Missing external display 1920x1080 resolution, only shows 1680x1050... Please HELP !

When connecting my Macbook Air (mid 2011) to an external LG 22" Display (M2241A) which supports a native resolution of 1920x1080, the closest setting available in the display preferences is 1680x1050, and aspect ratio is really distorted at this size. I use an Apple mini-display-port to HDMI, and HDMI cable to connect the Monitor.
What can I do to correct this problem ? How do I make the 1920x1080 available and get rid of the distortion ?

Thanks for your quick answer, but... When I use the 1080p resolution, I need to use Underscan, and the colors change, the fonts get all blurry and overall definition goes really bad. Really seems like a TV setting.
Maybe okay to watch a movie, but not to work in Photoshop and get design work done properly.
The external display only has HDMI + VGA inputs.
So I guess the next step is to try finding a different connector (mini-display to VGA) But I am now in Chile, Patagonia, and believe me, this will be quite a challenge to find !!! Also, no way to buy at Apple online store and get it shipped here in Chile... :-(((

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