Re: uC and LCD (or uC and LCD controller) interfacing

On Tue, 21 Aug 2007 08:54:15 -0700, linnix wrote:

On Aug 21, 7:15 am, Tim Wescott <t...@xxxxxxxxxxxxxxxx> wrote:
On Tue, 21 Aug 2007 03:58:34 -0700, Ajab wrote:
Can anyone give me any application notes/links which will help me to
understand the uC and LCD (or uC and LCD controller) interfacing ?

Have you done web searches?

An LCD segment turns dark (or light) when you apply voltage, and will get
stuck that way if the voltage stays on. So an LCD controller applies a
square wave to the segments you want to turn on -- that's a big part of
the reason you need a controller instead of just logic and some resistors.

Actually, you can do it with logics and DC/DC converters. I am
driving an LCD panel by toggling port pins only, but it's using up all
the micro processing power. So, in theory, you can build an LCD
controller with standard CPLD, FPGA or ASIC. For high volume, ASIC w/
dumb uC might be cheaper than LCD uC.

There are dedicated LCD controllers out there, both big and little. I'm
currently using a small graphics LCD panel; the only data *** I refer to
is the one for the driver. That ought to be even cheaper than an ASIC for
all but the highest of volumes.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
.