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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Abstract: This document describes techniques and apparatuses for a high-brightness mode on an organic light emitting diode (OLED) display. The techniques and apparatuses set a high-brightness value in a register of a display driver integrated circuit (DDIC) associated with the OLED display of on electronic device. A processor of the electronic device provides a fewer-pulses command to the DDIC, which adjusts a pulse number to control the OLED display at fewer pulses per period. A gamma correction is determined based on the high-brightness value and used to alter content to be presented on the OLED display. As a result, fewer pulses are used in combination with the gamma correction to provide content on the OLED display at a high brightness.

Abstract: This document describes systems and techniques directed at compensating for non-uniform luminance in curved-edge displays. In aspects, a computing device having a curved-edge 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 curved-edge display. Responsive to and based on the received indication of the luminance and a non-uniform luminance, the luminance manager determines a luminance modification for the pixels of the curved-edge display. Based on the determined luminance modification, the luminance manager modifies the luminance that is displayed or modifies the intended luminance that is intended to be displayed by pixels of the curved-edge display effective to compensate for the non-uniform luminance.

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.

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.

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.

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.

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.

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.

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.

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.