I have a 7" display attached to my RPI.
Controller Board VS-TY2662-V1 Lcd Panel AT070TN92 Running raspbian.
In theory it has 800x480. I run a website I kiosk mode on it. If I use fixed height and width on that very resolution it's too big for the screen. So I ended up using trial and error to figure out the right resolution (720x575).
The main issue is that the display is stretched, i.e. it shows a 4:3 image on that 16:9 display without borders. Any idea how to solve it?