Multi-Chip LED Color Rendition via Segmented Wavelengths
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Solution Overview
Problem
Conventional light emitting devices suffer from color rendition issues due to limited wavelength range, making it difficult to achieve high color rendition that meets consumer requirements, especially when using a combination of yellow phosphors and blue light emitting chips.
Innovation Solution
A light emitting device comprising first and second red light emitting diode chips with different wavelength ranges and third blue light emitting diode chips with a wider full width at half maximum (FWHM) to improve color rendition, achieving a light output similar to solar light by utilizing a substrate with multiple light emitting diode chips arranged symmetrically and connected via conductive patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a typical light emitting device uses a combination of yellow phosphors and a blue light emitting chip to generate white light, then the device achieves high brightness, but the color rendition deteriorates due to limited wavelength range
Solution Approach 1:
The patent segments the light emitting device into multiple independent LED chips, each emitting light in different wavelength ranges (violet 405nm, blue 450nm, cyan 495nm, green 530nm, yellow-green 560nm, red 630nm). This segmentation allows each chip to contribute specifically to different portions of the spectrum, achieving both high brightness and excellent color rendition by combining the outputs of these segmented light sources.
2Manufacturing precision
If a red light emitting diode is added to improve color rendition, then the color rendition varies according to arrangement, but it becomes difficult to obtain consistent high color rendition that satisfies consumer requirements
Solution Approach 1:
The patent employs a universal design where multiple LED chips of different types (violet, blue, cyan, green, yellow-green, red) are integrated into a single light emitting device. Each chip type serves multiple functions: contributing to overall brightness, providing specific wavelength coverage for color rendition, and working synergistically with other chips. This multi-functional approach ensures consistent high color rendition regardless of specific arrangement variations.
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 enhances color rendition by emitting light across multiple red and blue wavelength ranges, resulting in a light output that closely resembles solar light, thereby addressing the limitations of conventional devices.
Implementation Method 1
General light emitting devices generate light through recombination of electrons and holes in an area between an n-type semiconductor layer and a p-type semiconductor layer
Implementation Method 2
utilizing a quantum well structure with varying well layer thicknesses to achieve a wide full width at half maximum, thereby enhancing color rendition
Data Source
AI summary
A light emitting device includes a first light emitting diode chip comprising a red wavelength, a second light emitting diode chip comprising a different red wavelength from the wavelength of the first light emitting diode chip, and a plurality of third light emitting diode chips disposed around the first and second light emitting diode chips. The light emitting device emits light in a wavelength region similar to that of solar light, thereby improving color rendition.