Wireless display device and radio frequency identification system using the same

A radio frequency identification system, including:

• a host, provided for transmitting a first electromagnetic wave and a third electromagnetic wave, and receiving a second electromagnetic wave simultaneously, wherein the first electromagnetic wave carries an identification data and a display data, and the second electromagnetic wave carries a verification message;
• and
• at least one wireless display device, provided for receiving the first electromagnetic wave and the third electromagnetic wave, and transmitting the second electromagnetic wave, wherein the at least one wireless display device obtains the identification data, the display data and a first electric power from the first electromagnetic wave, and obtains a second electric power from the third electromagnetic wave, and transmits the second electromagnetic wave which carries the verification message after verifying the identification data, and wherein the at least one wireless display device obtains power via the first electromagnetic wave and the third electromagnetic wave, and displays an image in accordance with the display data.