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Dear Developers,
I have been messing with my phone lately and got to know something.
1. Pull out the Battery and reinsert it.
2. Go to a Pitch black room and boot the phone.
3. At the Galaxy S Screen, you can notice that the Black portion of the screen is totally black, meaning that the pixels are totally OFF.
4. Once the Phone boots up, Power Off the phone, just before the phone turns off, you will be able to see a bare illumination as if there is some backlight, which means that the Black pixels are not totally off. You can even notice the same with a black image on your screen.
I am not a Technical Person, but I guess the screen driver is powering down the pixels instead of totally turning them off, like it happens during the boot. Maybe we can tweak the driver to totally power down pixels for black content. This would help the screen show deeper black levels and also will help save the battery, keeping in mind that the screen is the biggest battery hog.
Maybe any Developer can share a word on this.
Thanks!
they always give some light . But when there is something at the screen (like the logo), you can't see it because of the high contrast.
I have made several checks and I am pretty sure that the logo screen has totally black background, but after booting, the screen gives out some light.
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Human eye can't see deeper levels of black what it is now and samsung would have tweaked it if it wouldn't harm phone, or if it would be even possible.
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I am giving main emphasis on the battery life rather than colors. The boot screen shows perfect black so the screen can definitely support it..
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dhiru1602 said:
I am giving main emphasis on the battery life rather than colors. The boot screen shows perfect black so the screen can definitely support it..
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SAMOLED screens can display true black. If you want to get technical the contrast ratio of a SAMOLED screen is infinite. The battery life gains wouldn't be noticeable though.
My guess is that the 'almost-black' brightness is to maintain response time.
A non-linear device (like a diode or a transistor) that is completely off will have a transient to turn on because it's junction/channel capacitance(s) need to be charged up before it will start to conduct. In things like current DACs there will sometimes be a trickle current through 'off' devices whose purpose is to keep devices 'on' so that they will be faster to start conducting again when required.
Just guessing that this may be the reason for the non-zero minimum brightness (although it is pretty damn dark).
Op, i've just tried pulling pattery out - the screen still shines.
However, i would really like to see the completely off black pixels - for reading in dark, for example. We need to ask someone like Supercurio to sort everything out.
the NoLED app was made specially for this phone to conserve battery
when a OLED display is not on, it is not using power, it has no light
google OLED technology to learn more
AllGamer said:
the NoLED app was made specially for this phone to conserve battery
when a OLED display is not on, it is not using power, it has no light
google OLED technology to learn more
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You are wrong. This app was not made to conserve battery, and it does not turn off light completely. Read the op-post here http://forum.xda-developers.com/showthread.php?t=730692 Author had marked out statement about energy consumption, because black on Super Amoled doesn't behave as it should on OLED.
you mean this? http://www.devasque.com/noled/FAQ.php
Q: What about battery drainage ? How much battery percentage does this app consume per hour ?
A: To answer this question, I quote our friend evilhunter101 from xda-forums.com
"That's a question that simply can't be answered for you and everyone else who wonders. Why? Because all the available settings change the battery consumption, as well as what other apps you have installed and what kernel or OS you are using. Simply put, try the app. If you like it, keep it. If not, uninstall it. You have literally got nothing to lose.
P.s. I see no difference with or without NoLED, while others swear its a battery hog. I imagine we have it set up very differently."
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dhiru1602 said:
I have made several checks and I am pretty sure that the logo screen has totally black background, but after booting, the screen gives out some light.
Sent from my GT-I9000 using XDA App
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keep your finger over the logo and any other light sources and you will see the black still gives some light.
Sounds interesting
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I believe this is current leakage or deliberate to boost response time. I think its just how it works period kind of like wishing the backlight didn't bleed through blacks on lcd screens... can't be changed with a driver mod sorry
Stock XXJVK, Voodoo GB hack Kernel, JQ1 modem
It seems like my screen is is warmer than ideal. See attached screenshot with an LED backlit laptop screen at 100% brightness, a Nexus S at 50%, an iPhone 4 at 50%, and the N7 at 50%.
Anyone elses warm like this?
Does anyone think this can be correctable/adjustable via kernel tweaks?
denimjunkie82 said:
It seems like my screen is is warmer than ideal. See attached screenshot with an LED backlit laptop screen at 100% brightness, a Nexus S at 50%, an iPhone 4 at 50%, and the N7 at 50%.
Anyone elses warm like this?
Does anyone think this can be correctable/adjustable via kernel tweaks?
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I remember my nook color was able to create all kinds of funky screen colors/temps. So yeah
I noticed that the colors are a little off on the nexus 7. Supercurio released an app before for the Tab 10.1 to calibrate display and hopefully we will have one soon for the nexus 7
Sent from my Nexus 7 using xda premium
delete
I tried an app called "screen adjuster" and it helped a little bit but the problem is it uses quite a bit of CPU when it's turned on, animations become noticeably sluggish so it's only really good for testing. Anandtech did some tests on the display and found that greens are a bit undersaturated which kind of makes sense. This is why yellows in particular don't quite look right and makes the colors overall look washed out, the tint is a bit warm as well. With CM7 on my phone there are a few preset settings to choose from for display calibration that were made for particular phones like the Nexus One, it would be great if someone could fix this, either with an app or via root, or a custom rom.
Also, if you are going to try the app, I suggest you set the blue to about 6% and you'll see the tint is much less warm afterward, but it won't fix the saturation.
Actually, I think the other devices you have are particularly cool. The IPS screen like my Nook and Nexus have is much higher contrast, and doesn't exhibit the somewhat blue look I've noticed on many TFT LCD screens which use LED back lights. For example, my Droid 4 has a VERY cool shaded screen because it isn't just RGB, but rather RGBW and the cool-toned light of the LEDs shows very clearly.
I much prefer the warmer color temp of the Nexus 7 to the Galaxy Tab 2 7.0's coolness. The N7's whites are white at much lower screen brightnesses, rather than the frosty blues of the Tab 2.
i just wondered how the battery consumption is on white compared to amoled screens? since i had a gs2 before i've been hesitating to choose white backgrounds to not to drain my battery.
I don't think colours matter on LCD screens, so black won't save any battery either
Exactly. Black colors will conserve your battery on AMOLED screens, but not LCD screens.
Sent from my Nexus 4 using xda premium
so there won't be any difference?i believe in daylight time it's more reasonable to choose lighter colors than darker to see the screen.
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.
OLED looks OK but I never liked it on my S2 and the S3 looks the same TBH.
OLED looks green/bluish in tone. Whites are not as crisp as LED either.
Also OLED consumes MORE on White than LED on White at the same light output !
Everyone who's owned a SIII knows the screen is completly useless when it comes to the sun being shined at it. Cannot see anything. What about the S4? Same issue? Just curious about to buy one
Also how's the screen for you all? =)
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I haven't found it too bad, I have found the auto brightness to adjust really well. It hasn't been too sunny here though
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Shoulon said:
Everyone who's owned a SIII knows the screen is completly useless when it comes to the sun being shined at it. Cannot see anything. What about the S4? Same issue? Just curious about to buy one
Also how's the screen for you all? =)
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I don't have an S4 yet but a report by displaymate a couple of days ago showed that when you have auto brightness turned on the AMOLED screen is just as bright as the brightest LCDs out there (around 475 nits). Of course you can't set this amount of brightness manually since you would overheat your phone and cause screen burn in if you did. That is why Samsung only allows this for when you have on auto brightness. Since as soon as you go back indoors it will lower the brightness back down.
Long time S3 user (launch) and just picked up the S4 yesterday. The screen, in terms of quality, offers a noticeable improvement over the S3. I migrated everything over from one phone to the other and there's no mistaking which is which. The total difference, however, is less than the difference we saw going in the S2->S3 IMO.
In bright light, unfortunately, they're basically the same as far as I can tell. The auto-brightness setting seems more conservative on the S4 (possibly to help with thermal issues), but I haven't had a chance to crank it up all the way out in the sun.
If screen brightness matters a lot to you, I urge you to take a look at the EVO. The LCD screen on that is much improved, extremely bright as usually, and the blacks are getting considerably blacker (see anantech review). I myself played with it for a half hour but quickly jumped back on the S4 since it fits me better.
I've owned every galaxy phone since the galaxy epic. (Sprint qwerty phone) AMOLED screens are great despite no anti glare features.
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Screen is great until your moving grey on a black background and then you have weird purple smears going on. Not sure if it's a faulty display or just 'how it's meant to be'
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The screen is stunning! Extremely sharp with smooth text and eye popping colours, its basically like Apple's Retina display on iP5 but with AMOLED benefits on top.
In sunlight it fares well from my experience, better than S3, IMO, its a lot less reflective.
Stunning!
6 Stars.
Your told, lcd is brighter in sunlight which is the main reason your tokd Lcd is superior or at least thay say amoled is inferior. Wrong,its because if default settings by the makers. Once rooted with proper kernel(almost every device has em) you can do with amoled what you cant do with lcd. Double the color multipliers from android default of 200 to 400. I use in order of RGB, 320/320/400 to achieve perfect white and black. Also the battery myth,lcd drains less. Thats bullcrap. Amiled black pixel achives pure black because its actually OFF. that is main reason it uses less power than lcd. Instead if going on and on I will just show u proof. I will show you picture of my LGOG(sprint optimus g) and my even aging gnex side by side in sunlight with my shadow on half the screens to show its actual sunny lol. A pic says a lot more than my Bloveating. Im using my sgs4 to post this and used its awesome camera tontake the pic if pic does not show in op I will post in first post. Have a great day peeps. Your friendly neighborhood noobness fighter.Crwolv
1st
Crwolv said:
Your told, lcd is brighter in sunlight which is the main reason your tokd Lcd is superior or at least thay say amoled is inferior. Wrong,its because if default settings by the makers. Once rooted with proper kernel(almost every device has em) you can do with amoled what you cant do with lcd. Double the color multipliers from android default of 200 to 400. I use in order of RGB, 320/320/400 to achieve perfect white and black. Also the battery myth,lcd drains less. Thats bullcrap. Amiled black pixel achives pure black because its actually OFF. that is main reason it uses less power than lcd. Instead if going on and on I will just show u proof. I will show you picture of my LGOG(sprint optimus g) and my even aging gnex side by side in sunlight with my shadow on half the screens to show its actual sunny lol. A pic says a lot more than my Bloveating. Im using my sgs4 to post this and used its awesome camera tontake the pic if pic does not show in op I will post in first post. Have a great day peeps. Your friendly neighborhood noobness fighter.Crwolv
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Pics wouldn't attach.must be because of using phone
Pic
2 different pic styles,img and jpeg clearly shows that even with a shattered and pentile matrix amoled screen its brighter in the sunlight. Even did my shadow in it so no one would say....sun wasnt out lmao. Sorry naysayers proof is in the pudding and the gooey pudding is right in front of your face. Proper kernel with amoled is brighter and better battery saver than lcd. Lcd is backlit anyway and most high end phones will use it in the future because it can be bended and manipulated and LCD can't because it is backlit. Only low end phones will be lcd in the future.
I agree with what you've said (I use Samsung phones primarily), but it is true that when displaying white, it uses 3x as much power as an LCD. On mostly black, you're correct; very little power draw.
Tell me about AMOLED burn-in. Since you are increasing the luminosity, I would suspect that burn-in would be faster?
Keeping my eye out for this one...very interesting.
Do you guys mind if I ask what this "burn-in" is and how to fo about it?
Very interesting indeed.
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eggymustdie said:
Keeping my eye out for this one...very interesting.
Do you guys mind if I ask what this "burn-in" is and how to fo about it?
Very interesting indeed.
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Similar to plasma screen televisions, if you leave an image on the screen for a long time (much more than average), you'll see remnants of it permanently. However, if it's anything like televisions, you can fix it by displaying a white image on the screen (entirely white) for a few hours. I've never had this happen to me and ive owned almost all major Samsung phones. Nexus S, Galaxy Nexus, Galaxy S II, Galaxy S III, Note 2, and now S4.
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I see...so is it a bad thing?
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eggymustdie said:
I see...so is it a bad thing?
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Burn in? Well yes. You're going to see the ghost of whatever burned in, everywhere.
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Woah. Kinda like on my old phones...so that's what's called...wow.
Is there anyway to fix this?
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burn in
Yes burn in can occur on older like the gnex. Newer amoled is less likely but always set time out of 2 min when color multipliers are set to max. Best settings,for pure white is ,320,320,400 rgb color multipliers. Sorry should have talked about burn in,my apologies .
of course
Crwolv said:
Yes burn in can occur on older like the gnex. Newer amoled is less likely but always set timperiod., just remember out of 2 min when color miltipliers are set to max. Best settings,for pure white is ,320,320,400 rgb color multipliers. Sorry should have talked about burn in,my apologies .
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Just remember in all aspects except maybe battery power AMOLED is superior if your rooted and have a proper kernel (there there look for em) amoled is superior and infinitely more controable then LCD, period. Sorry naysayers look at proof in sunlight
tapiov said:
Tell me about AMOLED burn-in. Since you are increasing the luminosity, I would suspect that burn-in would be faster?
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Oh yes, burn in way faster. Keep at least older amoled/oled screens at 2 min or less
Product F(RED) said:
I agree with what you've said (I use Samsung phones primarily), but it is true that when displaying white, it uses 3x as much power as an LCD. On mostly black, you're correct; very little power draw.
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black pixel is actually zero power draw the pixel is off
So how do you get this better color might I ask? You say proper kernel...any way to get it on an S3? Specifically an SGHT999?
Crwolv said:
black pixel is actually zero power draw the pixel is off
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I said mostly black. On complete black, you're right. But you're not going to be using an app that's entirely, 100% black, are you?
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Product F(RED) said:
I said mostly black. On complete black, you're right. But you're not going to be using an app that's entirely, 100% black, are you?
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Actually I use an apk that uses complete black for the whole screen and I use it quite often!!! ou know what it is, my wallpaper. Lol
Crwolv said:
Actually I use an apk that uses complete black for the whole screen and I use it quite often!!! ou know what it is, my wallpaper. Lol
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So you have no icons at all on the screen and you hide your status bar?
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