Joerg Reisenweber <jo...@openmoko.org> writes: > A completely white screen with ~40% backlight consumes same amount of power > as > a completely black screen (-content) with backlight "dim" (=off) > > (=> a black screen eats as much power as a backlight set to 40%) > > (DUT: FR A7 SHR-U0808)
I wrote http://iki.fi/lindi/openmoko/display-current-measurement1.pl to test this. However, here white screen with 40% brightness consumes significantly more than black screen with 0% brightness: >dbg running echo 102 > /sys/class/backlight/gta02-bl/brightness >dbg sleeping for 60 seconds for current to stabilize >dbg taking 10 samples with 10-second delays >dbg current now 102750, mean 102750.0000, deviation -1.0000, range >0.0000 >dbg current now 99750, mean 101250.0000, deviation 2121.3203, range >3000.0000 >dbg current now 99750, mean 100750.0000, deviation 1732.0508, range >3000.0000 >dbg current now 91875, mean 98531.2500, deviation 4657.4034, range >10875.0000 >dbg current now 91875, mean 97200.0000, deviation 5012.9520, range >10875.0000 >dbg current now 91875, mean 96312.5000, deviation 4982.9396, range >10875.0000 >dbg current now 90750, mean 95517.8571, deviation 5011.1483, range >12000.0000 >dbg current now 90750, mean 94921.8750, deviation 4936.1718, range >12000.0000 >dbg current now 101812, mean 95687.4444, deviation 5157.0280, range >12000.0000 >dbg current now 101812, mean 96299.9000, deviation 5233.6376, range >12000.0000 >dbg running xset dpms force off >dbg sleeping for 60 seconds for current to stabilize >dbg taking 10 samples with 10-second delays >dbg current now 48000, mean 48000.0000, deviation -1.0000, range 0.0000 >dbg current now 48000, mean 48000.0000, deviation 0.0000, range 0.0000 >dbg current now 52687, mean 49562.3333, deviation 2706.0407, range 4687.0000 >dbg current now 52687, mean 50343.5000, deviation 2706.0407, range 4687.0000 >dbg current now 52687, mean 50812.2000, deviation 2567.1756, range 4687.0000 >dbg current now 62250, mean 52718.5000, deviation 5203.4787, range >14250.0000 >dbg current now 62250, mean 54080.1429, deviation 5961.7104, range >14250.0000 >dbg current now 62250, mean 55101.3750, deviation 6229.5975, range >14250.0000 >dbg current now 54562, mean 55041.4444, deviation 5830.0278, range >14250.0000 >dbg current now 54562, mean 54993.5000, deviation 5498.6935, range >14250.0000 _______________________________________________ hardware mailing list hardware@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/hardware
