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    11.
    发明专利
    未知

    公开(公告)号：DE69804702T2

    公开(公告)日：2005-03-24

    申请号：DE69804702

    申请日：1998-01-29

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: H01J31/15 ,  H01J29/46 ,  H01J29/68 ,  H01J31/12 ,  H04N5/68

    Abstract: A display device comprises a cathode means (20) for emitting electrons and a permanent magnet (60) having a two dimensional array of channels (70) extending 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 (90) receives an electron beam from each channel, the screen having a phosphor coating (80) facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of areas, each area being capable of illumination, at least one of the areas being capable of illumination by a plurality of the electron beams. Grid electrode means (40) are 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 elements each element corresponding to a different area of the phosphor capable of illumination. First anode means (50) is disposed between the magnet and the screen for accelerating the electron beam towards the screen.

    14.
    发明专利
    未知

    公开(公告)号：DE69505846D1

    公开(公告)日：1998-12-10

    申请号：DE69505846

    申请日：1995-06-15

    Applicant: IBM

    Inventor： BEETESON JOHN

    IPC: H04N9/12 ,  G09G1/00 ,  G09G1/16 ,  H04N3/26

    Abstract: PCT No. PCT/GB95/01396 Sec. 371 Date May 30, 1997 Sec. 102(e) Date May 30, 1997 PCT Filed Jun. 15, 1995 PCT Pub. No. WO96/17470 PCT Pub. Date Jun. 6, 1996Cathode ray tube display apparatus comprises a cathode ray display tube (210) in which an electron beam spot is scanned in a raster pattern to produce an output image. Drive means (200) generates drive voltages on the focus electrode, first and second grid electrodes, and a cathode of the cathode ray tube to generate the electron beam spot in the cathode ray tube. Spot size control means (120) simultaneously varyies, in response to a spot control signal, the voltages generated on the focus electrode, first and second gird electrodes and the cathode by the drive means to vary the size of the electron beam spot in the cathode ray tube.

    Display device
    15.
    发明专利
    Display device 未知

    公开(公告)号：GB2322470A

    公开(公告)日：1998-08-26

    申请号：GB9703741

    申请日：1997-02-22

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: H01J31/15 ,  H01J29/46 ,  H01J29/68 ,  H01J31/12 ,  H04N5/68 ,  H01J63/06 ,  G09F9/30

    Abstract: A display device, e.g. a temperature gauge for a car or aircraft, comprises a cathode (20) for emitting electrons and a permanent magnet (60) having a two dimensional array of channels (70) extending between opposite poles of the magnet. The magnet generates, in each channel, a magnetic field for forming electrons from the cathode into an electron beam. A screen (90) receives an electron beam from each channel, the screen having a phosphor coating (80) facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of areas each being capable of illumination by a plurality of the electron beams. Grid electrodes (40) are disposed between the cathode and the magnet for controlling flow of electrons from the cathode into each channel, the grid electrode comprising a plurality of elements each element corresponding to a different area of the phosphor capable of illumination. An anode (50) is disposed between the magnet and the screen for accelerating the electron beam towards the screen. As shown, each phosphor area is a stripe, there being two blue phosphor stripes, twelve green, two yellow and three red. The position and colour of the phosphor illuminated represents temperature.

    Cathode ray tube display apparatus
    18.
    发明专利
    Cathode ray tube display apparatus 未知

    公开(公告)号：GB2295756A

    公开(公告)日：1996-06-05

    申请号：GB9425036

    申请日：1994-12-02

    Applicant: IBM

    Inventor： BEETESON JOHN

    IPC: H04N9/12 ,  G09G1/00 ,  G09G1/16 ,  G09G1/14

    Abstract: Cathode ray tube display apparatus comprises a cathode ray display tube (210) in which an electron beam spot is scanned in a raster pattern to produce an output image. Drive means (200) generates drive voltages on the focus electrode (610, G3, G4), first and second grid electrodes (600 G1, G2), and a cathode (K) of the cathode ray tube to generate the electron beam spot in the cathode ray tube. Spot size control means (120) simultaneously varies, in response to a spot control signal, the voltages generated on the focus electrode, first and second gird electrodes and the cathode by the drive means to vary the size of the electron beam spot in the cathode ray tube. The spot size control is such as to reduce moire interference and the control may be in response to a manual or an automatic signal, generated from an analyse of the spatial distribution of the video signal.

    20.
    发明专利
    未知

    公开(公告)号：FI915348A0

    公开(公告)日：1991-11-13

    申请号：FI915348

    申请日：1991-11-13

    Applicant: IBM

    Inventor： SMITH KENNETH GEORGE ,  BEETESON JOHN

    IPC: H01J29/76 ,  H01J29/00 ,  H04N9/29 ,  H01J

    Abstract: A display comprising a cathode ray display tube (1) having an electromagnetic deflection yoke (2) is described. A pair of first deflection coils (7,6) are located symmetrically about the longitudinal axis of the tube (1) on opposite sides of the yoke (2) for producing within the tube (1) a first magnetic deflection field. A pair of second deflection coils (8,20) are similarly located symmetrically about the longitudinal axis on opposite sides of the yoke (2) for producing within the tube (1) a second magnetic deflection field at right angles to the first deflection field. The display is further provided with a pair of first cancellation coils (4,3) connected to the first deflection coils (7,6) for producing a first cancellation field which tends to cancel a first stray field produced by the first deflection coils (7,6). Support means (10,11) secure the first cancellation coils symmetrically about the longitudinal axis. The display additionally comprises a pair of second cancellation coils (50,32) coupled to the second deflection coils (8,20) for producing a second cancellation field which tends to cancel a second stray field produced by the second deflection coils (8,20). Further support means (51,52) are provided for positioning the second cancellation coils (50,32) symmetrically about the longitudinal axis in such a way that a plane containing a second cancellation coil (50) is perpendicular to any plane containing a first cancellation coil (4). Preferably, the display also comprises control means (64) for generating a predetermined cancellation current in the second cancellation coils (50,32) in response to a particular second deflection current in the second deflection coils (8,20).

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