Multi-CCT Light Emission Control for Natural-Light Similarity
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Solution Overview
Problem
There is a demand for technologies that can implement white light similar to natural light using light-emitting devices, while also considering human visual sensitivity and providing a high-quality, reliable, and vivid color gamut.
Innovation Solution
A light emitting apparatus is developed, comprising at least one light emitting device, where natural light similarity is defined by a specific equation, and a controller adjusts the light intensity ratio of multiple light emitting devices with different correlated color temperatures to mimic natural light at various times of day.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light emitting devices with different correlated color temperatures are used to achieve natural light similarity, then the natural light similarity is improved, but the device complexity increases
Solution Approach 1:
The light emitting apparatus is divided into multiple independent light emitting devices, each emitting light with a different correlated color temperature. This segmentation allows the system to combine multiple spectral characteristics to achieve natural light similarity while maintaining modularity and manageable complexity in each individual device.
Solution Approach 2:
The control unit dynamically adjusts the operating states of multiple light emitting devices based on the desired natural light similarity requirements. By dynamically controlling which devices are active and their emission intensities, the system adapts to different lighting conditions while managing device complexity through intelligent control rather than permanent hardware complexity.
2Illumination intensity
If the root mean square of natural light similarity is reduced to less than or equal to 0.8, then the illumination quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The system achieves improved illumination quality by adjusting operational parameters (current, voltage, operating temperature) of light emitting devices rather than requiring extremely tight manufacturing tolerances. The control unit modifies these parameters dynamically to optimize the root mean square of natural light similarity to less than or equal to 0.8, thereby achieving high illumination quality while relaxing manufacturing precision requirements.
3Reliability
If light emitting devices are protected from external environment, then the reliability is improved, but the device structure complexity increases
Solution Approach 1:
The light emitting devices are protected using encapsulation layers and protective coatings that form thin film barriers against the external environment. These flexible protective structures shield the semiconductor components from moisture, oxygen, and mechanical stress, thereby improving reliability while adding minimal structural complexity compared to rigid protective housings.
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 apparatus effectively delivers illumination similar to natural light, with a root mean square of natural light similarity less than or equal to 0.8, achieving a high-quality and reliable lighting solution that enhances human visual experience.
Implementation Method 1
each of the light emitting devices may include a light emitting diode configured to generate light
Implementation Method 2
a wavelength converter covering a light exit surface of the light emitting diode
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A light emitting apparatus includes at least one light emitting device, wherein natural light similarity (S) of light emitted from the light emitting apparatus ranges from -2.5 to 1.