I'm guessing this person told you this because some projectors, if they're quite cheap/poor quality, will stretch the images. Or alternatively will just display it very poorly and in a grainy quality. However the quality and sheer size of picture tha...
What you need is a line interpolator. the process is very complicated , but not out of reach. You should look to spend about $75,000 plus the projectors. This is best left to professionals since not all projectors are compatible to do this. Each port...
All projectors will be somewhat different, but the link below is to a site that reviews projectors and includes pictures of projectors dissassembled to show component parts. It may provide some ideas.