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Posted 22 May 2000

Changing your monitor's refresh rate

, 3 Jun 2000
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This article will show you how to change your monitor's refresh rate to a value not available from control panel.
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Changing Your Monitor's Refresh Rate

I have an older Sony Trinitron monitor, made approximately in 1992. It's a 20" monitor that supports a resolution of 1024x768. However, whenever I set it to that resolution via Control Panel, the screen image was distored and horribly bowed. I found, on a NT machine, the only way it worked properly was when the refresh rate was set to 70MHz (a resolution of 800x600 required 72MHz, and I wasn't even interested in 640x480). The problem was the machine I wanted to use it on was running Win98, and the only available refresh rates were 65MHz, 75MHz, and 85MHz. A while later I stumbled upon an Win32 function called ChangeDisplaySettings(). The below code snippet shows how to use it to change the refresh rate:

DEVMODE devMode;
::ZeroMemory(&devMode, sizeof(devMode));
devMode.dmDisplayFrequency = 70;
devMode.dmSize = sizeof(devMode);
ChangeDisplaySettings(&devMode, 0);

I created a console application that gets launched at startup which executes the above code. Initially, when Windows starts up, the screen image is distored, but once the program launches I have perfect 1024x768 resolution. So before you get rid of that monitor you just can't seem to adjust, give the above code a try.


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About the Author

Dan Pilat
United States United States
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Comments and Discussions

Generalabout the code Pin
Virustau14-Apr-06 2:12
memberVirustau14-Apr-06 2:12 
GeneralPlease, some explanations! Pin
mAXX30-Nov-01 4:04
membermAXX30-Nov-01 4:04 
GeneralAn error of great magnitude :-) Pin
Ravi Bhavnani23-May-00 18:53
sussRavi Bhavnani23-May-00 18:53 
GeneralRe: An error of great magnitude :-) Pin
Dan Pilat24-May-00 11:43
sussDan Pilat24-May-00 11:43 
GeneralRe: An error of great magnitude :-) Pin
Watson12-Aug-00 5:32
sussWatson12-Aug-00 5:32 
GeneralRe: An error of great magnitude :-) Pin
Anonymous13-Nov-00 17:31
memberAnonymous13-Nov-00 17:31 
GeneralRe: An error of great magnitude :-) Pin
John T6-Mar-05 5:34
memberJohn T6-Mar-05 5:34 
GeneralCareful here! Pin
George23-May-00 18:25
sussGeorge23-May-00 18:25 
GeneralRe: Careful here! Pin
Shimon20-May-01 5:07
memberShimon20-May-01 5:07 
GeneralRe: Careful here! Pin
Anonymous20-Jun-01 0:55
memberAnonymous20-Jun-01 0:55 
GeneralRe: Careful here! Pin
Anonymous10-Nov-01 5:55
memberAnonymous10-Nov-01 5:55 
GeneralRe: Careful here! Pin
Me_29-May-02 23:15
memberMe_29-May-02 23:15 
GeneralRe: Careful here! Pin
Anonymous4-Aug-02 4:22
sussAnonymous4-Aug-02 4:22 
GeneralRe: Careful here! Pin
Anonymous27-Jul-03 9:29
sussAnonymous27-Jul-03 9:29 
GeneralRe: Careful here! Pin
Raul Sobon20-Apr-04 3:42
memberRaul Sobon20-Apr-04 3:42 

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