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

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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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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creator DE LAUZUN FREDERIC
description 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.
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subjects 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
title Device for Detecting a Fixed Image on a Liquid Crystal Display Screen
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