Apple Inc.

Broadcom Corporation

Other

Sanmina-sci Corporation

Broadom Corporation

Asif Hussain

Jingdong Chen

Manisha P Pandya

Mohammad Jafar Navabi-Shirazi

Yanhui Xie

Behzad Mohtashemi

Christiaan A Ligtenberg

Manisha Pandya

Mikael M Silvanto

Brett W Degner

Zheng Gao

Dinesh C Mathew

Keith J Hendren

Ron Alan Hopkinson

Robert Y Cao

Chang Zhang

Simon R Lancaster-Larocque

Bryan W Posner

Alex Joseph Lehmann

Sesha Thalpasai Panguluri

Alejandro Lara Ascorra

Ji Yeoul Ryoo

Karan S Jain

Ming Gu

Supratik Datta

Wael William Diab

Jun Qi

Nicholas Ainsley Sims

Feng Guo

Adrian E Sun

John Perzow

Zhiyuan Hu

Nileshbhai J Shah

Farzan Roohparvar

Venkataraman V Iyer

Omar Alnaggar

Yang Zhang

Shimon Elkayam

Eric G Smith

Hemanth Nekkileru

Steven J Sfarzo

Brad Lee Patton

Nandita Venugopal

Andrew P Aitken

Martin McNarney

Joshua Chien

Sushil Dhiman

Palathingal Frank

Jy Ryoo

Simon R Lancaster-Laroque

A portable computer includes a display portion comprising a display and a base portion pivotally coupled to the display portion. The base portion may include a bottom case and a top case, formed from a dielectric material, coupled to the bottom case. The top case may include a top member defining a top surface of the base portion and a sidewall integrally formed with the top member and defining a side surface of the base portion. The portable computer may also include a sensing system including a first sensing system configured to determine a location of a touch input applied to the top surface of the base portion and a second sensing system configured to determine a force of the touch input.

Device having integrated interface system

A battery powered electronic device can include a battery to power one or more loads, a first DC-DC converter having an input coupled to the battery and an output, and a second DC-DC converter cascaded with the first DC-DC converter and coupled to a second load subject to pulsed operation. The first and second converters may be configured so as to isolate the one or more loads from transients associated with the pulsed operation of the second load. The second converter may have an input coupled to the output of the first converter and an output coupled to the second load. Alternatively, the second converter may be a bidirectional converter having first terminals coupled to the output of the first converter and second terminals coupled to an energy storage device.

Mitigation of battery output voltage ripple under pulse load

A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.

Current load transient mitigation in display backlight driver

Systems and methods for preserving a pulse width modulation (PWM) resolution while increasing the frequency of a pulse width modulation (PWM) clock are provided. An electronic display backlight system may include a backlight element and backlight dimming circuitry. The backlight element may be driven according to a pulse width modulation (PWM) signal over a PWM clock cycle equal to a multiple M of a baseline PWM clock frequency associated with a baseline PWM resolution. The backlight dimming circuitry may receive a brightness code of the baseline PWM resolution and generate the PWM signal at least in part by dividing the brightness code by M.

Systems and methods for increasing a pulse width modulation frequency while preserving resolution

Power converters can include a plurality of switching devices and a combination of one or more inductors and one or more flying capacitors. Both boost and buck converters may employ such topologies, and can achieve high efficiency and small size in at least some applications, including those with high conversion ratios. A control circuit can generate a first pair of complementary gate drive signals to drive a first complementary switch pairs and a second pair of complementary gate drive signals to drive a second complementary switch pair. The control circuit can vary a phase shift between the first pair of complementary gate drive signals and the second pair of complementary gate drive signals to regulate the flying capacitor voltage.

Inductive flying capacitor converters and control techniques therefor

A device includes a display portion that includes a display housing and a display within the display housing. The device also includes a base portion flexibly coupled to the display portion and comprising a glass member defining a keyboard region configured to receive user input, a first haptic actuator configured to produce a first haptic output at a first area of the keyboard region, and a second haptic actuator configured to produce a second haptic output at a second area of the keyboard region that is different from the first area.

Components associated with receiving user touch input, receiving user force input, and providing haptic output interface are integrated into a unified input/output interface that includes a transducer substrate formed with a monolithic or multi-layer body having a number of electrodes disposed on surfaces thereof. Electrodes are selected by a controller to provide touch input sensing, force input sensing, and haptic output.

Unified input/output interface for electronic device

A display may have display layers that form an array of pixels. The array of pixels may be illuminated using a backlight unit. The backlight unit may include multiple strings of light-emitting diodes (LEDs). The multiple LED strings may be controlled by one or more backlight driver integrated circuits (ICs). In a multi-driver IC architecture, an enable signal may be used to set a desired phase delay between the multiple ICs. One or more of the LED strings may exhibit a short fault. Depending on the number of faulty LED strings, the backlight unit can selectively throttle the maximum brightness of the display. The LED strings may receive an output voltage from a DC/DC converter and may be driven using a current driver. The DC/DC converter may be controlled by a headroom feedforward control circuit to ensure sufficient headroom for the current driver while suppressing acoustic noise.

Methods and apparatus for controlling display backlight

A portable computer includes a display portion comprising a display, a base portion pivotally coupled to the display portion and including a glass top case. The glass top case defines an exterior surface and a keyboard opening through the glass top case from the exterior surface to an interior surface. The portable computer further includes a keyboard positioned at least partially within the keyboard opening and comprising a substrate, a key configured to move relative to the substrate, and a fabric cover disposed over the key and defining a user interface surface of the key.

Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may operate a light-emitting diode using a multi-peak pulse-width-modulation signal. The control circuitry may include a multi-stage driver having a relatively larger driver stage for providing a direct current through a light-emitting diode and a relatively smaller driver stage configured to cooperate with a pulse-width-modulation controller to pulse-width-modulate a current through the light-emitting diode.

Split driver backlightsystems and methods

A display may have an array of pixels illuminated using a backlight unit. The backlight unit may include multiple strings of light-emitting diodes (LEDs) and a boost converter for providing an output voltage to the multiple LED strings. The boost converter may have a single-phase single-switch, single-phase multi-switch, and/or multi-phase multi-switch configuration, where the switches are turned off when the peak current is reached. When transitioning from a single phase to a dual phase operation, the second (slave) phase current may be slowly ramped up. When transition from the dual phase to the single phase operation, the output voltage may be elevated while slowing ramping down the slave phase current. The boost converter may include a current detection circuit for adjusting the peak current of each phase to balance the average current levels. The boost converter may also include an in-rush current controller configured to sense a short fault.

Aspects of the subject technology relate to display circuitry such as backlight control circuitry for operating parallel strings of light-emitting diodes (LEDs). A voltage supply circuit of the backlight control circuitry provides a common supply voltage to the strings of LEDs. Headroom control circuitry samples a residual voltage at the end of each string, determines a minimum of the residual voltages, and provides feedback, based on the determined minimum voltage, to the voltage supply circuit. A headroom control feedback loop may be provided including sampling lines coupled to the second end of each string of LEDs for sampling a residual voltage of each string. Headroom control circuitry may modify the supply voltage based on the minimum residual voltage. Sample-and-hold circuitry may be provided that holds the sampled residual voltages until the voltage supply circuit is ready for an update.

Display backlight headroom control systems and methods

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San Jose, CA, United States of America

Asif Hussain