Database Develop

How much energy should a totally black screen be consuming?

I've heard that a black screen will use very little energy, so I tested it myself. I put Aldiko in night mode on a blank page for an hour. My phone used 17% battery (97% from the display) in this hour. Was there some flaw in my testing? Did I misunderstand the claim? Is there some setting that I need to change? Or is this normal?

heliumhelicopter said:
I've heard that a black screen will use very little energy, so I tested it myself. I put Aldiko in night mode on a blank page for an hour. My phone used 17% battery (97% from the display) in this hour. Was there some flaw in my testing? Did I misunderstand the claim? Is there some setting that I need to change? Or is this normal?
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just run your charge to 100%, unplug your phone and put it to sleep immediately, and check after an hour.
theres a true reading.

I think he's trying to get a reading of the battery usage with the screen "running" the color black. By putting it to sleep the screen isnt really running. Try the experiment again see if you get the same results. then try it with a white and lets see the difference.

heliumhelicopter said:
I've heard that a black screen will use very little energy, so I tested it myself. I put Aldiko in night mode on a blank page for an hour. My phone used 17% battery (97% from the display) in this hour. Was there some flaw in my testing? Did I misunderstand the claim? Is there some setting that I need to change? Or is this normal?
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Click to collapse
While black uses almost no power, there is a small flaw to your logic. Even though you were displaying an all black screen, anything using CPU cycles in the background is still running (as opposed to if the screen was in sleep mode--which is where the recent bug in facebook came from). The app could also be draining battery waiting for things like touch-sensitive controls.
The claim isn't that black pixels use no power, it's that they use drastically less as opposed to a colored pixel. An AMOLED screen uses a lot of power, and an SAMOLED will at use close to (or more) than that. The idea is that you'll lose far less battery life with a black screen than you will with a screen that's all lit up, which isn't true of a standard LCD.

Kaik541 said:
[...]
An AMOLED screen uses a lot of power, and an SAMOLED will at use close to (or more) than that. The idea is that you'll lose far less battery life with a black screen than you will with a screen that's all lit up, which isn't true of a standard LCD.
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not quite. it depends on what is being displayed.
quoting wikipedia: en.wikipedia.org/wiki/Organic_LED#Disadvantages
Power consumption: While an OLED will consume around 40% of the power of an LCD displaying an image which is primarily black, for the majority of images it will consume 60–80% of the power of an LCD - however it can use over three times as much power to display an image with a white background such as a document or website. This can lead to disappointing real-world battery life in mobile devices.
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as far as super amoled: en.wikipedia.org/wiki/Super_AMOLED
Compared with the first-generation AMOLED, the Super AMOLED advantages are:
* 20% brighter screen
* 80% less sunlight reflection
* 20% reduced power consumption
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vizir said:
not quite. it depends on what is being displayed.
quoting wikipedia: en.wikipedia.org/wiki/Organic_LED#Disadvantages
as far as super amoled: en.wikipedia.org/wiki/Super_AMOLED
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I assume you're more or less commenting on general power consumption, because both of those things backed my side about how it uses even less power when displaying blacks versus whites. The only thing different than what I said is that wikipedia claims it uses less power some of the time, but more power other times, so I'm not sure which part you're disagreeing with by saying "not quite."

Screen burn :(

I just noticed shadows on my screen a few days ago, it's definitely screen burn as I can see the clock and other icons. Anyone else getting this and would this be a warranty issue?
I never leave the screen on overnight or anything, I usually have the desk clock running overnight but that has it's own built in screen saver so that's not the issue. And the burnt in images are of the desktop icons.
I would have expected far better quality and life expectancy from such an expensive device. My Alienware laptop is now over 2 years old and the screen is perfect even though it stays on longer than the Note.

go-away said:
I just noticed shadows on my screen a few days ago, it's definitely screen burn as I can see the clock and other icons. Anyone else getting this and would this be a warranty issue?
I never leave the screen on overnight or anything, I usually have the desk clock running overnight but that has it's own built in screen saver so that's not the issue. And the burnt in images are of the desktop icons.
I would have expected far better quality and life expectancy from such an expensive device. My Alienware laptop is now over 2 years old and the screen is perfect even though it stays on longer than the Note.
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Screen burn happen on amoled screens not on other type of screens and your alien ware doesn't have an amoled screen...
There's a thread about screen burn go there..

I also have screen burn on the bottom half of my device.
It looks like an eye doctor's test chart. Literally.
How does this happen?

Got it fixed under warranty. I'll never ever be using that "DIMLock" app again as it was the cause of the burnt screen! Well actually now I think about it the biggest culprit was that bloody annoying "Battery fully charged - unplug charger" message which bugs the snot out of me by ALWAYS popping up 5 minutes after I've pressed the power button to put the screen into sleep mode. That dumb message turns the screen on, and because DIMLock was running, the screen would stay on after that, and if I fell asleep in the meantime then it would stay on all night!!
I really wish I could disable that stupid message.

Use a launcher that hides status bar. Use full screen for web browser...etc etc...
Sent from my GT-N7000 using Tapatalk 2

[Q] Help!!!

Hello Friends I Bought ZR (White) One Month Ago.And I Am Loving it.Bt I Have Some Questions About It:-
1.Is The Back Panel Dust-proof I Mean Will It Catch Dirt And Will It Be Dirty If I Use It Without Back Cover Currently I Am Using A White Back Cover.Bt The Cover Is Too Bad It Catches Dirt And Other Things Easily.
2.Does The Phone Comes With Preinstalled Scratch Guard Coz It's Written On The Box That This Unit Contains Scratch Guard Bt I Didnt Got Any guard In box And The Phone Also Have Something In Top Of Screen Is It Scratch Guard Or It's Anti Shatter Film?
3.Battery Reduces To Apprx 10-15% Over The Night With Stamina Mode And Low Battery Mode On.And All Apps Closed With No Wifi And No Data Connection Active Bt In Running App Shows Google Service Running And It Doesnt Close It Restarts Itself No Matter How many Times I Close It.
And Sorry For My Bad English..

yaduvanshi said:
Hello Friends I Bought ZR (White) One Month Ago.And I Am Loving it.Bt I Have Some Questions About It:-
1.Is The Back Panel Dust-proof I Mean Will It Catch Dirt And Will It Be Dirty If I Use It Without Back Cover Currently I Am Using A White Back Cover.Bt The Cover Is Too Bad It Catches Dirt And Other Things Easily.
2.Does The Phone Comes With Preinstalled Scratch Guard Coz It's Written On The Box That This Unit Contains Scratch Guard Bt I Didnt Got Any guard In box And The Phone Also Have Something In Top Of Screen Is It Scratch Guard Or It's Anti Shatter Film?
3.Battery Reduces To Apprx 10-15% Over The Night With Stamina Mode And Low Battery Mode On.And All Apps Closed With No Wifi And No Data Connection Active Bt In Running App Shows Google Service Running And It Doesnt Close It Restarts Itself No Matter How many Times I Close It.
And Sorry For My Bad English..
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1) Better to use a back cover. Head over to accessories section and find one.
2) It comes along in the BOX. You do not have it on the screen already. Its like a free screen-guard placed in the box to get it on and use.
3) Post your battery stats here and lets see if you have any abnormal issues. On general, if you full charge the ZR, it must get you through the day without any problems. Infact i used the phone for 2 days without charging with 6 hours of music and 1 hour of talktime, use of camera and after some games, it was still having some 10% left in it. So post your screen shot of battery stats..

TK8 said:
1) Better to use a back cover. Head over to accessories section and find one.
2) It comes along in the BOX. You do not have it on the screen already. Its like a free screen-guard placed in the box to get it on and use.
3) Post your battery stats here and lets see if you have any abnormal issues. On general, if you full charge the ZR, it must get you through the day without any problems. Infact i used the phone for 2 days without charging with 6 hours of music and 1 hour of talktime, use of camera and after some games, it was still having some 10% left in it. So post your screen shot of battery stats..
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1. Currently I Am Using White Cover It Catches Dust And Get Dirty Easily
2. There's Nothing In My Box Bt Its Mentioned In Box That It Contains A Scratch Guard.
3. I Will Post It Later.

1- i dont think that "Dust proof" means that the phone will not catch dust on its exterior parts , but it is dust proof when it comes to dust insertion such as under the screen or something like that ..
it is true, the back panel catches dirt and fingerprints easily , but i think cleaning it with water from time to time will help , or you can buy a cover that will help keeping it protected form dirt
2- why do you want a scratch guard , the screen is already shatter and scratch proof
3- i saw in a review about the ZR ( it think on GSMArena) that is has strange battery performance at night , although mine is really normal (c5502), but still, the ZR battery is very good one.

1. ya dats why using a back cover
2. i am asking because the shatterproof screen also catches scratch i also have z which i am using without scratch guard it have many scratch now on screen
3. dont it goes down at night

yaduvanshi said:
...
3.Battery Reduces To Apprx 10-15% Over The Night With Stamina Mode And Low Battery Mode On.And All Apps Closed With No Wifi And No Data Connection Active Bt In Running App Shows Google Service Running And It Doesnt Close It Restarts Itself No Matter How many Times I Close It.
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Turn off Location Based Wifi in Power Management, this is what causes the battery drain.

Willber G said:
Turn off Location Based Wifi in Power Management, this is what causes the battery drain.
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Its Off

Is there a way to keep the display always on?

I couldn't find anything on this and was wondering if its possible. I know it will shorten battery life a lot but I would still like it if the display could always be on.

I think the screen will burn in, same as on the note 3
Sent from my SM-N900P using xda premium

microdot said:
I couldn't find anything on this and was wondering if its possible. I know it will shorten battery life a lot but I would still like it if the display could always be on.
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use this
https://play.google.com/store/apps/details?id=com.nbondarchuk.android.keepscn

Sideloading the app above might work but I would not expected to say on more than a few hours due to battery life. It is not designed to stay on all the time. Change the screen time out to five minutes and set the wake up Motion and that will help.

highlordkram said:
Sideloading the app above might work but I would not expected to say on more than a few hours due to battery life. It is not designed to stay on all the time. Change the screen time out to five minutes and set the wake up Motion and that will help.
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It's a amoled screen, so black pixels are actually off, right ?
If i use a custom and ultra minimalist clock (2 pixels white on black font, one for hour, one for min) it will use a significant amount of battery if i keep it on ?

I know most of the drain comes from the screen but I wonder if the intensity is at 1 and you have a black background white text how long the gear would last.
At 4 my gear I charge every two days and even then there is a lot of life in the battery.

Baltyre said:
It's a amoled screen, so black pixels are actually off, right ?
If i use a custom and ultra minimalist clock (2 pixels white on black font, one for hour, one for min) it will use a significant amount of battery if i keep it on ?
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Click to collapse
while black pixels are indeed off, i believe just waking up the gear itself will consume more battery, just because it stays 'ready' the whole time.

I thought it would be nice if the watch face was visible all the time but didn't think about burn in. It's probably for the best to leave it as is. Thanks for all the replies.

Does broken screen make battery life decrease?

I have the S10 Exynos version unlocked, since new I noticed a dead pixel, whatever not big deal, never took it to warranty, but a few months ago I dropped my phone with case and everything so the frame wasn´t affected but the screen... the glass didn´t broke but the screen did... Appeared some white lines near the edges, some horizontal and one vertical, and the phone now sometimes the screen turns on, sometimes I have to lock and unlock it several times with the button to get the screen to turn on, green tint or flickering on high brightness, etc... Expected problems on a phone with broken oled screen.
My question here is: Does a broken OLED screen waste more energy?
Since the broken screen incident, my phone heats up more quickly when in use, I run out off battery juice in like 4 hours of normal use, and I know the white lines may consume more energy as they are also on max brightness even when I have my brightness set to 1/4, but that much energy? The lines arent even that big, just in the lower and left edges of the screen.
No settings where changed asside from using the windows phone app sometimes, no new apps, adaptive brightness off and almost always on 1/4 intensity, dark mode enabled, screen resolution set to HD+, battery mode on optimized and adaptive energy saving on, no virus according to mcafee built in, and really no changes aside for the broken screen.
Also any ideas for making my battery last at least half day? Appart from changing the screen and doing a hard reset (I can´t afford the screen repair right now as it is 200 dollars in my country) and the hard reset has already been done a month ago with same results