Photosensitive Composition for Organic EL Pixel Division Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing photosensitive compositions used for forming pixel division layers in organic electroluminescence (EL) display devices generate development residues and corrosion on silver alloy electrodes, leading to electrical short circuits and off-pixel issues, especially when stored at freezing temperatures, where the dispersion stabilizing function of dispersants is impaired.
Innovation Solution
A photosensitive composition comprising a pigment, a resin with two or more tertiary amino groups, and a photosensitive agent, where the resin has a specific structure represented by the general formula, is used to form a pixel division layer, suppressing development residue and electrode corrosion, and maintaining stability even under freezing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensitive compositions with standard dispersants are used to form pixel division layers, then the light-shielding property is achieved, but development residues and electrode corrosion occur leading to electrical short circuits
Solution Approach 1:
The patent changes the chemical parameters of the dispersant by introducing a specific molecular structure containing a polyether chain with tertiary amino groups. This structural modification alters the dispersant's interaction with the organic pigment and electrode surface, eliminating development residues and preventing electrode corrosion while maintaining the light-shielding function of the pixel division layer
Solution Approach 2:
The patent creates a composite dispersant system combining polyether chains with tertiary amino groups, which synergistically provides both pigment dispersion stability and electrode protection. This composite molecular structure simultaneously achieves multiple functions: preventing development residue, preventing electrode corrosion, and maintaining light-shielding properties
2Stability of the object's composition
If photosensitive compositions are stored at freezing temperatures for long periods to maintain stability, then component degradation is prevented, but dispersion stabilizing function is impaired
Solution Approach 1:
The patent modifies the dispersant's molecular parameters by incorporating flexible polyether chains with tertiary amino groups that remain active at freezing temperatures. This structural change allows the dispersant to maintain its stabilization function even when stored at low temperatures, preventing pigment aggregation while avoiding component degradation
3Manufacturing precision
If existing dispersants are used to ensure pigment dispersion, then the pixel division layer is formed, but convex portions are generated on the electrode surface
Solution Approach 1:
The patent changes the dispersant's molecular structure to include polyether chains with tertiary amino groups that provide controlled interaction with the electrode surface. This parameter modification ensures uniform pixel division layer formation while preventing convex portion generation, maintaining electrode surface flatness and preventing electrical short circuits
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 the generation of development residues and electrode corrosion, reducing the occurrence of off-pixels in organic EL display devices, ensuring stable performance and storage of the devices.
Implementation Method 1
a photosensitive agent (c)
Data Source
AI summary
The present invention provides a photosensitive composition which can suppress the generation of a development residue on the surface of an electrode and the corrosion of the electrode to form a black pixel division layer, and also can suppress the generation of off-pixel in an organic EL display device comprising the pixel division layer. Disclosed is a photosensitive composition comprising (a) a pigment, (b) a resin having two or more tertiary amino groups in the molecule, and (c) a photosensitive agent, wherein the component (b) contains a resin having a structure represented by the general formula (1).