Inkjet Printing Micro-Features Smoothness via Substrate Temperature Control
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Solution Overview
Problem
Ink-jet printing faces challenges in producing smooth micro-scale features due to edge scalloping, which affects the electrical performance and consistency of printed circuits, particularly in organic electronics, where droplet solidification and spreading dynamics lead to irregularities in feature formation.
Innovation Solution
A method involving determining the optimum decimation pitch and analyzing printed test patterns to minimize droplet spreading and edge roughness, using a printing system with controlled substrate temperature and electric field to enhance droplet coalescence and solidification, ensuring smooth micro-scale feature formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ink-jet printing is used to deposit print solution droplets onto substrate, then production costs are reduced and printing speed is improved, but edge scalloping occurs and manufacturing precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-heating the substrate to a specific temperature range (20-40°C) before droplet deposition. This preliminary thermal preparation prevents premature solidification of droplets and ensures uniform spreading, thereby eliminating edge scalloping while maintaining high printing speeds. The substrate temperature is controlled in advance to optimize droplet behavior during the printing process.
Solution Approach 2:
The patent changes the substrate temperature parameter to resolve the contradiction. By controlling the substrate temperature within 20-40°C, the patent optimizes droplet spreading and solidification dynamics. This parameter change allows fast printing speeds while achieving smooth edges, as the thermal condition prevents scalloping without requiring slow printing rates.
2Productivity
If droplets are deposited at high speed, then productivity is improved, but droplet solidification and spreading dynamics cause irregularities in feature formation
Solution Approach 1:
The patent changes the substrate temperature parameter to resolve the contradiction between high deposition rate and feature formation consistency. By maintaining substrate temperature at 20-40°C, the patent controls droplet spreading and solidification dynamics, ensuring consistent feature formation even at high printing speeds. This thermal parameter optimization allows rapid deposition without sacrificing feature uniformity.
Solution Approach 2:
The patent applies preliminary action by pre-conditioning the substrate temperature before droplet deposition. This preliminary thermal preparation ensures that when droplets are deposited at high speed, they spread and solidify uniformly, preventing irregularities in feature formation. The advance temperature control prepares the substrate to receive droplets consistently, maintaining feature quality at high productivity rates.
3Ease of manufacture
If conventional printing parameters are used, then ease of manufacture is maintained, but electrical continuity and reliability are compromised due to edge scalloping
Solution Approach 1:
The patent changes the substrate temperature parameter to resolve the contradiction between ease of manufacture and electrical continuity. By controlling temperature at 20-40°C, the patent ensures smooth droplet spreading and uniform feature formation, which directly improves electrical continuity. This simple thermal control parameter enhances reliability without complicating the manufacturing process.
Solution Approach 2:
The patent utilizes phase transitions of the print solution material to resolve the contradiction. By controlling substrate temperature at 20-40°C, the patent optimizes the solidification phase transition of deposited droplets. This thermal control ensures complete and uniform solidification, eliminating edge scalloping and ensuring electrical continuity while maintaining simple manufacturing processes.
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 smooth, consistent micro-scale features by optimizing spot placement and droplet behavior, improving the electrical continuity and reducing defects in printed circuits.
Implementation Method 1
Once dispensed from the ejector(s) of the print head, print solution droplets attach themselves to the substrate through a wetting action and proceed to solidify in place, forming printed features
Implementation Method 2
The thermal conditions and material properties of the print solution and substrate, along with the ambient atmospheric conditions, determine the specific rate at which the deposited print solution transforms from a liquid to a solid
Data Source
AI summary
A method of jet-printing smooth micro-scale features is presented. The desired feature prior to being printed is masked by various decimation filters and the decimation is performed at various pitches. The subsequently printed image is then scanned and analyzed to determine the roughness of the lines. The optimum decimation pitch is determined by the feature that exhibits the least amount of droplet spreading and has the lowest edge roughness. The optimum decimation pitch may also be calculated from the material properties and the dynamics of fluids.