Increasing the refresh rate of my monitor
Q I have a Mac mini connected to an LG monitor. This display is very crisp and clear but I have noticed that I can occasionally detect a slight flickering. The refresh rate is 60Hz, which I think may be the problem. Unfortunately I cannot select the 75Hz option because it won’t let me. If I change from ‘Best for Display’ to ‘Scaled’, some of the resolutions will let me use 75Hz, but they all distort the screen. Can this be fixed? Brian Glynney
A Probably not with your current monitor. The maximum refresh rate is a function of how quickly the monitor can update every pixel on the screen. The higher the resolution, the more pixels have to be refreshed and, beyond a certain point, the monitor must drop from 75 times a second (75Hz) to the next step down, which is 60Hz. For the LG E2242T, for example, the highest resolution that supports 75Hz is 1,280x1,024. This uses a 5:4 aspect ratio, so it will look stretched when it is interpolated to fill a screen that is designed for 1,920x1,080 (16:9 aspect ratio). You can use the monitor’s on-screen menu to change from widescreen to ‘original’, which will get rid of the distortion, but you’ll get black bars at the sides instead. Or you could use 1,280x.720 resolution, if your monitor supports it.
Hold down å when you click Scaled in Display Preferences to see additional screen resolutions.