The word ghost comes from the Greek language and its definition is somewhat complex, since it can refer to different entities. However, this term is often used a lot to refer to the image of a deceased person, since stories of people, these entities can appear to the living.

The medium is the person in charge or the one who can easily communicate with beings who have passed to another plane. This is an ability that those who claim to have it, are developing every day and allows them to break the barriers of the two worlds, that of the living and the dead. Having a conversation with a ghost may seem unusual and unbelievable to many people, but it is the daily life of a medium, both consciously and through dreams.

Ghosts can be images of objects that remain in the fantasies or chimerical visions that arise thanks to dreams and imagination. On the other hand, a graphic effect that can be seen on certain TFT screens is also known by the name of ghost effect, if its response time is too long, that is, if it takes too long to get a pixel to pass from the state active to inactive. The shorter the transition time, the fewer shades of gray will be seen by users.

This effect is also called wake, since it becomes especially evident in things that move at high speed and that seem to leave a trace of their trajectory, due to the slowness with which the device moves, it updates the image around it. Although there are several factors that determine the quality of a TV monitor, a response time of more than 2 milliseconds is not recommended for video playback or for the use of video games in which speed is an essential element, such as racing and action movies.

It is important to emphasize that CRT monitors, which are those with cathode ray tubes, do not have a ghost effect, because the response time is greater than that of a TFT, in which it can be seen, the reason is because the image it is updated per frame, just as it happens with plasma screens.