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    Displays with reduced color non-uniformity
    11.
    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
    13.
    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.

    Electronic display burn-in detection and mitigation
    14.
    发明授权
    Electronic display burn-in detection and mitigation 有权

    公开(公告)号：US11276369B2

    公开(公告)日：2022-03-15

    申请号：US15948796

    申请日：2018-04-09

    Applicant: Apple Inc.

    Inventor： Tobias Jung ,  Marc Albrecht ,  Paul S. Drzaic ,  Tae-Wook Koh ,  Teun R. Baar ,  Yifan Zhang ,  Ramin Samadani ,  Nicolas P. Bonnier

    IPC: G09G5/10 ,  G09G3/20

    Abstract: Systems, methods, and devices are provided to reduce a likelihood of image burn-in on an electronic display. Such an electronic device may include image processing circuitry and an electronic display. The image processing circuitry may receive image data and analyze the image data for risk of image burn-in and, based at least in part on the analysis of the image data, reduce a risk of image burn-in at least in part by reducing a local maximum pixel luminance value in at least one of a plurality of regions of the image data over time or by reducing a dynamic range headroom of the image data. The electronic display may display the image data with a reduced risk of image burn-in on the pixels of the electronic display.

    Display pixel overdrive systems and methods
    15.
    发明授权
    Display pixel overdrive systems and methods 有权

    公开(公告)号：US10460702B2

    公开(公告)日：2019-10-29

    申请号：US15691687

    申请日：2017-08-30

    Applicant: Apple Inc.

    Inventor： Nachum M. Kanovsky ,  Marc Albrecht ,  Tobias Jung ,  Xiaokai Li ,  Ameya Y. Joshi

    IPC: G09G5/10 ,  G09G5/393 ,  G09G3/36 ,  G09G3/20 ,  G09G5/395 ,  G09G5/36

    Abstract: Aspects of the subject technology relate to display circuitry including pixel overdrive circuitry. The pixel overdrive circuitry includes a compression engine that compresses a previous display frame, for storage and comparison to a current display frame without compression or decompression of the current display frame. The compression engine compresses the previous frame in such a way that the maximum compression error is always known and can be used to determine whether to perform overdrive operations for the current frame without compressing and decompressing the current display frame. The compression engine selects gradient encoding or decimation encoding for the compression of the previous display frame and can perform successive decimation operations within the gradient encoding operations to help reduce the size of the compressed previous frame while maintaining the quality of the ultimate overdriven current frame.

    Displays with Adjustable Direct-lit Backlight Units and Adaptive Processing
    17.
    发明申请
    Displays with Adjustable Direct-lit Backlight Units and Adaptive Processing 审中-公开

    公开(公告)号：US20200335047A1

    公开(公告)日：2020-10-22

    申请号：US16418748

    申请日：2019-05-21

    Applicant: Apple Inc.

    Inventor： Duane M. Petrovich ,  Sean C. Chang ,  Tobias Jung ,  Pierre-Yves Emelie ,  Marc Albrecht ,  Chen Zheng ,  Andrei E. Toma ,  Kevin W. Sliech ,  Mingxia Gu ,  Wei H. Yao

    IPC: G09G3/34 ,  G02F1/1335

    Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

    Displays with adjustable direct-lit backlight units and power consumption compensation
    18.
    发明授权
    Displays with adjustable direct-lit backlight units and power consumption compensation 有权

    公开(公告)号：US10571744B1

    公开(公告)日：2020-02-25

    申请号：US16388496

    申请日：2019-04-18

    Applicant: Apple Inc.

    Inventor： Sean C. Chang ,  Tobias Jung ,  Marc Albrecht ,  Abdeslam Hafidi ,  Jun Qi ,  Duane M. Petrovich ,  Mingxia Gu ,  Xiang Fang ,  Pierre-Yves Emelie ,  Wei H Yao

    IPC: G02F1/1335 ,  G09G3/36 ,  G09G3/34

    Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

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