Why can I see red / green / blue spots on back-projected image?

Posted by: Loki on 03 May 2014

I frequently see the constituent colours especially in fast motion across the screen in adjacent blocks of red/green/blue. I know that the image is made up of these colours, but other people watching the movie don't see this. We use an HD projector which projects from behind the screen. What's wrong with my eyes?!

Posted on: 03 May 2014 by tonym

It's called the Rainbow Effect Loki, and a fairly common phenomenon with certain DLP projectors.

I appear to be immune but another forum member noticed the same thing occurring with my SIM2 projector on occasion.

Posted on: 03 May 2014 by Loki

Thanks Tony. Anything I can do?

Posted on: 03 May 2014 by tonym

I think its more noticeable if you're sitting off-centre; maybe changing your viewing position might help.

Later types of DLP projectors aren't so prone to this either.

Posted on: 03 May 2014 by Loki

Ours is an Optoma bought November 2012.

I usually sit dead centre!