Patent ID: 6479937
Filing Date: 2002-11-12
Classification: H01J

Abstract:
A beam index cathode ray tube (CRT) comprising:a display screen having a plurality of vertically spaced, horizontally aligned, parallel linear phosphor stripes disposed on an inner surface thereof; an electron gun including: cathode means for providing energetic electrons; a beam forming region (BFR) for forming the energetic electrons into a plurality of spaced electron beams each having a horizontally elongated cross section, wherein one or more of said beams are vertically offset from one another; lens means disposed intermediate said BFR and said display screen for focusing the electron beams on the display screen in the form of a plurality of vertically offset electron beam spots each disposed on a respective phosphor stripe; and electromagnetic deflection means disposed intermediate said electron gun and said display screen for deflecting said electron beams over said display screen in a raster pattern, wherein each electron beam is incident upon and each electron beam spot scans a respective color phosphor stripe.