Thin-type picture display device

A display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing an image composed of pixels, said means comprising:

• a. at least one electron source;
• b. a plurality of adjacent, longitudinally extending transport ducts having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having an input portion in communication with the at least one electron source for receiving electrons and having a plurality of apertured extraction locations for enabling the extraction of electrons from the duct;
• c. an arrangement of distribution ducts located between the transport ducts and the luminescent screen, said arrangement including a wall facing the luminescent screen and having at least two selection apertures in communication with each of the extraction locations;
• d. extraction electrode means disposed adjacent the extraction locations for selectively effecting extraction of electrons from the transport ducts at selected ones of said locations;
• e. selection electrode means disposed adjacent the selection apertures for selectively effecting transport of electrons from the distribution ducts through selected ones of the selection apertures;
• and
• f. means for directing toward the screen the electrons which are transported through the selection apertures.