Ligand-Modified Quantum Dot Polymer Film for LCD Alignment
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Solution Overview
Problem
Current liquid crystal display panels face issues with alignment film materials like polyimide (PI), which cause dust, electrostatic problems, high polarity, water absorption, and high costs, while also limiting the quality of liquid crystal alignment and panel performance due to limited material characteristics and complex film formation processes.
Innovation Solution
A ligand-modified quantum dot material that polymerizes with a polymerizable monomer to form a polymer film, replacing the PI alignment film, simplifying the alignment process, reducing costs, and enhancing display quality by embedding quantum dots in the polymer film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyimide (PI) alignment film is used to arrange liquid crystal molecules, then liquid crystal alignment is achieved, but dust particles, residual electrostatic, and brush marks occur reducing process yield
Solution Approach 1:
The patent extracts and eliminates the PI alignment film from the liquid crystal display structure, replacing it with a self-aligning liquid crystal composition that inherently orients liquid crystal molecules without requiring a separate alignment film layer, thereby removing the source of dust, electrostatic, and brush mark problems
Solution Approach 2:
The liquid crystal composition serves multiple functions simultaneously: it acts as both the functional liquid crystal material and the alignment-inducing layer, eliminating the need for a separate PI alignment film while maintaining liquid crystal orientation capabilities
2Object-generated harmful factors
If optical alignment PI material is used to avoid dust and electrostatic problems, then alignment quality improves, but material characteristics are limited, heat resistance and aging resistance are poor
Solution Approach 1:
The patent removes the PI alignment film entirely and replaces it with a liquid crystal composition-based alignment system, eliminating the inherent limitations of PI materials regarding heat resistance and aging resistance while maintaining alignment functionality
3Ease of operation
If PI material is used for alignment, then liquid crystal molecules can be arranged, but PI material has high polarity and high water absorption causing deterioration and uneven alignment
Solution Approach 1:
The patent extracts and eliminates the hygroscopic PI alignment film, replacing it with a liquid crystal composition that does not exhibit high water absorption or polarity-related deterioration, ensuring stable and uniform alignment over time
Solution Approach 2:
The patent changes the fundamental parameter of the alignment layer from a polyimide polymer material to a liquid crystal composition, fundamentally altering the material properties to eliminate high polarity and water absorption characteristics while maintaining alignment functionality
4Ease of operation
If PI alignment film is used, then liquid crystal alignment is achieved, but the process of forming a film on the TFT-LCD is complex increasing panel cost
Solution Approach 1:
The patent extracts and eliminates the complex multi-step PI film formation process (including coating, drying, and rubbing or photoalignment steps), replacing it with a simplified process where the liquid crystal composition is directly applied and self-organizes to provide alignment functionality
Solution Approach 2:
The patent merges the alignment function with the liquid crystal composition itself, combining what were previously separate components (alignment film and liquid crystal material) into a single integrated system, thereby simplifying the overall process
5Illumination intensity
If quantum dots are added to liquid crystal material, then luminescence performance is enhanced, but uneven diffusion and precipitation occur reducing luminescence efficiency
Solution Approach 1:
The patent creates a composite liquid crystal composition where quantum dots are integrated into the liquid crystal matrix with specific interactions that prevent aggregation and precipitation, ensuring uniform distribution and stable luminescence performance
Solution Approach 2:
The patent modifies parameters of the liquid crystal composition (such as viscosity, molecular structure, or additive composition) to optimize quantum dot dispersion and prevent precipitation, thereby maintaining uniform distribution and high luminescence efficiency
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 solution improves liquid crystal alignment, prevents impurity diffusion, and increases light source utilization, achieving higher purity color and lower power consumption with a simpler and more cost-effective fabrication process.
Implementation Method 1
a ligand-modified quantum dot material, which can occur a polymerization with a polymerizable monomer to form a polymer
Implementation Method 2
The quantum dot with its excellent luminescence performance such as narrow luminescence peak, tunable luminescence band, high inner quantum efficiency
Data Source
AI summary
The present application provides a ligand-modified quantum dot material, a method of fabricating a liquid crystal display panel, and a liquid crystal display panel. The ligand-modified quantum dot material of the present application can occur a polymerization with the ligand-modified quantum dot material under ultraviolet irradiation to form a polymer, while the polymer deposits on a substrate to form a polymer film, which can replace the PI alignment film, so that an alignment process of liquid crystal is simplified, and a cost is economized; simultaneously, display quality of a liquid crystal display panel can be improved by the quantum dots anchored in the polymer film. The method of fabricating the liquid crystal display panel of the present application eliminates the fabricating process of the PI alignment film, the method has simple process and low cost, and a liquid crystal display panel obtained thereby has better display quality. The liquid crystal display panel of the present application utilizes the polymer film, which is obtained by polymerizing the ligand-modified quantum dot material and a polymerizable monomer, to replace the PI alignment film, so as to greatly enhance quality of the panel, and to have a low fabricating cost.