LED with Insulated Interconnection for AC Drive Stability
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) face issues with current crowding, light absorption by interconnections, and reduced effective light emitting area when connected in series, leading to potential short circuits and inefficiencies in current spreading and light emission.
Innovation Solution
A light emitting diode design featuring a first insulation layer with openings to expose lower semiconductor layers for ohmic contact, a current blocking layer to prevent current crowding, and an interconnection directly connected to the transparent electrode layer without insulating material, enhancing current spreading and reducing light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an air bridge interconnection is used to connect light emitting elements, then the LED can be driven by AC source, but the interconnection is easily broken by external force and may cause short circuit
Solution Approach 1:
The patent introduces an insulating layer as an intermediary substance between the interconnection and the light emitting elements. This insulating layer with controlled openings provides both mechanical protection against external forces and electrical isolation to prevent short circuits, while still allowing the interconnection to function as an AC drive interface.
Solution Approach 2:
The insulating layer is applied beforehand to cover and protect the interconnection structure before final assembly. This preemptive protective measure cushions the interconnection against external mechanical forces and potential short circuit conditions that could arise during operation.
2Reliability
If interconnection is formed on insulation layer covering light emitting cells, then short circuit is prevented, but current crowding occurs and light absorption increases
Solution Approach 1:
The insulating layer is designed with spatially varying properties - it covers certain areas to prevent short circuits while leaving openings in specific locations to allow direct optical paths. This local differentiation of insulating coverage optimizes both electrical isolation and optical transmission characteristics.
Solution Approach 2:
The insulating layer is segmented into covered regions and open regions, creating a patterned structure that allows different functional zones. The openings segment the light path to bypass the interconnection in critical areas while maintaining insulation where needed.
3Reliability
If insulating material is placed between interconnection and transparent electrode layer, then short circuit is prevented, but current spreading is reduced and light emission area decreases
Solution Approach 1:
The insulating material is applied partially rather than completely between the interconnection and transparent electrode layer. By limiting the insulation to specific regions, the design achieves sufficient electrical isolation while leaving other regions open to maintain current spreading and maximize the effective light emitting area.
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 design reduces current crowding, minimizes light absorption, and increases the effective light emitting area, improving the stability and efficiency of the LED when driven by alternating current sources.
Implementation Method 1
a first insulation layer... includes an opening configured to expose a lower semiconductor layer of the first light emitting cell for connection to the interconnection
Data Source
AI summary
A light emitting diode including a first light emitting cell and a second light emitting cell separated from each other on a substrate, a first transparent electrode layer electrically connected to the first light emitting cell, an interconnection electrically connecting the first light emitting cell to the second light emitting cell, and a first insulation layer. The first transparent electrode layer is disposed on an upper surface of the first light emitting cell and partially covers a side surface of the first light emitting cell. The first insulation layer separates the first transparent electrode layer from the side surface of the first light emitting cell, and includes an opening to expose a lower semiconductor layer of the first light emitting cell.