Patent ID: 6177759
Filing Date: 2001-01-23
Classification: H01J

Abstract:
A display device comprising: a substrate; cathode means for emitting electrons on one side of the substrate; a permanent magnet on the opposite side of the cathode means from the substrate; one or more supports between said substrate and said magnet; a two dimensional array of channels extending between opposite poles of the magnet; the magnet generating, in each channel, a magnetic field for forming electrons from the cathode means into an electron beam; a screen for receiving an electron beam from each channel, the screen having a phosphor coating facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of pixels each corresponding to a different channel; and grid electrode means disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel, said grid electrode means having a plurality of apertures, each aperture corresponding to one of said channels, said apertures being of varying cross-section in the vicinity of the supports such that localized variations in the emission of electrons by the cathode means caused by said one or more supports is compensated.