Newsgroups: comp.robotics
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From: epklell@epk.ericsson.se (Lennart Lindell)
Subject: Re: Need LCD wiring - 16 wires
Message-ID: <1994Nov14.080024.6075@ericsson.se>
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Organization: EP Consulting Group AB, Karlskrona, Sweden
References: <NAHSHON.94Nov13120343@dan.haifa.ibm.com> <3a6f7m$da4@wumpus.cc.uow.edu.au>
Date: Mon, 14 Nov 1994 08:00:24 GMT
Lines: 43

In article <3a6f7m$da4@wumpus.cc.uow.edu.au>, pdunster@wumpus.cc.uow.edu.au (peter dunster) writes:
|> nahshon@dan.haifa.ibm.com (Itai Nahshon) writes:
|> 
|> >I found 40x4 LCD displays which come with a 16 wire connector. It looks
|> >like the wiring is different from the "standard" 14 wire connection
|> >(which is described on the LCD faq). The chips on the back are similar
|> >to another 20x2 display which has the standard 14 wire connection (just
|> >more chips).
|> 
|> >Thanks in advance,
|> 
|> >Itai Nahshon
|> >Haifa, Israel
|> >nahshon@vnet.ibm.com
|> >  
|> A couple of weeks ago I found the same thing while playing with a 40x4
|> LCD screen, the way to get it to work was to reverse the plug for the
|> normal 20x2 LCD's (although one pair of the control lines had to be swapped,
|> I can't remember which at the moment!) and one extra wire had to be run for
|> a new pin on the screen. It seems the 40x4 screens (at least this one) have
|> separate enables for the top and bottom halves of the screen, connecting them
|> together will write to lines 1 and 3 simultaneously!  BTW, how much are these

This give me an idea: 
The display RAM has a 7 bits address which gives 128 bytes, but 40x4 is 160.
Is it possible this display consists of 2 displays with 2x40 characters, each
with its own enable line?
Check this out and post the result!!

|> screens you found??
|> 
|> Cheers
|> Pete
|> =========================================================================
|> Dept. of Mech. Eng.                |Pete Dunster
|> University of Wollongong           |Tel     +61-42-213597
|> Northfields Ave                    |Fax     +61-42-213101
|> Wollongong                         |Email   pdunster@uow.edu.au
|> N.S.W. 2522  AUSTRALIA             |
|> =========================================================================


/Lennart
