Wide Angle LED Illumination Structure Using Segmented Chips
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Solution Overview
Problem
Light-emitting diodes (LEDs) used in illumination applications have limitations such as narrow band spectrum and directional emission, leading to uncomfortable and non-uniform illumination due to their narrow viewing angle, which is not suitable for indoor uses where a broader and more uniform light distribution is desired.
Innovation Solution
The proposed solution involves an illumination structure that includes a light-emitting diode (LED) device coupled to a circuit board and a substrate, with a lens and diffuser cap designed to redistribute the emitted light to a wide angle, utilizing multiple LED chips and phosphors to achieve broader spectrum and uniform illumination, and a heat sink for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a Lambertian based emitter and diffuser-based cap are used to distribute light, then light distribution is improved, but illumination angle is limited to 140 degrees with little backward light
Solution Approach 1:
The patent divides the single LED emitter into multiple LED chips arranged in a specific geometric pattern. This segmentation allows each chip to emit light in different directions, collectively achieving a wider illumination angle exceeding 140 degrees while maintaining uniform light distribution through the coordinated arrangement of multiple light sources.
Solution Approach 2:
The patent transitions from a two-dimensional diffuser-based approach to a three-dimensional spatial arrangement of multiple LED chips. By positioning LEDs at different heights and angles relative to the substrate, the system achieves omnidirectional light distribution in three-dimensional space, enabling backward light and wider coverage angles.
2Illumination intensity
If multiple LED chips with different wavelengths are integrated, then spectrum breadth is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple LED chips emitting different wavelengths (e.g., blue, green, red) into a single integrated illumination system. By merging these different wavelength sources and their corresponding phosphor materials into one unified structure, the system achieves broad spectrum coverage and effective white light generation while managing manufacturing complexity through integrated design.
Solution Approach 2:
The patent employs composite phosphor materials with different emission characteristics on the same substrate. By integrating multiple phosphor types that respond to different LED wavelengths, the system creates a composite luminescent material system that broadens the overall spectrum while maintaining a unified manufacturing process.
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 effectively redistributes LED light to a wide angle beyond 140 degrees, providing uniform illumination and reducing heat buildup, thus enhancing comfort and efficiency in indoor lighting applications.
Implementation Method 1
a lens and diffuser cap which are designed to redistribute emitting light from the LED device for wide angle illumination
Implementation Method 2
a heat sink for efficient heat dissipation
Implementation Method 3
utilizing multiple LED chips and phosphors to achieve broader spectrum and uniform illumination
Data Source
AI summary
The present disclosure provides one embodiment of an illumination structure. The illumination structure includes a light-emitting diode (LED) device on a substrate; a lens secured on the substrate and over the LED device; and a diffuser cap secured on the substrate and covering the lens, wherein the lens and diffuser cap are designed and configured to redistribute emitting light from the LED device for wide angle illumination.