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    Display flicker reduction systems and methods
    11.
    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.

    Displays with reduced color non-uniformity
    14.
    发明授权
    Displays with reduced color non-uniformity 有权

    公开(公告)号：US11804187B2

    公开(公告)日：2023-10-31

    申请号：US17848929

    申请日：2022-06-24

    Applicant: Apple Inc.

    Inventor： Fang-Cheng Lin ,  Chengrui Le ,  Yi-Pai Huang ,  Suraj P Gorkhali ,  Tobias Jung ,  He Li ,  Yansong Liu

    IPC: G09G3/34 ,  G09G3/36

    CPC classification number: G09G3/3413 ,  G09G3/3426 ,  G09G3/36 ,  G09G2320/0233 ,  G09G2320/0242 ,  G09G2320/0693 ,  G09G2360/16

    Abstract: An electronic device may include a display having an array of pixels and a backlight that provides backlight illumination for the array of pixels. The backlight may be a direct-lit backlight with a two-dimensional array of light-emitting diodes operable in a local dimming scheme. The electronic device may include control circuitry that provides pixel signals to the array of pixels and backlight signals to the backlight. The control circuitry may adjust the pixel signals and the backlight signals to compensate for brightness and color non-uniformity in the backlight. To compensate for image-dependent backlight non-uniformity, the control circuitry may simulate artificial backlight data based on the target image to be displayed and stored point spread information. To compensate for white-point-dependent backlight non-uniformity, the control circuitry may use measured actual backlight data that describes color variations across the backlight for a given target white point.

    Displays with Reduced Color Non-Uniformity
    15.
    发明申请
    Displays with Reduced Color Non-Uniformity 有权

    公开(公告)号：US20220415271A1

    公开(公告)日：2022-12-29

    申请号：US17848929

    申请日：2022-06-24

    Applicant: Apple Inc.

    Inventor： Fang-Cheng Lin ,  Chengrui Le ,  Yi-Pai Huang ,  Suraj P Gorkhali ,  Tobias Jung ,  He Li ,  Yansong Liu

    IPC: G09G3/34 ,  G02F1/13357 ,  G02F1/1335

    Abstract: An electronic device may include a display having an array of pixels and a backlight that provides backlight illumination for the array of pixels. The backlight may be a direct-lit backlight with a two-dimensional array of light-emitting diodes operable in a local dimming scheme. The electronic device may include control circuitry that provides pixel signals to the array of pixels and backlight signals to the backlight. The control circuitry may adjust the pixel signals and the backlight signals to compensate for brightness and color non-uniformity in the backlight. To compensate for image-dependent backlight non-uniformity, the control circuitry may simulate artificial backlight data based on the target image to be displayed and stored point spread information. To compensate for white-point-dependent backlight non-uniformity, the control circuitry may use measured actual backlight data that describes color variations across the backlight for a given target white point.

    PREEMPTIVE REFRESH FOR REDUCED DISPLAY JUDDER
    16.
    发明申请
    PREEMPTIVE REFRESH FOR REDUCED DISPLAY JUDDER 有权

    公开(公告)号：US20220327977A1

    公开(公告)日：2022-10-13

    申请号：US17680103

    申请日：2022-02-24

    Applicant: Apple Inc.

    Inventor： Kevin W. Sliech ,  Jason N. Gomez ,  David A. Hartley ,  Chengrui Le ,  Paolo Sacchetto ,  Arthur L. Spence

    IPC: G09G3/20

    Abstract: 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.

    TECHNIQUES TO COMPENSATE FOR FLICKER AT LOW REFRESH RATES
    17.
    发明申请
    TECHNIQUES TO COMPENSATE FOR FLICKER AT LOW REFRESH RATES 有权

    公开(公告)号：US20210350752A1

    公开(公告)日：2021-11-11

    申请号：US17223903

    申请日：2021-04-06

    Applicant: Apple Inc.

    Inventor： Zhibing Ge ,  Chengrui Le ,  Yuechen Wu ,  Xiaokai Li ,  Lingyu Hong ,  Chaohao Wang ,  Shih-Chyuan Fan Jiang

    IPC: G09G3/34 ,  G09G3/36

    Abstract: Certain embodiments are directed to techniques (e.g., a method, an apparatus, and non-transitory computer readable medium storing code or instructions executable by one or more processors) for mitigating the flicker on the displays at low driving frequencies due to drops of the voltage holding ratio of the materials for the display. The techniques to compensate for flicker in a liquid crystal display can include generating a dynamic waveform for the backlight of the display. The dynamic waveform can be synchronized with the driving rate of the liquid crystal display such that the luminosity of the backlight increases during periods when the voltage-holding ratio drops in the materials of the display. In this way, a liquid crystal material can be utilized in a display to generate reduced power consumption with liquid crystal rate minimizing the flicker in response to the drops of the voltage-holding ratio.

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