Driven to diffraction

时间:2019-03-07 02:01:02166网络整理admin

By Barry Fox A holographic screen can provide “shocking” improvements in picture quality for rear projection TV sets, says Thomson of France (WO 99/39512). Normally, lenses beam red, green and blue light onto a translucent TV screen. But since the beams hit the screen at different angles, their colours only look pure to a viewer sitting in front of the set. Adding a segmented “fresnel” lens widens the viewing angle,