Multi-junction LED Package Averaging Tap Flicker
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Solution Overview
Problem
Traditional AC-DC converters for powering LEDs are bulky and costly, leading to issues with flicker and brightness variations in LED modules driven by tapped linear drivers due to the differential switching of LEDs.
Innovation Solution
The use of multi-pad, multi-junction LED packages configured to average out the flicker and brightness characteristics of different LED taps, where each package includes LEDs from various taps, ensuring consistent lighting quality by grouping LEDs into packages that act as point sources with averaged light emitting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional AC-DC converters are used to power LEDs, then reliable AC-to-DC conversion is achieved, but the device becomes bulky and costly
Solution Approach 1:
The patent extracts the LED packages from a single continuous string and creates multiple independent strings with tap points. This allows the AC-DC converter to be replaced by a simpler tapped linear driver circuit that can be integrated directly into the LED module, eliminating the need for bulky external AC-DC converters while maintaining reliable power conversion through the linear driver architecture
Solution Approach 2:
The LED array is segmented into multiple strings with tap points along each string. This segmentation enables the use of a tapped linear driver that can selectively power different portions of the LED array based on instantaneous AC voltage levels, replacing the need for a complete AC-DC converter while achieving reliable AC-powered operation
2Use of energy by moving object
If LEDs are differentially switched in tapped linear driver configurations, then power efficiency is improved, but flicker and brightness variations occur
Solution Approach 1:
The patent combines multiple LEDs from different tap points into single multi-junction packages. Each package contains LEDs that would otherwise be switched at different times, causing flicker. By merging them into one physical package with multiple electrical junctions, the flicker and brightness variations are averaged out while maintaining the power efficiency benefits of differential switching
Solution Approach 2:
The patent creates local quality variations within each LED package by including LEDs from different tap points with different forward voltages. This allows the package to respond differently to voltage variations at different tap points, averaging out the brightness variations and flicker that would occur with differential switching while maintaining overall power efficiency
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 reduces flicker and brightness variations along the LED module, providing a more uniform lighting experience by averaging out the light emitting characteristics of different taps, thus improving the overall lighting quality.
Implementation Method 1
A multi-pad, multi-junction light emitting diode (LED) package is disclosed
Data Source
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AI summary
A light emitting diode ("LED") module is disclosed. The LED module includes a first LED tap and a second LED tap, the first tap being powered on for a longer amount of time than the second LED tap, based on an alternating current voltage. The LED module also includes a first LED package on which a first LED associated with the first LED tap and a second LED associated with the second LED tap are disposed. The LED module further includes a second LED package on which a third LED associated with the first LED tap and a fourth LED associated with the second LED tap are disposed.