OLED Insulation Film Adhesion Enhancement Pattern
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face issues with external moisture intrusion due to weak interfacial adhesion between the insulation film and passivation layers, leading to rolling phenomena and crack generation in the passivation layer, which compromises the device's reliability and lifespan.
Innovation Solution
The formation of an adhesion enhancement pattern, typically a metal oxide material, under the edge of the insulation film to enhance interfacial adhesion and prevent rolling, combined with a second adhesion enhancement pattern at the edge of the second insulation film to prevent direct contact with the passivation layer, thereby blocking moisture intrusion paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an insulation film is formed on the passivation layer to define emission regions, then the emission regions can expose the first electrodes, but the interfacial adhesion between the insulation film and passivation layer becomes weak, causing rolling phenomena and crack generation
Solution Approach 1:
An adhesion enhancement layer is introduced between the insulation film and the passivation layer to serve as an intermediary that strengthens the interfacial adhesion. This layer prevents the rolling phenomena and crack generation that occur due to weak adhesion, while still allowing the insulation film to properly define the emission regions.
Solution Approach 2:
The structure uses composite materials by combining the insulation film, adhesion enhancement layer, and passivation layer into a multi-layer composite structure. This composite approach leverages the specific properties of each material to achieve both precise emission region definition and strong interfacial adhesion.
2Object-affected harmful factors
If the passivation layer is formed to protect elements against moisture and gas, then protection is provided, but cracks generated due to rolling phenomena create intrusion paths for external moisture
Solution Approach 1:
The adhesion enhancement layer is placed beforehand between the insulation film and passivation layer to prevent the rolling phenomena and subsequent crack generation. This prior cushioning ensures that the passivation layer remains intact and maintains its protective function against moisture and gas intrusion.
3Reliability
If the adhesive layer bonds the sealing substrate to the element substrate, then complete sealing is achieved, but the underlying adhesion issues cause cracking that compromises the sealing
Solution Approach 1:
The adhesion enhancement layer serves as an intermediary that strengthens the internal structure between the insulation film and passivation layer, preventing crack generation. This ensures that the overall sealing structure maintains both completeness and structural integrity under bonding stress.
Data Source
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AI summary
An organic light emitting diode display device is disclosed. The organic light emitting diode display device includes: a substrate configured to include a plurality of pixel regions; a first passivation layer above the substrate; an organic light emitting diode which includes a first electrode formed on the first passivation layer, a first insulation film formed at least partially on the first electrode and configured to define an emission region, and an organic layer and a second electrode formed on the organic layer; a first adhesion enhancement pattern arranged at an end portion or an edge of the insulation film and disposed on the first passivation layer and configured to prevent the end portion or edge of the first insulation film from directly contacting the first passivation layer; and a second passivation layer configured to at least partially cover the organic light emitting diode. In the organic light emitting diode display device, the first adhesion enhancement pattern may be formed on the first passivation layer under the edge of the insulation film. As such, not only a rolling phenomenon of the insulation film but also crack generation in the second passivation layer can be prevented. The contractive property of the organic light emitting diode display device can be enhanced. Moreover, display components can be protected from the intrusion of moisture because the intrusion paths of external moisture can be blocked up.