LED Chip Continuous Frame Electrode for Uniform Light Emission
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Solution Overview
Problem
Conventional light-emitting diode (LED) structures with penetrating electrodes reduce the effective light-emitting area and lead to uneven light emission, resulting in lower luminous efficiency.
Innovation Solution
A light-emitting chip design featuring a conductive carrier, semiconductor layers, and a continuous electrode structure with a frame and strip structure that extends into the chip, allowing for improved current spreading and reduced electrode area, thereby enhancing light-emitting efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple penetrating electrodes are used to connect the N-type semiconductor layer and negative electrode, then the voltage required for the N-type semiconductor layer can be supplied, but the effective light-emitting area is reduced and light emission becomes uneven
Solution Approach 1:
The patent segments the electrode structure into a frame-shaped electrode at the edge region and a bottom layer electrode in the interior region. This segmentation allows the electrode to connect the N-type semiconductor layer and negative electrode effectively while minimizing the coverage area on the light-emitting surface, thus resolving the contradiction between voltage supply capability and effective light-emitting area.
Solution Approach 2:
The patent moves the electrode structure from a planar configuration to a three-dimensional configuration by creating a frame-shaped electrode at the edge region and a bottom layer electrode in the interior region. This dimensional change allows the electrode to maintain electrical connectivity while reducing its footprint on the light-emitting surface, thereby increasing the effective light-emitting area.
2Ease of operation
If multiple penetrating electrodes are used to connect the N-type semiconductor layer and negative electrode, then the voltage required for the N-type semiconductor layer can be supplied, but the light emission at the edges becomes uneven
Solution Approach 1:
The patent segments the electrode structure into a frame-shaped electrode at the edge region and a bottom layer electrode in the interior region. This segmentation ensures uniform current distribution across the light-emitting surface, as the frame-shaped electrode at the edge region prevents current concentration at the boundaries, thereby achieving uniform light emission while maintaining voltage supply capability.
Solution Approach 2:
The patent applies different electrode configurations to different regions: a frame-shaped electrode at the edge region and a bottom layer electrode in the interior region. This local differentiation optimizes current distribution, ensuring uniform light emission across the entire light-emitting surface while maintaining effective voltage supply to the N-type semiconductor layer.
3Ease of manufacture
If the surface of the N-type semiconductor layer directly serves as the light-emitting surface with no electrode, then electrode interference with phosphor powder coating is avoided, but the effective light-emitting area is reduced due to penetrating electrodes
Solution Approach 1:
The patent segments the electrode structure into a frame-shaped electrode at the edge region and a bottom layer electrode in the interior region. This segmentation minimizes the electrode's presence on the light-emitting surface, allowing phosphor powder to be coated uniformly without electrode interference while maintaining effective electrical connectivity, thus resolving the contradiction between ease of manufacture and effective light-emitting area.
Solution Approach 2:
The patent moves the electrode structure to the edge region and interior region, away from the central light-emitting surface. This spatial repositioning allows the phosphor powder to be coated on the light-emitting surface without interference from penetrating electrodes, while the electrode structure maintains its voltage supply function through the frame-shaped and bottom layer configurations.
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 increases the light-emitting area and improves current spreading, resulting in higher luminous efficiency and more uniform light emission compared to traditional LED structures.
Implementation Method 1
LED is a luminescent light-emitting element whose principle of luminescence is to apply a forward bias (current) on a III-V compound semiconductor material, and combines electrons and holes in a dipole to convert energy into light
Data Source
AI summary
The invention provides a light emitting chip comprising a conductive carrier, a semiconductor layer body having a first semiconductor layer, a second semiconductor layer, and a radiation emitting layer, wherein the semiconductor layer has a concave part extending from the surface of the first semiconductor layer through the radiation emitting layer toward the second semiconductor layer; a first electrical connection layer electrically connected between the first semiconductor layer and the first electrode; a second electrical connection layer electrically connected between the second semiconductor layer and the conductive carrier, wherein the second electrical connection layer includes a continuous electrode structure connected to the second semiconductor layer, the continuous electrode structure being constituted by at least a frame structure distributed at the edge of the light emitting chip; and a second electrode electrically connected to the conductive carrier.