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Changing your monitor's refresh rate

By , 3 Jun 2000
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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.dmFields = DM_DISPLAYFREQUENCY;
   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 PinmemberVirustau14-Apr-06 1:12 
GeneralPlease, some explanations! PinmembermAXX30-Nov-01 3:04 
GeneralAn error of great magnitude :-) PinsussRavi Bhavnani23-May-00 17:53 
GeneralRe: An error of great magnitude :-) PinsussDan Pilat24-May-00 10:43 
GeneralRe: An error of great magnitude :-) PinsussWatson12-Aug-00 4:32 
GeneralRe: An error of great magnitude :-) PinmemberAnonymous13-Nov-00 16:31 
GeneralRe: An error of great magnitude :-) PinmemberJohn T6-Mar-05 4:34 
GeneralCareful here! PinsussGeorge23-May-00 17:25 
GeneralRe: Careful here! PinmemberShimon20-May-01 4:07 
GeneralRe: Careful here! PinmemberAnonymous19-Jun-01 23:55 
GeneralRe: Careful here! PinmemberAnonymous10-Nov-01 4:55 
GeneralRe: Careful here! PinmemberMe_29-May-02 22:15 
GeneralRe: Careful here! PinsussAnonymous4-Aug-02 3:22 
GeneralRe: Careful here! PinsussAnonymous27-Jul-03 8:29 
GeneralRe: Careful here! PinmemberRaul Sobon20-Apr-04 2:42 

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