Light Emitting Device Package Reflective Structure
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Solution Overview
Problem
Conventional light emitting device packages with a two-dimensional structure lack effective control over vertical light emission distribution, leading to degraded light extraction efficiency.
Innovation Solution
Incorporating a reflective structure around the light emitting device with a side surface angle of inclination between 45° to 90°, formed from insulating materials like oxide films, to control and enhance vertical light emission distribution, combined with a lens and electrode configuration that includes a dielectric reflective structure with varying refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-dimensional package structure with no cavity is used, then the device structure is simple, but the vertical light emission distribution cannot be controlled and light extraction efficiency is degraded
Solution Approach 1:
The patent introduces a three-dimensional cavity structure within the package body to control vertical light emission distribution. This dimensional change from a flat two-dimensional structure to a three-dimensional structure with cavities enables effective manipulation of light extraction efficiency and emission characteristics without significantly increasing overall device complexity
2Loss of energy
If a reflective structure with side surface angle of 45° to 90° is added, then vertical light emission distribution is controlled and light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The reflective structure is applied locally at specific positions within the package cavity rather than throughout the entire structure. By positioning reflective surfaces with specific angles (45° to 90°) only where needed to control vertical light emission, the patent achieves improved light extraction efficiency while minimizing the increase in overall device complexity
3Manufacturing precision
If a lens and dielectric reflective structure with varying refractive indices are incorporated, then light emission control is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent employs composite structures combining lens elements with dielectric reflective layers that have varying refractive indices. This composite approach enables enhanced control over light emission characteristics by integrating multiple functional materials with complementary optical properties, achieving superior light control while managing manufacturing complexity through material integration
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
Improves light extraction efficiency by reflecting light emitted from the device at an orientation angle of about 120°, thereby enhancing the overall performance of the light emitting device package and lighting systems.
Implementation Method 1
reflecting light emitted from the device at an orientation angle of about 120°
Implementation Method 2
dielectric reflective structure with varying refractive indices
Data Source
AI summary
Provided are a light emitting device package and a lighting system including the light emitting device package. The light emitting device package includes a package body, at least one electrode on the package body, a light emitting device on the package body, a reflective structure around the light emitting device on the package body and a lens on the light emitting device and the electrode.