Multi-Electrode Light-Emitting Chip for Uniform Current Spread
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Solution Overview
Problem
Conventional light-emitting chips face challenges with high current density, leading to issues such as local heat accumulation and brightness reduction due to inadequate current distribution and thermal management.
Innovation Solution
The light-emitting chip design includes a light-emitting unit with a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer, along with a first electrode unit and a second electrode unit. The electrodes are spaced apart to optimize current distribution, reducing heat accumulation and improving brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode layout (1P1N) is used, then device complexity is low, but current distribution is inadequate leading to local heat accumulation
Solution Approach 1:
The patent divides the single positive electrode into multiple positive electrodes (at least two) and the single negative electrode into multiple negative electrodes (at least two), creating a multi-electrode layout. This segmentation allows current to be distributed across multiple entry and exit points, preventing local heat accumulation and improving current uniformity throughout the semiconductor layer.
Solution Approach 2:
The patent optimizes the spatial arrangement of electrodes by controlling distance relationships: the distance between positive electrodes is greater than the distance between adjacent positive and negative electrodes. This creates non-uniform local electrode spacing that directs current flow patterns, ensuring better current distribution in regions that would otherwise experience heat accumulation.
2Illumination intensity
If high current density is applied, then brightness and photoelectric efficiency improve, but heat accumulation increases
Solution Approach 1:
By segmenting electrodes into multiple positive and negative terminals, the patent distributes the high current density across multiple contact points rather than concentrating it at single electrodes. This allows the device to operate at high overall current density for improved brightness while preventing localized overheating at any single electrode interface.
Solution Approach 2:
The patent transitions from a conventional single-pair electrode configuration to a multi-pair electrode arrangement, adding spatial dimensionality to current entry and exit points. This dimensional expansion of the electrode system allows high current density to be maintained while distributing thermal load across multiple locations, effectively managing heat accumulation.
3Area of stationary object
If electrode spacing is reduced, then device area is minimized, but current distribution deteriorates
Solution Approach 1:
The patent implements asymmetric electrode spacing where the distance between positive electrodes is intentionally made greater than the distance between adjacent positive and negative electrodes. This local variation in spacing optimizes current distribution by creating appropriate current density gradients, ensuring reliable current flow while maintaining compact overall device dimensions.
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 design enhances current spread, reduces heat accumulation, and improves brightness, resulting in improved photoelectric efficiency and reliability under high current conditions.
Implementation Method 1
The first electrical connection layer 14 contacts at least a part of a bottom portion of the first conductivity type semiconductor layer 131, and is disposed between the first conductivity type semiconductor layer 131 and a permanent substrate 10
Implementation Method 2
a light-emitting unit 23, a first electrode unit 21, and a second electrode unit 22... The light-emitting unit 23 includes a first conductivity type semiconductor layer 231, an active layer 233, and a second conductivity type semiconductor layer 232
Data Source
AI summary
A light-emitting chip includes a light-emitting unit, first and second electrode units. The light-emitting unit includes first and second conductivity type semiconductor layers and an active layer. The first electrode unit includes two first electrodes which are spaced apart from each other by a first distance, and which are electrically connected to the first conductivity type semiconductor layer. The second electrode unit includes two second electrodes electrically connected to the second conductivity type semiconductor layer. The first and second electrode units are spaced apart from each other by a second distance, and the first distance is greater than the second distance.