In most classrooms, many students sit farther away than that, so you might want to allow them to move up to watch your presentation. Also, a television mounted too high on the wall, does not offer a good viewpoint for students. Connect the cord to the TV into the Video-In plug. Push the Input button on the television. Now what's on the computer screen will appear on the television.
Slide shows with a few, large sized words show up well too.
The Cons Slides with lots of writing do no show up well at all. Words can look somewhat fuzzy. So you have to create slides with that awareness. An LCD panel connects to a computer and sits on top of an overhead projector. So, this option lets you project to a large screen.