Light Emitting Device Sidewall Insulation Aperture Ratio
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Solution Overview
Problem
Existing display devices face challenges in improving the aperture ratio of subpixels and suppressing current leakage between electrodes, particularly at the end portions of the layers.
Innovation Solution
A light emitting device with a laminated structure that includes a substrate, a first electrode, a first organic layer, a second electrode, a second organic layer, and a third electrode, where the second electrode acts as a common electrode, and a sidewall insulating layer covers a wall surface portion with a connecting surface formed by aligning the sidewalls of the organic layers, electrodes, and a charge generation layer. The electrode relay portion extends from the third electrode towards the substrate, passing over the outer surface of the wall surface portion via the sidewall insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the end portions of layers are shifted to improve aperture ratio, then the aperture ratio of subpixels is improved, but current leakage occurs between electrodes at the end portion
Solution Approach 1:
An insulating layer is introduced as an intermediary substance between the first electrode and third electrode at the end portion. This insulating layer fills the gap created by the shifted layer configuration, preventing direct electrical contact and current leakage while preserving the aperture ratio improvement benefits of the shifted structure.
Solution Approach 2:
The end portion structure is segmented into distinct functional zones: the shifted organic layers for aperture optimization, and the insulating layer for electrical isolation. This segmentation allows the first electrode and third electrode to be positioned at different heights without direct contact, maintaining both high aperture ratio and reliable current isolation.
2Area of moving object
If a multistage stacked structure is used to form subpixels, then the aperture ratio can be improved, but the structural complexity increases
Solution Approach 1:
The patent merges the aperture optimization function and electrical isolation function into a single integrated structure. The insulating layer is formed as part of the overall stacked structure rather than as a separate additional component, thereby improving aperture ratio while minimizing the increase in structural complexity.
Solution Approach 2:
The insulating layer serves multiple functions simultaneously: it provides electrical isolation between electrodes, fills the gap from shifted layers, and maintains the structural integrity of the stacked configuration. This multi-functionality reduces the need for additional separate components, balancing aperture improvement with structural simplicity.
Data Source
AI summary
Light emitting devices and display devices with improved aperture ratio and suppressed current leakage between electrodes are disclosed. In one example, a light emitting device includes a substrate, a laminated structure, and an electrode relay portion. The laminated structure includes first through third electrodes and first and second organic layers. The second electrode is a common electrode corresponding to the first and third electrodes. A wall surface portion includes a connecting surface in which a sidewall of the first organic layer, a sidewall of the second electrode, and a sidewall of the second organic layer are connected. A sidewall insulating layer covers at least a part of the wall surface portion, and the electrode relay portion extends from the third electrode toward the substrate, and passes over an outer surface of the wall surface portion via the sidewall insulating layer.