Fluoro-Modified Liquid Crystal Reactive Monomer for Uniform ODF Deposition
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Solution Overview
Problem
The traditional one-drop filling technology for liquid crystal panels results in uneven deposition of reactive monomers on the alignment film, leading to the phenomenon of drop Mura defect, especially when the cell gap is smaller than 3.8 μm, due to excessive interaction between the reactive monomers and the polyimide surface, causing defects in the finished product.
Innovation Solution
A reactive monomer of liquid crystal containing a fluoro group (F—) is introduced to reduce interaction with the polyimide surface, utilizing a molecular formula such as C20H(18-n)FnO4, where n is greater than or equal to 1, to create a fluorophobic effect and ensure even deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional reactive monomers are used in one-drop filling technology, then the liquid crystal can be filled efficiently, but the reactive monomers deposit unevenly on the polyimide surface causing drop Mura defect
Solution Approach 1:
The patent modifies the molecular structure of reactive monomers by introducing fluoro groups (—CF3, —CHF2, —CH2F, or —CH=CF2) at specific positions in the molecular formula. This chemical parameter change reduces the interaction between reactive monomers and polyimide surface, preventing excessive deposition and achieving uniform distribution while maintaining filling efficiency
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining modified reactive monomers containing fluoro groups with liquid crystal compounds. This composite material exhibits both good dispersibility on polyimide surface and appropriate interaction strength, resolving the contradiction between filling efficiency and deposition uniformity
2Reliability
If the cell gap is reduced to smaller than 3.8 μm, then the liquid crystal panel achieves better performance, but the traditional reactive monomers cannot disperse widely causing increased drop Mura defect
Solution Approach 1:
By introducing fluoro groups with specific molecular weights and interaction characteristics, the patent changes the physical and chemical parameters of reactive monomers. This enables the modified monomers to maintain wide dispersibility even in small cell gaps (≤3.8 μm), ensuring uniform deposition and preventing drop Mura defect while achieving the desired panel performance
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 fluoro group in the reactive monomer reduces the interaction with the polyimide surface, preventing drop Mura defects and allowing for even dispersion of the liquid crystal composition, even at smaller cell gaps, thereby improving the quality of the liquid crystal panels.
Implementation Method 1
a fluorophobic effect will be generated between the reactive monomer of liquid crystal and hydrocarbon bonds of a side chain of a polyimide surface of an alignment film
Data Source
AI summary
The present invention discloses a reactive monomer of liquid crystal. The reactive monomer of liquid crystal is added with at least one fluoro group. Because hydrocarbon bonds of a side chain of polyimide surface of an alignment film has a fluorophobic effect, the fluoro group of the reactive monomer of liquid crystal can lower the interaction between the polyimide surface of the alignment film and the reactive monomer of liquid crystal to thus evenly deposit the liquid crystal composition containing the reactive monomers of liquid crystal onto the polyimide surface of the alignment film. Thus, it can avoid from occurring the phenomenon of drop Mura defect occurred during implementing the ODF technology.