LED Electrode Branch Spacing for Uniform Current Diffusion
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Solution Overview
Problem
The existing light-emitting diodes (LEDs) face challenges in achieving uniform current diffusion due to differences in doping concentration between conductive semiconductor layers, which affects their luminous efficacy and brightness.
Innovation Solution
The design involves varying the distance between branches on the second conductive semiconductor layer to separate the first and second conductive semiconductor layers, facilitating uniform current diffusion and improving luminous efficacy by optimizing the spacing between electrode branches and mesa lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the distance between branches is varied to improve current diffusion uniformity, then luminous efficacy is improved, but device structure becomes more complex
Solution Approach 1:
The patent applies local quality by varying the distance between electrode branches in different regions of the device. Specifically, the distance between adjacent branches is different in the first region compared to the second region, creating localized electrical property variations that optimize current diffusion uniformity in specific areas while maintaining overall device performance
Solution Approach 2:
The electrode structure is segmented into multiple branches with different spacing configurations. The first and second regions are divided into multiple sub-regions with distinct branch distance patterns, allowing independent optimization of current distribution characteristics in each segment to improve overall luminous efficacy
2Productivity
If doping concentration difference between conductive layers is increased to improve current diffusion, then current spreading improves, but current uniformity deteriorates
Solution Approach 1:
The patent varies the doping concentration of the active layer in different regions to compensate for the doping concentration difference between conductive layers. By creating local doping variations, the patent optimizes current diffusion efficiency in high-doping regions while maintaining current uniformity in other areas, effectively resolving the contradiction between diffusion efficiency and uniformity
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
This approach enhances the luminous efficacy of LEDs by maintaining optimal current spreading and recombination efficiency, as demonstrated by the specified range of second distance (20 μm to 50 μm) for improved light output efficiency and forward voltage.
Implementation Method 1
A light-emitting diode (LED) is a device which converts electric signals into light using characteristics of compound semiconductors
Data Source
AI summary
A light-emitting device may include a light-emitting structure, a first electrode formed on the first conductive semiconductor layer, and a second electrode formed on the second conductive semiconductor layer. The first electrode may include a first pad, and a first branch coupled to the first pad and extending in a longitudinal direction. The second electrode may include a second pad, and a third branch and a fourth branch that are connected to the second pad and extend from the second pad.