Apple Inc.

Lucent Technologies Inc.

Integrated Device Technology, Inc.

Halo Microelectronics International

Philips Electronics North America Corporation

Halo Microelectronics Co., Ltd.

Maxim Integrated Products, Inc.

Tyco Electronics Logistics Ag

U.S. Philips Corporation

Philips Electronics North America Corporatin

Halo Microelectronics Intermational

Rui Liu

Cheng Kai Chen

Meng-Huan Ho

Songnan Yang

Lijie Zhao

Wendi Chang

Gustavo James Mehas

Tao Qi

Kwang Ohk Cheon

KiBeom Kim

Zhitong Guo

Sunggu Kang

Jaein Choi

Aleksandr N Polyakov

Gloria Wong

Hairong Tang

Shuang Han

Shih Chang Chang

Chin-Wei Lin

Minhyuk Choi

Michael Slootsky

Wen-Jian Gu

Tae Kwang Park

Tsung-Ting Tsai

Chun-Yao Huang

Mark E Jacobs

Enkhamgalan Dorjgotov

Andrew C Lin

Cheuk Chi Lo

Jiangjian Huang

Siqiang Fan

Jean-Pierre Simon Guillou

Yi Qiao

Donghee Nam

Younggu Lee

Paulo P Caldeira

Jun Qi

Hung Sheng Lin

Sang Young Youn

Teruo Sasagawa

Jungmin Lee

Yimin Jiang

Richard W Farrington

Tyler Robin Kakuda

ByoungSuk Kim

Nicholaus Wayne Smith

Lun Tsai

Ying-Chih Wang

Abbas Jamshidi-Roudbari

Chuang Qian

David S Hum

Amit D Bavisi

Yanming Li

Thomas H Liu

Marco A Davila

Wookyung Bae

Tiffany T Moy

John N Border

John Z Zhong

Ming Xu

Shawn Robert Gettemy

Abbas Jamshidi Roudbari

Yi Huang

Lei Yuan

Tong Chen

Hengchun Mao

Mark T Winkler

Graham Butler Myhre

James E Pedder

Jae Won Choi

Jin He

Steven E Molesa

Vijayan J Thottuvelil

Oscar Blyde

Liang Zhao

Brett A Miwa

Bhadrinarayana Lalgudi Visweswaran

Hai Tao

Ivan Knez

Giovanni Carbone

Wenrui Cai

David Harrington

Sofjan Goenawan

Chun-Ming Tang

Qing Chen

Wayne C Bowman

Chan Young Jeong

Nan Zhu

Richard R Garcia

Hitoshi Yamamoto

Jun Jiang

Takahide Ishii

Victor K Lee

Feng Lin

Feng Zhou

Jun Fan

Mark Anthony Belch

Greg P Jorgenson

Chih-Lei Chen

Wei-Liang Hsu

A converter includes L phase legs, each phase leg of the L phase legs comprising a plurality of switches connected in series between an input power source and ground, wherein a first flying capacitor of an Mth phase is cross-coupled between an Mth phase leg and an (M+1)th phase leg, and a first flying capacitor of an Lth phase is cross-coupled between an Lth phase leg and a first phase leg, and wherein switches of the L phase legs are configured such that a ratio of an input voltage of the hybrid multi-phase step-down power converter to an output voltage of the hybrid multi-phase step-down power converter is equal to N/D, and wherein L, M, N are positive integers with M<L, L>2, and D is a duty cycle of the hybrid multi-phase step-down power converter.

Hybrid power conversion system and control method

Pixels in an organic light-emitting diode (OLED) display may be microcavity OLED pixels having optical cavities. The optical cavities may be defined by a partially transparent cathode layer and a reflective anode structure. The anode of the pixels may include both the reflective anode structure and a supplemental anode that is transparent and that is used to tune the thickness of the optical cavity for each pixel. Organic light-emitting diode layers may be formed over the pixels and may have a uniform thickness in each pixel in the display. Pixels may have a conductive spacer between a transparent anode portion and a reflective anode portion, without an intervening dielectric layer. The conductive spacer may be formed from a material such as titanium nitride that is compatible with both anode portions. The transparent anode portions may have varying thicknesses to control the thickness of the optical cavities of the pixels.

Organic light-emitting diode display with patterned anodes and optical cavities

A controller for controlling a multi-phase power conversion system includes a pulse width modulation (PWM) comparator configured to generate a PWM signal based on a ramp signal, a voltage reference signal and a feedback voltage from the power conversion system. A circuit may be configured to generate, based on the PWM signal, PWM signals by delaying the PWM signal with different delay times, and feed the PWM signals to respective switching power converters of the multi-phase power conversion system, to regulate an output voltage of the power conversion system. Each switching power converter may include a control circuit configured to adjust a pulse width of a received PWM signal based on a reference current and an output current of a corresponding switching power converter, to generate an adjusted PWM signal, based on which, an output voltage of the corresponding switching power converter is regulated.

System and method for multi-phase power conversion and control

An apparatus includes a PWM ramp generator coupled between a switching node of a power converter and a first input of a comparator, the PWM ramp generator including a first resistor and a first capacitor connected in series between the switching node and the first input of the comparator, and a second resistor and a second capacitor connected in parallel between the first input of the comparator and a feedback node, and a PFM control circuit including an error amplifier and a current zero crossing detection comparator, wherein the error amplifier is coupled between a second input of the comparator and a reference node, and the PFM control circuit is configured to generate gate drive signal for the power converter when the power converter is configured to operate in a PFM mode.

Buck converter and control method

An organic light-emitting diode (OLED) display may have an array of organic light-emitting diode pixels that each have OLED layers interposed between a cathode and an anode. Voltage may be applied to the anode of each pixel to control the magnitude of emitted light. The conductivity of the OLED layers may allow leakage current to pass between neighboring anodes in the display. To reduce leakage current and the accompanying cross-talk in a display, the pixel definition layer may disrupt continuity of the OLED layers. The pixel definition layer may have an undercut to disrupt continuity of some but not all of the OLED layers. The undercut may be defined by three discrete portions of the pixel definition layer. The undercut may result in a void that is interposed between different portions of the OLED layers to break a leakage path formed by the OLED layers.

Organic light-emitting diode display with pixel definition layers

A control circuit is configured to control a switched capacitor converter to operate in a pulse frequency modulation (PFM) mode. The control circuit includes a one-shot circuitry configured to generate a one-shot pulse to drive the switched capacitor converter to operate in the PFM mode. A PFM mode comparator is coupled to the one-shot circuitry, and is configured to trigger, based on an output voltage of the switched capacitor converter, the one-shot circuitry to generate the one-shot pulse. The switched capacitor converter may be controlled to enter or exit the PFM mode operation based on a trailing current of a flying capacitor of the switched capacitor converter, an output current of the switched capacitor converter, a charging time duration of the flying capacitor when the switched capacitor converter is operating in the PFM mode, or a PFM switching period of the switched capacitor converter operating in the PFM mode.

PFM mode operation of switched capacitor converters

A switched capacitor converter package includes a semiconductor package on a first side of an electrical routing apparatus, a first capacitor and a second capacitor on a second side of the electrical routing apparatus, wherein the first capacitor and the second capacitor are adjacent to each other and connected in parallel, and a third capacitor and a fourth capacitor connected on the second side of the electrical routing apparatus, wherein the third capacitor and the fourth capacitor are adjacent to each other and connected in parallel.

Switched capacitor converter package structure and method

Visibility of the metal mesh touch electrodes can be mitigated using one or more mitigation techniques. In some examples, the boundary between touch electrodes and/or the boundary between a touch electrode and a routing trace of another touch electrode and/or the boundary between two routing traces can be non-linear. In some examples, dummy cuts can be made within an area of a touch electrode region (e.g., while maintaining the same electrical potential for the touch electrode region). In some examples, notches can be made in the metal mesh. In some examples, the location of cuts and/or notches can be optimized to mitigate visibility of the metal mesh. In some examples, some or all of the visibility mitigations may be used in combination in a touch screen.

Metal mesh touch electrodes with visibility mitigations

A method includes turning on a first group of switches of a switched capacitor converter in a battery charging system to establish a first conductive path, and configuring a system voltage at a system bus to charge a first flying capacitor to a predetermined voltage level through the first conductive path, wherein the predetermined voltage level is less than the system voltage, and turning on a second group of switches of the switched capacitor converter in the battery charging system to establish a second conductive path to charge a battery, wherein a sum of a voltage across the first flying capacitor and the system voltage is applied to the battery.

Multi-cell battery charging system and control method

A switched capacitor converter includes a first leg between ground and a first voltage node, a second leg between ground and a second voltage node, a first flying capacitor connected between a first switch common node and a third switch common node of the first leg, a second flying capacitor connected between a first switch common node and a third switch common node of the second leg, a third flying capacitor connected between the first voltage node and the second voltage node, a first upper switch connected between the first voltage node and ground, and a second upper switch connected between the second voltage node and an input terminal.

Switched capacitor converter and control method

A wireless charging receiving circuit includes a coil, a first energy storage unit, a second energy storage unit, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a filter unit, and a control unit. The coil is connected to the first energy storage unit, the second switch unit and the third switch unit. The first energy storage unit and the first switch unit are connected to the fifth switch unit, and the first switch unit is connected with the filter unit and the fourth switch unit at a first connection node. The fourth switch unit is connected with the second switch unit and the second energy storage unit, and the second energy storage unit is connected with the fifth switch unit, the sixth switch units and the coil.

Wireless charging receiving circuit and wireless charging receiver

A converter includes a first phase comprising a plurality of first phase switches connected in series between an input power source and ground, a second phase comprising a plurality of second phase switches connected in series between the input power source and ground, and a first flying capacitor of the first phase and a first flying capacitor of the second phase cross-coupled between the first phase and the second phase, wherein switches of the first phase and switches of the second phase are configured such that a ratio of an input voltage of the hybrid dual-phase step-down power converter to an output voltage of the hybrid dual-phase step-down power converter is equal to N/D, and wherein N is an integer, and D is a duty cycle of the hybrid dual-phase step-down power converter.

A wireless power receiver according to some embodiments includes an integrated circuit which includes: a full-bridge rectifier coupled to receive wireless power from a receiver coil; a wireless receiver controller coupled to control the full-bridge rectifier; a pass device coupled between the full-bridge rectifier and an output; and a configurable controller coupled to the switch, the configurable controller configurable as a LDO controller or a Buck controller. A second controller can be coupled to the configurable controller that interfaces to an external Buck low-side transistor if the configurable controller is the Buck controller and provides GPIO if the configurable controller is the LDO controller. A third controller can be coupled to the full-bridge rectifier, which operates as a full-bridge sync rectifier driver multiplexer to select an external driver for one or more of the rectifier transistors. Other features are also provided.

Wireless power receiver configurable for LDO or buck operation

A single-stage battery charging system includes a hybrid converter comprising a plurality of first power switches connected in series, an inductor and a first flying capacitor, wherein the inductor is connected to a midpoint of the plurality of first power switches, a switched capacitor converter comprising a plurality of second power switches connected in series, and a second flying capacitor, and an isolation switch coupled between the midpoint of the plurality of first power switches and a midpoint of the plurality of second power switches.

Dual converter based single-stage battery charging system and control method

An electronic device may have a support structure that supports a display and lenses. Each lens may be a reflective lens such as a catadioptric lens that receives polarized image light from the display and provides a corresponding image to an eye box. The display may be an emissive display with pixels that include light-emitting diodes. The light-emitting diodes may be overlapped by a light recycling layer such as a reflective polarizer or cholesteric liquid crystal layer. The light recycling layer recycles emitted light to enhance display efficiency.

Electronic device having emissive display with light recycling

Growing community of inventors

Fremont, CA, United States of America

Rui Liu