Samsung SyncMaster 400P User Manual page 173

Image retention may not occur when a LCD panel is operating under normal conditions. Normal
conditions are defined as continuously changing video patterns. When the LCD panel has been
operated on for a long time with a fixed pattern (-over 12 hours-), there may be slight difference in
voltage between electrodes that work the liquid crystal (LC) in a pixel. The voltage difference
between electrodes increases with time, forcing the liquid crystal to lean. When this occurs, the
previous image may be seen when the pattern is changed. To prevent this, the accumulated voltage
difference must be decreased.
Our LCD LCD Display satisfies ISO13406-2 Pixel fault Class II
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