You can do that now - If the N900 has a CCFL backlight(and I'm sure it is), it's going to be running at several hundred volts. Ergo, high voltage.
(Note: I know that 12" CCFLs in lcd screens and such run at ~600V. Not sure what a 4" one runs at.)

edit:
As far as what I want, I have to say I like LCDs, /because/ of the blacklight bleed. It always reminds me of the Linking Books from Myst, the video portion of which would always turn slightly redish before playing. I also like seeing it because it means the screen's on, and (usually) getting an all-black signal; the screen's not off or broken.

OLED however may be nice in a few years when we can get cheap, high resolution at 120hz with no transition lag. Oh, and true 24bit(or better) color as well!
Note, though, when I get one I'll probably turn down the brightness/contrast: I don't /want/ a 20000 to 1 contrast ratio - It's hard on my eyes.