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I've found out, that the Amoled can't display perfect black. I tried the desktop clock thing, the blackle Google page (scrolled to black only area), and I made a photo in PhotoShop completely black and open it up in gallery.
What I noticed is, that the screen still is displaying something when it should be black. This is very easy to see if you put the phone to sleep when displaying such black.
What am I missing? Doesn't the Amoled completely turn of a pixel that is black? Can someone try to replicate this?
Do you think it's possible that I have an lcd desire and just don't know it?
Sent from my HTC Desire
I have also a Hero (with lcd display) and black on my Desire is "more black" than Hero's
For me it's ok
If you look at LCD screens through a circular polarisation filter you'll sometimes see coloured patterns on it, or it will get completely filtered out at a certain angle. To the best of my knowledge, OLEDs don't emit polarised light, so if you've been to see Avatar or another movie in Real3D and walked away with the glasses then you can use them as an LCD detector...
(The blacking out effect works as a cool CSI-esque monitor dust detector)
No disrespect, but... who cares???
So the blacks are not as deep as say, a Kuro plasma. This is a smartphone, not a home theater tv.
Jaa-Yoo said:
No disrespect, but... who cares???
So the blacks are not as deep as say, a Kuro plasma. This is a smartphone, not a home theater tv.
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no disrespect but,...
well real black "off pixel" don't use power so all the people who care about batterylife might care...
s.
I don't think they do emit light on blacks. I have noticed that in a completely dark room I can't see blacks on my Desire at all, it emits no visual light. Maybe the black you were testing isn't pure black.
Sent from my HTC Desire
"It's like, how much more black could this be? And the answer is none. None more black."
Couldn't help myself
Sent from my HTC Desire using XDA App
I do agree that it is much better than any lcd. BUT black should be no light at all. When you turn off the screen when all the pixels are supposed to be off, you see a change. You can also see the outline of the screen when it is in any of the previously mentioned methods of darkness.
Sent from my HTC Desire
I did the following test :
- found a room where I could be in complete darkness
- used the following enclosed file (a pure RGB=(0,0,0) 800x480 png file) and displayed it fullscreen on my phone.
- use the palm of a hand to cover the 4 lit buttons
- the screen is pretty damn BLACK ! (an LCD screen, next to it, also displaying black pixels, would look like a torchlight)
- After a minute or so, the eyes getting used to the darkness, I could very slightly see the screen. I don't know how the phone is built, but I'm guessing it's a light "leak" coming from the LED(s) of the 4 buttons.
I tried this procedure at various brightness settings (from min to max) : the remaining light coming from the screen did not change.
Is there a mod to kill the buttons backlight ?
It is possible to kill the backlights, but have not tried it myself.
http://forum.xda-developers.com/showthread.php?t=704977&highlight=buttons+backlight
Ok, switched off the buttons backlight thx to Flaggie. The screen indeed still emits some light when displaying a full screen black picture. Strange.
It would be interesting to get an explanation from HTC about this, but i'm pretty sure it pointless hoping they would reply to such a question. I'll give it a try...
Perhaps you hae one of those new Desire models with a LCD screen?
No, I bought it the day it came out. Try out on your own. The test I detailed is pretty straight forward...
kekkle said:
Perhaps you hae one of those new Desire models with a LCD screen?
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That is what I thought at first, but than the amount of light on dark would change when you change the brightness.
I want to know what HTC has to say about this.
PS: I bought my phone in June.
Sent from my HTC Desire
OMG does any of you know how a led screen works? lol Active Matrix Organic Light Emitting Diode its name clearly states that the pixels are self-illuminating so clearly unless the screen is of the display is always going to give some light off
It is actually the other way around. They are self emitting, they can turn off. LCDs, however have a backlight, which doesn't turn off, so some light still passes through.
Sent from my HTC Desire
OLED can havae infinate contrast ratios. I have a cowon s9, it has an OLED screen and in a pitch black room you cannot tell it's on. The desire does emit some light even on true black :-/
AndroHero said:
OMG does any of you know how a led screen works? lol Active Matrix Organic Light Emitting Diode its name clearly states that the pixels are self-illuminating so clearly unless the screen is of the display is always going to give some light off
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OMG please read the Wikipedia article...
Unlike over saturated colors and Pentile jagginess which are clearly visible and to some point distracting (at least to me) this seem like pure academic issue, since it can be visible only in total darkness and even then it is not visible unless screen is completely black.
What would be practical purpose in looking at black screen in darkness?
vlasac said:
Unlike over saturated colors and Pentile jagginess which are clearly visible and to some point distracting (at least to me) this seem like pure academic issue, since it can be visible only in total darkness and even then it is not visible unless screen is completely black.
What would be practical purpose in looking at black screen in darkness?
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I agree. This is an academic issue, but aren't you a bit disturbed by the fact that there has been soo much talk about this oled screen and its pure black, and it was all a lie?
I think the problem might be in the image to screen processing where it gets converted to the pentile matrix(and over saturated).
Sent from my HTC Desire
It is my understanding that super amoled uses very low power with blacks because of the absence of light while using up to three times the amount on whites.
I was wondering how tft lcd differs, is it better to show blacks or whites for saving power?
Smoke the Herb, Free your Mind
An LCD screen is backlit. There is a constant light source at the back of the screen, behind the liquid crystals (the 'LC' in 'LCD') that form the individual pixels of the display (the 'D' in 'LCD'). When a pixel changes color all it is doing is blocking some parts of the light behind it and letting other parts through. So whether the screen is black or white, or any color or shade in between, the same amount of light is trying to get out, and the individual pixels are merely stopping some of the light from passing through. That means the LCD power consumption is not affected by the color setting of the background (which would be the color setting of the majority of the pixels, in most cases).
[Taken from here: http://www.green-energy-efficient-homes.com/lcd-power-consumption.html ]
spiicytuna said:
An LCD screen is backlit. There is a constant light source at the back of the screen, behind the liquid crystals (the 'LC' in 'LCD') that form the individual pixels of the display (the 'D' in 'LCD'). When a pixel changes color all it is doing is blocking some parts of the light behind it and letting other parts through. So whether the screen is black or white, or any color or shade in between, the same amount of light is trying to get out, and the individual pixels are merely stopping some of the light from passing through. That means the LCD power consumption is not affected by the color setting of the background (which would be the color setting of the majority of the pixels, in most cases).
[Taken from here: http://www.green-energy-efficient-homes.com/lcd-power-consumption.html ]
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Thanks you that was exactly what i was looking for, appreciate the help spiicy, .
Smoke the Herb, Free your Mind
there are several threads for HD2 and desire they are using super amoled screens ... they have mentioned that for super amoled usng black background saves battery ...... cause the pixels are turned off ...
while in case of LCD the pixels are by default turned on .... so if we put black background it actually sucks more juice in case of LCD using Black background . it is advisable to keep white background in case of LCD
Motorola defy neither has LCD and definitely not super amoled screen ......so should we keep black background or white background to save battery ??? i mean ours is Capacitative TFT .... so which on of the case above i mentioned is applicable for motorola defy?
black is prefered, the white one is so dazzle...
joydeep1985 said:
i mean ours is Capacitative TFT .... so which on of the case above i mentioned is applicable for motorola defy?
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LOL, the Defy has a capacitive LCD Touchscreen.
So in theorie it is better to have a white background but
the most saving can be achieved when turning down the backlight.
So it is more important to have good contrasts.
greetings
LCD are on all the time when showing black areas or even a full black screen (not the same as being off), unlike OLED choosing a dark background will not save any battery life.
But I have noticed when using dark themes my display consumers less battery.
Sent from my MB525 using Tapatalk
Makes no difference, lcd backlight is always on regardless of colour.
Just decrease your phone's brightness, it will consume less battery regardless of White/Black background [which may matters but I never experienced such things]
sg3707 said:
But I have noticed when using dark themes my display consumers less battery.
Sent from my MB525 using Tapatalk
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Defy uses a LCD screen, therefore turning all pixels on all the time something is displayed. Even pure black pic
OLED screens however benefit from black backgrounds since a pixel is not turned on until it is commanded to display a color other than black. This results in deeper blacks/higher contrast.
therefore, using a black bg on a lcd screen will not save you power. If you experience otherwise, it's placebo effect
Previous to my GN, I've had a Nexus One, Nexus S, and Galaxy S II (international version) and on all of the phones black levels were pitch black and no different to the screen being completely off. Despite still being an AMOLED display, it seems the GN's screen can't do pitch black.
As a test, go in a dark room and open the clock app. Long press anywhere on the screen and the clock will go into night mode where it will be a completely black screen with just the time showing. You'll notice that there is a still a bit of light emitting from the dark spots.
A little disappointing... I wonder if this could be fixed in software.
PrawnPoBoy said:
Previous to my GN, I've had a Nexus One, Nexus S, and Galaxy S II (international version) and on all of the phones black levels were pitch black and no different to the screen being completely off. Despite still being an AMOLED display, it seems the GN's screen can't do pitch black.
As a test, go in a dark room and open the clock app. Long press anywhere on the screen and the clock will go into night mode where it will be a completely black screen with just the time showing. You'll notice that there is a still a bit of light emitting from the dark spots.
A little disappointing... I wonder if this could be fixed in software.
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It can do pure black but not everything is pure black. I just rebooted and say the Google boot image. Its solid black. I'm in a dark room now and can't tell a difference where the soft keys end and the case begins.
LTE Google Galaxy Nexus! - Stock
Asus Transformer - OC/UV
PrawnPoBoy said:
Previous to my GN, I've had a Nexus One, Nexus S, and Galaxy S II (international version) and on all of the phones black levels were pitch black and no different to the screen being completely off. Despite still being an AMOLED display, it seems the GN's screen can't do pitch black.
As a test, go in a dark room and open the clock app. Long press anywhere on the screen and the clock will go into night mode where it will be a completely black screen with just the time showing. You'll notice that there is a still a bit of light emitting from the dark spots.
A little disappointing... I wonder if this could be fixed in software.
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Actually that's just the clock app, you can easily see that it's an extremely dimmed version of your wallpaper. My wallpaper is this http://cooldesktopbackgroundsx.com/wp-content/uploads/2011/02/34327523.png
and I can easily see the eye in the dark mode.
I don't see how your background could make a difference. Night mode is completely black. Just look at the screen shot.
I can also notice this when first booting up and see the Google logo. It was the same this on two other units that I looked at, so I don't think it's unique to my phone. To truly notice it you have to be in a pitch black room. I only noticed it because I was using my phone as a bed side clock.
No screen will give you true black that close... Maybe you need a plasma tv screen
Sent from my Galaxy Nexus
tryceo said:
No screen will give you true black that close... Maybe you need a plasma tv screen
Sent from my Galaxy Nexus
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The whole point of AMOLED is that each pixel is it's own light source which can be completely turned off. True black was possible on every AMOLED phone I've ever used prior to this one.
PrawnPoBoy said:
The whole point of AMOLED is that each pixel is it's own light source which can be completely turned off. True black was possible on every AMOLED phone I've ever used prior to this one.
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That is exactly correct. Fortunately, at very low brightness, my GN does indeed display true black. I have an all black background and if I cover the time, I can't tell a difference between the phone off and on. Keep in mind that true black only occurs under extremely low brightness. Turning the brightness up introduces a bit of light polution.
PrawnPoBoy said:
The whole point of AMOLED is that each pixel is it's own light source which can be completely turned off. True black was possible on every AMOLED phone I've ever used prior to this one.
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No, no... I've owned the Fascinate on Verizon and when in complete darkness you can see a little bit of light emitting from the screen. The Gnex just has more pixels so there's probably more light emitting. But the blacks don't seem to be any less black than my Fascinate. When you turn the screen on the pixels must be excited in order to know when they must turn on or off, this will still emit a miniscule amount light.
PrawnPoBoy said:
I don't see how your background could make a difference. Night mode is completely black. Just look at the screen shot.
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I'm sorry but you're TERRIBLY mistaken and I wish this thread would get deleted before you confuse others! Night mode is simply DIMMED. It is NOT 100% black, but transparently darkened. There is a really easy way you can see this for yourself, simply turn on an animated live wall paper and go into night mode in the clock. You'll se the moving live wallpaper in the background in the "black" areas. That screen shot you took is showing the TRANSPARENCY where it's black. It is NOT actually black there!!!
The GNEX screen is JUST as black as any other SAMOLED Screen if not even more so! If you want to see 100% black - just boot into clockwork mod recovery! the entire background ther is 100% black and you'll see how inky black it looks! That said the status bar at the top of the screen is also black, and blends right in with the bezel.
PrawnPoBoy said:
The whole point of AMOLED is that each pixel is it's own light source which can be completely turned off. True black was possible on every AMOLED phone I've ever used prior to this one.
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when i dim my clock app i can still easily see my background live wallpaper...
Let's leave race out of this. We're all created equal.
Sent from my iPad 2 using Tapatalk
jburnette87 said:
Let's leave race out of this. We're all created equal.
Sent from my iPad 2 using Tapatalk
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well, uhm, white ain't completely white either. haha.
pukemon said:
well, uhm, white ain't completely white either. haha.
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Lol
Sent from my iPad 2 using Tapatalk
Protonus said:
I'm sorry but you're TERRIBLY mistaken and I wish this thread would get deleted before you confuse others! Night mode is simply DIMMED. It is NOT 100% black, but transparently darkened. There is a really easy way you can see this for yourself, simply turn on an animated live wall paper and go into night mode in the clock. You'll se the moving live wallpaper in the background in the "black" areas. That screen shot you took is showing the TRANSPARENCY where it's black. It is NOT actually black there!!!
The GNEX screen is JUST as black as any other SAMOLED Screen if not even more so! If you want to see 100% black - just boot into clockwork mod recovery! the entire background ther is 100% black and you'll see how inky black it looks! That said the status bar at the top of the screen is also black, and blends right in with the bezel.
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What are you smoking? Download that screen shot and check thd color yourself. Its #000000, meaning BLACK. The only confusion is with people not knowing how to go into that mode in the clock. LONG PRESS, not just a simple tap.
Managed to finally find another thread talking about this. Theres even photographic evidence using a long exposure shot.
http://forum.xda-developers.com/showthread.php?t=1371449
I guess the comment that there is always a minimum amount of power in even the black pixels could be accurate.
PrawnPoBoy said:
Managed to finally find another thread talking about this. Theres even photographic evidence using a long exposure shot.
http://forum.xda-developers.com/showthread.php?t=1371449
I guess the comment that there is always a minimum amount of power in even the black pixels could be accurate.
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Yes. From what I have read (OLED information, a few book selections, and an interesting patent) sAMOLED displays include what is called "pixel pre-charging".
This is due to the fact that it is far easier to precisely control the pixel, which corresponds to a "drive voltage", when the starting point is a pre-charge. Its faster and more accurate. However the pre-charge causes light to be emitted. There is no avoiding that. As much as people say "my nexus s/galaxy s/galaxy s 2 have pure black", there is NO SUCH THING even on a sAMOLED display. Contrast ratio for the Galaxy Nexus is 100,000:1 rather than infinite.
Hi, just wanted to put this topic to rest.
Was somewhat disappointed in the screen performance of the Galaxy Nexus, coming from an Galaxy S2. However I reckon it is an issue that can be fixed with drivers.
The blacks on the Galaxy Nexus are far from as good as the SAMOLED+ panel on the SGS2.
Here are some pictures of them side by side with the clock app set to night modus.
Not a deal breaker for me, but I hope this is improved in future updates.
PS: Sorry for the big-ass pictures..
my screen is blacker than the bezel..
Sent from my Galaxy Nexus using XDA App
Godo_PPL said:
Here are some pictures of them side by side with the clock app
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What is your wallpaper, cause I think I can see it in the second to last photo. Like stated above, the clock is only a semi transparency over the wallpaper. Run a screen checker and take pictures of that black, that would be a better test and example
Edit: in all likely hood its just a calibration issue. Franco's kernel improved whites and colors significantly over stock. Personally, I can see that its not 100% black at the moment, but it is 99.999% black. And 100x better than backlit
Sent from my Galaxy Nexus Bugless Beast 4.0.3 lte +franco#5
The technology switches off the pixel so there is no blacker than that if you are not getting pure black then something is wrong most probably the wallpaper is not really black.
Sent from my Galaxy Nexus using Tapatalk
Hi,
My phone suffered a blow and now the display is just black. The digitizer works, I've managed to export the contacts to the SD card to verify and nothing really seems out of order (receiving calls, haptic feedback, etc.).
I ordered an S-LCD replacement display, seeing as the box didn't say AMOLED. It arrived, I changed the display and it didn't work (no backlighting at all, which was present with the damaged display). I contacted HTC and they said that the phone has an OLED display in it, that there are no big differences between AMOLED and OLED and that they can not officially provide me with an answer if I can put an AMOLED display in my Desire.
TL;DR
My question is: Can I buy an AMOLED display and put it in my Desire, which currently has an OLED display in it?
It seems weird, because I haven't read about anyone with an OLED display in their Desire and ebay shows nothing.
Any help is hugely appreciated!
There are only amoled and slcd displays. Obviously amoled implies oled. You cannot interchange them either. If you had slcd (backlit) then that's what you must have.
Perhaps contact HTC again as they or you are confused :s
Sent from my HTC Desire using Tapatalk
The screen was backlit with the original one in it and no backlight with the S-LCD. So I guess it's AMOLED? Thanks for your help.
humi1090 said:
The screen was backlit with the original one in it and no backlight with the S-LCD. So I guess it's AMOLED? Thanks for your help.
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Depends if you're using the word "Backlit" correctly. OLED screens are not Backlit. Hint, LED = Light Emitting Diode. Each pixel emits its own light. LCD IS backlit, meaning light is shone through the pixels.
rootSU said:
Depends if you're using the word "Backlit" correctly. OLED screens are not Backlit. Hint, LED = Light Emitting Diode. Each pixel emits its own light. LCD IS backlit, meaning light is shone through the pixels.
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OK, I'm using it wrong in that case. That makes sense. I mean that the screen seemed to turn on, even though it was all black.
humi1090 said:
OK, I'm using it wrong in that case. That makes sense. I mean that the screen seemed to turn on, even though it was all black.
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That sounds like backlit. A pure black display on OLED will not emit any light. The pixels display black by remaining turned off. Unlike LCD, where even to make black, it emits light as the backlight is on for all pixels.
rootSU said:
That sounds like backlit. A pure black display on OLED will not emit any light. The pixels display black by remaining turned off. Unlike LCD, where even to make black, it emits light as the backlight is on for all pixels.
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The word I got from HTC Sweden was that my display was OLED. I'm almost more confused now.
Boot up the device, connect it to PC and start adb shell.
Type the command:
Code:
dmesg | grep panel
That should tell you what you should have.