Dual Scan

Dual Scan
Dual Scan
 
[dt. »Zweifachabtastung«], Verfahren, das den Bildaufbau bei Flüssigkristall-Bildschirmen (LCD) beschleunigt. Es kommt bei LCDs mit passiver Matrix zum Einsatz.
 
Beim Dual Scan werden die Bildschirmzeilen zu zwei gleich großen Einheiten zusammengefasst, die sich jeweils getrennt ansteuern lassen, etwa alle oberen und alle unteren Zeilen oder alle geraden und alle ungeraden. Das Bild wird in beiden Einheiten gleichzeitig aufgebaut. Dieses parallele Vorgehen halbiert die benötigten Zeiten. Dementsprechend wird das Bild doppelt so oft aktualisiert.
 
 
TFT-Bildschirme arbeiten ohne Dual Scan, weil sie als aktive Bildschirme ohnehin nicht so träge sind wie LCDs und daher bei der Darstellung von Bewegungen keine Probleme bereiten.

Universal-Lexikon. 2012.

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