OLED Pad Area Rolling Prevention via Laser Separation
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Solution Overview
Problem
The existing methods for fabricating organic light emitting display (OLED) devices face issues with stress between the base film and inorganic films due to thermal expansion coefficient differences, leading to the rolling of the pad area after separation from the auxiliary substrate.
Innovation Solution
The OLED device incorporates a base film with a display area and extended first and second pad areas, where thin film transistors and organic light emitting diodes are prepared, and an encapsulation layer is used, with source and gate flexible films attached to the pads, allowing for laser separation without rolling by providing sufficient space and reducing thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base film is separated from the auxiliary substrate after fabricating the thin film transistor with inorganic films, then the OLED device can be completed, but the pad area becomes rolled due to thermal expansion coefficient differences
Solution Approach 1:
The pad area is extended beyond the display area boundaries before the separation process. This preliminary extension provides extra space that compensates for the rolling effect that occurs during separation, ensuring the pad area remains functional and intact after the base film is separated from the auxiliary substrate.
Solution Approach 2:
The geometry of the pad area is changed by extending it beyond the display area boundaries. This parameter change in the pad area's spatial configuration allows it to accommodate the stress and deformation that occurs during separation, preventing rolling while maintaining electrical connectivity.
2Ease of manufacture
If the base film has a different thermal expansion coefficient from inorganic films, then thermal stress is generated during fabrication, but this stress causes rolling after separation
Solution Approach 1:
The pad area is extended in advance before the thermal stress and separation process occurs. This preliminary geometric adjustment provides a buffer zone that absorbs the thermal stress-induced deformation, preventing the stress from causing rolling of the pad area after separation.
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 effectively prevents the pad area of the OLED device from rolling or bending after separation, ensuring the integrity and functionality of the display panel.
Implementation Method 1
separating the base film from the auxiliary substrate through the use of laser
Data Source
AI summary
A method for fabricating a display device can include providing a base film on an auxiliary substrate, in which the base film includes a display area, and a first pad area; providing a plurality of thin film transistors on the display area of the base film; providing first pads on the first pad area of the base film; providing a plurality of organic light emitting diodes connected with the plurality of thin film transistors; providing an encapsulation layer for covering the plurality of organic light emitting diodes; attaching a plurality of source flexible films onto the first pads, respectively; separating the base film from the auxiliary substrate; and cutting a part of the base film between each of the plurality of source flexible films.