Segmented Light Conversion Device for Laser Illumination
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Solution Overview
Problem
Existing lighting devices based on laser light sources face challenges in achieving high luminance with low laser power, maintaining stability over a wide temperature range, and minimizing crosstalk between channels, while also requiring precise control of luminous spots and color coordinates.
Innovation Solution
A light conversion device featuring a heat sink with a light conversion arrangement of separated light conversion elements, where each element is spaced by trenches and optionally connected by webs, allowing for efficient reflection operation and reduced thermal stress through the use of filling materials with matching thermal expansion coefficients, enabling high luminance and precise spatial variation of light spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If laser power is reduced to minimize energy consumption, then energy efficiency is improved, but luminance decreases
Solution Approach 1:
The light conversion element is divided into multiple spatially separated conversion regions (first, second, third regions) with different phosphor materials. This segmentation allows each region to be optimized for specific wavelength conversions, improving overall conversion efficiency and maintaining high luminance at lower laser powers by reducing energy losses.
Solution Approach 2:
Different phosphor materials are assigned to different spatial regions of the light conversion element. The first region contains phosphor for converting blue light to yellow, the second region contains phosphor for converting to red, and the third region contains phosphor for converting to green. This local optimization of conversion properties maximizes luminance output for each wavelength band, enabling high overall luminance efficiency.
2Illumination intensity
If multiple light conversion elements are used to achieve high luminance, then luminance is improved, but crosstalk between channels increases
Solution Approach 1:
The light conversion element is divided into multiple spatially separated conversion regions with trenches or gaps between them. This physical segmentation prevents optical crosstalk between different phosphor conversion regions, allowing each region to operate independently without interfering with adjacent regions, thus eliminating channel crosstalk while maintaining high luminance.
Solution Approach 2:
Trenches or gap structures are introduced between adjacent light conversion regions as intermediary barriers. These trenches act as optical isolators that prevent light from one conversion region from reaching adjacent regions, thereby eliminating crosstalk while allowing each region to contribute to the overall high luminance output.
3Illumination intensity
If light conversion elements are operated at high power to maintain luminance, then luminance is improved, but thermal stability deteriorates
Solution Approach 1:
The light conversion element is divided into multiple separate conversion regions with trenches between them. This segmentation improves thermal management by creating thermal isolation between regions, allowing heat to dissipate more efficiently from each individual region without causing thermal runaway, thus maintaining thermal stability at high power operation while preserving high luminance.
Solution Approach 2:
Different phosphor materials with optimized thermal properties are assigned to different spatial regions. Each region's phosphor is selected and positioned to optimize local thermal management, allowing the overall device to maintain thermal stability even when operating at high power levels required for high luminance output.
4Device complexity
If a single light conversion element is used to simplify the device, then device complexity is reduced, but precision of light spot control decreases
Solution Approach 1:
The light conversion element is divided into multiple spatially separated conversion regions that can be independently controlled. This segmentation enables precise control over which regions are activated and at what intensity, allowing for high-precision spatial control of light spots. Although the device structure becomes more complex, the segmentation is achieved within a single integrated element, minimizing overall device complexity while maximizing control precision.
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 achieves high luminance with low energy consumption, maintains stable lighting properties across a wide temperature range, and minimizes crosstalk between channels, particularly in applications like automotive and medical lighting, while allowing for precise spatial control of light spots.
Implementation Method 1
The light conversion element is able, after being irradiated with the light from the laser light source or the laser light sources, for example having a wavelength of 450 nm in the case of a blue laser, which is generally monochromatic, to convert said wavelength partially or completely into one or more other wavelengths or into a specific wavelength spectrum
Implementation Method 2
a main body, which is embodied in particular as a heat sink
Data Source
AI summary
A light conversion device is provided that includes a main body and a light conversion arrangement. The main body includes heatsink and is on a back side of the light conversion arrangement. The light conversion arrangement has a front side with light conversion elements separated from one another at least regionally by a trench. The light conversion elements, when irradiated with primary light on the front side, are configured to emit secondary light having a different wavelength from the front side.