Patent ID: 6188178
Filing Date: 2001-02-13
Classification: G09G,H01J,H04N

Abstract:
A display device comprising an envelope including a surface bearing a luminescent screen having a multiplicity of predefined areas and means for selectively energizing respective ones of said areas to produce an image, characterized in that said display device comprises:a. electron emitting means;b. at least one electron transport duct which has an electron-receiving portion in communication with the electron emitting means, has a plurality of output apertures, and has an inner surface which is formed, over a substantial length of the duct, from an insulating material having a secondary emission coefficient which is equal to at least one at every electron energy level within a predetermined range of electron energies;c. means for producing within said duct an electric field with a predetermined field strength for effecting the transport of electrons from the electron-receiving portion to the vicinities of the output apertures by way of electron interactions with said inner surface of insulating material at energies within said predetermined range;d. selection means for selectively effecting the extraction of electron currents from the output apertures; ande. a supporting spacer arranged between the luminescent screen and the at least one electron transport duct and including a plurality of openings for permitting electrons to pass from the output apertures to the predefined areas of the luminescent screen.