Re: [Lcd4linux-devel] [lcd4linux] Sharp LM40001G LCD

[Ernst B. <e.b...@xe...>]

On Tuesday 05 September 2006 23:35, Till Harbaum wrote:
> Hi,
>
> 400*64 pixels is quite nice. Under lcd4linux this would basically
> be a 66*8 character display.
>
> > Maybe some of you also have interrest in a cheap size-DOES-matter Graphic
> > LCD, so we could share some of the development work.
>
> Don't get me wrong, but 22*3,5 cm this is not THAT big :-)

Well, sure, it doesn't compare to your LEDMatrix, but to be correct:
it has a 22.6x4.3 cm viewing area, which still beats the usual case-modders 
4x20 lcd hands down.

> > Interfacing it seems a bit of troublesome, as it doesn't contain a
> > framebuffer, so all data has to be sent continuosly.
>
> So does the ledmatrix display, so you might be able to do something
> similar to its driver. 400 x  64 is 25600 pixels which in turn is 3200
> bytes. This does not fit into the memory of any of the small avrs,
> so you either use a mega128 (with 4k ram) or use an external ram.

Yeah, probably some sram chip from an old '286 Mainboard, got plenty of those 
left.
Then probably a pic18f4550, maybe ATMega16.

With enough ram it would also be possible to implement two different greys.
Keep two framebuffers, display them alternating, keep one "on screen" a little 
longer than the other (If the display timings allow that)


> Ciao,
>   Till
>
> I just returned from the IFA fair and LG as well as the german Telekom
> hat some very funny presents: Small fans that have 7 leds on one of
> the two wings and display some text while running. I'd really love to
> build one of those and make a lcd4linux driver for them. DIY instructions
> for similar devices can easily be found with google when searching for
> led rotor display or similar. E.g.:
> http://hackedgadgets.com/2006/06/13/top-5-spinning-led-displays/

That "sounds" like a cool hack. Will probably be the loudest display ever 
connected to lcd4linux ;)


/Ernst