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EN 9241-307 Class II
Active matrix LCDs (LCD) with a resolution of
1600 x 900
pixel, which are in turn
composed of three sub-pixels each (red, green, blue), contain about
4.3
million
addressable transistors. Because of this very high number of transistors and their extremely
complex production process occasionally defective or incorrectly addressed pixels or sub-
pixels may occur.
There have been several attempts in the past to define the acceptable number of defective
pixels. But this can be difficult and varies widely between different manufacturers.
We, therefore, adhere to the clear and strict requirements of
EN 9241-307,
class II
, for the warranty handling of all LCD display products. These requirements are
summarised below.
Within standard
EN 9241-307
the general requirements regarding pixel defects are
defined. Pixel defects are classified into three failure types and four failure classes. Each
individual pixel is made up of three sub-pixels in the primary colours (red, green, blue).
Pixel structure
Types of Pixel Failures:
Type 1:
A constantly lit pixel (a bright, white spot), even though it is
not
addressed. A white
pixel is caused when all three sub-pixel are lit.
Type 2:
A pixel that does not light up (dark, black spot), although it is addressed
Type 3:
Abnormal or defective red, green or blue sub-pixels.
(E.g. constantly lit with half the brightness, one colour is not shining, blinking or
flickering, but not belonging to Type 1 or 2 Pixel Failures)
In addition: A cluster of type 3 (= 2 or more defective sub-pixels in an array of 5 x 5 pixel).
A cluster is an array of 5 x 5 pixel (15 x 5 sub-pixel).
Rows
Blue
Green
Red
