EP0286911A1 - Flache Bildwiedergabevorrichtung - Google Patents

Flache Bildwiedergabevorrichtung Download PDF

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Publication number
EP0286911A1
EP0286911A1 EP19880105138 EP88105138A EP0286911A1 EP 0286911 A1 EP0286911 A1 EP 0286911A1 EP 19880105138 EP19880105138 EP 19880105138 EP 88105138 A EP88105138 A EP 88105138A EP 0286911 A1 EP0286911 A1 EP 0286911A1
Authority
EP
European Patent Office
Prior art keywords
wires
display device
image display
flat image
heating
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.)
Withdrawn
Application number
EP19880105138
Other languages
German (de)
English (en)
French (fr)
Inventor
Uwe Mayer
Stefan Speh
Kurt-Manfred Tischer
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.)
Nokia Deutschland GmbH
Original Assignee
Nokia Graetz GmbH
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 Nokia Graetz GmbH filed Critical Nokia Graetz GmbH
Publication of EP0286911A1 publication Critical patent/EP0286911A1/de
Withdrawn legal-status Critical Current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
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources

Definitions

  • the invention relates to a flat image display device according to the preamble of patent claim 1.
  • the invention has for its object a stable structure for a flat image display device which is easy to manufacture at the same time.
  • the invention is also based on the object of specifying a method for operating the flat image display device.
  • the first object is achieved with the means specified in claim 1.
  • Advantageous refinements are contained in subclaims 2 to 11.
  • the second object is achieved by the means specified in claim 12.
  • Advantageous refinements are contained in subclaims 13 and 14.
  • FIG. 1 the flat image display device closed under vacuum is shown in a horizontal section.
  • the front plate 1 forms with the tub 2 arranged on its rear side a closed housing, which is evacuated.
  • the tub 2 has a circumferential flange 11, between which and the front plate 1 of the frame 12 is arranged.
  • the frame 12 is connected to the front plate 1 and the flange 11, for example by glass solder 13.
  • the frame 12 carries the wires 4.1 to 4.n acting as a control arrangement 4.
  • the tension anode 5 rests on the flange 11, which will be explained in more detail later with reference to FIG. 4.
  • the frame-like carrier 14 which carries the segmented counterelectrode 6 on its side facing the bottom of the tub 2.
  • the heating wire 7, focusing wire 8, pull wire 9 and shaped wire 10 are held by two opposing insulating disks 14.1 and 14.2 (FIG. 2) of the carrier.
  • the support 14 is connected to the bottom of the trough 2 via the holding members 15 (not shown).
  • a bushing 28 is provided in a side wall of the tub 2. These lead the electrical connections of the counter electrode and the wires to the outside. With 29 a schematically represented connection is designated.
  • the wires 4.1 to 4.n of the control arrangement 4 run parallel to one another and perpendicular to the rows of the fluorescent screen 3.
  • the segments of the counterelectrode 6 and the heating 7, focusing 8 pulling 9 and shaped wires 10 all run parallel to one another and parallel to the Lines of the fluorescent screen 3.
  • the carrier 14 consisting of the disks 14.1 and 14.2 and the holding members 15.
  • the insulating disks 14.1 and 14.2 are made of ceramic, in particular of electrical ceramic, e.g. the type Stealan from Sembach, Lauf, Germany.
  • the heating wires 7, focusing wires 8, pulling wires 9 and shaped wires 10 are later inserted into these incisions 17 and 16, respectively. 2, the later position of these wires is indicated approximately in the middle of the disks 14.1 and 14.2.
  • the lower longitudinal sides of the disks 14.1 and 14.2 in FIG. 2 carry lugs 18.
  • the segments of the counterelectrode 6 are attached to the disks 14.1 and 14.2 between these lugs 18.
  • a segment 6.5 of the counter electrode is shown in FIG. 2.
  • the holding members 15 can, as indicated, consist of disks, but rods or similar components can also be used.
  • the holding members 15 have the task of holding the disks 14.1 and 14.2 at a predetermined distance and to give the support 14 stability against twisting.
  • contact strips 19 which serve to supply voltage to the wires and on which the wires are suspended via springs.
  • the uppermost contact strip in FIG. 2 is connected to the odd-numbered and the next contact strip to the respective even-numbered shaped wires 10.
  • the middle contact strip connects all of the puller wires 9 to one another.
  • All focusing wires 8 are connected to the penultimate contact strip and the bottom contact strip connects all the heating wires to one another.
  • Fig. 3 details are shown in a sectional view through part of a disc 14.1.
  • the contact strips 19 are fastened to the disk 14.1, for example, by pins 21 connected to them.
  • Springs 20 are welded to the contact strips, the free ends of which are connected to the wires.
  • the springs 20 consist of an electrically conductive material and on the one hand the electrical connection of the wires and the maintenance of a mechanical tension in the wires is ensured.
  • the pull anode 5 is shown in a plan view.
  • the pull anode has a perforated surface 22 surrounded by an edge 23.
  • the size of the surface 22 corresponds approximately to the surface of the fluorescent screen 3.
  • the holes 24 in the surface 22 are honeycomb-shaped. A part of the holes 24 is drawn out enlarged in the middle of the surface 22 in order to clearly show the honeycomb shape.
  • the honeycomb shape of the holes 24 results in a pull anode with great stability and at the same time higher transparency values between 30 and 95% can be achieved, e.g. 90% transparency if 25 0.04 mm is selected for the width of the webs and 0.427 mm for the length of the sides.
  • the pull anode 5 is placed on the flange 11 of the tub 2 without any special adjustment and is inserted via the glass solder 13. Due to the increased temperature during the frying process, the pulling anode 5 expands and is therefore in a tensioned state in the image display device after cooling to room temperature.
  • the frame 12 shows the frame 12 carrying the control arrangement 4 in a perspective view.
  • the frame is made of ceramic, in particular Electroceramic, for example the Stealan type from Sembach, Lauf.
  • the frame 12 can be formed in one piece or can be composed of four bars 26, as shown in FIG. 5.
  • the frame 12 carries the wires 4.1 to 4.n of the control arrangement 4.
  • the wires 4.1 to 4.n can be applied to the frame in such a way that a wire is continuously wound around the frame. After the winding process, the wire on the narrow sides of the rods 26 is cut and the wires on one side are removed.
  • a winding form can also be used, into which the frame 12 is inserted at the end.
  • two frames can also be placed on top of one another and then wrapped. After separating the wires on the narrow sides of the rods 26, two frames with the wires 4.1 to 4.n are obtained without any wire waste.
  • the wires 4.1 to 4.n are connected to the frame 12, for example, by a fritting process.
  • the increased temperature during the frying process results in an increase in the length of the wires, which leads to a mechanical pretension in the wires at room temperature.
  • the number n of wires is e.g. equal to the number of pixels in a line plus 1.
  • FIG. 6 shows part of the flat image display device in a vertical section. The operation of the image display device is to be explained on the basis of this illustration.
  • the heating wires 7 are energized only for the time of the line return by applying a heating voltage and then emit electrons in the time of the line supply.
  • the heating wires 7 can also be energized only during the image change time.
  • a positive voltage is in the range of 150 to 500 volts on the pulling wires 9, as a result of which the electrons are accelerated in the direction of the pulling wires 9.
  • the cloud of electrons emerging from the heating wires 7 is shaped, as shown in FIG. 6 on the rightmost heating wire.
  • the shaped wires 10 are subjected to a voltage which is negative with respect to the voltage on the pulling wires 9 and can be, for example, -40 volts.
  • a voltage which is negative with respect to the voltage on the pulling wires 9 and can be, for example, -40 volts.
  • At the subsequent pull anode 5 there is a positive voltage in the range of 5 to 40 volts, so that a certain braking field is built up and the electrons have a low speed when passing through the holes of the pull anode 5.
  • a voltage in the range from 12 to 18 kV is present at the fluorescent screen 3.
  • the sheet-shaped electron beam 27 passes through the control arrangement 4 after passing through the holes of the pulling anode 5 and then strikes the pixels located in one line of the fluorescent screen 3.
  • the brightness modulation of the individual pixels in this line is carried out by the pulse duration modulated voltage applied to the wires 4.1 to 4.n of the control arrangement 4.
  • a deflection voltage is applied to each of two shaped wires 10 assigned to a heating wire 7, which voltage changes in such a way that the leaf-shaped electron beam 27 successively hits successive lines.
  • all of the heating wires 7 are supplied with current together, as indicated, but electrons are always only extracted from one heating wire to form the sheet-like electron beam.
  • electrons are removed from the heating wire assigned to the upper edge of the picture and the sheet-like electron beam is directed one after the other onto successive lines.
  • the last line of the area supplied by this electron beam is reached, the electron emission from this heating wire is suppressed.
  • electrons are removed from the subsequent heating wire to form the next sheet-like electron beam.
  • This leaf-shaped electron beam is also deflected from line to line until the last line of its area is reached. This switching takes place up to the last electrical heating wire assigned to the lower edge of the picture.
  • FIG. 6 shows how electrons are extracted from the associated fifth heating wire to form the sheet-like electron beam 27 in order to illuminate the lines in the fifth region of the fluorescent screen 3.
  • a negative voltage of 50 volts is applied to each of the segments 6.1 to 6.4 and the segment 6.6.
  • a voltage of 0 volts is present on segment 6.5.
  • the leaf-shaped electron beam 27 is formed only in this area, which impinges on the first line Z1 of the fluorescent screen 3 in this area due to the deflection voltage applied to the shaped wires 10.
  • the associated pixels in the relevant line of the fluorescent screen 3 are bombarded with electrons or the electrons are deflected back to the pulling anode 5.
  • the duration of the positive voltage applied to two adjacent wires belonging to one pixel determines the brightness of the pixel in question.
  • the electron beam 27 is directed onto the line Z2 by changing the deflection voltage on the shaped wires 10.
  • the electron beam 27 is switched on until it hits line Z8 (shown in dashed lines).
  • the negative voltage of 50 volts required to block the removal of electrons is applied to segment 6.5 of the counter electrode 6 and the subsequent segment 6.6 of the counter electrode 6 is raised to 0 volts.
  • Now 3 electrons are removed from the associated heating wire in the sixth area of the fluorescent screen and a sheet-like electron beam is formed, which is deflected from row to row in this area as described.
  • the two shaped wires 10 belonging to one heating wire 7 are connected in parallel with the two respective forming wires 10 belonging to the other heating wires 7. These twelve electrical connections are routed through the trough 2 to the outside in the usual way by means of the bushing 28.
  • the voltage for the pull anode 5 is supplied via its edge 23 accessible on the flange 11 of the tub 2.
  • the wires 4.1 to 4.n of the control arrangement 4 are accessible at the edge of the frame 12 and can be connected from here to the associated control electronics.
  • the heating wires can also be energized individually and independently of one another. It is therefore possible to energize only those heating wires during the line return time that are not currently being used to form the sheet-like electron beam.
  • a voltage of -50 volts is present at the associated segments of the counter electrode. To this In this way it is achieved that there is a constant potential along the heating wire causing the sheet-like electron beam.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP19880105138 1987-04-04 1988-03-30 Flache Bildwiedergabevorrichtung Withdrawn EP0286911A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3711391 1987-04-04
DE19873711391 DE3711391A1 (de) 1987-04-04 1987-04-04 Flache bildwiedergabevorrichtung

Publications (1)

Publication Number Publication Date
EP0286911A1 true EP0286911A1 (de) 1988-10-19

Family

ID=6324875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880105138 Withdrawn EP0286911A1 (de) 1987-04-04 1988-03-30 Flache Bildwiedergabevorrichtung

Country Status (3)

Country Link
EP (1) EP0286911A1 (enrdf_load_stackoverflow)
JP (1) JPS6448359A (enrdf_load_stackoverflow)
DE (1) DE3711391A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0366055A3 (en) * 1988-10-26 1990-06-13 Matsushita Electric Industrial Co., Ltd. Video display device
EP0374572A3 (de) * 1988-12-22 1991-07-10 Nokia (Deutschland) GmbH Kathoden/Steueranordnung für eine Flachbildröhre und Rahmen für eine solche Anordnung
EP0987732A3 (en) * 1998-08-21 2002-09-11 Pixtech, Inc. Display device with improved grid structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5256937A (en) * 1989-04-07 1993-10-26 Nokia (Deutschland) Gmbh Flat panel fluorescent screen display tube
DE3911343A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Flache anzeigeeinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3119442A1 (de) * 1981-05-15 1982-12-09 Siemens AG, 1000 Berlin und 8000 München Flache bildwiedergaberoehre
DE3335598A1 (de) * 1983-09-30 1985-04-18 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung einer elektrodenplatte, danach hergestellte elektrodenplatte und ihre verwendung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3119442A1 (de) * 1981-05-15 1982-12-09 Siemens AG, 1000 Berlin und 8000 München Flache bildwiedergaberoehre
DE3335598A1 (de) * 1983-09-30 1985-04-18 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung einer elektrodenplatte, danach hergestellte elektrodenplatte und ihre verwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Funkschau, Heft 10, Mai 1980, Munchen G. TROLLER "Der Flache Bildschrim" seiten 63-66 * seiten 64, spalte 2, zeile 18 - spalte 3, zeile 38 * *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0366055A3 (en) * 1988-10-26 1990-06-13 Matsushita Electric Industrial Co., Ltd. Video display device
US4982134A (en) * 1988-10-26 1991-01-01 Matsushita Electric Industrial Co., Ltd. Video display device
EP0374572A3 (de) * 1988-12-22 1991-07-10 Nokia (Deutschland) GmbH Kathoden/Steueranordnung für eine Flachbildröhre und Rahmen für eine solche Anordnung
EP0987732A3 (en) * 1998-08-21 2002-09-11 Pixtech, Inc. Display device with improved grid structure

Also Published As

Publication number Publication date
DE3711391A1 (de) 1988-10-20
JPS6448359A (en) 1989-02-22
JPH0468736B2 (enrdf_load_stackoverflow) 1992-11-04

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