Originally Posted by mrkazador
I don't know if you know this but response time and input lag are two different things.
... lag measured by the difference between the time a signal input enter a display and the time it takes for that input to be shown on the display.
Display lag is not to be confused with pixel response time.
Response time is the amount of time a pixel in an LCD monitor takes to go from one value to another and back again. It is measured in milliseconds (ms). Lower numbers mean faster transitions and therefore fewer visible image artifacts.
Older monitors with long response times would create a smear or blur pattern around moving objects, making them unacceptable for moving video. Long response times can be annoying to a viewer depending on the type of data being displayed and how rapidly the image is changing or moving. Current LCD monitor models (such as those with 120Hz or 240Hz refresh rates) have improved to the point that this is only seen with extreme contrasts.
Response time = Ghosting or smearing, this issue solely depends on the display
input lag = time it takes to see input on screen. can have many factors, such as type of keyboard/mouse, drivers, background processes, system performance, display, etc...,
EDIT FOR CLARITY:
generally when people measure response time, they are measuring the signal after it has been output from the computer and passed through all the internals and processing of the monitor itself. They are measuring the time it takes for the signal to enter the panel and display a given color.
Analogy: response time
Imagine tipping a bottle of honey upside down. and measuring the time it takes for a drop of honey to hit the floor. for this example, we will not measure the time it takes for the honey to run down the side of the bottle to reach the cap, nor will we measure the amount of time it takes to bead up at the tip. We are only measuring the time it takes for the honey to fall to the ground once it is suspended in free air and no longer in contact with the bottle.
the time it takes from the moment you begin thinking about the bottle of honey, to the time it takes you to extend your arm to pick up the honey, tipping it over, flowing through the bottle, this timer stops once the drop of honey hits the floor.Edited by Cheetohz - 9/18/12 at 7:11pm