Light Fixture Combining PCLEDs and DLEDs for Color Saturation
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Solution Overview
Problem
Conventional light fixtures using phosphor-converted LEDs (PCLEDs) struggle to produce saturated colors due to broadband light emission, while RGB LED fixtures are energy-intensive and render unnatural pastel colors.
Innovation Solution
A light fixture combining PCLEDs for white and pastel light with direct LEDs (DLEDs) for specific saturated colors, allowing for adjustable wavelength range and color saturation by controlling the output of both types of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PCLEDs are used to produce white light, then energy efficiency is improved, but color saturation deteriorates due to broadband light emission
Solution Approach 1:
The light fixture is segmented into multiple independent LED modules, each emitting at a specific wavelength. This allows the system to combine broadband PCLED output (for energy efficiency) with narrowband DLED output (for color saturation) by controlling individual module intensities, thereby resolving the contradiction between energy efficiency and color saturation.
2Illumination intensity
If RGB LED fixtures are used to achieve saturated colors, then color saturation is improved, but energy consumption increases due to multiple LEDs operating simultaneously
Solution Approach 1:
The light fixture uses a single multi-wavelength LED module that can emit across multiple color wavelengths simultaneously. This universal approach replaces the need for separate red, green, and blue LED modules, achieving color saturation with reduced energy consumption by eliminating redundant LED drivers and power circuitry.
3Adaptability or versatility
If RGB LED fixtures are used to produce white light, then color control flexibility is improved, but device complexity increases due to hardware requirements
Solution Approach 1:
Multiple LED modules with different emission wavelengths are merged into a single integrated light fixture unit. This combining approach simplifies the overall hardware architecture by sharing common components such as the power supply, control circuitry, and housing, while maintaining color control flexibility through independent intensity adjustment of each LED module.
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 combination enables good color rendering and saturation with improved energy efficiency, allowing for precise control over the light's spectral content and color output.
Implementation Method 1
A layer of phosphor material is applied onto a surface of the LED. Radiation emitted from the LED is absorbed by the phosphor material. Radiation energy absorbed by the phosphor material is then re-emitted as light having a longer wavelength in the visible range of the electromagnetic spectrum.
Data Source
AI summary
A light fixture includes a first phosphor-converted light-emitting diode (“PCLED”) emitting light in a first PCLED wavelength range having first PCLED upper and lower bounds, a first direct light-emitting diode (“DLED”) emitting light in a first DLED wavelength range having first DLED upper and lower bounds, a second PCLED emitting light in a second PCLED wavelength range having second PCLED upper and lower bounds, and a second DLED emitting light in a second DLED wavelength range having second DLED upper and lower bounds. The first PCLED upper bound has a higher wavelength value than the first DLED upper bound. The first PCLED lower bound has a lower wavelength value than the first DLED lower bound. The second PCLED upper bound has a higher wavelength value than the second DLED upper bound. The second PCLED lower bound has a lower wavelength value than the second DLED lower bound.