Multi-Color LED Light Bulb for Simultaneous Brightness and Color Temperature Control
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Solution Overview
Problem
Conventional light emitting devices using LEDs struggle to simultaneously control brightness and color temperature, failing to replicate the nuanced light control and toning characteristics of incandescent bulbs, which are psychologically influential through varying color temperatures and illuminance.
Innovation Solution
A light emitting device comprising at least two white light sources with different color temperatures, where the color temperature of the mixed white light is adjusted by controlling the drive currents of LED chips and phosphor compounding ratios, allowing for arbitrary intermediate color temperatures and brightness control, achieving a natural white light with high color rendering index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional LED light bulb uses a single white light source with fixed color temperature, then the structure is simple and manufacturing is easy, but the ability to control both brightness and color temperature simultaneously is lost
Solution Approach 1:
The patent segments the white light source into multiple LED chips with different color temperatures (e.g., warm white 2000K, neutral white 4000K, cool white 6000K). Each LED chip group can be independently controlled, allowing simultaneous adjustment of brightness and color temperature by mixing different proportions of these segmented light sources.
Solution Approach 2:
The patent makes a single LED light bulb capable of multiple functions by integrating multiple LED chips with different color temperatures into one device. This universal design allows the bulb to provide both illumination and color temperature adjustment, replicating the toning capability of incandescent bulbs while maintaining energy efficiency.
2Illumination intensity
If brightness is adjusted by controlling LED current in conventional white light sources, then brightness control is achieved, but color temperature remains unchanged
Solution Approach 1:
The patent implements dynamic control where the system can adjust not only the intensity of each LED chip group but also the color temperature by changing the mixing ratio of different color temperature LEDs. This dynamic capability allows simultaneous control of both brightness and color temperature, replicating the natural toning effect of incandescent bulbs.
Solution Approach 2:
The patent changes the parameters of the light source by using multiple LED chips with different color temperatures instead of a single fixed color temperature LED. By varying the drive current ratios of these different LED chips, the system can dynamically change both the overall brightness and the perceived color temperature of the emitted light.
3Adaptability or versatility
If multiple LED chips with different color temperatures are used to achieve color temperature adjustment, then toning capability is improved, but control coordination between brightness and color temperature becomes complex
Solution Approach 1:
The patent incorporates control circuits that can coordinate the drive currents to multiple LED chip groups. By implementing feedback control mechanisms, the system automatically adjusts the current ratios to maintain the desired color temperature while achieving the target brightness level, simplifying user operation.
Solution Approach 2:
The patent uses a control circuit as an intermediary between the user input and the multiple LED chips. This intermediary component handles the complex coordination of current distribution to multiple LEDs, translating simple user commands into coordinated adjustments of brightness and color temperature without requiring manual control of each LED group.
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 device achieves flexible control over color temperature and brightness, producing a wide range of white lights with improved color rendering, mimicking natural light and enabling both light control and toning functions, similar to incandescent bulbs.
Implementation Method 1
at least a first light source which emits a first white light having a first color temperature and a second light source which emits a second white light having a second color temperature higher than the first color temperature
Implementation Method 2
it has been difficult to change the brightness according to a change of the color temperature of the white light
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A light emitting device and an LED light bulb using white LED light sources have light control and toning functions equivalent to those of an incandescent light bulb. The light emitting device includes a first light source which emits a first white light having a first color temperature and a second light source which emits a second white light having a second color temperature higher than the first color temperature, and emits a mixed white light of the first white light and the second white light. A color temperature of the mixed white light of the first white light and the second white light is lower as an emission intensity of the mixed white light is lower.