Positive Photosensitive Resin Composition for OLED Pattern Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photosensitive resin films used in organic light emitting diode (OLED) manufacturing suffer from pattern collapse during thermal curing, generate excessive outgases, and lack heat and chemical resistance, leading to reliability issues and short device lifespan.
Innovation Solution
A positive photosensitive resin composition comprising an alkali soluble resin, photosensitive diazoquinone compound, cross-linking agent, thermal acid generator, phenol compound, and organic solvent, with specific weight ratios and additives, which allows for low-temperature curing, maintains pattern shape, minimizes outgases, and enhances heat and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensitive resin films are used for thermal curing, then curing is achieved, but pattern collapse occurs and heat resistance is insufficient
Solution Approach 1:
The patent uses a composite resin system combining polyimide and polybenzoxazole precursors with specific cross-linking agents (melamine and methylol-based) to achieve both high heat resistance and pattern stability during curing, resolving the contradiction between thermal performance and manufacturing precision
Solution Approach 2:
The patent optimizes the weight ratio of cross-linking agent to thermal acid generator (1:50 to 50:1, preferably 5:20 to 20:5) and controls curing temperature at 250°C or lower to prevent pattern collapse while achieving sufficient heat resistance, demonstrating parameter optimization to resolve the contradiction
2Reliability
If high temperature curing is applied to improve heat resistance, then heat resistance increases, but outgas generation increases causing defects
Solution Approach 1:
The patent changes the curing parameter from high temperature to low temperature (250°C or lower), which simultaneously achieves heat resistance while minimizing outgas generation that causes dark spots and pixel shrinkage defects
Solution Approach 2:
The patent introduces phenol compounds as additives to specifically address outgas generation at the molecular level, providing localized chemical modification that reduces harmful outgassing while maintaining overall heat resistance of the resin film
3Manufacturing precision
If fine structures are formed to improve device performance, then device functionality improves, but pattern collapse during curing increases
Solution Approach 1:
The patent employs a composite system of cross-linking agents (melamine-based and methylol-based) that provides enhanced structural support during curing, enabling fine structures to maintain their shape without collapse while achieving the required pattern precision
Solution Approach 2:
The patent optimizes the cross-linking agent to thermal acid generator ratio (1:50 to 50:1, preferably 5:20 to 20:5) to control the curing reaction rate and cross-linking density, providing sufficient structural support for fine patterns during curing while avoiding excessive rigidity that would cause collapse
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 effectively prevents pattern collapse, reduces outgase generation, and improves heat and chemical resistance, ensuring reliable and long-lasting OLED performance by maintaining pattern integrity and reducing defects like dark spots and pixel shrinkage.
Implementation Method 1
a thermal acid generator... which decomposes at a low temperature to generate acid
Implementation Method 2
a photosensitive diazoquinone compound
Data Source
AI summary
Disclosed is a positive photosensitive resin composition including (A) an alkali soluble resin; (B) a photosensitive diazoquinone compound; (C) a cross-linking agent; (D) a thermal acid generator; (E) a phenol compound; and (F) an organic solvent, wherein the cross-linking agent and thermal acid generator are included in a weight ratio of about 1:50 to about 50:1.