Multimodal 3D Printing for OLED Display Fabrication
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Solution Overview
Problem
Current methodologies for fabricating OLED displays face challenges in scaling up to large panels and reducing material wastage, as they require conventional microfabrication facilities and struggle with achieving uniform active layers and high electrical conductivity in electrodes, while also needing plasma-enhanced deposition for encapsulating layers to improve device lifetime.
Innovation Solution
A multimodal 3D printing technique combining extrusion and spray printing to fabricate OLED displays, where extrusion is used for electrodes, interconnects, and encapsulation, and spray printing for active layers, allowing for uniform layer thickness and mechanical reconfiguration of droplets to increase contact area, enabling flexible and complex geometries without the need for conventional microfabrication facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microfabrication facilities are used for OLED fabrication, then high electrical conductivity and uniform layers can be achieved, but scaling up to large panels becomes difficult and material wastage increases
Solution Approach 1:
The patent replaces conventional microfabrication facilities with a 3D printing system that uses digital modeling and additive manufacturing to fabricate OLED components. This substitution enables large-scale production while maintaining precision through computer-controlled material deposition, resolving the contradiction between scaling capability and layer uniformity.
Solution Approach 2:
The invention changes the manufacturing parameters from conventional sputtering and evaporation to 3D printing parameters including extrusion rate, layer thickness control, and temperature management. These parameter changes allow for precise control of active layer uniformity while enabling fabrication on large substrates, thus improving both productivity and manufacturing precision.
2Manufacturing precision
If conventional evaporation methods are used for active layers, then uniform layers can be achieved, but material wastage increases and scaling becomes difficult
Solution Approach 1:
The 3D printing system deposits active layer material locally only where needed in the pixel matrix, rather than covering entire substrates as in conventional evaporation methods. This localized deposition reduces material wastage significantly while maintaining uniform layer quality through precise control of extrusion parameters and print head positioning.
Solution Approach 2:
The patent substitutes thermal evaporation with extrusion-based 3D printing for active layer fabrication. This mechanical substitution allows for on-demand material deposition with minimal waste, while digital control ensures uniform layer formation, simultaneously addressing both material efficiency and layer quality.
3Loss of substance
If spray printing is used for active layers, then material usage is optimized, but achieving uniform thickness becomes challenging
Solution Approach 1:
The patent merges the advantages of both extrusion and spray printing methods into a hybrid 3D printing system. The system uses extrusion for precise material delivery and spray printing for uniform distribution, combining both techniques to achieve material efficiency and thickness uniformity simultaneously in active layer fabrication.
4Ease of manufacture
If droplet geometry is maintained in second conductive layer, then printing process is simple, but contact area is insufficient for good electrical connection
Solution Approach 1:
The patent introduces a dynamic post-processing step where the deposited droplet geometry is mechanically reconfigured after printing. This dynamic transformation from simple droplet shape to expanded contact geometry maintains printing simplicity while significantly improving electrical conductivity through increased contact area with underlying layers.
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
This approach enables the production of flexible OLED displays with improved uniformity and performance, allowing for increased luminescence, reduced material waste, and the ability to fabricate on non-planar surfaces, while maintaining device lifetime and electrical conductivity.
Implementation Method 1
extrusion printing a first conductive layer utilizing a first extrusion printing nozzle set
Implementation Method 2
spray printing an active layer onto the first conductive layer utilizing a spray printing nozzle
Implementation Method 3
mechanically reconfigured from a droplet geometry to a second configuration that increases a bottom contact area of the droplet
Data Source
AI summary
A multimodal method of three-dimensionally (3D) printing a light-emitting diode (LED) display includes extrusion printing a first conductive layer utilizing a first extrusion printing nozzle set, spray printing an active layer onto the first conductive layer utilizing a spray printing nozzle, and extrusion printing a second conductive layer utilizing a second extrusion printing nozzle set.