High-Intensity White Light Source with Angular Beam Mixing
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Solution Overview
Problem
Existing high-power LED and laser-based light sources suffer from color inhomogeneity (color-over-angle effect) and heat management issues, particularly in phosphor-based lighting devices, which prior solutions are complex, sensitive to production variations, and do not address degradation of phosphor or scattering particles.
Innovation Solution
A light generating system comprising multiple light generating devices with different angles of incidence to a luminescent body, which converts and transmits light, controlling intensity based on angles to achieve homogeneous color distribution and improved heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single high-power LED or laser source is used to achieve high brightness, then intensity is improved, but color inhomogeneity (color-over-angle effect) worsens
Solution Approach 1:
The invention divides a single high-power light source into multiple lower-power light generating devices (e.g., multiple LED chips or laser diodes). Each device is directed at the luminescent body from a different angle, which segments the light path and reduces the color-over-angle effect while maintaining high overall brightness through combined output.
Solution Approach 2:
Different light generating devices are positioned to illuminate different regions of the luminescent body with optimized local angles of incidence. This creates locally optimized color uniformity across the entire light output, with each region contributing to overall homogeneous color distribution.
2Productivity
If phosphor containing material extends above the cup rim to increase converted light, then light output is improved, but color variation at high viewing angles worsens
Solution Approach 1:
Instead of increasing phosphor height in the vertical dimension (which worsens color variation), the invention addresses light output by adding spatial distribution in the angular dimension - using multiple light sources positioned at different angles to illuminate the luminescent body, thereby increasing total light output without compromising color consistency.
3Stability of the object's composition
If multiple light generating devices with different angles of incidence are used, then color uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple light generating devices are merged into a single integrated light generating system with a common luminescent body. This combining approach achieves color uniformity through angular diversity while maintaining a compact, unified structure that does not significantly increase overall system complexity.
Solution Approach 2:
The luminescent body serves multiple functions: it converts light from multiple angles, acts as a mixing element for homogeneous color distribution, and provides a compact integration point for multiple light generating devices. This multi-functionality reduces the need for additional components, thereby limiting complexity increase.
4Illumination intensity
If high power density is used to achieve high brightness, then intensity is improved, but heat management becomes more difficult
Solution Approach 1:
The total optical power is segmented across multiple light generating devices, which distributes the heat generation across multiple separate heat sources rather than one concentrated source. This makes thermal management easier as heat can be dissipated from multiple locations, reducing peak temperatures and improving overall heat management.
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 reduces color-over-angle problems and achieves more uniform light distribution with controlled intensity, maintaining high brightness and thermal stability, especially in applications like projection and automotive lighting.
Implementation Method 1
the luminescent body is configured to convert part of the first device light into luminescent material light
Implementation Method 2
the luminescent body is configured to transmit part of the first device light
Implementation Method 3
a first plurality of scattering particles to scatter a first target wavelength and a second plurality of scattering particles to scatter a second target wavelength
Data Source
AI summary
The invention provides a light generating system (1000) comprising: (i) a first set (1100) comprising n1 first light generating devices (110), (ii) a first optical element (410), and (iii) a luminescent body (200), wherein: —the n1 first light generating devices (110) are configured to generate first device light (111); wherein the n1 first light generating devices (110) may be selected from the group of lasers and superluminescent diodes; —the first set (1100) comprises k1 first subsets (1115) of each at least one first light generating device (110) of the n1 first light generating devices (110), wherein n1≥3, especially n1≥5, and 2≤k1≤n1; —the luminescent body (200) is configured to: (i) convert part of the first device light (111) into luminescent material light (211), and (ii) transmit part of the first device light (111); —the n1 first light generating devices (110) and the first optical element (410) are configured to provide first beams (115) of first device light (111) to the luminescent body (200), wherein two or more first beams (115) of two or more first light generating devices (110) of the k1 first subsets (1115) have different first angles of incidence (α1) relative to a normal to the luminescent body (200); and—in an operational mode of the light generating system (1000) a first intensity of the first device light (111) of the k1 first subsets (1115) is dependent upon the first angles of incidence (α1).