Jensen je1507dc ユーザーズマニュアル

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Basic Operation
26
Using the ZOOM button
Full Screen  
ZOOM
Select to enlarge the 16:9 picture vertically only, to fill the display area.
Select to enlarge the picture horizontally and vertically to an equal aspect ratio 
that fills the wide screen.
Source
Final
Full Screen  
Source
Example:
Example:
Final
ZOOM