EP0638921A1 - Dispositif de faisceau in-line pour tubes images - Google Patents

Dispositif de faisceau in-line pour tubes images Download PDF

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Publication number
EP0638921A1
EP0638921A1 EP94111104A EP94111104A EP0638921A1 EP 0638921 A1 EP0638921 A1 EP 0638921A1 EP 94111104 A EP94111104 A EP 94111104A EP 94111104 A EP94111104 A EP 94111104A EP 0638921 A1 EP0638921 A1 EP 0638921A1
Authority
EP
European Patent Office
Prior art keywords
grid
voltage
distance
convergence
grating
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Withdrawn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
EP94111104A
Other languages
German (de)
English (en)
Inventor
Dr. Gerard Hörsch
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 Technology GmbH
Original Assignee
Nokia Technology 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
Priority claimed from DE4330370A external-priority patent/DE4330370A1/de
Application filed by Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0638921A1 publication Critical patent/EP0638921A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes

Definitions

  • the invention is concerned with an in-line beam system for picture tubes, in particular one which is suitable for eliminating the grid 3 convergence and upon deflection of the electron beams in the 9 ° and 3 ° range of the screen to produce this vertical bar largely homogenized in the stripe width.
  • In-line beam systems are usually formed by a cathode arrangement and a grid arrangement upstream of this cathode arrangement in the direction of the screen.
  • the cathode arrangement comprises three cathodes arranged next to one another and arranged in one plane.
  • the grid arrangement upstream of the cathode arrangement in the direction of the screen is usually formed by four grid electrodes spaced apart from one another.
  • the grid closest to the cathode arrangement is called grid 1 or control grid.
  • the grid 2 which is also called the screen grid, connects to the grid 1 in the direction of the screen.
  • the combination of cathode, control grid and screen grid forms the so-called triode lens.
  • Grid 2 the grid 3 electrode, which consists of four cup-shaped electrodes, two of which are each connected to their free edge and thereby form a cup-shaped electrode.
  • the next electrode to the screen is the 4-electrode grid.
  • the grid 3 and grid 4 electrodes form the focusing lens of the system.
  • each electrode has three openings arranged next to one another, arranged in one plane and aligned with the cathodes, through which the electrons emitted by the cathodes pass in the direction of the screen.
  • the openings in the grids 1 to 4 which are located in front of the central cathode, are aligned centrally to the tube axis.
  • the openings in the grids 1 to 4 through which the electron beams emitted by the respective outer cathode pass, are — as explained in more detail below — also aligned with the central grid openings.
  • the s distances in the grids 1 to 3 are chosen to be the same size.
  • the electron beams, which are emitted by the two outer cathodes have the same distance from the middle one, at least according to theoretical considerations, on their way through the grids 1 to 3 Electron beam.
  • the s-spacing which is predominant between the central opening and the respective outer opening in grating 4, is greater than the s-spacing between the center openings and the outer openings of grating 1 to 3. This causes that at the transition of the two outer rays of grating 3 in grid 4 these are broken.
  • the result is that the two outer beams are brought to convergence with the center beam at a point on the tube axis (Z).
  • the in-line beam system described above is used in the neck of the picture tube.
  • the cathodes and the grids are contacted via contact pins, which are melted through the glass in the neck area of the picture tube.
  • the so-called cone connects to the neck of the picture tube and then the screen.
  • the deflection arrangement is attached to the outside of the picture tube, which causes the three electron beams generated by the beam system to be deflected via the screen.
  • a self-converging deflection system is usually used for this. This is understood to mean an arrangement which ensures that the convergence points are always on the screen both when the electron beams are deflected vertically and horizontally.
  • An ideal system i.e. a system, which has no assembly errors due to manufacturing tolerances, has a focusing voltage (also called grid 3 voltage) at a certain anode voltage, in which the spots on the screen are optimally focused visually.
  • This focus voltage is called the optimal focus voltage and is used for a large number of tubes of this type of tube as a setting voltage for the convergence setting.
  • the optimal focus voltage is approx. 25 to 35% of the anode voltage.
  • the convergence of the picture tube is set by magnetizing internal or external multipoles.
  • the anode voltage is applied to grid 4 and the optimal focus voltage which is decisive for this tube type but is only valid for a system free from structural errors.
  • the two outer beams are bent at the same angle in the direction of the center beam.
  • This weakening of the main lens effect leads to the fact that the external beams are bent less strongly in the direction of the central beam in comparison with the example in the last paragraph and thus show a convergence error in a tube which has already been set.
  • grid 3 convergence running The influence that the increase or decrease in the grid 3 voltage has on the convergence is referred to as grid 3 convergence running.
  • This grid 3 convergence run is extremely disadvantageous because it prevents a tube that is set under the effect of the optimal focus voltage that is only valid for the respective tube type, in terms of sharpness and convergence, from an optimal setting is received if the system has an assembly error. If it turns out after the convergence has been set that the respective tube is afflicted with an assembly error in the system, such an assembly error, which is unavoidable in current production, can only be reduced by modifying the grids with regard to sharpness and convergence 3 Voltage a compromise setting is made.
  • the 9 ° range of the picture tube is the edge of the screen which is closest in the x direction to the electron beam gun which produces the color blue on the screen.
  • the 3 ° -range is the edge of the picture tube which is closest to the color red in the x-direction of the electron beam gun.
  • the respective external beam of an in-line beam system which is spatially closest to the edge of the picture tube to which the horizontal deflection is performed, in comparison to a horizontal one Distraction to the other edge of the picture tube on the screen produces about 20-30% wider vertical bars.
  • registration is assumed that the external rays of the system generate the electron rays for the colors red and blue.
  • the causes of this inhomogeneity in the width of the vertical bars in the colors red and blue are largely known.
  • One cause is that a predominantly pillow-shaped magnetic field for the horizontal deflection of the electron beams increases in strength from the inside, ie from the center of the tube to the outside.
  • the electrons receive horizontal magnetic field components when deflected horizontally by this field.
  • Another reason for the different vertical bar widths of the colors red and blue is the influence of the deflection stray field. The influence of this stray field prevents the electron beams from crossing the main lens (transition from grating 3 to grating 4) in the middle.
  • the red-colored spots are strongly distorted in the horizontal direction and over-focused in the vertical direction.
  • the consequences are the wide vertical bars of the color red that have already been mentioned in this area.
  • the extent of the distortion of the red spot depends on the amount of the additional components of the pillow-shaped deflection field and on the amount of the displacement of the electron beams in the main lens by the deflection stray field.
  • the electron beam of the color blue is less distorted in the horizontal direction when deflected into the 3 ° range of the picture tube and underfocused in the vertical direction. This results in narrow vertical bars of blue in the 3 ° range.
  • the electron beams are deflected into the 9 ° range, they are The proportions of the vertical bar widths are reversed accordingly, i.e. in the 9 ° range the vertical bars of red are narrower and those of blue are wider.
  • the invention is therefore based on the object of specifying an electron gun system for picture tubes which eliminates the 3-convergence grid and produces extensively homogenized Verkialbalken for the colors red and blue in the 3 o'clock and 9 o'clock (deflection) range .
  • the s-spacing in the lower part of grid 3 is greater than the s-spacing of grid 1 and grid 2 and smaller than the s-spacing of grid 4 and that the s-spacing of the upper grid part of grid 3 is equal to the s-spacing of grid 1 and grid 2.
  • the grid 3 convergence running which occurs with the modification of the grid 3 voltage is eliminated. If the grating 3 voltage is increased, the effect of the pre-focusing lens formed between grating 2 and grating 3 lower part increases and the effect of the main lens between grating 3 upper part and grating 4 decreases. This means that compared to an unchanged grid 3 voltage, the outer rays in the area between grid 2 and grid 3 lower part stronger and weaker in the main lens. In contrast, when the grid 3 voltage is reduced, the effect of the pre-focusing lens decreases and the effect of the main lens increases.
  • the width of the vertical bars in the 3 ° and 9 ° range of the colors red and blue is largely homogenized. If the electron beams are deflected into the 3 ° range, the electron beam of the color red becomes effective the pre-focusing lens is "pre-bent" in a direction opposite to the deflection direction. A central crossing of this electron beam through the main lens can thus be achieved by superimposing the deflector stray field. This reduces the spherical aberration of the main lens and reduces the "deflection-related" influences that are otherwise responsible for the wide vertical bars in this deflection area.
  • Advantageous effects of the electron gun system set out in claim 1 can be achieved if, according to claim 2, the s-spacing of the lower part of grid 3 is increased by up to 40 ⁇ m compared to the s-spacing of grid 2.
  • An optimal grid 3 voltage (U G3opt ) is understood to be one in which the electron beams of a system free of defects on the screen are optimally focused visually. This optimal grid 3 voltage or focus voltage depends on the design and is conventionally approx. 25 -35% of the anode voltage (U A ).
  • FIG. 1 shows a picture tube 10.
  • This picture tube 10 is formed by the screen 11, the cone 12 and the neck 13.
  • an in-line beam system 14 shown in broken lines
  • a magnetic deflection system 15 is attached to the transition from the neck 13 to the cone 12. This deflection system 15 deflects the electron beams (R, G, B) over the surface of the screen 11.
  • This deflection system 15 deflects the electron beams (R, G, B) over the surface of the screen 11.
  • R ', G', B ' this is indicated schematically by the broken line. It can be clearly seen from FIG.
  • the deflection system 15 generates over its overall length L a predominantly "barrel-shaped" field line course for the vertical deflection and a predominantly "pillow-shaped" field line course for the horizontal deflection.
  • the deflection system 15 is therefore a self-converging system.
  • FIG. 2 shows a top view of an in-line jet generator system.
  • the in-line jet generator system 14 has a pressed glass plate 16, in which contact pins 17 are melted.
  • the grid electrodes 18, 19, focusing electrodes 20, 21 and the convergence pot 22 adjoin this.
  • the cathodes 23R, 23G, 23B which are shown only schematically and in broken lines, are arranged within the grid electrodes.
  • the control grid electrode 18 is the Grid electrode 1 and the screen grid electrode 19 the grid electrode 2.
  • the focusing electrodes 20, 21 form the focusing lens.
  • the individual parts of the in-line beam generator system 14 are held together by two glass rods 24.
  • the focusing electrode 20, which is also called a grating 3, consists of four cup-shaped electrodes 20.1 to 20.4, of which two electrodes are connected to one another by their free edge and thereby form a cup-shaped electrode.
  • three openings are arranged through which the electron beams (R, G, B) generated by the three cathodes 23 pass and - as shown in FIG. 1 - Impact on the phosphor layer 25 applied to the inside of the screen 11.
  • the tube axis Z is also shown in FIG. 2 by the lines indicated above and below the jet generator system.
  • the dash-dotted arrows indicated above the convergence pot 22 illustrate that the central electron beam G runs on the tube axis Z and the two outer beams R, B run at an angle to the center beam G.
  • the center beam G which excites the green phosphor 25 on the screen 11 in the exemplary embodiments shown here, need not necessarily be used to excite the green phosphor 25. Rather, in another embodiment (not shown), the cathode assignment can be selected as it is in connection with another application filed under an earlier filing date the applicant is described.
  • an in-line jet generator system 14 is shown schematically in plan view.
  • the three cathodes 23R, 23G, 23B are arranged on the left side of FIG. Spaced from the cathodes 23R, 23G, 23B is first the grid 1 (18), then the grid 2 (19), then the focusing electrode 20 and then the grid 4 (21). Of the grid 3 electrode 20, only the grid 3 lower part 20.1 and the grid 3 upper part 20.4 are shown. Openings 27R, 27G, 27B are arranged in the electrodes 18 and 19 centrally to the cathodes 23R, 23G, 23B.
  • the s-distances (A1) of the centers of the openings 27R to the centers of the openings 27G and the centers of the openings 27B to the centers of the openings 27G are the same and are 6.6 mm in the exemplary embodiment shown.
  • the other electrodes 20 (20.1 and 20.4), 21 also have openings, which are designated 28 in FIG.
  • the openings 28G like the openings 27G, are aligned centrally to the cathode 23G or to the tube axis Z. With increasing distance of the openings 28 arranged in the grids 20 (20.1 and 20.4), 21 from the cathodes 23, these openings 28 have increasing cross sections.
  • each individual grating 18 to 21 are of the same size for the different electron beams R, G, B.
  • the opening cross sections per grating for the different electron beams can be of different sizes.
  • FIG. 3 the arrangement of a beam system 14 according to the invention is illustrated only for the external beam R, while the outer beam B shows an arrangement according to the prior art.
  • the grating opening arrangement for the center beam G is the same.
  • the s spacings (A2R, A2B) in the lower part 20.1 of grid 3 (20) for the electron beams R and B are different in size.
  • the s-distance (A2R) is 6.62 mm and the s-distance (A2B) as well as the s-distance (A1) is 6.6 mm.
  • the s-distance (A3) in the upper part 20.4 of grid 3 (20) is the same for both the electron beam (R) and for the electron beam (B) and, like the s-distance (A1), is 6.6 mm.
  • the s-distance in grid 4 (21) is designated. It is 6.785 mm for the electron beam (R) and for the electron beam (B).
  • an electron beam B emitted by the cathode 23B according to the prior art with a given grid 3 and grid 4 voltage in the transition from the upper part 20.4 of the grid 3 (20) to the grid 4 (21) corresponds to the solid line (B) bent towards the center beam (G).
  • the grid 3 voltage is the focus voltage (U G3opt ) that has been visually determined for this system or this tube type and is regarded as optimal.
  • the grating 3 voltage is adjusted accordingly to the end setting of the tube in order to adjust the already mentioned compromise between sharpness and convergence.
  • the course of the blue electron beam according to the prior art is shown, the grating 3 (20) of which is subjected to a higher grating 3 voltage than the optimal focus voltage (U G3opt ) for compromise adjustment.
  • the electron beam (B) is bent less strongly in the transition region between the two grids in the direction of the center beam (G). This is indicated by the dashed line (B '').
  • the electron beam (R) is not only in the transition from grid 3 [20 (20.4)] to grid 4 (21), but also in the transition from grid 2 (19) to grid 3 [20 (20.1 )] bent towards the center beam (G). This is achieved by increasing the s-spacing (A2R) in the lower part of grid 3 [20 (20.1)].
  • the remaining grid parts remain unchanged according to the prior art. This is shown for the course of the red electron beam in the upper part of FIG. 3.
  • the solid course of the electron beam (R) is given when the grating 3 (20) has an optimal blue beam path (lower part of FIG 3) valid focus voltage (U G3opt ) is applied.
  • the effect of the pre-focusing lens 19, 20.1 is increased.
  • the effect of the main lens is weakened by increasing the grating 3 voltage.
  • the latter is expressed in that the beam R ′′ is angled less than the beam R in the direction of the center beam (G).
  • the effect of the pre-focusing lens and the main lens in the beam path (R), despite the increase in the grating 3 voltage, means that the beam (R ′′) at point (F) also converges with the center beam (G).
  • the independence of the grid 3 convergence run from an increase or decrease in the grid 3 voltage is given in a range of ⁇ 800 volts based on the optimal grid 3 voltage (U G3opt ).
  • the optimal focus voltage (U G3opt ) was approximately 8350 volts with an anode voltage (U A ) of 28500 volts.
  • the optimal focus voltage (U G3opt ) was able to influence the convergence within a voltage range of ⁇ 500 volts be modified.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP94111104A 1993-08-12 1994-07-16 Dispositif de faisceau in-line pour tubes images Withdrawn EP0638921A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4327080 1993-08-12
DE4327080 1993-08-12
DE4330370 1993-09-08
DE4330370A DE4330370A1 (de) 1993-08-12 1993-09-08 In-Line-Strahlsystem für Bildröhren

Publications (1)

Publication Number Publication Date
EP0638921A1 true EP0638921A1 (fr) 1995-02-15

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Application Number Title Priority Date Filing Date
EP94111104A Withdrawn EP0638921A1 (fr) 1993-08-12 1994-07-16 Dispositif de faisceau in-line pour tubes images

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EP (1) EP0638921A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2303374A1 (fr) * 1975-03-03 1976-10-01 Rca Corp Canon a electrons perfectionne pour tube cathodique
DE2832687A1 (de) * 1978-07-26 1980-02-07 Licentia Gmbh Farbbildkathodenstrahlroehre
US4728859A (en) * 1985-09-09 1988-03-01 Matsushita Electronics Corporation In-line electron gun

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2303374A1 (fr) * 1975-03-03 1976-10-01 Rca Corp Canon a electrons perfectionne pour tube cathodique
DE2832687A1 (de) * 1978-07-26 1980-02-07 Licentia Gmbh Farbbildkathodenstrahlroehre
US4728859A (en) * 1985-09-09 1988-03-01 Matsushita Electronics Corporation In-line electron gun

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J GERRITSEN ET AL.: "An electron gun design for flat square 110 color picture tubes", PROCEEDINGS OF THE SID., vol. 28, no. 1, 1987, LOS ANGELES US, pages 15 - 19, XP000006631 *

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