I'm trying to attach my LCD screen from my PDA to be able to play a live feed on the screen with my webcam.
What will I need to be able to do this?
If you could help me that would be great.
Not likely! You'd need something to snoop the USB traffic, understand the device driver (very advanced) or design a device driver for the LCD so the PC could sent it a feed (also very advanced). Just building a controller for that LCD is a big, advanced job. It's not like analog baseband video where you can just split off a signal and splice in a TV set or VCR.