US Patent No. 9,513,739

BACKLIGHT AND AMBIENT LIGHT SENSOR SYSTEM


Patent No. 9,513,739
Issue Date December 06, 2016
Title Backlight And Ambient Light Sensor System
Inventorship Scott M. Herz, San Jose, CA (US)
Roberto G. Yepez, San Francisco, CA (US)
Scott Forstall, Mountain View, CA (US)
Patrick L. Coffman, San Francisco, CA (US)
Assignee Apple Inc., Cupertino, CA (US)

Claim of US Patent No. 9,513,739

1. A method of operating a device which includes a display having a touch screen input device, the method comprising:
operating the display, while the touch screen input device receives one or more inputs, at a brightness level controlled by
an ambient light sensor (ALS) that takes measurements of ambient light around the device;

determining that the device has become inactive;
entering an inactivity dim state in response to determining that the device has become inactive, wherein during the inactivity
dim state (1) the display is operated at a dim brightness level and a first plurality of different ambient light levels do
not effect control of the brightness level of the display and (2) the touch screen input device does not accept inputs until
after a wake input which causes the device to exit the inactivity dim state;

receiving the wake input which is one or more touches on the touch screen input device, wherein the touch screen input device
is a multi-touch input device;

adjusting the brightness level of the display in response to receiving the wake input which causes the device to exit the
inactivity dim state, wherein the brightness level is adjusted with the ALS such that a second plurality of different ambient
light levels measured by the ALS do effect control of the brightness level after receiving the wake input; wherein the adjusting
of the brightness level of the display in response to receiving the wake input, which causes the device to exit the inactivity
dim state, comprises:

receiving, after exiting the inactivity dim state, an ALS value;
if the ALS value is greater than a wake threshold, automatically causing, based on the ALS value, a first increase in the
brightness level of the display;

if the ALS value is less than the wake threshold, automatically causing a second increase in the brightness level of the display;
and

wherein the first increase is greater than the second increase.