Rockbox mail archiveSubject: Re: humongous lcds
Re: humongous lcds
From: Liberman Shachar <Road_Runner_at_barak.net.il>
Date: Sat, 19 Nov 2005 17:05:07 +0200
that was posted at _05:45 A.M_.
which = wish!
"Liberman Shachar" <Road_Runner_at_barak.net.il> wrote in message
> which i could do all that stuff. insufficient spare time.
> maybe someday. :)
> "ian douglas" <id_at_w98.us> wrote in message news:437D0F32.4000709_at_w98.us...
>> Liberman Shachar wrote:
>>> if you think there was a way to make a bigger remote screen work with
>>> the unit
>> By simply pulling some wires and splicing onto the existing circuitry,
>> I'd guess no. Again, the pins, wires and voltages needed to drive any
>> other screen will almost certainly be completely different than what's in
>> place to draw pixels on the existing screen. You would need something in
>> between (more than just wires) that understands what input signals
>> correspond to a drawing a particular pixel, and translate it to send
>> voltages to the appropriate pins at the appropriate voltage for the
>> appropriate length of time to draw one or more pixels on the bigger
>> If by change you find a bigger screen that uses the exact same graphics
>> instruction set that your H100 has, then you'll be one step closer, but
>> then you'll still need to worry about your next point:
>>> if threading 16 pixels to one result in over resistance of the unit and
>>> making it explode.
>> Yes, there's the likelihood that the output voltage of the H100 graphics
>> controller will not be sufficient, or perhaps too sufficient, to drive
>> the input pins on the new graphics controller too. You certainly wouldn't
>> want to draw on both screens at the same time, regardless if the new
>> graphics controller happens to be identical to the one in your H100 -
>> otherwise you're increasing the load (resistance) on the circuit, and an
>> increase in resistance means a drop in current at the same voltage, which
>> may impact other circuits on the board ... you probably know all that
>> One idea: if your H100 has some kind of output port, like a "remote" that
>> has a smaller LCD screen on it, maybe look at how the data is being sent
>> back and forth to that screen (scopes and analyzers work great for
>> capturing data signals like that), such as a signal that specifies "a
>> remote has been plugged in" and signals back like the artist name, song
>> title, etc., and use those as input/output signals to a totally different
>> circuit that manages the bigger screen and use the input signals to let
>> the new circuitry (microcontroller, flash memory, RAM, etc) know what to
>> write on the bigger screen. But developing a new board to do all of that
>> will cost hundreds of dollars I imagine?
>> Ian Douglas
>> blogs & photos: http://www.w98.us/
Received on 2005-11-19