Multilayer Pixel Define Structure for Uniform OLED Inkjet Printing
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Solution Overview
Problem
The existing OLED display panels face non-uniform light emission due to uneven thickness of the luminescent material, caused by the inkjet printing process where the lyophobicity of the pixel define layer's surface is strong but weak on its sides, leading to ink climbing and non-uniform material deposition.
Innovation Solution
A pixel define structure with a stacked multilayer comprising layers with increasing mass percentages of lyophobic materials from the substrate to the surface, preventing ink from climbing and ensuring uniform luminescent material thickness, achieved through an inkjet printing process with specific solutions containing varying concentrations of lyophobic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-layer pixel define layer is used with strong lyophobic material, then the surface lyophobicity is strong, but the side surface lyophobicity is weak causing ink climbing
Solution Approach 1:
The pixel define layer is divided into multiple stacked layers (first layer, second layer, and optionally third layer) with different lyophobic material compositions. Each layer has specific lyophobic properties tailored to its position, preventing ink climbing while maintaining uniform luminescent material deposition.
Solution Approach 2:
Different layers of the pixel define layer have different lyophobic material mass percentages tailored to their specific positions. The first layer (closer to substrate) has lower lyophobic content, the second layer (upper layer) has higher lyophobic content, creating locally optimized properties that prevent ink climbing on side surfaces while ensuring uniform top surface.
2Loss of substance
If inkjet printing is used to form luminescent material, then material utilization rate is high, but non-uniform deposition occurs due to ink climbing
Solution Approach 1:
The pixel define layer is pre-structured with multiple layers having different lyophobic properties before inkjet printing. This preliminary structure creates repulsive forces that prevent ink from climbing on side surfaces during the printing process, ensuring uniform material deposition while maintaining high material utilization rate.
3Stability of the object's composition
If lyophobic material concentration is increased in the pixel define layer, then surface lyophobicity improves, but side surface ink adhesion worsens causing climbing
Solution Approach 1:
The solution transitions from a single-layer to a multi-layer vertical structure, adding the dimension of layer stacking. This allows different lyophobic material concentrations to be distributed vertically, with lower concentration near the substrate and higher concentration at the top, preventing ink climbing while maintaining surface stability.
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 ensures uniform thickness of the luminescent material, enhancing the display effect by preventing ink climbing and maintaining consistent light emission across the OLED panel.
Implementation Method 1
a mass percent of the lyophobic material in the second layer is greater than a mass percent of the lyophobic material in the first layer
Data Source
AI summary
The present disclosure provides a pixel define structure, a display panel and a method for manufacturing the same, and a display device, relating to the technical field of display. The pixel define structure includes a pixel define layer including a lyophobic material on a substrate, wherein the pixel define layer includes a stacked multilayer including at least a first layer and a second layer, the first layer being located between the substrate and the second layer, wherein a mass percent of the lyophobic material in the second layer is greater than a mass percent of the lyophobic material in the first layer.