LED Luminaire Phase Modulation for Imperceptible Flicker
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Solution Overview
Problem
Conventional LED luminaires pose health risks due to flicker-induced issues such as seizures, headaches, and visual discomfort, and existing solutions do not adequately address these concerns while ensuring energy efficiency and color rendering requirements.
Innovation Solution
An LED luminaire with a phase-amplitude circuit that modulates LED driving currents at different frequencies, using a control device to generate imperceptible flicker frequencies to entrain gamma oscillations in the brain, reducing perceptible flicker and enhancing brain health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LED driving current is modulated at high frequency to eliminate perceptible flicker, then visual comfort is improved, but the ability to entrain gamma oscillations in the brain is reduced
Solution Approach 1:
The patent applies periodic modulation to the LED driving current at specific frequencies (e.g., 40 Hz) to achieve dual objectives: the high-frequency component eliminates perceptible flicker while the periodic nature at gamma-band frequencies entrains neural oscillations. The modulated current follows a periodic pattern that simultaneously addresses visual comfort and cognitive enhancement.
Solution Approach 2:
The patent changes the temporal parameters of LED modulation, specifically using duty cycles between 20-80% and modulation frequencies in the gamma range (30-90 Hz). By adjusting these parameters, the system achieves imperceptible flicker while maintaining the ability to stimulate neural gamma oscillations, resolving the contradiction between visual comfort and brain health benefits.
2Ease of manufacture
If LED luminaires use conventional driving circuits, then manufacturing simplicity is maintained, but health risks from flicker-induced seizures and headaches increase
Solution Approach 1:
The patent introduces a phase-amplitude circuit as an intermediary component between the power supply and LED arrays. This circuit generates modulated driving currents with specific temporal characteristics that eliminate harmful flicker while maintaining manufacturing feasibility. The intermediary circuit translates conventional power input into health-safe LED driving signals.
Solution Approach 2:
The patent modifies the electrical parameters of the LED driving circuit, specifically implementing current modulation at frequencies above the flicker fusion threshold (e.g., 40 Hz and higher). This parameter change eliminates perceptible flicker and associated health risks while using commercially available components, maintaining ease of manufacture.
3Productivity
If multiple LED arrays are modulated at different frequencies, then gamma oscillation entrainment is enhanced, but device complexity increases
Solution Approach 1:
The patent divides the LED lighting system into multiple independently controllable arrays or groups. Each segment can be modulated at different frequencies (e.g., some arrays at 40 Hz, others at 60 Hz), allowing enhanced gamma oscillation entrainment through frequency diversity while keeping each individual control circuit relatively simple.
Solution Approach 2:
The patent combines multiple modulation signals within a single phase-amplitude circuit architecture. The circuit integrates frequency multiplication and signal generation functions to produce multiple frequency components that drive different LED arrays, achieving complex brain stimulation patterns without requiring separate complex control systems for each array.
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 reduces perceptible flicker, endogenously entrains gamma oscillations, and enhances cognitive functions by modulating LED arrays at frequencies that are imperceptible to the human eye, thereby addressing health risks and improving brain health.
Implementation Method 1
a first LED array and a second LED array, each with a forward voltage... configured to produce a first set of driving current and a second set of driving current... to respectively drive the first set of LED arrays and the second set of LED arrays
Data Source
AI summary
A light-emitting diode (LED) luminaire comprising two sets of LEDs, a phase-amplitude circuit, and an LED driving circuit is used to replace a conventional luminaire with a possible severe temporal light artifact. The phase-amplitude circuit is configured to produce two sets of modulating signals with a predetermined phase retardation between the two. The LED driving circuit is configured to produce two sets of LED driving current in response to the two sets of modulating signals and to drive the two sets of LEDs, resulting in imperceptible visual stimuli at temporal modulation frequencies as a result of possible frequency pre-mix. On the other hand, the imperceptible visual stimuli in another embodiment may cause human brain to perceive modulated lighting stimuli and to demodulate thereof into a benign stimulus in the brain without an apparent flicker, thereby endogenously entraining a gamma oscillation, and drastically reducing eyestrain and visual discomfort.