I would put the screen brightness to 0 then adjust it where necessary.
Screen curtain only puts a virtual curtain around your screen and
doesn't affect how it contrasts.
On 10/05/2014 10:48, Paul Hopewell wrote:
Hello,
I am concerned about battery life on my ageing iPhone 3GS running the latest
level of IOS 6 (IOS 7 does not work on the 3GS).
I know that reducing screen brightness increases battery life. If I set screen
curtain on does that have the same effect as setting screen brightness to 0? If
I set brightness to say 40% and normally run with screen curtain on I can
easily toggle screen curtain off to show the phone content to a sighted person.
However if normally setting screen curtain on in this scenario does not improve
battery life then there is no point in doing this. Instead I would have to run
with screen brightness normally set to 0 and to remember to temporarily
increase screen brightness to show the phone to a sighted person.
Many thanks.
Paul Hopewell
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