Mystery LCD

Guest
Hey everyone!

I've got this random LCD screen that I'd like to use in a project but I
can't find out any useful information on it. The only markings on it
are:

WU524A-01 TG2071
0501BJB*427/05/02/21 02

CMF-TG2071UNSR-W-01 D0511

The bottom line, which I'm assuming is the part number, is in bold
text. The LCD itself is 150mm x 40mm and is amber backlit. The only
connections to it are a 15 conductor ribbon and power for the
backlight.

Has anyone seen this display before?

Thanks
--
Elliott
 
spamfilter@eep.burdell.org wrote:
Hey everyone!

I've got this random LCD screen that I'd like to use in a project but I
can't find out any useful information on it. The only markings on it
are:

WU524A-01 TG2071
0501BJB*427/05/02/21 02

CMF-TG2071UNSR-W-01 D0511

The bottom line, which I'm assuming is the part number, is in bold
text. The LCD itself is 150mm x 40mm and is amber backlit. The only
connections to it are a 15 conductor ribbon and power for the
backlight.

Has anyone seen this display before?

Thanks
--
Elliott
Click to expand...
What's the chip?
There's a semi-standard interface for the HD44780 but it's 14 pins.
I don't know what to tell you about the 15 pins.
There are a number of webpages that talk about interfacing LCDs to PIC
processors...and probably others. They'll have the details of the
14-pin interface and how to drive it.

If your luck is like mine, you've got bare chips on board covered with
black goop and not a chip number in sight...
mike

--
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ht<removethis>tp://www.geocities.com/SiliconValley/Monitor/4710/
 
I don't see any chip that is directly associated with the LCD, and I
can't find any chips mounted on the LCD itself ... the only chip is the
one on the unit which is an Atmel ATmega128L. I don't want to destroy
the LCD trying to pry the back off to find the controller chip...
 
On 15 Jul 2005 13:59:54 -0700, the renowned spamfilter@eep.burdell.org
wrote:

I don't see any chip that is directly associated with the LCD, and I
can't find any chips mounted on the LCD itself ... the only chip is the
one on the unit which is an Atmel ATmega128L. I don't want to destroy
the LCD trying to pry the back off to find the controller chip...
Click to expand...
Maybe it's a COG (chip mounted directly to the glass) LCD.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Elliot,
The standard interface (sort of standard anyway) is pwr,gnd,contrast,3
lines for control (E, RS, R/W), and 8 bits of data. I have a unit that
has 16 pins but the extra pins are unused. I have the data sheets
(PDFs) for both the HD44780 and a Samsung version (KS0072) that uses
the same intruction set. Email me if you want either or both. Without
the right intructions you can't get an HD44780 or compatible to do much
of anything since you have to send the right command sequence to
initalize them.
Glenn Pavlovic
 
Your LCD may be made by Truly Semiconductors in China. One of their
distributors in the USA, All American Direct, carries another LCD with a
part number that starts with "CMF-TG" and lists Truly as the manufacturer.

Long Link to All American's listing of LCD with CMF part numbers:
http://www1.allamerican.com/direct/Results.asp?id=&WHAT=NUM&WTYPE=S&W1=CMF&W2JOIN=OR&W2=&MFG=&show=10&search+now.x=0&search+now.y=0

Link to Truly USA:

www.trulyusa.com/lcd/

Link to Truly in China:

http://www.truly-lcd.com.cn/

--
Chuck Wozniak

spamfilter@eep.burdell.org wrote:

WU524A-01 TG2071
0501BJB*427/05/02/21 02

CMF-TG2071UNSR-W-01 D0511

Has anyone seen this display before?
Click to expand...
 
After some more investigation tonight, it looks like Truly is in fact
the manufacturer; I was never able to get any more information off the
LCD itself but I did peel back some tape on the ribbon cable and saw
"Truly" printed on it with some another part number (TG400) that is
similar to the one on the LCD.

It's definitely 16 pins (I mean it this time!) - two are ground, one is
perhaps contrast of some sort (it appears to be connected to ground
through a parallel resistor and capacitor). The remaining 13 pins are
connected to the Atmel chip as follows:

3 to PortD
2 to PortG
8 to PortC

.... so if there are three bits for control (say to PortD), 8 bits for
data (say PortC), that only leaves two remaining unknowns. It's a good
start, I guess. Too bad I can't get at the program on the Atmel
chip...

At first glance, the Truly web sites aren't all that helpful, but I'll
try to dig in a bit deeper tomorrow.

Thanks
--
Elliott
 
On 17 Jul 2005 19:37:54 -0700, the renowned spamfilter@eep.burdell.org
wrote:

After some more investigation tonight, it looks like Truly is in fact
the manufacturer; I was never able to get any more information off the
LCD itself but I did peel back some tape on the ribbon cable and saw
"Truly" printed on it with some another part number (TG400) that is
similar to the one on the LCD.

It's definitely 16 pins (I mean it this time!) - two are ground, one is
perhaps contrast of some sort (it appears to be connected to ground
through a parallel resistor and capacitor). The remaining 13 pins are
connected to the Atmel chip as follows:

3 to PortD
2 to PortG
8 to PortC

... so if there are three bits for control (say to PortD), 8 bits for
data (say PortC), that only leaves two remaining unknowns. It's a good
start, I guess. Too bad I can't get at the program on the Atmel
chip...

At first glance, the Truly web sites aren't all that helpful, but I'll
try to dig in a bit deeper tomorrow.

Thanks
Click to expand...
Chances are that it's a standard HD44780-type interface if it is a
small character type display module. As others have said, there are
basically 14 pins, but sometimes two more in line that have to do with
backlight optionally (and sometimes the backlight can be brought out
there or to separate pins on some Truly displays). We used a whack of
them about 7 or 8 years ago but had some problems with them.

Anyway, look for info on that interface and you'll find lots of data
for that chip and compatibles. Also code examples that are probably
full of bugs.

It sounds like they are using 8-bit data interface (many applications
use 4-bit mode). It also sounds like they are powering the LCD from a
port pin,if your tracing of the circuit is correct. Perhaps the
contrast pin is being driven by a PWM output with a low-pass filter.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Can you get the LCD to function in the current equipment? If so, does it
appear to only display only text characters in fixed positions or can it
display different sized characters and/or larger graphic elements?

If you can not get the display to function can you tell if the active
pixel area consist of evenly spaced dots or if the dots are is small
blocks (of maybe 5x8 dots) with gaps between the blocks? You can usually
see the dot pattern while slowly rocking the display back and forth
under a strong light.

Just trying to figure out if your display is a character module or a
small mono graphic display. A character module may be fairly easy to
figure out. A graphic module may be a bit tougher to figure out if uses
a combination controller/driver IC.

When you say "ribbon cable" are you referring to a cable made up of some
type of bonded round wire cables or flex printed circuit cable?

FYI, I work for an LCD marketing and distribution company but not
related to to Truly in any way.

--
Chuck Wozniak

spamfilter@eep.burdell.org wrote:
After some more investigation tonight, it looks like Truly is in fact
the manufacturer; I was never able to get any more information off the
LCD itself but I did peel back some tape on the ribbon cable and saw
"Truly" printed on it with some another part number (TG400) that is
similar to the one on the LCD.

It's definitely 16 pins (I mean it this time!) - two are ground, one is
perhaps contrast of some sort (it appears to be connected to ground
through a parallel resistor and capacitor). The remaining 13 pins are
connected to the Atmel chip as follows:

3 to PortD
2 to PortG
8 to PortC

... so if there are three bits for control (say to PortD), 8 bits for
data (say PortC), that only leaves two remaining unknowns. It's a good
start, I guess. Too bad I can't get at the program on the Atmel
chip...

At first glance, the Truly web sites aren't all that helpful, but I'll
try to dig in a bit deeper tomorrow.

Thanks
--
Elliott
Click to expand...
 
Sorry, I thought I had mentioned this earlier but I guess I didn't.
The display is a dot-matrix display and it can show text of various
sizes, other character symbols (i.e. level bars), and graphics (logos
and such). Amber backlit but monochrome.

By ribbon cable I mean one of those flat amber-colored (mylar?) strips
with copper tracks (I guess this is the flex printed circuit cable).
It plugs in to the PC board, then expands and has several surface mount
devices (I didn't peel back the tape cover far enough, but I'm guessing
they're resistors).

I sent an e-mail to Truly USA but based on past experiences with this
sort of thing I'm not expecting much.
 
I would say that pretty much eliminates the discussion thread on the
standard interface for a character module with an HD44780 controller.

I know someone who has a friend that works for All American. I'll pass a
message along to see if that friend ever heard of your LCD.

--
Chuck Wozniak

spamfilter@eep.burdell.org wrote:
Sorry, I thought I had mentioned this earlier but I guess I didn't.
The display is a dot-matrix display and it can show text of various
sizes, other character symbols (i.e. level bars), and graphics (logos
and such). Amber backlit but monochrome.

By ribbon cable I mean one of those flat amber-colored (mylar?) strips
with copper tracks (I guess this is the flex printed circuit cable).
It plugs in to the PC board, then expands and has several surface mount
devices (I didn't peel back the tape cover far enough, but I'm guessing
they're resistors).

I sent an e-mail to Truly USA but based on past experiences with this
sort of thing I'm not expecting much.
Click to expand...
 
The response from Truly USA was:

"We are sorry that we cannot provide any support on this LCD since this
is a Custom made OEM LCD."


So ... probably out of luck there. Eh.
 
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