I use these
http://www.ikea.com/gb/en/catalog/products/30119408
Blu tack to the back of my TV, two along the top and one at each side (centre speaker directly underneath) pointing back at the white wall behind. Works great in reducing eye-strain and I think it draws you into the screen a lot more too. However My tv is wall mounted. not too sure they would work if you tv was too far away from the back wall. I also noticed Ikea are recommending them for this now. I'm convinced I invented using them for that purpose, where's my cut???