GB2222058A - Raster horizontal position control device - Google Patents
Raster horizontal position control device Download PDFInfo
- Publication number
- GB2222058A GB2222058A GB8915851A GB8915851A GB2222058A GB 2222058 A GB2222058 A GB 2222058A GB 8915851 A GB8915851 A GB 8915851A GB 8915851 A GB8915851 A GB 8915851A GB 2222058 A GB2222058 A GB 2222058A
- Authority
- GB
- United Kingdom
- Prior art keywords
- horizontal position
- raster
- component
- horizontal
- raster horizontal
- 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
Links
Classifications
-
- 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
-
- 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
- H04N3/227—Centering
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
- G09G1/04—Deflection circuits ; Constructional details not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Details Of Television Scanning (AREA)
Description
2' 2220 58 1 RASTER HORIZONTAL POSITION CONTROL DEVICE
BACKGROUND OF THE INVENTION Field of the Invention
The present invention relates to a raster horizontal position control device which controls horizontal position of raster in a display device. Description of the Prior Art
FIG. 1 is a circuit diagram illustrating a raster horizontal position control device in the prior art, for example, in a display device, standard No. HG6905 manufactured by Mitsubishi Electric Corporation. In FIG. 1, reference numeral 1 designates horizontal drive signal, numeral 2 designates a horizontal output transistor, numeral 3 designates a damper diode, numeral 4 designates a resonance capacitor, numeral 5 designates a horizontal deflection yoke, numeral 6 designates a linearity coil, numeral 7 designates an S correction capacitor, numeral 8 designates a horizontal output transformer, numerals 9, 11 designate rectifier diodes, numerals 10, 12 designate rectifier capacitors, numeral 13 designates a horizontal deflection power source, numerals 16, 17 designate output transistors, numeral 18 designates an inductor, and numeral 23 designates a variable resistor.
Next, operation will be described. Receiving horizontal drive signal 1 in square wave of prescribed 2 frequency (e.g., 15.75 kHz), the horizontal output transistor 2 performs switching operation. Intermittent voltage by the switching operation voltage is applied across the resonance capacitor 4 and to the horizontal deflection coil 5, and ON-OFF operation of the damper diode 3 occurs thereby sawtooth current flows through the horizontal deflection yoke 5. In this case, the S correction capacitor 7 corrects current waveform distortion produced by DC resistance of the horizontal deflection coil or the like, and the linearity coil 6 blocks alternating current. Sawtooth voltage based on the sawtooth current is stepped up by the horizontal output transformer 8 into voltage corresponding to the turn ratio of the winding between A-B and the winding between B-C in its secondary side. Voltage obtained across the winding A-B is rectified by the diode 9 and the capacitor 10, and voltage after the rectification is added to voltage of the horizontal deflection power source 13 thereby a new power source is obtained at the cathode side of the diode 9. Also the voltage obtained across the winding B-C is rectified by the diode 11 and the capacitor 12, and voltage after the rectification is subtracted from voltage of the horizontal deflection power source 13 thereby another new power source is obtained at the anode side of the diode 11. Base current of the output transistors 16, 17 is adjusted by the variable resistor 23 connected between both new i 3 power sources, and current flowing out through the output transistor 16 and the inductor 18 or current flowing in through the inductor 18 and the output transistor 17 is controlled, i.e., DC component of the deflection current flowing through the horizontal deflection coil 5 is controlled thereby the horizontal position of the raster is controlled.
Since the raster horizontal position control device in the prior art is constituted as above described, in order to control the horizontal position of the raster, adjusting step of the variable resistor by manual work is inevitable and time is required for the adjustment, and only one raster horizontal position can be set regarding setting of one device.
SUMMARY OF THE INVENTION is In order to eliminate the above-mentioned disadvantages in the prior art, an object of the invention is to provide a raster horizontal position control device wherein horizontal position of raster can be controlled by control voltage without using a variable resistor, and automatic adjustment is performed using a microcomputer or the like thereby manual labor and time can be saved, and also two sorts or more of the raster horizontal positions can be set in one display device by using a memory or the like.
In order to attain the above object, a raster horizontal position control device according to the 4 invention comprises a raster horizontal position setting circuit connected to a horizontal output circuit of a display device, and a DC component automatic adjusting circuit connected to the raster horizontal position setting circuit for performing automatic adjustment of DC component of deflection current to a horizontal deflection coil.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram illustrating a raster horizontal position control device in the prior art; and
FIG. 2 is a circuit diagram illustrating a raster horizontal position control device according to one embodiment of the present invention.
PREFERRED EMBODIMENT OF THE INVENTION An embodiment of the invention will now be described referring to the accompanying drawings. In FIG. 2, reference numeral 20 designates a control transistor for determining base current of output transistors 16, 17, and collector of the control transistor 20 is connected through a resistor 19 to junction of resistors 14, 15 and emitter thereof is grounded through a resistor 21 and base thereof is connected to a DC control voltage output circuit 22 as a DC component automatic adjusting circuit. In this case, the resistors 14, 15, the output transistors 16, 17 and the inductor 18 constitute a raster horizontal position setting circuit A. In addition, in FIG. 2, 1 1 same or equivalent circuit parts to those of FIG. 1 are designated by the same reference numerals and the overlapped description shall be omitted.
Next, operation will be described. When the DC control voltage output circuit 22 outputs DC control voltage 0 volt, the transistor 20 becomes cutoff state and therefore base voltage of the output transistors 16, 17 is determined by potential dividing ratio of the resistors 14, 15. Consequently, current flowing out through the output transistor 16 and the inductor 18 or current flowing in through the inductor 18 and the output transistor 17, i.e., DC component of the deflection current flowing through the horizontal deflection coil 5 is determined by the potential dividing ratio. In this case, control of the raster horizontal position is performed corresponding to the potential dividing ratio of the resistors 14, 15.
On the contrary, when DC control voltage output of the DC control voltage output circuit 22 rises, collector current determined by the DC control voltage and the resistor 21 flows through the transistor 20, and voltage drop of the resistor 14 due to the collector current causes drop of the base voltage of the output transistors 16, 17. Thus the base voltage of the output transistors 16, 17 is controlled by the DC control voltage and the DC component of the deflection current flowing through the horizontal deflection coil 5 is 6 controlled thereby the raster horizontal position is controlled.
In this case, the DC control voltage output circuit 22 is constituted so as to output DC control voltage of prescribed level automatically in response to input data from the outside, and for example, a microcomputer or the like is used. Also corresponding to setting data outputted from the memory, plural sorts of raster horizontal positions can be controlled regarding one display device by the computer.
According to the invention, since the setting potential of the raster horizontal position setting circuit is controlled automatically by the control output of the DC component automatic adjusting circuit, adjusting step of the variable resistor by troublesome manual work may be omitted, and the raster horizontal position can be automatically adjusted at high accuracy without dispersion using a simple and inexpensive constitution.
i 7
Claims (4)
1. In a raster horizontal position control device wherein a raster horizontal position setting circuit connected to a horizontal output circuit of a display device sets DC component of deflection current flowing through a horizontal deflection coil, and horizontal position of raster is controlled, a raster horizontal position adjusting device comprising a DC component automatic adjusting means connected to said raster horizontal position setting circuit for automatically adjusting the DC component of the deflection current.
2. A raster horizontal position adjusting device as set forth in claim 1, wherein said DC component automatic adjusting means comprises a microcomputer.
3. A raster horizontal position adjusting device as set forth in claim 1 or claim 2, wherein said DC component automatic adjusting means detects plural signals from the outside and outputs the DC component corresponding to respective signals and controls plural sorts of raster horizontal positions.
4. A raster horizontal position adjusting device as set forth in claim 3, wherein the plural signals from 8 the outside are horizontal position control data outputted from a memory.
A Published 1990 atThe Patent Office- State House. 6671 High Holborn. LondonWClR4TP.1Nirther copies maybe obtainedfrom. The Patent Office Sales Branch. St Mary Cray. Orpingtor,- Ke, t BRS 3RLI. Pr,r-cf L,.v TJj., :,p:ex techniques 1,,:. St Mary Crkv. Kent. Ccr. 18' Sales Branch. St Marv Urav. Urpingtor- Je, t t-T,r-ca Lv tecnnicues j,,:. bt zPary uray. Aenz. L;cr. i o
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63183002A JPH0233187A (en) | 1988-07-22 | 1988-07-22 | Raster horizontal position control device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8915851D0 GB8915851D0 (en) | 1989-08-31 |
| GB2222058A true GB2222058A (en) | 1990-02-21 |
| GB2222058B GB2222058B (en) | 1992-10-14 |
Family
ID=16128039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8915851A Expired - Lifetime GB2222058B (en) | 1988-07-22 | 1989-07-11 | Raster horizontal position control device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH0233187A (en) |
| KR (1) | KR920001802B1 (en) |
| DE (1) | DE3924026A1 (en) |
| GB (1) | GB2222058B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245416A (en) * | 1990-06-18 | 1992-01-02 | Samsung Electronics Co Ltd | Magnetic field generating apparatus for forming a plasma |
| GB2303280A (en) * | 1995-07-07 | 1997-02-12 | Lg Electronics Inc | Power supply for rastercentering circuit is derived from EHT flyback transformer |
| GB2326805A (en) * | 1997-06-26 | 1998-12-30 | Daewoo Electronics Co Ltd | A circuit for adjusting the horizontal center of a raster for a monitor |
| EP0987881A1 (en) * | 1998-09-14 | 2000-03-22 | Sony Corporation | Horizontal deflection circuit |
| WO2007030118A1 (en) * | 2005-09-08 | 2007-03-15 | Thomson Licensing | Deflection aparatus having raster positioning circuitry |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2969993B2 (en) * | 1991-02-27 | 1999-11-02 | 松下電器産業株式会社 | Raster position adjustment circuit |
| US6621240B2 (en) * | 2001-03-29 | 2003-09-16 | Thomson Licensing S.A. | Centering circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3144108A1 (en) * | 1981-11-06 | 1983-05-19 | Robert Bosch Gmbh, 7000 Stuttgart | Method for automatic beam alignment in television pick-up tubes |
| US4675581A (en) * | 1986-02-26 | 1987-06-23 | Rca Corporation | Raster positioning circuit for a deflection system |
-
1988
- 1988-07-22 JP JP63183002A patent/JPH0233187A/en active Pending
-
1989
- 1989-06-23 KR KR1019890008695A patent/KR920001802B1/en not_active Expired
- 1989-07-11 GB GB8915851A patent/GB2222058B/en not_active Expired - Lifetime
- 1989-07-20 DE DE3924026A patent/DE3924026A1/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245416A (en) * | 1990-06-18 | 1992-01-02 | Samsung Electronics Co Ltd | Magnetic field generating apparatus for forming a plasma |
| GB2245416B (en) * | 1990-06-18 | 1994-11-16 | Samsung Electronics Co Ltd | A magnetic field generating apparatus and a plasma generating apparatus for use therewith |
| GB2303280A (en) * | 1995-07-07 | 1997-02-12 | Lg Electronics Inc | Power supply for rastercentering circuit is derived from EHT flyback transformer |
| AU680794B2 (en) * | 1995-07-07 | 1997-08-07 | Lg Electronics Inc. | Power supply for a raster center controller for a video display appliance |
| US5691609A (en) * | 1995-07-07 | 1997-11-25 | Lg Electronics Inc. | Power supply for a raster center controller for a video display appliance |
| GB2303280B (en) * | 1995-07-07 | 1999-03-24 | Lg Electronics Inc | Power supply for a raster center controller for a video display appliance |
| GB2326805A (en) * | 1997-06-26 | 1998-12-30 | Daewoo Electronics Co Ltd | A circuit for adjusting the horizontal center of a raster for a monitor |
| US6091212A (en) * | 1997-06-26 | 2000-07-18 | Daewoo Electronics Co., Ltd. | Circuit for adjusting a horizontal center of a raster for a monitor |
| EP0987881A1 (en) * | 1998-09-14 | 2000-03-22 | Sony Corporation | Horizontal deflection circuit |
| US6384548B1 (en) | 1998-09-14 | 2002-05-07 | Sony Corporation | Horizontal deflection circuit |
| WO2007030118A1 (en) * | 2005-09-08 | 2007-03-15 | Thomson Licensing | Deflection aparatus having raster positioning circuitry |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0233187A (en) | 1990-02-02 |
| DE3924026A1 (en) | 1990-01-25 |
| GB2222058B (en) | 1992-10-14 |
| GB8915851D0 (en) | 1989-08-31 |
| DE3924026C2 (en) | 1992-07-16 |
| KR920001802B1 (en) | 1992-03-02 |
| KR910002227A (en) | 1991-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930711 |