Effects in continuous operation of LCDs
False installation or use of the display during operating time may bring
undesirable partly visible effects. The internal structure of LCD panel may be
changed by outside influences with partly visible effects.
Image Sticking
This phenomenon which named alternatively "image retention", "ghost image",
"memory effect" or "remanent image" appears if the fluid crystals of the panel
depart from the initial position. This undesired effect may occur if same
content is showed continually for long time and thereafter the content
changes. Then possibly old content is still visible as "shade". These effects are
wear marks, which may be intensified by unsuitable usage. It is not a defect!
Image Sticking must not mixed up with "Burn-in", which is a known fact of
plasma displays and cathode ray tubes and is based on completely different
physical mechanisms. Heavy "Image Sticking" may be reversed by long switch
off of the LCD/TFT displays.
Image Sticking of TFT panels is excluded from the warranty.
Mura
Further effect is Mura (a Japanese term for unevenness), which is visible as
cloud formation. These clouds are particularly visible at low brightness. The
most probably for the occurrence of Mura is operating the system in wrong
temperature specifications. These may be caused by to high ambient
temperature as well as poor air supply caused by inconvenient installation or
polluted ventilation system.
Mura of TFT panels is excluded from the warranty.
Shade formation
Dust particle may build up inside the panel caused by high ambient pollution
level. These particles climb up in the panel. This effect starts mostly in corners
of the rim through the different layers by convention and capillary formation.
These pollutions may be reversed by resolving and cleaning of the panel
components in our clean room.
Shade formation of TFT panels by pollution is excluded from the warranty.
EYE-LCD-4600/5500/6500-OPS
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User Manual
