Patents by Inventor Chien-Hui Wen

Chien-Hui Wen 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: 20250046241
    Abstract: This document describes systems and techniques directed at zonal attenuation compensation. In aspects, a system includes a graphics processing unit configured to provide image data to a display panel. A zonal attenuation module is configured to combine a zonal attenuation mask with the image data to generate masked image data, the masked image data having a reduced brightness for portions of data corresponding to one or more regions on the display panel based on the zonal attenuation mask. An inverse zonal attenuation module is configured to apply an inverse zonal attenuation mask to the masked image data to reduce a brightness for additional portions of data corresponding to one or more additional regions on the display panel effective to offset increased brightness in the one or more additional regions on the display panel.
    Type: Application
    Filed: July 22, 2024
    Publication date: February 6, 2025
    Applicant: Google LLC
    Inventors: Hyunchul Kim, Chien-Hui Wen, Ken Kok Foo
  • Patent number: 12217722
    Abstract: Techniques and apparatuses are described that perform frequency compensation for a display. In aspects, a first uniformity of multiple regions of the display can be measured at a reference frequency. The display can then be driven at a second frequency and a second uniformity of the multiple regions of the display can be measured. The differences between the first and second uniformity can then be used to generate a compensation mask. XYZ domain data from the first and second uniformity measurements can be used to generate a color model characterization. The color model characterization can be used to convert the XYZ domain data into RGB data when the display is driven at the second frequency to compensate for the differences in uniformity across the multiple regions of the display.
    Type: Grant
    Filed: February 7, 2024
    Date of Patent: February 4, 2025
    Assignee: Google LLC
    Inventors: Hyunchul Kim, Chien-Hui Wen, Ken Kok Foo
  • Publication number: 20250037635
    Abstract: In general, the subject matter described in this disclosure can be embodied in technology for operating a display device that includes a pixel array. A first frame is programmed to the array, while the display device is operating at a first refresh rate, including by scanning the first frame line-by-line to the pixel array at a first scan rate. An indication that the display device is to transition from the first refresh rate to a second refresh rate is received. An intermediate frame is then programmed to the pixel array, including by scanning the intermediate frame line-by-line to the pixel array at an intermediate scan rate. A second frame is then programmed to the pixel array, while the display device is operating at the second refresh rate, including by scanning the second frame line-by-line to the pixel array at the second scan rate.
    Type: Application
    Filed: November 21, 2022
    Publication date: January 30, 2025
    Inventors: Chien-Hui WEN, John William KAEHLER, Sang Young YOUN, Ken Kok FOO
  • Patent number: 12183235
    Abstract: A method may include measuring, from a device having a display panel configured to operate at a first refresh rate or a second refresh rate, a difference in luminance of the display panel between the first refresh rate and the second refresh rate for an input gray level. The method may also include applying, based on the measured difference in luminance, a value offset to a default gamma value used by the device for the input gray level when the display panel is operating at the second refresh rate, thereby generating a new gamma value. The method may further include storing, at the device, the new gamma value, where subsequent to the storing, the device is configured to override the default gamma value for the input gray level with the new gamma value when the display panel is operating at the second refresh rate.
    Type: Grant
    Filed: May 25, 2021
    Date of Patent: December 31, 2024
    Assignee: GOOGLE LLC
    Inventors: Chien-Hui Wen, Hsin-Yu Chen, Ken Kok Foo, John William Kaehler
  • Publication number: 20240347022
    Abstract: Systems and techniques directed at dynamic power-saving mechanisms for displaying an image are disclosed. An electronic device determines an image to be displayed and an associated OPR for displaying the image. Based on the determined OPR, the electronic device generates a bionic image. Various mechanisms may be used to generate the bionic image. A display brightness value (DBV) or different blocking areas of the combined image may be used to generate the bionic image. The electronic device combines the image and the bionic image to form a combined image and presents the combined image on an emissive display. The combined image reduces a power expenditure of the emissive display that may otherwise be expended. The combined image may retain a high luminance for a focus area of the combined image while reducing the luminance for the remaining area (e.g., area outside of the focus area) of the combined image.
    Type: Application
    Filed: June 25, 2024
    Publication date: October 17, 2024
    Applicant: Google LLC
    Inventors: Hsin Hsueh Li, Chien-Hui Wen
  • Patent number: 12080215
    Abstract: An example device includes a display component that is configured to operate at a first brightness level or a second brightness level. The device also includes one or more processors operable to perform operations. The operations include detecting, by the display component and while the display component is operating at the first brightness level, a fingerprint authentication triggering event. The operations further include determining, based on the fingerprint authentication triggering event, a first portion of the graphical user interface to operate at the second brightness level. The operations also include transitioning the display component from the first brightness level to the second brightness level. The operations additionally include displaying a second portion of the display component based on applying, to the second portion, one of: (1) the first brightness level, or (2) a value offset to a gray level for the second brightness level.
    Type: Grant
    Filed: November 13, 2020
    Date of Patent: September 3, 2024
    Assignee: Google LLC
    Inventor: Chien-Hui Wen
  • Publication number: 20240265859
    Abstract: A non-transitory computer-readable storage medium can include instructions stored thereon that, when executed by at least one processor, are configured to cause a computing device to determine, in response to a change in a refresh rate of a display, an encoded intensity of at least a portion of an image presented by the display, determine that the encoded intensity is within a predetermined range, and based on determining that the encoded intensity is within the predetermined range, adjust an intensity of a signal for the portion of the image.
    Type: Application
    Filed: March 28, 2024
    Publication date: August 8, 2024
    Inventors: Ken Kok Foo, John William Kaehler, Chien-Hui Wen
  • Publication number: 20240221575
    Abstract: An example method includes determining, for a device having a display component configured to operate at multiple brightness levels and for a range of DBVs, a gamma value offset to a default gamma value at the second brightness level. The method includes determining, for a tap point representative of the range, a brightness value offset to a default brightness value at the second brightness level. The method includes storing the gamma value offset and the brightness value offset. Subsequent to the storing, the device is configured to transition, in response to a fingerprint authentication triggering event, the display component from a first brightness level to a second brightness level by: overriding a default gamma value based on the gamma value offset, and displaying a portion of the display component by applying a value offset to a default brightness value at the second brightness level based on the brightness value offset.
    Type: Application
    Filed: July 30, 2021
    Publication date: July 4, 2024
    Inventors: Chien-Hui Wen, Hsin-Yu Chen
  • Patent number: 12008836
    Abstract: This document describes systems and techniques for spatially and temporally dynamic illumination for fingerprint authentication. In aspects, a method is disclosed that involves receiving user input at a display of an electronic device, initiating biometric authentication, and instructing a display-driver integrated circuit (DDIC) to implement a local high-brightness mode, which causes a predetermined portion of the display to increase in luminance to a target luminance for at least a first interval and a second interval. The DDIC is also instructed to cause a variable portion of the display to increase in luminance for the first interval and, at the expiration of the first interval, decrease luminance. During the first and/or second interval, an under-display fingerprint sensor captures one or more images. It is then determined, based on analysis of the one or more images, whether the user input is indicative of an authorized user.
    Type: Grant
    Filed: May 5, 2023
    Date of Patent: June 11, 2024
    Assignee: Google LLC
    Inventors: Hyunchul Kim, Chien-Hui Wen
  • Publication number: 20240177687
    Abstract: Techniques and apparatuses are described that perform frequency compensation for a display. In aspects, a first uniformity of multiple regions of the display can be measured at a reference frequency. The display can then be driven at a second frequency and a second uniformity of the multiple regions of the display can be measured. The differences between the first and second uniformity can then be used to generate a compensation mask. XYZ domain data from the first and second uniformity measurements can be used to generate a color model characterization. The color model characterization can be used to convert the XYZ domain data into RGB data when the display is driven at the second frequency to compensate for the differences in uniformity across the multiple regions of the display.
    Type: Application
    Filed: February 7, 2024
    Publication date: May 30, 2024
    Applicant: Google LLC
    Inventors: Hyunchul Kim, Chien-Hui Wen, Ken Kok Foo
  • Publication number: 20240169923
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for brightness control for under-display fingerprint sensor are disclosed. A method includes receiving, at a computing device, an indication to activate an under-display sensor that is located underneath a display of the computing device; activating a collection of LEDs of the display to provide illumination for the under-display sensor, including activating an LED in the collection of LEDs by: establishing, by drive circuitry of the LED, a first overdriven voltage across an LED-driving transistor that is arranged to energize the LED; establishing a second overdriven voltage across the LED-driving transistor; and establishing a steady state voltage across the LED-driving transistor; and activating the under-display sensor by reading a signal from the under-display sensor once the collection of LEDs has activated, including once the steady state voltage has been programmed across the LED-driving transistor.
    Type: Application
    Filed: January 25, 2024
    Publication date: May 23, 2024
    Inventors: Sang Young Youn, Chien-Hui Wen
  • Patent number: 11972723
    Abstract: A non-transitory computer-readable storage medium can include instructions stored thereon that, when executed by at least one processor, are configured to cause a computing device to determine, in response to a change in a refresh rate of a display, an encoded intensity of at least a portion of an image presented by the display, determine that the encoded intensity is within a predetermined range, and based on determining that the encoded intensity is within the predetermined range, adjust an intensity of a signal for the portion of the image.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: April 30, 2024
    Assignee: Google LLC
    Inventors: Ken Kok Foo, John William Kaehler, Chien-Hui Wen
  • Publication number: 20240135854
    Abstract: A method involves measuring, for an optical property of the display panel for an input gray level and at a first refresh rate, first and second values at respective first and second ambient brightness levels. The method also involves determining a compensation factor for the input gray level at the first refresh rate. The method further involves determining a modified gamma value at a second refresh rate, wherein the modified gamma value reduces a perceived optical defect of the display panel when operating at the second refresh rate by maintaining a consistent delta difference in values for the optical property between the first and second refresh rates at different ambient brightness levels. The method additionally involves storing the modified gamma value, where the device is configured to adjust input display data using the modified gamma value when transitioning from the first refresh rate to the second refresh rate.
    Type: Application
    Filed: April 12, 2021
    Publication date: April 25, 2024
    Inventors: Chien-Hui Wen, Hsin-Yu Chen
  • Publication number: 20240096256
    Abstract: An example device includes a display component that is configured to operate at a first refresh rate or a second refresh rate. The device also includes one or more processors operable to perform operations. The operations include identifying a rate change triggering event while the display component is operating at the first refresh rate. The operations further include determining a current brightness value of the display component. The operations also include determining, based on an environmental state measurement associated with an environment around the device, a threshold brightness value. The operations additionally include transitioning the display component from the first refresh rate to the second refresh rate m response to identifying the rate change triggering event if the current brightness value of the display component meets or exceeds the threshold brightness value.
    Type: Application
    Filed: November 29, 2023
    Publication date: March 21, 2024
    Inventors: Chien-Hui Wen, Yichi Chen, Hsin-Yu Chen
  • Publication number: 20240087494
    Abstract: A method for calibrating input display data for multiple display refresh rates comprises measuring (1210) an optical property of a display panel for an input gray level at a first refresh rate, measuring (1220) the optical property for a plurality of candidate gray levels at a second refresh rate, selecting (1230), based on the measured optical properties of the display panel, a corresponding gray level for the input gray level, wherein the corresponding gray level is selected from the plurality of candidate gray levels and storing (1240), at the device, the corresponding gray level for the input gray level, wherein subsequent to the storing, the device is configured to adjust input display data using the corresponding gray level for the input gray level when the display panel is transitioning from the first refresh rate to the second refresh rate.
    Type: Application
    Filed: January 25, 2021
    Publication date: March 14, 2024
    Inventors: Chien-Hui Wen, Hsin-Yu Chen
  • Publication number: 20240062718
    Abstract: This document describes systems and techniques directed at expediting fingerprint authentication via variable refresh rate control and display luminance compensation. In aspects, a computing device having an under-display fingerprint sensor (UDFPS) and a touch-sensitive display includes a biometric authentication manager. Upon detecting at least one finger at or near the touch-sensitive display, the biometric authentication manager implements variable display refresh rates and selectively adjusts luminance settings for a high-luminance region of the touch-sensitive display for predetermined intervals. In so doing, at least one finger can be well-illuminated during UDFPS image capturing, facilitating UDFPS sensing and expediting fingerprint authentication.
    Type: Application
    Filed: October 25, 2023
    Publication date: February 22, 2024
    Applicant: Google LLC
    Inventors: Jyothi Karri, Chien-Hui Wen
  • Patent number: 11908415
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for brightness control for under-display fingerprint sensor are disclosed. A method includes receiving, at a computing device, an indication to activate an under-display sensor that is located underneath a display of the computing device; activating a collection of LEDs of the display to provide illumination for the under-display sensor, including activating an LED in the collection of LEDs by: establishing, by drive circuitry of the LED, a first overdriven voltage across an LED-driving transistor that is arranged to energize the LED; establishing a second overdriven voltage across the LED-driving transistor; and establishing a steady state voltage across the LED-driving transistor; and activating the under-display sensor by reading a signal from the under-display sensor once the collection of LEDs has activated, including once the steady state voltage has been programmed across the LED-driving transistor.
    Type: Grant
    Filed: October 18, 2021
    Date of Patent: February 20, 2024
    Assignee: Google LLC
    Inventors: Sang Young Youn, Chien-Hui Wen
  • Patent number: 11908416
    Abstract: A method, includes: (i) receiving information about an ambient light level; (ii) receiving image frame data for an active matrix display panel with an array of pixels each having a light emitting diode (LED) and a pixel circuit to control current supplied to the LED; (iii) selecting a selected current-resistance compensation (IRC) setting based on the information about the ambient light value; (iv) selecting a selected source voltage level based on the selected IRC setting that was selected by the computing system; (v) generating compensated image frame data for the image frame based on the received image frame data and the selected IRC setting; and (vi) displaying the image frame by supplying data signals based on the compensated image frame data to corresponding pixels from the array of pixels, while applying a source voltage corresponding to the selected source voltage level to all of the pixels.
    Type: Grant
    Filed: May 10, 2021
    Date of Patent: February 20, 2024
    Assignee: Google LLC
    Inventors: Chien-Hui Wen, Sang Young Youn
  • Publication number: 20240046874
    Abstract: This document describes systems and techniques directed at compensating for voltage losses in organic light-emitting diode (OLED) displays. In aspects, a computing device having an OLED display and a luminance manager is configured to receive an indication of a luminance that is, or is intended to be, displayed by pixels of the OLED display. Responsive to and based on the received indication of luminance and a voltage loss, the luminance manager determines a luminance modification for the pixels of the OLED display. Based on the determined luminance modification, the luminance manager modifies the luminance that is displayed or modifies the luminance that is intended to be displayed by the pixels of the OLED display effective to compensate for the voltage loss.
    Type: Application
    Filed: October 17, 2023
    Publication date: February 8, 2024
    Applicant: Google LLC
    Inventors: XiaoPing Bai, Chien-Hui Wen, Ken Kok Foo
  • Patent number: 11881162
    Abstract: In general, techniques are described for image modification for under-display sensors. A computing device comprising a display, one or more sensors positioned underneath the display, and one or more processors may be configured to perform various aspects of the techniques. The display may be configured to allow the one or more sensors to operate through the display. The one or more processors may be configured to determine an ambient light level, and modify, based on the ambient light level, an area of an image to obtain a modified image. The area of the image may correspond to pixels of the display positioned above the one or more sensors or correspond to pixels of the display that are not positioned above the one or more sensors. The one or more processors may then interface, with the display, to output the modified image.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: January 23, 2024
    Assignee: Google LLC
    Inventors: Sangmoo Choi, Xiaoping Bai, Chien-Hui Wen