Actually, those with vision report that if you turn screen curtain on in a darkened room you can easily see that there is light still on. Chris's explanation seems consistent with this observation.
On the other hand, I have had great battery life on my MacBookAir just keeping the screen brightness and keyboard brightness down to zero when using it on battery. This can be done by: turn the screen brightness down by pressing and holding the F1 key (increase brightness by pressing and holding F2) and decrease the keyboard backlight to zero by pressing and holding down the F5 key. To share my own experience, I can use my Air which is several years old now for about 4 hours on battery. I have not paid enough attention to my typical battery life on my iPod to make it worth trying to share that, though. HTH, Laurie -------------------------------------------- On Sat, 5/10/14, Glenn <[email protected]> wrote: Subject: Re: Screen curtain on iPhone To: "OS X & iOS Accessibility" <[email protected]> Date: Saturday, May 10, 2014, 11:41 AM Chris, I believe that the screen curtain turns off the back-light, thus making it black, like it is when there is no power to the phone. There is no "black" in terms of pixels, there are colored pixels that get back-light, or no light behind them, thus causing blackness. Glenn ----- Original Message ----- From: "Christopher-Mark Gilland" <[email protected]> To: "OS X & iOS Accessibility" <[email protected]> Sent: Saturday, May 10, 2014 10:33 AM Subject: Re: Screen curtain on iPhone Bryan, I might be wrong on this, so please don't quote me here, but if I am understanding things correctly, I don't think it saves battery life, and here's why more specifically: All that really happens notably when you enable the screen curtain is that it virtually paints a black shadening (if that be a word,) over the screen. Think of it like this: you have a pare of sunglasses. Now, if you was to take those and paint black paint over their lenses, that's basically in a nutshell what you're doing with the screen curtain. You're not really per sé making the screen power/brightness any less intense. You're basically just drawing solid black highlight over the top of it, thus, nulling/blacking it out. If you really want to truely increase your battery life, your better bet would probably be to go into settings, and turn the screen brightness all the way down to 0%. And no, doing that plus enabling the curtain really wouldn't probably have any ill effect, no, but I don't really think it would help matters either. Now, that said, your screen brightness certainly would make a huge difference. Chris. ----- Original Message ----- From: "Bryan Jones" <[email protected]> To: "OS X & iOS Accessibility" <[email protected]> Sent: Saturday, May 10, 2014 11:13 AM Subject: Re: Screen curtain on iPhone Yes, I’ve heard this anecdote from a number of different folks over the years. Unfortunately, AFAIK none of these folks have produced any hard evidence to show that turning the screen curtain on actually increases battery life. I’d love to see a controlled and replicable study to either prove or disprove the assertions of those of us including Apple who believe there’s no difference in battery life with or without screen curtain. Bryan On May 10, 2014, at 10:33 AM, Glenn <[email protected]> wrote: > I exclusively use the screen curtain, and the battery life on my phone > exceeds expectation. > I use the iPhone 5 with the latest update, and apps update automatically, > and my bluetooth and WIFI are always on. > Glenn > ----- Original Message ----- > From: "Bryan Jones" <[email protected]> > To: "OS X & iOS Accessibility" <[email protected]> > Sent: Saturday, May 10, 2014 9:27 AM > Subject: Re: Screen curtain on iPhone > > > Last I heard, the official word from Apple Accessibility was that the IOS > screen curtain has no effect on battery life. BTW, though I’ve done no > official testing, my personal experience leads me to believe this also > holds > true for the MacOS screen curtain on Macbooks. > > Bryan > > On May 10, 2014, at 9:45 AM, Glenn <[email protected]> wrote: >> I would think that screen curtain being on would save more battery life, >> as >> I'm sure that even when it is set to zero, display processes are still >> being >> sent to the screen, and when screen curtain is on, I'm guessing that the >> processes are not calculated by the processor. >> Glenn > <--- Mac Access At Mac Access Dot Net ---> > > To reply to this post, please address your message to > [email protected] > > You can find an archive of all messages posted to the Mac-Access forum > at > either the list's own dedicated web archive: > <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> > or at the public Mail Archive: > <http://www.mail-archive.com/[email protected]/>. > Subscribe to the list's RSS feed from: > <http://www.mail-archive.com/[email protected]/maillist.xml> > > As the Mac Access Dot Net administrators, we do our very best to ensure > that > the Mac-Access E-Mal list remains malware, spyware, Trojan, virus and > worm-free. 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However, this should in no way replace your own security strategy. We assume neither liability nor responsibility should something unpredictable happen. Please remember to update your membership preferences periodically by visiting the list website at: <http://mail.tft-bbs.co.uk/mailman/listinfo/mac-access/options/> <--- Mac Access At Mac Access Dot Net ---> To reply to this post, please address your message to [email protected] You can find an archive of all messages posted to the Mac-Access forum at either the list's own dedicated web archive: <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> or at the public Mail Archive: <http://www.mail-archive.com/[email protected]/>. Subscribe to the list's RSS feed from: <http://www.mail-archive.com/[email protected]/maillist.xml> As the Mac Access Dot Net administrators, we do our very best to ensure that the Mac-Access E-Mal list remains malware, spyware, Trojan, virus and worm-free. However, this should in no way replace your own security strategy. We assume neither liability nor responsibility should something unpredictable happen. Please remember to update your membership preferences periodically by visiting the list website at: <http://mail.tft-bbs.co.uk/mailman/listinfo/mac-access/options/> <--- Mac Access At Mac Access Dot Net ---> To reply to this post, please address your message to [email protected] You can find an archive of all messages posted to the Mac-Access forum at either the list's own dedicated web archive: <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> or at the public Mail Archive: <http://www.mail-archive.com/[email protected]/>. Subscribe to the list's RSS feed from: <http://www.mail-archive.com/[email protected]/maillist.xml> As the Mac Access Dot Net administrators, we do our very best to ensure that the Mac-Access E-Mal list remains malware, spyware, Trojan, virus and worm-free. 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