LED Array with Reflectors for Spherical Emission
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Solution Overview
Problem
Solid state light sources, such as LEDs, typically have a lambertian emission pattern that limits their use as replacements for conventional incandescent, halogen, and fluorescent lamps, resulting in undesired dark spots, particularly in downward directions in common lighting applications.
Innovation Solution
A light source comprising a substrate with a planar arrangement of solid state light emitting cells and one or more reflectors arranged to emit light with a substantially spherical emission pattern, mimicking the emission pattern of conventional lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a typical LED with lambertian emission pattern is used, then light conversion efficiency is improved, but emission pattern uniformity deteriorates
Solution Approach 1:
The invention divides the single LED light source into multiple discrete LED elements arranged in an array. Each LED element maintains its efficient lambertian emission pattern, while the collective arrangement with strategic positioning and individual control enables uniform spherical emission pattern across the entire light source, resolving the contradiction between individual efficiency and collective uniformity
Solution Approach 2:
The invention applies local quality by allowing different LED elements in the array to have different emission characteristics tailored to specific spatial requirements. LEDs positioned at different locations can be controlled to emit light in different directions and intensities, creating uniform overall emission while maintaining high efficiency at each local element
2Device complexity
If LED light source with lambertian emission pattern is used, then device complexity is reduced, but lighting application versatility deteriorates
Solution Approach 1:
The invention introduces dynamic control capability where each LED element in the array can be independently controlled in terms of intensity and timing. This dynamic control allows the same LED array structure to adapt to different lighting applications and requirements, enabling versatility while maintaining relatively simple device architecture
Solution Approach 2:
The LED array structure with spherical emission pattern provides multi-functionality by being able to replace various conventional light sources (incandescent, halogen, fluorescent) in different applications. The uniform emission pattern in all directions makes it universally applicable to desk lamps, floor lamps, table lamps, and other lighting fixtures
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 enables a more uniform light distribution, allowing solid state light sources to effectively replace conventional lamps in various applications by directing light in all directions, including downwards, thus eliminating dark spots and enhancing usability in tasks like reading and working.
Implementation Method 1
one or more reflectors arranged with the solid state light emitting cells so that light emitted from the light source has a substantially spherical emission pattern
Data Source
AI summary
A light emitting apparatus includes a substrate, a plurality of solid state light emitting cells having a planar arrangement on the substrate, and one or more reflectors arranged with the solid state light emitting cells so that light emitted from the light source has a substantially spherical emission pattern.