As a result of research that dark mode has 'almost no effect' on the battery of smartphones, what is the effective use of dark mode?
How much battery does dark mode save? | Proceedings of the 19th Annual International Conference on Mobile Systems, Applications, and Services
https://dl.acm.org/doi/10.1145/3458864.3467682
Dark mode may not save your phone's battery life as much as you think, but there are a few silver linings --Purdue University News
https://www.purdue.edu/newsroom/releases/2021/Q3/dark-mode-may-not-save-your-phones-battery-life-as-much-as-you-think,-but-there -are-a-few-silver-linings.html
The organic EL (OLED) used in many smartphones in recent years does not use a backlight like a liquid crystal display, so it is said that the dark mode, which uses a lot of dark colors, can prolong the battery life .
However, most of the 'light mode and dark mode power consumption comparison tests' that have been conducted so far check the power consumption of the entire smartphone and the battery life, so it is necessary to know only the power consumption of the display accurately. Couldn't.
Therefore, Professor Yu Charlie Hu of Purdue University and Ph.D. student Pranab Dash built a power consumption calculation model that can separate the power consumption of the organic EL display from other parts, and measured the power consumption based on it. Developed the tool 'Per-Frame OLED Power Profiler (PFOP)'. Enable dark mode with the most common screen brightness setting of '30-50%', 6 of 'Google Maps' 'Google News' 'Phone by Google' 'Google Calendar' 'YouTube' 'Calculator' I investigated the power consumption when using the Google app for 60 seconds.
The results of this experiment show that dark mode saves only '3-9% on average' of power compared to light mode, and the battery life is not noticeably extended. Only four Android devices, 'Pixel 2, 4, 5' and 'Moto Z3,' were used in the experiment, but the research team said, 'iPhone X and other Apple devices can do the same. There is sex. '
On the other hand, another experiment conducted by changing the screen brightness setting revealed that there are two situations in which dark mode can be expected to be effective.
◆ 1: Case of using dark mode in bright places such as outdoors
For example, if you say 'use your smartphone while watching sports outdoors on a sunny day', the 'automatic brightness adjustment' function will make the screen very bright, which will consume a lot of battery power.
Then, as a result of Professor Hu et al. Comparing the power consumption of the light mode and the dark mode when the brightness is 100%, it was found that the dark mode can save the battery consumption by '39 to 47%' on average. From this, the research team says, 'If you use dark mode with a very bright screen, you are more likely to use your smartphone longer than if you used it in light mode with the same brightness.'
◆ 2: Cases where eyes get tired in dark light mode
As mentioned above, if the brightness is 50% or less, the power consumption is almost the same between light mode and dark mode. In fact, when using the Google News app on Pixel 5, it was confirmed by experiment that the power consumption is the same between the state of 'brightness 20% in light mode' and the state of 'brightness 50% in dark mode'. Has been done.
For this reason, the research team said, 'Since the power consumption is the same in the dark light mode and the bright dark mode, even if you want to increase the brightness by switching to the dark mode to reduce eye strain,' the research team will increase the power consumption. You don't have to worry about it. '
Professor Hu and others are planning to create a power consumption measurement application 'Android Battery +' that applies the measurement tool PFOP developed this time in collaboration with the application developer and release it in 2022.
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