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Problemen oplossen, eerste hulp en FAQ
TFT-beeldschermen gebruiken.
Pixelfouten op LCD’s (notebooks + monitoren)
Bij actieve matrix-LCD’s (TFT) met een resolutie van 1366 x 768 pixels (XGA), elk weergegeven door
drie subpixels (rood, groen, blauw), worden in totaal bijna 3 miljoen controletransistors gebruikt.
Vanwege dit hoge aantal transistors en het bijbehorende complexe productieproces kan in sommige
gevallen een defecte of foute besturing van pixels en/of subpixels optreden. In het verleden zijn
verschillende pogingen gedaan om het aantal toegestane pixelfouten te definiëren. Doorgaans
waren deze zeer gecompliceerd en volledig verschillend van fabrikant tot fabrikant. Daarom volgt
Targa voor fabrieks- en garantiereparaties de strikte en duidelijke definitie van de ISO 13406-2
klasse II-standaard die hieronder wordt samengevat. De ISO-norm 13406-2 definieert onder andere
universele specificaties met betrekking tot pixelfouten. De pixelfouten worden gecategoriseerd in vier
foutklassen en drie fouttypen. Elke pixel is samengesteld uit drie subpixels met elk één primaire kleur
(rood, groen, blauw).
Soorten pixelfouten
Type 1: pixel brandt altijd (heldere, witte punt)
Type 2: pixel brand nooit (donkere, zwarte punt)
Type 3: abnormale of defecte subpixel van de kleuren rood, groen of blauw (brandt altijd, brandt nooit
of knippert)
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