Layer Structure Fabrication Using Protective Ablation
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Solution Overview
Problem
The high cost and complexity of photolithography processes in patterning layer structures for OLEDs, particularly for small product series, lead to expensive components and potential quality issues due to debris from ablation processes.
Innovation Solution
A fabrication method and computer program that pattern layers without photolithography by using a protective material to shield the substrate during laser ablation, followed by removal of the protective material and etching to create patterned layers, reducing debris impact and improving layer quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used to pattern the first layer, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the expensive photolithography step from the fabrication process. Instead of using photolithography to pattern the first layer, the invention directly deposits patterned material to form the first layer, eliminating the need for photoresist coating, exposure, and development steps while maintaining pattern precision.
Solution Approach 2:
The patent replaces the expensive and complex photolithography process with a simpler, more cost-effective direct patterning approach. The direct deposition method uses disposable patterned masks or direct writing techniques that are cheaper than photolithography equipment and materials, while still achieving the required pattern precision.
2Productivity
If ablation is performed without protective material, then productivity is improved, but object-affected harmful factors increase due to debris
Solution Approach 1:
The patent applies protective material to the substrate before performing ablation or deposition processes. This preliminary protection step prevents debris from contaminating the substrate and sensitive layers during high-speed ablation, allowing productivity to be maintained without quality degradation.
Solution Approach 2:
The protective material acts as an intermediary layer between the ablation process and the substrate. It absorbs and contains debris generated during high-speed ablation, preventing direct contamination of the substrate while allowing the ablation process to proceed at high speed without interruption for cleaning.
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 reduces costs and enhances layer structure quality by eliminating the need for photolithography and minimizing debris-related issues, such as unwanted shortcuts, thereby improving the overall fabrication process efficiency.
Implementation Method 1
an ablation unit for ablating the unpatterned first layer through the protective material such that the patterned first layer is generated
Data Source
Figure 1
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Figure 6~9
AI summary
The invention relates to a fabrication apparatus for fabricating a layer structure comprising at least a patterned first layer on a substrate. A layer structure (6) with an unpatterned first layer is provided on the substrate. A protective material application unit (8) applies protective material at least on parts of the provided layer structure for protecting at least the parts of the provided layer structure (6), an ablation unit (12) ablates the unpatterned first layer through the protective material such that the patterned first layer is generated, and the protective material removing unit (15) removes the protective material (9). This allows fabricating a layer structure for, for example, an OLED without necessarily using a technically complex and costly photolithography process. Moreover, ablation debris can be removed with removing the protective material, thereby reducing the probability of unwanted effects like unwanted shortcuts in the OLED caused by unwanted debris.