OLED Protective Layer with Via-Holes for Sealing
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Solution Overview
Problem
Conventional OLED display devices of the active matrix type suffer from degradation due to inadequate sealing, allowing oxygen and moisture to damage the organic electroluminescence layer, which shortens the service life and reduces reliability.
Innovation Solution
The electroluminescence display device incorporates a color filter substrate with a first protective layer that covers the organic electroluminescence layer and second electrode, featuring protrusions and via-holes for connection electrodes, and an array substrate with a protective layer and protrusions for connection to the drain electrode, enhancing sealing and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is used to seal the OLED display device, then the device structure is simple and fabrication is easy, but the sealing effect is insufficient allowing oxygen and moisture to damage the organic electroluminescence layer
Solution Approach 1:
The patent implements a nested protective structure where the protective layer is formed over the organic electroluminescence layer and second electrode, with via-holes penetrating through the protective layer to expose specific regions. This nested configuration (protective layer containing via-holes containing connection electrodes) provides enhanced sealing without significantly complicating the overall device structure, directly resolving the contradiction between improved sealing effect and device complexity.
Solution Approach 2:
The protective layer is formed in advance before final assembly, with via-holes and connection electrodes pre-configured. This preliminary action ensures that the organic electroluminescence layer is protected from oxygen and moisture exposure during fabrication and assembly processes, improving reliability without requiring complex post-fabrication sealing operations.
2Duration of action of stationary object
If the organic electroluminescence layer is exposed to air, then the fabrication process is simple, but oxygen and moisture easily damage the layer reducing service life
Solution Approach 1:
The protective layer is formed as a nested structure over the organic electroluminescence layer, creating a protective enclosure that prevents oxygen and moisture contact. The via-holes are precisely positioned within this protective layer to allow electrical connection while maintaining the protective barrier, thereby extending service life without significantly complicating the fabrication process.
Solution Approach 2:
The protective layer functions as a thin film barrier that flexibly covers the organic electroluminescence layer and second electrode. This thin film structure provides effective protection against oxygen and moisture penetration, extending device service life while maintaining ease of manufacture through standard thin film deposition and patterning techniques.
3Reliability
If connection electrodes are formed through the protective layer, then electrical connectivity is achieved, but the protective layer must be patterned with via-holes increasing fabrication complexity
Solution Approach 1:
The protective layer is segmented by forming via-holes at specific positions to create discrete connection pathways. This segmentation allows electrical connectivity to be achieved through controlled openings while maintaining the protective function in other regions. The via-holes are positioned to connect connection electrodes to the second electrode, ensuring reliable electrical connectivity with manageable fabrication complexity through standard photolithography and etching processes.
Data Source
AI summary
Embodiments of the disclosure disclose an electroluminescence display device and a fabrication method thereof. The device comprises a color filter substrate. The color filter substrate comprises: a first substrate, and a first electrode, an organic electroluminescence layer and a second electrode sequentially provided on the first substrate. The color filter substrate further comprises: a first protective layer, provided on the second electrode and covering the second electrode and the organic electroluminescence layer below the second electrode; and a first connection electrode, provided on the first protective layer and connected to the second electrode.