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BRIGHTDOTEFFECT ACCEPTABLELEVEL
1 lit sub pixel 2
BLACKDOTEFFECT ACCEPTABLELEVEL
1 dark sub pixel 10
TOTAL DOT DEFECTS OF ALL TYPES 12
NOTE: * 1 or 2 adjacent sub pixel defects = 1 dot defect
8.7 MURA
Dark spots or patches may occasionally appear on some liquid crystal display (LCD) panels. This
isknownwithintheindustryasMura,whichisaJapanesetermfor“unevenness.”Itisusedto
describe an irregular pattern or area in which uneven screen uniformity appears under certain
conditions. Mura is a result of the deterioration of the liquid crystal alignment layer and is most
commonly caused by long-term operation under high ambient temperatures. It is an industry- wide
phenomenon and Mura is not repairable. It is also not covered by our warranty terms.
Mura has been around since the introduction of LCD technology and with screens getting bigger
and in operation 24/7, many displays are running in low light conditions. This all adds to the
possibility of Mura affecting displays.
HOW TO SPOT MURA
There are many symptoms of Mura and also multiple causes. Several of these are listed below:
Impurities or foreign particles in the crystal matrix
Uneven distribution of LCD matrix during manufacturing
Non-uniform luminance distribution of the backlight
Panel assembly induced stress
Flaws within the LCD cells
Thermal induced stress - high temperature operation over long periods of time
HOW TO AVOID MURA
Although we can not guarantee the complete eradication of Mura every time, in general the
appearance of Mura can be minimized by these methods:
Lower the backlight brightness
Use a screen saver
Reduce the ambient temperature around the unit
PIXEL DEFECT POLOCY
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