G - Physics – 09 – G
Patent
G - Physics
09
G
G09G 3/36 (2006.01)
Patent
CA 2560473
A device for detecting a fixed image on a liquid crystal display screen (12) comprising at least one photoelectric cell (4) which can provide a luminance signal 1(t) to means (8) for the treatment of said signal. The cell is disposed opposite a display area (Z) of the screen. In said display area, it is possible to control the display of a variable pattern at a characteristic frequency fc. The treatment means can detect the characteristic frequency in the signal 1(t). In the event of non-detection, they trigger a corresponding alarm.
Un dispositif de détection d'image figée sur un écran à cristaux liquides (12) comprend au moins une cellule photoélectrique (4) apte à fournir un signal de luminance 1(t) à des moyens (8) de traitement de ce signal. La cellule est disposée face à une zone d'affichage (Z) de l'écran. Dans cette zone d'affichage, on commande l'affichage d'un motif variable à une fréquence caractéristique fc. Les moyens de traitement sont aptes à détecter la fréquence caractéristique dans le signal 1(t). En cas de non détection, ils déclenchent une alarme correspondante.
Marks & Clerk
Thales
LandOfFree
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