Optoma X304M - Manual (Page 30)

English 30
Display
Format
Use this function to choose your desired aspect ratio.
4 4:3: This format is for 4x3 input sources not enhanced for Wide
screen TV.
4 16:9 (XGA series)/16:10 (WXGA series): This format is for 16x9
input sources, like HDTV and DVD enhanced for Wide screen
TV.
4 Letter Box: This format is for non-16x9, letterbox source and
for users who use an external 16x9 lens to display 2.35:1 aspect
ratio using full resolution.
4 Native: Depends on the resolution of the input source – No
scaling is performed.
4 Auto: Automatically selects the appropriate format.
Input Signal Screen Appearance
or 16:9 /16:10 Format 16:9 /16:10 Format
16:9 /16:10 Format 4:3 Format
Native
LBX format
User Controls