A flat display panel is disclosed. In one embodiment, the flat display panel includes i) a first substrate on which a display unit is formed, ii) a second substrate formed to face the first substrate, iii) a resin layer formed on the second substrate; a window formed on the resin layer, iv) a flexible printed circuit (FPC) and a spacer formed between the window and the first end of the FPC. A first end of the FPC is combined with the second substrate, and a second end of the FPC is combined with the first substrate, so that the first substrate and the second substrate are electrically connected to each other.