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Help regarding lcd driving!!!!!!

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mandar_mahajan

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Hello All,
I am facing a serious problem & therefore wanted an immidiate help.

I am driving a 9 segment * 4 backplane with 89lpc936 & a shift register.
My supply voltage for controller is 3V & have kept 1.5v for backplanes.
My problem is that,
when I am putting the data for not glowing any digit as per the attach waveform(attach file), I am getting the dimming effect of the all segments which is unwanted. I am not able to understand how to eliminate this?
 

dick_freebird

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This may be due to waveform balance, if you are using a
scheme where your "zero" is the difference between two
highs or two lows (a common scheme from what I gather).
How about you attach a 'scope and look at differential
voltages in single-off vs all-off cases?
 

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