Light Emitting Device Package With Segmented Cavities
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Solution Overview
Problem
Existing light emitting device packages face challenges in achieving uniform color reproduction and simplified driving circuits due to differences in electrical characteristics of multi-color light emitting devices, and limited color reproduction range when using single blue light sources with phosphors.
Innovation Solution
A light emitting device package design that accommodates different phosphors in separate cavities, where each phosphor emits light of varying wavelengths, such as green and red, to generate white light, with a blue light emitting device and a non-phosphor optical member to enhance color reproducibility and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-color light-emitting device is used to synthesize white light, then the color reproduction range is wide, but the driving circuit becomes complicated and uniformity of color cannot be guaranteed
Solution Approach 1:
The patent divides the light-emitting device into multiple separate light-emitting elements (blue, green, red LEDs or laser diodes), each housed in its own cavity. This segmentation allows each element to be independently controlled and optimized, simplifying the driving circuit while maintaining wide color reproduction capability through coordinated operation of the separated elements.
Solution Approach 2:
The patent introduces a reflective cavity structure as an intermediary between the light-emitting elements and the external environment. This reflective cavity mediates the light output from multiple elements, enabling uniform color mixing and distribution without requiring complex driving circuits to manage the interactions between different color sources.
2Device complexity
If a single blue light emitting device with phosphor is used to synthesize white light, then the driving circuit is simplified, but the color reproduction range is narrow and color reproducibility is reduced
Solution Approach 1:
Instead of using a single blue LED with phosphor coating, the patent segments the light source into multiple discrete light-emitting elements (blue, green, red) that can be independently controlled. This segmentation expands the color reproduction range while keeping the driving circuit relatively simple through standardized control of multiple elements.
Solution Approach 2:
The patent employs a composite structure combining multiple light-emitting materials (different LED or laser diode types) within a unified package. This composite approach integrates the advantages of different light sources to achieve broad color reproduction while maintaining manageable circuit complexity through modular design.
3Device complexity
If phosphors are placed in the same cavity, then the structure is simplified, but light re-absorption occurs between phosphors reducing brightness and color quality
Solution Approach 1:
The patent physically separates different phosphors into distinct cavities, preventing light re-absorption between phosphor layers. Each phosphor is excited by dedicated light sources within its own cavity, eliminating the harmful interaction where one phosphor absorbs light from another, thereby maintaining high brightness and color purity.
Solution Approach 2:
The patent extracts the phosphors from a single shared environment and places them in separate, isolated cavities. This extraction eliminates the problematic light re-absorption effect while preserving the beneficial phosphor conversion function, resulting in improved brightness and color quality without significant structural complexity increase.
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 solution achieves improved color reproducibility and brightness by preventing re-absorption of light between phosphors and optimizing light distribution, while maintaining a simplified driving circuit architecture.
Implementation Method 1
a light emitting device generating a blue light
Implementation Method 2
phosphor different from each other accommodated in each of the plurality of cavities, wherein the phosphor different from each other emits a light having wavelength different from each other
Data Source
AI summary
Disclosed herein is a light emitting device package including a light emitting device configured to generate a first light; a body configured to accommodate the light emitting device and comprising a cavity in the body; an optical member configured to divide the cavity into a plurality of cavities including a first cavity and a second cavity; and first phosphor and second phosphor different from the first phosphor accommodated in the first and the second cavities, respectively.