Patents by Inventor Derek K. Shaeffer

Derek K. Shaeffer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10885852
    Abstract: An electronic device includes a display having an active array and a reference array. The active array includes a pixel and the reference array includes a reference pixel. The electronic device also includes processing circuitry communicatively coupled to the display. The processing circuitry is configured to instruct the active array to drive the pixel based at least in part on a set of degradation ratios and gamma tap points for each brightness setting of the display based at least in part on a reconstructed current-voltage curve.
    Type: Grant
    Filed: June 4, 2020
    Date of Patent: January 5, 2021
    Assignee: Apple Inc.
    Inventors: Sheng Zhang, Chih-Wei Yeh, Yunhui Hou, Chaohao Wang, Wei H. Yao, Paolo Sacchetto, Derek K. Shaeffer, Henry C. Jen, Shingo Hatanaka, Hasan Akyol, Mahdi Farrokh Baroughi, Hopil Bae
  • Publication number: 20200388215
    Abstract: An electronic device includes an electronic display having an active area comprising a pixel. The electronic device also includes processing circuitry configured to receive image data and predict a change in threshold voltage associated with a transistor of the pixel based at least in part on the image data. Furthermore, the processing circuitry is configured to adjust the image data to generate adjusted image data based at least in part on the predicted change in threshold voltage.
    Type: Application
    Filed: May 7, 2020
    Publication date: December 10, 2020
    Inventors: Hei Kam, Junhua Tan, Wei H. Yao, Shihchang Chang, Derek K. Shaeffer, Chaohao Wang, Hyunwoo Nho, Yun Wang, Baris Cagdaser, Majid Gharghi, Yongjun Li, Aida Raquel Colon-Berrios, Mohammad Reza Esmaeili Rad, Hyunsoo Kim, Alex H. Pai, Hsin-Ying Chiu, Jiun-Jye Chang, Ching-Sang Chuang, Xin Lin
  • Patent number: 10854129
    Abstract: Hybrid architectures and method methods of operating a display panel are described. In an embodiment, row driver and pixel driver functions are combined in a group of backbone hybrid pixel driver chips, wherein global signal lines are distributed to the backbone hybrid pixel driver chips, where the global signals are manipulated and distributed to a row of pixel driver chips.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: December 1, 2020
    Assignee: Apple Inc.
    Inventors: Xiang Lu, Mahdi Farrokh Baroughi, Xiaofeng Wang, Derek K. Shaeffer, Henry C. Jen, Hopil Bae
  • Publication number: 20200302871
    Abstract: An electronic device includes a display having an active array and a reference array. The active array includes a pixel and the reference array includes a reference pixel. The electronic device also includes processing circuitry communicatively coupled to the display. The processing circuitry is configured to instruct the active array to drive the pixel based at least in part on a set of degradation ratios and gamma tap points for each brightness setting of the display based at least in part on a reconstructed current-voltage curve.
    Type: Application
    Filed: June 4, 2020
    Publication date: September 24, 2020
    Inventors: Sheng Zhang, Chih-Wei Yeh, Yunhui Hou, Chaohao Wang, Wei H. Yao, Paolo Sacchetto, Derek K. Shaeffer, Henry C. Jen, Shingo Hatanaka, Hasan Akyol, Mahdi Farrokh Baroughi, Hopil Bae
  • Patent number: 10762836
    Abstract: An electronic display row drivers or column drivers that send reference currents or voltages to microdrivers to be used to drive micropixels to particular levels. The microdrivers, in turn, ship current to micropixels that display images based at least in part on the shipped current.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: September 1, 2020
    Assignee: Apple Inc.
    Inventors: Hopil Bae, Wei H. Yao, Mohammad B. Vahid Far, Yafei Bi, Xiaofeng Wang, Thomas Charisoulis, Hasan Akyol, Henry C. Jen, Derek K. Shaeffer
  • Patent number: 10755618
    Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), correlated-correlated double sampling (CDS-CDS) and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors that generate image data according to sensing operations. The one or more processors may reference a sensing pattern as part of sensing operations. Applying test sensing signals based on the sensing pattern may help reduce error associated with sensing operations.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: August 25, 2020
    Assignee: Apple Inc.
    Inventors: Hung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B. Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-Il Chang, Shinya Ono, Jesse Aaron Richmond, Yafei Bi, Derek K. Shaeffer, Myungjoon Choi, Shiping Shen
  • Patent number: 10714011
    Abstract: A mobile electronic device includes a display having an active array and a reference array. The active array includes a pixel and the reference array includes a reference pixel. The mobile electronic device also includes processing circuitry communicatively coupled to the display. The processing circuitry is configured to instruct the active array to drive the pixel based at least in part on a current-voltage relationship of the pixel and a reference current-voltage relationship of the reference pixel.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: July 14, 2020
    Assignee: Apple Inc.
    Inventors: Sheng Zhang, Chih-Wei Yeh, Yunhui Hou, Chaohao Wang, Wei H. Yao, Paolo Sacchetto, Derek K. Shaeffer, Henry C. Jen, Shingo Hatanaka, Hasan Akyol, Mahdi Farrokh Baroughi, Hopil Bae
  • Patent number: 10650741
    Abstract: An electronic device includes a display having a reference array that includes a first pixel. The display also includes a first emission power supply coupled to the first pixel. The display further includes an active array having a second pixel. The display also includes a second emission power supply coupled to the second pixel.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: May 12, 2020
    Assignee: Apple Inc.
    Inventors: Sheng Zhang, Chengrui Le, Hopil Bae, Mahdi Farrokh Baroughi, David W. Lum, Adam Adjiwibawa, Chaohao Wang, Paolo Sacchetto, Wei H. Yao, Enkhamgalan Dorjgotov, Michael Slootsky, Giovanni Carbone, Derek K. Shaeffer, Henry C. Jen, Shingo Hatanaka, Hasan Akyol
  • Publication number: 20200066205
    Abstract: A method of adjusting a control signal to a component of an electronic display based on a temperature of the component, includes measuring current outputs of the component in response to applied gate voltages. The method also includes applying a mapping function to the current outputs to generate adapted current outputs, which are utilized to determine an intermediate value related to the temperature of the component. The intermediate value corresponds to a relationship between the applied gate voltages and the adapted current outputs. The intermediate value also enables the intermediate value to be substantially independent of hysteresis of the current outputs. The control signals to the component may be adjusted based at least in part on the determined intermediate value for the component.
    Type: Application
    Filed: April 4, 2018
    Publication date: February 27, 2020
    Inventors: Derek K. Shaeffer, Baris Cagdaser
  • Patent number: 10573211
    Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: February 25, 2020
    Assignee: Apple Inc.
    Inventors: Hung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B. Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-Il Chang, Shinya Ono, Jesse A. Richmond, Yafei Bi, Derek K. Shaeffer
  • Patent number: 10565923
    Abstract: Electronic devices and methods for compensating for noise in a display that includes sensing a current in a sensing channel of the display. Compensating for the noise also includes sensing an observation current from noise in an observation channel of the display and scaling the observation current to generate a scaled observation current. The scaled observation current is subtracted from the sense current to generate a compensated output. The compensated output is used to drive compensation operations of the display based at least in part on the compensated output to reduce effects of the noise.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: February 18, 2020
    Assignee: Apple Inc.
    Inventors: Shiping Shen, Derek K. Shaeffer, Baris Cagdaser, Hyunwoo Nho, Kingsuk Brahma, Hung Sheng Lin, Injae Hwang, Jie Won Ryu, Hyunsoo Kim, Junhua Tan, Rui Zhang, Shengkui Gao, Mohammad B Vahid Far, Jesse A. Richmond, Sun-Il Chang
  • Patent number: 10559238
    Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: February 11, 2020
    Assignee: Apple Inc.
    Inventors: Hung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-II Chang, Shinya Ono, Jesse A Richmond, Yafei Bi, Derek K. Shaeffer
  • Publication number: 20200033979
    Abstract: An integrated touchscreen can include light emitting diodes or organic light emitting diodes (LEDs/OLEDs), display chiplets and touch chiplets disposed in a visible area of the integrated touch screen. For example, the LEDs/OLEDs, display chiplets and touch chiplets can be placed on a substrate by a micro-transfer tool. The integrated touchscreen can also include electrodes disposed in the visible area of the integrated touch screen. The electrodes can be capable of providing display functionality via the one or more display chiplets during display operation (e.g., operating as cathode terminals of the LEDs during the display operation) and capable of providing touch functionality via the touch chiplets during touch operation (e.g., touch node electrodes can be formed from groups of the electrodes and sensed). In some examples, the touch node electrodes can be formed and coupled to touch chiplets via the display chiplets.
    Type: Application
    Filed: July 19, 2019
    Publication date: January 30, 2020
    Inventors: Christian M. SAUER, Christoph H. KRAH, Derek K. SHAEFFER, Hasan AKYOL, Henry C. JEN, Hopil BAE, John T. WETHERELL, Thierry S. DIVEL, Xiang LU
  • Publication number: 20190385509
    Abstract: Hybrid architectures and method methods of operating a display panel are described. In an embodiment, row driver and pixel driver functions are combined in a group of backbone hybrid pixel driver chips, wherein global signal lines are distributed to the backbone hybrid pixel driver chips, where the global signals are manipulated and distributed to a row of pixel driver chips.
    Type: Application
    Filed: March 18, 2019
    Publication date: December 19, 2019
    Inventors: Xiang Lu, Mahdi Farrokh Baroughi, Xiaofeng Wang, Derek K. Shaeffer, Henry C. Jen, Hopil Bae
  • Publication number: 20190347985
    Abstract: Local passive matrix displays and methods of operation are described. In an embodiment, the display includes a pixel driver chip coupled with a matrix of rows and columns of LEDs. The pixel driver chips may be arranged in rows across the display with separate portions to operate separate matrices of LEDs.
    Type: Application
    Filed: February 11, 2019
    Publication date: November 14, 2019
    Inventors: Derek K. Shaeffer, Mahdi Farrokh Baroughi, Xiaofeng Wang, Sam S. Li, John T. Wetherell, Henry C. Jen, Xiang Lu, Hasan Akyol, Hopil Bae, Xiang Fang, Hjalmar Edzer Ayco Huitema, Tore Nauta
  • Patent number: 10438535
    Abstract: A display device may include a plurality of pixels that display image data on a display, a digital-to-analog converter that outputs a voltage that corresponds to a luminance value to be depicted on a first pixel, and a circuit that amplifies the voltage and outputs an amplified voltage to the first pixel. The circuit may include a capacitor that receives the voltage via the digital-to-analog converter and an amplifier coupled to the capacitor. The amplifier generates the amplified voltage based on the voltage stored the capacitor. The circuit also include switches that couple a first terminal of the capacitor to an output of the amplifier during a first amount of time and couples a second terminal of the capacitor to the output of the amplifier after the first amount of time expires.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: October 8, 2019
    Assignee: Apple Inc.
    Inventors: Derek K. Shaeffer, Jesse A. Richmond, Kenichi Ueno, Kingsuk Brahma, Mohammad B. Vahid Far, Shingo Hatanaka, Yafei Bi
  • Publication number: 20190279552
    Abstract: A display device may include a plurality of pixels that may display image data on a display. The display device may also include a circuit that may receive pixel data including a gray level for at least one pixel of the plurality of pixels. The circuit may then receive an emission clock signal using a clock circuit based on the pixel data, such that the emission clock signal may cause the at least one pixel to receive a current for an amount of time based on the gray level. The circuit may then gate off the clock circuit after the amount of time.
    Type: Application
    Filed: September 20, 2017
    Publication date: September 12, 2019
    Inventors: Derek K. Shaeffer, Hopil Bae, Yafei Bi, Wei H. Yao, Xiaofeng Wang
  • Publication number: 20190244555
    Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), correlated-correlated double sampling (CDS-CDS) and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors that generate image data according to sensing operations. The one or more processors may reference a sensing pattern as part of sensing operations. Applying test sensing signals based on the sensing pattern may help reduce error associated with sensing operations.
    Type: Application
    Filed: April 19, 2019
    Publication date: August 8, 2019
    Inventors: Hung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B. Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-II Chang, Shinya Ono, Jesse Aaron Richmond, Yafei Bi, Derek K. Shaeffer, Myungjoon Choi, Shiping Shen
  • Publication number: 20190221146
    Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.
    Type: Application
    Filed: March 21, 2019
    Publication date: July 18, 2019
    Inventors: Hung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B. Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-II Chang, Shinya Ono, Jesse A. Richmond, Yafei Bi, Derek K. Shaeffer
  • Publication number: 20190088199
    Abstract: An electronic device includes a display having a reference array that includes a first pixel. The display also includes a first emission power supply coupled to the first pixel. The display further includes an active array having a second pixel. The display also includes a second emission power supply coupled to the second pixel.
    Type: Application
    Filed: September 14, 2018
    Publication date: March 21, 2019
    Inventors: Sheng Zhang, Chengrui Le, Hopil Bae, Mahdi Farrokh Baroughi, David W. Lum, Adam Adjiwibawa, Chaohao Wang, Paolo Sacchetto, Wei H. Yao, Enkhamgalan Dorjgotov, Michael Slootsky, Giovanni Carbone, Derek K. Shaeffer, Henry C. Jen, Shingo Hatanaka, Hasan Akyol