Organic EL Device Electrode Taking-Out Portion Formation
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Solution Overview
Problem
Existing organic EL device manufacturing methods are inefficient due to the complexity of forming electrode taking-out portions, particularly when using the roll-to-roll process.
Innovation Solution
The organic EL device design includes a first substrate with an organic layer and a second translucent substrate with an electrode layer, where the electrode layer extends beyond the organic layer's region, allowing it to be exposed and forming an electrode taking-out portion by removing the first substrate, and is sealed using an adhesive and insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the anode and light emitting layer are patterned in complicated shapes to form an electrode taking-out portion, then the electrode taking-out portion can be formed, but the manufacturing efficiency decreases
Solution Approach 1:
The device is divided into a light-emitting region and a non-light-emitting peripheral region. The electrode taking-out portion is formed by extending the anode into the peripheral region where the light emitting layer is not formed, allowing separate processing of these regions and simplifying the formation of the electrode taking-out portion without requiring complicated patterning of the light emitting layer.
Solution Approach 2:
The electrode taking-out portion is extracted as a separate functional element by extending the anode beyond the light emitting layer region. This allows the anode to serve dual purposes: as the transparent electrode in the light-emitting region and as the electrode taking-out portion in the peripheral region, eliminating the need for complex patterning.
2Reliability
If a transparent electrode such as ITO is formed as an anode on a glass substrate, then the device can function properly, but the manufacturing process becomes complex when forming electrode taking-out portions
Solution Approach 1:
The transparent electrode (anode) is designed to perform multiple functions: it serves as the transparent electrode in the light-emitting region and simultaneously extends into the peripheral region to form the electrode taking-out portion. This multi-functional design simplifies the overall device structure by eliminating the need for separate electrode taking-out structures.
Solution Approach 2:
The anode is extended in the planar dimension beyond the light emitting layer boundary into the peripheral region. This dimensional extension allows the electrode to reach external terminals without requiring vertical stacking or complex three-dimensional structures, maintaining simplicity while achieving the electrode taking-out function.
Data Source
AI summary
An organic EL device includes: a first substrate having electrical conductivity; an organic layer formed on the first substrate; a second substrate having translucency; and an electrode layer formed on the second substrate. The electrode layer on the first substrate and the organic layer on the second substrate contact each other. The organic layer is not formed in the peripheral portion of the second substrate. In the region where the organic layer is not formed, a portion of the electrode layer is provided to extend, and the first substrate is not present to face the extended electrode layer, and the portion of the electrode layer is exposed to form an electrode portion. Thus, the electrode portion can be formed by a simple procedure in which, for example, the first substrate is removed, and the organic EL device can be efficiently manufactured.