Apple officially told me, on more than one occasion, that the screen curtain does not turn off the backlight. It merely adjusts the background and foreground colours to black. So, the only benefit to power savings is that the display is no longer making rapid alterations to match the requirements of running apps. Depending on the app, this can be a fairly substantial battery savings. If you do not want the power drain from the backlight, turn your screen brightness to 0.
David Chittenden, MSc, MRCAA Email: dchitten...@gmail.com Mobile: +64 21 2288 288 Sent from my iPhone On 10/04/2013, at 13:08, "Neal Ewers" <neal.ew...@ravenswood.org> wrote: > 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 >> Fax: 1-(888)-737-1116 >> vipt...@rogers.com <mailto:vipt...@rogers.com> >> victor.gouv...@rogers.com <mailto:victor.gouv...@rogers.com> >> Limiting Disabilities with Limitless Possibilities >> >> -- >> You received this message because you are subscribed to the "VIPhone" >> Google Group. >> To search the VIPhone public archive, visit >> http://www.mail-archive.com/viphone@googlegroups.com/. >> To post to this group, send email to viphone@googlegroups.com. >> To unsubscribe from this group, send email to >> viphone+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/viphone?hl=en. >> --- >> You received this message because you are subscribed to the Google >> Groups "VIPhone" group. >> To unsubscribe from this group and stop receiving emails from it, send >> an email to viphone+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> > > -- > Christopher (CJ) > chaltain at Gmail > > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > To search the VIPhone public archive, visit > http://www.mail-archive.com/viphone@googlegroups.com/. > To post to this group, send email to viphone@googlegroups.com. > To unsubscribe from this group, send email to > viphone+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/viphone?hl=en. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to viphone+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > To search the VIPhone public archive, visit > http://www.mail-archive.com/viphone@googlegroups.com/. > To post to this group, send email to viphone@googlegroups.com. > To unsubscribe from this group, send email to > viphone+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/viphone?hl=en. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to viphone+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the "VIPhone" Google Group. 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