Using colours on my phone, as I understand, had a cost to the battery, so is their way U can make phone true black n white
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Assuming that b+w shall include grey tones…
a quick search finds this:
I do not use it myself and I never tested it but it seems to be an option.
I wonder how much energy one would really safe compared to simply dimming display brightness.
May change from having “classic” LED or oLED.
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I agree, the intensity of light might be a better way to save energy, intuitively.
Thank you thay good my brightness is low
do you have any reliable source on energy consumption of different display types on the basis of color versus B+W?
Sorry, I don’t understand your question.
My brain may be slow!
I just wondered if you read about that topic and if that’s why you asked in the first place. And if so- if you might provide a link to your source of information. That’s all 
I just stumbled across this, you may check whether this option is available in your phone…
go to system settings → Display → Live Display → enable reading mode (if available) - now, as long as the mode is active the display will show no colors but b+w
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You are gemuise. Thank you. It workrd
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