Four-Channel LED Light Engine for Color Tuning and Dimming
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Solution Overview
Problem
Existing lighting technologies require at least five components to achieve chromaticity tunability and dimming of color temperature, which increases cost and complexity, while also aiming for a wide color gamut and suitable luminance.
Innovation Solution
A light emitting device utilizing a combination of a red light emitting unit, a green light emitting unit, and a blue light emitting unit, along with a white light emitting unit, controlled by independent circuits, to tune ambient light and dim color temperature, reducing the number of components needed to four.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If five different components are used to independently complete color tuning and dimming, then chromaticity tunability and color temperature dimming functions are achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple light emitting units (first light emitting unit with blue chip and yellow phosphor, second light emitting unit with blue chip and red phosphor, third light emitting unit with green chip) into a single integrated device. This merging allows the device to achieve chromaticity tuning and color temperature dimming functions that traditionally required five separate components, thereby reducing device complexity while maintaining adaptability.
2Adaptability or versatility
If five different components are used to independently complete color tuning and dimming, then color temperature dimming function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent integrates multiple light emitting units with different phosphor combinations into a single device structure. By merging these units and sharing common components such as the substrate and control circuitry, the patent reduces the total number of discrete components from five to three main units, thereby lowering manufacturing cost while preserving the color temperature dimming function.
3Adaptability or versatility
If narrow FWHM light beams are used for chromaticity tuning, then wide color gamut is achieved, but continuous spectrum for color temperature dimming deteriorates
Solution Approach 1:
The patent applies different phosphor materials with specific emission characteristics to different light emitting units. The first light emitting unit uses yellow phosphor for broad spectrum coverage, the second uses red phosphor for color gamut expansion, and the third uses green chip for precise color control. This local differentiation of phosphor properties allows each unit to contribute specific spectral qualities, achieving both wide color gamut and continuous spectrum simultaneously.
Solution Approach 2:
The patent employs a composite approach by combining multiple phosphor materials (yellow phosphor, red phosphor) with different emission spectra in separate light emitting units. This composite material strategy enables the device to generate a combined spectrum that is both wide in gamut and continuous in distribution, resolving the contradiction between narrow FWHM requirements for color gamut and broad spectrum requirements for color temperature dimming.
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 allows for effective tuning of ambient light and dimming of color temperature with high color rendering indexes, achieving a wide color gamut and reducing costs by using fewer components, while maintaining high brightness and color consistency.
Implementation Method 1
The red light emitting unit includes a first blue light emitting chip and a red fluorescent material
Implementation Method 2
The green light emitting unit includes a third blue light emitting chip and a narrow-wavelength green fluorescent material
Data Source
AI summary
A light emitting device is provided. The device includes a red light emitting unit, a blue light emitting unit, a green light emitting unit, and a white light emitting unit. The red light emitting unit includes a first blue light emitting chip and a red fluorescent material, and a dominant wavelength of a light emitted by the red light emitting unit is in a range of 610 nanometers (nm) to 635 nm. By designing the light emitting device into a structure including the red light emitting unit, the blue light emitting unit, the green light emitting unit and the white light emitting unit, and designing the structure of the red light emitting unit, the light emitting device can realize the adjustment of ambient light and color temperature by the four light emitting units, thereby reducing cost.