Android screen appears too zoomed in after replacing broken lcd screen

Hey guys so basically i broke my noname 9" tablet (IGET SMART S90). Both lcd screen and digitizer were broken. So i first searched for lcd screen because i couldnt say if the digitizer is working if i cant see anything. So i found 9" lcd screen replacement on ebay it was not for my exact device but i couldnt find replacement for my exact device. So i bought it. Changed broken screen for the new one. Screen was displaying fine but the screen was too zoomed i couldnt see the system buttons for example. Here is a photo [http://imgur.com/a/2lT2t ] so as you can see on the photo i cant see most of the screen. I checked what is my resolution and it was same that my previous screen has (1024x600). I've managed to root the device and intall resolution changer but i don't know which resolution,dpi should i change it to fit my screen. Interestingly enough nobody has this problem on the whole world i couldnt find the same issue anywhere. Thanks everyone for any sort of help

EDIT: Yeah changing overscan does help me but then it looks like this. I just want to move the system buttons not the whole ui