LED Magnetic-Source Layer Current Redirection
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) suffer from reduced light uniformity and output efficiency due to non-uniform current density distribution and the blocking effect of non-transparent top electrodes, which obstruct light emission at the central region with the highest intensity.
Innovation Solution
Integration of a magnetic-source layer within the light emitting device structure to utilize the Hall Effect mechanism, allowing for the arrangement of electrodes and creation of a self-supplied magnetic field that shifts current flow to enhance light emission efficiency, thereby improving light outputting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a non-transparent top electrode is positioned at the center region of the light emitting area, then the current density under the top electrode is larger and more light is emitted, but the emitted light is blocked by the top electrode resulting in reduction of output light
Solution Approach 1:
The patent extracts the magnetic field generation function from external devices and integrates it into the LED structure itself through a magnetic-source layer. This allows the magnetic field to be generated internally at the precise location needed (under the top electrode) to redirect current flow away from the blocking electrode, solving the contradiction between achieving high current density and maintaining light output.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the top electrode and the current flow. The magnetic field acts as a mediator that redirects the current path laterally through the Hall effect, allowing high current density to be maintained under the electrode for efficient light generation while the magnetic field prevents direct collision with the blocking electrode, thus preserving light output.
2Productivity
If current density is not uniformly distributed to the whole light emitting area, then the light output efficiency can be improved by concentrating current, but the light uniformity is reduced
Solution Approach 1:
The patent applies local quality by creating a non-uniform magnetic field distribution through the magnetic-source layer that is positioned specifically under the top electrode. This localized magnetic field generates a Hall effect that redirects current flow in the specific region where it is needed, concentrating current density at the electrode location to improve light output efficiency while maintaining acceptable light uniformity in other regions.
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 magnetic field ensures more effective current flow through the active layer, increasing light emission efficiency and allowing for improved packaging and operation of LEDs as self-supplied magnetic field devices, enhancing light output without external magnetic field application.
Implementation Method 1
uses the mechanism to Hall Effect to arrange the position of the electrode, so as to at least improve light outputting efficiency
Implementation Method 2
The first magnetic-source layer is integrated with the light-emitting structure to produce a magnetic field in the light-emitting structure
Data Source
AI summary
A light emitting device with magnetic field includes a light-emitting structure and a first magnetic-source layer. The light-emitting structure includes a first doped structural layer, a second doped structural layer, an active layer between the two doped structural layers, a first electrode, and a second electrode. The first magnetic-source layer is integrated with the light-emitting structure to produce a magnetic field in the light-emitting structure. The magnetic field transversely shifts a driving current of the light-emitting structure to redistribute in the light-emitting structure.