IMAGE DISPLAY APPARATUS

摘要

A video image display apparatus, of the flat tube and multiline cathode type, includes a phosphor screen, and a predetermined number (e.g. 15) of line cathodes for emitting in-turn a predetermined number of horizontal rows of electron beams each row comprises a second predetermined number (e.g. 320) of rod-shaped electron beams which together produce one horizontal line of image on the phosphor screen. Groups of the horizontal lines form vertically extending segments. A vertical deflection means is provided for deflection of each of the respective rows of electron beams in the respective vertically extending segments, by means of a vertical deflection signal, e.g. a step wave having a saw-tooth wave envelope. The envelope is adjusted so as to be expanded or compressed or changed in level, thereby eliminating any undesirable black (or light) horizontal banding on the screen due to non-uniformity of electrode construction. A uniform raster is thereby obtainable.