73 of 75
25.
European EN 9241-307 Class II Standard
For active matrix LCDs (TFT) with a resolution of
1366 x 768 pixels
, each of which
consist of three sub-pixels (red, green, blue), there are a total of approx.
3.1
million
control transistors in use. Due to this very high number of transistors and the asso-
ciated extremely complex manufacturing processes used, occasionally one or more
pixels can fail or become incorrectly controlled.
In the past, there were a number of approaches for defining the permitted number
of pixel defects. However, these approaches were mostly very complicated and var-
ied from one manufacturer to the next. When handling warranty issues for all of its
display products, MEDION therefore adheres to the strict and transparent require-
ments of the standard
ISO 9241-307, Class II;
which has been briefly summarised
below.
The
EN 9241-307
standard defines, amongst other things, the generally applica-
ble guidelines relating to pixel defects. Pixel defects are categorised into four fault
classes and three defect types. Every individual pixel consists of three sub-pixels,
each of which is assigned a basic colour (red, green, blue).
Pixel structure
5 Pixel
Rows
Sub-Pixel
Pixel
blue
green
red
5 P
ix
e
l
