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Bijlage
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Het voorkomen van scherminbranding
Wat is scherminbranding?
Wanneer het LCD-scherm normaal wordt gebruikt, mag er geen scherminbranding optreden. Een normaal
gebruik verwijst naar continu veranderende videopatronen. Wanneer er langdurig een vast patroon op het
LCD-scherm wordt weergegeven (langer dan 12 uur), kan er een licht spanningsverschil optreden tussen
de elektroden in de pixels die vloeibare kristallen besturen.
Een dergelijk spanningsverschil tussen de elektroden neemt naar verloop van tijd toe, waardoor het
vloeibare kristal dunner wordt. Als dit gebeurt, is het mogelijk dat het vorige beeld zichtbaar blijft wanneer
het patroon wordt gewijzigd. Om dit te voorkomen, moet het opgebouwde spanningsverschil worden
verlaagd.
Zwarte matrix
Source Afvoer
Databus-lijn
TFT
Poort
Pixelelektrode
(ITO)
Opslagcondensator
(Cs)
Kleurenfilter
Gemeenschappelijke
elektrode (ITO)
208


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