FR2410926A1 - Electronic video TV game - uses small variation of image position to prevent permanent marking of screen - Google Patents
Electronic video TV game - uses small variation of image position to prevent permanent marking of screenInfo
- Publication number
- FR2410926A1 FR2410926A1 FR7736341A FR7736341A FR2410926A1 FR 2410926 A1 FR2410926 A1 FR 2410926A1 FR 7736341 A FR7736341 A FR 7736341A FR 7736341 A FR7736341 A FR 7736341A FR 2410926 A1 FR2410926 A1 FR 2410926A1
- Authority
- FR
- France
- Prior art keywords
- screen
- circuit
- electronic video
- permanent marking
- game
- 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
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The electronic video game circuit prevents permanent marking of the screen when a highly contrasted picture is held on the screen for a considerable time. The synchronisation signal generator of the circuit has a control terminal allowing variation of the recurrent frequency, connected to the output of a wobbulator circuit operating at very low frequency. The wobbulator circuit (7) comprises two operational amplifiers (8, 21) connected to square and triangular signal generators respectively. The variation over a period of several seconds causes a small slow displacement of the image on the screen, preventing the electron beam permanently damaging the particular points.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7736341A FR2410926A1 (en) | 1977-12-02 | 1977-12-02 | Electronic video TV game - uses small variation of image position to prevent permanent marking of screen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7736341A FR2410926A1 (en) | 1977-12-02 | 1977-12-02 | Electronic video TV game - uses small variation of image position to prevent permanent marking of screen |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2410926A1 true FR2410926A1 (en) | 1979-06-29 |
FR2410926B1 FR2410926B1 (en) | 1980-08-22 |
Family
ID=9198382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7736341A Granted FR2410926A1 (en) | 1977-12-02 | 1977-12-02 | Electronic video TV game - uses small variation of image position to prevent permanent marking of screen |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2410926A1 (en) |
-
1977
- 1977-12-02 FR FR7736341A patent/FR2410926A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2410926B1 (en) | 1980-08-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |