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7.6 Mura
Dark spots or patches may occasionally appear on some liquid crystal display (LCD) panels. This is
known in the industry as Mura, 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 run in low light conditions. This all adds to the possibility of
Mura affecting displays.
How to detect 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 cell
•
Thermal induced stress - high temperature operation over long periods of time
How to avoid Mura
Although we cannot 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 screensaver
•
Reduce the ambient temperature around the unit
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