Patents by Inventor Mahesh B. Chappalli

Mahesh B. Chappalli 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: 10789877
    Abstract: Devices and methods for underrun compensation are provided. By way of example, a technique for underrun compensation includes determining a particular one of a plurality of pixel configurations for a display. When an underrun condition is detected during processing of first image data via an image processing pipeline, at least a portion of requested image data for downstream processing has not yet been provided by an upstream processing component. Accordingly, upon detecting an underrun condition, underrun pixel data for the at least portion of the requested image data is generated, based upon the particular one of the plurality of pixel configurations.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: September 29, 2020
    Assignee: Apple Inc.
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Hari Ganesh R. Thirunageswaram
  • Publication number: 20200227010
    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.
    Type: Application
    Filed: March 24, 2020
    Publication date: July 16, 2020
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Assaf Menachem
  • Patent number: 10713748
    Abstract: Display pipeline may manage allocation of total memory bandwidth to memory access requester blocks (e.g., display pipeline as a whole and/or a block in the display pipeline) by dynamically allocating the total memory bandwidth based at least in part on a calculated bandwidth floor to reduce the communication inefficiency (e.g., underruns), excessive power consumption, and image quality degradation of the display pipeline. Image fetch parameters, electronic display parameters, display pipeline parameters, and memory access requester block parameters may be used to determine the appropriate bandwidth floor for each memory access requester of the display pipeline. Additional memory bandwidth may be allocated to memory access requesters of the display pipeline when available bandwidth remains to further reduce likelihood of subsequent communication inefficiencies in the display pipeline.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: July 14, 2020
    Assignee: Apple Inc.
    Inventors: Peter F. Holland, Mahesh B. Chappalli
  • Patent number: 10706817
    Abstract: An electronic device is provided. The electronic device includes a display that is configured to show content that includes a plurality of frames. The plurality of frames includes a first frame that is associated with a pre-transition value. The plurality of frames also includes a second frame that is associated with a current frame value that corresponds to a first luminance. Additionally, the electronic device is configured to determine an overdriven current frame value corresponding to a second luminance that is greater than the first luminance. The electronic device is also configured to display the second frame using the overdriven current frame value.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: July 7, 2020
    Assignee: Apple Inc.
    Inventors: Yingying Tang, Chaohao Wang, Sheng Zhang, Yunhui Hou, Paolo Sacchetto, Koorosh Aflatooni, Gokhan Avkarogullari, Guy Cote, Mahesh B. Chappalli, Peter F. Holland
  • Patent number: 10706825
    Abstract: Systems, apparatuses, and methods for implementing a timestamp based display update mechanism. A display control unit includes a timestamp queue for storing timestamps, wherein each timestamp indicates when a corresponding frame configuration set should be fetched from memory. At pre-defined intervals, the display control unit may compare the timestamp of the topmost entry of the timestamp queue to a global timer value. If the timestamp is earlier than the global timer value, the display control unit may pop the timestamp entry and fetch the frame next configuration set from memory. The display control unit may then apply the updates of the frame configuration set to its pixel processing elements. After applying the updates, the display control unit may fetch and process the source pixel data and then drive the pixels of the next frame to the display.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: July 7, 2020
    Assignee: Apple Inc.
    Inventors: Brijesh Tripathi, Arthur L. Spence, Joshua P. de Cesare, Ilie Garbacea, Guy Cote, Mahesh B. Chappalli, Malcolm D. Gray, Christopher P. Tann
  • Patent number: 10657874
    Abstract: An electronic device is provided. The electronic device includes a display that is configured to show content that includes a plurality of frames. The plurality of frames includes a first frame that is associated with a pre-transition value. The plurality of frames also includes a second frame that is associated with a current frame value that corresponds to a first luminance. Additionally, the electronic device is configured to determine an overdriven current frame value corresponding to a second luminance that is greater than the first luminance. The electronic device is also configured to display the second frame using the overdriven current frame value.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: May 19, 2020
    Assignee: Apple Inc.
    Inventors: Yingying Tang, Chaohao Wang, Sheng Zhang, Yunhui Hou, Paolo Sacchetto, Koorosh Aflatooni, Gokhan Avkarogullari, Guy Cote, Mahesh B. Chappalli, Peter F. Holland
  • Patent number: 10636392
    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.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: April 28, 2020
    Assignee: Apple Inc.
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Assaf Menachem
  • Patent number: 10593252
    Abstract: An electronic device may include an electronic display to display an image, based in part on display image data that indicates target luminance of the image using a first bit-depth, and a display pipeline. The display pipeline may include dither processing circuitry to determine a pixel cluster of multiple pixel groups of input image data that indicates target luminance using a second bit-depth greater than the first bit-depth. The dither processing circuitry may also determine a phase combination which associates a different dither phase to each of the pixel groups. The dither processing circuitry may also determine and apply a dither pattern and a dither phase to each pixel group to generate dithered image data corresponding with the display image data with the first bit-depth. The dither pattern may be based in part on the least significant bits of input image data of the pixel groups.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: March 17, 2020
    Assignee: Apple Inc.
    Inventor: Mahesh B. Chappalli
  • Publication number: 20200074583
    Abstract: Display pipeline may manage allocation of total memory bandwidth to memory access requester blocks (e.g., display pipeline as a whole and/or a block in the display pipeline) by dynamically allocating the total memory bandwidth based at least in part on a calculated bandwidth floor to reduce the communication inefficiency (e.g., underruns), excessive power consumption, and image quality degradation of the display pipeline. Image fetch parameters, electronic display parameters, display pipeline parameters, and memory access requester block parameters may be used to determine the appropriate bandwidth floor for each memory access requester of the display pipeline. Additional memory bandwidth may be allocated to memory access requesters of the display pipeline when available bandwidth remains to further reduce likelihood of subsequent communication inefficiencies in the display pipeline.
    Type: Application
    Filed: September 5, 2018
    Publication date: March 5, 2020
    Inventors: Peter F. Holland, Mahesh B. Chappalli
  • Patent number: 10504452
    Abstract: An electronic device may include a display pipeline to be coupled between an image data source and a display panel. The display pipeline may include pixel contrast control processing circuitry programmed to determine pixel statistics indicative of an image frame based at least in part on image data that indicates an initial target luminance of a corresponding display pixel implemented on the display panel. The pixel contrast control circuitry may also apply a set of local tone maps to determine modified image data that indicates a modified target luminance. The display pipeline may also include a pixel contrast control controller coupled to the pixel contrast control processing circuitry. The pixel contrast control controller may be programmed to execute firmware instructions to determine local tone maps to be applied during the next image frame based at least in part on the pixels statistics determined by the pixel contrast control processing circuitry.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: December 10, 2019
    Assignee: Apple Inc.
    Inventors: Mahesh B. Chappalli, Changki Min
  • Patent number: 10474408
    Abstract: Systems and methods for improving operation of an electronic device, which includes an image data processing pipeline that processes input image data. In the processing pipeline, a first processing block generates first processed image data by performing a first function on the input image data; another one or more processing blocks, which includes a second processing block coupled to a first output of the first processing block, generates second processed image data by performing a second function on the first processed image data when received from the first processing block; and a third processing block coupled to the first output and a second output of the other one or more processing blocks performs a third function on the first processed image data when received from the first processing block and performs the third function on the second processed image data when received from the other one or more processing blocks.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: November 12, 2019
    Assignee: Apple Inc.
    Inventors: Peter F. Holland, Mahesh B. Chappalli, David L. Bowman
  • Publication number: 20190340971
    Abstract: Devices and methods for underrun compensation are provided. By way of example, a technique for underrun compensation includes determining a particular one of a plurality of pixel configurations for a display. When an underrun condition is detected during processing of first image data via an image processing pipeline, at least a portion of requested image data for downstream processing has not yet been provided by an upstream processing component. Accordingly, upon detecting an underrun condition, underrun pixel data for the at least portion of the requested image data is generated, based upon the particular one of the plurality of pixel configurations.
    Type: Application
    Filed: July 18, 2019
    Publication date: November 7, 2019
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Hari Ganesh R. Thirunageswaram
  • Publication number: 20190341007
    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.
    Type: Application
    Filed: May 2, 2018
    Publication date: November 7, 2019
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Assaf Menachem
  • Publication number: 20190335081
    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.
    Type: Application
    Filed: July 19, 2018
    Publication date: October 31, 2019
    Inventors: Teun R. BAAR, Nicolas P. BONNIER, Adria FORES HERRANZ, Mahesh B. CHAPPALLI
  • Patent number: 10438564
    Abstract: An electronic display includes a display side and an ambient light sensor configured to measure received light received through the display side. The electronic display also includes multiple pixels located between the display side and the ambient light sensor. The multiple pixels are configured to emit display light through the display side.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: October 8, 2019
    Assignee: Apple Inc.
    Inventors: Guy Cote, Mahesh B. Chappalli, Venu M. Duggineni
  • Publication number: 20190279579
    Abstract: An electronic device may include a display pipeline to be coupled between an image data source and a display panel. The display pipeline may include pixel contrast control processing circuitry programmed to determine pixel statistics indicative of an image frame based at least in part on image data that indicates an initial target luminance of a corresponding display pixel implemented on the display panel. The pixel contrast control circuitry may also apply a set of local tone maps to determine modified image data that indicates a modified target luminance. The display pipeline may also include a pixel contrast control controller coupled to the pixel contrast control processing circuitry. The pixel contrast control controller may be programmed to execute firmware instructions to determine local tone maps to be applied during the next image frame based at least in part on the pixels statistics determined by the pixel contrast control processing circuitry.
    Type: Application
    Filed: March 12, 2018
    Publication date: September 12, 2019
    Inventors: Mahesh B. Chappalli, Changki Min
  • Patent number: 10410575
    Abstract: Devices and methods for underrun compensation are provided. By way of example, a technique for underrun compensation includes determining a particular one of a plurality of pixel configurations for a display. When an underrun condition is detected during processing of first image data via an image processing pipeline, at least a portion of requested image data for downstream processing has not yet been provided by an upstream processing component. Accordingly, upon detecting an underrun condition, underrun pixel data for the at least portion of the requested image data is generated, based upon the particular one of the plurality of pixel configurations.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: September 10, 2019
    Assignee: Apple Inc.
    Inventors: Peter F. Holland, Mahesh B. Chappalli, Hari Ganesh R. Thirunageswaram
  • Patent number: 10403192
    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.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: September 3, 2019
    Assignee: Apple Inc.
    Inventors: Marc Albrecht, Mahesh B. Chappalli, Christopher P. Tann, Jim C. Chou, Guy Cote
  • Publication number: 20190122636
    Abstract: An electronic device is provided. The electronic device includes a display that is configured to show content that includes a plurality of frames. The plurality of frames includes a first frame that is associated with a pre-transition value. The plurality of frames also includes a second frame that is associated with a current frame value that corresponds to a first luminance. Additionally, the electronic device is configured to determine an overdriven current frame value corresponding to a second luminance that is greater than the first luminance. The electronic device is also configured to display the second frame using the overdriven current frame value.
    Type: Application
    Filed: September 28, 2018
    Publication date: April 25, 2019
    Inventors: Yingying Tang, Chaohao Wang, Sheng Zhang, Yunhui Hou, Paolo Sacchetto, Koorosh Aflatooni, Gokhan Avkarogullari, Guy Cote, Mahesh B. Chappalli, Peter F. Holland
  • Patent number: 10262605
    Abstract: Systems, methods, and non-transitory media are presented that provide for improving color accuracy. An electronic display includes a display region having multiple pixels each having multiple subpixels. The electronic device also includes a display pipeline coupled to the electronic display. The display pipeline is configured to receive image data and perform white point compensation on the image data to compensate for a current drop in the display to cause the display to display a target white point when displaying white. The display pipeline also is configured to correct white point overcompensation on the image data to reduce possible oversaturation of non-white pixels using the white point compensation. Finally, the display pipeline is configured to output the compensated and corrected image data to the electronic display to facilitate displaying the compensated and corrected image data on the display region.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: April 16, 2019
    Assignee: APPLE INC.
    Inventors: Adria Fores Herranz, Guy Côté, Arthur L. Spence, Mahesh B. Chappalli, Peter F. Holland, Ross Thompson