Liquid Crystal Composition with Self-Alignment for Stain-Free Manufacturing
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Solution Overview
Problem
Liquid crystal displays face challenges in manufacturing due to drip stains and require additional alignment layers, which complicate the process and are not always effective in achieving desired characteristics like low-voltage driving, wide viewing angles, and temperature stability.
Innovation Solution
A liquid crystal composition incorporating specific compounds such as Formula 1-1, Formula 1-2, Formula 2-1, Formula 2-2, Formula 3-1, Formula 3-2, Formula 3-3, and Formula 3-5, which provide negative dielectric anisotropy and self-alignment properties, eliminating the need for an additional alignment layer by ensuring uniform spreading and preventing stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an additional alignment layer is used to align liquid crystal molecules, then alignment precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the separate alignment layer from the display device structure by incorporating alignment-inducing functional groups directly into the liquid crystal molecule structures. This removes the need for the additional alignment layer while maintaining the alignment function, thereby reducing device complexity and manufacturing steps.
Solution Approach 2:
The liquid crystal compounds in the patent serve multiple functions simultaneously: they provide the liquid crystal phase for optical modulation and contain built-in alignment-inducing groups that perform the alignment function. This multi-functionality eliminates the need for separate alignment layers, reducing device complexity while maintaining alignment precision.
2Ease of manufacture
If conventional liquid crystal compositions are used, then manufacturing process is simpler, but drip stains are generated in the liquid crystal layer
Solution Approach 1:
The patent changes the chemical parameters of the liquid crystal composition by incorporating specific compounds with fluorinated groups and alignment-inducing structures. These parameter changes in molecular structure prevent drip stain formation while maintaining ease of manufacture through direct injection filling without requiring additional processing steps.
Solution Approach 2:
The patent converts the potential harm of liquid crystal material properties into a benefit by designing molecules that inherently prevent drip stains. The specific molecular structures with fluorinated groups and alignment-inducing moieties transform the material properties to eliminate the harmful drip stain effect while maintaining manufacturing simplicity.
3Reliability
If additional alignment layers are added to achieve desired characteristics, then alignment performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the alignment function with the liquid crystal material itself by incorporating alignment-inducing functional groups into the liquid crystal molecule structures. This consolidation eliminates the need for separate alignment layers and their associated manufacturing steps, reducing manufacturing time while maintaining alignment performance.
Solution Approach 2:
The alignment capability is built into the liquid crystal compounds before the liquid crystal layer is assembled. The alignment-inducing groups are pre-incorporated into the molecular structures, so the alignment function is already present in the material itself, eliminating the need for subsequent alignment layer deposition and associated manufacturing steps.
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 composition effectively reduces drip stains, simplifies manufacturing, and enhances display performance by aligning liquid crystal molecules without an additional alignment layer, achieving desired optical and electrical properties.
Implementation Method 1
at least one compound selected from the group consisting of a self-alignment compound expressed by Formula 2-1 and a self-alignment compound expressed by Formula 2-2
Implementation Method 2
the liquid crystal composition has negative dielectric anisotropy
Implementation Method 3
at least one compound selected from the group consisting of a reactive mesogen expressed by Formula 3-1, a reactive mesogen expressed by Formula 3-2, a reactive mesogen expressed by Formula 3-3, a reactive mesogen expressed by Formula 3-4, and a reactive mesogen expressed by Formula 3-5
Data Source
AI summary
Disclosed is a liquid crystal composition including at least one compound selected from the group consisting of a liquid crystal compound expressed by Formula 1-1 and a liquid crystal compound expressed by Formula 1-2; at least one compound selected from the group consisting of a self-alignment compound expressed by Formula 2-1 and a self-alignment compound expressed by Formula 2-2; and at least one compound selected from the group consisting of a reactive mesogen expressed by Formula 3-1, a reactive mesogen expressed by Formula 3-2, a reactive mesogen expressed by Formula 3-3, a reactive mesogen expressed by Formula 3-4, and a reactive mesogen expressed by Formula 3-5. The liquid crystal composition also has negative dielectric anisotropy.