Consumer electronic devices generally switch their screens to a low-power or off state when the device is not in active use. During periods of inactivity, the application processor of the device is in a sleep state. For always-on devices, the application processor periodically wakes up to update screen content, e.g., displayed time. However, such wake-up does not include any adjustments of screen brightness, and the screen may be difficult to read during inactive periods despite such periodic updates. This disclosure describes techniques to update screen brightness, and hence maintain screen readability, when the screen is in a low-power state. The techniques leverage periodic wake up of the application processor during inactive periods to enable measurement of ambient light and adjustment of screen brightness.
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D'souza, Julius, "Adjustment of screen brightness in low-power state", Technical Disclosure Commons, (December 21, 2017)