YOu can just leave teh display driver as it is, and hook up the mostt significant bits of the lcd to the 6 bits of data. This just means that you won't have those lower few bits set to anything meaningful. you might want to tie themlow on the display so that they are driven off all teh way when the lcd display is trying to display black.

You loose a little bit of dynamic range in your colors, is all.

Rick


On Thu, Aug 27, 2009 at 12:44 PM, danja vasiliev <danja@k0a1a.net> wrote:
hi Richard, thanks a lot for such a thorough explanation of things.
indeed looking at the kit version of the screen that comes with gumstix
seems like a logical way of exploring this lcd mystery territory.
so i will do when i receive my pack.
i will report back here about my findings and will all many more
questions before i have any (findings) ;)

for now i'm wondering how would i deal with 8bit vs. 6bit vs. 3bit color
displays? obviously there are less electrical lines between the screen
and the board, but what about the driver? does it need to be
reconfigured to have less color bits?

chrz,
danja

richard dorfner wrote:
> There are TONS of interfaces to LCD panels.  Some take commands, some
> take raw video data, some take NTSC some take VGA style signals, some
> take analog, some take digital. So, start by finding out what the panel
> that they sell uses..
>
> http://pubs.gumstix.com/documents/Displays/LTE430WQ-F0C_PI_Rev001_GENERAL.PDF
>
> is the link to the PDF for that particular display for the lcd-16vx
> board which is sold to work with the verdex.
>
> Within that document, you will find a few interesting things, one of
> which is a table with the pin out for the connector and allll the
> display signals that it needs, including a horizontal sync, vertical
> sync and 8 bits each of R G and B data.
> So, it looks like it's a digital interface with video data, and
> horizontal and vertical syncs.
>
> and at .. what, 480 by 272, it is a bit of an oddball, it's not 320 by
> 240 which is qvga, it's not 640 by 480 which is vga, so it's an oddball
> size.  You could TRY a 640 by 480 display and then try doinking around
> with the x11 display settings file which specifies the screen
> resolution.. However, I thik I would tend towards finding that part of
> the system first, seeing what things you CAN change, and then deciding
> if I wanted to risk spending the money on a different resoluion lcd
> display afterwards.
>
> At any rate, that document link will point you to the hardware interface
> of the LCD display, from there, you will have to match the interfaces
> between contending LCD modules.
>
> I hope this helps, however, your mileage may vary.
>
> Rick
>
>
>
> On Tue, Aug 25, 2009 at 1:21 PM, danja vasiliev <danja@k0a1a.net
> <mailto:danja@k0a1a.net>> wrote:
>
>     hi there,
>     could you help me out with choosing the right LCD panel to interface
>     with vertex board? i'm looking in to small panels but confused by the
>     range of different interfaces - parallel, cmos, spi.
>     what would be less troublesome to implement using breakout-vx board and
>     available drivers?
>
>     any input is very much appreciated!


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