Not sure why you would want to distort the correct aspect ratio of the image just to fill the screen, however, as mentioned, scalers do work great to correct an improperly transmitted aspect ratio signal. Letterbox in itself is generally not a problem to solve. In order to view complete wide screen images correctly on a 4x3 screen it is the only way to display the full image and keep the correct aspect ratio.
Broadcasters used to use a method called "pan and scan" where they would cut off the sides of wide screen movies in order to fill the screen vertically and keep the correct aspect ratio, which caused loss of the sides of the original image. Letterbox, in my opinion, is the preferred solution for displaying wide screen images on a 4x3 screen.
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Tim
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