factors of portable electronic devices may be provided in any case an overlaying image also known as a heads up display hud enables a user to precisely locate a rfid tagged item and provides opportunity to present additional information associated with the rfid tagged item a hud is any type of display that presents data without blocking the user 39 s view this technique was pioneered for military aviation and is now used in commercial aviation motor vehicles and other applications the hud can be integrated into glasses or goggles 202 or can be a stand alone screen in which the display element moves with the user 39 s head such an arrangement is based on a monitoring of the user 39 s direction of sight and a determination of the appropriate image to be presented that is the portable electronic device 102 monitors the direction a user is looking and determines the rfid tag information to be displayed and the position in which it is to be displayed such an arrangement enables a user to be presented with additional information on a display screen in a position related to the location that the rfid tagged item is seen in the display screen 204 or 206 huds include a display element 204 and 206 which is largely transparent meaning the information is displayed in contrasting superposition over the user 39 s unobstructed view a common technique by which current huds are implemented is to project an image onto a clear glass optical element called a combiner current display technologies that have been demonstrated include liquid crystal lc liquid crystal on silicon lcos digital micro mirrors dmds organic light emitting diode oled and lasers as shown in fig2 the display 204 and 206 depicts an image of.