Display Apparatus Encapsulation Structure for Thin Moisture Protection
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in achieving enhanced encapsulation characteristics while maintaining a relatively small thickness, which is crucial for applications in both small and large products.
Innovation Solution
The display apparatus includes a first and second pixel electrode spaced apart, a pixel definition layer with an opening, an intermediate layer with a through hole, an opposite electrode facing the pixel electrodes, and an inorganic encapsulation layer directly contacting the pixel definition layer through the through hole, with a spacer between the electrodes, and a multilayer inorganic encapsulation structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional encapsulation structure is used, then encapsulation characteristics are improved, but the thickness of the display apparatus increases
Solution Approach 1:
The encapsulation structure is divided into multiple inorganic encapsulation layers (first, second, and third inorganic encapsulation layers) with different thicknesses and positions. The first inorganic encapsulation layer has greater thickness at edges than at the center, the second layer provides additional edge protection, and the third layer covers the entire surface. This segmented approach provides enhanced encapsulation at critical edge regions while maintaining overall thinness, resolving the contradiction between encapsulation effectiveness and thickness.
Solution Approach 2:
Different regions of the encapsulation structure have different thicknesses tailored to local needs. The first inorganic encapsulation layer has a first thickness at the edge region and a second thickness at the central region, where the first thickness is greater than the second thickness. This local quality variation provides enhanced protection at edges where moisture and impurities are more likely to penetrate, while keeping the central region thinner to reduce overall thickness.
2Reliability
If multiple encapsulation layers are added to improve moisture resistance, then encapsulation characteristics are improved, but device complexity increases
Solution Approach 1:
Each inorganic encapsulation layer serves multiple functions: the first inorganic encapsulation layer provides both edge protection and partial central coverage, the second inorganic encapsulation layer reinforces edge protection and bridges gaps, and the third inorganic encapsulation layer provides comprehensive coverage. This multi-functionality reduces the need for additional specialized layers, maintaining relatively simple device structure while achieving enhanced moisture resistance through the coordinated action of these versatile layers.
Data Source
AI summary
A display apparatus includes: a first pixel electrode and a second pixel electrode spaced apart from each other on a substrate; a pixel definition layer including an opening exposing a central portion of each of the first pixel electrode and the second pixel electrode; an intermediate layer on the first pixel electrode, the second pixel electrode, and the pixel definition layer and including a through hole exposing at least a portion of an upper surface of the pixel definition layer between the first pixel electrode and the second pixel electrode; an opposite electrode on the intermediate layer to face the first pixel electrode and the second pixel electrode; and an inorganic encapsulation layer over the opposite electrode.