Laser-Induced Thermal Imaging Transfer for OLED Patterning
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Solution Overview
Problem
The existing methods for manufacturing organic light-emitting display apparatuses face defects due to non-uniformity in the quality of donor films used for transferring emission layers, leading to complications in the lamination and transfer processes, resulting in a high defect occurrence ratio.
Innovation Solution
A method utilizing a laser-induced thermal imaging (LITI) technique for patterning and transferring a transfer layer on a donor film, which includes layers such as hole injection, hole transport, electroluminescent, and electron injection layers, onto an acceptor substrate, with precise alignment and removal of non-patterned portions using a UV laser, and subsequent lamination and transfer processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shadow mask method or inkjet printing method is used for patterning the emission layer, then the manufacturing process is simpler, but the resolution and patterning precision are insufficient
Solution Approach 1:
The emission layer is first formed on a separate donor film before transfer, allowing preliminary patterning and quality control. This preliminary action enables high-resolution patterning to be achieved on the donor film using LITI method, and then the pre-patterned emission layer is transferred to the final substrate, resolving the contradiction between precision and complexity
Solution Approach 2:
A donor film is introduced as an intermediary substrate to hold and pattern the emission layer before transfer. This intermediary allows the emission layer to be precisely patterned on the donor film using LITI method, then transferred to the final substrate, achieving high resolution without requiring complex direct patterning equipment on the final substrate
2Reliability
If the emission layer is directly formed on the final substrate, then the process steps are reduced, but the quality uniformity and transfer accuracy deteriorate
Solution Approach 1:
The manufacturing process is segmented into separate stages: forming the emission layer on a donor film, patterning it, then transferring to the final substrate. This segmentation allows each stage to be optimized independently - the donor film stage ensures quality uniformity through controlled formation and LITI patterning, while the transfer stage handles the final placement, resolving the contradiction between reliability and productivity
Solution Approach 2:
The emission layer is first created as a copy on the donor film with precise patterning, then this copied and pre-patterned layer is transferred to the final substrate. This copying approach on the donor film enables high-quality uniform patterning to be replicated onto the final substrate, maintaining reliability while improving overall manufacturing efficiency
3Manufacturing precision
If laser-induced thermal imaging (LITI) method is used for patterning, then the resolution and patterning precision improve, but the process complexity and equipment requirements increase
Solution Approach 1:
The LITI patterning process is applied to the emission layer on the donor film rather than directly on the final substrate. The donor film acts as an intermediary that receives the high-resolution LITI pattern, then transfers it to the final substrate. This approach achieves high patterning resolution through LITI while simplifying the overall equipment requirements by performing the complex patterning operation on the more manageable donor film
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 the defect occurrence ratio by ensuring precise patterning and transfer, independent of donor film quality uniformity, simplifying the lamination and transfer conditions, and reducing manufacturing costs.
Implementation Method 1
The patterning may include removing a non-pattern portion of the transfer layer using a laser.
Implementation Method 2
A method utilizing a laser-induced thermal imaging (LITI) technique for patterning and transferring a transfer layer on a donor film
Data Source
AI summary
A method of manufacturing an organic light-emitting display apparatus according to a laser-induced thermal imaging (LITI) method, the method including patterning a transfer layer arranged on a donor film; disposing the donor film on an acceptor substrate; laminating the donor film on the acceptor substrate; transferring the transfer layer of the donor film to the acceptor substrate; and removing the donor film from the acceptor substrate.