Light Emitting Device with Segmented Phosphor Elements
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Solution Overview
Problem
Conventional light emitting devices have difficulty emitting light across a broad chromaticity range, limiting their color output.
Innovation Solution
The device incorporates a first and second light emitting element with peak emission wavelengths between 430 nm to 480 nm, each with a light transmissive member containing a phosphor, and an encapsulant that covers these members, allowing independent driving and chromaticity adjustment to achieve a broad chromaticity range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single light emitting element with phosphor is used, then the device structure is simple, but the chromaticity range is limited
Solution Approach 1:
The patent divides the light emitting device into multiple independent light emitting elements (first light emitting element and second light emitting element), each with different phosphor compositions. This segmentation allows each element to contribute differently to the overall chromaticity, enabling a broader chromaticity range while maintaining manageable structural complexity through modular design
Solution Approach 2:
Each light emitting element is assigned a specific phosphor composition tailored to its function - the first element uses a phosphor with specific emission characteristics while the second element uses a different phosphor. This local quality differentiation allows each component to optimize its contribution to the overall chromaticity output, achieving broad color range through specialized local configurations
2Adaptability or versatility
If multiple light emitting elements with different phosphors are used, then the chromaticity range is broadened, but the device complexity increases
Solution Approach 1:
The patent merges multiple light emitting elements with different phosphors into a single integrated device structure with a common packaging and control system. The first and second light emitting elements are combined within the same device housing, sharing common electrical connections and control circuitry, which broadens the chromaticity range while preventing excessive complexity through unified integration
Solution Approach 2:
The device structure is designed to accommodate multiple light emitting elements with different phosphor types, making the overall device capable of producing multiple color temperatures (1800K to 7000K). The common packaging and control system serve universal functions for all light emitting elements, allowing the device to perform multiple chromaticity functions without proportionally increasing structural complexity
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
Enables the emission of light across a broad chromaticity range by varying the electric current for each light emitting element, resulting in a device capable of producing light with color temperatures from 1800 to 7000 K.
Implementation Method 1
The first light transmissive member is disposed on an upper face of the first light emitting element and contains a first phosphor. The second light transmissive member is disposed on an upper face of the second light emitting element. The encapsulant covers the first light transmissive member and the second light transmissive member and contains a second phosphor.
Data Source
AI summary
A light emitting device includes: a first light emitting element and a second light emitting element, each having a peak emission wavelength in a range of 430 nm to 480 nm; a first light transmissive member disposed on an upper face of the first light emitting element and containing a first phosphor; a second light transmissive member disposed on an upper face of the second light emitting element; and an encapsulant covering the first light transmissive member and the second light transmissive member and containing a second phosphor. The first light emitting element and the second light emitting element are configured to be independently driven. A chromaticity of light exiting from the first light transmissive member differs from a chromaticity of light exiting from the second light transmissive member.