Thanks for the clarification oldtecho.
Am i correct in saying that with an interlaced display, only half of the available lines that make up a full frame are displayed at a time, hence the flicker with interlaced?
So for example for 720i, two "fields" of 360 lines that make a frame are displayed sequentially?
And if this is the case, i need to change the term "frame" to "field" in some instances of my explanation?