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How supply bias to this LCD?

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jigshaw

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Hello,friends

Recently I got a STN LCD from an old PDA (Sagem).Its product type number is G3246H-FE and there's no datasheet on the Internet.
So I used an oscilloscope to test waveshape on each pin and identifed the digital interface pins.
But its bias was different from STN LCD I ever met.I have used many LCD,every one with constant bias,but this one with changable bias as FR signal change.
Following picture is the bias signal I saw on the oscilloscope.
Can someone tell me how to give bias to this LCD?
Thanks a lot.


H3246H-FE bias Pin.GIF
 

titaniumobile

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what type of SAGEM ? perhaps you could get a user manual for it and identify the manufacturer of the LCD.
 

jigshaw

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I know it was made by citizen.
I suppose it was a customized product.
I found datasheets for H3243,H3244,H3245, but there was no H3246FE, none of these has the same interface configuration with this one.
I was confused by its bias supply, different from common ones that have constant bias voltage.
 

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