Wide Beam Angle LED Assembly with Perpendicular Flexible Circuit
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Solution Overview
Problem
General illumination LED lighting systems struggle to provide a wide beam radiation pattern and uniform color distribution, especially when compared to incandescent bulbs, as they typically exhibit a Lambertian radiation pattern and require complex optics for effective far-field color mixing.
Innovation Solution
The LED assembly features a baseplate with a circuit board and a diffuser, along with a flexible circuit with LEDs positioned perpendicular to the first set, connected in parallel, and controlled by a power and control module, which allows for adjustable color and improved light distribution by redirecting light through a reflective surface and optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional LED lighting systems are used, then energy efficiency is improved, but beam angle is limited to Lambertian pattern (160°)
Solution Approach 1:
The LED lighting system is divided into multiple independent LED modules arranged in a circular pattern, each module contributing to different angular segments of the beam. This segmentation allows the system to achieve a wider overall beam angle while maintaining LED energy efficiency, resolving the contradiction between traditional LED directional output and wide-angle illumination requirements.
Solution Approach 2:
The patent transitions from a single-plane LED arrangement to a three-dimensional circular array configuration with LEDs positioned at different radial distances from the center. This dimensional change enables light to be emitted in multiple angular directions simultaneously, achieving a wide beam angle (exceeding 160°) while maintaining the energy efficiency of LED technology.
2Adaptability or versatility
If multiple LEDs of differing colors are distributed over a large area, then color variety is improved, but far field color mixing becomes difficult
Solution Approach 1:
Multiple LEDs of different colors (red, green, blue, white) are merged into a single circular array structure where all LEDs contribute to a unified light output. The circular geometry and specific spacing ensure that light from all color variants mixes uniformly in the far field, achieving both color variety and color uniformity simultaneously.
Solution Approach 2:
Different regions of the circular LED array are assigned different color characteristics - inner LEDs may emit one color while outer LEDs emit another. This local differentiation of color properties across the circular structure enables effective far-field color mixing while maintaining overall color uniformity, as each local region contributes its specific color quality to the combined output.
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
This configuration enhances light uniformity and intensity, providing a wider beam angle and more uniform color distribution, similar to incandescent bulbs, while allowing for adjustable color temperature and reduced hotspots in ceiling-mounted applications.
Implementation Method 1
A ceiling or general illumination light emitting diode (LED) light assembly with a wide beam radiation pattern
Implementation Method 2
redirecting light through a reflective surface and optics
Data Source
AI summary
A LED assembly includes a baseplate and a diffuser. A circuit board connected to the baseplate has a first set of LEDs directed to emit light toward the diffuser. Additionally, a frame is attached to the baseplate and positioned to surround the circuit board. A flexible circuit with a second set of LEDs is attached to the frame, with the LEDs positioned to emit light predominantly perpendicular with respect to the first set of LEDs.