A quick question regarding Letter Box

Hi there,
I am new here and hoping that I can chip in my 2cents.
I have a quick question regarding some old Chinese dvds. Those dvds' screen sizes are labeled as Letter Box. I watch them on my 16x9 tv but don't know which setting is the best for viewing. When I try to use full screen (16x9), the image stretches to fit the screen (fat and short image). When I try to use normal (4x3), the screen is so small with four black bars boxing the image. When I use panorama, the image seems normal in the centre, but it stretches on both sides (which I know it is intended by the manufacturer). When I try zoom, I cannot view the subtitles.
I just wonder anyone with experiences on this. Any help would be appreciated. Thanks!!
I am new here and hoping that I can chip in my 2cents.
I have a quick question regarding some old Chinese dvds. Those dvds' screen sizes are labeled as Letter Box. I watch them on my 16x9 tv but don't know which setting is the best for viewing. When I try to use full screen (16x9), the image stretches to fit the screen (fat and short image). When I try to use normal (4x3), the screen is so small with four black bars boxing the image. When I use panorama, the image seems normal in the centre, but it stretches on both sides (which I know it is intended by the manufacturer). When I try zoom, I cannot view the subtitles.
I just wonder anyone with experiences on this. Any help would be appreciated. Thanks!!