Using some kind of DVI dongle won't change the fact that you are using an analog LCD. In fact, if you look at a DVI connector, you'll see 3 rows of pins, and a box of 4 pins off to the side, with a kind of crosshair separating them. That box of 4 pins are the analog signal pins for connecting a DVI card to an analog monitor. In the end, you'll still be dealing with an analog signal on an analog monitor. You can't magically change an analog monitor into a digital one by adding some kind of DVI adapter to it.