Solid State Light Source Arrangement for Color Mixing
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Solution Overview
Problem
Conventional solid state light source packages face limitations in maximum power and lumens due to phosphor heat trapped in silicone encapsulation and may not provide optimal color-mixing or tighter beam angles required for applications like spotlights.
Innovation Solution
The arrangement of solid state light source chips in non-rectangular or circular arrays on a substrate, with specific ratios and configurations of mint and amber color chips, along with a phosphor-converted blue-emitting chip, optimized for color-mixing and tighter beam angles, using a substrate with close chip spacing and advanced optics for improved light collimation and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solid state light sources are mounted on a substrate with phosphor conversion to produce white light, then white light is generated, but phosphor heat trapped in the silicone encapsulation limits maximum power and lumens
Solution Approach 1:
The patent extracts the phosphor from the silicone encapsulation environment and applies it directly to the solid state light source chips. This removes the heat-trapping silicone medium, allowing better thermal management and higher power operation while maintaining phosphor conversion efficiency for white light generation.
Solution Approach 2:
The patent applies different configurations of solid state light source chips with various phosphor conversions to different regions of the substrate. This allows optimization of local thermal and optical properties, enabling high power operation in specific areas while maintaining color quality across the entire light source array.
2Productivity
If solid state light sources are arranged in a rectangular grid to achieve high packing density, then high efficacy is provided, but the rectangular array may not provide the desired color-mixing when used with certain types of optics
Solution Approach 1:
The patent employs asymmetric arrangements of solid state light source chips on the substrate, deviating from traditional rectangular grids. This asymmetric positioning optimizes the spatial distribution of different wavelength emissions, enabling superior color-mixing performance while maintaining high packing density and efficacy.
3Quantity of substance
If solid state light sources are arranged in a rectangular array to allow close packing, then high density is achieved, but the arrangement may not provide the tighter beam angles desired for certain applications such as spot lights
Solution Approach 1:
The patent transitions from two-dimensional rectangular array arrangements to three-dimensional spatial configurations of solid state light source chips. This dimensional change enables optimization of both packing density and beam angle characteristics by utilizing vertical stacking and angular positioning to achieve tighter beam convergence for spotlight applications.
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
This configuration enhances color-mixing efficacy, achieves high correlated rendering index, high flux, and luminous efficacy, and provides a high-quality warm white light with a small beam angle, similar to halogen spotlights but with higher efficiency.
Implementation Method 1
The one or more solid state light sources, which typically emit light of a wavelength that produces a blue color, may be covered with a phosphor and/or a mixture of phosphors, either directly within the package or remotely, to provide phosphor conversion of the light emitted from the underlying one or more solid state light sources to produce white light
Data Source
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AI summary
Arrangements of solid state light sources for color-mixing, and light sources including the same, are provided. A substrate has and a plurality of different color LED chips (314, 316) coupled thereto. The emitted light is mixed to produce a white light output. The LED chips are arranged on the substrate in a manner that improves color-mixing, for example, by forming LED sets including one or more LED chips of different colors, by skewing the LED chips, and/or by forming a non-rectangular array or a circular array of LED sets and/or chips. The color-mixing LED arrangement may be used in a lamp or other light source together with collimating optics to collimate and further mix the color-mixed light output from the LED arrangement. The color-mixing LED arrangement may be provided as a single package with multiple LED chips or as multiple packages of one or more LED chips.