1# CABC testing 2*[go/cros-cabc-test][go-link]* 3 4## Description 5 6*CABC* or *Content adaptive backlight control* is the technique that will adjust 7panel backlight brightness according to the content. With a bright image showing 8on screen, this won't help saving much power. However, when showing darker image 9on screen, instead of using the same amount of backlight to show that image, 10panel will adjust that image to a brighter version of it and lower the backlight 11brightness to make the perception image similar but use lower power. 12 13## CABC verification autotest 14 15There are 2 version of this test. 16* `power_Display.cabc` : run at default brightness level (usually 80 nit). 17* `power_Display.cabc_max_brightness` : run at full brightness. 18 19The test makes Chrome display the following pattern for 20 seconds with 20white pattern between each pattern. 21 22* Greyscale level from 0% to 50% with 10% interval. 23* Checker pattern with black and greyscale 100% to 50% with 10% interval. 24 25| Type | Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | Pattern 5 | Pattern 6 | 26|-----------|-------------|------------|------------|------------|------------|------------| 27| Greyscale | ![0%][g0] | ![10%][g1] | ![20%][g2] | ![30%][g3] | ![40%][g4] | ![50%][g5] | 28| Checker | ![100%][c0] | ![90%][c1] | ![80%][c2] | ![70%][c3] | ![60%][c4] | ![50%][c5] | 29 30[go-link]: http://goto.google.com/cros-cabc-test 31[g0]: png/black.png 32[g1]: png/grey10.png 33[g2]: png/grey20.png 34[g3]: png/grey30.png 35[g4]: png/grey40.png 36[g5]: png/grey50.png 37[c0]: png/checker1.png 38[c1]: png/checker90.png 39[c2]: png/checker80.png 40[c3]: png/checker70.png 41[c4]: png/checker60.png 42[c5]: png/checker50.png 43 44
