Laser Phosphor Light Source with Assistant Laser Dimming Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting systems face challenges in achieving linear dimming and maintaining high color rendering index (CRI) while minimizing the impact of quenching effects, which can lead to non-linear optical output and color point shifts.
Innovation Solution
A lighting system comprising a main light source with a luminescent material and an assistant laser light source, where the optical power of both components is controllable, allowing the control system to adjust the second component's power based on the first component's power to maintain a linear dimming range and consistent color point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical power of the main light source is increased to achieve higher brightness, then the luminous flux increases linearly, but saturation effects (thermally and/or optically induced) start to limit the conversion and cause non-linear behavior
Solution Approach 1:
The patent divides the light generation into two separate sources: a main light source (LED or laser diode) that provides the primary luminous flux, and an assistant light source (laser or LED) that provides supplementary light. This segmentation allows each source to operate within its linear range, preventing saturation effects from causing non-linear behavior in the combined output.
Solution Approach 2:
The patent changes the operational parameters by introducing a second light source with different characteristics (laser or LED with specific wavelength and spectral width). By adjusting the optical power of the assistant light source independently, the system maintains linear dimming behavior across a broader range, compensating for saturation effects in the main light source.
2Illumination intensity
If the optical power of the main light source is increased to achieve higher brightness, then the luminous flux increases, but quenching effects increase leading to color point shifts and reduced color rendering
Solution Approach 1:
The patent segments the spectral output by using two different light sources with distinct spectral characteristics. The main light source provides the primary spectrum, while the assistant light source fills in spectral gaps and compensates for quenching-induced color shifts, thereby maintaining high CRI even at high brightness levels.
Solution Approach 2:
The patent creates a composite light output by combining radiation from two different light sources (main light source and assistant light source). This composite approach allows the system to maintain a balanced spectral power distribution that preserves color rendering properties while achieving high overall brightness, effectively counteracting quenching effects.
3Device complexity
If a single light source is used to simplify the system, then the device complexity is reduced, but the ability to compensate for non-linearities and maintain consistent color point is limited
Solution Approach 1:
The patent implements control circuitry that independently controls the optical power of the assistant light source based on the operating conditions of the main light source. This feedback mechanism allows the system to compensate for non-linearities and maintain consistent color point by adjusting the assistant source's output in response to changes in the main source's performance.
Solution Approach 2:
The assistant light source serves multiple functions: it compensates for saturation effects, corrects quenching-induced color shifts, extends the linear dimming range, and maintains color point consistency. This multi-functionality justifies the additional component by providing comprehensive performance optimization that a single light source cannot achieve.
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 system enables a larger linear dimming range and high CRI by compensating for non-linearities with the assistant laser light source, ensuring consistent color rendering and reduced quenching impact.
Implementation Method 1
a luminescent material configured to convert at least part of the first pump light source light into luminescent material light
Implementation Method 2
a second light source comprising a laser light source configured to generate laser light source light
Data Source
Figure 1A~2
Figure 3~4
Figure 5A~6
AI summary
The invention provides a lighting system (1000) configured to generate lighting system light (1001), wherein the lighting system light (1001) comprises one or more of (i) a first lighting system light component (1101) having a first component optical power Wopt,comp1, and (ii) a second lighting system light component (1201) having a second component optical power Wopt,comp2; wherein the lighting system (1000) comprises: - a first light source (110) comprising a first pump light source (10) configured to generate first pump light source light (11) and a luminescent material (200) configured to convert at least part of the first pump light source light (11) into luminescent material light (201), wherein the first light source (110) optionally in combination with first optics (115) is configured to provide the first lighting system light component (1101), wherein the first lighting system light component (1101) comprises at least part of the luminescent material light (201), wherein the first lighting system light component (1101) has a first spectral power distribution with spectral intensity at a first wavelength λ1; - a second light source (120) comprising a laser light source (20) configured to generate laser light source light (21), wherein the second light source (120) optionally in combination with second optics (125) is configured to provide the second lighting system light component (1201), wherein the second lighting system light component (1201) comprises at least part of the laser light source light (21), wherein the second lighting system light component (1201) has a second spectral power distribution, different from the first spectral power distribution, with spectral intensity at a second wavelength λ2, wherein the second wavelength λ2 is selected from the range of λ1-30 nm≤ λ2≤ λ1+30 nm; - a control system (30) configured to control in one or more control modes the second component optical power Wopt,comp2 of the second lighting system light component (1201) in dependence of the first component optical power Wopt,comp1 of the first lighting system light component (1101).