Island Encapsulation Films for EL Display Protection
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Solution Overview
Problem
Conventional active matrix electro-luminescent displays (AMLEDs) face damage due to water vapor and oxygen infiltration through pinholes in the film layers, leading to widespread device degradation.
Innovation Solution
The electro-luminescent display panel incorporates a protective layer with a buffer layer made of inorganic materials and encapsulation films formed by organic and inorganic materials, where the organic encapsulation films are disconnected and positioned above the pixel electrodes, controlling water vapor and oxygen transmission rates to prevent spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous encapsulation films are used to cover the electro-luminescent device, then the device is protected from water vapor and oxygen, but pin holes in the film layers allow water vapor and oxygen to penetrate and spread, causing large area device damage
Solution Approach 1:
The encapsulation film is divided into multiple isolated island patterns instead of a continuous film. Each island is positioned over a pixel electrode and separated from adjacent islands by gaps corresponding to the pixel definition layer. This segmentation prevents water vapor and oxygen that penetrate through pin holes in one island from spreading to adjacent pixels, thereby containing damage locally while maintaining overall device protection.
2Ease of manufacture
If pin holes are present in the buffer layer, organic layer, and inorganic layer, then the device structure is formed, but water vapor and oxygen can contact the electro-luminescent device through these pin holes causing device damage
Solution Approach 1:
The encapsulation structure provides different protection levels at different locations. The island patterns are positioned specifically over the pixel electrodes where the electro-luminescent devices are located, providing enhanced local protection at these critical areas. The gaps between islands correspond to the pixel definition layer regions, allowing the structure to accommodate the multi-layer film formation process while providing targeted protection where needed most.
Data Source
AI summary
An electro-luminescent display panel including an active device array substrate, a pixel definition layer, electro-luminescent devices, an electrode layer and a protective layer is provided. The substrate includes pixel electrodes. The pixel definition layer on the substrate includes openings, each exposing the corresponding one of the pixel electrodes. The electro-luminescent devices are in the openings. Each electro-luminescent device layer is on the corresponding one of the pixel electrode. The electrode layer is on the pixel definition layer and the electro-luminescent devices. The protective layer including a buffer layer, a first and a second encapsulation films is on the electrode layer. The buffer layer covers the pixel definition layer and the electro-luminescent devices. The first encapsulation film partially covers the buffer layer. The first encapsulation film includes island patterns on the pixel electrodes. The second encapsulation film covers the buffer layer and the first encapsulation film.