I got my replacement unit yesterday (screen lift on an 8GB model) and decided to check the white balance out of curiosity.
I used the Flashlight app from flash-the-brain, which offers a full range of brightness values, though without any numbers to go with them, so the actual brightness is only approximate. I used a Spyder 2 colorimeter (old and slow, but produced readings in line with a newer iDisplay I borrowed a while ago) and the monitor WB pre-calibration mode from my calibration software. Readings were taken where the measurement stabilised, and I generally waited around 30secs to be sure.
100%: 6305
90%: 6225
80%: 6187
70%: 6210
60%: 6235
50%: 6243
40%: 6252
30%: 6212
20%: 6034
10%: 6292
The dip at 20% was reproducible. Below 10% it was impossible to get a stable reading, probably because of light leakage along the glossy screen.
I've calibrated quite a few monitors over the years, and these numbers out-of-the-box are pretty damn good IMHO. But there's no guarantee this will have any relation to the white-balance on other displays.
[Note: For those who aren't into screen calibration, the numbers are all supposed to be 6500K. LCD screens typically vary from this number, in some cases by thousands of Kelvin]
Good data, what color did you use, white? Have you tried a few tones of grey to see how it handles the LCD color but consistent backlight? ie: Leave backlight at whatever is reasonable, 75%, higher? And adjust the background tone.
Not sure if that app will let you do that, but you could create a few png's and view them in JustPictures.
I just used a flashlight app with adjustable colour - the numbers on the left are approximate grey values. The actual backlight intensity remained the same throughout.
Related
I still own an HP iPAQ. Granted it's getting on a bit but I can do everything the Orange SPV M2000 (Blue Angel) can, except make phone calls. It was a great little device and one of the best things about it was the battery lasted ages.
Granted it doesn't have to keep polling the radio signal every few seconds but there is one way I think that battery performace could be improved and that's by making the screen less bright.
Right now I find the screen is way too bright at night. I play games and read on it in bed.
Is there any way of programatically making the brightness levels finer grained? WM5 has 10 graduations whereas the iPAQ has about 30.
Through this one change alone, I know I could get about another 2/4 hours usage out of my Blue Angel.
Anyone (Helmi?) know if this is possible by simply increasing the number of divisions in the brightness slider?
Isn't this just a change of a variable in the code or does the hardware fundamentally not allow it?
Looking though the registry there is a reg value for the brigtness levels at..
HKEY_CURRENT_USERS/ControlPanel/Backligh/
[ACBrightNess] and [BrightNess]
At default, the maximum value of the BrightNess settings can be 10, the lowest 1, with any other number higher or lower apparently turning off the brightness. You can adjust the scale of the brightness levels, so you can have 30 diffrent levels of controll by editing the [DefaultACBrightNess] and [DefaultBrightNess] values to 30, but this doesn't work too well on my device and value 1 is just as bright as it was before.
One extra little thing though, is that on the same registery folder is a value [QKeyLedTimeout] which controls the timeout of the blue lights behind the slide out keyboard, in seconds. I've set this to 30 which seems to be better then the mear 10 seconds you are normally given.
Thanks for that Percz
I'm going to download a registry editor from somewhere and give it a shot.
Did you work all this out by playing around with the registry?
I found in the same folder
HKEY_CURRENT_USERS/ControlPanel/Backligh/
the two keys MaxACBrightness and MaxBrightness. I set those to 30 and now I've got 30 graduations in the slider but only the first 10 work.
I guess there must be another two keys somewhere that set the actual low brightness and high brightness values.
I'll keep digging around and see if I can find something.
Well I have a HP Jornada 720 Handheld PC and it is 6 years old and still has the original battery in it and I find it lasts about 7 hours easy and I use it every week or so now but before I would be using for a couple of hours a day and it just keeps going a reset every few months but other than that it is fine. With the BA reset it 3 times a day, carry a extra battery just so it makes it through the day and then you still have other problems.
how much diffrence between Auto backlight&manual in battery consuming
is there any experience ???
nobody knows?
One week ago, I changed the option for backlight to 5 min instead of normal 30sec. I even changed the backlight on while making calls (tweak cabfile). I don't notice any more batteryconsumption. This is a overall experience.
I think more brightness on the display will be more battery consuming than backlight settings.
neptunes50 said:
One week ago, I changed the option for backlight to 5 min instead of normal 30sec. I even changed the backlight on while making calls (tweak cabfile). I don't notice any more batteryconsumption. This is a overall experience.
I think more brightness on the display will be more battery consuming than backlight settings.
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Thanks! I think you are right
What ever option you choose that cuts Electricity flow saves Batts.
So yes turning the screen all the way down when only doing calls and at night helps a lot!
Note also that the auto-dim function doesn't ever dim the light right down (no matter how dark it gets) - the lowest it reaches is equivalent to the manual brightness level 3.
Mathew
Hello everyone i was just asking if the IPS screen uses more battery depending on the brightness level only or on the colours it emits also??
If so, does it consumes more battery with "black" colour (not really black... rather grey ) or white colour?? Please reply!
what I know is that IPS is a type of LCD which is a panel emitting light and 3 colours (Red,blue,Green) is that right? When it displays "black", it blocks some colours..
I know the OB screen consumes only depending on brightness, not the color.
White and black consume equal, and the white consumes less than superamoled white.
well our optimus black has been introduced saying that its ips display is powered by a lg technology called "nova" (nova display at the facts), and the most importat spec of this screen is the high brightness level (700 nit) and that the white color consume much less battery then competitors screen. This is the technical description provided by lg, but could be only pure marketing, who knows! Btw i think this screen is amazing, try to put an optimus black near a galaxy s2....well i think gs2 screen is a s**t !! just my 2 cent!
The white color consumes much less not of every competitor screen, but only less of traditional LCD screen ( - 30%) and super amoled (- 50%).
on the other hand the superamoled consumes nothing on black color
Guys, today i successfully got root and first of all slightly changed the values in sysmon.cfg. Changed maximum brightness level (255) from first value till next four values, so there`s first five values set on maximum brightness, 255. And then the brightness gradually goes lower and lower till minimum (100) value. I did the same thing on my previous phone, Xperia T, and had no issues with this. What do you think, everyting will be OK with Z ? I don`t play games so much , more often surfing, music, movies. But when the screen is changing brightnes this is so annoying, so i`ve changed this values, but a little bit worry, because the screen is bigger and quad-core processor, so what do you think ?
Well, i guess noone knows exactly answer on this question, and in the meantime i changed the values, and set first 10 values to maximum (255) brightness level, and have no issues with this. Instead i have maximum brightness level of the screen when surfing and listening the music, but in games the screen still makes darker, when the temperature of the phone becomes too high, and in this condition i think the screen is better to be a darker indeed, to not to let the phone become too hot and not to damage it. But in the normal state i think that the screen in maximum brightness won`t damage the device. I hope so
Does anyone use this phone on full brightness and if so what is the battery life like? just curious because i'm thinking about using it on 100%
Thanks
Dude I'm sure using it at 100% brightness will kill your retina before it kills your battery.
Seriously though, I think they made some changes to the brightness setting in one of the more recent firmwares, because it shines with the intensity of a thousand suns now at 100%, compared to what I remember it's like originally. I used to set it at 50% brightness, now it's at 25% or so but with the same perceived luminosity level (non-scientific of course).
Do you really need it at 100% constantly?