Novel Photoactive Compound for LCD Resins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photoactive compounds used in photosensitive resin compositions lack efficient UV light absorption, sensitivity, and high temperature process properties, which are crucial for advanced applications such as liquid crystal display devices.
Innovation Solution
A novel photoactive compound with a structure incorporating a nitro group and a phosphonate group, represented by Formula 1, is developed, enhancing UV light absorption and compatibility with alkali-soluble binder resins to improve sensitivity and high temperature process properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional photoactive compounds are used, then the photosensitive resin composition can be manufactured, but the UV light absorption efficiency is insufficient and sensitivity is poor
Solution Approach 1:
The patent modifies the molecular structure of photoactive compounds by introducing specific functional groups (nitro group at position 7 and carboxymethyl group at position 4 of the coumarin ring) to change the absorption characteristics and sensitivity parameters, achieving both high UV absorption efficiency and excellent photosensitivity
Solution Approach 2:
The patent creates composite photoactive compounds combining coumarin core structure with nitro and carboxymethyl functional groups, achieving synergistic effects that simultaneously improve UV absorption efficiency and photosensitivity beyond what single functional groups can provide
2Reliability
If the photoactive compound concentration is increased to improve sensitivity, then sensitivity improves, but the compatibility with alkali-soluble binder resin decreases
Solution Approach 1:
The patent introduces a carboxymethyl functional group at position 4 of the coumarin ring, which provides both enhanced photosensitivity and improved compatibility with alkali-soluble binder resins through hydrogen bonding and polar interactions, allowing high concentration use without compromising compatibility
Solution Approach 2:
The patent places different functional groups at specific positions on the coumarin ring: the nitro group at position 7 for UV absorption enhancement and the carboxymethyl group at position 4 for binder resin compatibility, allowing each part to perform its specific function optimally
3Reliability
If the photosensitive resin composition is optimized for sensitivity, then sensitivity improves, but high temperature process properties deteriorate
Solution Approach 1:
The patent designs composite photoactive compounds with coumarin core, nitro group, and carboxymethyl group that work synergistically to provide both high sensitivity and thermal stability, achieving a balance between photosensitivity and high temperature process properties
Solution Approach 2:
The patent optimizes the molecular weight and structural parameters of the photoactive compound to ensure sufficient sensitivity while maintaining appropriate thermal properties for high temperature processing, avoiding excessive sensitivity that would compromise thermal stability
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 novel photoactive compound significantly enhances the sensitivity and solubility of the photosensitive resin composition, leading to improved developing margins and mechanical properties, making it suitable for applications like column spacers and black matrix materials in liquid crystal display devices.
Implementation Method 1
a photoactive compound having high absorptivity to a UV light source
Implementation Method 2
A photoactive compound is a material that is decomposed by absorbing light to generate chemically active atoms or molecules
Implementation Method 3
the photoactive compound generating radicals may be used together with an acryl group causing a polymerization reaction along with radicals
Data Source
AI summary
The present invention relates to a photoactive compound having a novel structure and a photosensitive resin composition including the same, and the photoactive compound according to the present invention has excellent sensitivity due to efficient absorption to a UV light source by including a nitro group and a phosphonate structure, and has excellent retention rate, mechanical strength, heat resistance, chemical resistance and developing resistance by improving solubility of the photosensitive resin composition by excellent compatibility of the phosphonate structure and a binder resin. Therefore, the photosensitive resin composition according to the present invention is useful to cure a column spacer, an overcoat, a passivation material and the like of a liquid crystal display device, and is useful in view of a high temperature process property.