Hi
As in the title, just wondered if you had a white screen and a black screen, which one needs more power for the lcd to display? Or is it the same? Or to produce black needs no power as lcd screens are black anyway even when its turned on before its displaying anything?
Thanks
w
Pixels on an LCD screen don't actually emit light (that's the backlight's job). Hence, the lowest power state for an LCD that's powered on is white, because all the pixels are "powered off" in that state. However, the power consumption of those things is so small that you probably won't see any measurable difference.
red 0%
green 0%
blue 0%
= black
red 100%
green 100%
blue 100%
= white
you do the math
Neemo said:
red 0%
green 0%
blue 0%
= black
red 100%
green 100%
blue 100%
= white
you do the math
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Actually, you need to understand how the display works to answer the question correctly.
With an LCD you have a white backlight that is on no matter what the display is displaying; white, black, images... Each pixel is made of a red, green, and blue part, each with a shutter in front of it. White would be all shutters open and black all shutters closed.
Some LCDs use power to open shutters and these are called "normally black" because unpowered, all shutters will be closed. Others are the opposite, requiring power to close the shutters, and are called "normally white."
So the answer is that a normally white LCD will use less power displaying white, and a normally black LCD will use less power displaying black. But it really doesn't use that much power to open and close the pixel shutters, so the difference isn't that big.
OLED displays (such as AMOLED) are different, though. Each pixel actually produces its own light, so for these white uses way more energy than black.
maxh said:
So the answer is that a normally white LCD will use less power displaying white, and a normally black LCD will use less power displaying black. But it really doesn't use that much power to open and close the pixel shutters, so the difference isn't that big.
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The difference is so small as to be unmeasurable for all practical purposes; you won't notice any difference whatever to battery life by changing your colour scheme, for example.
As has been noted by others, OLED displays work very differently - there, you can make a big difference to power consumption by keeping everything as dark as possible.
Related
I cracked my screen when I drop my phone, so I just brought a digitizer and replaced it. The phone works fine with the new digitizer, but now the screen is dim and greenish. I already turn the screen brightness to maximum, but it's only 25% of the original brightness. When I look at the pixel closely, it seem like I lose half of the pixels.
Anyone has similar situation?
Did you check the screen connecting flex cable, it seems that you lost one component (Red, Green, Blue), did you try opening a clear white image and seeing what do you actually see?
celelivada said:
Did you check the screen connecting flex cable, it seems that you lost one component (Red, Green, Blue), did you try opening a clear white image and seeing what do you actually see?
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Click to collapse
thanks for the reply.
i checked all the cables, and they are connected (unless i damaged them during the process). I even tried disconnecting them and reconnect again, but still no change.
the white actually appear to be white, but the black is dark green.
it depends now waht does "dark green" meen to you. LCD screens dont have a true black, but a purple, green (or whatever color) shade over the black. I think it is due to the digitizer, it is not the same quality and it isnt as transparent as the stock one. Images (not screen shots, but real photos) of the screen can help.
We know that our old Note have an AMOLED display, this means that the black pixels are almost turned off, so you can experience a good and sharp image instead of blueish, LCD TFT displays. It's a bit buggy because of dead pixels from manufacturer, clipping issue in videos and screen burn-in (not in every phone, just in some). Another complication of this screen is that if you put brightness at lowest, it's still very bright so if you want to read something in your bed, or use the phone without iluminating the whole room, there's an app that you will like:
Galactic Night
This app have much great features: you can use the phone at any combination of colors you want: Black and Red, Black and Blue, Black and Green, No blue (to prevent insomnium), B&W etc.
So what the hell have this to do with the battery? Well, it's easy, think this:
You're running low battery, and need extra minutes to finish your task. Use Black and Red setting
You are in a travel, without any charger, and want your phone turned on all the day. Use Black and Red setting
If you use this setting, your battery will be incremented to a 25% to 40% in duration. Also as it uses only red pattern of pixels and black, your phone will have less and it will be perfect to read at night (even it will be more healthy as it doesnt uses blue leds which causes insomnium).
The app is free to use and requires ROOT. Works only on Samsung phones with amoled screens.
******USE IT AT YOUR OWN RISK****** Using these options for a long time (DAYS without turning off the screen for even a single second) will result a permanent lost of the used color.
LINK: GOOGLE PLAY
Nice share ...i will try for battery backup.
Good finding mate.
Thanks
Sent from my GT-N7000 using Tapatalk
Thank you @galaxynote2, just looking for something like this. :good:
Maybe I'm just a little too picky or ocd but I noticed my charge status LED goes from a brightly lit red just before reaching 100%, to an extremely dim (barely visible) green when the battery has been fully charged. When I hit the home or power button to turn the screen on then back off, the green LED is visible and bright. Anyone else notice this?
[UPDATE] Never mind, I'm an idiot... I should've known this, the light sensor dictates the LED brightness level.
I don't know if samsung was just rushing to get these replacement devices out and had to speed through the assembly process but my device looks just that way. The overlay is noticeably off center to the left across the top where the sensor, camera and iris scanner are located. To the left of the home button there is a thin vertical line indentation as if there is a small dent on the shell of the device under the overlay.
Once again, could be I'm just overly critical, but for a device pushing the $900 retail mark I expect more. Venting complete...Still love my Note 7:good:
Today my screen made some funny stuff for about a minute the screen sides are black and random colors were splashed on the screen (blue, red, green etc..) the screen was half messed up and the other half where you could actually see the UI the colors were all faded. This stayed for about a minute and then returned to normal.
I'm worried now that this is the end of the life of this screen. Anybody had this issue? Note that the phone useage was normal not even heavy and it did not drop or anything of that sort
I have found a rare problem with the s10e display.While increasing brightness slowly i mean really slowly i can see display color changing from normal to slight purple this happens again and again while dragging to its max slowly and steadily.can be seen clearly on white back ground (low light environment recommended).is this normal let me know guys , anyone with the s10e thank you.