Tunable White LED Array Layout for Adjustable CCT Lighting
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Solution Overview
Problem
Conventional LED strip lighting devices are limited to emitting light with a single, fixed set of characteristics, such as color correlated temperature (CCT) values, which cannot be adjusted to match varying circadian rhythms or lighting demands in commercial settings.
Innovation Solution
A lighting device with an LED array comprising multiple LEDs that can be individually controlled to generate light at different CCT values within a range, using a combination of narrow and broad spectrum LEDs and an elastomer to adjust light characteristics, allowing for tunable CCT values and light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single LED type is used in the LED array, then the device structure is simple, but the CCT value cannot be adjusted to match varying lighting demands
Solution Approach 1:
The LED array is segmented into multiple types of LEDs with different spectral characteristics (narrow spectrum LEDs at 450nm, 530nm, 630nm wavelengths and broad spectrum white LEDs). This segmentation allows independent control of each LED type to achieve tunable CCT values while maintaining a manageable structure through modular organization on the circuit board.
Solution Approach 2:
The LED array is designed with multi-functionality by incorporating both narrow spectrum LEDs (for precise color control) and broad spectrum white LEDs (for overall illumination). This universal design enables the same LED array structure to produce a wide range of CCT values (2000K-10000K) and maintain high color rendering index (CRI>80), making it adaptable to various lighting scenarios.
2Adaptability or versatility
If multiple LED types are combined to achieve tunable CCT, then CCT adjustability is improved, but the device complexity increases
Solution Approach 1:
The control system implements dynamic adjustment of CCT values by independently controlling the intensity of each LED type in the array. The controller can dynamically modify the output characteristics based on circadian rhythm requirements, time of day, or user preferences, enabling the lighting system to adapt to varying lighting demands throughout the day while managing complexity through programmable control.
3Measurement precision
If narrow spectrum LEDs are used, then color precision is improved, but the spectrum breadth is limited
Solution Approach 1:
The patent merges narrow spectrum LEDs (providing precise color control at specific wavelengths) with broad spectrum white LEDs (providing comprehensive spectral coverage). This combination allows the system to achieve both color precision (through controlled emission at 450nm, 530nm, 630nm) and spectrum breadth (through the white LED component), resulting in tunable white light with high CRI (>80) across a wide CCT range (2000K-10000K).
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
Enables the emission of white light with adjustable CCT values between 3000 and 6500 degrees Kelvin, accommodating various lighting needs and improving user experience by simulating natural light cycles.
Implementation Method 1
The yellow phosphor coating converts a portion of the blue light from the LED into yellow light
Implementation Method 2
the at least one material is configured to change at least one characteristic of the light emitted by the second LED
Implementation Method 3
the at least one material comprises a material selected from the group consisting of: a pigment, a photo-luminescent material, and scattering particles
Data Source
AI summary
According to at least one aspect, a lighting device is provided. The lighting device comprises a circuit board; a light emitting diode (LED) array mounted to the circuit board and configured to emit broad spectrum light at any one of a plurality of different color correlated temperature (CCT) values within a range of CCT values, the LED array comprising a first LED configured to emit narrow spectrum light and a second LED that is different from the first LED and configured to emit broad spectrum light; and at least one elastomer encapsulating at least part of the circuit board and the LED array mounted to the circuit board.