Light Emitting Assembly Two-Channel Color Tuning
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Solution Overview
Problem
Conventional light emitting assemblies that are tunable in color temperature are either complex and costly due to requiring three independent control channels or fail to produce white light effectively when using only two control channels, resulting in mixed light colors that are not perceptively white.
Innovation Solution
A light emitting assembly with three light emitting components and a control device using only two control channels, where the components are driven jointly in different operating ranges to continuously adjust the mixed light from warm white to cold white, approximating the Planckian locus for a white color perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three independent control channels are used to drive three light emitting components, then the color temperature tunability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the control of two light emitting components (second and third components) into a single control channel. The control device drives the second and third light emitting components jointly via one control channel, while the first component is driven via a separate first control channel. This merging reduces the total number of control channels from three to two, thereby reducing device complexity and manufacturing cost while maintaining the ability to continuously adjust color temperature from warm white to cold white.
2Device complexity
If only two control channels are used to drive three light emitting components, then the device complexity is reduced, but the white light perception quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning different driving modes to different components based on their spectral characteristics. The first light emitting component (with different spectral properties) is driven independently via the first control channel, while the second and third components are driven jointly via the second control channel. This differentiated control strategy ensures that each component contributes optimally to producing white light that is perceived as such, even with reduced control channel quantity.
Solution Approach 2:
The control device dynamically adjusts the driving parameters of the light emitting components based on the operating range. In a first operating range, the first component is driven via the first channel and the second and third components are driven jointly via the second channel. In a second operating range, the second component is driven via the second channel and the first and third components are driven jointly via the first channel. This dynamic switching maintains white light perception quality across different color temperature settings.
3Device complexity
If two light sources emitting different colors are mixed, then the device complexity is reduced, but the mixed light color deviates from white light perception
Solution Approach 1:
The patent utilizes parameter changes by selecting light emitting components with specific spectral parameters and adjusting their driving parameters dynamically. The first, second, and third light emitting components have different spectral characteristics, and the control device adjusts their individual and joint driving parameters to achieve mixed light that is perceived as white. This parameter optimization ensures that even with only two control channels, the mixed light color accuracy meets white light perception requirements.
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 allows for simple and cost-effective production of light whose color is continuously tunable between warm white and cold white, ensuring the mixed light is perceived as white or approximately white, with a linear approximation to the Planckian locus, thereby improving color temperature tunability and perception.
Implementation Method 1
A light emitting assembly includes a first light emitting component, which emits light of a first color; a second light emitting component, which emits light of a second color, which is different than the first color; at least one third light emitting component, which emits light of a third color, which is different than the first color and the second color
Implementation Method 2
wherein the light emitting components are arranged such that the first light, the second light and the third light mix to form a mixed light
Data Source
AI summary
A light emitting assembly includes a first light emitting component, a second light emitting component, and a third light emitting component. The components are arranged such that a first light, a second light and a third light mix to form a mixed light. The assembly includes a control device, which has a first control channel and a second control channel operating the three components and configured such that in a first operating range the first component is driven via the first channel and the second and third components are driven jointly via the second channel. In the first operating range the mixed light is continuously adjustable from the first color to a fourth color, and in a second operating range the second component is driven via the second channel and the first and third components are driven jointly via the first channel.