LCD memory effect

The LCD memory effect ( English Image Persistence , i.e. 'image' and 'afterglow') describes the occurrence of ghost- like image disturbances in liquid crystal displays (LCDs). In normal use of a thin film transistor -Displays ( TFT = English thin film transistor ), the problem actually is not.

symptom

If an LCD shows light pixels in particular at certain points over a longer period of time , the pixels remain translucent for longer, in contrast to other screen regions that display changing content / brightness, even if the excitation voltage required for this has already been omitted. Since this is particularly noticeable at contrasting edges, it is often compared with ghost images in video tubes, which however have a different cause.

The inertia of the LCD pixels disappears as soon as the device is switched off for a longer period of time. Frequent similar or identical continuous excitations show signs of wear in the form of shorter time periods before a ghost image is established. If a TFT display is used for presentation, it should therefore be switched off at least during the night. In general, a TFT ( Thin Film Transistor ) should not be switched on for longer than 24 hours. These phenomena can be traced back to an error in the control, especially with passive displays .