Pixel Define Layer Moisture Control via Photosensitive Resin
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in achieving a desired antireflection effect and lack suitable alternatives for polarizing films, especially for flexible devices. Additionally, colored light blocking layers used to prevent color interference and improve image quality often suffer from high moisture content, leading to issues like pixel shrinkage and reduced lifespan.
Innovation Solution
A photosensitive resin composition is developed to improve visibility by reducing reflectivity near 550 nm, ensuring vivid colors, and increasing display reliability and lifespan. This composition is used to prepare a pixel defining layer with a moisture content of 50 ppm or less, an optical density of 0.8 to 1.5/μm, and a reflectivity of 0.01% to 6.5%, thereby minimizing moisture absorption and generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colored light blocking layers are used to improve image quality and visibility, then optical density increases and color interference is prevented, but moisture content increases leading to pixel shrinkage and reduced lifespan
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive resin by incorporating specific crosslinking agents and controlling the ratio of monomers to oligomers. This enables sufficient crosslinking during post-heat treatment, reducing moisture content from typical high levels to 50 ppm or less, thereby preventing pixel shrinkage and electrode oxidation while maintaining high optical density for color interference prevention
Solution Approach 2:
The patent creates a composite photosensitive resin composition combining multiple components: monomers (containing polymerizable groups), oligomers (providing structural backbone), crosslinking agents (forming three-dimensional networks), and colorants. This composite structure achieves both high optical density for light blocking and low moisture content through effective crosslinking, resolving the contradiction between visibility improvement and display reliability
2Reliability
If sufficient crosslinking is achieved during post-heat treatment to reduce moisture, then moisture content decreases and lifespan increases, but external moisture absorption must be prevented simultaneously
Solution Approach 1:
The patent optimizes the crosslinking density by adjusting the concentration and type of crosslinking agents in the photosensitive resin composition. This creates a tightly crosslinked network structure that not only reduces internal moisture content to 50 ppm or less but also forms a barrier against external moisture absorption, simultaneously addressing both reliability improvement and harmful factor prevention
Solution Approach 2:
The crosslinked polymer network acts as an intermediary barrier between the internal resin matrix and external environment. The dense crosslinking structure created by the crosslinking agents serves as a moisture barrier, preventing external moisture from penetrating into the pixel defining layer while maintaining the low internal moisture content achieved during post-heat treatment
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 method effectively reduces reflectivity, maintains low moisture content, and enhances the lifespan and luminance of organic light emitting displays, while also allowing for flexible display options by reducing the thickness and weight of the display.
Implementation Method 1
since the colored patterns lack crosslinking during the development process
Implementation Method 2
the moisture is removed through the post-heat treatment process
Data Source
AI summary
Provided is a method for ensuring vivid colors and increasing display reliability and lifespan by implementing a colored pattern with high optical density on an electrode substrate, where the method uses a pigment dispersion in which a pigment having a size of 100 nm or less is used in order to increase the optical density and reduce roughness after completing the post-heat treatment process by including a colorant according to the present disclosure, and the method can minimize the reduction in the lifespan due to moisture in the panel state by minimizing the moisture content after completing the post-heat treatment process.