Help with Projector display


Hello,

I wanted to get a screen for my projector NEC LT380. My projection has some extra white space behind the actual image. The projector displays the image on the screen but has some white space on top and bottom and some on sides which is just projection of white space but I can enlarge the display to fit that screen. 

Could you please suggest what this is and how I can fix it. I appreciate it a lot. Thanks.


grapecamera
I wanted to use it but looks like I have to buy a new one.  Thanks for all your advise and help.Stay Safe.
Post removed 
I also had a projector that was not designed for watching movies. Therefore, I read about models that have passive 3D technology and high resolution. These are the most suitable projectors for watching movies.