Phosphor-Converted Superluminescent Diode for Tunable Low-Speckle Light
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Solution Overview
Problem
Existing light generating devices lack high intensity and tunable spectral power distribution, with superluminescent diodes offering limited bandwidth and speckle reduction compared to laser-based solutions.
Innovation Solution
A light generating system comprising a superluminescent diode and a luminescent material, controlled by a control system to achieve tunable spectral power distribution and reduced speckle, utilizing a luminescent material to convert light source light into luminescent material light with controllable spectral power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser-based solutions are used, then high intensity light is achieved, but speckle is increased
Solution Approach 1:
The patent changes the coherence parameter of the light source by using superluminescent diodes instead of lasers. The superluminescent diode emits light with low temporal coherence (broad spectral width) while maintaining high intensity, thereby reducing speckle formation while preserving illumination intensity.
2Object-generated harmful factors
If superluminescent diodes are used, then speckle is reduced, but bandwidth is limited
Solution Approach 1:
The patent segments the spectral output by using multiple superluminescent diodes with different central wavelengths (e.g., blue, cyan, green) instead of relying on a single broad-band source. Each diode contributes to a specific spectral region, and their combination provides comprehensive spectral coverage across the visible range while maintaining low coherence for speckle reduction.
3Adaptability or versatility
If conventional LEDs are used, then broad spectrum is achieved, but intensity is insufficient
Solution Approach 1:
The patent merges multiple superluminescent diodes with different spectral characteristics into a single integrated light source system. By combining the output of multiple SLEDs emitting at different wavelengths (blue, cyan, green), the system achieves both high intensity and broad spectral coverage, overcoming the limitations of single-LED approaches.
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 provides high intensity light with tunable spectral power distribution and reduced speckle, suitable for display and projector applications.
Implementation Method 1
a luminescent material configured to convert light source light into luminescent material light having one or more wavelengths in a luminescent material light wavelength range
Data Source
AI summary
The invention provides a light generating system (1000), configured to generate system light (1001), wherein the light generating system (1000) comprises a light source (10), a first luminescent material (210), and a control system (300), wherein: —the light source (10) is configured to generate light source light (11) having a tunable spectral power distribution within a first wavelength range (Λx1); wherein the light source (10) comprises a superluminescent diode; —the first luminescent material (210) is configured to convert at least part of the light source light (11) into first luminescent material light (211) having one or more wavelengths in a first luminescent material light wavelength range (Λm1); —the first luminescent material (210) is configured such that in an operational mode the system light (1001) comprises the first luminescent material light (211); —a spectral power distribution of the system light (1001) is controllable in dependence of the spectral power distribution of the light source light (11); and —the control system (300) is configured to control the spectral power distribution of the light source light (11).