Hi,
1: In my old school podium was always called dice. I don't think this is correct because dice don't have any closer meaning to podium. Right? The word you want is spelled 'dias'.
2: In a certain movie there was a small crystal screen attached to the upper side of podium. That screen was helping speaker with his speech, I mean he was able to see his written speech on that screen. That screen was almost transparent from audiences point of view. I think that movie was Dave. What do we call that screen? I'm not sure what it's called. 'A screen' sounds OK. I'd suggest 'a prompter', because it prompts him about his next words.
Best wishes, Clive