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Telephone: 1300 884 987
Internet: www.medion.com.au
21
Pixel Errors In The Monitor
A total of
approx. 6.2 m
control transistors are used in the case of Active Matrix TFTs with a resolution
of
1920 x 1080 pixels
,
each
composed
of three sub-pixels (red, green, blue). A failure or incorrect
control of pixels or individual sub-pixels can arise occasionally, because of this very high number of
transistors and the extremely complex manufacturing process associated with it.
There have been continuous approaches to define the number of permitted pixel errors in the past.
However, these attempts have for the most part been very complicated and completely different from
manufacturer to manufacturer. MEDION follows the strict and transparent requirement of the
ISO
13406-2, Class II
Norm, which are summarised in brief in the following, in the handling of guarantees
for all display products for this reason.
Among other matters, the 13406-2 ISO Standard defines generally
applicable guidelines in relation to pixel errors. The pixel errors are
categorised into four error classes and three types of error. Each
individual pixel is composed in its turn of three sub-pixels each with a
basic colour (red, green, blue).
Types of pixel error:
Type 1:
Pixels shining for a long time (bright, white point), although
not
activated.
A white pixel arises because of the illumination of all three sub-pixels.
Type 2:
Pixels not shining (dark, black point), although activated
Type 3:
Abnormal or defective sub-pixels coloured red, green or blue (e.g. shining for a long time with half
brightness, not lighting one colour, flashing or flickering, but not Type 1 or 2)
Addition: Cluster of Type 3 (= failure of two or more sub-pixels in a block of 5 x 5 pixels. A cluster is a
field of 5 x 5 pixels (15 x 5 sub-pixels).
Classes of pixel error:
Error Class
Type 1 Type 2 Type 3 Cluster of Type 3
I
0
0
0
-
0
II
2 2 5 - 2
III
5
15
50
5
IV
50
150
500
50