Video circuit generating signals reproducing pictures on screen - has switch which suppresses luminance signal when video signal does not change

The circuit has a picture signal source, at least one luminance circuit and a protective circuit protecting the screen from burning out. The protective circuit is connected to a protective switch completely or partly suppressing the luminance signal generated in the video circuit. A detector detects...

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Bibliographic Details
Main Author JEAN-PIERRE ASMUS ET JOSEPH SOTO
Format Patent
LanguageEnglish
French
Published 11.05.1979
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
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Summary:The circuit has a picture signal source, at least one luminance circuit and a protective circuit protecting the screen from burning out. The protective circuit is connected to a protective switch completely or partly suppressing the luminance signal generated in the video circuit. A detector detects changes in the signal from the picture signal source and a timer start input is connected to the detector, and timer output signal is applied to the protective switch control input, so that the switch is off when the detector has detected no changes during a time interval detrmined by the timer. Procédé et dispositif évitant le marquage de l'écran du tube image par les images fixes d'un jeu électronique. L'amplitude de la modulation du signal vidéo est réduite ou ramenée à zéro lorsque les commandes manuelles du jeu cessent d'être actionnées. Application aux jeux électroniques incorporés ou adaptables aux téléviseurs.
Bibliography:Application Number: FR19770030547