A flat display panel and a related repairing method are provided. Therein, a carbon wire heating element using carbon fibers is sealed in a quartz glass member, wherein absorption water quantity of the carbon wire heating element is 2\xd710\u22123 gcm3 or less. Obtaining the same light propagation axis is made possible by using the optical element to make the two light propagation axes coincidental or by using a separate optical element to perform this function. The tray is connected to the feeder with a first and a second cavity formed at the exit area of the feed tray and the front of the feeder such that media items moved from the tray into the feeder are supported on a portion of the media item bottom edge. This distributed system never generates a split brain in principle, and never interrupts a process upon occurrence of a failure due to time-out since it does not perform any failure detection.