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    51.
    发明专利
    未知

    公开(公告)号：DE69507344T2

    公开(公告)日：1999-09-09

    申请号：DE69507344

    申请日：1995-08-15

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW

    IPC: G09G1/00 ,  H01J29/56 ,  H01J29/66 ,  H04N3/26 ,  H04N3/27 ,  H04N3/30

    Abstract: Raster demodulation apparatus for a raster-scanned cathode ray tube display comprises control means (400) for varying the shape of at least one scanned electron beam spot (661-663) in a direction perpendicular to scan lines of the raster. The control means (400) comprises an electro-magnet (700) for mounting on the neck of the cathode ray tube. The magnet (700) has eight pole pieces (720-790) spaced around the neck of the cathode ray tube (210). A winding (710) passes around each of the pole pieces (720-790) in succession in opposite directions so that, when an electrical current (I) is passed through the winding, adjacent pole pieces (720-790) around the neck of the cathode ray tube have different magnetic polarity to generate, within the neck of the cathode ray tube (210), a magnetic field in which magnetic lines of force (680) pass through the or each electron beam (661-663) only in a direction parallel to the scan lines of the raster.

    Display device
    55.
    发明专利
    Display device 未知

    公开(公告)号：GB2314201A

    公开(公告)日：1997-12-17

    申请号：GB9612345

    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 ,  H01J29/62 ,  H01J29/70 ,  H04N3/23

    Abstract: A display device comprises a cathode 20 and a permanent magnet 60. A two dimensional array of rows and columns of channels 70 extends between opposite poles of the magnet for receiving electrons from the cathode. A screen 90 has a plurality of phosphor pixels 80 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 40 is disposed between the cathode means and the magnet. A plurality of pairs of anodes 50 are disposed between the magnet and the screen and extending parallel to the columns of channels. Each pair 51,52 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 40 to selectively control flow of electrons from the cathode through each channel to the corresponding pixel. An anode drive circuit 53 supplies anode drive signals to the first and second anodes 51,52 respectively. The anode drive circuit comprises bias means 56 for generating an acceleration component of each anode drive signal for accelerating electrons through the channels, deflection means 57,58 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 59 for varying the deflection component to align the deflected electron beams with the corresponding sub-pixels. For a cylindrical screen 90, the correction means is a parabola generator. The display device may include a focus electrode (120, fig 9) which may also be driven with a parabolic waveform.

    Display system with image scanning apparatus
    56.
    发明专利
    Display system with image scanning apparatus 未知

    公开(公告)号：GB2307817A

    公开(公告)日：1997-06-04

    申请号：GB9524631

    申请日：1995-12-01

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: H04N1/00 ,  H04N1/028 ,  H04N1/10

    Abstract: A display system comprises a display screen and drive means for scanning a picture onto the display screen 10 in response to a video signal. Image scanning apparatus in the display system comprises photo-detection means 160 optically coupled to the display screen for generating an image signal on detection of any light from the scanned picture reflected back into the display screen by an external article and subsequently internally reflected within the display screen. Storage means 150 stores the image signal detected by the photo-detection means.

    Video display apparatus with gamma correction
    57.
    发明专利
    Video display apparatus with gamma correction 未知

    公开(公告)号：GB2305570A

    公开(公告)日：1997-04-09

    申请号：GB9519415

    申请日：1995-09-22

    Applicant: IBM

    Inventor： BEETESON JOHN ,  KNOX ANDREW RAMSAY

    IPC: G09G1/16 ,  H04N5/202 ,  H04N9/69 ,  H04N17/02 ,  H04N17/04

    Abstract: Display apparatus comprises a display screen 10 and drive means for generating an image on the display screen in response to a video signal input from an external video source. The drive means comprises gamma measurement means having a test signal generator 100 for generating a test signal 151 to produce a test image on the display screen, and output detection means for generating a sense signal as a function of the test image produced on the display screen. The output detection means may comprise a photo-detector 240 detecting the light output from CRT 10, or a current sense resistor connected to the EHT transformer (180 Fig 5) of the CRT display EHT generator. The test signal comprises a staircase waveform.

    59.
    发明专利
    未知

    公开(公告)号：DE69022731D1

    公开(公告)日：1995-11-02

    申请号：DE69022731

    申请日：1990-11-27

    Applicant: IBM

    Inventor： SMITH KENNETH GEORGE ,  BEETESON JOHN

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

    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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