Protective Film Edge Adhesion for OLED Cathode Integrity
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Solution Overview
Problem
In the manufacturing of organic light emitting display devices, the cathode electrode often separates from the organic light emitting layer during the removal of a protective film, leading to defects in the display device due to inadequate adhesion between the encapsulation layer and the substrate.
Innovation Solution
A method involving the formation of a protective film with a substrate layer and a first adhesive layer at the edge area of the substrate layer, which is designed to prevent separation of the cathode electrode from the organic light emitting layer by ensuring greater adhesion between the encapsulation film and the substrate layer, while maintaining minimal adhesion at the electrode area to avoid separation during the removal process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive layer is deposited on the entire surface of the substrate layer to cover the encapsulation layer, then the protective film provides comprehensive protection during transport, but the cathode electrode separates from the organic light emitting layer when the protective film is removed
Solution Approach 1:
The adhesive layer is applied selectively only to the edge area of the substrate layer rather than the entire surface. This local application ensures the protective film adheres sufficiently for transport protection while preventing excessive adhesion that would cause cathode electrode separation during removal.
2Strength
If the adhesion between encapsulation layer and substrate is increased to prevent separation, then the structural integrity is improved, but the cathode electrode separates from the organic light emitting layer during protective film removal
Solution Approach 1:
The adhesive layer is positioned only at the edge area of the substrate layer, creating a local adhesion zone. This provides sufficient structural integrity for handling and transport while preventing the adhesive from interfering with the cathode electrode and organic light emitting layer interface during protective film removal.
Data Source
AI summary
A display device and a method for manufacturing the same are disclosed, in which a cathode electrode is not separated from an organic light emitting layer. The method includes forming pixels on a display area on a first substrate, forming an encapsulation film to cover the display area, attaching a protective film onto the encapsulation film, and removing the protective film. The protective film includes a substrate layer and an adhesive layer formed at an edge area of at least one side of the substrate layer.