Tilted LED Phosphor Layer Light Extraction
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Solution Overview
Problem
Current light emitting device packages face inefficiencies in light extraction due to the absorption or re-reflection of transmitted and reflected light by the phosphor layer, leading to reduced brightness and efficiency.
Innovation Solution
The design incorporates a phosphor layer that extends upward from the package body within a molding layer, positioned between light emitting diodes, which are tilted at specific angles to prevent transmitted and reflected light from being absorbed or re-reflected by the diodes or package body, thereby enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the phosphor layer is positioned to convert light from LEDs, then light conversion function is improved, but transmitted and reflected light are absorbed or re-reflected by the phosphor layer, reducing light extraction efficiency
Solution Approach 1:
The patent extracts the harmful effect of light absorption and re-reflection by the phosphor layer. By positioning the phosphor layer to extend upward from the package body and tilting the LEDs at specific angles, the design extracts transmitted and reflected light away from the phosphor layer, preventing it from being absorbed or re-reflected, thus resolving the contradiction between light conversion function and light extraction efficiency
Solution Approach 2:
The patent changes the spatial arrangement from a conventional planar configuration to a three-dimensional structure where the phosphor layer extends upward and LEDs are tilted at specific angles. This dimensional change creates new light paths that avoid re-absorption by the phosphor layer, simultaneously maintaining light conversion function and improving light extraction efficiency
2Illumination intensity
If LEDs are positioned to emit light through the phosphor layer, then light emission is improved, but transmitted light is absorbed or re-reflected by the phosphor layer, reducing overall efficiency
Solution Approach 1:
The patent introduces asymmetry in the optical path by tilting LEDs at specific angles relative to the phosphor layer. This asymmetric positioning ensures that transmitted and reflected light travel in directions that avoid re-absorption by the phosphor layer, while maintaining effective light emission through the phosphor layer
3Ease of manufacture
If the package body is designed with a conventional flat structure, then manufacturing is simplified, but light extraction efficiency is reduced due to absorption and re-reflection of light
Solution Approach 1:
The patent segments the package body into a base portion and an upward-extending phosphor layer portion. This segmentation allows the phosphor layer to be positioned in a way that extracts light away from absorption zones, improving light extraction efficiency while maintaining relatively simple manufacturing processes for each segment
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 effectively extracts transmitted and reflected light, improving the overall light extraction efficiency and brightness of the light emitting device packages and modules.
Implementation Method 1
a phosphor layer provided on package body, wherein the phosphor layer extends upward from a surface of the package body
Implementation Method 2
The package body may be provided with a first sloped part having a first slope and a second sloped part having a second slope
Data Source
AI summary
A light emitting device package is disclosed. The light emitting device package includes a package body, at least one light emitting diode disposed on the package body, a molding layer surrounding the light emitting diode, and a phosphor layer provided on the package body, wherein the phosphor layer extends upward from surface of the package body.