Patent ID: 6051921
Filing Date: 2000-04-18
Classification: H01J

Abstract:
A display device comprising: cathode means for emitting electrons; a permanent 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; grid electrode means disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel; and wherein the magnet extends in at least one dimension of the two dimensions of said array beyond the area occupied by said array of channels such that the field strength in the channels at the periphery of the array is substantially equal to the field strength in channels at the centre of the array.