研究目的
Investigating the impacts of visible light communication (VLC) on the fundamental properties of energy efficiency, light quality and life expectancy of a light-emitting diode (LED) that is primarily designed for lighting or display, and delivering the required approach for optimising VLC and safeguard the LED’s reliability, durability and emitted light quality.
研究成果
The results showed that neither digital nor continuous usage caused a significant shift in colour of light emitted by the LED. The average current used to drive the LED is the crucial value that will determine the longevity and reliability of the device, not the instantaneous current. This work highlights the necessity of maintaining the overall average current when transmitting the signal, which will be a key in the development of VLC.
研究不足
The study focused on two specific types of LEDs and two methods of producing VLC. The impact of VLC on other types of LEDs and methods of producing VLC remains to be investigated.
1：Experimental Design and Method Selection:
The study compared two LED types (warm white and cool white) and two different methods of producing VLC: on-off keying (OOK) for a pulse-based signal and DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) for a continuous signal. LEDs that did not carry a signal were used as a control.
2：Sample Selection and Data Sources:
LEDs were thermally managed by following the manufacturer’s heat-sink requirements. Light quality and energy consumption measurements were recorded in the dark to eliminate any potential interference from background light.
3：List of Experimental Equipment and Materials:
Not specified.
4：Experimental Procedures and Operational Workflow:
A random signal was generated and adapted to average out at a constant current equal to the recommended drive current of the LED.
5：Data Analysis Methods:
The quality metrics of the light produced by LEDs during VLC were measured and compared.
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