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'[EE]: Colour LCD screen'
2001\07\31@035109 by T.C. Phelps

picon face
Hi everyone,

I was given a small 3" (or so) colour display similar
to the ones in those handheld TVs. The problem is, all
the docs I was given are in Japanese! I've spent a lot
of time searching the net and have a vague idea of how
it works, but if anyone knows of any good references
on RGB inputs for LCD screens, voltage levels, timing
diagrams, anything really, I'd appreciate it.

Here's what I know about the screen:

The display has 9 inputs:

1 through 3: 10 - 20K variable resistor
4: Sync
5: Blue
6: Red
7: Green
8: +5 V
9: GND

The RGB inputs run off a Sony V7021 NTSC/PAL to RGB
decoder. I'd like to try running this display via a
PIC and perhaps a D/A converter (the RGB values appear
to be analog). Can anyone help? I can't find any info
on the RGB format or on "Sync" -- I thought there were
supposed to be two "Sync"s!!

Thanks,
Todd.

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2001\07\31@070547 by Alexandre Domingos F. Souza

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>Here's what I know about the screen:
>The display has 9 inputs:
>1 through 3: 10 - 20K variable resistor
>4: Sync
>5: Blue
>6: Red
>7: Green
>8: +5 V
>9: GND
>The RGB inputs run off a Sony V7021 NTSC/PAL to RGB
>decoder. I'd like to try running this display via a
>PIC and perhaps a D/A converter (the RGB values appear
>to be analog). Can anyone help? I can't find any info
>on the RGB format or on "Sync" -- I thought there were
>supposed to be two "Sync"s!!

       Todd, seems you never did any RGB interfacing at all! Do it this way: Since it came from a CASIO tv, it should be a CGA type of video (15.750 KHz). Get ArcadeOS in http://www.arcadeos.com and configure it to run in an arcade type monitor. It will make your PC run VGA in 15.750 KHz horizontal frequency. Just tie togheter the 2 sync wires (h and v) and connect to your small RGB panel. Of course you can use an old arcade board or a CGA board without any changes. This "one pin" of sync is nothing more than composite sync - H and V sync togheter.


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Alexandre Souza
spam_OUTtaitoTakeThisOuTspamterra.com.br
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2001\07\31@100314 by Olin Lathrop

face picon face
> 1 through 3: 10 - 20K variable resistor
> 4: Sync
> 5: Blue
> 6: Red
> 7: Green
> 8: +5 V
> 9: GND

1-3 is probably for adjusting the relative brightness of each of the colors.
The rest are most likely normal video signals, especially since you said
they were fed by some sort of composite video decoder chip.  I doubt you'll
hurt anything by feeding it normal AC coupled video signals.  If it looks
very dim, them maybe it's using 5V or something.  If anything is
non-standard, it will more likely be the sync levels.  These could possibly
be TTL levels instead of video levels.  Again, start with all the standard
signals and see if it works.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com

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2001\07\31@133934 by Timothy Stranex

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Hello,

Where can you get these sort of displays and what sort of price do they sell
them for?

Thanks,
Timothy Stranex
timot at btgnet dot co dot za

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2001\07\31@183601 by Mike Kendall
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Todd,
   Many times on RGB the sync is always on the Green signal.
Regards,
Mike
----- Original Message -----
From: "T.C. Phelps" <tcphelpsspamKILLspamYAHOO.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Tuesday, July 31, 2001 7:36 AM
Subject: [EE]: Colour LCD screen


{Quote hidden}

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2001\07\31@183808 by Mike Kendall

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A way to check to see if the sync is riding on the green is simple.  If you
disconnect a color such as green or blue, the display changes color.  If you
disconnect the green and the sync is riding on it (always the case on RGB
signals I've worked on), the entire display will disappear.  You might want
to verify that the impedance is 75ohms or a high input impedance also.
Regards,
Mike
{Original Message removed}


'[EE]: Colour LCD screen'
2001\08\01@084624 by Olin Lathrop
face picon face
> > 1 through 3: 10 - 20K variable resistor
> > 4: Sync
> > 5: Blue
> > 6: Red
> > 7: Green
> > 8: +5 V
> > 9: GND
>
> Many times on RGB the sync is always on the Green signal.

Almost certainly not in this case since there is a separate sync signal.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, EraseMEolinspam_OUTspamTakeThisOuTembedinc.com, http://www.embedinc.com

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2001\08\01@152339 by Mike Kendall

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Reason for mentioning the sync is that my experience is with monitors that
take both an external sync source or can use the sync riding on the green.
My recommendation is to connect the RGB first and see what happens, it can't
hurt.  As a matter of fact, I just installed one today by coincidence.  The
external sync jack was not used as there was a sync riding on the green
signal.  With the red or blue missing, color was off.  With the green
missing, display blanked out.  It will not hurt the display to incorrectly
connect the video signals, they will just look funny or not have a display.
On the particular RGB display I replaced today, there was a start up menu
allowing input for an analog, a digital, and a composite input.  Also, there
was a high impedance/75 ohm switch on the back.  The high impedance is used
with applications of video loop-thru to another monitor, and the 75ohm used
when it was the termination.  This was a large mil-spec AMLCD display that I
just described to you.  If you have a small low-cost unit designed for use
with a hand held TV, I would first look for a handheld TV that has a
similiar display.  I'd then look to see if an external video source from a
VCR can be connected to it just to satisfy my curiosity.  Maybe there is a
MIL-STD regarding the LCD display inputs as they all seem to be going that
way now.  The military standards are available on the internet.
Regards,
Mike
{Original Message removed}

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