Hi Eric,
Actually it should be a Sine wave, this LCD film seems to be pretty sensitive to current, I tried PWM but this would also destroy the film.
What I’m exactly using for the screen are 5 by 5 inches individual squares of NPD-LCD film. This is the film used in privacy windows or Smart Glass , it’s also called 3G Privacy Film and it’s made by Scienstry, Inc.
specs:
Driving Voltage: 50 ± 5 V_AC, 50 – 60 Hz_
Current: 0.1 ( A/ m2 )
Energy Consumption: 5 ( Watt/m2 )
Response Time: < 0.2 ( Seconds )
Operational Lifetime: > 80,000,000 (Switching Times)
The Generation I’m using can be switched with 15v AC, but there is a newer generation that uses
0.05 ( A/ m2 ) of current and only 10V AC.
Thanks
F