Liquid Crystal Display Alignment Film Anchoring Force
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Solution Overview
Problem
Existing LCD panel manufacturing methods result in alignment films with poor reliability due to weak anchoring forces between polymer chains and liquid crystal molecules, leading to inconsistent display performance.
Innovation Solution
A method involving the coating of isotropic alignment films on substrates, followed by pre-baking, high-temperature baking, linearly polarized ultraviolet irradiation, drop-filling with thermally reactive monomer-doped liquid crystals, and heat-curing to form polymers on the alignment film surface, enhancing the anchoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photo-alignment method is used to produce alignment film, then alignment directionality is improved, but anchoring force to liquid crystal molecules deteriorates
Solution Approach 1:
The alignment film is constructed as a composite material system combining polymer chains (for alignment directionality through photo-alignment) with silane groups (for enhanced anchoring force through chemical bonding with liquid crystal molecules). This composite structure allows simultaneous achievement of both alignment precision and reliable anchoring.
Solution Approach 2:
The chemical composition parameters of the alignment film are changed by introducing silane groups into the polymer structure. This parameter change transforms the alignment film from a simple polymer coating to a chemically active composite that can form strong bonds with liquid crystal molecules while maintaining photo-alignment capabilities.
2Ease of manufacture
If chemical force only is used for anchoring, then manufacturing process is simplified, but reliability of alignment film deteriorates
Solution Approach 1:
The chemical composition of the alignment film is modified by incorporating silane groups that can form strong chemical bonds with liquid crystal molecules. This parameter change in material composition enables enhanced anchoring force while maintaining the simplicity of the photo-alignment manufacturing process.
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 method significantly improves the reliability of the alignment film by increasing the anchoring force, leading to more consistent and reliable liquid crystal display performance.
Implementation Method 1
the isotropic alignment film is irradiated by an ultraviolet linearly polarized light, so that the chemical reaction of the isotropic alignment film occurs to transform into an anisotropy
Implementation Method 2
making the thermal reactive monomers in the liquid crystal molecules into a polymer on the surface of the alignment film
Implementation Method 3
pre-baking the alignment film, so that the alignment film has a uniform thickness, and volatizing an organic solvent in the alignment film
Data Source
AI summary
A method for manufacturing a liquid crystal display panel is provided. The method includes the following steps of: drop-filling liquid crystal molecules on a color film substrate having a seal frame, wherein the liquid crystal molecules are doped with thermal reactive monomers; and heat-curing a frame, and simultaneously making the thermal reactive monomers in the liquid crystal molecules into a polymer on the surface of the alignment film. The reliability of the alignment film is improved by the present invention.