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    31.
    发明专利
    未知

    公开(公告)号：FI915348A

    公开(公告)日：1992-05-28

    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).

    32.
    发明专利
    未知

    公开(公告)号：DE69714175D1

    公开(公告)日：2002-08-29

    申请号：DE69714175

    申请日：1997-09-19

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY ,  PIETRZAK CHRISTOPHER CARLO

    IPC: H01J17/49 ,  H01J29/02 ,  H01J29/04 ,  H01J29/48 ,  H01J29/68 ,  H01J29/86 ,  H01J29/87 ,  H01J31/12

    Abstract: A display device comprises a screen. A back plate is sealed to the screen to form an evacuated chamber. Area cathode means is disposed between the back plate and the screen. A permanent magnet is disposed between the cathode and the screen. A two dimensional array of rows and columns of channels extends between opposite poles of the magnet for receiving electrons from the cathode means. An anode phosphor layer is disposed between screen and the magnet for receiving electrons from the channels. Grid electrode means between the area cathode means and the magnet controls flow of electrons from the cathode means into the channels. Anode means between the magnet and the anode phosphor layer controls flow of electrons from the channels towards the screen. In one such arrangement, the screen comprises a layer of a plastic material. In another such arrangement a plurality of spacers are disposed between the screen and the magnet. Each spacer has an elongate body having a larger cross sectional area at one end of the spacer tapering to a smaller cross sectional area at the other end of the spacer. In another such arrangement, and a plurality of spacers are disposed between the magnet and cathode. The spacers are located in recesses formed in the grid electrode means. In yet another such arrangement, the cathode means comprises a back-plate and a silica glass substrate peripherally sealed to the back-plate to produce a chamber. A gas is contained in the chamber. A layer of photo-sensitive material is disposed on the surface of the substrate external to the chamber. A cathode phosphor layer is disposed between the back plate and the substrate. A pair of electrodes facing each other from opposite sides of the chamber energises the gas to generate a plasma for exciting the phosphor to generate light energy to produce electron emissions from the photo-cathode.

    33.
    发明专利
    未知

    公开(公告)号：DE69522070D1

    公开(公告)日：2001-09-13

    申请号：DE69522070

    申请日：1995-09-28

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW

    IPC: G01M11/00 ,  G09G1/00 ,  G09G1/16 ,  H04N17/00

    Abstract: Moire interference detection apparatus (100;110) for a raster-scanned cathode ray tube display comprises a band-pass filter (360;750) for generating an output signal (395;790) in response to a signal indicative of the pixel frequency of a displayed image in a direction of raster scan falling within the pass band of the filter. Control means (350;270) varies the centre frequency of the pass band of the filter in dependence on an active video period of the image in said direction of raster scan, the spacing of adjacent phosphor elements of the cathode ray display tube (210) of the display in said direction of raster scan, and the scan size in said direction of raster scan.

    Display device
    34.
    发明专利
    Display device 未知

    公开(公告)号：GB2353633B

    公开(公告)日：2001-04-11

    申请号：GB0027015

    申请日：1996-06-13

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: G09G1/20 ,  G09G3/22 ,  H01J29/68 ,  H01J29/86 ,  H01J31/15 ,  H04N13/00 ,  H01J31/12 ,  H01J29/58 ,  H01J29/70

    Abstract: A display device comprises a cathode and a permanent magnet. A two dimensional array of rows and columns of channels extends between opposite poles of the magnet for receiving electrons from the cathode. A screen has a plurality of phosphor pixels each corresponding to a different channel and each comprising a plurality of sub-pixels facing the side of the magnet remote from the cathode. Grid electrode means is disposed between the cathode means and the magnet. A plurality of pairs of anodes are disposed between the magnet and the screen and extending parallel to the columns of channels. Each pair corresponds to a different column of channels and each pair has first and second anodes extending along opposite sides of the corresponding column of channels. Address means supplies control signals to the grid electrode means to selectively control flow of electrons from the cathode through each channel to the corresponding pixel. An anode drive circuit supplies anode drive signals to the first and second anodes respectively. The anode drive circuit comprises bias means for generating an acceleration component of each anode drive signal for accelerating electrons through the channels, deflection means for generating a deflection component of each anode drive signal for deflecting electrons emerging from each channel towards different sub-pixels of the corresponding pixel, and correction means for varying the deflection component to align the deflected electron beams with the corresponding sub-pixels.

    35.
    发明专利
    未知

    公开(公告)号：DE69515085T2

    公开(公告)日：2000-09-14

    申请号：DE69515085

    申请日：1995-06-27

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KERIGAN SHAUN

    IPC: G06F13/00 ,  G06F3/00 ,  G09G5/00 ,  G06F3/14

    Abstract: Data processing apparatus includes a system unit (10), a display device (20) for displaying data generated by the system unit (10), display communication means (60,70) for communicating data between the display device (20) and the system unit (10), a peripheral device (30), and peripheral communication means (80,60) for communicating data between the peripheral device (30) and the system unit (10). The peripheral communication means (80,60) includes a wire-less communication link (80) between the display device (20) and the peripheral device (30).

    36.
    发明专利
    未知

    公开(公告)号：DE69505846T2

    公开(公告)日：1999-07-08

    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.

    Current sensing in vacuum electron devices
    38.
    发明专利
    Current sensing in vacuum electron devices 未知

    公开(公告)号：GB2313703A

    公开(公告)日：1997-12-03

    申请号：GB9611469

    申请日：1996-06-01

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: H01J29/02 ,  H01J1/00 ,  H01J7/44 ,  H01J19/82 ,  H01J29/68 ,  H01J29/98 ,  H01J31/12 ,  H01J37/24 ,  H01J61/56 ,  H04N5/59

    Abstract: A vacuum electron device 10, e.g. a diode, triode, synchrotron, magnetron, cyclotron, CRT or electron beam lithography apparatus, is provided with a sensor electrode 40 to monitor electron beam current. The sensor may be a plate, e.g. of tapering shape, which intercepts part of the beam to monitor the current directly, or may be an element which responds indirectly to a magnetic field induced by the beam current. A signal representing the sensed current can be used in a feedback circuit 110,120,130 to adjust the potential on cathode 20 and/or the grid 70 to stabilise the beam current. The cathode may be a thermionic cathode, a photocathode, a field emission cathode or a metalinsulator-metal cathode, the feedback circuit compensating for the effects of cathode ageing. A magnetic matrix display device embodying the invention is described in which the plane cathode is divided into a plurality of selectively actuable strips.

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