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