Christopher, what you are saying makes sense. The screen must be on in some
way in order to use gestures. I know a couple people who have developed
apps. I'll run this by them. That doesn't mean they are experts on screen
curtain necessarily, but they might know a bit about it. It does no harm to
ask.

Thanks for your thoughts.

Neal

-----Original Message-----
From: viphone@googlegroups.com [mailto:viphone@googlegroups.com] On Behalf
Of Christopher Chaltain
Sent: Tuesday, April 09, 2013 7:53 PM
To: viphone@googlegroups.com
Subject: Re: Screen Curtain a battery saver, but effective?

What you're saying makes sense if the screen is actually turned off when the
screen curtain is on and requires less power than when the screen curtain is
turned off. I've heard though, that the privacy of the screen curtain is
handled by setting the background and the foreground colors to be the same.
I don't know how it really works, but if this were the case, you would not
see any battery savings. This is different then say my laptop running Ubuntu
where I can physically turn the monitor off and no power at all is being
sent to the monitor. Given that the screen on the iPhone is also a touch
screen, they obviously can't kill all power to it.

I run the screen curtain for privacy purposes. If it saves me battery power
then that's great. If people find that running with the screen curtain on
saves them some battery power then they should use the screen curtain. As I
said, I haven't noticed a big difference myself, but I go ahead and run with
the screen curtain on anyway.

On 04/09/2013 06:11 PM, Victor Gouveia wrote:
> While not having done as much extensive research as Neil, grin, my 
> brother, who is sighted, says that the screen curtain effectively 
> shuts off the display, while still making it sensitive to touch, so, 
> the less amount of light being emitted by the cell phone only stands 
> to reason that it would save battery life.
> Having said that, it's been my experience that my battery drops more 
> quickly when my screen curtain is off doing the exact same thing, as 
> when the screen curtain is on, so I guess in this respect, the 
> research I did was experiential.  Smiles.
> One can even take this a bit further using a laptop as an effective 
> means of understanding the concept.
> If one puts a laptop side to side with a screen-less note taker, one 
> finds that the note taker uses up it's battery life a great deal 
> longer than the laptop.  Even if using a laptop compared to a netbook, 
> especially those utilizing a solid state hard drive, the smaller 
> screen means less in the way of power needed to form the picture on 
> the screen, especially comparing the 17 inch screen laptop to the 
> minute 7 to 11 inch netbook screens.
> In conclusion, the less power you need to run something, the more 
> battery life you'll save.  At least that's been my experience.
> Victor Gouveia
> Vice-President
> Training Coordinator
> VIP Tech
> Tel: 1-(888)-737-1115
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--
Christopher (CJ)
chaltain at Gmail

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