Solid State Lighting Module Lumen Output and Color Point Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor light emitting devices, particularly those using phosphor-based solid state lighting components, often have a low color rendering index (CRI), leading to unnatural object coloring due to limited light spectrum, and struggle to balance color point, CRI, and lumen output in lighting modules.
Innovation Solution
A lighting module comprising a plurality of solid state light emitting components configured to provide collective light emission with a desired color point and CRI, supplemented by an additional light emitting component that emits light over a different wavelength range to increase lumen output without altering the desired white point, using a combination of blue shifted yellow, red, warm-white, or neutral-white LEDs and wavelength conversion materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphor-based solid state lighting components are used to generate white light, then energy efficiency is improved, but color rendering index deteriorates
Solution Approach 1:
The patent combines multiple solid state light emitting components with different emission characteristics (blue LED with yellow phosphor, red LED, green LED) to create a composite light source that achieves both high energy efficiency and high CRI (>90) by merging their spectral outputs
2Reliability
If multiple wavelength conversion materials are used to improve CRI, then color rendering index is improved, but device complexity increases
Solution Approach 1:
The patent segments the lighting system into multiple independent solid state light emitting components, each responsible for specific wavelength ranges, allowing simplified individual component design while achieving complex spectral output collectively
3Reliability
If red-emitting elements are added to improve CRI, then color rendering index is improved, but maintaining color point becomes difficult
Solution Approach 1:
The patent applies local quality by assigning specific functional roles to different components: blue LED with yellow phosphor provides base white light, red LED specifically enhances CRI in the red spectrum, and green LED fills the green spectrum gap, with each component optimized for its local spectral region while contributing to overall color point stability
4Productivity
If lumen output is increased by adding more light emitting components, then luminous flux is improved, but color point stability deteriorates
Solution Approach 1:
The patent uses parameter changes by adjusting the relative intensities and spectral characteristics of each light emitting component to achieve desired color points while maximizing total luminous flux output
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 a CRI greater than 90 and increased luminous flux while maintaining the desired color point, approximating the performance of incandescent lamps in object illumination.
Implementation Method 1
Light emitting diodes and laser diodes are well known solid state lighting elements capable of generating light upon application of a sufficient current
Implementation Method 2
The radiative recombination of electrons and holes within the active region generates light
Implementation Method 3
The light from a single-color LED may be converted to white light by surrounding the LED with a wavelength conversion material, such as a phosphor
Implementation Method 4
A fraction of the light may also pass through the phosphor and/or be reemitted from the phosphor at essentially the same wavelength as the incident light
Data Source
Figure 1~2
Figure 3A~3C
Figure 4A~5A
AI summary
A lighting module includes a plurality of solid state light emitting components configured to collectively emit light having a desired white point and a color rendering index (CRI) of greater than about 90. The module further includes at least one additional solid state light emitting component configured to individually emit light having a white point substantially similar to the desired white point. The at least one additional light emitting component may increase a lumen output of the lighting module without substantially altering the desired white point of the light collectively emitted by the plurality of light emitting components.