Patents by Inventor Sun-Il Chang

Sun-Il Chang 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: 11189202
    Abstract: A system may include an electronic display panel having multiple pixels for depicting image data and processing circuitry that may receive a first error value representative of a first difference between a first electrical signal measured at a first pixel of the multiple pixels and an expected electrical signal for the first pixel. The first electrical signal may be based on a test signal transmitted to the first pixel and the expected electrical signal may correspond to an expected response of the first pixel based on the test signal. The processing circuitry may filter the first error value to generate a first compensated error value and may filter the first error value based on the first compensated error value to generate a second compensated error value, where the second compensated error value may filter one or more effects of spatial crosstalk between one or more pixels near the first pixel.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: November 30, 2021
    Assignee: Apple Inc.
    Inventors: Sun-Il Chang, Baris Cagdaser, Chaohao Wang, Derek Keith Shaeffer, Hyunsoo Kim, Hyunwoo Nho, Injae Hwang, Jesse Aaron Richmond, Jie Won Ryu, Junhua Tan, Kingsuk Brahma, Myung-Je Cho, Myungjoon Choi, Shengkui Gao, Shiping Shen, Wei H. Yao, Yunhui Hou
  • Patent number: 11164515
    Abstract: An electronic device comprises an electronic display having an active area having a pixel. The electronic device also comprises processing circuitry configured to receive image data to send to the pixel and adjust the image data to generate corrected image data based at least in part on a stored correction value for the pixel. The processing circuitry also is configured to generate a test data to send to the pixel subsequent to sending corrected image data to the pixel, wherein the test data is selected based upon a comparison of at least one aspect of the corrected image data with a threshold value.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: November 2, 2021
    Assignee: APPLE INC.
    Inventors: Hung Sheng Lin, Hyunwoo Nho, Sun-Il Chang, Junhua Tan, Jie Won Ryu, Shengkui Gao, Rui Zhang, Injae Hwang, Kingsuk Brahma, Jesse Aaron Richmond, Shiping Shen, Hyunsoo Kim
  • Patent number: 11158253
    Abstract: A display device may include a plurality of pixels configured to display image data on a display. The display device may also include a circuit that measures a first current associated with a light-emitting diode (LED) of a pixel of the plurality of pixels in response to the circuit receiving a first data voltage. The circuit may also measure a second current associated with the LED of the pixel of the plurality of pixels in response to the circuit receiving a second data voltage. The circuit may then determine a voltage associated with the LED based at least in part on the first current and the second current.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: October 26, 2021
    Assignee: Apple Inc.
    Inventors: Injae Hwang, Hung Sheng Lin, Hyunwoo Nho, Sun-Il Chang, Rui Zhang, Mohammad B. Vahid Far, Kingsuk Brahma, Jesse A. Richmond, Hyunsoo Kim, Junhua Tan
  • Patent number: 11158259
    Abstract: An apparatus receives current image frame data and data relating to at least one previous image frame for an electronic display. One or more parameters related to hysteresis of transistors in the electronic display are sensed. A correlation device, such as a look-up table, receives the sensed parameter or parameters and the data relating to one or more image frames, and uses this information, at least in part, to output an appropriate compensation signal for the current image frame data. The compensated current image frame data may then be supplied to the electronic display to reduce or eliminate the effects of hysteresis on the displayed image.
    Type: Grant
    Filed: November 3, 2020
    Date of Patent: October 26, 2021
    Assignee: Apple Inc.
    Inventors: Chaohao Wang, Chih-Wei Yeh, Chin-Wei Lin, Hung Sheng Lin, Hyunwoo Nho, Injae Hwang, Jie Won Ryu, Junhua Tan, Paolo Sacchetto, Rui Zhang, Shengkui Gao, Sun-Il Chang, Wei H. Yao, Howard H. Tang
  • Patent number: 11145702
    Abstract: A display panel includes a plurality of array sites arranged in an array defined by a plurality of rows and a plurality of columns. The display panel includes a first area of the array having a first pixel density and a second area of the array having a second pixel density lower than the first pixel density. The second area of the array includes a plurality of the array sites that are devoid of pixels. Rows of the second area that border the first area include at least one pixel and columns of the second area that border the first area include at least one pixel.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: October 12, 2021
    Assignee: Google LLC
    Inventors: Sun-Il Chang, Sangmoo Choi, Hyunchul Kim
  • Patent number: 11100845
    Abstract: A device may include a photosensitive transistor and a light-emitting diode. The light-emitting diode may include an anode. The anode may include a first portion having a first thickness and a second portion having a second thickness, wherein the second thickness is less than the first thickness. The device may also include driving circuitry that receives a data signal and causes light to emit from the light-emitting diode in response to the data signal. The photosensitive transistor may generate an electrical signal in response to light emitted from the light-emitting diode during the light emission.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: August 24, 2021
    Assignee: Apple Inc.
    Inventors: Hyunsoo Kim, Hung Sheng Lin, Hyunwoo Nho, Injae Hwang, Rui Zhang, Shengkui Gao, Shiping Shen, Sun-Il Chang
  • Patent number: 11037494
    Abstract: An example device includes a plurality of power converters configured to supply electrical power to a display, each optimized for a different output load current range; and a controller configured to: estimate a current level of the display; select, based on the estimated current level, a power converter of the plurality of power converters; and cause electrical power from the selected power converter to be supplied to the display.
    Type: Grant
    Filed: March 19, 2020
    Date of Patent: June 15, 2021
    Assignee: Google LLC
    Inventors: Sun-il Chang, Sang Young Youn
  • Publication number: 20210150950
    Abstract: Electronic devices and methods for compensating for aging or other effects in a display during a non-transmitting state (off state) of the display. Sensing may include emissive element sensing of the display and/or thin film transistor sensing of the display. Compensating for the effects may preserve or increase a uniformity of transmission of the display.
    Type: Application
    Filed: August 31, 2018
    Publication date: May 20, 2021
    Inventors: Chin-Wei Lin, Hung Sheng Lin, Hyunsoo Kim, Hyunwoo Nho, Injae Hwang, Jesse A. Richmond, Jie Won Ryu, Junhua Tan, Kavinaath Murugan, Kingsuk Brahma, Shengkui Gao, Shiping Shen, Sun-Il Chang, Myung-Je Cho, Yafei Bi
  • Publication number: 20210142721
    Abstract: A method includes displaying an image on an organic light-emitting (OLED) display panel that includes a first display area having a first pixel density and a second display area having a second pixel density lower than the first pixel density, and while displaying the image, deactivating individual pixels in the first display area corresponding to a proximity of the individual pixels to the second display area such that a region of the first display area adjacent the second display area has a virtual pixel density between the first pixel density and the second pixel density.
    Type: Application
    Filed: January 15, 2021
    Publication date: May 13, 2021
    Inventors: Hyunchul Kim, Sun-il Chang
  • Patent number: 10997914
    Abstract: A system may include a display panel that includes number of pixels that display image data on a display. The system may also include a circuit that measures a voltage associated with a light-emitting diode (LED) of a pixel of the number of pixels in response to the LED receiving a current. In addition to the circuit, the system may employ data processing circuitry that may generate a calibrated prediction model based at least in part on the voltage and the current, such that the calibrated prediction model predicts a change in voltage performance of the LED as the LED ages.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: May 4, 2021
    Assignee: Apple Inc.
    Inventors: Injae Hwang, Jiye Lee, Yifan Zhang, Hyunwoo Nho, Sun-Il Chang, Junhua Tan, Jie Won Ryu, Hyunsoo Kim, Myungjoon Choi, Shiping Shen, Kingsuk Brahma, Jesse A. Richmond
  • Publication number: 20210126059
    Abstract: A display panel includes a plurality of array sites arranged in an array defined by a plurality of rows and a plurality of columns. The display panel includes a first area of the array having a first pixel density and a second area of the array having a second pixel density lower than the first pixel density. The second area of the array includes a plurality of the array sites that are devoid of pixels. Rows of the second area that border the first area include at least one pixel and columns of the second area that border the first area include at least one pixel.
    Type: Application
    Filed: March 26, 2020
    Publication date: April 29, 2021
    Inventors: Sun-il Chang, Sangmoo Choi, Hyunchul Kim
  • Patent number: 10992911
    Abstract: A method for operating an electronic display includes receiving, using a controller, sensor data related to operational parameters of the electronic display based at least in part on illuminating a sense pixel of at least one row of pixels of the electronic display, wherein a first set of pixels below the at least one row of pixels renders a portion of a first image frame and a second set of pixels above the at least one row of pixels renders a portion of a second image frame. The method also includes adjusting, using the controller, image display on the electronic display based at least in part on the sensor data.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: April 27, 2021
    Assignee: Apple Inc.
    Inventors: Hung Sheng Lin, Hyunwoo Nho, Jie Won Ryu, Junhua Tan, Sun-Il Chang
  • Patent number: 10984731
    Abstract: An apparatus is described that includes a display panel and a sensor. The display panel includes an array of pixels configured to direct light through a front side of the display panel. Each pixel includes sub-pixels, each of which includes an organic light emitting diode (OLED) and an integrated circuit (IC) for controlling an electrical current to the OLED. The sensor is arranged at a back side of the display panel. The sensor includes an emitter configured to emit electromagnetic radiation transmitted through a first area of the display panel. The IC of sub-pixels of the array of pixels outside the first area includes a first IC arrangement. The IC of sub-pixels of the array of pixels within the first area includes a transistor in addition to the first IC arrangement. The transistor is configured to operate as a control switch controlling emission of light from the sub-pixel.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: April 20, 2021
    Assignee: Google LLC
    Inventors: Sangmoo Choi, Sun-il Chang, Sang Young Youn
  • Patent number: 10984713
    Abstract: An electronic display system may include a display panel used to display an image through emitting light. The electronic display system may also include processing circuitry that receives indication of an image to be displayed on the display panel and generates one or more signals to communicate the image on the display panel. The processing circuitry may compensate for non-uniformities in light emission between pixels of the display due to current-voltage non-uniformities.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: April 20, 2021
    Assignee: Apple Inc.
    Inventors: Junhua Tan, Chaohao Wang, Jun Li, Myungjoon Choi, Hyunsoo Kim, Shengkui Gao, Injae Hwang, Sun-Il Chang, Jie Won Ryu, Hyunwoo Nho, Shiping Shen
  • Patent number: 10950182
    Abstract: The present disclosure relates generally to systems and methods that may reduce a reduction in visual artifacts related to hysteresis of a light emitting diode (LED) electronic display. In one example, an electronic device may include a controller. The controller is may provide a signal to a pixel of a display of the electronic device while at least a portion of the display is turned off. The signal may include a first current and a second current. The first current may be designed to increase an ambient temperature corresponding to the pixel. The second current may be generated as part of an active panel conditioning operation. By applying the first current and the second current, hysteresis settling times from the pixel may improve, therefore improving speeds of sensing and compensation operations of the electronic device.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: March 16, 2021
    Assignee: Apple Inc.
    Inventors: Junhua Tan, Kingsuk Brahma, Jie Won Ryu, Shengkui Gao, Shiping Shen, Majid Gharghi, Hyunwoo Nho, Injae Hwang, Kavinaath Murugan, Sun-Il Chang, Chin-Wei Lin, Hyunsoo Kim, Rui Zhang, Jesse Aaron Richmond, Yun Wang, Hung Sheng Lin, Alex H. Pai, Chaohao Wang, Wei H. Yao
  • Publication number: 20210074207
    Abstract: An apparatus is described that includes an organic light emitting diode (OLED) display and a sensor. The OLED display includes a first area having a first pixel density, a second area having a second pixel density, and a third area having a third pixel density. The second area is arranged between the first area and the third area. The first pixel density is lower than the second pixel density. The second pixel density is lower than the third pixel density. The sensor is arranged to receive electromagnetic radiation transmitted through the first area of the OLED display.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 11, 2021
    Inventors: Sangmoo Choi, Sun-il Chang, Ion Bita
  • Patent number: 10943541
    Abstract: Current-voltage shift determination circuitry of a processing core complex coupled to the electronic display determines total current-voltage shift values at a pixel. The current-voltage shift determination circuitry then determines temperature-based current-voltage shift values at the pixel. The current-voltage shift determination circuitry extracts the temperature-based current-voltage shift values from the total current-voltage shift values to determine age-based voltage degradation values. Display compensation circuitry of the processing core complex adjusts display of image data by the pixel based on the age-based voltage degradation values. In this manner, voltage degradation due to pixel aging may be determined separately from current-voltage shift due to temperature, and, as such, be more accurately compensated for, resulting in better display of image data.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: March 9, 2021
    Assignee: Apple Inc.
    Inventors: Junhua Tan, Hsin-Ying Chiu, Sun-Il Chang, Yunhui Hou, Jie Won Ryu, Hyunwoo Nho, Weichuan Yao, Shiping Shen, Injae Hwang, Hyunsoo Kim, Myungjoon Choi, Shengkui Gao, Chaohao Wang, Kingsuk Brahma, Jesse Aaron Richmond, Myung-Je Cho, Changki Min, Wei H. Yao
  • Publication number: 20210065635
    Abstract: An apparatus is described that includes a display panel and a sensor. The display panel includes an array of pixels configured to direct light through a front side of the display panel. Each pixel includes sub-pixels, each of which includes an organic light emitting diode (OLED) and an integrated circuit (IC) for controlling an electrical current to the OLED. The sensor is arranged at a back side of the display panel. The sensor includes an emitter configured to emit electromagnetic radiation transmitted through a first area of the display panel. The IC of sub-pixels of the array of pixels outside the first area includes a first IC arrangement. The IC of sub-pixels of the array of pixels within the first area includes a transistor in addition to the first IC arrangement. The transistor is configured to operate as a control switch controlling emission of light from the sub-pixel.
    Type: Application
    Filed: September 3, 2019
    Publication date: March 4, 2021
    Inventors: Sangmoo Choi, Sun-il Chang, Sang Young Youn
  • Publication number: 20210049962
    Abstract: An apparatus receives current image frame data and data relating to at least one previous image frame for an electronic display. One or more parameters related to hysteresis of transistors in the electronic display are sensed. A correlation device, such as a look-up table, receives the sensed parameter or parameters and the data relating to one or more image frames, and uses this information, at least in part, to output an appropriate compensation signal for the current image frame data. The compensated current image frame data may then be supplied to the electronic display to reduce or eliminate the effects of hysteresis on the displayed image.
    Type: Application
    Filed: November 3, 2020
    Publication date: February 18, 2021
    Inventors: Chaohao Wang, Chih-Wei Yeh, Chin-Wei Lin, Hung Sheng Lin, Hyunwoo Nho, Injae Hwang, Jie Won Ryu, Junhua Tan, Paolo Sacchetto, Rui Zhang, Shengkui Gao, Sun-Il Chang, Wei H. Yao, Howard H. Tang
  • Publication number: 20210035485
    Abstract: A display panel includes a first set of pixels that each include a respective red sub-pixel and a respective green sub-pixel and a second set of pixels that each include a respective blue sub-pixel and a respective green sub-pixel, where the first set of pixels and the second set of pixels are arranged on the display panel such that at least one side of each of the pixels in the first set of pixels is adjacent to at least one of the pixels in the second set of pixels, at least one side of each of the pixels in the first set of pixels is not adjacent to any pixel, and the green sub-pixels are arranged on the display panel such that the green sub-pixels are evenly distributed in the display panel.
    Type: Application
    Filed: July 31, 2020
    Publication date: February 4, 2021
    Inventors: David Morris Hoffman, Sangmoo Choi, Sun-il Chang, Ion Bita