Remote Phosphor LED Spectrum Simulation
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Solution Overview
Problem
Digital lighting technologies face challenges in replicating the color rendering quality of conventional light sources, particularly tungsten filament, due to inherently discontinuous light spectra, leading to color rendering issues for film emulsions and digital camera sensors.
Innovation Solution
A remote phosphor light system that simulates the desired spectrum of light by using a phosphor device remote from the light source, excited by LEDs, to produce a continuous, linear spectrum matching conventional light sources, such as tungsten or daylight, with consistent color temperature and high Color Rendering Index (CRI), eliminating challenges associated with digital white light for image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED lights with discrete red, green, and blue color spikes are used, then energy efficiency is improved, but color rendering quality deteriorates causing hue shifts in camera work
Solution Approach 1:
The patent segments the light generation process into two distinct stages: first, LEDs generate discrete color spikes (red, green, blue); second, a remote phosphor coating converts these spikes into a continuous spectrum. This segmentation allows each component to be optimized independently - LEDs for energy efficiency and phosphor for color rendering quality.
Solution Approach 2:
The patent introduces a remote phosphor coating as an intermediary between the LED light source and the final illumination. This phosphor layer acts as a mediator that transforms the discrete LED color spikes into a continuous spectrum matching conventional light sources, thereby resolving the color rendering issue while maintaining LED energy efficiency.
2Manufacturing precision
If conventional tungsten light sources are used to achieve continuous spectrum and good color rendering, then color rendering quality is improved, but energy consumption increases
Solution Approach 1:
The patent combines two different light generation mechanisms - LED electroluminescence and phosphor photoluminescence - into a composite lighting system. This composite approach leverages the energy efficiency of LEDs and the continuous spectrum capability of phosphors, achieving both low energy consumption and high color rendering quality.
3Manufacturing precision
If remote phosphor is used to simulate continuous spectrum, then color rendering is improved, but device complexity increases due to additional components and heat dissipation requirements
Solution Approach 1:
The patent extracts the phosphor conversion function from the immediate vicinity of the LED and places it remotely on a separate coating surface. This extraction allows the LED array and phosphor coating to be independently optimized and positioned, simplifying thermal management while maintaining the spectral transformation function.
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 remote phosphor system achieves predictable, high CRI white light with consistent color temperature, eliminating UV and IR emissions, and maintaining color consistency throughout the fixture's lifetime, while allowing for adjustable illumination and color simulation comparable to traditional light sources.
Implementation Method 1
The phosphor may be specially formulated to have certain characteristics... A remote phosphor light system which simulates a desired spectrum of light... using a phosphor device that is remote from the light source
Data Source
AI summary
A remote phosphor light which simulates the spectrum of a specified real world light, e.g. a tungsten or a daylight bulb.