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公开(公告)号：US10242649B2
公开(公告)日：2019-03-26
申请号：US15664940
申请日：2017-07-31
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli , Chaohao Wang , Guy Côté , Marc Albrecht
Abstract: Systems and methods for improving displayed image quality of an electronic display including a display pixel and a display driver are provided. A display pipeline receives input image data that indicates target luminance of the display pixel when displaying an image frame on the electronic display; determines a first bit group in pixel response corrected image data by mapping a first bit group in the input image data based at least in part on a first pixel response correction look-up-table; determines a second bit group in the pixel response corrected image data by mapping a second bit group in the input image data based at least in part on a second pixel response correction look-up-table; and outputs the pixel response corrected image data to the display driver to enable the display driver to facilitate displaying the image frame by writing the display pixel based on the pixel response corrected image data.
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公开(公告)号：US20180082626A1
公开(公告)日：2018-03-22
申请号：US15655591
申请日：2017-07-20
Applicant: APPLE INC.
Inventor： Marc Albrecht , Mahesh B. Chappalli , Christopher P. Tann , Jim C. Chou , Guy Cote
IPC: G09G3/20 , G09G3/36 , G09G3/3208
CPC classification number: G09G3/2055 , G09G3/2003 , G09G3/2051 , G09G3/2059 , G09G3/3208 , G09G3/3607 , G09G3/3614 , G09G2300/0452 , G09G2320/0242 , G09G2320/0257
Abstract: Devices and methods for error diffusion and spatiotemporal dithering are provided. By way of example, a method of operating a display includes receiving a pixel input, a set of pixel coordinates, and a current frame number. A kernel and a particular kernel bit of the kernel is selected from a set of kernels, based upon the pixel input, the pixel coordinates, the frame number, or any combination thereof. A dithered output is determined based at least in part upon the kernel bit. When the display is in a diamond pixel configuration, the dithered output is applied in accordance with a diamond pattern formed by red, blue, or red and blue pixel channels.
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公开(公告)号：US20240339086A1
公开(公告)日：2024-10-10
申请号：US18642765
申请日：2024-04-22
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli , Assaf Menachem , Daniel Yechiel Dar , Ido Yaacov Soffair
CPC classification number: G09G3/3426 , G09G3/36 , G09G2320/0233 , G09G2320/0247 , G09G2320/041 , G09G2320/043 , G09G2320/046 , G09G2320/0653 , G09G2330/021
Abstract: An electronic display device has a panel that operates in conjunction with a light-emitting diode (LED) backlight. The device “slopes” or gradually ramps a change in brightness of an LED based on a target brightness value of the LED, a current brightness value of the LED, and temperature at the LED. The device also may limit power to the backlight based on an estimated power consumption of a current row of LEDs of the backlight and power consumption of the other rows of LEDs. The device also may determine a reduced voltage to supply to an LED based on a current to supply to the LED to cause the LED to operate. The device also may send an interrupt to the backlight to block updates to the backlight while image content is written to pixels of the panel. The device further compensates for aging of and temperature at an LED.
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公开(公告)号：US20240331119A1
公开(公告)日：2024-10-03
申请号：US18742998
申请日：2024-06-13
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli , Alexey Kornienko
CPC classification number: G06T5/92 , G06T5/40 , G06T2207/20208
Abstract: Methods and systems include determining an upper boundary of brightness values of high-dynamic range image content. Using the determined upper boundary, end points of bins of histogram values are determined. Using the determined end points of the bins of histogram values, luma values are allocated to the bins. The high-dynamic range image content is processed based at least in part on the allocations to the bins. Image data including the processed high-dynamic range image content is displayed via an electronic display.
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公开(公告)号：US20240029687A1
公开(公告)日：2024-01-25
申请号：US18478588
申请日：2023-09-29
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli
CPC classification number: G09G5/10 , G09G3/2003 , G09G2320/0233 , G09G2310/0237
Abstract: A processor or other circuitry may obtain emissive element strength information for an array of emissive elements of an electronic display. The processor or other circuitry may reconstruct backlight information at multiple locations within the electronic display. The processor or other circuitry also compensates display of image data based at least in part on the reconstructed backlight information.
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Patent Agency Ranking
公开(公告)号：US11361476B2
公开(公告)日：2022-06-14
申请号：US17020705
申请日：2020-09-14
Applicant: Apple Inc.
Inventor： Vincent Z. Young , Can Jin , Mahesh B. Chappalli , Peter F. Holland , Nicolas Pierre Marie Frederic Bonnier
Abstract: An electronic device may include a display panel with pixels that present an image based on image data and an application processor that generates the image data. The electronic device may include a display pipeline coupled to the electronic display and the application processor. The display pipeline may receive first image data from the application processor corresponding to a first color space used by the application processor. The display pipeline may apply a color mapping relationship to the first image data to generate second image data. The color mapping relationship may define a transform to apply to the first image data to generate the second image data corresponding to a second color space used by the electronic display. The display pipeline may transmit the second image data to a display driver that operates the electronic display to emit light according to the second image data.
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公开(公告)号：US20220067891A1
公开(公告)日：2022-03-03
申请号：US17362923
申请日：2021-06-29
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli , Alexey Kornienko
Abstract: Methods and systems include determining an upper boundary of brightness values of high-dynamic range image content. Using the determined upper boundary, end points of bins of histogram values are determined. Using the determined end points of the bins of histogram values, luma values are allocated to the bins. The high-dynamic range image content is processed based at least in part on the allocations to the bins. Image data including the processed high-dynamic range image content is displayed via an electronic display.
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公开(公告)号：US20220066828A1
公开(公告)日：2022-03-03
申请号：US17149422
申请日：2021-01-14
Applicant: Apple Inc.
Inventor： Mahesh B. Chappalli
Abstract: Methods and systems include processors and hardware accelerators. The processor initiates a first process in a first hardware accelerator configured to aid the processor in performing the first process. The processor initiates the first process using one or more interface registers. The processor performs additional processing while the first hardware accelerator performs the first process after initiation of the first process. The processor also initiates a second process in a second hardware accelerator configured to aid the processor in performing a second process. Moreover, the processor initiates the second process using the one or more interface registers.
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49.发明授权公开(公告)号：US11233951B2
公开(公告)日：2022-01-25
申请号：US17119224
申请日：2020-12-11
Applicant: Apple Inc.
Inventor： Teun R. Baar , Nicolas P. Bonnier , Adria Fores Herranz , Mahesh B. Chappalli
Abstract: Aspects of the subject technology relate to display circuitry for displaying both standard dynamic range (SDR) and high dynamic range (HDR) content with an HDR display. The subject technology provides a headroom-based transfer function that maintains the contrast of the SDR content whether the display is operated in the SDR or HDR mode.
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公开(公告)号：US10978027B2
公开(公告)日：2021-04-13
申请号：US16828824
申请日：2020-03-24
Applicant: Apple Inc.
Inventor： Peter F. Holland , Mahesh B. Chappalli , Assaf Menachem
Abstract: An electronic device may include a display panel and an image data source designed to determine a differing region in the image frame by comparing source image data and image data corresponding with a previous image frame. The electronic device may also include a display pipeline between the image data source and the display panel. The display pipeline may include image processing circuitry to convert image data from a source space to a display space and image processing circuitry to spatially process the image data. The display pipeline may determine a crop region by converting the differing region to the display space and determine a partial frame region, based on the image data to be spatially processed, by the image processing circuitry. The display pipeline may also determine and retrieve a fetch region smaller than the image frame by converting the partial frame region to the source space.
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