Patent ID: 7045947

Claim:
A vacuum display device comprising: a display screen ( 30 ) for displaying image information, said display screen comprising picture elements ( 35 ) arranged in a first array; cathode means ( 20 ) for forming a plurality of electron beams (EB) arranged in a second array, said second array being in conformity with the first array, so that each electron beam (EB) corresponds to a picture element ( 35 ) of the display screen ( 30 ); addressing means ( 41 , 42 ) for addressing the picture elements ( 35 ) by modulating the corresponding electron beam (EB) in accordance with the image information and a channel structure ( 10 ) provided with electron beam guidance cavities ( 15 ) arranged in a third array, said third array being in conformity with the first array, for guiding each electron beam (EB) to the corresponding picture element ( 35 ) of the display screen ( 30 ), said electron beam guidance cavities ( 15 ) each having an entrance ( 16 ) facing the cathode means ( 20 ) and an exit aperture ( 17 ) facing the display screen ( 30 ), characterized in that said channel structure ( 10 ) is arranged adjacent said cathode means ( 20 ), and said entrance ( 16 ) is larger than said exit aperture ( 17 ).