In brief, the One Wire interface uses a latched shift register in which the clock and the latch are taken from the data signal through two RC networks that produce the necessary delay. The ShiftRegLCD123 website from Raron used to give a lot of information as well, along with circuits, but that (the Wiki) seems to have disappeared. Also this article about one wire driving of a shift register is very informative Myke Predko is also a name that should not be unmentioned as pioneer in 1 wire LCD driving. His article is mainly PIC processor oriented, but it gives a good explanation of the principle. The one wire LCD interface has been around on the internet for some time already and made popular by Roman Black, although he claims he is not the inventor of the principle.
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