Once you get the actual laptop, you can check for sure by looking in Device Manager - there should be an entry under Monitor that uses the word Flexview.
This is correct presuming that the correct monitor driver is installed, which just isn't the case on most generic installs.
That said, while there is a difference, it is not a massive one, and the 2005 T43 IPS screens are not as clear and bright as 2011 IPS screens (such as an iPad or a Nook Color).
I'd beg to partially differ with the statement above.
No, the old school FlexViews are not as bright as the modern ones - my wife has an iPad 2 and it's extremely
bright, due to its LED backlight. No argument there.
However, when compared to *any* TN panel, viewing angles of an IPS screen - even an aging one - are downright stunning and there is really no comparison. The same holds true for their colour reproduction.