End-sealant Composition for LCD Panels
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Solution Overview
Problem
Conventional end-sealant compositions for liquid crystal display panels often cause image defects due to elution and diffusion into the liquid crystals, especially with high dielectric constant liquids, leading to stains and incidental images.
Innovation Solution
An end-sealant composition comprising an acrylic polymer resin, a polymeric photoinitiator polymerized into an acrylic chain, and an acryl-philic coupling agent, such as bisphenol-based acrylic resin, benzophenone-based photoinitiator, and silane-based coupling agents, which reduces diffusion into the liquid crystals before curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional end-sealant composition is used to seal the fill port, then the fill port is sealed, but the liquid crystals are polluted by elution of the uncured end-sealant composition causing image defects
Solution Approach 1:
The patent modifies the chemical composition parameters of the end-sealant by incorporating specific coupling agents (silane-based or acrylic-based) that react with the liquid crystal molecules. This chemical parameter change creates a crosslinked structure that prevents elution while maintaining sealing effectiveness, directly resolving the contradiction between sealing and pollution.
Solution Approach 2:
The patent uses composite end-sealant materials combining acrylic polymer resin with specific coupling agents (silane-based or acrylic-based). This composite formulation creates a chemically reactive sealant that forms crosslinked structures with liquid crystals, preventing elution while maintaining effective sealing, thus resolving the technical contradiction.
2Object-generated harmful factors
If the end-sealant composition is formulated to reduce elution, then image quality is improved, but the composition complexity increases
Solution Approach 1:
The patent adjusts the chemical parameters of the end-sealant composition by incorporating specific coupling agents (silane-based or acrylic-based) in controlled amounts. This parameter modification simplifies the composition formulation while effectively preventing elution, resolving the contradiction between reducing harmful factors and maintaining composition simplicity.
Solution Approach 2:
The patent introduces coupling agents as intermediary substances that mediate between the end-sealant composition and liquid crystals. These coupling agents form crosslinked structures that prevent elution without requiring complex composition formulations, thus resolving the contradiction between preventing elution and maintaining composition simplicity.
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 significantly reduces image defects by minimizing the diffusion of the end-sealant into the liquid crystals, maintaining image quality, especially with high dielectric constant liquids, and effectively seals the fill port without causing stains or incidental images.
Implementation Method 1
a polymeric photoinitiator polymerized into an acrylic chain
Implementation Method 2
an acryl-philic coupling agent (i.e., a coupling agent having an affinity for acrylic polymers)
Data Source
AI summary
An end-sealant composition for a liquid crystal display (LCD) panel includes an acrylic polymer resin, a polymeric photoinitiator polymerized into an acrylic chain, and an acryl-philic coupling agent. The end-sealant composition exhibits reduced diffusion into the liquid crystals during an end-sealant forming process. Image defects such as stains around fill ports and incidental images are thereby prevented, so that high quality displays can be prepared. Use of the end-sealant composition can provide high performance for high dielectric constant liquid crystals that are widely used in the fabrication of liquid crystal display panels.