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Also referred to as “response rate” or “latency,” an LCD monitor's “response time” is a measure of how fast it can display moving images. What is actually measured is how quickly the monitor’s individual pixels can change colors, as indicated in milliseconds (ms), with the fewer milliseconds indicating a faster pixels change rate.
More formally defined, “response time” is the time it takes for an LCD pixel to change from a completely active black state, to a completely inactive white state, and back again. In real-world use, however, pixels are rarely in an all-white or all-black state, so manufactures will often report the speed at which pixels change from color to color (called “gray-to-gray” speed). The Video Electronics Standards Association (VESA) will soon introduce specifications to standardize response time reports, in an effort to make manufacturers’ numbers more comparable.
However “response time” is measured, faster is better when it comes to your viewing experience, and the difference is easily discerned in everyday use. If an LCD's response time is too slow, the display's pixels won't be able to keep up with the information sent from the computer's graphics card, and you'll see ghosting, streaking, and digital “noise” as a result. This is especially true for games, movies, and graphic applications.
While most monitor manufacturers recommend a response time of around 12–15ms as a baseline for average use, response times are falling quickly as LCD technology continues to become more advanced. For example, LG currently offers many LCD monitors with response times of 5ms. Ultra-low response times are important not only to help you get the most out of today’s cutting-edge games, videos, and graphics applications—but also to help you keep pace with the ever-faster games, videos, and applications of tomorrow.