LCD's can be overdriven by a combination of voltage and frequency, which will result in cross talk or "ghosting" Ghosting is the appearance or partial activation of an "off" segment. This condition occurs when high drive voltage and frequency are applied. Since the current is directly proportional to the frequency, there is a voltage-frequency product which must not be exceeded. These values are very dependent on the design and layout of any given part, so proper display design and choice of driving conditions is important. From a design standpoint, the goal is to make the common plane electrode as large as possible to keep the resistance low. It is also very important that all unused segments be connected to the backplane, and not allowed to float

A full technical discussion of "Ghosting" can be found in our App Notes section.