Patents by Inventor Yaser Azizi

Yaser Azizi 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).

  • Publication number: 20140285407
    Abstract: A system extracts effective parameters from a pixel circuit that includes a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. The system measures the value of at least one operating parameter of the pixel circuit at a plurality of levels, and then extracts the value of at least one related parameter of the pixel circuit, based on the measured values of the at least one operating parameter. The measured values of the operating parameter are translated to effective values for driving the pixel circuit, based on the extracted value. Then effective parameters for driving effective devices in the pixel circuit are extracted, based on the translated values, and stored for use in compensating input signals to the pixel circuit.
    Type: Application
    Filed: April 25, 2014
    Publication date: September 25, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Ricky Yik Hei Ngan, Nino Zahirovic, Yaser Azizi, Arokia Nathan, Peyman Servati, Ali Ghadiri Bayekolaee
  • Publication number: 20140252988
    Abstract: The OLED voltage of a selected pixel is extracted from the pixel produced when the pixel is programmed so that the pixel current is a function of the OLED voltage. One method for extracting the OLED voltage is to first program the pixel in a way that the current is not a function of OLED voltage, and then in a way that the current is a function of OLED voltage. During the latter stage, the programming voltage is changed so that the pixel current is the same as the pixel current when the pixel was programmed in a way that the current was not a function of OLED voltage. The difference in the two programming voltages is then used to extract the OLED voltage.
    Type: Application
    Filed: March 8, 2013
    Publication date: September 11, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Yaser Azizi, Gholamreza Chaji
  • Publication number: 20140225883
    Abstract: A system and method for extracting a parasitic capacitance value from a pixel circuit including a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. The system and method determine the biasing voltage of an internal node of the pixel circuit during a driving cycle for a desired measurement level, and modify voltages of the pixel circuit that do not affect said biasing voltage to eliminate unwanted cross talk. In different implementations, the biasing voltage is determined by measuring the voltage at an internal node, or by calculating the voltage at the internal node.
    Type: Application
    Filed: April 15, 2014
    Publication date: August 14, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Ricky Yik Hei Ngan, Nino Zahirovic, Yaser Azizi, Arokia Nathan, Peyman Servati
  • Publication number: 20140198092
    Abstract: Systems and methods detect and compensate for process or performance-related non-uniformities and/or degradation in displays. The systems and methods can compare a device current with one or more reference currents to generate an output signal indicative of the difference between the device and reference currents. This output voltage can be amplified, and quantized and then be used to determine how the device current differs from the reference current and to adjust the programming voltage for the device of interest accordingly.
    Type: Application
    Filed: January 14, 2014
    Publication date: July 17, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Yaser Azizi, Joseph Marcel Dionne, Nino Zahirovic, Gholamreza Chaji
  • Publication number: 20140084932
    Abstract: A system reads a desired circuit parameter from a pixel circuit that includes a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. One embodiment of the extraction system turns off the drive device and supplies a predetermined voltage from an external source to the light emitting device, discharges the light emitting device until the light emitting device turns off, and then reads the voltage on the light emitting device while that device is turned off. The voltages on the light emitting devices in a plurality of pixel circuits may be read via the same external line, at different times.
    Type: Application
    Filed: December 2, 2013
    Publication date: March 27, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Ricky Yik Hei Ngan, Nino Zahirovic, Yaser Azizi
  • Publication number: 20140062993
    Abstract: A system reads a desired circuit parameter from a pixel circuit that includes a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. One embodiment of the extraction system extracts a parasitic capacitance value from a pixel circuit by measuring at least one parameter of the pixel circuit when in a first state having a first set of operating voltages and currents, measuring at least one parameter of the pixel circuit when in a second state having a second set of operating voltages and currents different from the first set, and extracting the value of a selected parasitic capacitance from the measurements.
    Type: Application
    Filed: November 11, 2013
    Publication date: March 6, 2014
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Yaser Azizi
  • Patent number: 8599191
    Abstract: A system to improve the extraction of transistor and OLED parameters in an AMOLED display includes a pixel circuit having an organic light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input to provide the programming signal, and a storage device to store the programming signal. A charge-pump amplifier has a current input and a voltage output. The charge-pump amplifier includes an operational amplifier in negative feedback configuration. The feedback is provided by a capacitor connected between the output and the inverting input of the operational amplifier. A common-mode voltage source drives the non-inverting input of the operational amplifier. An electronic switch is coupled across the capacitor to reset the capacitor. A switch module including the input is coupled to the output of the pixel circuit and an output is coupled to the input of the charge-pump amplifier.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 3, 2013
    Assignee: Ignis Innovation Inc.
    Inventors: Gholamreza Chaja, Yaser Azizi
  • Publication number: 20130314394
    Abstract: A method for characterizing and eliminating the effect of propagation delay on data and monitor lines of AMOLED panels is introduced. A similar technique may be utilized to cancel the effect of incomplete settling of select lines that control the write and read switches of pixels on a row.
    Type: Application
    Filed: March 13, 2013
    Publication date: November 28, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Yaser Azizi
  • Publication number: 20130307834
    Abstract: Disclosed is a system and method to improve the extraction of transistor and OLED parameters in an AMOLED display for compensation of programming voltages to improve image quality. A pixel circuit includes an organic light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input to provide the programming signal, and a storage device to store the programming signal. A charge-pump amplifier has a current input and a voltage output. The charge-pump amplifier includes an operational amplifier in negative feedback configuration. The feedback is provided by a capacitor connected between the output and the inverting input of the operational amplifier. A common-mode voltage source drives the non-inverting input of the operational amplifier. An electronic switch is coupled across the capacitor to reset the capacitor.
    Type: Application
    Filed: July 25, 2013
    Publication date: November 21, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Yaser Azizi
  • Patent number: 8576217
    Abstract: Disclosed is a system and method to improve the extraction of transistor and OLED parameters in an AMOLED display for compensation of programming voltages to improve image quality. A pixel circuit includes an organic light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input to provide the programming signal, and a storage device to store the programming signal. A charge-pump amplifier has a current input and a voltage output. The charge-pump amplifier includes an operational amplifier in negative feedback configuration. The feedback is provided by a capacitor connected between the output and the inverting input of the operational amplifier. A common-mode voltage source drives the non-inverting input of the operational amplifier. An electronic switch is coupled across the capacitor to reset the capacitor.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: November 5, 2013
    Assignee: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Yaser Azizi
  • Publication number: 20130257845
    Abstract: A method of voltage-programming a pixel circuit in a display panel to remove, before programming the pixel circuit, effects due to short-term effects such as caused by fast light transitions or effects due to previous pixel circuit measurements such as charge trapping. During a resetting cycle, the pixel circuit is programmed with a reset voltage value corresponding to a maximum or a minimum voltage value. Then, during a calibration cycle, the pixel circuit is programmed with a calibration voltage based on previously extracted data for the pixel circuit, a pixel current of the pixel circuit is measured, and the extracted data for the pixel circuit is updated based on the measured pixel current. Then, the pixel circuit is programmed with a video data that is calibrated with the updated extracted data. The pixel circuit is finally driven according to the programmed video data and emits a commensurate amount of light.
    Type: Application
    Filed: May 9, 2013
    Publication date: October 3, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Joseph Marcel Dionne, Yaser Azizi, Javid Jaffari, Abbas Hormati, Tong Liu, Stefan Alexander
  • Publication number: 20130235023
    Abstract: A voltage-programmed display system allows measurement of effects on pixels in a panel that includes both active pixels and reference pixels coupled to a supply line and a programming line. The reference pixels are controlled so that they are not subject to substantial changes due to aging and operating conditions over time. A readout circuit is coupled to the active pixels and the reference pixels for reading at least one of current, voltage or charge from the pixels when they are supplied with known input signals. The readout circuit is subject to changes due to aging and operating conditions over time, but the readout values from the reference pixels are used to adjust the readout values from the active pixels to compensate for the unwanted effects.
    Type: Application
    Filed: April 24, 2013
    Publication date: September 12, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Joseph Marcel Dionne, Yaser Azizi, Javid Jaffari, Abbas Hormati, Tong Liu, Stefan Alexander
  • Publication number: 20130100173
    Abstract: Circuits for programming a circuit with decreased programming time are provided. Such circuits include a storage device such as a capacitor for storing display information and for ensuring a driving device such as a driving transistor drives a light emitting device according to the display information. The present disclosure provides driving schemes for decreasing flickering perceived while displaying video content by introducing idle phases in between in emission phases to increase the effective refresh rate of a display. Driving schemes are also disclosed for reducing the effects of cross-talk by ensuring that programming information is refreshed in a display array that utilizes a driver connected to multiple data lines via a multiplexer.
    Type: Application
    Filed: May 26, 2012
    Publication date: April 25, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Jackson Chi Sun Lai, Yaser Azizi, Maran Ran Ma
  • Publication number: 20130099692
    Abstract: Circuits for programming a circuit with decreased programming time are provided. Such circuits include a storage device such as a capacitor for storing display information and for ensuring a driving device such as a driving transistor drives a light emitting device according to the display information. To increase programming time, the pixel circuits may be pre-charged or a biasing current may be applied to charge and/or discharge a data line and/or the driving device. Aspects of the present disclosure allow for the biasing current to drain partially through the storage device to allow the portion of the biasing current applied to the driving device to remain small while the data line discharges. Furthermore, the present disclosure provides display architectures and operation schemes for display arranged in segments each including a plurality of pixel circuits.
    Type: Application
    Filed: May 26, 2012
    Publication date: April 25, 2013
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Jackson Chi Sun Lai, Yaser Azizi, Maran Ran Ma, Arokia Nathan
  • Publication number: 20120293478
    Abstract: Disclosed is a system and method to improve the extraction of transistor and OLED parameters in an AMOLED display for compensation of programming voltages to improve image quality. A pixel circuit includes an organic light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input to provide the programming signal, and a storage device to store the programming signal. A charge-pump amplifier has a current input and a voltage output. The charge-pump amplifier includes an operational amplifier in negative feedback configuration. The feedback is provided by a capacitor connected between the output and the inverting input of the operational amplifier. A common-mode voltage source drives the non-inverting input of the operational amplifier. An electronic switch is coupled across the capacitor to reset the capacitor.
    Type: Application
    Filed: May 20, 2011
    Publication date: November 22, 2012
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Yaser Azizi
  • Publication number: 20110130981
    Abstract: Methods and systems to provide baseline measurements for aging compensation for a display device are disclosed. An example display system has a plurality of active pixels and a reference pixel. Common input signals are provided to the reference pixel and the plurality of active pixels. The outputs of the reference pixel is measured and compared to the output of the active pixels to determine aging effects. The display system may also be tested applying a first known reference current to a current comparator with a second variable reference current and the output of a device under test such as one of the pixels. The variable reference current is adjusted until the second current and the output of the device under test is equivalent of the first current. The resulting current of the device under test is stored in a look up table for a baseline for aging measurements during the display system operation.
    Type: Application
    Filed: November 30, 2010
    Publication date: June 2, 2011
    Applicant: Ignis Innovation Inc.
    Inventors: Gholamreza Chaji, Joseph Marcel Dionne, Yaser Azizi, Javid Jaffari, Abbas Hormati, Tong Liu, Stefan Alexander