THESIS
2020
xii, 74 pages : illustrations ; 30 cm
Abstract
Quantum Rod/Dot Enhancement Film (QREF/QDEF) has been used in a wide range of display
products for color enhancement. In this project, the application quantum rod/dot film in Li-Fi
communications systems is investigated. QREF/QDEF fabricated at the State Key Laboratory of
Advanced Displays and Optoelectronics Technologies (SKL of ADT) of HKUST would be used in
the proposed Li-Fi communication system. Communication parameters and overall performance
would then be evaluated.
Currently, research on visible light communication (VLC) focuses on the usage and applications of
a wide range of visible light transmitters (LEDs, μLEDs, LCD backlights, laser diodes, etc.) and
receivers (Photodiodes, CMOS cameras, etc.). Although there are already comprehensive
measurements of the performan...[
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Quantum Rod/Dot Enhancement Film (QREF/QDEF) has been used in a wide range of display
products for color enhancement. In this project, the application quantum rod/dot film in Li-Fi
communications systems is investigated. QREF/QDEF fabricated at the State Key Laboratory of
Advanced Displays and Optoelectronics Technologies (SKL of ADT) of HKUST would be used in
the proposed Li-Fi communication system. Communication parameters and overall performance
would then be evaluated.
Currently, research on visible light communication (VLC) focuses on the usage and applications of
a wide range of visible light transmitters (LEDs, μLEDs, LCD backlights, laser diodes, etc.) and
receivers (Photodiodes, CMOS cameras, etc.). Although there are already comprehensive
measurements of the performance of the currently available systems, the transient response time of
the transmitter and receiver themselves are rarely concerned. The ambient environment, setup of
the signal processing components and more importantly, the intrinsic properties of the transmitter
and receiver themselves contribute to the limitations of transmission distance and bit error rate
(BER) of the communication systems. Most of the proposed communications systems that employs
light emitting diodes (LEDs) based on phosphors coating as the transmitter, however, implicitly
consider the delay induced by the phosphors coating into the overall limitations of the
communication systems. In these systems, white wideband LED coated with phosphors is used as
the transmitter and a wideband receiver is used as the receiver. This implies that the lifetime (or the
fall time) of phosphors coating of the white LED upon on-off key (OOK) switching (in μs scale)
contributes to part of the error induced in the proposed communication system. Upon suitable
constructions, the VLC performance of blue LCD backlight unit with QREF/QDEF film to produce
white light will be compared with that of white phosphorescent backlight.
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