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    Step-down pixel response correction systems and methods
    32.
    发明授权
    Step-down pixel response correction systems and methods 有权

    公开(公告)号：US10535287B2

    公开(公告)日：2020-01-14

    申请号：US15275374

    申请日：2016-09-24

    Applicant: Apple Inc.

    Inventor： Chaohao Wang ,  Lu Zhang ,  Zhibing Ge ,  Shih-Chyuan Fan Jiang ,  Ilie Garbacea ,  Marc Albrecht ,  Kingsuk Brahma ,  Hopil Bae ,  Paolo Sacchetto ,  Jie Won Ryu ,  Sandro H. Pintz ,  Chengrui Le

    IPC: G09G3/34 ,  G09G3/3258 ,  G09G3/36 ,  G09G3/20

    Abstract: Systems and methods are provided for improving displayed image quality of an electronic display that includes a display pixel. The electronic display displays a first image frame directly after a second image frame by applying an analog electrical signal to the display pixel. To facilitate display of the first image frame, circuitry receives image data corresponding to the image frame, in which the image data includes a grayscale value that indicates target luminance of the display pixel; determines expected refresh rate of the first image frame based at least in part on actual refresh rate of the second image frame; determines a pixel response correction offset based at least in part on the expected refresh rate of the first image frame; and determines processed image data by applying the pixel response correction offset to the grayscale value, in which the processed image data indicates magnitude of the analog electrical signal.

    Display flicker reduction systems and methods
    33.
    发明授权
    Display flicker reduction systems and methods 有权

    公开(公告)号：US10424244B2

    公开(公告)日：2019-09-24

    申请号：US15404139

    申请日：2017-01-11

    Applicant: Apple Inc.

    Inventor： Chengrui Le ,  Chaohao Wang ,  Kingsuk Brahma ,  Jie Won Ryu ,  Chin-Wei Lin ,  Rui Zhang

    IPC: G09G3/3233

    Abstract: Aspects of the subject technology relate to electronic devices with displays. A display may include an array of display pixels each having a drive transistor and an organic light-emitting diode. A pulse-width-modulated current may be provided to the organic light-emitting diode during each display frame to compensate for an on-bias compensation applied to the drive transistor between display frames. The pulse-width-modulated current may be provided with a pulse-width-modulation ratio that decreases over the course of each display frame. The decrease of the pulse-width-modulation ratio for each display frame may be determined based on a peak luminance for that display frame. The reduction in flicker provided by the pulse-width-modulated current may facilitate operation of the display with a reduced refresh rate, thereby reducing power consumption by the display.

    Power cycle display sensing
    34.
    发明授权
    Power cycle display sensing 有权

    公开(公告)号：US10388201B2

    公开(公告)日：2019-08-20

    申请号：US15697132

    申请日：2017-09-06

    Applicant: Apple Inc.

    Inventor： Sun-Il Chang ,  Hyunwoo Nho ,  Hung Sheng Lin ,  Junhua Tan ,  Jie Won Ryu ,  Kingsuk Brahma ,  Jesse A. Richmond ,  Mohammad B. Vahid Far ,  Yafei Bi

    IPC: G09G3/00 ,  G09G3/20 ,  G09G5/00

    Abstract: Electronic devices and methods pertain to reducing artifacts resulting from a thermal profile preexisting a boot up of an electronic device are disclosed. Scanning driving circuitry of the electronic device scans at least a portion of one or more pixels of an active area of a display using a boot up scan before a boot up sequence of at least a portion of an electronic device completes. The results of the boot up scan are stored in local buffers and transferred to one or more processors upon connection to the one or more processors. The results of the boot up scan cause the one or more processors to modify image data to reduce or eliminate artifacts that may result during boot up due to thermal profiles or other parameters that may cause artifacts.

    NOISE MITIGATION FOR DISPLAY PANEL SENSING
    35.
    发明申请
    NOISE MITIGATION FOR DISPLAY PANEL SENSING 审中-公开

    公开(公告)号：US20190221146A1

    公开(公告)日：2019-07-18

    申请号：US16361018

    申请日：2019-03-21

    Applicant: Apple Inc.

    Inventor： 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

    IPC: G09G3/00

    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.

    SYSTEMS AND METHODS FOR DRIVING AN ELECTRONIC DISPLAY USING A RAMP DAC
    36.
    发明申请
    SYSTEMS AND METHODS FOR DRIVING AN ELECTRONIC DISPLAY USING A RAMP DAC 审中-公开

    公开(公告)号：US20180337687A1

    公开(公告)日：2018-11-22

    申请号：US15600356

    申请日：2017-05-19

    Applicant: Apple Inc.

    Inventor： Adam Adjiwibawa ,  David W. Lum ,  Wonjae Choi ,  Hynwoo Nho ,  Hopil Bae ,  Injae Hwang ,  Bryce T. Bradford ,  Jie Won Ryu ,  Hung Sheng Lin

    IPC: H03M1/66 ,  H03M1/80 ,  G09G3/20

    Abstract: A display device may include rows of pixels that displays image data on a display, data lines coupled to the rows of pixels, and a digital-to-analog converter (DAC) that outputs a ramp voltage signal including a data voltage to be depicted on a first pixel of the rows of pixels. The display device may also include a capacitor that receives the ramp voltage signal via the DAC and a circuit that sends a control signal to a circuit component that causes the DAC to couple to the capacitor via one of the data lines for a duration of time that comprises a first time when the ramp voltage signal is below the data voltage and a second time when the ramp voltage signal is approximately equal to the data voltage. The capacitor is coupled to the DAC when the ramp voltage signal is greater than zero.

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