Patent ID: 6377003
Filing Date: 2002-04-23
Classification: H01J

Abstract:
An electron gun for a color index cathode ray tube (CRT) having a display screen with a plurality of horizontally aligned, vertically spaced phosphor stripes, wherein a video image is formed by sweeping a plurality of electron beams over said phosphor stripes in a raster-like manner, wherein each electron beam provides one of the three primary colors of red, green or blue of the video image, said electron gun comprising:a cathode for providing energetic electrons; a beam forming region (BFR) disposed adjacent to said cathode and including first and second spaced, charged grids, wherein each of said grids includes first and second vertically aligned, grouped arrays of apertures for forming said electron beams into a first leading and a second trailing group of electron beams as said electron beams are swept over the display screen, and wherein said first leading and said second trailing groups of electron beams are horizontally spaced from one another, with the electron beams in each group in vertical alignment and directed onto a respective phosphor stripe for providing one of the primary colors; a lens disposed intermediate said BFR and the CRT's display screen for focusing the electron beams on the display screen; and a plurality of video signal sources coupled to either said cathode or to one of said grids in said BFR for providing color video signals thereto in modulating each of said electron beams in accordance with said color video signals; and a circuit for delaying the video signals displayed by said first leading group of electron beams relative to the video signals displayed by said second trailing group of electron beams in synchronizing the display of those portions of a video image formed by said first leading and second trailing groups of electron beams.