Why are my RAW images grainy on some devices after saving as JPG files?

I am new to the world of photography, so forgive me if my question is silly.
I just recently started shooting in RAW format.  After editing my photos and saving them as JPG files, I am running into a problem.  When I view the image files on my computer, my iPad, or my iPhone, they look great.  I can even zoom in super close, and the images still retain amazing quality.  However, when I set them as a desktop background, they are SUPER grainy.  Here is an example.  I just took a screen grab of each one on my computer.  Here is the first one, which is the file itself when opened in Microsoft Office 2010.
Here is the screen grab of the same exact same file when I set it as a background on my computer:
Is this an issue with processing/editing/whatever the technical term may be?  Or, is this a computer display issue?  I could almost understand if the images were different files, but they are the same file.  Can anyone help me out?   I have a friend who wants me to take some photos for her this weekend, and I'm scared to shoot in RAW format for this reason, although I do enjoy the control I have over my images in that format.  I'm also scared to see what my photos look like when printed. 
Thanks in advance!

It’s really impossible to make a judgment from screen grabs. But how are you making the desktop background; ideally you should be using the original to make a re-sized image at the native resolution of your monitor.

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