Lighting Device With Segmented LED Control For Spectrum Tuning
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Solution Overview
Problem
Existing lighting devices using semiconductor light-emitting elements struggle to control emission intensity and spectrum, limiting their ability to produce white light and spectra suitable for specific applications.
Innovation Solution
A lighting device comprising a first light-emitting device with a specific emission spectrum and multiple second light-emitting devices with different peak wavelengths, controlled by a unit to adjust light intensities and spectra, allowing for the production of white light and spectra mimicking sunlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plurality of semiconductor light-emitting elements emitting light in different wavelength bands are prepared to obtain white light, then white light can be produced, but control of emission intensity and emission spectrum is not achieved
Solution Approach 1:
The lighting device is divided into multiple independent light-emitting units, each equipped with its own control circuit. This segmentation allows individual control of each light-emitting element's emission intensity and wavelength, enabling precise adjustment of the overall emission spectrum and intensity without requiring complex centralized control systems.
2Adaptability or versatility
If multiple phosphors emitting fluorescent light in different wavelength bands are used to obtain white light, then a light source with suitable spectrum can be produced, but control of emission spectrum is not suggested
Solution Approach 1:
The lighting device employs dynamically controllable light-emitting elements that can adjust their emission characteristics in real-time. By independently controlling the intensity and wavelength of each light-emitting unit, the system can dynamically adapt the emission spectrum to match different application requirements, such as simulating natural sunlight or providing optimized illumination for specific tasks.
3Use of energy by moving object
If semiconductor light-emitting elements are used to replace fluorescent lamps, then energy efficiency is improved, but the ability to emit one color only limits white light production
Solution Approach 1:
The patent combines multiple semiconductor light-emitting elements with different emission wavelengths into a single integrated lighting device. By merging red, green, and blue light-emitting elements (or other wavelength combinations), the system produces white light while maintaining the high energy efficiency of semiconductor LEDs. The control circuits coordinate these merged elements to achieve desired color temperatures and emission spectra.
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 precise control over light emission spectra, improving color rendering properties and simulating natural light conditions for various applications, including indoor illumination and appearance inspection.
Implementation Method 1
lighting devices including semiconductor light-emitting elements, such as light emitting diodes (LEDs), as light sources
Implementation Method 2
a plurality of phosphors that emit fluorescent light in different wavelength bands in response to excitation light
Data Source
AI summary
A lighting device includes a first light-emitting device, a plurality of second light-emitting devices, and a control unit. The first light-emitting device has a first emission spectrum that has a first peak wavelength in a wavelength range from 360 nm to 430 nm and in which a light intensity continuously decreases with decreasing wavelength from the first peak wavelength and with increasing wavelength from the first peak wavelength. Each of the plurality of second light-emitting devices has a second emission spectrum with a second peak wavelength in the range from 360 nm to 430 nm, that has a third peak wavelength in a range from the second peak wavelength to 750 nm, and in which a light intensity continuously decreases with decreasing wavelength from the second peak wavelength and with increasing wavelength from the third peak wavelength. The control unit controls all of the light-emitting devices.