OLED Encapsulation Fracture Control Layer
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Solution Overview
Problem
Organic light-emitting devices face challenges in maintaining reliability due to moisture and oxygen permeation, which can lead to fracture formation in the encapsulation layer, degrading barrier characteristics and causing dark spots.
Innovation Solution
An encapsulation layer structure is introduced, comprising a first inorganic layer with a fracture point and a fracture control layer that seals the fracture, formed by atomic layer deposition with specific density and carbon content to prevent fracture growth and improve barrier characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic encapsulation layer is formed to provide oxygen-proof and moisture-proof characteristics, then the reliability and brightness of the organic light-emitting apparatus are improved, but fracture points may form in the inorganic layer which degrade barrier characteristics and cause dark spots
Solution Approach 1:
A fracture control layer is formed on the inorganic encapsulation layer before the device is put into service. This layer proactively seals potential fracture points that may form during subsequent thermal cycling or operation, preventing them from developing into harmful cracks that would compromise the barrier properties and cause dark spots.
Solution Approach 2:
The fracture control layer acts as an intermediary between the inorganic encapsulation layer and the external environment. It seals fracture points in the inorganic layer, preventing moisture and oxygen from penetrating through the fractures, thus maintaining the protective function of the encapsulation system even when the inorganic layer develops defects.
2Productivity
If the encapsulation layer is made ultrathin to reduce manufacturing cost and improve device performance, then productivity and device quality are improved, but the layer becomes more susceptible to fracture formation
Solution Approach 1:
The fracture control layer is formed as a thin film structure on the inorganic encapsulation layer. This thin film provides fracture sealing functionality without adding significant thickness to the encapsulation system, maintaining the advantages of ultrathin design while compensating for the increased fracture susceptibility through the sealing mechanism.
Solution Approach 2:
The encapsulation system combines the inorganic encapsulation layer (providing barrier properties) with the fracture control layer (providing fracture sealing). This composite structure leverages the complementary strengths of different materials and functions to achieve both ultrathin design and fracture resistance, maintaining productivity and device quality while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively seals fracture points in the inorganic layer, enhancing the encapsulation layer's barrier properties and reducing the occurrence of dark spots by controlling the carbon content and density of the fracture control layer, thereby improving the overall reliability of the organic light-emitting apparatus.
Implementation Method 1
formed by atomic layer deposition with specific density and carbon content to prevent fracture growth and improve barrier characteristics
Data Source
AI summary
An organic light-emitting apparatus including: a substrate; an organic light-emitting device disposed on the substrate and including a first electrode, a second electrode, and an intermediate layer disposed between the first electrode and the second electrode; and an encapsulation layer provided to cover the organic light-emitting device. The encapsulation layer includes a first inorganic layer including a first fracture point, and a first fracture control layer provided on the first inorganic layer to seal the first fracture point.