Hydrogenated Bisphenol A Epoxy Anisotropic Conductive Film
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Solution Overview
Problem
Current anisotropic conductive films for chip-on-glass (COG) devices face challenges with high bonding temperatures, long bonding times, and vulnerability to heat and humidity, leading to reliability issues and potential defects.
Innovation Solution
An anisotropic conductive film composition comprising a hydrogenated bisphenol A epoxy monomer or oligomer, a sulfonium curing agent, a binder resin, and conductive particles, which provides rapid low-temperature curing and improved moisture and heat resistance, with a curing rate of 70% or more at 150-170°C for 5-10 seconds and a glass transition temperature of 120°C or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional anisotropic conductive films are used for bonding, then bonding can be achieved, but high bonding temperatures and long bonding times are required
Solution Approach 1:
The patent changes the chemical composition parameters of the epoxy resin system by incorporating hydrogenated bisphenol A epoxy monomer and oligomer with specific molecular weight ranges, which enables the curing reaction to proceed at lower temperatures and faster rates, directly reducing bonding time and temperature requirements
Solution Approach 2:
The patent creates a composite epoxy system combining monomer and oligomer components with a sulfonium curing agent, where the synergistic interaction between these materials enables rapid low-temperature curing, achieving both reduced bonding time and temperature while maintaining bond strength
2Ease of manufacture
If conventional anisotropic conductive films are used, then bonding can be achieved, but the bonded device is vulnerable to heat and humidity
Solution Approach 1:
The patent modifies the chemical structure parameters of the epoxy resin by using hydrogenated bisphenol A-based monomers and oligomers, which provide enhanced thermal stability and moisture resistance, improving the bonded device's reliability under heat and humidity conditions
Solution Approach 2:
The patent develops a composite material system combining specific epoxy resins with sulfonium curing agents that creates a crosslinked network structure with superior resistance to heat and humidity, enhancing the overall reliability of the bonded electronic device
3Reliability
If conventional epoxy resins are used, then bonding can be achieved, but rapid low-temperature curing with 70% or more curing rate at 150-170°C for 5-10 seconds is not obtained
Solution Approach 1:
The patent optimizes the molecular weight parameters of the epoxy oligomer (5,000-150,000 g/mol) and the stoichiometric ratio between epoxy groups and sulfonium curing agent, enabling the curing reaction to achieve 70% or higher curing rate at 150-170°C within 5-10 seconds while maintaining connection reliability
4Reliability
If conventional epoxy resins are used, then bonding can be achieved, but glass transition temperature of 120°C or more is not achieved
Solution Approach 1:
The patent changes the chemical composition parameters by selecting epoxy resins with specific structural characteristics (hydrogenated bisphenol A-based monomer and oligomer) that inherently provide higher glass transition temperatures, enabling the bonded device to maintain dimensional stability at temperatures of 120°C or above
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 ensures high connection reliability and resistance to deformation by temperature or humidity, preventing short circuits and maintaining initial physical properties after reliability testing, while reducing defects due to rapid curing and enhanced thermal and moisture resistance.
Implementation Method 1
a sulfonium curing agent
Data Source
AI summary
An anisotropic conductive film composition for bonding an electronic device may include a hydrogenated bisphenol A epoxy monomer represented by Formula 1 or a hydrogenated bisphenol A epoxy oligomer represented by Formula 2:where n may be an integer from 1 to about 50.