Large LCD...anyone know anything on this?

this is NOT mine, but i saw it on ebay, wondering if anybody has tried anything like this or knows how likely i would be to get it going with marginal knowledge.

http://cgi.ebay.com/5-Backlit-LCD-Dot-Matrix-Serial-Display-Screen-NEW_W0QQitemZ110509903987QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19bae75073#ht_3360wt_1602

Both datasheets for the chips listed as being on the back of the LCD are easily found with google; but like the seller says, nothing on the display itself. What is curious is that you can find “Plotech” (the company), but nothing mentioned on their site about the LCD. They seem to manufacture PCBs - so they might be just the board manufacturer or assembler for this LCD, and not the actual company who knows how they work.

Also curious - the seller lists a “model number”, but I don’t think that is the model number; he also shows two different PCBs with different silkscreening - I think one of the other numbers is the model number, and that might help the search for a datasheet, but they are difficult to read for the resolution he took them in (and in some views, they are blocked, or the contrast is wrong).

For instance; this number on the board seems to pull up info:

ew50107flyu

Also, “EDT” is “Emerging Display Technologies” - if you notice, this link shows that the above is the likely model number:

http://www.searchlighttech.com/searchResults.cfm?part=EW50107FLYU

Here’s EDT’s site - model numbers of current LCDs seem to match closely.

http://www.edtc.com/EDT/home/home.asp

If I were to buy this LCD, I would check those other numbers and such; I am sure it could be figured out (indeed, the above seems like a great start). I would also call or email EDT - find out if it is their part, and if they have an old specsheet lying around.

For reverse engineering it (if needed), I would grab those spec sheets, then take the LCD and using a scanner on its highest res setting, scan the back of the LCD PCB, then take the image and “trace” the PCB traces by filling them in with a new color, from the 14-pin connector to the chips.

Then I would verify everything using a voltmeter in continuity test mode. Any pins that weren’t traceable, I would ohm out again one at a time, via guessing and trying. Once I had a list of where I thought all the pins went to (ie, what parts or IC numbers and pins), I would pull out the datasheets and check them to see if they seem plausible for connections.

Then you could possibly start to work out how they work…

Hope this helps - good luck!

:slight_smile:

Those chips are really basic row and column drivers. It definitely appears that they need an external LCD controller to do the frame buffering and timing.

Well, I'm gonna probably kick myself later, but I just bought 2 of the buggers; maybe I can suss out what they are once I get them in my paws.

Damn - went a little redneck there, sorry.

What I meant to say is, with the datasheets and other information I have found, I will see if I can get them figured out - they are a pretty good deal if they can be made to work (and if they have a fast response time). Hopefully they are easy to work with and don't require a constant refresh cycle to operate (in which case, the Arduino may or may not be fast enough).

I will post here on this thread if I find anything once I get them; hopefully others will join in the search. I am kinda interested in a graphic dot-matrix LCD anyhow for use in building some simple test equipment (low power o-scope, maybe a small low-speed logic analyzer). Also just play with, too.

Those chips are really basic row and column drivers. It definitely appears that they need an external LCD controller to do the frame buffering and timing.

Yeah - that's what I am figuring (which is part of why I may kick myself) - here's the spec sheets:

http://www.datasheetcatalog.org/datasheet/sanyo/LC79430.pdf http://www.tstonramp.com/~pddwebacc/ics_app%20notes/sanyo/LC79401.pdf

Apparently (likely) the display is 640x240 (not a bad resolution, if it can be driven)...

According to this:

http://es.harvare.com/shop.php?partnum=EW50

This company has 80 of these LCDs (EW50107FLYU):

http://www.ec-electronics.com/

I am fairly certain that number -is- the model number. I have contacted them to see what information, if any, they may have. I have also contacted EDT for possible information.

We'll see what happens. Worst case is I have spent $35.00 on something I can't use immediately.

Another thing that is strange, is that the IDC connector of the ribbon cable seems to connect to 5 pins on one of the driver chips that seem to have to do with LCD data output (???) - that doesn't make much sense; I am not sure what to make of that at this moment (unless I have the chip mis-oriented or something).

:)

I don't see any sign of onboard RAM; that implies continuous refresh to me.

I just need somthing pretty basic, like the serial converters for the 4x20 boards you can get on several of the sites like modern device and such. If i can start out with bigger it'll just be mre fun in the end :D

First off.. I apologize for harvesting a few month old thread, but you'll see why in a minute.

I just acquired one of these used from my company and would love to see the thing up and running with my shiny new Arduino. I see above that people are saying it needs some sort of LCD driver, which i likely have. This screen came out of a fancy time clock and I have the motherboard that attaches to it as well. I am about 99% certain that the controller for this screen is the "Epson S1D13305F00b1". It is sitting right next to the LCD plug and online it says it's a LCD driver (I know.. a dead giveaway lol). The only issue is that this thing is surface mount and I'm likely to kill the chip if I touch it.

My question is.. how difficult do you guys think it would be to get this thing up and running with an arduino if perhaps a LCD driver shield of sorts was created that this LCD could plug directly into? (Please note: I am not experienced with electronics and the Arduino is the first hardware project I have ever touched other than simple relays and diodes).

Also, if there is anyone around here that is brave enough to try to make this work, I'd be willing to trade the screen and the "motherboard" that has the controller on it for anything that can be hooked to an arduino. I'd love to see it work with the Arduino and I know I'm not capable of it, so there's no point in it rotting in my closet.