What decides the Mono LCD gray scale?

From: cool_harber (cool_harber_at_hotmail.com)
Date: 12/28/04 

Date: Tue, 28 Dec 2004 22:10:00 +0800

The mono lcd`s gray scale is decided by lcd controller or lcd itself?
I have a mono lcd with 4 data pins and about 70 Hz frame frequence ,I
want to use PXA255 to controll it.Do I get 256 scale gray?
Any suggestion is appreciated.

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