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US 2002/0074934 A1Published application
Grid electrodes for a display device
AssigneeInternational Business Machines Corporation
InventorsJohn Stuart Beeteson, Andrew Ramsay Knox, Christopher Carlo Pietrzak
Life of this patent
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Abstract
A magnetic matrix display device has a grid electrode in which differing first grid (G1) and second grid (G2) apertures are used. A sensor element and a second grid electrode are combined as a single structure. Other aspects of the invention relate to a deflection anode having reduced capacitance, the use of a polyimide coating for the grid electrodes, the use of a compliant mounting and adjustment for a grid assembly and the provision of an illuminated border on a magnetic matrix display.
Claims35
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 comprising a plurality of groups of adjacent pixels facing the side of the magnet remote from the cathode, 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 deflection means for sequentially addressing the electron beam from each channel to each pixel of the corresponding group, the deflection means comprising a plurality of anode means each disposed on the surface of the magnet remote from the cathode, each corresponding to a different channel, and each comprising first and second anodes respectively extending along opposite sides of the corresponding channel for accelerating electrons through the corresponding channel and for sequentially addressing electrons emerging from the corresponding channel to different pixels of the corresponding group, a plurality of each of said first and said second anodes being arranged in respective groups, each of the respective groups being driven by respective drivers.
4 more elements
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 comprising a plurality of groups of adjacent pixels facing the side of the magnet remote from the cathode, 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, the grid electrode means comprising a plurality of parallel row conductors and a plurality of parallel column conductors arranged orthogonally to the row conductors, each channel being located at a different intersection of a row conductor and a column conductor, the parallel conductors narrowing in width between said different intersections between each of said row conductors and each of said column conductors.
3 more elements
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 comprising a plurality of groups of adjacent pixels facing the side of the magnet remote from the cathode, 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, the grid electrode means comprising a plurality of parallel row conductors and a plurality of parallel column conductors arranged orthogonally to the row conductors, each channel being located at a different intersection of a row conductor and a column conductor, each intersection having a corresponding aperture in each of said row conductor and said column conductor, the apertures in said row conductors and said column conductors being different in size.
3 more elements
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 comprising a plurality of groups of adjacent pixels facing the side of the magnet remote from the cathode, 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 having a sensor electrode located thereon.
3 more elements
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 comprising a plurality of groups of adjacent pixels facing the side of the magnet remote from the cathode, 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, said grid electrode means being formed on a polyimide substrate.
3 more elements
A display device comprising:
- cathode means for emitting electrons;
- a permanent magnet;
- a two dimensional array of addressable channels extending between opposite poles of the magnet and a plurality of border channels extending in at least a first dimension beyond the area occupied by said two dimensional array of addressable channels;
- 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 addressable 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 addressable channel;
- grid electrode means disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each addressable channel;
- wherein said screen has a phosphor coating corresponding to said border area channels.
4 more elements
Dependencies are inferred from the claim text.