Patents by Inventor David S. Zalatimo
David S. Zalatimo 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).
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Publication number: 20240135856Abstract: An electronic device may include an electronic display having multiple display pixels that display an image based on dithered image data. The electronic device may also include image processing circuitry that generates the dithered image data based on input image data and a threshold gray level that is greater than one. Generating the dithered image data may include replacing each gray level of the input image data that is less than the threshold gray level with either a zero gray level or the threshold gray level according to a dither pattern.Type: ApplicationFiled: August 8, 2023Publication date: April 25, 2024Inventors: Jongyup Lim, David S Zalatimo, Hyunwoo Nho, Jie Won Ryu, Koorosh Aflatooni, Myungjoon Choi, Wei Xiong
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Patent number: 11810494Abstract: An electronic device may include an electronic display having multiple display pixels to display an image based on analog voltage signals. The electronic device may also include optical calibration circuitry to generate digital-to-analog converter (DAC) data based on image data associated with the image and dither circuitry to reduce a bit-depth of the DAC data, generating dithered DAC data. Additionally, the electronic device may include a gamma generator having one or more DACs to generate the analog voltage signals based on the dithered DAC data, which may instruct the gamma generator to generate the analog voltage signals indicative of the image data.Type: GrantFiled: August 16, 2022Date of Patent: November 7, 2023Assignee: Apple Inc.Inventors: Jie Won Ryu, ByoungSuk Kim, David S Zalatimo, Graeme M Williams, Hyunsoo Kim, Hyunwoo Nho, Jesse R Manders, Kingsuk Brahma, Li-Xuan Chuo, Sachiko Oda, Shatam Agarwal, Yao Shi
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Publication number: 20230087480Abstract: An electronic device may include an electronic display having multiple display pixels to display an image based on analog voltage signals. The electronic device may also include optical calibration circuitry to generate digital-to-analog converter (DAC) data based on image data associated with the image and dither circuitry to reduce a bit-depth of the DAC data, generating dithered DAC data. Additionally, the electronic device may include a gamma generator having one or more DACs to generate the analog voltage signals based on the dithered DAC data, which may instruct the gamma generator to generate the analog voltage signals indicative of the image data.Type: ApplicationFiled: August 16, 2022Publication date: March 23, 2023Inventors: Jie Won Ryu, ByoungSuk Kim, David S. Zalatimo, Graeme M. Williams, Hyunsoo Kim, Hyunwoo Nho, Jesse R. Manders, Kingsuk Brahma, Li-Xuan Chuo, Sachiko Oda, Shatam Agarwal, Yao Shi
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Patent number: 11099804Abstract: Aspects of the subject technology relate to electronic device display circuitry and methods of operating the display. The display circuitry a panel driver interface that decodes digital display data, for each display frame, received from host circuitry of the electronic device. The digital display data includes error correction and detection information for frame and line configuration information distributed in a frame packet and multiple line packets for each display frame. The frame and line configuration information facilitates, efficient, low-error, digital control of various display operational features.Type: GrantFiled: August 1, 2019Date of Patent: August 24, 2021Assignee: Apple Inc.Inventors: Fenghua Zheng, David S. Zalatimo, James E. Brown, Sachiko Oda, Johan L. Piper
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Patent number: 11024243Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: GrantFiled: September 28, 2020Date of Patent: June 1, 2021Assignee: Apple Inc.Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz
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Publication number: 20210012733Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: ApplicationFiled: September 28, 2020Publication date: January 14, 2021Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz
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Patent number: 10789902Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: GrantFiled: August 27, 2018Date of Patent: September 29, 2020Assignee: Apple Inc.Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz
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Patent number: 10762856Abstract: Aspects of the subject technology relate to electronic devices with displays. A display may include an array of display pixels and control circuitry for operating the display. The control circuitry may determine, based on pixel values for a row of display pixels, that a current in common supply voltage circuitry for the display pixels will exceed a threshold, if the row of display pixels is operated using the pixel values. The control circuitry may modify the pixel values for the row of display pixels to reduce the current in the common supply voltage circuitry and/or prevent the current in the common supply voltage circuitry from exceeding the threshold.Type: GrantFiled: February 9, 2018Date of Patent: September 1, 2020Assignee: Apple Inc.Inventors: Manev Luthra, Joseph P. Manca, Fenghua Zheng, David S. Zalatimo
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Patent number: 10665181Abstract: An electronic device may be provided with a display. The display may include a backlight having an array of locally dimmable light sources. Control circuitry may provide control signals to the backlight to produce light at different brightness levels. When the brightness level is below a threshold, the control circuitry may use pulse-width-modulation control signals to control the light sources in the backlight. When the brightness level is above the brightness threshold, the control circuitry may use analog control signals to control the light sources in the backlight. The control circuitry may adjust the threshold to achieve different dimming ranges for different brightness settings. A low brightness setting, for example, may have a lower threshold and lower dimming range than a high brightness setting, which may help produce darker darks when the display operates in a low brightness setting.Type: GrantFiled: February 27, 2018Date of Patent: May 26, 2020Assignee: Apple Inc.Inventors: Marc Albrecht, Teun R. Baar, Nicolas P. Bonnier, Sean Chang, ByoungSuk Kim, David S. Zalatimo
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Patent number: 10643555Abstract: Devices and methods for useful in providing localized synchronized and/or dynamic in-band internal gamma code adjustment per frame period are provided. By way of example, a display panel includes a data driver, which includes a first DAC configured to provide an internal gamma voltage signal to cause a first adjustment to an image data signal. The first adjustment is configured to selectively adjust the image data signal based at least in part on a refresh rate or a frame rate of the display panel. The data driver includes a second DAC coupled to the first DAC and configured to provide an external gamma voltage signal configured to provide a second adjustment to the image data signal, and an output buffer configured to supply the image data signal to pixels of the display panel, wherein the image data signal comprises the first adjustment and the second adjustment.Type: GrantFiled: September 7, 2017Date of Patent: May 5, 2020Assignee: Apple Inc.Inventors: Fenghua Zheng, Christopher P. Tann, Sandro H. Pintz, David S. Zalatimo, Jun Qi, Zhibing Ge
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Patent number: 10643549Abstract: 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.Type: GrantFiled: November 5, 2019Date of Patent: May 5, 2020Assignee: Apple Inc.Inventors: Tobias Jung, Marc Albrecht, Duane M. Petrovich, Sean C. Chang, David S. Zalatimo, Pierre-Yves Emelie, Manev Luthra, Chengrui Le, Lingyu Hong, Wei H. Yao
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Publication number: 20200042264Abstract: Aspects of the subject technology relate to electronic device display circuitry and methods of operating the display. The display circuitry a panel driver interface that decodes digital display data, for each display frame, received from host circuitry of the electronic device. The digital display data includes error correction and detection information for frame and line configuration information distributed in a frame packet and multiple line packets for each display frame. The frame and line configuration information facilitates, efficient, low-error, digital control of various display operational features.Type: ApplicationFiled: August 1, 2019Publication date: February 6, 2020Inventors: Fenghua Zheng, David S. Zalatimo, James E. Brown, Sachiko Oda, Johan L. Piper
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Patent number: 10504453Abstract: 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.Type: GrantFiled: April 18, 2019Date of Patent: December 10, 2019Assignee: Apple Inc.Inventors: Tobias Jung, Marc Albrecht, Duane M. Petrovich, Sean C. Chang, David S. Zalatimo, Pierre-Yves Emelie, Manev Luthra, Chengrui Le, Lingyu Hong, Wei H. Yao
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Patent number: 10482806Abstract: Devices and methods for reducing or eliminating spatiotemporal dithering image artifacts are provided. By way of example, a method includes providing positive polarity and negative polarity data signals to a plurality of pixels of a display during a first frame period, in which the first frame period corresponds a first spatiotemporal rotation phase. The method includes providing the positive polarity signals and the negative polarity signals to the plurality of pixels of the display during a second frame period, in which the second frame period corresponds a second spatiotemporal rotation phase. A spatiotemporal rotation phase sequence provided to the display comprises the first spatiotemporal rotation phase and the second spatiotemporal rotation phase. One of the first spatiotemporal rotation phase and the second spatiotemporal rotation phase of the spatiotemporal rotation phase sequence is altered during the first frame period or the second time period.Type: GrantFiled: March 2, 2015Date of Patent: November 19, 2019Assignee: Apple Inc.Inventors: Marc Albrecht, David S. Zalatimo, Christopher P. Tann, Sandro H. Pintz
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Publication number: 20190005897Abstract: Aspects of the subject technology relate to electronic devices with displays. A display may include an array of display pixels and control circuitry for operating the display. The control circuitry may determine, based on pixel values for a row of display pixels, that a current in common supply voltage circuitry for the display pixels will exceed a threshold, if the row of display pixels is operated using the pixel values. The control circuitry may modify the pixel values for the row of display pixels to reduce the current in the common supply voltage circuitry and/or prevent the current in the common supply voltage circuitry from exceeding the threshold.Type: ApplicationFiled: February 9, 2018Publication date: January 3, 2019Inventors: Manev LUTHRA, Joseph P. MANCA, Fenghua ZHENG, David S. ZALATIMO
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Publication number: 20190005898Abstract: An electronic device may be provided with a display. The display may include a backlight having an array of locally dimmable light sources. Control circuitry may provide control signals to the backlight to produce light at different brightness levels. When the brightness level is below a threshold, the control circuitry may use pulse-width-modulation control signals to control the light sources in the backlight. When the brightness level is above the brightness threshold, the control circuitry may use analog control signals to control the light sources in the backlight. The control circuitry may adjust the threshold to achieve different dimming ranges for different brightness settings. A low brightness setting, for example, may have a lower threshold and lower dimming range than a high brightness setting, which may help produce darker darks when the display operates in a low brightness setting.Type: ApplicationFiled: February 27, 2018Publication date: January 3, 2019Inventors: Marc Albrecht, Teun R. Baar, Nicolas P. Bonnier, Sean Chang, ByoungSuk Kim, David S. Zalatimo
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Patent number: 10163385Abstract: A display may have an array of pixels controlled by display driver circuitry. Gate driver circuitry supplies gate line signals to rows of the pixels. The gate driver circuitry may include gate driver integrated circuits. Each gate driver integrated circuit may have a shift register that supplies the gate line signals to the rows of pixels. The display driver circuitry supplies a clock signal to the gate driver integrated circuits. Each gate driver integrated circuit may have one or more clock trees that are selectively enable and disabled. Each gate driver integrated circuit may have a controller and a buffer that is controlled by a control signal from the controller. The buffer may be adjusted to supply or to not supply the clock signal to an associated clock tree in that gate driver integrated circuit.Type: GrantFiled: September 16, 2015Date of Patent: December 25, 2018Assignee: Apple Inc.Inventors: Fenghua Zheng, Christopher P. Tann, David S. Zalatimo, James E. C. Brown, Sandro H. Pintz
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Publication number: 20180366078Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: ApplicationFiled: August 27, 2018Publication date: December 20, 2018Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz
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Patent number: 10102815Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: GrantFiled: February 7, 2018Date of Patent: October 16, 2018Assignee: Apple Inc.Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz
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Publication number: 20180166032Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.Type: ApplicationFiled: February 7, 2018Publication date: June 14, 2018Inventors: Chaohao Wang, Brijesh Tripathi, Christopher Philip Alan Tann, David S. Zalatimo, Guy Cote, Hao Nan, Marc Albrecht, Paolo Sacchetto, Sandro H. Pintz