Patent ID: 6121725
Filing Date: 2000-09-19
Classification: H01J

Abstract:
A flat color display screen including:a cathode (1) associated with an electron extraction grid (3);an anode (5') provided with at least two types (7r, 7g, 7b) of phosphor elements, all polarized to a same potential; andat least two additional superposed grids (15, 16, 17), positioned on the extraction grid (3), isolated from each other and from the extraction grid, each of the additional grids provided with holes, each hole of each additional grid being coaxial with one of the holes of each other additional grid, the holes (19, 20; 21, 22; 23, 24) of each additional grid defining sub-pixels (Pr, Pg, Pb), each sub-pixel associated with one of a plurality of colors, each additional grid (15; 16; 17) being associated with one of the plurality of colors, wherein some of the holes (19; 21; 23), of each additional grid are of a smaller diameter than coaxially corresponding holes of the other additional grids, for activating the sub-pixels of the corresponding colors.