Semiconductor Light Source Current Threshold Control
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Solution Overview
Problem
Semiconductor light sources face challenges in precisely controlling the color locus of emitted mixed radiation, particularly in avoiding undercurrent operations that lead to inaccurate control and reduced efficiency and color rendering quality.
Innovation Solution
A method involving a semiconductor light source with independent control of blue, bluish-white, greenish-white, and red light sources, operated in continuous wave mode with each source receiving at least 5% of the maximum current to prevent undercurrent operations, allowing for tunable correlated color temperature and high color rendering quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light sources are operated with low current to extend operating range, then adaptability is improved, but manufacturing precision deteriorates due to undercurrent operation causing inaccurate control
Solution Approach 1:
The patent changes the operating parameter range by establishing a minimum current threshold (5% of maximum current) for each light source. This parameter change ensures that all light sources operate within a current range where precise control is maintained, thereby resolving the contradiction between extending operating range and maintaining control precision.
2Use of energy by moving object
If light sources are operated with low current, then energy consumption is reduced, but manufacturing precision deteriorates due to reduced efficiency and color rendering quality
Solution Approach 1:
The patent establishes a minimum current operating threshold (5% of maximum current) that prevents operation in the inefficient undercurrent range. This parameter change ensures that light sources always operate within a range that maintains high efficiency and color rendering quality, thereby resolving the contradiction between energy consumption and color rendering quality.
3Device complexity
If continuous wave mode is used instead of pulse width modulation, then device complexity is reduced, but productivity deteriorates due to potential overheating concerns
Solution Approach 1:
The patent changes the operational parameters by setting minimum current thresholds and operating in continuous wave mode with carefully controlled current distribution across multiple light sources. This parameter change allows continuous wave operation without overheating by ensuring each light source operates within an optimal current range, thereby resolving the contradiction between device complexity and operating efficiency.
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 method achieves stable and reproducible color temperature control with high efficiency and color rendering quality by expanding the gamut limits while avoiding undefined current ranges, ensuring accurate control and minimal deviation from efficiency maxima.
Implementation Method 1
at least one first light source (21) that generates blue light; at least one second light source (22) that generates bluish-white light; at least one third light source (23) that generates greenish-white light; at least one fourth light source (24) that generates red light
Data Source
AI summary
A method of operating a semiconductor light source, wherein the semiconductor light source includes at least one first light source that generates blue light; at least one second light source that generates bluish-white light; at least one third light source that produces greenish-white light; at least one fourth light source that generates red light, wherein no further light sources are present, the light sources can be controlled independently of one another, the light sources are operated in a continuous wave mode and not by pulse width modulation, and the semiconductor light source is operated such that all in all white mixed light having a tunable correlated color temperature is generated, and each of the light sources is operated exclusively with at least 5% of an intended maximum current in the switched-on state of the semiconductor light source so that an undercurrent operation of the light sources is prevented.