Sony KP 53HS20 Operating Instructions Manual page 42

Using the Features
42
When viewing an enhanced 16:9 picture, the aspect ratio changes to
4:3 in Twin View. The picture will be reformatted to that aspect ratio.
If viewing a 720p or 1080i format input source, the aspect ratio will
maintain the original 16:9 aspect ratio.
Hookups that affect your ability to use Twin View:
- If you are viewing all channels through the cable box, the Twin
View feature will not work. The cable box only unscrambles one
signal at a time, so the right picture will be the same as the left
picture.
- You can watch a scrambled cable channel and another video
source. Be sure your DVD player, VCR or satellite receiver are
connected to one of the VIDEO IN 1-6 and AUX inputs on the rear
of the projection TV. Pictures from equipment connected to VIDEO
5, 6 and AUX will only appear in the left picture, not in the right.
The active picture is highlighted in cyan.