OLED Sealing Layer Inner Edge Design for Moisture Barrier
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Solution Overview
Problem
The challenge is to enhance the reliability of organic light emitting devices by preventing moisture intrusion, particularly in downsized devices where the sealing performance is compromised due to narrow frame regions, which can lead to luminance degradation and light emission failures.
Innovation Solution
An organic light emitting device with a sealing layer covering the end of an inorganic material layer on the substrate, forming the sealing layer's end on the inner side of the substrate's transverse direction to prevent moisture ingress and improve sealing performance, while also ensuring reliable cutting and manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the frame region width is reduced to increase productivity, then the number of devices per substrate increases, but the sealing performance deteriorates and moisture intrusion risk increases
Solution Approach 1:
The sealing layer is designed to extend in the longitudinal direction beyond the inorganic material layer, creating an overlapping structure that adds a dimensional element to the sealing approach. This longitudinal extension provides moisture barrier coverage without requiring increased frame region width in the transverse direction, thus maintaining productivity while improving sealing performance.
2Area of stationary object
If the frame region width is reduced to minimize substrate size, then device density increases, but moisture intrusion from substrate ends becomes more severe
Solution Approach 1:
The sealing layer is formed to extend beyond the inorganic material layer in the longitudinal direction before any moisture intrusion can occur. This preliminary extension creates a protective overlap that proactively blocks moisture pathways from the substrate ends, preventing harmful factor intrusion rather than reacting to it.
3Reliability
If the sealing layer extends to the substrate end to improve sealing, then moisture barrier performance improves, but cutting defects and manufacturing issues increase
Solution Approach 1:
The sealing layer exhibits different spatial characteristics: it extends beyond the inorganic material layer in the longitudinal direction to provide moisture barrier coverage, while in the transverse direction it is contained within the substrate boundaries to avoid cutting interference. This localized differentiation of sealing layer properties optimizes both moisture protection and manufacturability.
Data Source
AI summary
Provided is an organic light emitting device, including: a plurality of pixels arranged on a substrate in at least one row along a longitudinal direction of the substrate, each of the plurality of pixels including a light emitting element part including, from the substrate side, a first electrode, an organic compound layer, and a second electrode in the stated order; and a sealing layer formed on the light emitting element part, the sealing layer covering an end of an inorganic material layer formed on a surface of the substrate or above the substrate, and formed below the organic compound layer, the sealing layer having an end formed on an inner side with respect to an end of the substrate at least in a transverse direction of the substrate.