No one likes Otronas?

From: Peter C. Wallace <pcw_at_mesanet.com>
Date: Mon Feb 11 18:23:47 2002

On Mon, 11 Feb 2002, Tony Duell wrote:

> >
> >
> >
> > Doc wrote:
> >
> >
> > > The 8"-9" lcd screens from 486-era laptops come to mind.
> > >
> > > Doc
> > Are they hard to interface to? do you send them
> > video?
>
> Not quite the same thing, but I was looking at the signals going to the
> display in the HP110 and 110+ last night. These machines have
> dot-addressable monochrome displays. There are 11 wires :
>
> 3 power : Groumd. +5V, -8 to -13V (depending on the contrast setting)
>
> 4 clocks :
> a) What looks like a dot clock or data strobe
> b) Possibly start-of-line sync
> c) Possibly start-of-frame sync
> d) What looked to be an LCD backplane drive clock
>
> 4 data lines. No idea (yet) on what the data means, but these pins did
> not have regular clock-like waveforms on them.
>
> Probably not trivial to drive. HP used a custom chip in the 110 (with an
> 8K*k SRAM alongside it) and a different custom _hybrid_ in the 110+ (a
> similar custom chip and 2 8K*8 SRAMs in the same package).
>
> -tony
>


Probably just a standard 4 bit mono LCD interface:

4 data bits (4 pixels in a horizontal line)

clocks: (from highest to lowest freq)

CL2 = data clock - each clock clocks in 4 pixels
CL1 = line sync - like hsync
FLM = first line marker - like vsync
M = backplane AC

M is usually a slow square wave

Actually they are pretty simple to drive...

Peter Wallace
Received on Mon Feb 11 2002 - 18:23:47 GMT