Patents by Inventor Prashant Shamarao

Prashant Shamarao 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: 11120732
    Abstract: A display driver includes: a receiver configured to receive image data of each line of a display panel from an external device; a line latch circuit having a line latch configured to latch the image data of each line received by the receiver in response to a strobe signal; a driving circuit section which drives the display panel in response to the image data latched by the line latch; and a timing controller configured to generate the strobe signal. The receiver is configured to detect occurrence of transmission error in data transmission about each line. The timing controller is configured to generate the strobe signal in response to a detection result of the occurrence of transmission error.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: September 14, 2021
    Assignee: Synaptics Incorporated
    Inventors: Kenji Yamazumi, Hirokazu Hatayama, Prashant Shamarao, Kota Kitamura
  • Publication number: 20200184879
    Abstract: A display driver includes: a receiver configured to receive image data of each line of a display panel from an external device; a line latch circuit having a line latch configured to latch the image data of each line received by the receiver in response to a strobe signal; a driving circuit section which drives the display panel in response to the image data latched by the line latch; and a timing controller configured to generate the strobe signal. The receiver is configured to detect occurrence of transmission error in data transmission about each line. The timing controller is configured to generate the strobe signal in response to a detection result of the occurrence of transmission error.
    Type: Application
    Filed: February 19, 2020
    Publication date: June 11, 2020
    Inventors: Kenji YAMAZUMI, Hirokazu HATAYAMA, Prashant SHAMARAO, Kota KITAMURA
  • Patent number: 10614747
    Abstract: A display driver includes: a receiver configured to receive image data of each line of a display panel from an external device; a line latch circuit having a line latch configured to latch the image data of each line received by the receiver in response to a strobe signal; a driving circuit section which drives the display panel in response to the image data latched by the line latch; and a timing controller configured to generate the strobe signal. The receiver is configured to detect occurrence of transmission error in data transmission about each line. The timing controller is configured to generate the strobe signal in response to a detection result of the occurrence of transmission error.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 7, 2020
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Kenji Yamazumi, Hirokazu Hatayama, Prashant Shamarao, Kota Kitamura
  • Patent number: 10394391
    Abstract: In an example, a processing system for an integrated display device and capacitive sensing device includes driver circuitry and a driver module. The driver circuitry is configured for coupling to a plurality of source lines and a plurality of sensor electrodes, where each of the plurality of sensor electrodes comprises at least one common electrode configured for display updating and capacitive sensing. The driver module is coupled to the driver circuitry and configured to drive the plurality of sensor electrodes for capacitive sensing during a first non-display update period that occurs between first and second display line update periods of a display frame, where the non-display update period is at least as long as one of the first and second display line update periods. The driver module is further configured to operate each of the plurality of source lines to reduce display artifacts during the non-display update period.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: August 27, 2019
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Joseph Kurth Reynolds, Stephen L. Morein, Prashant Shamarao
  • Patent number: 10375349
    Abstract: Bandwidth management includes receiving, by a branch device, a requested display identification data structure from a display device. The branch device modifies the requested display identification data structure based on a total bandwidth through a constricted port on the branch device to obtain a modified display identification data structure. The branch device transmits the modified display identification data structure to a source device.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: August 6, 2019
    Assignee: Synaptics Incorporated
    Inventors: Bradley C. Malemezian, Prashant Shamarao, Jeffrey A. Lukanc, Jifeng Liu, Xuexin Liu
  • Patent number: 10367662
    Abstract: A method and apparatus for a novel adaptive equalization technique for a Serializer/Deserializer receiver is disclosed. In one approach, adjustment of AC and DC gains is performed before DFE coefficients are adjusted. Further after the equalization an electrical idle threshold may be set based on the results of the equalization.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: July 30, 2019
    Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.
    Inventors: Prashant Shamarao, Yonggang Chen, Brad Luis
  • Publication number: 20180350878
    Abstract: A Method and Apparatus for a Transmission Gate for Multi-GB/s Application have been disclosed. By actively biasing the gate and body of both NFET and PFET improved performance is achieved.
    Type: Application
    Filed: September 24, 2011
    Publication date: December 6, 2018
    Applicant: Integrated Device Technology, Inc.
    Inventors: Yonggang Chen, Shriram Kulkarni, Prashant Shamarao
  • Patent number: 10063397
    Abstract: A method and apparatus for a novel adaptive equalization technique for a Serializer/Deserializer receiver is disclosed. In one approach, adjustment of AC and DC gains is performed before DFE coefficients are adjusted. Further after the equalization an electrical idle threshold may be set based on the results of the equalization.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: August 28, 2018
    Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.
    Inventors: Prashant Shamarao, Yonggang Chen, Brad Luis
  • Publication number: 20180218667
    Abstract: A display driver includes: a receiver configured to receive image data of each line of a display panel from an external device; a line latch circuit having a line latch configured to latch the image data of each line received by the receiver in response to a strobe signal; a driving circuit section which drives the display panel in response to the image data latched by the line latch; and a timing controller configured to generate the strobe signal. The receiver is configured to detect occurrence of transmission error in data transmission about each line. The timing controller is configured to generate the strobe signal in response to a detection result of the occurrence of transmission error.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 2, 2018
    Inventors: Kenji YAMAZUMI, Hirokazu HATAYAMA, Prashant SHAMARAO, Kota KITAMURA
  • Publication number: 20180218191
    Abstract: Embodiments herein describe an input device that includes a display area for outputting images which includes a capacitive sensing region. For example, the display area may include transparent sensor electrodes that can identify a location of an input object (e.g., a finger or stylus) within the sensing region. Moreover, the input device may include a fingerprint sensor disposed in a fan out region of a plurality of traces that are electrically coupled to display or capacitive sensing elements in the display area. The input device may include isolation logic disposed between the fingerprint sensor and the display area. When activated, the isolation logic electrically insulates a first portion of the traces in the fingerprint sensor from a second portion of the traces in the display area. Once disconnected, the input device can use the first portion of the traces to perform fingerprint sensing.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 2, 2018
    Inventors: Damien BERGET, Kasra KHAZENI, Prashant SHAMARAO
  • Publication number: 20180191996
    Abstract: Bandwidth management includes receiving, by a branch device, a requested display identification data structure from a display device. The branch device modifies the requested display identification data structure based on a total bandwidth through a constricted port on the branch device to obtain a modified display identification data structure. The branch device transmits the modified display identification data structure to a source device.
    Type: Application
    Filed: December 21, 2017
    Publication date: July 5, 2018
    Inventors: Bradley C. Malemezian, Prashant Shamarao, Jeffrey A. Lukanc, Jifeng Liu, Xuexin Liu
  • Patent number: 9983721
    Abstract: An example method of performing capacitive sensing and display updating in an integrated capacitive sensing device and display device includes driving a plurality of display electrodes with one or more display voltages from one or more supplies during a first time period, the one or more voltages configured to drive the display pixels. The method further includes initiating a long horizontal blanking interval during a second time period. The method further includes driving a plurality of sensor electrodes with one or more sensing voltages from the one or more supplies during the second time period to perform capacitive sensing. The method further includes activating first circuitry during one of the first time period or the second time period to draw current to equalize power drawn from the one or more supplies during the first and second time periods within a threshold.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: May 29, 2018
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Prashant Shamarao, Joseph Kurth Reynolds, Stephen L. Morein
  • Publication number: 20180095521
    Abstract: Embodiments described herein include a method for reducing power consumption in a capacitive touch sensor. The method includes driving the capacitive touch sensor with an operating voltage at a first voltage level. The method also includes entering the capacitive touch sensor into a sleep mode responsive to a lack of touch input to the capacitive touch sensor. The method includes reducing the operating voltage to a second voltage level, and driving the capacitive touch sensor with the operating voltage at the second voltage level.
    Type: Application
    Filed: September 30, 2016
    Publication date: April 5, 2018
    Inventors: Aswani TADINADA, Timothy L. BLANKENSHIP, Prashant SHAMARAO, Kaushalendra TRIPATHI, Sivan Kumar PANDIAN
  • Patent number: 9898150
    Abstract: In one embodiment, a system includes one or more source drivers operable to drive a portion of a row or column of a display. The system also includes a timing controller coupled to each of the one or more source drivers and configured to control the one or more source drivers. The system further includes a downstream link for each of the one or more source drivers, configured to transfer data from the timing controller to one of the one or more source drivers. The system also includes an upstream link for each of the one or more source drivers, configured to transfer uplink data from one of the one or more source drivers to the timing controller, wherein the uplink data includes at least one of downlink lock status information and touch data.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: February 20, 2018
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Stephen L. Morein, Prashant Shamarao, Zhibing Liu
  • Patent number: 9875211
    Abstract: A method, signal conditioning circuit, and system are disclosed to perform signal conditioning using a processing component coupled with at least first and second inputs. The processing component is further coupled with a first output port including first and second data lanes operable at different data rates. The method includes receiving, via the first input and at a first data rate, data included in a first input signal, and receiving, via the second input and at a second data rate different from the first data rate, data included in a second input signal. The method further includes driving, based on the first and second input signals, a first output signal onto the first output port, which includes transmitting the data included in the first input signal on the first data lane, and transmitting the data included in the second input signal on the second data lane.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: January 23, 2018
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Prashant Shamarao, Jeffrey Lukanc
  • Patent number: 9836173
    Abstract: An example method of performing capacitive sensing and display updating in an integrated capacitive sensing device and display device includes driving a plurality of sensor electrodes of the capacitive sensing device for input sensing during a blanking period. The method further includes driving a plurality of source lines using a plurality of source drivers during the blanking period to update a first display line of the display device. The method further includes driving the plurality of source lines using the plurality of source drivers during a display update period to update one or more additional display lines of the display device. The method further includes adjusting an operational mode of the plurality of source drivers during the blanking period to equalize display pixel settling between the blanking period and the display update period.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: December 5, 2017
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Prashant Shamarao, Joseph Kurth Reynolds, Stephen L. Morein
  • Publication number: 20170285793
    Abstract: An example method of performing capacitive sensing and display updating in an integrated capacitive sensing device and display device includes driving a plurality of sensor electrodes of the capacitive sensing device for input sensing during a blanking period. The method further includes driving a plurality of source lines using a plurality of source drivers during the blanking period to update a first display line of the display device. The method further includes driving the plurality of source lines using the plurality of source drivers during a display update period to update one or more additional display lines of the display device. The method further includes adjusting an operational mode of the plurality of source drivers during the blanking period to equalize display pixel settling between the blanking period and the display update period.
    Type: Application
    Filed: March 30, 2016
    Publication date: October 5, 2017
    Inventors: Prashant SHAMARAO, Joseph Kurth REYNOLDS, Stephen L. MOREIN
  • Publication number: 20170192581
    Abstract: An example method of performing capacitive sensing and display updating in an integrated capacitive sensing device and display device includes driving a plurality of display electrodes with one or more display voltages from one or more supplies during a first time period, the one or more voltages configured to drive the display pixels. The method further includes initiating a long horizontal blanking interval during a second time period. The method further includes driving a plurality of sensor electrodes with one or more sensing voltages from the one or more supplies during the second time period to perform capacitive sensing. The method further includes activating first circuitry during one of the first time period or the second time period to draw current to equalize power drawn from the one or more supplies during the first and second time periods within a threshold.
    Type: Application
    Filed: December 31, 2015
    Publication date: July 6, 2017
    Inventors: Prashant Shamarao, Joseph Kurth Reynolds, Stephen L. Morein
  • Publication number: 20160357699
    Abstract: A method, signal conditioning circuit, and system are disclosed to perform signal conditioning using a processing component coupled with at least first and second inputs. The processing component is further coupled with a first output port including first and second data lanes operable at different data rates. The method includes receiving, via the first input and at a first data rate, data included in a first input signal, and receiving, via the second input and at a second data rate different from the first data rate, data included in a second input signal. The method further includes driving, based on the first and second input signals, a first output signal onto the first output port, which includes transmitting the data included in the first input signal on the first data lane, and transmitting the data included in the second input signal on the second data lane.
    Type: Application
    Filed: June 4, 2015
    Publication date: December 8, 2016
    Inventors: Prashant SHAMARAO, Jeffrey LUKANC
  • Patent number: 9509308
    Abstract: A method for converting data signals from one power supply voltage domain for use in another power supply voltage domain. The method includes receiving the data signal at a first node of the integrated circuit, wherein the first node is within the first power supply voltage domain. The method also includes generating a first intermediate differential signal from the data signal via a first conversion circuit of the integrated circuit. The method further includes communicating the first intermediate differential signal to a first cross-coupled latch, wherein the first cross-coupled latch generates a first output signal based on the first intermediate differential signal. The method also includes outputting the first output signal from a second node of the integrated circuit, wherein the second node is in the second power supply voltage domain. Other embodiments, such as an integrated circuit, and an input device, are also provided.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: November 29, 2016
    Assignee: Synaptics Incorporated
    Inventors: Shao-Jen Lim, Prashant Shamarao