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公开(公告)号：DE69714175T2
公开(公告)日：2003-02-13
申请号：DE69714175
申请日：1997-09-19
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY , PIETRZAK CHRISTOPHER CARLO
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.
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公开(公告)号：DE69805678D1
公开(公告)日：2002-07-11
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：DE69522070T2
公开(公告)日：2002-05-02
申请号：DE69522070
申请日：1995-09-28
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW
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：DE69525980D1
公开(公告)日：2002-04-25
申请号：DE69525980
申请日：1995-12-27
Applicant: IBM
Inventor： KNOX ANDREW , BEETESON JOHN
IPC: H01J31/12 , B41J2/447 , G09G1/20 , G09G3/22 , H01J3/02 , H01J3/24 , H01J9/02 , H01J29/46 , H01J29/68 , H01J29/70 , H01J29/80 , H01F1/113
Abstract: An electron source having a cathode and a permanent magnet having perforated channels extending between opposite poles of the magnet. Each channel forms electrons received from the cathode into an electron beam for guidance towards a target. The electron source has applications in a wide range of technologies, including display technology and printer technology.
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公开(公告)号：GB2353633A
公开(公告)日：2001-02-28
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: Display device comprising a cathode 20, a permanent magnet 60, a two dimensional array of rows and columns of channels 70 extending 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 where the pixels may be made up of a plurality of sub-pixels. Grid electrode 40 is disposed between the cathode and the magnet whilst anode means 50 is disposed between the screen and the magnet. Anode means 50 may comprise a plurality of pairs of anodes extending parallel to the columns of channels and each pair having first and second anodes extending along opposite sides of the corresponding column of channels. A focus electrode 120 is disposed between the screen and the anode means and may comprise a plane electrical conductor having slots aligned with a different column of channels. Control signals are supplied to the grid electrode to selectively control the flow of electrons from the cathode through each channel to the corresponding pixel. An anode drive circuit supplies anode drive signals to the anode means for accelerating electrons through the channels. The anode drive signals may comprise deflection signals to sequentially deflect electrons emerging from each channel towards different sub-pixels of the corresponding pixel. A focus drive circuit supplies a signal to the focus electrode to focus the electrons emerging from the channels onto the screen. The focus electrode may be driven with a parabolic waveform. The beams of electrons travelling from the cathode means to the screen may be rotated by varying the signal supplied to the focus electrode.
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Patent Agency Ranking
公开(公告)号：DE69515085D1
公开(公告)日：2000-03-23
申请号：DE69515085
申请日：1995-06-27
Applicant: IBM
Inventor： BEETESON JOHN , KERIGAN SHAUN
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).
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公开(公告)号：DE69507344D1
公开(公告)日：1999-02-25
申请号：DE69507344
申请日：1995-08-15
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW
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.
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公开(公告)号：GB2323964A
公开(公告)日：1998-10-07
申请号：GB9706992
申请日：1997-04-05
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
Abstract: A permanent magnet 140 for use in a magnetic matrix display comprising a cathode 20, anode 30 and control grids 71, 72, has a two dimensional array of apertures 160 between opposite poles of the magnet. The direction of the magnetic field is such that the magnet generates, in each aperture, a collimating magnet field for forming electrons from the cathode into an electron beam. A 'keeper' area around the periphery of the magnet is used to improve the linearity of the field strength in the apertures from apertures at the centre of the magnet to apertures at the periphery of the magnet. The 'keeper' area may have control circuits placed on the surface of that area of the magnet. The keeper area may contain apertures which are not used for collimation and into which electrons are prevented from entering by a grid electrode or by a physical blocking means.
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公开(公告)号：GB2322471A
公开(公告)日：1998-08-26
申请号：GB9703807
申请日：1997-02-24
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY , PIETRZAK CHRISTOPHER CARLO
Abstract: A virtual remote cathode, e.g. for a matrix addressed electron beam display, has the position of a space charge cloud associated with it fixed by the geometry of a fixed apertured insulating plate 902. The plate 902 can be made to accurate dimensions and hence the cathode 510 to control grid 502 dimension 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, which may have a metal coating, is located on a surface of the control grid 502 facing the cathode. Electrons which pass the control grip 502 enter channels in a collimation block 506 which may be magnetic or electrostatic. The cathode 510 may comprise thermionic emitters from which electrons are extracted by an extractor grid 514.
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公开(公告)号：GB2321335A
公开(公告)日：1998-07-22
申请号：GB9700790
申请日：1997-01-16
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
Abstract: A display device comprises field emission cathode means 20, e.g. an array of microtips, carbon nanotubes or an Ml composite, for emitting electrons. A plurality of electron beams are formed from the field emission cathode means and pass through channels in a magnet 140. A screen, which has a phosphor coating 150 facing the cathode receives the plurality of electron beams. The phosphor coating comprises a plurality of pixels each corresponding to a different one of said plurality of electron beams. A grid electrode means 71, 72 is disposed between the cathode means and the screen for controlling the flow of electrons from the cathode means. The field emission cathode means 20 comprises extractor grid means (fig 5), having a plurality of separately addressable portions 402-408 associated with each of said plurality of pixels to allow beam current control. The portions may be circular, as shown, or quadrilateral, with the areas of the portions increasing in a binary sequence. A gamma transfer function between input data value and beam current is provided in order to emulate a conventional CRT. This can be achieved by use of a lookup table.
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