QVGA V/s VGA for GTA03 (was something about yummy CPU-GPU combos!)

Federico Lorenzi florenzi at gmail.com
Sun Jun 8 03:44:04 CEST 2008

IMHO: You can drive a VGA screen at QVGA, but you can't drive a QVGA
screen at VGA...


On Sun, Jun 8, 2008 at 2:16 AM, The Rasterman Carsten Haitzler
<raster at openmoko.org> wrote:
> On Sat, 7 Jun 2008 11:46:28 +0200 Michael 'Mickey' Lauer <mickey at openmoko.org>
> babbled:
>> On Friday 06 June 2008 20:07:01 Joerg Reisenweber wrote:
>> > Am Fr  6. Juni 2008 schrieb Flemming Richter Mikkelsen:
>> > > When it comes to GTA03, I will not buy one (because I buy the GTA02),
>> > > so I will not be the target. Maybe QVGA is a good solution, or maybe it
>> > > should be an option when you buy????
>> >
>> > If I got that right, we "just need to tune some of the LCD-driver settings,
>> > to get QVGA performance on a VGA screen"(OWTTE). So the ONLY argument for a
>> > QVGA screen is the marginal lower price (and it allegedly looks better than
>> > a VGA in QVGA mode which I don't understand) - but this would clearly be no
>> > bargain at all if we go for more expensive offer of "QVGA *OR* VGA option".
>> > Absolute nonsense, it costs 100 somecoin to replace the screen with a 30
>> > somecoin cheaper one 'on customer order'.
>> >
>> > I opt for VGA and give us a way to drive it QVGA whenever speed is a main
>> > concern (think someone said this before?). For GTA03 I'd prefer to have the
>> > SAME LCM as GTA02, just to reduce design risk. NO capacitive ts, NO QVGA
>> > LCD screen! :-/ Just my 2 cents from HW-dev
>> Full ACK. Once again, 03 is about evolution, not revolution.
> vga to qvga for gta03 is a drop-in replacement. same size, form-factor,
> manufacturer, etc. etc. - so as such it fits in with evolution. as it is a
> drop-in, it is a decision that can be changed easily (for at least a while).
> for now we have a vga screen on the gta03. i asked this after a talk with will
> and i wanted to gauge what people would really think about qvga. i'm fairly
> agnostic about vga vs qvga myself - i'm on the fence with it. i see the
> benefits both ways. if we could have i'd have liked an intermediate res (eg
> 480x272), but we won't.
> --
> Carsten Haitzler (The Rasterman) <raster at openmoko.org>
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