Will using inverted apps save battery on the nexus 10? Or does it only work for amoled screens?
That trick only works on AMOLED devices. Sorry.
Yeah that would be nice
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The LCD back light is always on using battery, no matter what color your displaying. With AMOLED, only the sections of the screen displaying color are on, and the black sections are portions of the screen that you could say are "turned off". AMOLED works by exciting a membrane with electrons, without using a back light.
To quote myself from the Nexus 4 forum:
"Simple answer: There is no affect on battery life. It will drain just as fast on white as it will on black.
Basic screen technology lesson incoming...
The image displayed on a regular LCD screen (aka most phones) will not affect your battery life. Only AMOLED screens (aka most Samsung phones) are affected by this phenomenon because the image is also the lightsource.
Battery life with LCD screens is affected by the backlight brightness. The backlight covers the whole back, is always white, and only shines through the LCD to allow you to see the image. Turn up the brightness, consume more power. Turn down the brightness, consume less power. Has nothing to do with the image on the screen.
Amoled screens do not shine through anything, the image they produce is also producing the light. That's why blacks use no power (off), and whites use max power (all on).
The end."
Sent from my Nexus 10 using xda app-developers app
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with super amoled, if you use a black bg those pixels are just shut off and can save you some battery life. But the SLCD isn't as easy to see in the sunlight and i was curious if there is a difference in battery juice consumption with a white bg. Even black has to be luminated by the screen, not shut off pixels like S-AMOLED. Is there a difference between black n white on SLCD's battery drain?
I'm looking for a more technical answer with reasoning rather than "just try em both and find out".
White would be easier to see in sunlight without having to turn up the brightness past 25%.
Please don't quote me on this but I believe the difference in battery usage would be very negligible. It does take less power to display a black LCD screen than a white one but not enough to provide any noticeable difference in battery life like it does on AMOLED devices.
connerrs said:
Please don't quote me on this but I believe the difference in battery usage would be very negligible. It does take less power to display a black LCD screen than a white one but not enough to provide any noticeable difference in battery life like it does on AMOLED devices.
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Thanks. I did just remember about a cyanogenmod setting to filter the color of the screen and it quote "potential battery saver". Im not sayin battery life is an issue, just curious on knowing the differences in power consumption by color. But like u said, its probably very minimal tho. My 2 past devices were S-AMOLED and I didn't bother with predominantly white backgrounds because it actually made a difference. Time to be able to enjoy the entire spectrum on SLCD without worry! Haha one of the few benefits of LCD
Sent from my PG86100 using XDA Premium App
I think it might use more power on LCD screens. Or, at least, I remember reading that. However, back on my Hero, I tried the effect and it seemed to use the CPU more to render the effect. The phone got slower while in red, blue, etc. I think it is really only for AMOLED screens. Phones using that type of screen benefit a lot more. But I am most likely wrong. It has been a long time since I read up on this tweak.
Sent from my iPhone with the bigger GeeBees.
notasimpleway said:
I think it might use more power on LCD screens. Or, at least, I remember reading that. However, back on my Hero, I tried the effect and it seemed to use the CPU more to render the effect. The phone got slower while in red, blue, etc. I think it is really only for AMOLED screens. Phones using that type of screen benefit a lot more. But I am most likely wrong. It has been a long time since I read up on this tweak.
Sent from my iPhone with the bigger GeeBees.
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that sucks that the phone becomes sluggish, but then again it was the hero which is 1/4 the phone the 3D is...
also, i'm trying to make sense of it being for AMOLED screens, cuz the pixels are individual LEDs (or so i think) which are on/off individually. but LCD is Liquid.Crystal.Display, which to me makes more sense to render the entire display a certain color... i dunno, probably talking outta my a$$ but hopefully someone with a definite answer can chime in..
thanks for all the info & opinions from you guys, i feel we're getting closer
Hello,
Im Using Amoled Smartphones since the Galaxy (i7500). They all were always showing at 100% Brightness for Black parts of a picture a true Black like the Display is OFF.
If you put the Brightness to 100% and go to an complete Dark Room and open an Black Picture you see some Gray/Yellow Tint on the Screen. You can compare this good by locking the phone to see the Screen OFF and than unlock it to view the Black Picture again. You should see a huge difference. Hope to hear from your experiences.
I've seen that already on the S1 when abusing it a a nightstand clock.
Best guess I've heard is that the (AMO)LED screen leaks some luminosity to other pixels in the background which is then visible as a very faint glow.
However I rather believe that the AMOLED are not truely off but rather get some leak voltage and thus have a very-very-very faint glow (like one photon per second xD )
That would explain the black spots most people seem to mind on AMOLED when on minimum brightness with a black screen; they are truely off or without insufficient leak voltagage (LED's requie a minimum voltage to work).
AMOLED production is somewhat complicated (very thin layer of silver as a power source and a control-layer) so I wouldn't be surprised if the above is true.
Nothing is perfect, especially not a rather new technology.
What else did you expect from a backlit display.
jbadboy2007 said:
What else did you expect from a backlit display.
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It's not backlit is the point.
Correct me if im wrong here but amoled is, by design, not backlit.
Sent from my LG-P920 using xda premium
Yeah so I was wondering why it does this little/ hard noticeable yellow/gray tint on a dark room...
There is no Backlight... Unfortunely i Sold my Galaxy S2 so I cant compare it.. But im Sure it wasnt like this
I have this on my gsiii and also on the Gnote... I think is due to the pentile screen
I had this on my Fascinate but realized it wasn't a big issue. Definitely more noticeable on my Gnex but it also has more pixels so that could be why you see more light. I wouldn't call it a problem because the majority of the time it's absolutely unnoticeable. Each pixel has so have some sort of voltage to be ready to react to changes. Turning off/on completely each time light is needed might waste battery.
P.S. I'm noob at displays but that's my theory.
Zacisblack said:
I had this on my Fascinate but realized it wasn't a big issue. Definitely more noticeable on my Gnex but it also has more pixels so that could be why you see more light. I wouldn't call it a problem because the majority of the time it's absolutely unnoticeable. Each pixel has so have some sort of voltage to be ready to react to changes. Turning off/on completely each time light is needed might waste battery.
P.S. I'm noob at displays but that's my theory.
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I was curious about this issue as well. It's my understanding that OLEDs do not produce any light in their inactive state.
Regarding your theory, I wonder if it's similar to plasma displays. Even though plasmas are capable of true black (they do not use a backlight) The individual plasma cells have better response times if they aren't fully discharged on blacks. So they have a faint glow that comes from the low power they are using to keep the pixel charged up and ready to go when a color change is needed.
This actually costs a little power though, rather than saving it. So if thats what they are doing, it is for screen quality reasons so that movies and other things look better.
Did some Googling and I couldn't find much information, but there is talk of delivering pre-charge voltage to the OLED pixels to improve response times. So it could be that they are indeed similar to plasma displays in that respect: Capable of true black, but the benefits of not using true black are too good to pass up.
Are you SURE the picture is actually true black? By that i mean pure 100% black in an uncompressed image? If not then you cant expect the phone to display true black. A JPEG of black may not be enough.
My screen it totally off when displaying true black.
I can confirm the screen showing a faint glow on S3 with a true black screen.
Use Firefox with Fullscreen extension (Chrome and the default browser don't seem to have fullscreen mode yet) and go to http://d4f.pf-control.de/black.html
That's rendered on the phone so we can expect it to be the blackest black an app can produce, however in a (very) dark room you'll see a very faint glow coming from the screen and you'll be able to see the black spots (truely black) that people keep complaining about.
The theory about it being a precharge voltage does indeed sound plausible since LED's have a certain reaction time which unfortunately cannot be compensated by e.g. Overdrive as is used in LCD screens.
Note that the S3's "black" is still far better than any LCD.
No mine is still jet black, no light at all.
Go to a COMPLETELY dark room and make sure the screen is actually turned on when on the website (not timed out).
Then take a long-exposure photograph of your phone (still make sure the screen is turned ON!).
I don't have a long exposure camera, but the room is completely dark and my eyes have adjusted, there is no light.
All sgs3 ( as sgs2) screens emit a very week glow on a black pictures ( with the screen on )
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It would seem to me that the 'ink spots' many have are not overly dark spots at all, they are what the screen should be. My screen emits no visible light when displaying a true black image, at least nothing my eyes can see, even at the edge of my vision field where light cell are most sensitive. My screen is on maximum brightness.
My screen has no patches, no streaks, no spots, no pink or excessively blue tint. I guess i have a screen thats as near to perfect as they get.
yes there is very faint glow indeed making the screen a bit greyish instead of pitch black
Excuse me if I am being naive but where is real life use would this ever be a negative impact?
jfenton57 said:
Excuse me if I am being naive but where is real life use would this ever be a negative impact?
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no negative impact, but still raises a question "why so?"
jfenton57 said:
Excuse me if I am being naive but where is real life use would this ever be a negative impact?
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I don't think anyone is trying to paint it as an issue that needs to be resolved. It's more of an odd technical mystery rather than a real problem. The blacks are still extremely deep on an AMOLED, just like with Plasma it puts LCD to shame in that department.
Coming from the gnex with an amoled screen, blues and black colors saved more battery. What colors, if any, make the LCD3 work less thus saving battery?
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On an LCD screen, all the light is supplied by the backlight, and the color is affected by what the actual LCD panel allows to pass through it. This means that the backlight (which by far consumes the most energy of the screen) will use the same amount of power regardless of what is displayed on the screen. The color may slightly affect the amount of energy used, but not significantly like with an AMOLED screen.
This will give you an idea of the amount of how much the power consumption varies based on color.
CastleBravo said:
On an LCD screen, all the light is supplied by the backlight, and the color is affected by what the actual LCD panel allows to pass through it. This means that the backlight (which by far consumes the most energy of the screen) will use the same amount of power regardless of what is displayed on the screen. The color may slightly affect the amount of energy used, but not significantly like with an AMOLED screen.
This will give you an idea of the amount of how much the power consumption varies based on color.
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I was thinking that but I wasn't for sure. Thank you for the link and the informative answer. Over 100 views and I didn't think I was going to get a reply hahah.
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Hey all. I was thinking, it is said that auto-brightness saves battery life oj your phone but surely ot uses more to chamge the brightness all the time. I travel a lot in work and am in and out of light which changes the brightness.
Is it really a battery saver? Want to save as much battery when in work.
Thanks.
Sent from my GT-I9300 using Tapatalk 2
Unless you manually set a very low brightness, yes it is. Note that most apps that do this from Play will use battery; the integrated AB feature does not.
In a similar vein, due to the nature of OLED panels, having dark backgrounds/themes/wallpapers will conserve battery over lighter backgrounds. Unlike LCDs with their LED backlights, OLED panels draw no power when the pixels are off (black).
Sweet. Thanks for the answer and extra ill take that as a christmas gift hehe
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Anyone know if the true HD IPS+ screen is similar to the AMOLED in that black pixels dont use as much power? For example, would we have the same power saving benefits of black wallpaper and inverted apps as a phone with an AMOLED screen?
Nope because the LCD tries and replicate black's SDI the screen is still on and using power
Sent From My AT&T LG Optimus G
REDFOCZ said:
Nope because the LCD tries and replicate black's SDI the screen is still on and using power
Sent From My AT&T LG Optimus G
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I don't know, are you sure? I would be willing to bet that even though power is used to emit something, it's only a fraction of the power used for bright colors.
Sent from my LG-E970 using xda app-developers app
As far as I'm aware, LCD is still continually and constantly backlit, unless you have one of those dynamic backlighting schemes like on some TVs where there are zones that dime to provide blacker blacks. The backlight is a separate source as LCD cannot emit its own light.
OLED provide the source of the light as well as colour, so when the pixel is black, it is actually off.
So, REDFOCZ's response is correct.
AMOLED screens don’t require a backlight. The benefit of losing a backlight is apparent: these screens are able to produce blacks so deep that the screen pixels can shut right off. This can save battery life if you use a background that is dark in color or black. LCD screens still require the back light on those using power.
Sent From My AT&T LG Optimus G
http://www.slashgear.com/lg-optimus...y-s4-pro-and-super-strength-battery-26243930/
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Either way I have to say I get awesome battery life on this phone
Sent From My AT&T LG Optimus G
Thanks for all of the thoughtful responses everyone! I don't even know why i'm trying to milk more battery life out of this phone (old habits from the captivate days i guess)! My experience with the battery life is great!
Can't find the article I thought I bookmarked because the question came up on the Infuse forums months ago but-- REDFOCZ- +1
http://forum.xda-developers.com/showpost.php?p=25144455&postcount=63