Pump Laser Matrix for Controllable Phosphor Irradiation
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Solution Overview
Problem
Current lighting technologies, such as those using gas discharge lamps, lack effective color control in applications like projection and endoscopy, where high luminance is required, and existing LARP technologies rely on fixed pump radiation sources.
Innovation Solution
A lighting device comprising a pump laser matrix and a phosphor arrangement with controllable pump radiation power distribution, allowing for separate irradiation of multiple phosphors to generate differently wavelength-converted light, enabling precise control of the color locus of the mixed light through targeted control of individual pump lasers or laser groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pump radiation source is used in LARP technology, then the device structure is simple, but color control capability is lost
Solution Approach 1:
The single pump radiation source is segmented into multiple independently controllable pump lasers arranged in a matrix. Each laser can be individually controlled to irradiate specific phosphor regions, enabling color control by selectively activating different phosphors (yellow, red, green) through spatial and temporal segmentation of the pump radiation.
Solution Approach 2:
The pump radiation system transitions from a fixed source to a dynamic pump laser matrix where individual lasers can be switched on and off independently. This dynamic control allows real-time adjustment of which phosphors are irradiated, enabling color locus control of the mixed light output.
2Adaptability or versatility
If multiple phosphors are irradiated simultaneously, then color control is achieved, but pump radiation power distribution control becomes critical
Solution Approach 1:
The pump radiation is divided into multiple independent laser elements that can be controlled separately. This segmentation allows precise control of power distribution to different phosphor regions by individually adjusting each laser's output, ensuring accurate color locus control through targeted irradiation.
Solution Approach 2:
Different regions of the phosphor arrangement are irradiated by specific lasers with controlled power levels. The local quality of irradiation is optimized by matching individual laser power output to the specific phosphor regions they irradiate, allowing precise control of the contribution of each phosphor to the overall mixed light color.
3Illumination intensity
If high pump radiation power is used, then luminance output increases, but laser lifespan decreases due to excessive power
Solution Approach 1:
The total pump radiation power is distributed across multiple laser elements rather than concentrated in a single laser. This segmentation allows the system to achieve high overall luminance output while keeping individual laser power levels within safe operating ranges, thereby extending laser lifespan.
Solution Approach 2:
Instead of using a single laser at high power, the system uses multiple lasers operating at moderate power levels. This partial action approach achieves the desired total luminance output while avoiding excessive power concentration that would reduce laser lifespan.
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 solution allows for flexible control of the color locus of the mixed light, enabling targeted changes or constant regulation, extending the lifespan of the lighting device by operating within safe power ranges for the lasers and efficiently mixing wavelength-converted light to produce desired color outputs.
Implementation Method 1
a phosphor is irradiated by a laser. The laser radiation that impinges on the phosphor, also designated hereinafter as pump radiation, is partly converted into wavelength-converted useful light by means of wavelength conversion by the phosphor
Data Source
AI summary
A lighting device comprising a pump laser matrix (2) and a phosphor arrangement. The pump laser matrix (2) is configured to emit pump radiation (7) having a controllable pump radiation power distribution for the irradiation of the phosphor arrangement (4). The phosphor arrangement (4) comprises at least two different phosphors (R, Y, G) which can be irradiated with the pump radiation (7) and re-emit said pump radiation in a manner such that it is at least partly and in each case differently wavelength-converted. The lighting device (1) is configured to generate, with the aid of the pump laser matrix (2), a controllable distribution of the surface power density of the pump radiation on the phosphors (R, Y, G) of the phosphor arrangement (4).