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 7 panel backlight brightness according to the content. With a bright image showing 8 on screen, this won't help saving much power. However, when showing darker image 9 on screen, instead of using the same amount of backlight to show that image, 10 panel will adjust that image to a brighter version of it and lower the backlight 11 brightness to make the perception image similar but use lower power. 12 13 ## CABC verification autotest 14 15 There 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 19 The test makes Chrome display the following pattern for 20 seconds with 20 white 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
