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PICList Thread
'Graphical LCDs'
1995\10\30@093214 by Mike Goelzer

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       Parallax app note 5 talks about controlling an Hitachi LCD module.
The one they use is a character only LCD, though.  Has anyone tried to
interface a PIC to one of those graphical LCDs (like the ones in graphing
calculators)?  If anyone has done this, or knows of an app. note or
schematic I could find somewhere, I'd be very interested.

Thanks.

-mike
--
Mike Goelzer
<spam_OUTmgoelzerTakeThisOuTspamus.net>

1995\10\30@112606 by Paul Picot

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On Mon, 30 Oct 1995, Mike Goelzer wrote:

>         Parallax app note 5 talks about controlling an Hitachi LCD module.
> The one they use is a character only LCD, though.  Has anyone tried to
> interface a PIC to one of those graphical LCDs (like the ones in graphing
> calculators)?

I've had a look in several of these sorts of calculators, with the aim of
using the LCD for my own purposes.  Unfortunately, they all seem to bury
the LCD controller in the calculator microcontroller.  It would seem the
only way to use these LCDs is to use a similar microcontroller and
program IT.  It looks virtually impossible to use these as off-the-shelf
LCD units... the drive waveforms are decidedly non-trivial.

If anyone has a lead on small bitmap LCD's that aren't outrageous in
price, I'm sure a lot of people on this list would like to hear about them.

One off-the-wall idea is to use these small LCD televisions: they have OK
resolution (starting about 160x120?) and can take a standard serial
bitstream in ... ;-)  You can even do colour if you want to pay a bit more.

-Paul

1995\10\30@113035 by Mike Goelzer

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       The list server rejected this message the first time around (at
least, it sent me
a note saying that the message had been rejected) so I am sending it again.
If anyone gets this message twice, I apologize.

      Parallax app note 5 talks about controlling an Hitachi LCD module.
The one they use is a character only LCD, though.  Has anyone tried to
interface a PIC to one of those graphical LCDs (like the ones in graphing
calculators)?  If anyone has done this, or knows of an app. note or
schematic I could find somewhere, I'd be very interested.

-mike
--
Mike Goelzer
<.....mgoelzerKILLspamspam@spam@us.net>

1995\10\30@144423 by John La Rooy

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>
> I've had a look in several of these sorts of calculators, with the aim of
> using the LCD for my own purposes.  Unfortunately, they all seem to bury
> the LCD controller in the calculator microcontroller.  It would seem the
> only way to use these LCDs is to use a similar microcontroller and
> program IT.  It looks virtually impossible to use these as off-the-shelf
> LCD units... the drive waveforms are decidedly non-trivial.
>
I tried this with a calculator I bought for about $10NZ ($5US), it
had a 10 digit tilting display which meant it was connected to the board
via a nasty piece of flat ribbon instead of the even more nasty carbon
rubber connectors they usually use. By displaying all 8's, and
disconnecting one line at a time, I found that it had 3 backplanes.
I then connected it up to about 5 4094's and a bunch of resistors, worked
ok but a lot of work to get it going.


--
John

==============================================================
j_larooyspamKILLspamatlas.otago.ac.nz
Univeristy of Otago
New Zealand                     The early bird is for the cat
==============================================================


'GRAPHICAL LCDS'
1995\11\12@152738 by doug r. boulware
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PP> If anyone has a lead on small bitmap LCD's that aren't outrageous in
PP> price, I'm sure a lot of people on this list would like to hear
PP> about them.

I recently got a 480 X 128 LCD display from ALL ELECTRONICS (1-800-
826-5432) for $12.  It has drivers but no controller.  I was hoping to
build a controller from a PIC, but after getting the part and looking at
the specs, I decided the PIC was too slow.

The screen is divided into four quadrants, and each quadrent has a
serial data line.  The pixel data is clocked into the four serial lines
at around 1.2Mhz.  The spec sheet said the minimum clock frequency was
something like 1.08Mhz.

I ended up sending it back and asked to exchange it for a simpler
single line character LCD display, which also costs $12.  Haven't got it
yet.

Doug Boulware <.....dougrbKILLspamspam.....free.org>




* RM 1.3  *

1995\11\16@185535 by doug r. boulware

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PP> If anyone has a lead on small bitmap LCD's that aren't outrageous in
PP> price, I'm sure a lot of people on this list would like to hear
PP> about them.

I recently got a 480 X 128 LCD display from ALL ELECTRONICS (1-800-
826-5432) for $12.  It has drivers but no controller.  I was hoping to
build a controller from a PIC, but after getting the part and looking at
the specs, I decided the PIC was too slow.

The screen is divided into four quadrants, and each quadrent has a
serial data line.  The pixel data is clocked into the four serial lines
at around 1.2Mhz.  The spec sheet said the minimum clock frequency was
something like 1.08Mhz.

I ended up sending it back and asked to exchange it for a simpler
2 X 20 character LCD display, which also costs $12.  Haven't got it yet.

Doug Boulware <EraseMEdougrbspam_OUTspamTakeThisOuTfree.org>




* RM 1.3  *


'Graphical LCDs'
1997\02\18@152735 by Richard G. Thomas
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Hi

has anyone any experience with Hitachi graphical LCDs based on a HD61830B
controller, specifically a LMG7400?

At the moment we are trying to control it via a PC I/O card because we
thought it would be easier to do this rather than go straight to a PIC.

I'm sure I've used a similar screen with a 6502 but can't find the
program :-(

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