Black Photosensitive Resin Composition for Micro OLED Light Leakage
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Solution Overview
Problem
Current black photosensitive resin compositions for micro OLED displays face challenges in achieving high optical density and preventing light leakage, especially in next-generation displays like VR, AR, and MR devices, where high-resolution patterns and low-temperature curing are required.
Innovation Solution
A black photosensitive resin composition is developed, comprising a binder resin, lactam black as the black colorant, a photopolymerizable monomer, a photopolymerization initiator, and a solvent, with an optical density of at least 1.5 per 1 μm, allowing for low-temperature curing and high-resolution pattern formation, and including additives like malonic acid and a silane coupling agent for improved adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional black photosensitive resin compositions are used, then the manufacturing process is simple, but the optical density is insufficient and light leakage occurs
Solution Approach 1:
The patent changes the chemical composition parameters by introducing lactam black as the black colorant and optimizing the binder resin composition with specific acrylic components. This parameter change enables the resin composition to achieve optical density of 1.5 or higher while preventing light leakage, directly resolving the contradiction between simple manufacturing and high optical performance.
Solution Approach 2:
The patent creates a composite material system combining lactam black with a specific formulation of binder resin (acrylic components), photopolymerizable monomers, and initiators. This composite approach achieves both high optical density and effective light blocking, eliminating light leakage while maintaining manufacturability through a unified material solution.
2Illumination intensity
If high optical density is achieved through conventional means, then light leakage is prevented, but the curing temperature becomes too high for next-generation displays
Solution Approach 1:
The patent modifies the chemical parameters by selecting specific photopolymerization initiators and optimizing the acrylic binder resin composition. These parameter changes enable the resin to achieve high optical density while remaining curable at low temperatures (≤100°C), which is critical for next-generation display manufacturing processes.
Solution Approach 2:
The patent applies local quality by using a specialized low-temperature curable binder resin system that maintains high optical density properties while enabling temperature-controlled curing. This localized optimization of the curing process allows high optical performance without requiring high-temperature processing that would damage sensitive display components.
3Manufacturing precision
If conventional resin compositions are used, then the manufacturing process is straightforward, but ultra-high resolution patterns of 2 μm or less cannot be formed
Solution Approach 1:
The patent optimizes the resin composition parameters including the molecular weight and composition of the binder resin, the type and concentration of photopolymerizable monomers, and the photopolymerization initiator. These parameter changes enable the formation of ultra-high resolution patterns of 2 μm or less while maintaining a relatively simple manufacturing process through controlled photopolymerization.
Solution Approach 2:
The patent replaces complex mechanical processing with a chemical solution approach by using photopolymerization to achieve high-resolution patterns. The photopolymerizable monomers and initiators enable precise pattern formation through light-induced polymerization, substituting complex mechanical alignment and processing steps with a more straightforward chemical curing process that achieves the same or better resolution.
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 blocks light leakage, enables ultra-high resolution patterns of 2 μm or less, and is suitable for micro OLED displays, ensuring high reliability and patternability with low-temperature curing, enhancing the performance of next-generation display devices.
Implementation Method 1
a photopolymerizable monomer; a photopolymerization initiator
Implementation Method 2
a black colorant including lactam black... the black photosensitive resin composition has an optical density (OD) per 1 μm of greater than or equal to about 1.5
Data Source
AI summary
A black photosensitive resin composition, a black partition wall manufactured using the same, a display device including the black partition wall, and a method of manufacturing the black partition wall, the black photosensitive resin composition includes a binder resin; a black colorant including lactam black; a photopolymerizable monomer, a photopolymerization initiator; and a solvent, wherein the black photosensitive resin composition has an optical density (OD) per 1 μm of greater than or equal to about 1.5.