@ICEknight: Inverting the display is very easy in fact, you need to rotate 90 degrees the polarizing sheet (the tinted sheet) and you invert the display. This is how it's done with Color LCD games, they rotate the polarizing sheet and put a light source behind the LCD display (like the Panoramic Game & Watch) or they uses white LED's or light bulbs as a light source.
Check this video:
This is how it's done for the Takeshi's Castle game, the person rotates 90 degrees the polarise film sheet. =)
That's some really interesting info that I completely ignored, so thanks a bunch.
