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NRG roms - which CHT version uses most power?

I really like the GTX version of NRGZ28's CHT rom, but it strikes me that with all that wite in the screen it will use more power.
Can anyone confirm that's the case?
cheers

hmm maybe I missed something but why would a color cause more battery drain.
you could also use the leocpuspeed to unclock your cpu thus saving some power.

griZlyadams said:
I really like the GTX version of NRGZ28's CHT rom, but it strikes me that with all that wite in the screen it will use more power.
Can anyone confirm that's the case?
cheers
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Technically, your assumption is not correct. Your HD2 comes with an LCD, displaying the white color does not affect power consumption here.
In an LCD, the backlight is always on when contents are displayed - power consumption is only reduced if you dim the backlight, or the device goes into standby mode.
In a simple description: The LC molecules actually turn like a shield to let the backlight through or not. Each pixel on the screen is divided into three subpixels (red, green, blue) to produce the colors.
If one pixel (eg all subpixels) gets the full shield, it shows black - but the backlight is actually still on.
In the sum: Maybe the power consumption with your new theme goes up just because you look at it more often... isn´t that a funny side effect?

From my understanding of how LCD screens work the backlight is permanently on and energy is used to block the light coming through the colour pixels thus more energy is used to produce a black screen than a white screen!

johnk1973 said:
From my understanding of how LCD screens work the backlight is permanently on and energy is used to block the light coming through the colour pixels thus more energy is used to produce a black screen than a white screen!
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That sounds interesting. Any source for that?

makes sense (no pun intended !), for some reason I had it in my head that these were amoled screens.....wishful thinking I guess!

Yes, black uses more power on this type of screen (on a CRT it's reversed, the black uses less power than white). But you won't notice any real gain (a few minutes a day at best) since the power hungry part is the backlight, and because when the device isn't in standby you are probably using it (I'm not someone who look at the home screen and do nothing more all day, and don't know anyone doing that ). 10 minutes of web browsing will use more power even on a white background than 30 minutes of full black home screen.

[TIP] Battery Save

Hello guys,
To save battery thru screen use as much white background as possible cuz LCD Screen uses White pixel backlight and white will use less battery,, it's the complete opposite of amoled screen while they use black pixel.
To save battery more turn on gps but device only, cuz the Google play services (locations)
Use the wifi and network to share the location, so leave it at device only and the GPS will be offline until you use an app needs GPS
More tips I will share,
Thanks

this with lcd screen is bull****. only way to save battery on display is to set brightness down.
backlight for the whole screen makes the light, not the pixels itself like on amoled.

He actually is true but the effect is so low it doesn't matter.
To Display a black (or dark) image the LCD needs to block the backlight (which is always on) and this in fact requires more energy than letting the light pass and displaying a white screen.

An issue I never understood (Ultra power saving mode)

Hi there !
Just call me a noob - but I don't understand a feature of that "Ultra power saving mode". It's the black and white display.
If we dare to ignore the special features of a pentile matrix, it comes down to a pixel consisting of three subpixels: Red, Green, Blue (RGB).
To display greyscales of the color "white" , we need ALL THREE subpixels illuminated: [•••]
For displaying the colors "red", "green" or "blue" we'd need just ONE subpixel illuminated: [•] or [•] or [•]
Clear so far ? - Well.
AMOLED displays control each subpixel directly - many subpixels illuminated = high energy drain, few subpixels illuminated = low energy drain.
So is there any sound reason for choosing a display color (grey) which always needs ALL subpixels illuminated, thus causing three times the battery drain a red, green or blue display would cause ?
Do I overlook something ?

AMOLED display is just multiple lights producing images. The reason the ultra power saving mode is black and white is because AMOLED display will turn off the light in the subpixels to produce the black color.

Chefproll said:
Hi there !
Just call me a noob - but I don't understand a feature of that "Ultra power saving mode". It's the black and white display.
If we dare to ignore the special features of a pentile matrix, it comes down to a pixel consisting of three subpixels: Red, Green, Blue (RGB).
To display greyscales of the color "white" , we need ALL THREE subpixels illuminated: [•••]
For displaying the colors "red", "green" or "blue" we'd need just ONE subpixel illuminated: [•] or [•] or [•]
Clear so far ? - Well.
AMOLED displays control each subpixel directly - many subpixels illuminated = high energy drain, few subpixels illuminated = low energy drain.
So is there any sound reason for choosing a display color (grey) which always needs ALL subpixels illuminated, thus causing three times the battery drain a red, green or blue display would cause ?
Do I overlook something ?
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U r right ...
So... Instead of white pixel there should be one of 3 main colors ( red blue green ) in order to minimize the power consumption .
Using white pixel makes no sense for AMOLED displays ...

does having a red blue or green tinted display make any sense to you ? that is why.

Found this information, maybe it is useful:
An AMOLED doesn't have a backlight at all.
Instead, each little sub-pixel is like a tiny red, blue, or green colored light.
If the screen is instructed to display black, it doesn't need to block any light, it simply doesn't light up any of the little colored sub-pixels.
So theoretically, black pixels save you a lot of power because those pixels can be turned completely off.
However, people sometimes make the mistake of thinking this is a function of brightness—that dark colors like gray are similarly efficient.
Source: http://www.greenbot.com/article/283...interface-really-save-on-amoled-displays.html
Kind regards, Stefan.

zurkx said:
does having a red blue or green tinted display make any sense to you ? that is why.
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Did you understand the purpose of an energy saving feature ? - I'll tell you. It's for saving energy.
Not for giving you a pretty sight.
Basic information (I thought everybody knew that): AMOLED indeed is like millions of single LEDs. The more illuminate, the more power you need.
Black screen: NO energy consumption. White screen: Highest energy consumption (because white light consists of red, green and blue light). Red, blue or green screen: 1/3 energy consumption, because just one out of each three subpixel LEDs is lit, thus just one out of three subpixel LEDs consumes energy.
So you need ONE LED for displaying a red, blue or green pixel. But you need THREE LEDs for displaying a white or grey pixel, so it's three times the power consumption.
Now again: It's an energy saving feature. With a green, red or blue screen, energy consumption would be 33 %. But with a grey screen, energy consumption is 100 %.
So where's the sense ?

you're incorrectly making the assumption that an active subpixel always draws full power.
if a subpixel is used to display #808080(which should be a very average grey) it should use around 50% of what it uses when used for displaying #FFFFFF(white)
I don't know how power consumption scales compared to brightness, but using multiple subpixels at 25-40% instead of 1 subpixel at 100% would save a lot of power if power consumption scales with an upward curve as brightness increases.
I don't know the exact characteristics of OLEDs or the effect that pentile has on battery usage so I can't exactly tell why it would drain less in B&W than in color, but grey definitely drains less power than white.
1 interesting thing I just found out:
while I've had several OLED devices, the Note 4 is actually the only one I've ever seen that turns off subpixels to display pure black(#000000)
other devices keep subpixels at their lowest active setting, resulting in a faint green/grey glow.(effectively #010101-#101010, as the lowest setting can vary in brightness between different subpixels)
a downside to this is that black causes ghosting, as it takes a subpixel significantly more time to wake up than to increase brightness.
EDIT: I just did some calculations and comparisons, although this example specifically applies to RGB screens you'd notice a similar effect in RGBG screens.
to create the B&W equivalent of a single colored subpixel at 100% brightness you'd need 3 subpixels to be at only 28%.
even if power consumption is linear to brightness it would still mean a drop in display power consumption of 16%

no its for pretending to save energy not to actually save it. it looks like its an eink screen in that mode so people are happy. thats the sense.

Possibly another reason for choosing black and white instead black and green or other colors to have subpixels "age" at similar rate instead one color loosing brightness at faster rate than others.
Sent from my SM-N910T using XDA Free mobile app

color display screen issue.(1st time to use amoled screen)

I just brought a yotaphone 2 and notice the screen (color side) will change to red/purple in color (especially the dark color area , like the black one) when i set the brightness to a low level(below 30%)
is it normal issue to all amoled display??
this is my 1st time to use amoled phone

nope, it could be damaged during transport. check if yellow spots appear, that's usually the sign of damage. nothing to worry about, it's just annoying

It is normal - if you are in dark and you lower brightness less than 20% it gets purple.

s7 edge screen flickering

i recently bought a used s7 edge. the cellphone's display is damaged buf overall it works fine. except for a few issues mainly related to light sensor according to my understanding.
1: the display flickers when auto brightness turned off or when brightness is set to anything less than maximum
workaround: i installed screen filter app to control the brightness
2: the screen goes to green screen of death when device is put to sleep
workaround : turn AOD to always on and never Turn it off
3: the display goes to green death screen during call and wont get normal unless call is ended and screen is locked and turned on..
4 : at AOD ,the screen flickers at night time or in a dark place but gets back normal in bright light..
info i need : i thought what if it was possible to change the android framework values for the light sensor so that no matter whatever the light of the surrounding may be.. the device will always think it's in bright light.
for example if the settings for current values are
high 5000 medium 2000 low 600
then i change it to
high 1000 medium 500 low 25
so that the device will always think its in full bright area..
can anyone help me in achieving this goal? thanks