Apple Inc.

Kevin W Sliech

Wei Hsin Yao

Paolo Sacchetto

Marc Albrecht

Mingxia Gu

Arthur L Spence

Pierre-Yves Emelie

Sean C Chang

Chengrui Le

Tobias Jung

Jason N Gomez

Duane M Petrovich

David A Hartley

Chen Zheng

Andrei E Toma

In an embodiment, an electronic device includes an electronic display. The electronic display provides a programmable latency period in response to receiving a first image frame corresponding to first image frame data. The electronic display also displays the first image frame after the programmable latency period and during display of the first image frame, receives a second image frame corresponding to second image frame data. The electronic display also repeats display of the first image frame in response to receiving the second image frame.

Preemptive refresh for reduced display judder

A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Displays with adjustable direct-lit backlight units and adaptive processing

Systems and methods are provided for performing an in-system measurement of power consumption without exclusive use of an in-line current-sense resistor. Indeed, these systems and methods may take advantage of existing parasitic resistances in an electronic device&#x2014;such as resistances that might vary over time and under different operating conditions. To perform an in-system measurement, a digital value of a first voltage caused by an unknown amount of current flowing into a power-consuming component over an unknown resistance may be measured. Before or afterward, a current source may be activated to add or subtract a known amount of current to the unknown amount of current, resulting in a second voltage over the unknown resistance, and a digital value of the second voltage over the unknown resistance may be measured. The power consumption by the power-consuming component can then be calculated from these values.

In-system power usage measurement

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San Francisco, CA, United States of America

Kevin W Sliech