Layered LED Electrode Layout to Prevent Short Circuits
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Solution Overview
Problem
Existing light emitting devices face challenges in preventing short-circuit defects between electrodes and ensuring stable arrangement of light emitting diodes, leading to reduced efficiency and lifetime.
Innovation Solution
A light emitting device design featuring a substrate with a first and second electrode on different layers, separated by an insulating layer, and a method of fabricating this device where light emitting diodes are aligned between the electrodes using a contact electrode connection, preventing short-circuit defects and enhancing electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrodes are disposed on the same layer to simplify structure, then device complexity is reduced, but short-circuit defects occur between electrodes
Solution Approach 1:
The patent transitions from a planar arrangement where both electrodes are on the same layer to a three-dimensional arrangement where electrodes are on different layers separated by an insulating layer. This dimensional change eliminates the short-circuit risk while maintaining structural simplicity through systematic layering.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first and second electrodes. This intermediate layer physically separates the electrodes, preventing direct contact and short-circuit defects while allowing both electrodes to coexist in the device structure.
2Productivity
If light emitting diodes are arranged closely to increase density, then productivity is improved, but stable arrangement becomes difficult
Solution Approach 1:
The patent utilizes vertical layering to arrange light emitting diodes at different heights and positions, enabling high-density packing while maintaining stable arrangement. The multi-layer electrode structure provides distinct mounting positions that prevent misalignment and ensure precise positioning.
3Reliability
If an insulating layer is added between electrodes to prevent short-circuit, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation between electrodes, acts as a structural support for positioning electrodes on different layers, and facilitates the overall device architecture. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
A light emitting device may include a first electrode disposed on a substrate; a first insulating layer disposed on the substrate and overlapping at least a part of the first electrode; a second electrode disposed on the first insulating layer and spaced apart from the first electrode; and at least one light emitting diode electrically connected between the first electrode and the second electrode. The first electrode and the second electrode may be disposed on different layers on the substrate, the first insulating layer is disposed between the first electrode and the second electrode, and the first electrode and the second electrode are spaced apart from each other so as not to overlap each other in a plan view.