Passivation Film Adhesion in OLED Bezel Regions
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Solution Overview
Problem
The peeling-off phenomenon of the passivation film in the bezel region of organic-based lighting devices leads to moisture penetration and potential short circuits between electrodes, due to inadequate adhesion between the passivation film and the transparent conductive oxide material used in the first electrode.
Innovation Solution
The passivation film is designed to contact both the gate line and the first electrode in the bezel region, leveraging the higher adhesion between the passivation film and metal materials, with the first electrode featuring holes to expose the gate line and increase contact area, thereby enhancing adhesion and reducing peeling-off defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passivation film contacts only the first electrode (transparent conductive oxide) in the bezel region, then the device structure is simpler, but the adhesion between the passivation film and the electrode is insufficient causing peeling-off
Solution Approach 1:
The gate line acts as an intermediary metal layer between the substrate and the first electrode in the bezel region. The passivation film contacts both the gate line and the first electrode, creating a dual-contact structure that improves adhesion. The gate line serves as a mediator that provides additional anchoring points for the passivation film, preventing peeling-off while maintaining structural integrity.
2Reliability
If holes are formed in the first electrode to expose the gate line, then the contact area between passivation film and metal increases improving adhesion, but the manufacturing process becomes more complex
Solution Approach 1:
The first electrode is segmented by forming holes that expose the gate line underneath. This segmentation creates multiple contact regions where the passivation film can adhere to both the metal gate line and the transparent conductive oxide first electrode. The holes divide the continuous electrode structure into discrete contact areas, improving overall adhesion through distributed contact points.
3Object-affected harmful factors
If the passivation film peels off in the bezel region, then moisture and air can penetrate causing short circuits, but preventing this requires better adhesion which increases device complexity
Solution Approach 1:
The dual-contact structure of the passivation film (contacting both gate line and first electrode) serves as a preventive measure against future peeling-off. By establishing strong adhesion points beforehand through the metal gate line contact, the structure cushions against the harmful effects of moisture and air penetration that would otherwise occur during device operation or aging.
Data Source
AI summary
An organic light emitting device comprises an array region including a light-emission area and a non-light-emission area; and a bezel region outside the array region, wherein the array region has a structure where a gate line, a first electrode, a passivation film, an organic light-emission layer, and a second electrode are disposed on a substrate, and wherein the bezel region has a structure where the gate line, the first electrode and the passivation film are stacked on the substrate, and the passivation film contacts both the gate line and the first electrode.