Reflective Electrode Patterning for Low-Loss LED Packages
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Solution Overview
Problem
Existing semiconductor light emitting device packages suffer from significant light loss due to inefficient light emission and reflection mechanisms.
Innovation Solution
The semiconductor light emitting device package incorporates a substrate with a light-emitting area and a non-light-emitting area, featuring a reflective electrode layer with patterns that overlap the active layer in both vertical and horizontal directions, along with a transparent electrode layer and a bonding electrode layer, to enhance light emission and reflection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light emitting device structure is used, then the device structure is simple, but light loss is significant due to inefficient light emission and reflection mechanisms
Solution Approach 1:
The reflective electrode layer is divided into multiple patterns (first, second, third reflective electrode patterns) with different orientations and positions. Each pattern segment reflects light in a specific direction, collectively achieving comprehensive light extraction efficiency improvement while managing structural complexity through functional segmentation
Solution Approach 2:
Different regions of the device are assigned different functional qualities: the first reflective electrode pattern has a first orientation for reflecting light in one direction, the second pattern has a second orientation for another direction, and the third pattern has a third orientation for yet another direction. This local differentiation optimizes light reflection efficiency in various zones without requiring complete structural redesign
2Productivity
If the reflective electrode layer patterns are added to overlap the active layer, then light emission efficiency is improved, but the manufacturing process complexity increases
Solution Approach 1:
The reflective electrode patterns are formed during the manufacturing process before final device assembly, with each pattern pre-positioned to overlap specific regions of the active layer. This preliminary arrangement ensures optimal light reflection geometry is achieved before the device is put into operation, improving light output efficiency while allowing standardized manufacturing procedures to be followed
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 configuration minimizes light loss by optimizing light emission directionality and reflection, thereby improving the overall light output and efficiency of the semiconductor light emitting device package.
Implementation Method 1
a reflective electrode layer including a plurality of patterns electrically connected to the patterns of the transparent electrode layer, respectively, and including portions overlapping the patterns of the active layer
Data Source
AI summary
A semiconductor light emitting device package includes: a substrate; a first semiconductor layer including first regions including a first-type semiconductor material and having a first height, and a second region disposed between the first regions and having a second height lower than the first height; an active layer including disposed in the first regions, and emitting light of a predetermined wavelength band; a second semiconductor layer disposed on the active layer and formed of a second-type semiconductor material; a third semiconductor layer disposed on the second semiconductor layer, and formed of a second-type semiconductor material different from the second-type semiconductor material of the second semiconductor layer; a transparent electrode layer including disposed on the third semiconductor layer; and a reflective electrode layer electrically connected to the transparent electrode layer, respectively, and including portions overlapping the active layer in a vertical direction and a horizontal direction, respectively.