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If I turn on grayscale on my iPhone 6, will the consumption of battery increase or decrease?

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    I would assume that with an LCD it would make no significant difference as the vast majority of the energy consumed by the screen is for the backlight. – JMY1000 May 29 '16 at 4:31
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It makes no difference on the iPhone 6. So neither a reduction, nor extra consumption.

Some sources that tell the same story:

  • From a SuperUser question LCD/LED screens; how color affects the power consumption?:

    Conventional LCDs and LED based LCDs consume power that largely depends only on the intensity of backlight. This means to save power you want to reduce brightness of the screen.

    OLED displays, like those found in Samsung (and other) smartphones, on the other hand, have power consumption that depends on color being displayed.

    As the iPhone 6 uses a conventional IPS LCD panel, it means that the power usage is mainly due to the backlight - and the backlight power usage does not change whether the displayed image is full color or monochrome. However it does change according to the brightness setting and how dark the displayed image is.

  • From CNET's article LED LCD vs. OLED: TV display technologies compared:

    The energy consumption of LCD only varies depending on the backlight setting. The lower the backlight, the lower the power consumption. A basic LED LCD with its backlight set low will draw less power than OLED.

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    Could you elaborate on this, preferably with a source? – grg May 29 '16 at 12:03
  • The iPhone 6 has an IPS LCD display. They do not require more power to display a certain color such as blue compared to a light gray for example. It's not like an AMOLED screen, where black pixels require considerably less color than a white pixel. In any case, the actual draw from the IPS panel itself is tiny compared to the power draw from the backlight. The iPhone backlight uses the same amount of power to display a monochrome image as compared to a full-color image. – jksoegaard May 29 '16 at 15:29
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    I guess you missed the "preferably with a source" part of the question. – user3439894 May 29 '16 at 15:53
  • @user3439894 I guess you missed that it said "preferably" and not "necessarily". Which part of the answer is it you disagree with and want a source on? – jksoegaard May 30 '16 at 7:26
  • The iPhone X has an OLED display, it might be best to update the answer. – TwentyCharMax Jul 26 '18 at 3:24
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I haven't read any analysis of this, but my guess would be that it would make no significant difference. Really all that it does is average out the colors of all pixels (so red green and blue of each pixel are the same rather than different strengths).

Night Shift does use a little extra battery, though. Apparently it uses more energy to show the yellower hues. But this isn't the same as that.

If you want to use less battery, you can turn on Power Saver mode (are you running iOS 9?). That will save energy by reducing certain things that use more power like email fetching.

Other things to do are to close background apps, go to Settings>Privacy>Location Services and go to the bottom and go to system services and disable things you don't need it to use your location for.

Also wifi, Bluetooth, cellular data, these can all be turned off to save battery. Reduce the screen to minimum as well. Don't do anything on the phone you don't need to. If possible put it in airplane mode or shut it altogether.

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I have an iPhone 6 and have set the display to grayscale for an extended period of time. Unfortunately the phone runs extremely hot when on grayscale. I switched back to color mode and have not had any heating issues since.

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