Surely the display has a 20x2 male header. The CTE Due Adapter has a 20x2 female socket.Every female is happy. Every male is satisfied. It looks as if the display requires VCC = 3.3VThe Adapter probably has a jumper or solder-bridge to select 3.3V or 5V for VCC.Note that clone "CTE" Adapters made by Sainsmart are generally supplied with the wrong settings.I do not own a big 7" display. The backlight takes a LOT of current.David.
Any pictures of this one?