Touch-it CE OEM glass 7
Instruction Manual
Document No.: PA10009463
18 / 24
Dez. 2021, Revision 01
The international standard ISO 9241-307:2009 defines, on an international level, the maximum possi-
ble pixel errors in an LC-display. This standard discribes different error types, in consideration of differ-
ent pixel error classes.
There are the following pixel error classes, each with three differnet error types:
Maximum acceptable errors per 1 Mio. pixels according to ISO 9241-307:2009
error class
error type 1
pixel constantly il-
luminatied
error type 2
pixel constantly
dark
error type 3
subpixel con-
stantly illumi-
natied
error type 4
subpixel con-
stantly dark
0
0
0
0
0
I
1
1
n = 0 to 2
2 - n
2 x n + 1
II
2
2
n = 0 to 5
5 - n
2 x n
III
5
15
max. 50
max. 50
IV
50
150
max. 150
max. 150
Why this classification of errors?
Each pixel of a display contains three subpixels which have the basic colors red, green and blue. The
combination makes it possible to show a wide spectrum of colors.
Considering for example the display solution of 1280 x 800 pixels, thereof a total of 1,024000 pixels or
3,072000 subpixels are embedded in the display area. This means , the display holds 3,072000 single
transistors at an area of 261.1 mm by 163.2 mm.
These figures make it clear that it is not possible to specifically produce defect-free displays even by to-
day's manufacturing standards.
Christ Electronic Systems GmbH therefore adapts to the corresponding requirements of most interna-
tional manufacturers. The displays must always comply with error class II. If the permissible number of
errors of the pixel error class II is not exceeded, there is also no complaintable "failure" of the display.
Refering to the calculation, the following errors can occur in the display:
•
Max. 2 constantly illuminated and 2 constantly dark pixels
•
Max. 5 constantly illuminated or 10 constantly dark subpixel
Avoid burn-in on displays
NOTICE
Images that do not change
"Image shadows", "ghost images" arise
➢
Changing displayed images, screen saver, energy-saving mode
With LC displays, so-called "ghost images" or "image shadows" can occur under certain circumstances.
These are images that remain from the previous image and are felt to be "burnt into" the display. These
do not remain forever. If "image shadows" occur, the device should be switched off for a longer period
of time so that the burnt-in image disappears.
