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26. Advertencias sobre los errores de píxeles en
la pantalla
26.1. Norma europea EN ISO 9241-307, clase II
Debido al alto número de transistores y del proceso de fabricación especialmente
complejo que requieren, en algunos pocos casos pueden ocurrir fallos o una excita-
ción errónea de píxeles o subpíxeles individuales.
En el pasado ha habido diversos métodos para definir el número de errores de
píxeles permitido. Pero estos solían ser muy complicados y variaban considerable-
mente de un fabricante a otro. Por esta razón, MEDION, para la ejecución de la ga-
rantía de todos los productos con pantalla TFT, se atiene a las estrictas y transpa-
rentes disposiciones de la norma EN ISO 9241-307, clase II, que se resumen a
continuación.
La norma EN ISO 9241-307 define, entre otros, los requisitos de aplicación general
relacionados con los errores de píxel. Los errores de píxel se categorizan en cuatro
clases de errores y tres tipos de errores. Cada píxel a su vez se compone de tres sub-
píxeles de un color básico cada uno (rojo, verde, azul).
Composición de un píxel
5 Pixel
Lineas
Sub-Pixel
Pixel
azul
verde
rojo
5 Pixel
Tipos de error de píxel:
Tipo 1:
Píxel siempre iluminado (punto blanco claro) aunque no deba estarlo. Un píxel
blanco aparece con la iluminación de los tres subpíxeles.
Tipo 2:
Píxel no iluminado (punto negro oscuro) aunque deba estarlo.
Tipo 3:
Subpíxel anormal o defectuoso de color rojo, verde o azul (p. ej., siempre ilumi-
nado a claridad media, con uno de los colores no encendido, intermitente o des-
telleante, pero no de los tipos 1 ó 2)
Además: Grupo del tipo 3 (= avería de dos o más subpíxeles en un bloque de 5 x 5
píxeles. Un grupo es un campo de 5 x 5 píxeles (15 x 5 subpíxeles).
45


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