[Gta04-owner] [Community] OpenPhoenux Prototype of GTA04 based7 inch tablet

Flemming Richter Mikkelsen quatrox at gmail.com
Thu Nov 8 11:30:27 CET 2012

On Nov 8, 2012 7:50 AM, "Dr. H. Nikolaus Schaller" <hns at goldelico.com>
> Am 07.11.2012 um 20:42 schrieb Flemming Richter Mikkelsen:
> > Since the display is so demanding, maybe a hardware display power
> > switch is in order?  That way one can boot without the display on.
> Or we could simply dim the backlight by software. But it does not solve
> the fundamental problem that the device will drain the battery even if
> connected to a power supply while being used.
> I think nobody would expect that it should be switched off/dimmed
> during charging and has limited operation time even if connected
> to the power supply. I.e. it does not work in picture frame mode...
> >
> > The backlight may be controlled by PWM, but may still demand a lot of
> > I was thinking USB 3.0 could solve the power issue.  We got lots of
> > extra space...
> > Or maybe just a normal power connector would be better since chargers
that talk
> > USB 3.0 is not easy to find. I know I would want to charge it at work,
> > at home and
> > from the car...
> I now understand why even small netbooks come with a 9V 2A supply.
> > I know some low power displayes, but they are either monochrome or
> > really slow (for ebooks) and with such a nice tablet it would be a
> > shame not to be able to watch videos.
> Exactly. I have studied the Pixel Qi 7 inch display but it has the same
> demand in full color mode. It appears to be a physical law that a
> sufficiently bright 7 inch display needs 1.5 Watt or more.
> >
> > Maybe also a bigger or double battery pack would help a little.
> Not really. It is the balance between power supply and demand.
> Only the difference can be used to charge the battery - independently
> of its capacity.

Sure.  I was not writing correctly.  I was thinking of battery time here...
any idea about operating time with display and CPU on max pwr?  Would 2
hours be possible?
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