1:1 : The Aspect Ratio Is Not Adjusted From The Original. (Only Display Port Pc, Hdmi Pc, Rgb Pc); 4:3 : This Selection Will Allow You To View A Picture With An Original 4:3 Aspect Ratio, Black Bars Will Appear On Both The Left And Right Of The Screen; Zoom : This Selection Will Allow You To View The Picture Without Any Alteration, While Filling The Entire Screen. However, The Top And Bottom Of The Picture Will Be Cropped - HP LD4235 User Manual

1:1 : The aspect ratio is not adjusted from the original. (Only Display Port PC, HDMI PC, RGB PC)

4:3 : This selection will allow you to view a picture with an original 4:3 aspect ratio, black bars
will appear on both the left and right of the screen.
Zoom : This selection will allow you to view the picture without any alteration, while filling the
entire screen. However, the top and bottom of the picture will be cropped.
26 Chapter 5 Using the display