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From: "Jim Kearney"
Subject: Re: 4096 colors STN LCD working ?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
NNTP-Posting-Date: Fri, 06 Dec 2002 21:06:23 GMT
Organization: AT&T Broadband
Date: Fri, 06 Dec 2002 21:06:23 GMT
>"fred bartoli" wrote in message
> So I don't understand how the full range of colors is achieved and digging
> through LCD controlers chips didn't give me the necessary infos.
> The only way I can see is by having the controler "duty cycling" the 3
> bits. This with the inertia of STN LCDs should do the trick.
> Am I right ?
Yes, 'frame rate modulation' is indeed how shades are generated on STN LCDs.
Cirrus and Sharp in particular have some documentation that you might find
When I implemented this in an FPGA last year, I found that the smearing and
dithering methods were absolutely critical to avoid 'beats' and 'waves' in
the display... it took some experimentation to achieve a display where both
large and small colored areas displayed well.
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