The two most common aspect ratios in home video are 4:3 (also known as 4x3, 1.33:1, or standard) and 16:9 (16x9, 1.78:1, or wide-screen). ... However, when you watch 16:9 and 4:3 aspect ratio content on your 2.35/2.40 projection screen, you will have black bars on the left and right of the projected image.