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Looking for information on Toshiba LCD

Posted on 2004-04-07
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Last Modified: 2013-12-10
I recently several business phones, the type made to connect to internal phone systems.  Since I don't think it's possible to make them work on a regular phone system, I was wondering if I could use the LCD display out of them and mount it in my computer, a project I've wanted to do for awhile now but haven't had the money to get a decent LCD.

I've read a fair bit about these projects, and searched on google for the information, but I can't seem to find out anything about this LCD, most importantly a data sheet or pinout for it.  Hopefully someone here can help me find this.

The phone is a Toshiba Model EKT6520A-SD, v.1A.

The LCD itself has 18 pins plus a seperate ground wire.  I'm not sure how many characters or lines the screen has, or if it is a dot matrix type, since I haven't seen it in use.  The screen area measures 6.5 cm x 1.5 cm.  It has 3 buttons on the side which are labeled on the casing as scroll, page and mode.

The PCB is labeled Toshiba TLC-492A.  There are two chips on the back.  One had a sticker which read Toshiba TLC-2492B.  Underneath the chip is actually labeled HD44100H, which is similar to the model I have seen in most of the LCD parallel port interface guides, but may or may not be compatible.  The other chip is labeled Toshia T7934.

Any information anyone can dig up about this LCD is greatly appreciated.  I really need information about it's pinout and interfacing it with the computer.  Finding out its capabilities would also be useful.

Thanks
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Question by:grantemsley
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Expert Comment

by:alexgreen
ID: 10781418
if you can get power to it you may be able to adjust pins like jumpers to investigate what lines etc, i did the same with an led type display. sorry no more info!
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Expert Comment

by:HippyWarlock
ID: 10781853
Me too, hours of endless fun. Keep the volts low, start at around 3v and work up. You'll probably see one or more pins grouped seperately (though by no means always, ref back to fun comment) these will/may could be common pins..........err.... I'm not being too precise here am I......


The HD44100H (Hitachi) are 40 segment drivers for driving the columns.

The HD66100F description segment driver with 80 LCD drive circuits is the improved version of your no longer current HD44100H LCD driver, however, if you waddle off to here:
http://www.pacificdisplay.com/ics_app%20notes/hitachi/HD66100F.pdf
You'll find the datasheet for the new and improved jobby, who knows you may be able to use some of the info.

The T7934 (appears to be a column driver) DOT matrix LCD controller and driver LSI Datasheet:
http://www.chipdocs.com/pndecoder/datasheets/TOS/T7934.html

look here too - other datshts etc:
http://www.datasheetcatalog.com/catalog/83560.shtml


This group may interest you too, more than we will :-)
http://forum.microchip.com/tt.asp?forumid=38

Good start points into a project:
http://www.sxlist.com/techref/io/lcd/44780pc.htm
http://ee.cleversoul.com/lcd_project.html



hth
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Author Comment

by:grantemsley
ID: 10785468
I followed the traces and found out that the first four pins connect to the buttons, which leaves 14 pins left for the LCD and power, plus that ground wire.

Seems I've got a lot of research on LCDs to do now :).  
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LVL 1

Author Comment

by:grantemsley
ID: 10786121
Seems I also have the pins backwards, since my pin 1 is labeled on the main phone board as pin 18, so I have to rewrite my notes.  Pins 15-18 are for the buttons.

Pins 1 and 2 are partially shorted, 300 omhs resistance.  Pin 2 is partially shorted to 3 through 14, about 600 omhs.  3-14 have no connection to each other.

I tried applying power to pins 1 and 2, but it didn't do anything...maybe it needs something to display.
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Author Comment

by:grantemsley
ID: 10787641
After doing more searching, I believe I've found that this LCD doesn't have the necessary controller to use for this product.  Unless someone can some up with some information to the contrary, I think I'm going to ask that this question be closed, since I found this answer myself.
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Expert Comment

by:Callandor
ID: 10789103
Matrix Orbital manufactures LCD and VFD displays for pcs.  They might give you clues into how the devices work.
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Expert Comment

by:alexgreen
ID: 10789398
no objections here!
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