A new large area flat CRT consists of a multitude blocks connected in the horizontal direction. For each block, a filament cathode is extended in the vertical direction, a modulation electrode is placed in a parallel position behind the cathode, the vertical addressing electrodes are aligned perpendicular to the modulation electrodes, and the horizontal deflecting erectrodes are placed on either side of the cathode. Because of its simple construction, low production cost may be achieved. This paper reports the optimum configuration of this new large area flat CRT.