Smart LCD birght/dim...

Matt Manjos matt at manjos.com
Sat Apr 12 14:23:35 CEST 2008


I had a Compaq iPaq that did this via a little photodiode and it was
implemented well, but there are some times when you want a brighter
screen in the dark / darker screen in the daytime, so you're still
digging through menus.

On Sat, Apr 12, 2008 at 6:52 AM, Ortwin Regel <ortwin at gmail.com> wrote:
> Exactly my thoughts: This sounds way too complicated to actually be
>  useful. I'd rather adjust my brightness manually.
>
>
>
>  On 4/12/08, Nick Guenther <kousue at gmail.com> wrote:
>  > On Fri, Apr 11, 2008 at 8:50 PM, "Marco Trevisan (Treviño)"
>  > <mail at 3v1n0.net> wrote:
>  > > Since Freerunner won't have an hardware light sensor to set its LCD
>  > > brightness, I got some ideas about smartly changing the luminance of the
>  > > GTA02 screen to save its battery (still with an unknown life time :/).
>  > >  Of course they aren't and never will be precise as an hardware sensor is,
>  > > but it's the only thing we have:
>  > >
>  > >  1) Setting the brightness following the hour of the day: also if the
>  > phone
>  > > can't know if it's sunny or cloudy, neither if you're indoor or outdoor,
>  > > it's clear that just knowing the hour of the day, the date and your
>  > latitude
>  > > (to be set once via GPS) the phone can easily know when the sun will rise
>  > > and set, and so it will be possible increasing or reducing the LCD
>  > > brightness.
>  > >  Also if you're indoor, I guess that when the sun is "gone" you won't need
>  > > so much luminance...
>  > >
>  > >  2) Using personal profiles that follow your habits: you could define, for
>  > > each hour of each week day the "presumed" luminance, using something like
>  > a
>  > > calendar. I mean, if on working-days I generally stay indoor every day
>  > from
>  > > 8:30 to 13:00 and from 15:00 to the 19:00 I figure that on these intervals
>  > I
>  > > don't need all the LCD power, so I'll set in my "calendar" that on such
>  > > interval I'll be indoor...
>  > >  I guess that many of you would follow a routine durning the week, why
>  > don't
>  > > educate your phone for it!?
>  > >
>  > >  3) Setting the luminance following the weather. Of course I've no light
>  > > sensors, neither a barometer :P, but if I've a working connection
>  > available
>  > > I could use the weather data downloaded every few minutes (60, for
>  > example)
>  > > from internet to change my screen brightness (of course merging these
>  > > informations with points 1 and 2)
>  > >
>  > >  What do you think about them?
>  > >  I do think that they are really simple to implement, and that also if
>  > they
>  > > won't guarantee a perferct result, they could be a "smart" workaround.
>  > >
>  > >  --
>  > >  Treviño's World - Life and Linux
>  > >  http://www.3v1n0.net/
>  > >
>  >
>  >
>  > Or you could just... dim it after a few seconds and go blank after a
>  > minute like every other phone does. If we try to solve this by complex
>  > heuristics we're
>  > 1) going to get it wrong
>  > 2) going to end up wasting more battery in doing the computations than
>  > we save by them.
>  >
>  >
>  > -Nick
>  >
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