| 摘要 |
<p>A display device comprises cathode means for emitting electrons and a permanent magnet. A two dimensional array of channels extends between opposite poles of the magnet. The magnet generates, in each channel, a magnetic field for forming electrons from the cathode means into an electron beam. A screen receives an electron beam from each channel. The screen has a phosphor coating facing the side of the magnet remote from the cathode. The phosphor coating comprises a plurality of pixels each corresponding to a different channel. Grid electrode means is disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel. Deflection means sequentially addresses the electron beam from each channel to each pixel of the corresponding group. Rotational alignment means aligns electron beams from the channels with corresponding pixels of the phosphor coating. The rotational alignment means comprises a resistive deflection means and means for generating a differential voltage across one or more elements of the deflection means. The magnitude and direction of the differential voltage across one or more elements of the deflection means is used to provide rotational alignment. The invention also provides a method of alignment of a magnet with phosphor stripes on a screen in a display device by providing a magnet having a two dimensional array of channels extending between opposite poles of the magnet, providing a collimated light source, illuminating the phosphor stripes on a screen through channels in the magnet using the collimated light source, and aligning the two dimensional array of channels with the phosphor stripes. <IMAGE></p> |
