Monitor(Display) driver for Dell Inspiron 6400????

I recently purchased an Inspiron 6400(E1505).

After formatting and reinstalling Windows, I cannot figure out the right driver for the monitor(display, not the video card). My 6400 has a 15.4 inch Wide Screen XGA Display with TrueLife.
I already checked support.dell.com, and the list for display driver is huge.

Any idea for which driver i should use? Or it's not necessary to install the driver, since the display seems working well.

Here are some screen shots( click for larger view).

Thanks for help

 

those are for external monitors. you don't need one.

 

Thanks.

why do they put all these drivers under the category of Inspiron 6400. It really confuses noobs like me

 

for external monitors such as if you bought another dell monitor with that system... then for that monitor you should use those drivers... you know you need a display driver or any other driver for that matter when you go to device settings and in there it says the yellow questionmark next to unknown device... or something like that... thats when you need a driver..