Abstract: A radio frequency identification (RFID) technology which overcomes a cross-reading problem by using visible light recognition and identification values. An RFID reader terminal includes a visible light transmitter configured to transmit a visible light signal including an identification value of the RFID reader terminal, a radio frequency (RF) receiver configured to receive an RF signal including an identification value of an RFID tag terminal and information of the RFID tag terminal from the RFID tag terminal, and a reader controller configured to determine whether the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal. In addition, there is provided an RFID tag terminal corresponding to the RFID reader terminal.

Abstract: A backscattering type radio frequency identification (RFID) communication system, and more particularly, a backscattering type RFID communication system in which an RFID tag transmits a signal back to an RF reader by using energy of a carrier wave transmitted by the RFID reader. Provided is a backscattering type radio frequency identification (RFID) communication system RFID communications are performed efficiently without an error while interference between RFID readers does not occur even under an overcrowded reader environment. Interference of RF signals between the RFID readers does not occur, and RFID communications can be efficiently performed even under the overcrowded reader environment. Transmitting and receiving time steps of the RFID readers do not need to be synchronized with one another so that compatibility of the RFID readers can be improved.

Abstract: Provided is an organic light emitting diode (OLED) display device for visible ray communication, including: a substrate; a plurality of OLED pixels that are formed on the substrate and generate a red (R), green (G), or blue (B) visible ray; and a plurality of light receiving units that are formed on the substrate to sense a visible ray signal and convert the visible ray signal to an electrical signal.

Abstract: A visible light multiplex communication system is presented which includes identification (ID) information and data information which can be simultaneously transmitted and received to and from a server and a plurality of clients by using visible light. Visible light ID communication and visible light data communication do not interfere with each other in the same space during visible light communication. In addition, data can be efficiently transmitted and received to and from a plurality of ID clients using visible light. In addition, visible light ID communication and visible light data communication can be efficiently performed in a state where interference between clients using different protocols does not occur in the same place. Furthermore, a specific unit that is capable of efficiently transmitting and receiving data to and from a plurality of clients by using visible light can be provided.

Abstract: A visible light multiplex communication system, and more particularly, a visible light multiplex communication system in which identification (ID) information and data information can be simultaneously transmitted and received to and from a server and a plurality of clients by using visible light, is disclosed. Visible light communication can be smoothly performed in a state where visible light ID communication and visible light data communication do not interfere with each other in the same space. In addition, data can be efficiently transmitted and received to and from a plurality of ID clients and a plurality of data clients by using visible light. In addition, visible light ID communication and visible light data communication can be efficiently performed in a state where interference between a plurality of clients using different protocols does not occur in the same place.