EP 1726003 A1 20061129 - DEVICE FOR DETECTING A FIXED IMAGE ON A LIQUID CRYSTAL DISPLAY SCREEN
Title (en)
DEVICE FOR DETECTING A FIXED IMAGE ON A LIQUID CRYSTAL DISPLAY SCREEN
Title (de)
EINRICHTUNG ZUM ERKENNEN EINES FESTEN BILDES AUF EINEM FLÜSSIGKRISTALL-ANZEIGESCHIRM
Title (fr)
DISPOSITIF DE DETECTION D'IMAGE FIGEE SUR UN ECRAN A CRISTAUX LIQUIDES
Publication
Application
Priority
- EP 2005051209 W 20050316
- FR 0402871 A 20040319
Abstract (en)
[origin: WO2005096261A1] 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.
IPC 8 full level
G09G 3/36 (2006.01)
CPC (source: EP US)
G09G 3/3648 (2013.01 - EP US); G09G 2320/029 (2013.01 - EP US); G09G 2320/043 (2013.01 - EP US); G09G 2320/0626 (2013.01 - EP US); G09G 2330/08 (2013.01 - EP US); G09G 2330/12 (2013.01 - EP US); G09G 2360/144 (2013.01 - EP US)
Citation (search report)
See references of WO 2005096261A1
Designated contracting state (EPC)
BE GB
DOCDB simple family (publication)
FR 2867890 A1 20050923; FR 2867890 B1 20061103; CA 2560473 A1 20051013; EP 1726003 A1 20061129; US 2007222474 A1 20070927; WO 2005096261 A1 20051013
DOCDB simple family (application)
FR 0402871 A 20040319; CA 2560473 A 20050316; EP 05717074 A 20050316; EP 2005051209 W 20050316; US 59340805 A 20050316