Amide Monomer Polymer Layer for LCD High Humidity Stability
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Solution Overview
Problem
Liquid crystal display devices experience stains and display unevenness when used in high temperature and high humidity environments due to water penetration and impurity elution from sealing materials, leading to reduced display quality.
Innovation Solution
A liquid crystal composition containing a radical polymerizable monomer with an amide group is used, which forms a polymer layer by ultraviolet irradiation, effectively binding water and impurities through strong dipole-dipole interactions and hydrogen bonding, preventing their presence in the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compositions are used in high temperature and high humidity environments, then water penetration and impurity elution occur from sealing materials, but display quality deteriorates due to stains and display unevenness
Solution Approach 1:
The patent introduces a polymer layer as an intermediary substance between the liquid crystal and the sealing material. This polymer layer acts as a mediator that captures and immobilizes water and impurities eluting from the sealing material, preventing them from directly affecting the liquid crystal display quality. The polymer layer serves as a buffer zone that intercepts harmful substances before they can cause stains or display unevenness.
Solution Approach 2:
The patent converts the harmful effect of water and impurity elution into a beneficial outcome by designing the polymer layer to specifically capture these substances. Instead of trying to completely prevent water and impurity elution, the invention allows them to occur but redirects their path by having the polymer layer absorb and immobilize them, thereby transforming a harmful phenomenon into a controlled process that actually protects the display quality.
2Manufacturing precision
If a polymer layer is formed to control liquid crystal orientation, then alignment control improves, but water and impurities may accumulate in the polymer layer causing stains
Solution Approach 1:
The polymer layer serves as an intermediary that deliberately accumulates impurities away from the liquid crystal. By positioning the polymer layer between the sealing material and the liquid crystal, it acts as a trap for water and impurities, preventing them from reaching the liquid crystal while still allowing the polymer to provide alignment control functions.
Solution Approach 2:
The patent applies local quality by creating a specific region (the polymer layer) with different properties from the surrounding areas. This localized polymer region has the dual function of providing alignment control where needed while simultaneously serving as an impurity collection zone. The polymer layer's composition and structure are specifically designed to have high affinity for water and impurities in this local region, preventing their spread to other areas.
3Manufacturing precision
If photo-alignment film is used to provide alignment regulation, then orientation control improves, but light irradiation generates impurity ions that decrease voltage holding ratio
Solution Approach 1:
The patent introduces the polymer layer as an intermediary that captures impurity ions generated during light irradiation of the photo-alignment film. Instead of allowing these impurity ions to directly enter the liquid crystal and decrease voltage holding ratio, the polymer layer intercepts them and immobilizes them within its structure, protecting the liquid crystal from their harmful effects.
Solution Approach 2:
The patent converts the harmful byproduct of light irradiation (impurity ion generation) into a beneficial outcome by having the polymer layer specifically capture these ions. The impurity ions that would normally degrade display performance are instead redirected into the polymer layer, where they are harmlessly immobilized. This transforms a harmful side effect of the alignment process into a controlled phenomenon that actually protects the liquid crystal.
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 maintains high display quality by suppressing the generation of stains and display unevenness in high temperature and high humidity environments, ensuring a high voltage holding ratio and minimizing remaining DC voltage.
Implementation Method 1
polymerizing the photo-polymerizable compound by light irradiation
Implementation Method 2
binding water and impurities through strong dipole-dipole interactions and hydrogen bonding
Data Source
AI summary
An aspect of the present invention provides a monomer from which a polymer layer capable of keeping high display quality even in high temperature and high humidity environments can be formed. The monomer in an aspect of the present invention is a compound represented by P-Sp1-Z2-A1-(Z1-A2)n1-Z3-Sp2-P: in the formula, P denotes the same or different radical polymerizable group; and at least one of Z1, Z2, and Z3 denotes —NRCO— or —CONR— group.