Donor Substrate With Patterned Thermal Barrier for OLED Deposition
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Solution Overview
Problem
Conventional OLED fabrication processes face complications due to the complexity of fabricating fine metal mask plates, alignment issues, and deformation during deposition, leading to reduced material utilization and inefficiencies.
Innovation Solution
A donor substrate with a patterned thermal barrier layer and openings is used to transfer deposition material onto an acceptor substrate, allowing for uniform heating and controlled evaporation, thereby overcoming alignment and deformation challenges and improving material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional evaporation crucible is used to deposit organic light emitting material onto a substrate, then the material can be evaporated and deposited, but the process suffers from alignment issues, deformation during deposition, and reduced material utilization
Solution Approach 1:
The patent introduces a donor substrate as an intermediary carrier that holds the organic light emitting material. Instead of direct evaporation from a crucible onto the final substrate, the material is first deposited on the donor substrate, then transferred through controlled evaporation. This intermediary step enables precise alignment and prevents deformation, while the patterned thermal barrier layer ensures material is deposited only where needed, improving utilization.
Solution Approach 2:
The patent segments the deposition process into distinct stages: material deposition on donor substrate, patterned thermal barrier formation, controlled evaporation, and transfer to acceptor substrate. The thermal barrier layer is patterned with openings that segment the evaporation zones, allowing precise control over where material is transferred, thereby improving both alignment precision and material utilization.
2Productivity
If the organic light emitting material is directly evaporated onto the substrate using a heating source, then the deposition can be completed, but substrate deformation occurs and material distribution uniformity is reduced
Solution Approach 1:
The donor substrate serves as a mediator that undergoes controlled evaporation while protecting the final acceptor substrate from direct thermal exposure. The patterned thermal barrier layer on the donor substrate controls the evaporation process, allowing material to be transferred without causing deformation to the acceptor substrate, thus maintaining substrate stability while preserving deposition efficiency.
Solution Approach 2:
The thermal barrier layer is patterned with specific openings that create local evaporation zones. This local quality approach ensures that heating and evaporation occur only in specific regions where material transfer is needed, preventing uniform heating that would cause substrate deformation, while maintaining efficient material transfer in the targeted areas.
3Manufacturing precision
If a patterned thermal barrier layer with openings is used on the donor substrate, then material distribution uniformity and alignment precision are improved, but the device complexity increases
Solution Approach 1:
The patterned thermal barrier layer creates a porous or open-structured surface on the donor substrate. This porous structure allows controlled vapor transmission through the openings while the barrier portions prevent evaporation in non-target areas. The porous design achieves precise alignment and uniform material distribution without requiring complex multi-layer structures or additional alignment mechanisms.
4Productivity
If the donor substrate is uniformly heated to evaporate deposition material, then material transfer efficiency is improved, but uncontrolled evaporation from the entire surface occurs
Solution Approach 1:
The patterned thermal barrier layer creates regions of different thermal properties on the donor substrate. The barrier portions block heat transmission to deposited material in non-target areas, while the openings allow heat to reach and evaporate material in target areas. This local quality approach enables uniform heating of the entire donor substrate while controlling evaporation to occur only where needed, improving transfer efficiency and preventing material waste.
Solution Approach 2:
The thermal barrier layer changes the thermal conductivity parameter locally across the donor substrate surface. By patternning the barrier layer, the patent creates zones with different thermal parameters that control where evaporation occurs during uniform heating. This parameter change approach allows efficient material transfer from heated regions while preventing waste from uncontrolled evaporation in non-target zones.
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 enhances material utilization and uniformity of deposition, improving the efficiency and reliability of OLED fabrication by allowing for precise control over the deposition process and minimizing substrate deformation.
Implementation Method 1
a patterned thermal barrier layer on the base substrate... The patterned thermal barrier layer has a thermal conductivity at room temperature of less than 0.50 W·m−1·K−1
Implementation Method 2
heating the base substrate of the donor substrate to a first temperature at which a deposition material in the first deposition material layer is evaporated
Implementation Method 3
depositing the deposition material evaporated from the first deposition material layer into the plurality of target regions of the acceptor substrate
Data Source
AI summary
The present application discloses a donor substrate for depositing a deposition material on an acceptor substrate. The donor substrate includes a base substrate; a patterned thermal barrier layer on the base substrate; and a plurality of openings each of which extending through the patterned thermal barrier layer.