Abstract: A terminal device for providing location information of a product of interest in a store. The terminal device includes a communicator configured to communicate with the repeaters; a display configured to display information visibly; a storage module configured to store the information; a product location searcher configured to generate a message to request search for a location of a product of interest based on received product search information that is input by a user, transmit the message to the lighting management server through the repeater, and receive product location information that is specified as a location of a lighting device in proximity to the product of interest through the repeater; and a controller configured to generate product-location-representation information that displays an overlay of the received product location on a map and display the generated information on the display.

Abstract: A light emitting diode (LED) driving apparatus may include: a rectifying unit providing a rectified voltage; an LED array including at least one LED string including first to nth LEDs connected in series; a sink path controller providing first to (n?1)th sink path control signals according to a level of the rectified voltage; a sink path switching circuit unit including first to (n?1)th sink path switches performing a switching operation according to each of the first to (n?1)th sink path control signals; a voltage phase controller generating a phase-adjusted voltage; a source path controller providing first to (n?1)th source path control signals; and a source path switching circuit unit including first to (n?1)th source path switches performing a switching operation according to each of the first to (n?1)th source path control signals.

Abstract: A light emitting diode (LED) driving apparatus may include: a rectifying unit providing a rectified voltage; an LED array including at least one LED string including first to nth LEDs connected in series; a sink path controller providing first to (n?1)th sink path control signals according to a level of the rectified voltage; a sink path switching circuit unit including first to (n?1)th sink path switches performing a switching operation according to each of the first to (n?1)th sink path control signals; a voltage phase controller generating a phase-adjusted voltage; a source path controller providing first to (n?1)th source path control signals; and a source path switching circuit unit including first to (n?1)th source path switches performing a switching operation according to each of the first to (n?1)th source path control signals.