Rotated Ink Coating for Uniform OLED Display Edge Profiles
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Solution Overview
Problem
Inkjet processes for manufacturing display devices, such as OLED displays, often result in non-uniform edge profiles and degraded print quality due to varying ink application directions, leading to inconsistent ink linearity and profile.
Innovation Solution
A coating method involving the application of a first ink followed by rotating the print object and applying a second ink, particularly at the edge, with both inks being optically clear resin, and subsequent curing, to ensure uniform ink application in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink is applied in a single direction using conventional inkjet process, then the manufacturing process is simple, but the edge profile is non-uniform and print quality is degraded
Solution Approach 1:
The coating process is segmented into multiple coating directions. The inkjet head applies ink in a first direction, then the substrate is rotated and ink is applied in a second direction perpendicular to the first. This segmentation of coating directions ensures uniform edge profiles by addressing different regions of the substrate with ink applied from different orientations, resolving the non-uniformity issue while maintaining process simplicity.
Solution Approach 2:
The substrate is dynamically rotated between coating steps. After the first coating pass, the substrate is rotated to change its orientation, enabling the second coating pass to apply ink in a perpendicular direction. This dynamic repositioning allows the system to achieve uniform edge profiles without requiring complex multi-directional inkjet heads, thus improving manufacturing precision without significantly increasing device complexity.
2Manufacturing precision
If multiple inkjet heads are added to apply ink in multiple directions, then print quality improves, but device complexity and cost increase
Solution Approach 1:
Instead of keeping the inkjet head stationary and adding multiple heads for different directions, the invention inverts the approach by keeping a single inkjet head fixed and rotating the substrate between coating passes. This inversion allows one head to achieve multi-directional coating效果, improving ink distribution uniformity while avoiding the complexity and cost of multiple inkjet heads.
Solution Approach 2:
A single inkjet head is made multi-functional through the substrate rotation mechanism. The same inkjet head performs coating in the first direction, then after substrate rotation, it performs coating in the second perpendicular direction. This multi-functionality allows one head to replace what would traditionally require multiple heads, reducing device complexity while maintaining improved ink distribution uniformity.
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 method improves ink linearity and profile consistency across different directions without increasing the number of inkjet heads, reducing costs and enhancing process efficiency.
Implementation Method 1
applying a first ink on a print object... applying a second ink on the first ink on the print object
Implementation Method 2
after applying the first ink on the print object, the coating method may further include curing the first ink applied on the print object
Data Source
AI summary
A coating method includes applying a first ink on a print object, rotating the print object to a substantially perpendicular position, and applying a second ink on the first ink on the print object.