EP0153784A1 - Flache Kathodenstrahlröhre - Google Patents

Flache Kathodenstrahlröhre Download PDF

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Publication number
EP0153784A1
EP0153784A1 EP85200213A EP85200213A EP0153784A1 EP 0153784 A1 EP0153784 A1 EP 0153784A1 EP 85200213 A EP85200213 A EP 85200213A EP 85200213 A EP85200213 A EP 85200213A EP 0153784 A1 EP0153784 A1 EP 0153784A1
Authority
EP
European Patent Office
Prior art keywords
electron
electrode array
electron beam
deflection electrode
cathode ray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85200213A
Other languages
English (en)
French (fr)
Other versions
EP0153784B1 (de
Inventor
Francis Geoffrey Blackler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Koninklijke Philips NV
Original Assignee
Philips Electronic and Associated Industries Ltd
Philips Electronics UK Ltd
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd, Philips Electronics UK Ltd, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Electronic and Associated Industries Ltd
Publication of EP0153784A1 publication Critical patent/EP0153784A1/de
Application granted granted Critical
Publication of EP0153784B1 publication Critical patent/EP0153784B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/124—Flat display tubes using electron beam scanning

Definitions

  • the present invention relates to a flat cathode ray tube.
  • cathode ray tube in which the electron beam enters laterally into an electrostatic field between two spaced apart electrodes one of which is carried by a fluorescent screen, which in certain cases is provided on a rear wall of an envelope, whilst the other electrode is transparent and is provided on the faceplate.
  • the electron beam is introduced laterally into the electrostatic field by a pair of deflection plates, the voltage applied to them being varied at frame rates to alter the angle of entry into the electrostatic field and thereby the range. This operation may be regarded as lobbing the electron beam into the electrostatic field.
  • Examples of this type of cathode ray tube are disclosed in British Patent Specifications 1592571 and 2071402 and Specification WO 83/00406. These display tubes suffer from the same drawbacks as the first type of cathode ray tubes.
  • cathode ray tube in which the electron beam is produced by an electron gun mounted behind a screen with its axis parallel to the plane of the screen.
  • the electron beam produced undergoes line scanning after it has left the electron gun. Thereafter it is reflected through 180° before being deflected towards the fluorescent screen.
  • This type of display tube is disclosed in British Patent Specification 739496.
  • British Patent Specification 2101396A In a variation of this type of cathode ray tube it is known from British Patent Specification 2101396A to provide an electron multiplier adjacent to, but spaced from, the fluorescent screen. This has the advantage that the scanning and deflection of the electron beam can be separated from producing a light output-from the cathode ray tube.
  • a flat cathode ray tube having an envelope with a substantially planar faceplate and a rear wall opposite to, and spaced from, said faceplate, and, within the envelope, a fluorescent screen on the inside of the faceplate, an electron multiplier disposed substantially parallel to, but spaced from, the faceplate, a deflection electrode array disposed adjacent a rear wall of the envelope, opposite the faceplate, said deflection electrode array being substantially parallel to and co-extensive with the electron multiplier, means for producing an electron beam, said means being disposed laterally of a space formed between the electron multiplier and the deflection electrode array, said means in use introducing an electron beam into said space in a direction substantially parallel to the deflection electrode array, magnetic means disposed downstream of the path of movement of the electron beam for deflecting the electron beam laterally of its path of movement from the electron gun and means for connecting the electrodes of the deflection electrode array to a source of deflection voltages whereby in response to said deflection voltages the
  • the cathode ray tube used in the apparatus made in accordance with the present invention has the advantages of having substantially the same envelope thickness for a range screen size and also a greater maximum scan angle than is obtainable with electrostatic beam deflectors thereby enabling a wider variety of screen shapes to be made without the problem of deflection defocussing causing poor edge resolution.
  • an electron multiplier particularly a micro-channel plate electron multiplier, a high resolution image is obtainable on the fluorescent screen and also the addressing of the electron multiplier can be carried out using a low voltage, low current electron beam.
  • the cathode ray tube 10 comprises an envelope formed essentially of three parts: a generally box-like display section 12, a cylindrical neck 14 and and a divergent section, hereinafter termed a fan 16, connecting the neck 14 to an edge wall 18 of the display section 12.
  • the display section 12 comprises a substantially planar, optically transparent faceplate 20, a substantially planar rear wall 22 ( Figure 3) which is parallel to the faceplate 20 and edge walls interconnecting the faceplate 20 and the rear wall 22.
  • a fluorescent screen 24 is provided on the internal surface of the faceplate 20.
  • a micro-channel plate electron multiplier 26 is mounted within the display section 12 so that it is parallel to, and co-extensive with, the faceplate 20.
  • a deflection electrode array 28 is provided either on the rear wall 22 if it is of an electrically insulating material or on an electrically insulating substrate which is carried by the rear wall 22.
  • the electrode array 28 comprises a plurality of separate, generally elongate electrodes 30 which may be straight or curved. Electrical connections to the electrodes 30, the electron multiplier 26 and to a transparent electrode on the faceplate 20 are brought out of the envelope via connectors or lead-throughs 32, 34 in the edge wall 18.
  • An electron gun 36 is provided in the neck 14 and is arranged so that its longitudinal axis coincides with the plane of symmetry extending through the thickness of the envelope.
  • the fan 16 has substantially flat upper and lower surfaces with the lower surface being arranged to be co-extensive with the rear wall 22. The cross-sectional height of the fan 16 is less than that of the display section 12. Consequently the electron beam 38 emerges from the electron gun 36 on a path of movement which is closer to the deflection electrode array 28 than the electron multiplier 26.
  • the depth of a space 40 between the electron multiplier 26 and the deflection electrode array 28 is such that the electron beam 38 can be turned from a path of movement parallel to the deflection electrode array 28 to approach the electron multiplier 26 at a substantially constant angle under the influence of the fields produced between the electrodes 30 and the electron multiplier 26.
  • the depth of the space 40 remains same.
  • Scanning coils 42 are provided on the outside of the envelope at the neck-fan transition.
  • the deflection angle for the electron beam to reach the corners furthest from the electron gun 36 is 37° whilst that to reach the nearest corners is 90°.
  • the deflection angle varies from 0° to 90° and at the same time the beam spot size at the input to the electron multiplier 26 has to be substantially constant. This has been found possible by using electromagnetic scanning, rather electrostatic scanning, and providing focusing modulation for the electron spot and keystone correction for the raster.
  • a low voltage, low current electron beam 38 is produced by the electron gun 36 which has a final anode voltage of +400V relative to the cathode voltage (for example OV).
  • the electron beam 38 undergoes line scanning by means of appropriate currents through the scan coils 42.
  • the input side of the electron multiplier 26 is at a voltage corresponding to the final anode voltage of the electron gun (+400V) and the voltage applied to the output side is 1kV greater.
  • the voltage applied to the electron on the fluorescent screen is of the order of 10kV higher than that applied to the output side of the electron multiplier 26.
  • the electrodes 30 of the electrode array 28 are at 0V so that the electron beam 38 enters a repelling field causing it to be deflected towards the nearer edge of the fluorescent screen.
  • the electrode 30 nearest the electron gun 36 its voltage is increased substantially linearly to +400V so that a field free space is produced through which the trajectory of the electron beam 38 passes substantially undisturbed until it reaches the repelling field which causes it to be deflected towards the electron multiplier 26.
  • the voltage of one of the electrodes 30 is approximately half the final voltage that is +400V in this example, then the voltage applied to the next electrode 30 in the array 28 is increased at the same rate and so on.
  • the externally mounted scan coils 42 are replaced by internally arranged pole pieces and/or deflection coils.
  • the number of electrodes 30 in the array 28 is a compromise between the acceptable thickness of the tube and the number of the frame scan voltage generators required.
  • the tube thickness could be reduced to 25mm if twenty-one electrodes were used or alternatively if the number of electrodes is of the order of seven then the thickness would be of the order of 40mm.
  • a coloured display for datagraphic and instrumentation purposes then this can be achieved by making the fluorescent screen - 24 from a penetron phosphor. Different colours are produced by suitably varying the voltage applied to the transparent electrode on the faceplate 20, the voltage on the output side of the electron multiplier 26 being held constant.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP85200213A 1984-02-29 1985-02-20 Flache Kathodenstrahlröhre Expired EP0153784B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08405231A GB2155237A (en) 1984-02-29 1984-02-29 Display apparatus including a flat cathode ray tube
GB8405231 1984-02-29

Publications (2)

Publication Number Publication Date
EP0153784A1 true EP0153784A1 (de) 1985-09-04
EP0153784B1 EP0153784B1 (de) 1988-08-17

Family

ID=10557326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200213A Expired EP0153784B1 (de) 1984-02-29 1985-02-20 Flache Kathodenstrahlröhre

Country Status (5)

Country Link
EP (1) EP0153784B1 (de)
JP (1) JPS60207234A (de)
DE (1) DE3564512D1 (de)
ES (1) ES540697A0 (de)
GB (1) GB2155237A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234604A3 (de) * 1986-01-30 1989-08-30 Philips Electronics Uk Limited Bildwiedergabevorrichtung mit Kathodenstrahlröhre

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6282557U (de) * 1985-11-12 1987-05-26
JPS6358454U (de) * 1986-10-01 1988-04-19

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB739496A (en) * 1952-09-15 1955-11-02 Nat Res Dev Improvements in or relating to cathode ray tubes
DE3105310A1 (de) * 1980-02-15 1981-12-03 Sony Corp., Tokyo Kathodenstrahlroehre
EP0107217A1 (de) * 1982-09-17 1984-05-02 Philips Electronics Uk Limited Bildwiedergabevorrichtung und Flachröhre dafür

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176652A (en) * 1981-04-23 1982-10-30 Sony Corp Thin cathode-ray tube
GB2101396B (en) * 1981-07-08 1985-05-22 Philips Electronic Associated Flat display tube
GB2110465A (en) * 1981-11-09 1983-06-15 Philips Electronic Associated Flat panel display tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB739496A (en) * 1952-09-15 1955-11-02 Nat Res Dev Improvements in or relating to cathode ray tubes
DE3105310A1 (de) * 1980-02-15 1981-12-03 Sony Corp., Tokyo Kathodenstrahlroehre
EP0107217A1 (de) * 1982-09-17 1984-05-02 Philips Electronics Uk Limited Bildwiedergabevorrichtung und Flachröhre dafür

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC ENGINEERING, vol. 55, January 1983, London "Towards the thin CRT" pages 9-10 *Page9, column4 - page 10, column 5 * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234604A3 (de) * 1986-01-30 1989-08-30 Philips Electronics Uk Limited Bildwiedergabevorrichtung mit Kathodenstrahlröhre

Also Published As

Publication number Publication date
ES8603661A1 (es) 1985-12-16
GB8405231D0 (en) 1984-04-04
DE3564512D1 (en) 1988-09-22
GB2155237A (en) 1985-09-18
ES540697A0 (es) 1985-12-16
JPS60207234A (ja) 1985-10-18
EP0153784B1 (de) 1988-08-17

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