A projection display apparatus is provided that is capable of reducing speckle noise, with no image of a flaw or dust noticeable in or on a screen even if it exists in or on an optical component. The projection display apparatus includes a glass rod that makes uniform an optical beam emitted from a laser...http://www.google.de/patents/US8047655?utm_source=gb-gplus-sharePatent US8047655 - Projection display apparatus
