OLED screens have been increasingly adopted in smartphones to save power. Screens are still one of the most energy-consuming modules in smartphones.
Microsoft Research propose FingerShadow, a new technique which does local dimming for the screen areas covered by the users' fingers to save power without compromising the user visual experience.
Techniques such as local dimming can further reduce the power consumption of OLED screens, but it is hard to decide which part of the screen could be dimmed, and it often results in compromised user experience.
Intuitively, when a person interacts with their smartphone via the touch screen, the screen areas are covered by their fingers - some of the neighbouring areas could be safely dimmed.
The researchers studied 10 users' touch interaction behaviours and found that on average 11.14% of the screen were covered by fingers. For these 10 people it was estimated that FingerShadow can achieve 5.07%~22.32% power saving, averaging 12.96%, with negligible overhead.
Source: Microsoft Research
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