EP0206880B1 - Verfahren und Vorrichtung zur Beleuchtung einer Farbfernsehrohrplatte zur Bildung eines Schirms - Google Patents

Verfahren und Vorrichtung zur Beleuchtung einer Farbfernsehrohrplatte zur Bildung eines Schirms Download PDF

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Publication number
EP0206880B1
EP0206880B1 EP86401187A EP86401187A EP0206880B1 EP 0206880 B1 EP0206880 B1 EP 0206880B1 EP 86401187 A EP86401187 A EP 86401187A EP 86401187 A EP86401187 A EP 86401187A EP 0206880 B1 EP0206880 B1 EP 0206880B1
Authority
EP
European Patent Office
Prior art keywords
screen
light
pencil
deflector
center
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.)
Expired
Application number
EP86401187A
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English (en)
French (fr)
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EP0206880A1 (de
Inventor
Pierluigi Testa
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.)
Videocolor SA
Original Assignee
Videocolor SA
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 Videocolor SA filed Critical Videocolor SA
Publication of EP0206880A1 publication Critical patent/EP0206880A1/de
Application granted granted Critical
Publication of EP0206880B1 publication Critical patent/EP0206880B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses

Definitions

  • the invention relates to a method and an apparatus for illuminating a photosensitive material arranged on a panel for forming the cathodo-luminescent screen of a color television tube of the perforated mask type.
  • a color television tube has a front panel on the internal surface of which the screen is deposited, which is usually formed by vertical bands of emitting cathodo-luminescent material, when they are excited by an electron beam produced by a cannon. electron, red, green or blue light.
  • the screen thus comprises a succession of sets of three vertical bands, each set having a red band, a green band and a blue band. Each color is excited by a corresponding electron beam.
  • a matrix two neighboring bands of phosphors are separated by a black band of graphite, which makes it possible to obtain an image of improved contrast.
  • a mask tube for the selection of colors, that is to say so that the beam intended for a color, for example blue, strikes only the phosphor of this color (blue), provision is made in front of the screen a shadow mask whose position and arrangement of the slots ensures said selection.
  • each of the luminescent substances is deposited in the following manner: the internal face of the panel is covered with a solution of this substance in a photosensitive material which hardens when it is illuminated by ultraviolet (UV) radiation, then it is illuminated through the mask this solution covering the internal face of the slab by an optical system which comprises a source of UV radiation and an objective simulating the deflector of the tube.
  • the position of the optical system, in particular of the UV lamp depends on the color of the phosphor in solution. In this way only the photosensitive material located at the locations provided for the determined color is illuminated and can therefore harden. The material in the other locations does not harden or settle on the glass; it can be cleaned by washing with water or using another liquid.
  • the UV source emitting a radiation whose intensity is not constant as a function of the direction of emission, between this source and the screen there is a filter which compensates for this lack of uniformity so that the intensity of the radiation reaching the screen is substantially constant on the surface of the latter; indeed, if it were not so, the surface area of the hardened locations would not be constant.
  • the mask is formed of slots arranged in succession along vertical lines while it is desired to form on the screen continuous vertical lines. Without particular precautions, we would therefore obtain on the screen broken lines of phosphors and graphite. To avoid this defect, during illumination the lighting apparatus is moved in a vertical direction.
  • a special lighting device For the manufacture of each type and size of color television tube, a special lighting device must be provided. In other words, an appliance intended for a given type and dimension cannot be used for another dimension or another type. In addition, the exposure times are relatively long.
  • Document DE-A 3,035,367 also discloses an apparatus for illuminating light-curable photosensitive material for manufacturing the screen of a color cathode ray tube of the perforated mask type, this apparatus comprising a laser emitting a light brush and a deflector to deflect this brush so that it scans the screen in front of which the shadow mask is placed.
  • the light brush of this device has a constant intensity regardless of the direction, but compensation must be made because the intersection section of the light brush by the screen is not the even from one point to another on this screen; this section is greater at the edges than at the center and, therefore, the energy density received per unit area is lower at the edges than at the center.
  • This drawback is remedied by modulating the intensity of the light brush so that the light intensity received by each point of the screen is substantially constant.
  • the light modulator is controlled so that the intensity is lower in the center than at the edges.
  • the light modulator has a role analogous to the role played by the filter of the prior art illumination apparatus, that is to say that it is controlled in such a way that at each point of the screen the quantity of light energy received per unit area is constant.
  • the exposure time is of a low value, which reduces the manufacturing time.
  • the programmable device also controls the movement of the center of deflection.
  • This displacement when carried out parallel to the lines of the screen, makes it possible to pass from the illumination of a strip of determined color to a strip of another color.
  • a displacement of this center parallel to the vertical bands of the screen ensures the continuity of the bands of phosphors and possibly of the black bands.
  • a displacement of the center of deflection perpendicular to the screen makes it possible to adapt the lighting apparatus to the manufacture of other types or other dimensions of tubes.
  • FIG. 1 is a diagram representing an apparatus according to the invention, as well as the slab -screen and mask of a color display tube, in particular a television receiver tube.
  • This device 12 is used to illuminate, in vertical bands 13 1 , 13 2 ... 13 n ..., the internal face of the slab 10 which is covered over its entire surface with a solution of a colored phosphor determined - or graphite - in a photosensitive material.
  • This illumination hardens the photosensitive material on these strips; in this way, the hardened material remains, with the phosphor or the graphite that it contains, on the glass while the uncured material, that is to say that which has not been illuminated, can be removed by washing .
  • the illumination is carried out through the holes 14 of the mask 11 which are constituted by vertically elongated slots and arranged according to columns of vertical axis 15 1 ... 15 n ...
  • the role of the shadow mask 11 is to obscure each of the electron beams so that the beam intended to excite the phosphors of one color does not excite the phosphors of another color. This is why this mask 11 has a position determined very precisely with respect to the screen 10, and, therefore, the screen is formed from the holes in the mask.
  • the illumination device 12 comprises, in the example, a light source constituted here by a laser 16 emitting ultra-violet radiation capable of hardening the photosensitive materials placed on the screen 10.
  • the beam 17 of coherent light coming out of the laser 16 may have an intensity which is not necessarily constant at all points in its section, provision is made for an assembly 18 making it possible to diaphragm this beam 17 to produce a beam 19 of more uniform intensity over its section .
  • the assembly 18 comprises a focusing lens 20, a diaphragm 21, the opening of which is at the focal point of the lens 20, and a lens 22, the object focus of which is at the location of the opening of the diaphragm 21.
  • the assembly 18 thus retains only the central part of the laser beam and it increases the section of this central part.
  • the beam 19 enters a light modulator 23 controlled by an electrical signal, applied to a corresponding input 24, which is provided by an interface 25 between the input 24 of the modulator 23 and the output 26 of a computer 27.
  • the interface 25 comprises a two-way switching circuit and, for each channel, a digital-analog converter and an amplifier of the converter output signals.
  • the interface 25 has a second output which delivers a signal to the input 28 for controlling a deflector 29 for the light brush 30 exiting from the light modulator 23.
  • the deflector 29 deflects the beam 30 by refraction and / or reflection so as to produce an output beam 31 which scans the entire surface of the screen 10.
  • the displacement is for example carried out column by column, that is to say that the beam 31 first moves in a first vertical plane, that of the strip 13 1 ; then it is moved to scan column 13 2 , etc ...
  • the deflection center 32 of the deflector 29 is also movable in a horizontal direction perpendicular to the beam 30, in the direction of the arrows 35, parallel to the lines of the screen, to pass from the illumination of the locations of a color to the illumination locations of another color or black bands.
  • the deflection center 32 is movable perpendicular to the screen, that is to say in the direction (arrows 34) of the beams 17, 19 and 30, in particular to allow the adaptation of the device 12 to another type of tube to be manufactured.
  • the light modulator 23 is constituted by a Kerr effect cell or by a Pockels effect cell or by a Faraday effect cell.
  • a Kerr effect cell or by a Pockels effect cell or by a Faraday effect cell.
  • the deflector 29 is for example an acousto-optical deflector with Brillouin effect or a mechanical deflector or an electro-optical deflector, for example with Pockels effect. Details of these deflectors are also found in the work cited above.
  • deflector 29 it is possible to combine an electro-acoustic means, to carry out a sweeping with the stationary deflection center 32, with a means of the mechanical type which moves this deflector so as to displace the deflection center 32. It is also possible use a rotating mirror means secured to a support rotating along another axis as described in German patent application 3,035,367.
  • the computer 27 is programmed to deliver in succession on its output 26 appropriate control signals at each instant for the modulator 23 and for the deflector 29.
  • the output 26 of the computer delivers a signal applied to the input 24 of the modulator 23 which represents an amplitude of attenuation of the beam 19 and of the signals, transmitted on the input 28, which represent the position of the center of deflection 32, the position of the scanning plane in which the pin must be located ceau 31 and the angle formed by this brush 31 with a reference direction in this plane.
  • the light source is constituted by a laser, it should be noted that this can also be constituted by an incoherent light source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (15)

1. Gerät zum Beleuchten eines lichthärtbaren und lichtempfindlichen - Stoffes für die Herstellung des Bildschirmes (10) einer Farbkathodenstrahlröhre vom Typ mit Lochmaske (11), wobei dieses Gerät eine ein Lichtbündel (19) aussendende Lichtquelle (16, 18) sowie einen Deflektor (29) umfaßt, um dieses Bündel abzulenken, damit es den Bildschirm (10), vor welchem die Lochmaske angeordnet ist, abtastet, dadurch gekennzeichnet, daß es einen Lichtmodulator (23) umfaßt, der von einem Rechner (27) gesteuert wird, damit die von jedem Punkt des Bildschirmes empfangene Lichtintensität im wesentlichen konstant bleibt.
2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Lichtmodulator (23) zwischen der Lichtquelle und dem Deflektor (29) liegt.
3. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Lichtmodulator (23) vom opto-elektrischen oder vom opto-magnetischen Typ ist.
4. Gerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Rechner (27) auch den Deflektor (29) steuert.
5. Gerät nach Anspruch 4, dadurch gekennzeichnet, daß das Ablenkzentrum (32) in dem Deflektor (29) unter der Steuerung des Rechners (27) parallel (35) zu den Zeilen des Bildschirmes verschiebbar ist, um von der Beleuchtung der Leuchtstoffstellen einer Farbe zu der Beleuchtung der Leuchtstoffstellen einer anderen Farbe oder von schwarzen Streifen zwischen Leuchtstoffen überzugehen.
6. Gerät nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß das Ablenkzentrum (32) in einer zu den Spalten (13) der Leuchtstoffe auf dem Bildschirm (10) parallelen Richtung (36) senkrecht verschiebbar ist, um die Beleuchtung jedes Punktes einer solchen Spalte (13) zu ermöglichen, trotz der Abstände (33) zwischen den einander benachbarten Schlitzen (14) der Maske.
7. Gerät nach Anspruch 6, dadurch gekennzeichnet, daß die Steuerung durch den Rechner (27) so erfogt, daß das Ablenkzentrum (32) unbewegt bleibt, wenn das Bündel (31) eine Spalte (13) auf der ganzen Höhe des Bildschirmes abtastet, woraufhin dieses Ablenkzentrum (32) entlang dieser zu einer Spalte parallelen senkrechten Richtung bewegt wird, damit die Punkte dieser Spalte, welche durch die bestehenden Abstände (33) zwischen den Schlitzen der Maske verdunkelt worden sind, während dieser zweiten Abtastung derselben Spalte beleuchtet werden.
8. Gerät nach Anspruch 6, dadurch gekennzeichnet, daß der Rechner (27) die Verschiebung des Ablenkzentrums (32) so steuert, daß dieses bei der Abtastung der verschiedenen Spalten (13). des Bildschirmes (10) unbeweglich bleibt und sich dann bewegt, um eine zweite Abtastung aller Spalten durchzuführen, wobei die Verschiebung so ist, daß die Spaltenstellen, die während der ersten Abtastung von den Abständen (33) zwischen einander benachbarten Schlitzen der Maske verdunkelt worden sind, bei dieser zweiten Abtastung beleuchtet werden.
9. Gerät nach Anspruch 4, dadurch gekennzeichnet, daß das Ablenkzentrum (32) des Deflektors (29) unter der Steuerung des Rechners (27) entlang der zu dem Bildschirm senkrechten Richtung (34) verschiebbar ist, um die Verwendung dieses Gerätes für die Bildschirmherstellung verschiedener Röhrentypen zu ermöglichen.
10. Gerät nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Deflektor (29) vom Elektroakustischen Typ ist.
11. Gerät nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet daß die Lichtquelle einen eine UV-Strahlung aussendenden Laser (16) umfaßt.
12. Gerät nach Anspruch 11, dadurch gekennzeichnet, daß es eine Vorrichtung (18), mit Blende umfaßt, so daß nur der Hauptstrahl des Laserbündels durch den Deflektor (29) abgelenkt wird.
13. Gerät nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Steuerung des Lichtmodulators (23) durch den Rechner (27) derart ist, daß sie die Schwankung des Flächeninhalts der Schnittfläche des Lichtbündels durch den Bildschirm von einem Punkt zu einem anderen Punkt dieses Bildschirmes ausgleicht.
14. Verfahren zum Beleuchten eines lichthärtbaren und lichtempfindlichen Materials für die Herstellung des Bildschirmes (10) einer Farbkathodenstrahlröhre vom Typ mit Lochmaske (11), in welcher ein Lichtbündel (19) abgelenkt wird, um den Bildschirm, vor welchem die Lochmaske angeordnet ist, abzutasten, dadurch gekennzeichnet, daß die Intensität des Lichtbündels so moduliert wird, daß die von jedem Punkt des Bildschirmes empfangene Lichtintensität im wesentlichen konstant bleibt.
15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, daß bei Konstanz der Intensität des Lichtbündels unabhängig von der Richtung die Modulation dieses Bündels den Ausgleich der Schwankung des Flächeninhalts der Schnittfläche dieses Bündels durch den Bildschirm von einem Punkt zu einem anderen Punkt dieses Bildschirmes gewährleistet.
EP86401187A 1985-06-04 1986-06-03 Verfahren und Vorrichtung zur Beleuchtung einer Farbfernsehrohrplatte zur Bildung eines Schirms Expired EP0206880B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508396A FR2582858B1 (fr) 1985-06-04 1985-06-04 Procede et appareil d'illumination de la dalle d'un tube de television en couleurs pour la formation de l'ecran
FR8508396 1985-06-04

Publications (2)

Publication Number Publication Date
EP0206880A1 EP0206880A1 (de) 1986-12-30
EP0206880B1 true EP0206880B1 (de) 1989-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401187A Expired EP0206880B1 (de) 1985-06-04 1986-06-03 Verfahren und Vorrichtung zur Beleuchtung einer Farbfernsehrohrplatte zur Bildung eines Schirms

Country Status (9)

Country Link
US (1) US4707093A (de)
EP (1) EP0206880B1 (de)
JP (1) JP2596897B2 (de)
CA (1) CA1248578A (de)
DE (1) DE3662575D1 (de)
FR (1) FR2582858B1 (de)
HK (1) HK102590A (de)
IN (1) IN166455B (de)
SG (1) SG77790G (de)

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KR20010033753A (ko) * 1998-11-02 2001-04-25 요트.게.아. 롤페즈 음극선관을 위한 레이저 조명 장치
US7791561B2 (en) 2005-04-01 2010-09-07 Prysm, Inc. Display systems having screens with optical fluorescent materials
US7733310B2 (en) 2005-04-01 2010-06-08 Prysm, Inc. Display screens having optical fluorescent materials
US7474286B2 (en) 2005-04-01 2009-01-06 Spudnik, Inc. Laser displays using UV-excitable phosphors emitting visible colored light
US7994702B2 (en) 2005-04-27 2011-08-09 Prysm, Inc. Scanning beams displays based on light-emitting screens having phosphors
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US8089425B2 (en) 2006-03-03 2012-01-03 Prysm, Inc. Optical designs for scanning beam display systems using fluorescent screens
US7884816B2 (en) 2006-02-15 2011-02-08 Prysm, Inc. Correcting pyramidal error of polygon scanner in scanning beam display systems
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US9525850B2 (en) * 2007-03-20 2016-12-20 Prysm, Inc. Delivering and displaying advertisement or other application data to display systems
US8169454B1 (en) 2007-04-06 2012-05-01 Prysm, Inc. Patterning a surface using pre-objective and post-objective raster scanning systems
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WO2008144673A2 (en) 2007-05-17 2008-11-27 Spudnik, Inc. Multilayered screens with light-emitting stripes for scanning beam display systems
US7878657B2 (en) 2007-06-27 2011-02-01 Prysm, Inc. Servo feedback control based on invisible scanning servo beam in scanning beam display systems with light-emitting screens
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Also Published As

Publication number Publication date
JP2596897B2 (ja) 1997-04-02
SG77790G (en) 1991-01-18
HK102590A (en) 1990-12-14
US4707093A (en) 1987-11-17
EP0206880A1 (de) 1986-12-30
CA1248578A (fr) 1989-01-10
FR2582858A1 (fr) 1986-12-05
FR2582858B1 (fr) 1988-11-10
DE3662575D1 (en) 1989-04-27
JPS622428A (ja) 1987-01-08
IN166455B (de) 1990-05-12

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