LED Light-Emitting Device with Complementary Electrode and Reflective Layer Design
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Solution Overview
Problem
Existing LED manufacturing processes with vertical structures face issues due to the negative impact of current blocking layers on reflective layers, leading to decreased light intensity and performance problems such as current leakage and non-uniform surfaces.
Innovation Solution
An integrated structural design where the contact layer and reflective layer are positioned to form complementary projections with the electrodes, allowing for equivalent current blocking without damaging the reflective layer's functionality, thus preventing light intensity decrease and improving electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current blocking layer is added to prevent current leakage, then electrical reliability is improved, but the reflective layer's functionality is damaged and light intensity decreases
Solution Approach 1:
The patent combines the current blocking layer and reflective layer into a single integrated structure. The reflective layer is positioned to extend beyond the light-emitting unit boundaries, simultaneously serving as both a current blocking barrier and a light-reflecting surface, thereby preventing current leakage while maintaining light intensity
Solution Approach 2:
The reflective layer is extended in the lateral dimension beyond the light-emitting unit footprint. This dimensional extension allows the same layer to perform dual functions: blocking current laterally while reflecting light that escapes at oblique angles, resolving the contradiction between electrical reliability and illumination intensity
2Reliability
If additional current blocking layers are added, then current spreading is improved, but device complexity increases
Solution Approach 1:
The reflective layer is designed to perform multiple functions simultaneously: it reflects light, blocks current laterally, and provides structural support. This multi-functionality eliminates the need for separate current blocking layers, improving current spreading while reducing device complexity
Solution Approach 2:
By merging the current blocking function into the existing reflective layer structure, the patent reduces the total number of discrete layers and simplifies the manufacturing process while achieving effective current spreading across the device
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 spreading and light emission efficiency by eliminating the need for additional current blocking layers, reducing current leakage, and maintaining the reflective layer's effectiveness, thereby improving LED performance and manufacturing efficiency.
Implementation Method 1
a reflective layer disposed on the substrate
Implementation Method 2
The patterned contact layer and the light-emitting unit form an ohmic contact
Data Source
AI summary
A light-emitting device is provided, including: a substrate; a reflective layer disposed on the substrate; a patterned contact layer disposed on the reflective layer; a light-emitting unit disposed on the patterned contact layer; a first electrode disposed on a top surface of the light-emitting unit; and a second electrode disposed on a bottom surface of the light-emitting unit; wherein a projection of the first electrode on the substrate and a projection of the patterned contact layer on the substrate are complementary to each other.