Da-Lite Parallax 120" Fixed Frame Projection ScreenDa Lite Parallax 120" Fixed Frame Projection Screen The Da Lite Parallax 120" Fixed Frame Projection Screen combines advanced ambient light rejection with a precision fixed frame to deliver cinema quality images in rooms that arent pitch dark. Parallax technology uses a micro layered optical lens system designed to reject ambient light from windows and other fixtures, producing a vivid, TV like picture both when content is playing and when it is idle.