OLED Panel Moisture Intrusion Delay via Uneven Boundary
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting diode (OLED) panels are vulnerable to moisture intrusion, which leads to degradation and reduced life characteristics due to the boundary surface between the passivation pattern and the adhesive layer in the dummy area.
Innovation Solution
The OLED panel design includes an array area and a dummy area with an uneven boundary surface between the passivation pattern and the adhesive layer, or a 3D structure for the adhesive layer's lower surface, increasing the moisture intrusion path and acting as a barrier to prevent degradation, featuring auxiliary wiring patterns, electrodes, and encapsulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat boundary surface is used between the passivation pattern and adhesive layer, then the manufacturing process is simple, but moisture intrusion occurs easily leading to OLED degradation
Solution Approach 1:
The patent transforms the flat 2D boundary surface into a 3D uneven surface by introducing protrusions and recesses. This dimensional change increases the moisture intrusion path length and creates physical barriers, effectively delaying moisture penetration into the OLED structure while maintaining manufacturing feasibility through standard photolithography and deposition processes.
Solution Approach 2:
The patent introduces curved surfaces through protrusions and recesses instead of flat planes. These curved geometries create tortuous paths for moisture diffusion and enhance the barrier effect, as moisture must navigate around the curved surfaces rather than traveling in a straight line, thereby improving moisture resistance.
2Area of stationary object
If the dummy area is minimized, then the emission area is maximized, but the moisture intrusion path is shortened reducing protection effectiveness
Solution Approach 1:
By creating vertical protrusions and recesses within the dummy area, the patent effectively increases the moisture intrusion path length without increasing the horizontal footprint. This allows the emission area to remain maximized while the 3D structure provides extended protection against moisture.
Solution Approach 2:
The patent nests multiple protective features (protrusions, recesses, adhesive layer modifications) within the existing dummy area boundary. These nested structures create multiple barriers to moisture intrusion without requiring additional lateral space, thus preserving the emission area while enhancing protection.
3Reliability
If standard encapsulation is used, then the manufacturing process is simple, but the OLED is vulnerable to moisture at the boundary surface
Solution Approach 1:
The patent incorporates moisture protection features (uneven surface structures) during the initial encapsulation process rather than adding them later. The protrusions and recesses are formed during the adhesive layer deposition or encapsulation material application, integrating protection into the manufacturing flow without requiring separate complex steps.
Solution Approach 2:
The patent applies different surface characteristics to different regions of the encapsulation structure. The boundary surface between passivation and adhesive layer receives specialized uneven treatment with protrusions and recesses, while other areas maintain standard flat encapsulation, thus providing enhanced local protection where moisture intrusion is most likely without complicating the entire manufacturing process.
Data Source
AI summary
An organic light-emitting diode panel for a lighting device includes a substrate including an array area having an emission area and a dummy area disposed outside the array area, an auxiliary wiring pattern, a first electrode, a passivation pattern, an OLED emission structure, a second electrode, an adhesive layer, and an encapsulation layer. The passivation pattern and the adhesive layer have an uneven boundary surface therebetween in the dummy area. Alternatively, a lower surface of the adhesive layer has a 3D structure. Thus, a moisture intrusion path between the passivation pattern and the adhesive layer of the dummy area of the substrate may be increased. Thus, degradation of the OLED emission structure due to external moisture intrusion may be reduced or prevented.