OLED Mask Overhang for Single-Step Deposition
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Solution Overview
Problem
The existing methods for manufacturing organic light-emitting devices (OLEDs) require multiple masks and complex processes, leading to increased manufacturing costs, interrupted flow, and potential particle generation, which hinder the adoption of OLEDs for large-area lighting applications.
Innovation Solution
A removable mask with overhang features allows for the simultaneous deposition of organic layers and conducting materials on partially overlapping regions of a substrate using a single shadow mask, simplifying the manufacturing process and reducing costs by utilizing vacuum thermal evaporation for both layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple masks are used for depositing organic layers and cathode, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple mask functions into a single integrated mask structure. The mask includes both organic layer deposition regions and cathode contact region definition regions, eliminating the need for separate masks for each layer. This merging reduces mask system complexity while maintaining alignment precision through a unified reference frame.
Solution Approach 2:
The single mask performs multiple functions simultaneously: it defines patterns for organic layers, defines cathode contact regions, and provides alignment references for subsequent deposition steps. This multi-functionality eliminates the need for multiple specialized masks, reducing overall device complexity.
2Manufacturing precision
If multiple masks are used for depositing organic layers and cathode, then manufacturing precision is improved, but productivity decreases due to interrupted flow
Solution Approach 1:
The single integrated mask enables continuous deposition operations without requiring mask changes or substrate transfers between different mask frames. The organic layers and cathode can be deposited in sequence using the same mask, maintaining uninterrupted manufacturing flow and improving productivity.
3Manufacturing precision
If multiple masks are used for depositing organic layers and cathode, then manufacturing precision is improved, but loss of time increases due to mask transfer and realignment
Solution Approach 1:
All alignment references and pattern definitions are prepared in advance within the single integrated mask structure. The mask is designed with built-in alignment features that eliminate the need for time-consuming realignment operations between multiple masks, reducing time loss while maintaining precision.
4Manufacturing precision
If multiple masks are used for depositing organic layers and cathode, then manufacturing precision is improved, but object-generated harmful factors increase due to particle generation
Solution Approach 1:
By merging multiple mask operations into a single mask system, the patent reduces the number of mask transfer operations and substrate handling steps. This minimizes the opportunities for particle generation during mask changes and realignment, reducing harmful contaminants while maintaining manufacturing precision.
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 simplifies the manufacturing of OLED lighting devices by enabling the deposition of organic and conducting materials in a single step with a single mask, reducing manufacturing complexity and costs while maintaining the quality of the OLED layers.
Implementation Method 1
utilizing a single shadow mask placed against a substrate to deposit organic layers on a first region of the substrate, and without moving the mask, deposit a conducting layer
Data Source
Figure 1a~1b
Figure 1c~2a
Figure 2b~2c
AI summary
An apparatus for depositing one or more organic material layers of an OLED lighting device upon a first region of a substrate and one or more conducting layers upon a second region, wherein the conducting layers partially or completely cover and extend beyond one side of the organic layers, comprising: a reusable mask in contact with the substrate, at least one mask open area having an overhang feature.