WO1991007048A2 - Dispositif d'ajustement automatique d'une grille de deviation sur une surface d'image - Google Patents

Dispositif d'ajustement automatique d'une grille de deviation sur une surface d'image Download PDF

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Publication number
WO1991007048A2
WO1991007048A2 PCT/EP1990/001906 EP9001906W WO9107048A2 WO 1991007048 A2 WO1991007048 A2 WO 1991007048A2 EP 9001906 W EP9001906 W EP 9001906W WO 9107048 A2 WO9107048 A2 WO 9107048A2
Authority
WO
WIPO (PCT)
Prior art keywords
deflection
sensors
sensor unit
control signals
light beam
Prior art date
Application number
PCT/EP1990/001906
Other languages
German (de)
English (en)
Other versions
WO1991007048A3 (fr
Inventor
Günter Gleim
Jacques Chauvin
Friedrich Heizmann
Original Assignee
Deutsche Thomson-Brandt 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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1991007048A2 publication Critical patent/WO1991007048A2/fr
Publication of WO1991007048A3 publication Critical patent/WO1991007048A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
    • H04N3/2335—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements with calculating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/28—Arrangements for convergence or focusing

Definitions

  • the invention is based on a device for the automatic adjustment of a deflection grid on an image surface in accordance with the preamble of claim 1.
  • the invention is fundamentally applicable when an image is generated on an image surface with a light beam that is deflected in a grid pattern.
  • a preferred field of application is a television projection device, in which three monochromatic images from three picture tubes are projected onto an image area and brought to cover there.
  • a television set is to be understood as any device with electronic image reproduction.
  • the signal can be fed by a television broadcast signal or a video signal from another video transmitter such as a recorder, a camera or another video line.
  • the signal can be an antenna signal, a composite signal, an RGB signal or also a signal separated into luminance signal and color carrier.
  • the images generated in three separate picture tubes for R, G, B are projected onto a projection projected area and brought to cover there to produce a colored image. It is necessary to stabilize certain parameters in the raster deflection on the image surface, in particular the static position and the deflection amplitude of the image projected onto the image surface in the horizontal direction and in the vertical direction. Such adjustment or stabilization is possible in that light sensors are arranged on the image surface which are acted upon by a light beam due to a special marking pulse within the grid. The sensors control the respective deflection parameters so that the light beam is always set to the center of the light sensor on the image surface.
  • the invention has for its object to provide a simple light sensor unit with which a deviation of the light beam striking the image surface from the target position can be detected in all directions.
  • the arrangement of the four independent light sensors in the form of a four-quadrant detector, preferably in one square, enables detection of a deviation of the light beam from the desired position in all directions. This is based on the fact that every deviation within the coordinate system defined by the sensors is defined by the output signals of the sensors.
  • manipulated variables can be obtained which simultaneously indicate the deviations in the horizontal direction and in the vertical direction.
  • the deflection grid in particular its static position on the image surface and the deflection amplitude tude be adjusted in the horizontal and vertical directions.
  • the invention is particularly suitable for compensating for deviations in the deflection pattern due to temperature change or aging.
  • the invention is not restricted to a production television set, but is quite generally suitable for stabilizing a deflection grid on an image surface in order to comply with various deflection parameters.
  • Fig. 4 shows a further measure of the processing of the control signal generated by the sensor unit
  • Fig. 5 is an expanded block diagram for the
  • a light sensor unit 3 is arranged outside or inside the image area 1 and is hit by the light beam also writing the image for a defined time within the deflection grid. The sensor unit 3 then generates a signal which, via the amplifier 4, arrives at an evaluation circuit 5 which stabilizes the respective deflection parameter. 2 shows which parameters of the deflection can be stabilized with such a light sensor 3.
  • the vertical deflection amplitude V can be stabilized with two sensors 3b, 3c arranged at the top and bottom of the image, in that two light beams generated by marking pulses in certain lines of the vertical blanking gap are adjusted to the sensors 3b, 3c.
  • the horizontal deflection amplitude H can be stabilized with two sensors 3a, 3d by fading in marking pulses outside the visible image area 1 at the beginning and at the end of one or more lines. It is also possible to arrange four such sensors 3b, 3c, 3e, 3f on the image area 1 at the corners. With such an arrangement, the static position of the deflection grid and the deflection amplitude can also be stabilized both in the horizontal direction and in the vertical direction.
  • the sensor unit 3 consists of four electrically separated sensors A, B, C, D in an arrangement as a four-quadrant detector.
  • the sensors A, B and D, C lie side by side in the horizontal direction and the sensors A, D and B, C in the vertical direction one above the other.
  • the light beam L hits the center exactly, that is, the coordinate cross of the four sensors.
  • the output signals UA, ÜB, UC, UD of the four sensors A to D pass through amplifiers 4a, 4b, 4c, 4d to the adder stages 6, 7, 8, 9, which, via two subtractor stages 10, 11, the control signals UH for the horizontal deflection and UV for the vertical deflection. According to FIG. 3, these have the following values:
  • the signals UA and UD become smaller and the signals ÜB and UC larger.
  • the manipulated variable UH therefore becomes negative and can be used to regulate the deviation of the beam L in the horizontal direction. If the beam L deviates in the direction -H, UH becomes positive. If the beam L deviates in the + V direction, the signals UC and UD become smaller and UA and ÜB larger, so that UV becomes positive and the deviation in the vertical direction can be corrected. Accordingly, if the beam L deviates in the direction -V, the manipulated variable UV becomes negative. In this way, deviations in the position of L relative to the sensor unit 3 can be corrected in all directions by corresponding values of UV and UH.
  • the light beam deflected onto the sensor unit 3 in rows and grids has a defined, constant dimension in the vertical direction V.
  • a control signal is generated for the vertical direction V, which indicates the position of the light beam on the sensor unit in the direction V in each case.
  • the control signal is e.g. in the center Z of the sensor unit 3 equals zero and rises in the positive direction when the light beam deviates in the + V direction and in the negative direction when the light beam deviates in the -V direction.
  • the light beam L performs a movement in the horizontal direction H during the pulse, ie during its brightening, due to the line-by-line deflection.
  • the light beam thus strikes several sensor points in succession during its brightening in the horizontal direction H.
  • a time-changing control signal thus arises during the brightening, the instantaneous value of which is dependent on the respective point of incidence of the light beam L on the sensor unit 3.
  • Fig. 5 shows an application of the sensor unit described in a television projection device with convergence correction and position correction of the written image. The individual functions in FIG. 5 are explained one after the other.
  • the memories M1-M6 contains all correction values for the horizontal convergence of the picture tube for R, correspondingly the memory M2 contains all correction values for the vertical convergence of the picture tube R etc.
  • the corresponding correction values for the crossing points P are output in succession called up the memories and fed via the adder stages 12 and the D / A converter 13 to the corresponding correction coils. All of the switches S1 shown are therefore in the same switch position for each crossing point P. In practice, the number of switch positions is larger than shown and corresponds to the total number of crossing points P.
  • the switches S1 are actuated by the control circuit St in accordance with the respective position of the light beam within the grid.
  • a total of six correction values are determined for each crossing point P, corresponding to the six correction coils RH, RV, GH, GV, BH, BV.
  • the correction values are determined by marking a crossing point P with an adjustable cursor. By looking at the The convergence point P is set manually.
  • the correction values obtained in each case are determined in the microprocessor 14 and fed to the switch S3.
  • the correction values determined one after the other for a crossing point P are supplied via the switch S3 to the memory locations M1-M6 successively allocated to this crossing point.
  • the respective storage location is predetermined by the switches S2, which are all in the same unchanged position for this process of storing the six correction values for a point P.
  • the number of contacts of the switches S1 and S2 is therefore the same and corresponds to the total number of crossing points P. The process described only follows if the convergence is set for the device for the first time or again.
  • the sensor unit 3 arranged on the image area 1 serves to stabilize the position of the image written on the image area 1.
  • the control circuit St is controlled by the processor 14 via the command line C and generates the RGB control signals for the grating pattern 2.
  • St generates short pulses for the picture tubes R, G, B at defined times within the deflection grid.
  • the sensor unit 3 then generates, as described with reference to FIGS. 1-3, the deviation in the horizontal and vertical directions, representing error signals. These pass through the amplifier 4 and the evaluation circuit 5 to the processor 14.
  • the processor 14 generates a control signal UH or UV for the respective color, with which the position of the deflection grid and thus of the written image on the image area 1 correspond accordingly de correction currents in the deflection unit is corrected. Correction of the position of the picture
  • the control signals UH, UV are successively supplied to the respective associated signal paths for RH, RV, GH, GV, BH, BV via the switch S4 controlled by the processor 14.
  • the digital control signals occurring only briefly each arrive at a holding circuit 15a-f in the form of a memory, which continuously maintains the control signal.
  • the control signal is added in the adder stages 12a-12f to the correction values coming from the switches S1. Via the D / A converters 13a-f, in addition to the convergence correction described in the correction coils, they thus cause the deflection raster and the written image to be displaced in the horizontal and vertical directions in such a way that the written image has its desired position relative to the image area 1.
  • the correction coils shown serve both for the dynamic convergence correction, which differs from crossing point to crossing point, and also for the static stabilization of the position of the image.
  • the vertical deflection amplitude or the horizontal deflection amplitude according to FIG. 2 can additionally be stabilized.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)

Abstract

Un dispositif sert à ajuster automatiquement une grille de déviation sur une surface d'image. Un capteur de lumière (3) qui reçoit un rayon lumineux de la grille de déviation est agencé sur la surface d'image (1). Afin d'obtenir une unité simple de détection (3) qui permette de détecter des déviations du rayon (L) dans toutes les directions, l'unité de détection (3) contient quatre capteurs séparés (A à D) qui forment un détecteur à quatre quadrants. Les signaux de commande de la déviation horizontale et de la déviation verticale, qui servent à ajuster le rayon, sont obtenus par différentes combinaisons des signaux de sortie des capteurs (A -a D). Ce dispositif est particulièrement utile pour stabiliser la position de l'image et l'amplitude de déviation dans des postes de télévision projetée.
PCT/EP1990/001906 1989-11-04 1990-10-26 Dispositif d'ajustement automatique d'une grille de deviation sur une surface d'image WO1991007048A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3936790.8 1989-11-04
DE19893936790 DE3936790A1 (de) 1989-11-04 1989-11-04 Einrichtung zum automatischen justieren eines ablenkrasters auf einer bildflaeche

Publications (2)

Publication Number Publication Date
WO1991007048A2 true WO1991007048A2 (fr) 1991-05-16
WO1991007048A3 WO1991007048A3 (fr) 1991-06-13

Family

ID=6392889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001906 WO1991007048A2 (fr) 1989-11-04 1990-10-26 Dispositif d'ajustement automatique d'une grille de deviation sur une surface d'image

Country Status (4)

Country Link
CN (1) CN1051653A (fr)
AU (1) AU6548390A (fr)
DE (1) DE3936790A1 (fr)
WO (1) WO1991007048A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703714A3 (fr) * 1994-09-20 1997-09-03 Matsushita Electric Ind Co Ltd Appareil de détection d'une image affichée et appareil de correction d'image

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4136121C2 (de) * 1991-11-02 2003-06-26 Thomson Brandt Gmbh Einrichtung zum automatischen Justieren eines Ablenkrasters auf einer Bildfläche
DE4137131C2 (de) * 1991-11-12 2003-06-26 Thomson Brandt Gmbh Verfahren und Vorrichtung zur Rasterkorrektur
DE19700204A1 (de) * 1997-01-04 1998-07-09 Thomson Brandt Gmbh Verfahren zur Einstellung der Konvergenz bei einem Projektions-Fernsehgerät
US6196687B1 (en) * 1999-04-16 2001-03-06 Intel Corporation Measuring convergence alignment of a projection system
DE10113835B4 (de) * 2001-03-21 2005-02-10 Carl Zeiss Jena Gmbh Projektionsanordnung zum Projizieren eines Bildes auf eine Projektionsfläche und Verfahren zum Ermitteln von nicht darzustellenden Bildpunkten eines Lichtmodulatorbildbereichs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743883A (en) * 1971-01-15 1973-07-03 Fairchild Camera Instr Co Photodiode apparatus for reducing beam drift of a cathode ray tube display system
GB2048625A (en) * 1979-05-03 1980-12-10 Philips Nv Measuring and adjusting convergence in a shadow mask type display tube
GB2139860A (en) * 1983-05-09 1984-11-14 Gen Electric Co Plc Vibration compensated cathode ray tube display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743883A (en) * 1971-01-15 1973-07-03 Fairchild Camera Instr Co Photodiode apparatus for reducing beam drift of a cathode ray tube display system
GB2048625A (en) * 1979-05-03 1980-12-10 Philips Nv Measuring and adjusting convergence in a shadow mask type display tube
GB2139860A (en) * 1983-05-09 1984-11-14 Gen Electric Co Plc Vibration compensated cathode ray tube display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703714A3 (fr) * 1994-09-20 1997-09-03 Matsushita Electric Ind Co Ltd Appareil de détection d'une image affichée et appareil de correction d'image

Also Published As

Publication number Publication date
WO1991007048A3 (fr) 1991-06-13
DE3936790A1 (de) 1991-05-08
CN1051653A (zh) 1991-05-22
AU6548390A (en) 1991-05-31

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