Photoresist Composition Gradient Distribution for OLED Inkjet Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photoresist compositions for OLED display panels struggle to achieve distinct lyophobic and lyophilic properties on the top and bottom of the pixel definition structure, leading to inkjet solution contamination and uneven ink distribution, which complicates the manufacturing process and affects display quality.
Innovation Solution
A photoresist composition comprising an organic film-forming resin, a superhydrophobic polymerizable monomer, a polyfunctional crosslinkable polymerizable monomer, a photoinitiator, an additive, and a solvent, where the boiling points of components are carefully selected to enable gradient distribution and polymerization, resulting in a pixel definition structure with distinct hydrophilic and hydrophobic properties on the top and bottom, allowing for a simplified one-time patterning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoresist composition uses multiple layers of lyophilic and lyophobic materials to achieve distinct hydrophilic and hydrophobic properties on the top and bottom of the pixel definition structure, then the inkjet solution can be prevented from spreading and contaminating adjacent pixels, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent applies local quality by incorporating a gradient distribution of hydrophobic polymerizable monomers within the photoresist composition. The monomers naturally migrate to form higher concentration at the top surface during drying, creating local hydrophobic properties at the top and hydrophilic properties at the bottom without requiring separate material layers. This resolves the contradiction by achieving differentiated surface properties through compositional gradient rather than structural layering.
Solution Approach 2:
The patent utilizes parameter changes by controlling the boiling point relationships between solvent and polymerizable monomers. The solvent has a lower boiling point than the monomers, allowing selective evaporation and natural gradient formation. By adjusting these boiling point parameters, the patent achieves automatic differentiation of hydrophilic/hydrophobic properties during the drying process, simplifying manufacturing while maintaining reliability.
2Manufacturing precision
If a photoresist composition uses multiple layers of lyophilic and lyophobic materials to achieve distinct hydrophilic and hydrophobic properties, then the inkjet solution can be uniformly spread inside the aperture area, but the manufacturing time and process steps increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the photoresist composition with a specific gradient distribution of hydrophobic monomers before the inkjet printing process. This preliminary gradient structure is formed during photoresist coating and drying, automatically creating the optimal surface for subsequent inkjet solution uniformity without requiring additional process steps. The gradient distribution is established in advance to ensure precise ink spreading.
Solution Approach 2:
The patent uses composite materials by formulating a photoresist composition that integrates organic film-forming resin, hydrophobic polymerizable monomers, crosslinkable monomers, and solvent in specific ratios. This composite formulation creates a material with built-in gradient capabilities that simultaneously provides both hydrophobic and hydrophilic characteristics, eliminating the need for multiple separate material layers and reducing process time.
3Reliability
If the photoresist composition uses components with carefully selected boiling points to enable gradient distribution, then the pixel definition structure achieves distinct hydrophilic and hydrophobic properties, but the composition formulation becomes more complex
Solution Approach 1:
The patent systematically controls the boiling point parameter of each component to achieve desired gradient distribution. The solvent has a lower boiling point than the polymerizable monomers, enabling selective evaporation and natural gradient formation. This parameter-based approach provides a clear formulation guideline that simplifies the complexity by establishing predictable relationships between component properties and final surface characteristics.
Solution Approach 2:
The patent creates a composite photoresist composition with specifically formulated ratios of organic film-forming resin (5-25%), hydrophobic polymerizable monomers (0.5-5%), crosslinkable monomers (0.1-5%), photoinitiator (0.5-5%), and solvent (69-93.8%). This standardized composite formulation balances the complexity of multiple components with the benefit of achieving reliable gradient distribution and distinct surface properties through proven compositional relationships.
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 solution enables the formation of a pixel definition structure with significantly different hydrophilic and hydrophobic properties on the top and bottom, preventing ink contamination and ensuring uniform ink distribution, thereby simplifying the manufacturing process and improving display panel quality and uniformity.
Implementation Method 1
performing a pre-baking process on the matrix such that a superhydrophobic polymerizable monomer is gradiently distributed in the matrix
Implementation Method 2
performing an exposure process on the matrix containing the gradiently-distributed superhydrophobic polymerizable monomer such that the superhydrophobic polymerizable monomer in the matrix is combined with crosslinking bridged bonds provided by the polyfunctional crosslinkable polymerizable monomer and a free radical provided by the photoinitiator to cause polymerization
Implementation Method 3
a free radical provided by the photoinitiator to cause polymerization
Implementation Method 4
vacuuming to remove the solvent to form a matrix of the pixel definition structure
Data Source
AI summary
Disclosed are a photoresist composition, a pixel definition structure and a manufacturing method thereof, and a display panel. The photoresist composition includes an organic film-forming resin, a superhydrophobic polymerizable monomer, a polyfunctional crosslinkable polymerizable monomer, a photoinitiator, an additive and a solvent.