LED Lamp with Red Chip Segmentation for High Color Rendering
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Solution Overview
Problem
Conventional white LED lamps have low color rendering at low color temperatures and require complex control circuits to adjust blue and red LED chip intensities, making them unsuitable for general illumination.
Innovation Solution
A white LED lamp design using at least one blue LED chip and multiple red LED chips, with a control circuit to adjust the intensity of the red light, producing a multicolor light by mixing blue, yellow, and red light, allowing for a wide range of color temperatures from 2500K to 7000K, and using YAG phosphor for improved efficacy and color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If red LED phosphor is added to enhance red light and increase color rendering index, then color rendering is improved, but luminous flux is reduced too much
Solution Approach 1:
The patent segments the light generation function into two independent parts: blue LED chips for high-efficacy white light generation (via YAG phosphor excitation) and red LED chips for color rendering enhancement. This segmentation allows each component to operate at its optimal efficiency without compromising the other, resolving the contradiction between maintaining luminous flux and improving color rendering index.
2Adaptability or versatility
If blue LED chip and red LED chip intensities are adjusted separately to achieve different color temperatures, then color temperature adjustment is improved, but control circuit complexity increases
Solution Approach 1:
The patent implements dynamic control of LED chip intensities through a control circuit that adjusts the driving currents of blue and red LED chips in real-time. This dynamic adjustment capability enables continuous variation of color temperature across a wide range (2500K-7000K) while maintaining a relatively simple control architecture, resolving the contradiction between adaptability and device complexity.
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 results in a white LED lamp with high efficacy and color rendering, suitable for general illumination, offering a simpler control circuit and longer service life compared to traditional fluorescent lamps, with color temperatures and luminous flux comparable to three-band fluorescent lamps.
Implementation Method 1
exciting the phosphor by the blue light emitted by the blue chip to produce yellow light
Implementation Method 2
the red light emitted by the red chip
Data Source
AI summary
A LED lamp and a manufacturing method thereof are disclosed. At least one blue LED chip can be used as an excitation light source. A number of red LED chips are arranged around the blue LED chip. The blue LED chip and red chips are covered with a packaging material with phosphor. The intensity of red light can be adjusted by a control circuit. Thus, the white LED lamps with high efficacy and high color rendering at different color temperatures can be achieved.