Laser Induced Thermal Imaging Apparatus for OLED Lamination
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Solution Overview
Problem
Existing laser induced thermal imaging (LITI) methods face challenges in ensuring strong adhesion between a substrate and a donor film during lamination and preventing the organic layer from being lifted off during delamination in organic light emitting display device manufacturing.
Innovation Solution
A LITI apparatus with a stage and supporting portions that adjust the distance between the substrate and donor film, a pressurizing member for increased adhesion, and a gas discharge system to maintain a vacuum, allowing for precise control during lamination and delamination processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the donor film is laminated onto the acceptor substrate using conventional LITI method, then the organic layer can be transferred to the substrate, but the adhesion between the substrate and donor film is insufficient causing the organic layer to lift off during delamination
Solution Approach 1:
The patent applies vacuum pressure through a vacuum pressing member to press the donor film against the acceptor substrate during lamination. This pneumatic approach creates sufficient adhesion between the layers to prevent organic layer lift-off during subsequent delamination, directly resolving the adhesion insufficiency problem in conventional LITI methods
Solution Approach 2:
The patent performs lamination under vacuum pressure before the delamination step. By establishing strong adhesion between the donor film and acceptor substrate in advance through vacuum pressing, the organic layer remains securely attached during the subsequent removal of the donor film, preventing lift-off issues
2Reliability
If gas is not discharged between the substrate and donor film during lamination, then the lamination process is simpler, but air bubbles remain causing poor adhesion and transfer defects
Solution Approach 1:
The patent introduces a vacuum pressing member that creates negative pressure between the donor film and acceptor substrate during lamination. This vacuum environment actively removes gas bubbles from the interface, ensuring complete contact and high adhesion quality between layers, while the systematic approach integrates this function into the existing pressing mechanism
Solution Approach 2:
The vacuum pressing member serves multiple functions: it applies pressure to ensure intimate contact between layers, simultaneously evacuates gas bubbles from the interface, and maintains this vacuum environment throughout the lamination process. This multi-functionality achieves high adhesion quality without requiring separate gas discharge equipment
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
Enhances adhesion characteristics between the substrate and donor film, minimizing the likelihood of the organic layer being lifted off during delamination, thereby improving the manufacturing process for organic light emitting display devices.
Implementation Method 1
a photothermal conversion layer and a transfer layer which are sequentially stacked on a surface of the base film
Implementation Method 2
Laser induced thermal imaging (LITI) method
Data Source
AI summary
A laser induced thermal imaging (LITI) apparatus includes a stage configured to support an acceptor substrate and a supporting portion configured to support a donor film and to move the donor film up and down relative to the stage so as to adjust a distance between the acceptor substrate and the donor film. The donor film includes a thin film to be disposed on the acceptor substrate. The stage includes a discharging outlet through which gas between the acceptor substrate and the donor film is discharged to the outside. The LITI apparatus may be used to laminate a film on an acceptor substrate including an organic light emitting display device.