Multi-Color LED Array with Reflector for Brightness and Color Rendering
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Solution Overview
Problem
Conventional semiconductor light emitting devices face challenges in achieving high brightness and excellent color rendering properties, with devices using white LEDs formed by exciting a fluorescent substance with blue LEDs offering good brightness but poor color rendering, and RGB devices providing excellent color rendering but struggling with brightness due to individual light emission efficiency issues.
Innovation Solution
A semiconductor light emitting device is designed with four elements on a substrate emitting red, green, blue, and white light, each covered with resin and surrounded by a reflector, optimizing light emission and color mixing by adjusting the position and configuration of the elements and using a two-stage or three-stage substrate structure to enhance brightness and color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a device uses white LEDs formed by exciting a fluorescent substance with blue LEDs, then brightness is improved, but color rendering properties deteriorate
Solution Approach 1:
The patent combines multiple LED types (white LED with fluorescent substance, blue LED, green LED, red LED) into a single device to achieve both high brightness and excellent color rendering properties. The white LED provides high brightness through fluorescent conversion, while the additional colored LEDs supplement the spectrum to improve color rendering, particularly in the red region where fluorescent-based white LEDs are deficient.
2Reliability
If a device uses RGB LEDs emitting three primary colors, then color rendering properties are improved, but brightness deteriorates
Solution Approach 1:
The patent merges an RGB LED configuration with a white LED to achieve both excellent color rendering and high brightness. The white LED serves as the primary light source providing high brightness through efficient fluorescent conversion, while the RGB LEDs are added to supplement the spectrum and improve color rendering properties, particularly enhancing the red component that is weak in fluorescent-based white LEDs.
3Reliability
If multiple LED elements are arranged on a substrate, then color rendering is improved, but device complexity increases
Solution Approach 1:
The patent segments the lighting function into multiple independent LED elements (white LED, blue LED, green LED, red LED) that can be independently controlled and optimized. Each LED type targets specific spectral regions, allowing precise control over the emitted spectrum to achieve excellent color rendering while maintaining manageable structural complexity through modular arrangement on a substrate.
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 provides a semiconductor light emitting device with high brightness and excellent color rendering properties, improving light emission efficiency and color mixing, particularly when seen directly or at a position other than the irradiated surface, while allowing for a smaller product size and simplified manufacturing.
Implementation Method 1
a device having one or a plurality of LEDs emitting light in a single color such as red, blue, or yellow, or emitting white light generated by exciting a blue LED with a fluorescent substance
Data Source
AI summary
A semiconductor light emitting device of the present invention includes four elements provided on a substrate and having different light emitting colors of red, green, blue, and white, respectively; a resin covering each of the elements; and a reflector provided to surround a circumference of the resin. With this structure, a semiconductor light emitting device having high brightness and excellent color rendering properties can be provided.