Light Emitting Device Current Blocking Layer Uniformity
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Solution Overview
Problem
Existing light emitting devices face inefficiencies in current distribution, leading to non-uniform light emission due to current concentration in the shortest current path, which affects overall light emitting efficiency.
Innovation Solution
Incorporation of a current blocking layer (CBL) around the circumference of the insulation layer to spread the current into a peripheral region, maximizing light emitting efficiency by preventing current concentration and ensuring uniform distribution across the first conductive type semiconductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flows through the shortest current path, then electrical connection is achieved, but current concentration occurs leading to non-uniform light emission
Solution Approach 1:
The patent applies local quality by creating different current blocking characteristics in different regions. The insulation layer has varying thickness (first thickness in contact region, second thickness in non-contact region), and the current blocking layer is selectively positioned in the circumference region. This local variation in structure creates different current distribution characteristics across the device, blocking current in the shortest path region while allowing uniform current flow in peripheral regions, thus resolving the contradiction between reliable electrical connection and uniform light emission.
2Productivity
If current is concentrated in the shortest current path, then electrical connection is efficient, but light emitting efficiency decreases due to non-uniform distribution
Solution Approach 1:
The patent segments the current flow path into multiple regions using the insulation layer and current blocking layer. The insulation layer divides the contact region from the non-contact region, while the current blocking layer further segments the circumference region. This segmentation prevents current concentration in a single shortest path and distributes current across multiple pathways, improving light emitting efficiency while maintaining overall electrical connection efficiency through the structured segmentation.
3Loss of energy
If a current blocking layer is added to spread current, then light emitting efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the current blocking layer and insulation layer structures. These layers simultaneously provide electrical insulation, current distribution control, and structural support. By combining these functions into integrated layers rather than separate components, the patent achieves improved light emitting efficiency through current spreading while minimizing the increase in device complexity through functional integration.
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 current blocking layer effectively distributes current uniformly, enhancing light extraction efficiency and improving the overall performance of the light emitting device.
Implementation Method 1
a current blocking layer (CBL) around the circumference of the insulation layer to spread the current into a peripheral region
Implementation Method 2
a light emitting structure (135) including a first conductive type semiconductor layer (110), an active layer (120), and a second conductive type semiconductor layer (130)
Data Source
AI summary
A light emitting device is provided that includes a light emitting structure (including a first conductive type semiconductor layer, an active layer, and a second conductive type semiconductor layer), a conductive layer, an insulation layer, and a current blocking layer. The conductive layer may have a first conductive portion that passes through the second conductive type semiconductor layer and the active layer to contact the first conductive type semiconductor layer. The insulation layer may have a first insulation portion that surrounds the first conductive portion of the conductive layer. The current blocking layer may substantially surround the first insulation portion of the insulation layer, the first insulation portion provided between the current blocking layer and the first conductive portion.