Solid State Lighting Model for Color Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid state lighting systems face challenges in accurately reproducing colors due to variations in LED manufacturing, leading to inconsistent color rendering index (CRI) and unnatural object coloring, especially with limited red light spectrum in white LED backlights.
Innovation Solution
A method of controlling solid state lighting apparatuses by selecting predefined models based on user input and compensation signals to adjust lighting parameters, such as dimming and color temperature, using a Bézier surface model to maintain consistent color output across varying LED bins and manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If white LED backlighting with blue LED and yellow phosphor is used, then energy efficiency is improved, but color rendering quality deteriorates due to limited red light spectrum
Solution Approach 1:
The patent combines multiple LED types (blue LEDs with yellow phosphor, red LEDs, and green LEDs) into a single backlight system. This merging of different light sources with complementary spectral characteristics enables the system to maintain high energy efficiency while achieving superior color rendering by providing comprehensive spectral coverage including the red portion of the spectrum that is deficient in conventional white LED backlights.
Solution Approach 2:
The patent employs a composite lighting system that integrates different phosphor materials (yellow phosphor on blue LEDs) with separate red and green LED sources. This composite approach creates a multi-component light emission system that combines the energy-efficient phosphor-converted white light with additional spectral components from red and green LEDs, achieving both efficiency and accurate color rendering.
2Manufacturing precision
If LED binning and selection are used to improve color consistency, then manufacturing complexity increases
Solution Approach 1:
The patent utilizes red LEDs and green LEDs that can be selected from standard commercial bins with typical variations. By incorporating these additional LED types into the system architecture, the patent achieves color consistency across different LED bins without requiring custom-manufactured LEDs or complex binning procedures, as the system design inherently compensates for standard manufacturing variations.
3Manufacturing precision
If multiple LED types are combined to improve color rendering, then device complexity increases
Solution Approach 1:
The patent designs a backlight system where red LEDs and green LEDs serve multiple functions: they directly contribute to color rendering by providing essential spectral components, and they enable the system to achieve high CRI values without requiring complex additional components. This multi-functional approach integrates color improvement into the core backlight structure rather than adding separate corrective systems.
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 approach allows for consistent and natural color reproduction across different solid state lighting systems, accommodating user preferences and reducing variations caused by LED manufacturing inconsistencies, thereby enhancing the color rendering index and appearance of objects under the lighting.
Implementation Method 1
white LED lighting devices that include a blue-emitting LED coated with a wavelength conversion phosphor that converts some of the blue light emitted by the LED into yellow light
Implementation Method 2
a blue-emitting LED coated with a wavelength conversion phosphor that converts some of the blue light emitted by the LED into yellow light
Data Source
AI summary
A method of controlling a solid state lighting apparatus can be provided by receiving a solid state lighting characteristic selection signal at a solid state lighting apparatus and selecting, responsive to the solid state lighting characteristic selection signal, a solid state lighting model that defines a relationship between different lighting parameters used to vary light output from the solid state lighting apparatus responsive to a user input provided to the solid state lighting apparatus.