Independently Addressable LED Sections for White Light Color Balance
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Solution Overview
Problem
Conventional light-emitting diodes (LEDs) struggle to produce white light with high color rendering index, luminous efficacy, and appropriate color temperature suitable for general lighting applications, as they often result in yellow-white light that is not color balanced.
Innovation Solution
The development of a light-emitting device with independently addressable light-emitting sections, each incorporating a wavelength converting material layer, allowing for separate current control to achieve desired color balance and luminous efficacy, combining light from multiple sections to produce white light with improved color rendering and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single LED with wavelength converting material is used, then the device structure is simple, but the color rendering index and color temperature cannot be optimized for general lighting applications
Solution Approach 1:
The LED device is divided into multiple independently addressable light-emitting sections (first section, second section, etc.), each with separate electrical contacts. This segmentation allows different sections to emit light at different wavelengths and intensities, enabling precise control over the spectral composition of the combined white light output, thereby achieving high color rendering index and optimized color temperature.
Solution Approach 2:
Different light-emitting sections are assigned different local characteristics through independent current control. Each section can be tuned to emit specific wavelengths with optimized intensity, allowing the overall device to produce spectrally balanced white light with enhanced color rendering properties tailored for general lighting applications.
2Manufacturing precision
If multiple wavelength converting materials are used in a single LED, then the color rendering improves, but the electrical control and current distribution become complex
Solution Approach 1:
The device segments the light-emitting structure into multiple independently electrically addressable sections, each with its own electrical contacts. This segmentation simplifies the electrical control architecture by allowing independent current driving of each section, avoiding the need for complex current distribution networks that would be required if multiple wavelength converting materials were placed in a single monolithic LED structure.
Solution Approach 2:
The device enables dynamic and independent control of current through each light-emitting section. This dynamic control capability allows flexible adjustment of the intensity and spectral composition of light from each section, simplifying the electrical control scheme while achieving superior color rendering performance through programmable light output management.
3Use of energy by moving object
If conventional LED white light generation is used, then the power efficiency is high, but the luminous efficacy and color balance are insufficient for general lighting
Solution Approach 1:
The LED device is segmented into multiple independently controllable light-emitting sections that can be driven with optimized current levels. This segmentation enables precise control over the contribution of each section to the overall light output, allowing optimization of luminous efficacy by tuning the intensity of each section to maximize the weighted sum of luminous flux while maintaining high power efficiency through efficient current utilization in each section.
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 production of white light with enhanced color rendering index and luminous efficacy by independently controlling the light emission from multiple sections, allowing for tailored color balance and improved lighting performance across various applications.
Implementation Method 1
At least one of the light-emitting sections including a wavelength converting material layer through which light passes
Data Source
AI summary
Light-emitting devices are described herein. Some embodiments relate to light-emitting diodes with light-emitting sections that are independently electrically addressable. The devices may be used in a variety of applications including illumination and general lighting.