Re: Where to find LCM / system design info?

On Sun, 17 Jul 2005 00:34:47 GMT, the renowned Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

>Hello Spehro,
>
>> Understood. I can tell you that the modules with controllers tend to
>> be relatively expensive (more like tens of dollars rather than
>> dollars) in moderate and low volume, mostly because they are not
>> really used in high volume consumer products. If you really have high
>> volume, the problem becomes more difficult because there are more
>> options. You can easily find monochrome LCD displays that cost more
>> than a complete Gameboy Advance.
>
>IOW you can't really use an ordinary micro controller with a cheap
>graphics LCD? I mean a low pixel version like the OP suggested.

Required bit rates to serial drivers are pretty high, and there are
tight timing constraints. Say the refresh rate is 60Hz and there are
256 x 128 dots.. that's 2MHz/500KHz for bit/nibble-serial plus more
bandwidth for the row driver data). And 4K bytes of RAM, minimum,
which is more than most cheap micros have on board, total. In the
standard T6963 configuration, it takes 8 LSI chips to drive a 64 x 320
monochrome graphic display-- 4 T6A39 column drivers, 1 T6A40 row
driver, two SRAM chips and the controller itself.

>The driver in firmware is no easy feat but the number of available pins
>on a micro seems to be the limiting factor w/o an LCD controller if I
>understood you correctly.

Serial (more or less) so the pin count is probably not an issue unless
you need a load of pins to interface to external RAM.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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