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    Display apparatus with gamma correction
    91.
    发明专利
    Display apparatus with gamma correction 未知

    公开(公告)号：GB2305571B8

    公开(公告)日：2000-01-31

    申请号：GB9519417

    申请日：1995-09-22

    Applicant: IBM

    Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY

    IPC: H04N5/202 ,  H04N9/69

    Abstract: Display apparatus comprises a display screen. Drive means generates an image on the display screen in response to a video signal input from an external video source. The drive means comprises a memory for storing a gamma value and gamma correction means for modifying the input video signal as a function of a gamma value. Gamma variation means permits adjustment or the gamma value stored in the memory in response to a control signal input.

    Magnetic matrix display devices
    94.
    发明专利
    Magnetic matrix display devices 未知

    公开(公告)号：GB2326018A

    公开(公告)日：1998-12-09

    申请号：GB9711744

    申请日：1997-06-07

    Applicant: IBM

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

    IPC: H01J29/46 ,  H01J29/68 ,  H01J31/12 ,  H01J29/02 ,  H01J29/08 ,  H01J29/80

    Abstract: In a magnetic matrix display device comprising a cathode 20, grids 71,72, a magnet 140 having a two-dimensional array of channels 160, anode 30 and a phosphor coating 150 made up of a plurality of pixels, electrons passing through the channels are directed to the pixels by arrays of first and second deflection anodes 302,304. In order to reduce the capacitance of the anodes, each array is divided into number of groups (fig 5), with each group being driven by a respective driver. The grids 71,72, which are arranged in orthogonal rows and columns, have holes corresponding to the entrances to the channels. The holes in one grid may be of a different size to those in the other grid. The capacitance associated with each grid may also be reduced by narrowing them in regions between the channel entrances. A current sensor may be combined with one of the grids. Other aspects of the invention relate to the use of a polyimide coating for the grids, the use of a compliant mounting and adjustment for a grid assembly and the provision of an illuminated border for the display.

    Display device
    95.
    发明专利
    Display device 未知

    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

    IPC: H01J29/68 ,  H01J31/12

    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.

    Self stabilising non-thermionic cathode
    96.
    发明专利
    Self stabilising non-thermionic cathode 未知

    公开(公告)号：GB2322472A

    公开(公告)日：1998-08-26

    申请号：GB9719109

    申请日：1997-09-10

    Applicant: IBM

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

    IPC: H01J31/15 ,  G09G1/20 ,  H01J3/02 ,  H01J29/04 ,  H01J31/12 ,  H01J1/30

    Abstract: A virtual non-thermionic cathode, e.g. for a flat panel electron beam display, as the position of a space charge cloud associated with it fixed by the geometry of a fixed insulating layer 402. The layer 402 can be made to accurate dimensions and hence the cathode 404 to control grid 406 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 layer 402 is located on a surface of the control grid 406 facing the cathode 404. A space charge layer is built up on the surface of the insulating layer 402 facing the cathode 404, and thus emission from the cathode 404 is stabilised.

    Self stabilising cathode
    97.
    发明专利
    Self stabilising cathode 未知

    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

    IPC: H01J31/15 ,  G09G1/20 ,  H01J3/02 ,  H01J29/04 ,  H01J31/12 ,  H01J29/48

    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.

    Display device
    98.
    发明专利
    Display device 未知

    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

    IPC: H01J31/12 ,  H01J29/46 ,  H01J29/52 ,  H01J3/02 ,  H01J29/48

    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.

    Touch sensor input system for a computer display
    99.
    发明专利
    Touch sensor input system for a computer display 未知

    公开(公告)号：GB2295017A

    公开(公告)日：1996-05-15

    申请号：GB9422525

    申请日：1994-11-08

    Applicant: IBM

    Inventor： KNOX ANDREW RAMSAY ,  BEETESON JOHN STUART

    IPC: G06F3/041 ,  G06F3/033 ,  G06F3/044 ,  H01J29/88 ,  H03K17/96

    Abstract: A touch sensor input for a computer display is disclosed in which a conductive coating on the front surface of the display screen is used to determine the position of an object, such as a user's finger, touching the screen. Sensors at the edge of the conductive coating detect changes in the level of ambient field pickup when the user's finger touches the display screen. The conductive coating may optionally be divided into blocks with separate connections to each block, or may have a resistivity profile so as to allow full X and Y co-ordinate determination of the position of the finger. Also, optionally, a stylus generating an electromagnetic field when in contact with the display may be used in place of the finger.

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