OLED Transfer Layer Lifting Prevention via Asymmetric Tensile Force
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Solution Overview
Problem
In the fabrication of OLED display devices, the separation of the donor film from the acceptor substrate during the transfer of the organic layer can lead to lifting of the transfer layer due to adhesion and tensile force, especially when the force is applied perpendicular to the long side of the pixel opening, resulting in a large region of lifting and inefficiency in the transfer process.
Innovation Solution
Applying a tensile force to the donor film in a direction perpendicular to the short sides of the pixel openings during the transfer of the transfer layer, reducing the stress on the long sides and minimizing the region affected by the force, thereby reducing the likelihood of lifting and enhancing the transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tensile force is applied perpendicular to the long side of pixel openings, then the transfer layer can be separated from the donor film, but lifting occurs due to stress concentration on the long sides
Solution Approach 1:
The patent applies tensile force perpendicular to the short sides of pixel openings rather than the long sides, creating an asymmetric force application pattern that reduces stress concentration and prevents lifting of the transfer layer during the separation process
2Productivity
If tensile force is applied to separate the donor film from the acceptor substrate, then the transfer layer is transferred, but lifting occurs due to adhesion between layers
Solution Approach 1:
By applying tensile force perpendicular to the short sides of pixel openings, the patent creates a more favorable stress distribution that maintains transfer layer integrity while enabling efficient transfer, avoiding the lifting problems that occur with conventional force application directions
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 method effectively minimizes the region influenced by the tensile force and reduces the lifting phenomenon, improving the efficiency of transferring the transfer layer and ensuring a more reliable formation of the organic layer in OLED display devices.
Implementation Method 1
irradiating a donor film including a light-to-heat conversion layer and a transfer layer formed on the light-to-heat conversion layer with a laser beam such that laser energy is converted into thermal energy by the light-to-heat conversion layer
Data Source
AI summary
An organic layer of an organic light emitting diode (OLED) display device is formed by transferring a transfer layer of a donor film to aligned pixel openings in a pixel defining region of the OLED display device such that the organic layer is formed in the pixel openings. Each aligned pixel opening has a pair of long sides and a pair of short sides, and the transferring of the transfer layer is performed by applying tensile force to the donor film in a direction perpendicular to the short sides of the pixel openings.