Device for Detecting a Fixed Image on a Liquid Crystal Display Screen

A device for detecting a frozen image on a liquid crystal display screen comprises at least one photoelectric cell capable of delivering a luminance signal l(t) to means ( 8 ) for processing this signal. The cell is placed facing a display area (A) of the screen. In this display area, a variable pat...

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Bibliographische Detailangaben
1. Verfasser:	DE LAUZUN FREDERIC
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CRYPTOGRAPHY DISPLAY EDUCATION MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS SEALS TESTING
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Beschreibung
Zusammenfassung:	A device for detecting a frozen image on a liquid crystal display screen comprises at least one photoelectric cell capable of delivering a luminance signal l(t) to means ( 8 ) for processing this signal. The cell is placed facing a display area (A) of the screen. In this display area, a variable pattern is displayed at a characteristic frequency fc. The processing means are capable of detecting the characteristic frequency in the signal l(t). If this signal is not detected, they trigger a corresponding alarm.