> Well, considering that actively "driving" a LCD segment involves passing > an AC field over it, in electrostatic drive, you could detect the > existence of AC or not on a segment, but you would have to "mask out" > that of other segments. On the other hand, you can expect a multiplexed > drive. An E-field detector as such would be able to pick up the shifts. > Wonders if the multiplexing is done by the same clock or a free-running > clock. If it is the same clock, just picking up the E-field from the > multiplex suffice to detect the clock ticking.
Magnus, That is indeed a clever idea. I'm sure the AC drive is derived from the same clock so if Jim can see the LCD segment/backplane waveform he's got a handle on the clock. When playing with watches a while ago I tried to pick up any 32 kHz signal but failed. Those with 1 Hz stepper motors were easy, but LED or LCD displays were too electro/magnetic/acoustic quiet for me to ever detect anything. Do you have suggestions on what sort of "antenna" to use to pick up the LCD AC E-field? I'd expect the LCD drive current to be vanishing small. /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
