LED Grid VLC Signal Control via User Feedback
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Solution Overview
Problem
Conventional LED lighting grids face issues with non-uniform light emission due to aging differences among LED units, leading to unpleasant observation and potential VLC signal decoding problems, along with increased energy usage and faster component aging from higher modulation depths.
Innovation Solution
A system comprising a lighting grid with LED units that transmit VLC signals, a controller receiving quality parameters from user equipment devices to adjust the VLC signal parameters, minimizing modulation depth while maintaining data transmission quality and ensuring uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger modulation depth is used to improve VLC signal quality and ease of decoding, then data transmission quality is improved, but energy usage increases and component aging accelerates
Solution Approach 1:
The system dynamically adjusts the modulation depth of VLC signals in real-time based on feedback about LED aging and environmental conditions. Rather than using a fixed high modulation depth, the system adapts the modulation depth to maintain optimal VLC quality while minimizing energy consumption and component stress.
Solution Approach 2:
The system incorporates feedback mechanisms where user equipment devices report VLC quality parameters and LED aging information to the controller. This feedback loop enables the controller to adjust modulation depth and other VLC parameters to maintain signal quality while reducing energy usage and component aging.
2Reliability
If a higher current is applied to increase modulation depth, then VLC signal quality improves, but component aging increases
Solution Approach 1:
The system dynamically adjusts the current applied to LED units based on real-time aging feedback. As LEDs age and their characteristics change, the system adapts the driving current to maintain optimal VLC signal quality while preventing excessive current that would accelerate further aging and reduce component lifespan.
Solution Approach 2:
The controller receives feedback about LED aging from user equipment devices and adjusts the driving current accordingly. This feedback mechanism ensures that sufficient current is applied to maintain VLC quality while avoiding excessive current that would cause premature component failure.
3Shape
If LED units operate at different currents to compensate for aging, then uniform light emission is maintained, but energy usage increases
Solution Approach 1:
The system applies different control strategies to different LED units based on their individual aging states and environmental conditions. Each LED unit receives customized control parameters to maintain uniform light emission, with the controller adjusting modulation depth and other parameters locally for each unit rather than applying a uniform approach across the entire lighting grid.
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 system achieves real-time adjustment of VLC signal parameters to maintain desired data transmission quality and uniform light emission, reducing energy usage and component aging, and enabling continuous optimization without the need for periodic calibration.
Implementation Method 1
Another advantage provided by LED based illumination systems, is the possibility to include a transfer of data in the light via Visible Light Communication (VLC)
Implementation Method 2
a plurality of LED units which are each adapted to emit light
Data Source
AI summary
The present invention pertains to a system and method for operating at least one LED unit of lighting grid comprising a plurality of LED units, wherein the LED units are configured to transmit a VLC signal including a code word. A plurality of user equipment devices captures the light transmitted by the LED unit and determines parameters related to the light, such as a VLC quality parameter, flicker value, light intensity parameter and light colour parameter. Based on these parameters, a controller determines control parameters for the LED unit. As such, a feedback loop is created wherein the LED unit is controlled based on measurements with the user equipment devices.