LED Transfer Display Structure With Inorganic Moisture Barrier
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Solution Overview
Problem
Display devices using light emitting diodes face issues during transfer processes, including errors in positioning and vulnerability to moisture and oxygen penetration, which can lead to device deterioration.
Innovation Solution
A display device design incorporating a substrate with a display and non-display area, featuring a pixel driving circuit, insulating layer, bank, light emitting device, electrode, and an optical layer with an inorganic layer between the optical layer and electrode, which helps reduce transfer errors and protect against moisture and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting diodes are transferred during manufacturing, then the display device can be assembled, but positioning errors occur and the devices are vulnerable to moisture and oxygen penetration
Solution Approach 1:
The patent divides the encapsulation structure into multiple segments: an inorganic encapsulation layer and an organic encapsulation layer, with the light emitting device transferred between them. This segmentation allows the transfer process to occur at a controlled stage while maintaining positioning accuracy through the structured assembly process.
Solution Approach 2:
The patent introduces an intermediary structure (the encapsulation layers and underlying substrate structure) that mediates the transfer process. The light emitting device is transferred onto a prepared structure with defined alignment features, acting as an intermediary platform that ensures precise positioning while facilitating the transfer operation.
2Ease of manufacture
If light emitting diodes are transferred during manufacturing, then the display device can be assembled, but the devices are vulnerable to moisture and oxygen penetration
Solution Approach 1:
The patent applies preliminary action by forming the inorganic encapsulation layer and the underlying structure before transferring the light emitting device. This preliminary preparation creates a protected environment that prevents moisture and oxygen exposure during the transfer process, ensuring reliability from the outset.
Solution Approach 2:
The patent uses composite materials by combining inorganic encapsulation layers with organic encapsulation layers. This composite structure provides superior protection against moisture and oxygen penetration compared to single-material encapsulation, while still allowing for a manageable transfer process.
3Reliability
If an inorganic layer is added between the optical layer and electrode, then protection against moisture and oxygen is improved, but the device structure becomes more complex
Solution Approach 1:
The inorganic encapsulation layer serves multiple functions simultaneously: it provides protection against moisture and oxygen, acts as a barrier layer, and integrates with the existing optical and electrode structures. This multi-functionality justifies the added layer without proportionally increasing complexity, as it consolidates several protective roles into a single integrated component.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area, a pixel driving circuit in the display area on the substrate, an insulating layer on the pixel driving circuit, a bank on the insulating layer, a light emitting device disposed on the bank and overlapping the bank, an electrode disposed on the light emitting device and electrically connected to the light emitting device, an optical layer surrounding a side of the light emitting device, and an inorganic layer between the optical layer and the electrode.