if you are facing display problem their must be some problem in lcd so you can repair it or take a new lcd
use the warranty, we can't help you if we don't know what is the cause. maybe you have to take it into service. don't try to fix it yourself if you don't know, because laptop is much difficult to repair than computer.
Hmmm... i think there's no difference on encountering problems like the other laptop brands, but if you encountered some problem on you dell, maybe because there's an improper use of it and the other one is a technical problem on it. just use your 1 - 2 year warranty of the laptop dude.
Laptop Backlight??? Maybe you should check your lcd, or you can try to install a new video card driver. Have a try!