I am building my home theatre. I am at the stage of trying to decide whether to use a screen or paint the wall flat white.There is no light in the room and the projector is more than bright enough 2000 lumens. I tried the projector out on the white dining room wall and was more than happy with the bright clear picture . I adjusted the size of the picture to 102",the size of my wall in the theatre. what i am wondering about would a ready built screen make any difference to the sharpness of the picture. Has anybody compared the the Difference ,if any ,it makes ???????? alan