公开(公告)号：JP2000040477A

公开(公告)日：2000-02-08

申请号：JP19719599

申请日：1999-07-12

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNICKERBOCKER JOHN ULRICH ,  KNOX ANDREW RAMSAY ,  LOWE ANTHONY CYRIL

IPC: H01J1/46 ,  H01J3/02 ,  H01J29/02 ,  H01J29/46 ,  H01J29/68 ,  H01J31/12

Abstract: PROBLEM TO BE SOLVED: To provide such an electron source that an extracted current density coincides with an emission characteristic of a cathode and there is no interaction between a pixel/array structural part and an extracting grid. SOLUTION: A frame 202 is provided around an extracting grid 200. The extracting grid 200 comprises plural apertures 204, 207. The apertures 204 are etched and have a square shape. The smaller number of apertures 207 have a U-shape. Portions which are not removed from the extracting grid 200 form flap 206 areas. The flaps are mechanically bent at a right angle, to form the extracting grid 200 into a three-dimensional structure from a two-dimensional structure. The flaps 200 are used for precisely separating the extracting grid 200 from a cathode substrate 102. Thereby, the distance between the electron source and the extracting grid 200 can be kept constant.

公开(公告)号：JPH11312458A

公开(公告)日：1999-11-09

申请号：JP901999

申请日：1999-01-18

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY ,  LOWE ANTHONY CYRIL

IPC: H01J9/12 ,  H01J1/34 ,  H01J1/46 ,  H01J29/04 ,  H01J31/12 ,  H04N5/68

Abstract: PROBLEM TO BE SOLVED: To provide a photo-cathode electron source for a flat panel display device that can provide emission uniformity by sticking a photo-electron emission material as a uniform layer. SOLUTION: A photo-cathode electron source 100 suitable to use in a flat panel display device has an extraction grating means 104 to be kept at a positive potential using a photo-cathode surface as a reference during its use. The extraction grating means can be used as a carrier of a non-firing photo-electron emission material to form the emission surface of the photo-cathode. This material is stuck on a surface 103 of a photo-cathode means 102 by its evaporation from the extraction grating 104.

公开(公告)号：JP2000215790A

公开(公告)日：2000-08-04

申请号：JP900499

申请日：1999-01-18

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY ,  LOWE ANTHONY CYRIL

IPC: H01J9/12 ,  H01J1/34 ,  H01J1/46 ,  H01J31/12 ,  H04N5/68

Abstract: PROBLEM TO BE SOLVED: To provide a photocathode electron source for a flat panel display device. SOLUTION: This photocathode electron source suitable for being used in a flat panel display device has an extraction lattice means 104 maintained in a positive potential with a standard of a cathode face during its use. The extraction lattice means 104 can be used as a carrier of non-firing photo-electron emissive material forming the emission face of the photocathode. The material is adhered onto the surface 103 of a photocathode means 102 by evaporation from the extraction lattice 104.

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

IPC: H01J31/12 ,  G09G1/20 ,  G09G3/22 ,  H01J29/68 ,  H01J29/70

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.

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

IPC: H01J31/12 ,  G09G1/20 ,  G09G3/22 ,  H01J29/68 ,  H01J29/70

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.

公开(公告)号：GB2304986B

公开(公告)日：1998-12-30

申请号：GB9604991

申请日：1996-03-08

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY

IPC: H01J31/12 ,  B41J2/447 ,  G09G1/20 ,  G09G3/22 ,  H01J3/02 ,  H01J3/24 ,  H01J9/02 ,  H01J29/46 ,  H01J29/68 ,  H01J29/70 ,  H01J3/18

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.

公开(公告)号：GB2326270A

公开(公告)日：1998-12-16

申请号：GB9712139

申请日：1997-06-12

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY

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

Abstract: A display device comprises a substrate 310, a cathode 20 for emitting electrons, a permanent magnet and one or more supports 504,902 between the substrate and the magnet. A two dimensional array of channels extends between opposite poles of the magnet, the magnet generating, in each channel, a magnetic field for forming electrons from the cathode 20 into an electron beam. A screen 308 receives an electron beam from each channel, the screen having a phosphor coating 150 facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of pixels each corresponding to a different channel. Orthogonal grid electrodes 71,72 are disposed between the cathode and the magnet for controlling flow of electrons from the cathode into each channel, each grid electrode having a plurality of apertures (fig 12), each aperture corresponding to one of the channels. The apertures are of varying diameter or shape, e.g. elliptical, in the vicinity of the supports 504,902 such that localised variations in the emission of electrons by the cathode caused by the supports 504,902 are compensated. The display also has spacers 502 between the screen and the magnet, and anodes 302,304 for accelerating electrons through the channels. The anodes 302,304 are of varying shape in the vicinity of the spacers 502 such that localised variations in the electron beam shape and position caused by the spacers 502 are compensated.

公开(公告)号：GB2298075B

公开(公告)日：1998-09-09

申请号：GB9503227

申请日：1995-02-18

Applicant: IBM

Inventor： BEETESON JOHN STUART

IPC: G02F1/13357 ,  G09G3/34 ,  G02F1/1335

Abstract: A liquid crystal display 10 is backlit by more than one light source 20 which is operated independently. Selective usage of the light sources extends the useful operating time of batteries when the liquid crystal display is used with a portable computer system.

公开(公告)号：GB2318209A

公开(公告)日：1998-04-15

申请号：GB9800718

申请日：1996-02-23

Applicant: IBM

Inventor： BEETESON JOHN STUART ,  KNOX ANDREW RAMSAY ,  KERIGAN SHAUN

IPC: H01J31/12 ,  B41J2/447 ,  G09G1/20 ,  G09G3/22 ,  H01J3/02 ,  H01J3/24 ,  H01J9/02 ,  H01J29/46 ,  H01J29/68 ,  H01J29/70

Abstract: A display system comprises a display screen including a matrix of display elements and a permanent magnet having an array of channels formed therein. Each channel corresponds to a different display element. Each display element comprises a phosphor target, an electron source and means for controlling flow of electrons from the source through the corresponding channel in the magnet onto the target. Addressing means comprises first and second orthogonal conductors defining a grid. Each display element is located at the intersection of a different pair of first and second conductors. Each first conductor is connected to a first control electrode of the control means of each display element in a corresponding line of display elements and each second conductor is connected to a second control electrode of the control means of each display element in a corresponding line of display elements.

公开(公告)号：GB2282307A

公开(公告)日：1995-03-29

申请号：GB9319766

申请日：1993-09-24

Applicant: IBM

Inventor： KNOX ANDREW RAMSAY ,  MARTINEZ PETER ,  ANWYL EDWARD ,  BEETESON JOHN STUART ,  KERIGAN SHAUN

IPC: G06F1/32 ,  G09G5/00 ,  G09G5/10

Abstract: Display apparatus comprises a display screen (400) and a drive circuit (401) connected to the display screen (400) to generate an image on the display screen (400) in response to an input video signal (R,G,B). A timer (405) generates a count in response to a clock signal. A detector (403,404,402) also receives the input video signal and resets the timer (405) on detection of a change in image content between successive frames of the input video signal (R,G,B). Control means (402) is connected to the timer (405) and to the drive circuit (401) for at least partially disabling the drive circuit (401) in response to the count stored in the timer (405) exceeding a predetermined threshold.