Your options are:
1. Watch only films with a 1.78:1 screen-size format. Once you factor-in overscan(a picture reproduction problem affecting 99.99% of all displays save for front projectors) you can probably also watch 1.85:1 films, and maybe even, if your overscan is really bad, 1.66:1 films and the picture will appear "black bar free". Or you can watch HDTV, which I believe is all 1.78:1 AR.
2. Watch all fullscreen movies and "stretch" the picture horizontally using TV controls. This leaves you with both a highly distorted picture AND upto 34% missing of the original picture frame.
3. Watch widescreen movies and apply a vertical "stretch" to films with an AR wider than the monitor (such as a 2.35:1 or 2.40:1 movie). This allows you to retain all of the original picture frame... but things may appear very tall & thin.
4. Watch all your material in its original aspect ratio (OAR), you will have to deal with vertical bars on scope movies, and horizontal side bars on academy standard TV & movies, but everything will have all of its original picture and have no 'stretch-induced' distortion.
In otherwords..... there is no way to avoid black bars AND picture distortion 100% of the time.