# QuestionRefresh Rate vs Response Times

#### iknowsomestuff

##### Honorable
Hello,
i looked into Monitors or actually Gaming Laptops and their Displays and got stuck with the following question:

Why are there Displays with e.g. 144Hz refresh rate but a response time (grey grey) of 18ms.
IPS Displays
144Hz means up to 144 pictures per second and thus 1 000ms/ 144 Hz = 6.94 ms per picture.
But how does that fit with the 18ms response time (grey to grey) or 12ms response time (black to white) ? 12ms of Black to white would mean 1000ms / 12ms = 83 Hz

OLED Displays
For example as in the alienware m15:
It got 2.6ms grey to grey and 2.3ms black to white - however only 60Hz.
So basically, measured by response times this would allow even higher refresh rates.

General question:
How do the "high" response times fit in the high refresh rates?
Can you help me with the math?

Data taken from:
Notebookcheck <-- Section Display got a nice table

#### PC Tailor

##### Dignified
Herald
Response times and refresh rates are ultimately 2 different things. And one does not calculate the other, but they are closely linked.

Refresh rate is the number of frames/times the monitor displays an image in a second.
Whereas response time is how long it takes for the pixel to change to that image in a sense.

What you've done there is calculated how often the frame is sent to the monitor. So a new frame is sent to the monitor ever 6.94ms, but then the 18ms is how long it takes for the pixels to change to that new frame.