I have my own experience with LCD. So, it's hard to believe in such data. So, since you didn't provide link, I cannot rely on such statement. The power consumption of the LCD is based on many factors and the best results you can yield for a particular 1 sq.inch LCD is ~ 5uA using best power saving techniques and fine tuning. Without power saving tricks it would be about ~600 uA. Since even direct sun-light discharge LCD crystal segments, it is nearly impossible to provide stabile results (using polarized technology) not only for 0.4 uA, but even for 4 uA using voltage boost charge pump.
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