Typical overscan on most sets is 5% on all sides. Since 1.85:1 films would have 7% black bars, 5% top and bottom is more than enough to hide it.
Usually ditto for 1.66:1 on the left and right. But may see a sliver of black depending on ho well the TV is centered.
Overscan is adjusted in the service menu and you usually have some latitude, but you quickly see why the 5% is the target. Any less ... and you start seeing the limitations of the consumer grade tube design. Geometry problems being to appear that simply cannot be fixed.
Add to that, too little is not good either since you quickly find out that not all DVDs and TV material is centered as well as you'd think. You will see video garbage and black bars and what not on the edges.
Why ... see above. These are consumer grade tubes. If you want data grade tubes at this size ... please add $2000 to the price of your TV.
As a point of reference, not only can you adjust the overscan, etc. via some TV's "service menu" settings, but if you have aspect ratio controls (like my Princeton does), you can *intentionally* make one of the geometry settings "expand" to where a 1.85 DVD has no black bars; of course, this would leave the 2.35 black bars visible, but definitely smaller. I do this for DVD's.
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