In­creas­ing the re­fresh rate of my mon­i­tor

Mac Format - - MAC SOS -

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.

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