Does a White Screen (background) use more battery?
NO
A wise old timer told me once... believe 1/2 of what you see & none of what you hear.... so I did a little research on the whole white background & pixel thing... (as I may have stated in the past of it using more battery)..
It doesn't. BUT, can be easily confused with dimming the screen...
1. Dimming the screen only one notch (manually) is so much more significant it's not even funny. Some study's even say the white uses less than the black as it takes a higher voltage to align the crystals to black (filter)
EVERYTHING BELOW THIS POINT IS INSIGNIFICANT & trivial in comparison to screen brightness & dimming. Differences are tiny when compared to the brightness setting.
Having said that...
2. Having a light sensor constantly monitoring ambient light (light meter) power, backlight,
"Automatically adjust backlight"
>uses far more battery then the changing of the color of the lcd crystals also!
Sprint TP2 light sensor location: top left of phone, between htc & left side of speaker screen led, big round hole... press it in a bright light you can see it... test it by adding the proximity quick link "slider button" under add quicklink, turn on & run finger over that area.
Best bet? Use the manual setting to set your backlight! (I don't...)
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wiki stuff:
**As LCD panels produce no light of their own, they require an external lighting mechanism to be easily visible.
On most displays, this consists of a cold cathode
fluorescent lamp that is situated behind the LCD panel.
**LCDs may use one or two large fluorescent lamps as a backlight source,
3. but the different colors are controlled by LCD units, which in effect behave as gates that allow or block the passage of light from the backlight to red, green, or blue paint on the front of the LCD panel.
[1][2][3]
Fact or Fiction?: Black Is Better than White for Energy-Efficient Screens: Scientific American
In fact in newer liquid-crystal display, or LCD, monitors white is actually slightly more energy efficient than black.
So if you're still toiling away in front of a hefty CRT monitor that takes up three-quarters of your desk, then black screens will save you some energy. For those who've graduated to thinner LCD models, black screens are actually sucking up more energy then their white counterparts.
Saving Energy – One Monitor at a Time « Saving Energy
LCD: Consumes same power for all colors on screen. (
white & black being colors) Consumes higher power for higher brightness. Consumes same power for all contrast
Does Black screen saves more Energy than White screen? | September 24th | The Shishir Kumar Blog
LCD displays rely on an array of thin-tube fluorescent bulbs that provide a constant source of light to create a white screen. To make it black, LCDs rely on a diffuser to block this light. As a result, LCDs use more energy than CRTs to display a black screen. Measuring a 17-inch (43-centimeter) LCD monitor, Schindler found that
white required 22.6 watts, while black came in a tad higher at 23.2 watts.
With a 20-inch (50.8-centimeter) LCD, black required 6 percent more energy than white.
Energy Saving with theGreenSpider | theGreenspider - In search of a better world
A pixel in an LCD display typically consists of a layer of molecules aligned between two transparent electrodes. When a voltage is applied across the electrodes, a torque acts to align the liquid crystal molecules parallel to the electric field. This reduces the light shining through from the backlight, and the device appears gray.
If the applied voltage is large enough, the liquid crystal molecules are completely untwisted; the result is that the backlight will then be completely blocked and the pixel will appear black. By controlling the voltage applied across the liquid crystal layer in each pixel, light can be allowed to pass through in varying amounts, correspondingly illuminating the pixel. As such, LCD display technology is different from CRT technology, and therefore colours that are energy efficient to display on a CRT monitor (e.g. black) are not as energy efficient to display on an LCD monitor.
... but then the next pargraph says another study found the opposite... ragging debate..
GTX here I come baby! (I'll at least try it...) :>))