Patents by Inventor Mohammad Hajirostam
Mohammad Hajirostam 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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Patent number: 11302264Abstract: A display device may include rows of pixels that display image data on a display and a circuit. The circuit may receive pixel data value of image data for a pixel in a first row of the rows of pixels, determine a weight factor to apply to the pixel data value based on a position of the first row with respect to the other rows, such that each row is associated with a current-resistance (IR) drop across the display. The weight factor is determined based on a respective IR drop associated with the first row. The circuit may also generate a weighted pixel data value based on the weight factor and the pixel data value and send the weighted pixel data value to a display driver circuit that renders the image data via the display.Type: GrantFiled: July 12, 2019Date of Patent: April 12, 2022Assignee: Apple Inc.Inventors: Shengkui Gao, Marc Joseph DeVincentis, Yue Jack Chu, Sinan Alousi, Mohammad Hajirostam, Mohammad Ali Jangda, Koorosh Aflatooni, Pierre-Yves Emelie, Yafei Bi, Paolo Sacchetto, Kasra Omid-Zohoor
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Patent number: 11087670Abstract: An electronic device may have a flexible display such as an organic light-emitting diode display. A strain sensing resistor may be formed on a bent tail portion of the flexible display to gather strain measurements. Resistance measurement circuitry in a display driver integrated circuit may make resistance measurements on the strain sensing resistor and a temperature compensation resistor to measure strain. A crack detection line may be formed from an elongated pair of traces that are coupled at their ends to form a loop. The crack detection line may run along a peripheral edge of the flexible display. Crack detection circuitry may monitor the resistance of the crack detection line to detect cracks. The crack detection circuitry may include switches that adjust the length of the crack detection line and thereby allow resistances to be measured for different segments of the line.Type: GrantFiled: February 13, 2018Date of Patent: August 10, 2021Assignee: Apple Inc.Inventors: Prashant Mandlik, Bhadrinarayana Lalgudi Visweswaran, Izhar Z Ahmed, Zhen Zhang, Tsung-Ting Tsai, Ki Yeol Byun, Yu Cheng Chen, Sungki Lee, Mohammad Hajirostam, Sinan Alousi
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Patent number: 10916182Abstract: Systems and methods for improving perceived image quality of an electronic display communicatively coupled to an image data source that outputs a synchronization control signal, which indicates when an image frame is expected to stop being written, based on a source clock signal. The electronic display includes a display pixel row, a display driver, and a timing controller. The timing controller determines a target scan time to be used to write the image frame to the display pixel row and instructs the display driver to write the image frame to the display pixel row based on the target scan time and a display block signal, in which the timing controller instructs the display driver to continue writing the image frame to display pixel row after the electronic display receives the synchronization control signal when the synchronization control signal is received before the target scan time is reached.Type: GrantFiled: September 21, 2017Date of Patent: February 9, 2021Assignee: Apple Inc.Inventors: Sinan Alousi, Haifeng Li, Mohammad Hajirostam, Yafei Bi
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Patent number: 10672320Abstract: A display device may include a processor that may receive image data, such that the image data may include gray level data and display brightness value (DBV) data for a first pixel of a display. The processor may then determine a gain compensation factor associated with the first pixel based on a correction spatial map, a brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may then determine an offset compensation factor associated with the first pixel based on the correction spatial map, the brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may generate compensated gray level data by applying the gain compensation factor and the offset compensation factor to the gray level data and transmit the compensated gray level data to pixel driving circuitry associated with the first pixel.Type: GrantFiled: September 14, 2018Date of Patent: June 2, 2020Assignee: Apple Inc.Inventors: Hung Sheng Lin, Soojin Park, Bhadrinarayana L. Visweswaran, Chieh-Wei Chen, Anshi Liang, Marc Albrecht, Pierre-Yves Emelie, Sean C. Chang, Hyunwoo Nho, Mohammad Hajirostam, Myung-Je Cho, Shengkui Gao, Wei H. Yao, Yafei Bi
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Publication number: 20200143750Abstract: A display device may include rows of pixels that display image data on a display and a circuit. The circuit may receive pixel data value of image data for a pixel in a first row of the rows of pixels, determine a weight factor to apply to the pixel data value based on a position of the first row with respect to the other rows, such that each row is associated with a current-resistance (IR) drop across the display. The weight factor is determined based on a respective IR drop associated with the first row. The circuit may also generate a weighted pixel data value based on the weight factor and the pixel data value and send the weighted pixel data value to a display driver circuit that renders the image data via the display.Type: ApplicationFiled: July 12, 2019Publication date: May 7, 2020Inventors: Shengkui Gao, Marc Joseph DeVincentis, Yue Jack Chu, Sinan Alousi, Mohammad Hajirostam, Mohammad Ali Jangda, Koorosh Aflatooni, Pierre-Yves Emelie, Yafei Bi, Paolo Sacchetto, Kasra Omid-Zohoor
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Patent number: 10643511Abstract: An electronic device may have a flexible display such as an organic light-emitting diode display. A strain sensing resistor may be formed on a bent tail portion of the flexible display to gather strain measurements. Resistance measurement circuitry in a display driver integrated circuit may make resistance measurements on the strain sensing resistor and a temperature compensation resistor to measure strain. A crack detection line may be formed from an elongated pair of traces that are coupled at their ends to form a loop. The crack detection line may run along a peripheral edge of the flexible display. Crack detection circuitry may monitor the resistance of the crack detection line to detect cracks. The crack detection circuitry may include switches that adjust the length of the crack detection line and thereby allow resistances to be measured for different segments of the line.Type: GrantFiled: September 23, 2016Date of Patent: May 5, 2020Assignee: Apple Inc.Inventors: Rui Zhang, Mohammad Hajirostam, Hung Sheng Lin, Mohammad B. Vahid Far, Sang Y. Youn, Zhen Zhang, Prashant Mandlik, Sun-Il Chang, Jie Won Ryu, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Yafei Bi, Yun Wang
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Patent number: 10636355Abstract: An electronic device includes processors that generate image data. The electronic device also includes an electronic display that displays the image data over a first frame duration by programming a first row of display pixels with the image data. The electronic display also displays the image data over the first frame duration by causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data. The electronic display further displays the image data over the first frame duration by resetting the first row of pixels at least two times before an end of the first frame duration.Type: GrantFiled: April 27, 2018Date of Patent: April 28, 2020Assignee: Apple Inc.Inventors: Hung Sheng Lin, Mohammad Ali Jangda, Injae Hwang, Rui Zhang, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Mohammad Hajirostam
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Patent number: 10529053Abstract: A display device may include a display having a pixels and a processor. The processor may receive image data, determine a digital offset value for a pixel based on a location of the pixel, such that the digital offset value compensates for one or more non-uniformity properties of the pixel. The processor may determine a scale factor associated with the pixel based on at least two of a luminance setting for the display, a driving mode of the display, and a gray level value for the pixel. The processor may then generate correction image data by applying the scale factor to the digital offset value, generate compensated image data based on the correction image data and the image data, and provide the compensated image data to the display.Type: GrantFiled: September 21, 2017Date of Patent: January 7, 2020Assignee: Apple Inc.Inventors: Shengkui Gao, Hung Sheng Lin, Hyunsoo Kim, Hyunwoo Nho, Katherine W. Song, Mohammad Hajirostam, Myung-Je Cho, Rui Zhang, Sang Y. Youn, Wei H. Yao, Yafei Bi
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Patent number: 10417971Abstract: An electronic device includes processors that generate image data. The electronic device also includes an electronic display that displays the image data over a first frame duration by programming a first row of display pixels with the image data. The electronic display also displays the image data over the first frame duration by causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data. The electronic display further displays the image data over the first frame duration by resetting the first row of pixels before an end of the first frame duration.Type: GrantFiled: July 31, 2017Date of Patent: September 17, 2019Assignee: Apple Inc.Inventors: Hung Sheng Lin, Mohammad Ali Jangda, Injae Hwang, Rui Zhang, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Mohammad Hajirostam
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Publication number: 20190237001Abstract: A display device may include a processor that may receive image data, such that the image data may include gray level data and display brightness value (DBV) data for a first pixel of a display. The processor may then determine a gain compensation factor associated with the first pixel based on a correction spatial map, a brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may then determine an offset compensation factor associated with the first pixel based on the correction spatial map, the brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may generate compensated gray level data by applying the gain compensation factor and the offset compensation factor to the gray level data and transmit the compensated gray level data to pixel driving circuitry associated with the first pixel.Type: ApplicationFiled: September 14, 2018Publication date: August 1, 2019Inventors: Hung Sheng Lin, Soojin Park, Bhadrinarayana L. Visweswaran, Chieh-Wei Chen, Anshi Liang, Marc Albrecht, Pierre-Yves Emelie, Sean C. Chang, Hyunwoo Nho, Mohammad Hajirostam, Myung-Je Cho, Shengkui Gao, Wei H. Yao, Yafei Bi
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Patent number: 10304411Abstract: Display panels and methods for operating a display panel are described. In an embodiment, the display panel includes a plurality of pixels arranged in rows and columns, a plurality of rows of emission control lines extending through the plurality of rows of pixels, and a global emission line coupled to the plurality of rows of emission control lines. Modes of operation of the display panel include global flash mode and low persistence mode.Type: GrantFiled: November 9, 2016Date of Patent: May 28, 2019Assignee: Apple Inc.Inventors: Koorosh Aflatooni, Sang Y. Youn, Mohammad Hajirostam, Yun Wang
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Publication number: 20190086992Abstract: An electronic display includes an active area having an array of pixels. The electronic display also includes multiple data power rails coupled to the active area that supply power to the array of pixels. The electronic display further includes data driving circuitry coupled to the multiple data power rails that drive the array of pixels. The electronic display also includes a controller coupled to the data driving circuitry having a processor. The processor causes the array of pixels to emit light based on a display brightness value. The processor also causes a pixel of the array of pixels to emit light at a brightness of gray level 0 by dynamically adjusting a data power rail of the multiple data power rails.Type: ApplicationFiled: July 5, 2018Publication date: March 21, 2019Inventors: Hung Sheng Lin, Hyunwoo Nho, Hyunsoo Kim, Shengkui Gao, Chun Lu, Sinan Alousi, Chin-Wei Lin, Jesse Aaron Richmond, Yafei Bi, Injae Hwang, Haifeng Li, Mohammad Hajirostam
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Publication number: 20180322823Abstract: Systems and methods for improving perceived image quality of an electronic display communicatively coupled to an image data source that outputs a synchronization control signal, which indicates when an image frame is expected to stop being written, based on a source clock signal. The electronic display includes a display pixel row, a display driver, and a timing controller. The timing controller determines a target scan time to be used to write the image frame to the display pixel row and instructs the display driver to write the image frame to the display pixel row based on the target scan time and a display block signal, in which the timing controller instructs the display driver to continue writing the image frame to display pixel row after the electronic display receives the synchronization control signal when the synchronization control signal is received before the target scan time is reached.Type: ApplicationFiled: September 21, 2017Publication date: November 8, 2018Inventors: Sinan Alousi, Haifeng Li, Mohammad Hajirostam, Yafei Bi
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Publication number: 20180268762Abstract: An electronic device includes processors that generate image data. The electronic device also includes an electronic display that displays the image data over a first frame duration by programming a first row of display pixels with the image data. The electronic display also displays the image data over the first frame duration by causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data. The electronic display further displays the image data over the first frame duration by resetting the first row of pixels before an end of the first frame duration.Type: ApplicationFiled: July 31, 2017Publication date: September 20, 2018Inventors: Hung Sheng Lin, Mohammad Ali Jangda, Injae Hwang, Rui Zhang, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Mohammad Hajirostam
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Publication number: 20180268758Abstract: An electronic device includes processors that generate image data. The electronic device also includes an electronic display that displays the image data over a first frame duration by programming a first row of display pixels with the image data. The electronic display also displays the image data over the first frame duration by causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data. The electronic display further displays the image data over the first frame duration by resetting the first row of pixels at least two times before an end of the first frame duration.Type: ApplicationFiled: April 27, 2018Publication date: September 20, 2018Inventors: Hung Sheng Lin, Mohammad Ali Jangda, Injae Hwang, Rui Zhang, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Mohammad Hajirostam
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Publication number: 20180174505Abstract: An electronic device may have a flexible display such as an organic light-emitting diode display. A strain sensing resistor may be formed on a bent tail portion of the flexible display to gather strain measurements. Resistance measurement circuitry in a display driver integrated circuit may make resistance measurements on the strain sensing resistor and a temperature compensation resistor to measure strain. A crack detection line may be formed from an elongated pair of traces that are coupled at their ends to form a loop. The crack detection line may run along a peripheral edge of the flexible display. Crack detection circuitry may monitor the resistance of the crack detection line to detect cracks. The crack detection circuitry may include switches that adjust the length of the crack detection line and thereby allow resistances to be measured for different segments of the line.Type: ApplicationFiled: February 13, 2018Publication date: June 21, 2018Inventors: Prashant Mandlik, Bhadrinarayana Lalgudi Visweswaran, Izhar Z Ahmed, Zhen Zhang, Tsung-Ting Tsai, Ki Yeol Byun, Yu Cheng Chen, Sungki Lee, Mohammad Hajirostam, Sinan Alousi
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Publication number: 20180158173Abstract: A display device may include a display having a pixels and a processor. The processor may receive image data, determine a digital offset value for a pixel based on a location of the pixel, such that the digital offset value compensates for one or more non-uniformity properties of the pixel. The processor may determine a scale factor associated with the pixel based on at least two of a luminance setting for the display, a driving mode of the display, and a gray level value for the pixel. The processor may then generate correction image data by applying the scale factor to the digital offset value, generate compensated image data based on the correction image data and the image data, and provide the compensated image data to the display.Type: ApplicationFiled: September 21, 2017Publication date: June 7, 2018Inventors: Shengkui GAO, Hung Sheng LIN, Hyunsoo KIM, Hyunwoo NHO, Katherine W. SONG, Mohammad HAJIROSTAM, Myung-Je CHO, Rui ZHANG, Sang Y. YOUN, Wei H. YAO, Yafei BI
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Publication number: 20180061366Abstract: Display panels and methods for operating a display panel are described. In an embodiment, the display panel includes a plurality of pixels arranged in rows and columns, a plurality of rows of emission control lines extending through the plurality of rows of pixels, and a global emission line coupled to the plurality of rows of emission control lines. Modes of operation of the display panel include global flash mode and low persistence mode.Type: ApplicationFiled: November 9, 2016Publication date: March 1, 2018Inventors: Koorosh Aflatooni, Sang Y. Youn, Mohammad Hajirostam, Yun Wang
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Publication number: 20180053466Abstract: An electronic device may have a flexible display such as an organic light-emitting diode display. A strain sensing resistor may be formed on a bent tail portion of the flexible display to gather strain measurements. Resistance measurement circuitry in a display driver integrated circuit may make resistance measurements on the strain sensing resistor and a temperature compensation resistor to measure strain. A crack detection line may be formed from an elongated pair of traces that are coupled at their ends to form a loop. The crack detection line may run along a peripheral edge of the flexible display. Crack detection circuitry may monitor the resistance of the crack detection line to detect cracks. The crack detection circuitry may include switches that adjust the length of the crack detection line and thereby allow resistances to be measured for different segments of the line.Type: ApplicationFiled: September 23, 2016Publication date: February 22, 2018Inventors: Rui Zhang, Mohammad Hajirostam, Hung Sheng Lin, Mohammad B. Vahid Far, Sang Y. Youn, Zhen Zhang, Prashant Mandlik, Sun-Il Chang, Jie Won Ryu, Shengkui Gao, Hyunwoo Nho, Wei H. Yao, Yafei Bi, Yun Wang