first substrate and the second substrate
Implementation Method 2
the first polymer layer and the second polymer layer include a polymer of a compound represented by Chemical Formula 1
Data Source
AI summary
The present invention provides a liquid crystal display including: a first substrate; a second substrate configured to be separated from and overlap the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate and including liquid crystal molecules; a first polymer layer disposed between the first substrate and the liquid crystal layer; a second polymer layer disposed between the second substrate and the liquid crystal layer; and a plurality of protrusions disposed in at least one of a first position between the first polymer layer and the liquid crystal layer and a second position between the second polymer layer and the liquid crystal layer, in which the protrusions include polymers of reactive mesogens, and the first polymer layer and the second polymer layer include a polymer of a compound represented by Chemical Formula 1.