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  1. #1
    smbrush is offline Experienced Developer
    Windows 7 64bit Access 2010 64bit
    Join Date
    Jun 2018
    Posts
    30

    Help with understanding screen resolutions in a multi-monitor environment

    I have a two monitor environment. My primary monitor is on my laptop, having a screen resolution of 1920 X 1080. My second monitor stands alone and has a resolution of 1440 X 900. These form a continuous virtual screen.



    What's confusing is that, according to several Windows API functions such as GetSystemMetrics and GetMonitorInfo, the second monitor's left position is 2880 and its right position is 5040. Now, 1920 + 1440 = 3360, not 5040. 2880 is not 1921.

    My guess is that the difference in pixel position has something to do with the different sizes of my two monitors. My Lenovo T470 laptop has a screen diagonal of 14 inches and my Lenovo ThinkVision stand-alone monitor has a screen diagonal of 19 inches.

    Can someone please tell me what the formula is for calculating a left pixel position of 2880 and right pixel position of 5040 for my second monitor. I appreciate any help anyone can provide.

  2. #2
    isladogs's Avatar
    isladogs is offline MVP / VIP
    Windows 10 Access 2010 32bit
    Join Date
    Jan 2014
    Location
    Somerset, UK
    Posts
    5,954
    Just discovered this unanswered post lurking in the ether almost 3 months on...!
    In case you are still looking for a solution:

    1. If your screen settings are to duplicate these displays, both will have the lower resolution. In your case 1440x900
    2. I created the attached utility whilst trying to develop code for multiple monitors - its not quite finished but may still be useful to you.
    Only one button is enabled at the start - click that to enable all other items
    Recommend you don't use button 2 if you have duplicated displays as you may have to reboot to regain control
    Its fine for extended displays however

    Hope that helps
    Attached Files Attached Files
    Colin, Access MVP, Website, email
    The more I learn, the more I know I don't know. When I don't know, I keep quiet!
    If I don't know that I don't know, I don't know whether to answer

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