Default [Q] S9920 Display Resolution Problem

Hi all,

Just got my Star S9920 MTK 6572 from AliExpress.
As described on the page, it should have a display resolution of: 800x480 pixels
But I just see an actual resolution of about 400x480 pixels, i think, one row shown, one row missing

As you can see in the images:
- The android screenshot looks OK: 800x480 pixels of image, the dot of the letter "i" has 2 pixels, plus antialiasing

- The picture I took of the display shows missing pixel rows, the dot of "i" has only one pixel. And the text, especially small fonts, look really bad.

Can anyone please confirm it is supposed to be like this?
Or is that a setting in Android / Stock ROM / OpenGL / etc?
Or is my phone just broken.

Best regards,
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