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公开(公告)号：GB2294172A
公开(公告)日：1996-04-17
申请号：GB9420729
申请日：1994-10-14
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
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.
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公开(公告)号：NO941869L
公开(公告)日：1994-12-16
申请号：NO941869
申请日：1994-05-19
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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公开(公告)号：FI942813A
公开(公告)日：1994-12-16
申请号：FI942813
申请日：1994-06-14
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN S
IPC: G09G1/00 , H01J20060101 , H01J15/04 , H01J29/00 , H01J29/06 , H01J29/98 , H04N3/16 , H04N9/29 , H01J
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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公开(公告)号：FI942813A0
公开(公告)日：1994-06-14
申请号：FI942813
申请日：1994-06-14
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN S
IPC: G09G1/00 , H01J20060101 , H01J15/04 , H01J29/00 , H01J29/06 , H01J29/98 , H04N3/16 , H04N9/29 , H01J
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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公开(公告)号：DE69720148T2
公开(公告)日：2003-12-18
申请号：DE69720148
申请日：1997-11-13
Applicant: IBM
Inventor： KNOX ANDREW RAMSAY , BEETESON JOHN STUART
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：DE69720148D1
公开(公告)日：2003-04-30
申请号：DE69720148
申请日：1997-11-13
Applicant: IBM
Inventor： KNOX ANDREW RAMSAY , BEETESON JOHN STUART
Abstract: 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.
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公开(公告)号：DE69806542T2
公开(公告)日：2003-03-20
申请号：DE69806542
申请日：1998-04-27
Applicant: IBM
Inventor： KNICKERBOCKER JOHN ULRICH , KNOX ANDREW RAMSAY , ROSENBERG ROBERT , HUMENIK JAMES N
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公开(公告)号：GB2348513B
公开(公告)日：2003-02-19
申请号：GB9907292
申请日：1999-03-31
Applicant: IBM
Inventor： KNOX ANDREW RAMSAY
Abstract: An improved head-up display enables a user to view a light emitting display and an ambient environment simultaneously. The improved display comprises a light-transmissive block allowing the transmission of light from the ambient environment to the user's eye through the block from a first surface to a second surface opposing the first surface. A light emitting display is located on a third surface of the block, the third surface being substantially perpendicular to the first and second surfaces. A beam splitter has a plane surface arranged at substantially 45 degrees to the first and second surfaces, so as to reflect light from the light emitting display through the second surface. A shutter is located on the first surface and is adapted to block the transmission of light from the ambient environment to the user's eye. This provides a dark background for the light emitting display.
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公开(公告)号：DE69805678T2
公开(公告)日：2003-01-23
申请号：DE69805678
申请日：1998-01-29
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY , PIETRZAK CHRISTOPHER CARLO
Abstract: A virtual remote cathode has the position of a space charge cloud associated with it fixed by the geometry of a fixed insulating plate (902). The plate (902) can be made to accurate dimensions and hence the virtual remote cathode to control grid (502) distance can be accurately controlled and will not change as a result of any mechanical, electrical or physical changes in the construction. The fixed insulating plate (902) is located on a surface of the control grid (502) facing the cathode (510).
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公开(公告)号：DE69804702D1
公开(公告)日：2002-05-16
申请号：DE69804702
申请日：1998-01-29
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
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.
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