Apple Inc.

Yafei Bi

Wei Hsin Yao

Mohammad Bagher Vahid Far

Kingsuk Brahma

Hopil Bae

Hyunwoo Nho

Mohammad Ali Jangda

Hung Sheng Lin

Shengkui Gao

Koorosh Aflatooni

Jie Won Ryu

Sang Young Youn

Jesse Aaron Richmond

Jean-Pierre Simon Guillou

Haifeng Li

Chin-Wei Lin

Derek Keith Shaeffer

Ahmad Al-Dahle

Weijun Yao

Xiaofeng Wang

Minhyuk Choi

Paolo Sacchetto

Sun-il Chang

Junhua Tan

Sinan Alousi

Shinya Ono

Marc Joseph DeVincentis

Yue Jack Chu

Mohammad Hajirostam

Pierre-Yves Emelie

Mir Bahram Ghaderi

Christoph Horst Krah

Kevin J White

David A Stronks

Myung-Je Cho

Vanessa Cristina Heppolette

Wei Y Yao

Hung Shen Lin

Tsung-Ting Tsai

Chaohao Wang

Vasudha Gupta

Joshua P De Cesare

Yingxuan Li

Rui Zhang

Hasan Akyol

Arthur L Spence

Hyunsoo Kim

Shingo Hatanaka

Shiping Shen

Jiayi Jin

Myungjoon Choi

Venu Madhav Duggineni

Lei He

Thomas Charisoulis

Kasra Omid-Zohoor

Hyuck-Jae Lee

Yun Yu Wang

Wei Chen

Giovanni Gozzini

Kapil Vinod Sakariya

Mohammad Yeke Yazdandoost

Chieh-Wei Chen

Warren S Rieutort-Louis

Thomas James Wilson

Marc Albrecht

Brad W Simeral

Brian Jonathan Conner

Christopher P Tann

Baris Cagdaser

Prashant Mandlik

Shyuan Yang

Tore Nauta

Zhen Zhang

Injae Hwang

Henry C Jen

Yi Qiao

Yang Xu

Chun Lu

Sean C Chang

Graeme M Williams

Maofeng Yang

Eran Tamari

Anshi Liang

Ruo-Gu Huang

Zhe Hua

Kavinaath Murugan

Soojin Park

Guangmao Xing

Kenichi Ueno

Chieh-Chien Lin

Bhadrinarayana L Visweswaran

Yuichi Okuda

Weichuan Yao

Sun-II Chang

Katherine W Song

Josh P DeCesare

This disclosure provide various techniques for tracking emission profiles on an electronic display. An emission profile may be applied to the electronic display in order to illuminate certain pixels and deactivate (e.g., turn off) certain pixels in the electronic display to facilitate refreshing (e.g., programming with new image data) the deactivated pixels. A real-time row-based average pixel level or average pixel luminance calculation architecture may track the one or more EM profiles to accurately model EM profile behavior, which may enable accurate calculation of the average pixel level or average pixel luminance of the electronic display at any one point in time. The accurate average pixel level or average pixel luminance calculations effectuated by the EM profile tracking may be used to reduce the IR drop, improve real-time peak-luminance control, and improve the performance of under-display sensors, among other advantages.

Emission profile tracking for electronic displays

An electronic device may have a display with an array of pixels. The device may have an array of components such as an array of light sensors for capturing fingerprints of a user through an array of corresponding transparent windows in the display. A capacitive touch sensor, proximity sensor, force sensor, or other sensor may be used by control circuitry in the device to monitor for the presence of a user's finger over the array of light sensors. In response, the control circuitry can direct the display to illuminate a subset of the pixels, thereby illuminating the user's finger and causing reflected light from the finger to illuminate the array of light sensors for a fingerprint capture operation. The display may have display driver circuitry that facilitates the momentary illumination of the subset of pixels with uniform flash data while image data is displayed in other portions of the display.

Display with localized brightness adjustment capabilities

A system may include an electronic display panel having pixels, where each pixel may emit light based on a respective programming signal. The system may include a memory storing a map. The processing circuitry may determine a function for each pixel from the map. The processing circuitry may determine a respective control signal based on the function and a target brightness level for each pixel to generate multiple control signals, where the respective control signal is used to generate the respective programming signal for each pixel. The processing circuitry may determine a scaling factor based at least in part on the first map and may scale at least a subset of the multiple control signals based at least in part on the scaling factor.

Configurable pixel uniformity compensation for OLED display non-uniformity compensation based on scaling factors

Systems, methods, and devices are provided for providing intra-frame luminance scaling to avoid drawing excessive power while still providing exceptional brightness. An instantaneous average pixel luminance of an electronic display may be determined. The instantaneous average pixel luminance may correspond to an amount of light currently being emitted by the electronic display due to a previous image frame and a current image frame. Based at least in part on the instantaneous average pixel luminance, the luminance of a subset of pixels of image data of the current image frame may be adjusted, thereby allowing the electronic display to operate at a relatively high brightness level without exceeding a power limit.

Peak luminance control to enable higher display brightness

An electronic device may have a variable refresh rate display. Static content may be displayed on the display at a lower refresh rate than moving content to conserve power. The display may include an array of pixels. Display driver circuitry in the display may load image data into rows of the pixels. The display driver circuitry may have digital-to-analog converter circuitry that supplies data signals to the array. The display driver circuitry may respond to a variable refresh rate control signal that is asserted and deasserted depending on whether static or moving image content is to be displayed. The display driver circuitry may use the digital-to-analog converter circuitry to apply a time-varying scaling factor to the image data. The magnitude of the scaling factor may be adjusted during transitions between refresh rates to help suppress luminance variations that might otherwise result in flickering on the display.

Low-flicker variable refresh rate display

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.

Display off-time sensing

A display device may include rows of pixels that display image data on a display and a circuit. The circuit may receive pixel data value of image data for a pixel in a first row of the rows of pixels, determine a weight factor to apply to the pixel data value based on a position of the first row with respect to the other rows, such that each row is associated with a current-resistance (IR) drop across the display. The weight factor is determined based on a respective IR drop associated with the first row. The circuit may also generate a weighted pixel data value based on the weight factor and the pixel data value and send the weighted pixel data value to a display driver circuit that renders the image data via the display.

Systems and methods for compensating for IR drop across a display

Systems, methods, and apparatus to transition a display device between operating modes using a single dedicated pin of a circuit connected to the display device. The dedicated pin can receive a packet signal corresponding to an operating mode for the display device, and the circuit can thereafter cause the display device to transition into the desired operating mode in response to receiving the packet signal. The operating mode can be a low power on mode where an interface connected to the circuit is deactivated and at least some circuitry of the display device is throttled or powered off. The display device can be driven in an all black state while in the low power on mode, thereby allowing the display device to more quickly transition out of the low power on mode compared to when the display device is completely off.

Low power display on mode for a display device

A display device may include a plurality of pixels that may display image data on a display. The display device may also include a circuit that may receive pixel data including a gray level for at least one pixel of the plurality of pixels. The circuit may then receive an emission clock signal using a clock circuit based on the pixel data, such that the emission clock signal may cause the at least one pixel to receive a current for an amount of time based on the gray level. The circuit may then gate off the clock circuit after the amount of time.

Adaptive emission clocking control for display devices

Systems and methods for improving perceived image quality of an electronic display communicatively coupled to an image data source that outputs a synchronization control signal, which indicates when an image frame is expected to stop being written, based on a source clock signal. The electronic display includes a display pixel row, a display driver, and a timing controller. The timing controller determines a target scan time to be used to write the image frame to the display pixel row and instructs the display driver to write the image frame to the display pixel row based on the target scan time and a display block signal, in which the timing controller instructs the display driver to continue writing the image frame to display pixel row after the electronic display receives the synchronization control signal when the synchronization control signal is received before the target scan time is reached.

Display scan time compensation systems and methods

In situations with reduced image changes, display panels, such as the ones disclosed herein, may reduce their power consumption by performing self-refresh cycles, in which they may display locally stored data in the display panel instead of retrieving it from an image buffer. Methods and circuitry for management of the self-refresh cycle may reduce jitter, luminance errors, and/or flickers that may be caused by untimely self-refresh cycles that may occur as a result of latency in the image buffer. In some implementations, the display panel may have a dedicated low latency input that notifies an arrival of an incoming image. In some implementations, the self-refresh cycles of the panel may be managed by a host or a buffer that is responsible for sending the images.

Collision avoidance schemes for displays

Growing community of inventors

Palo Alto, CA, United States of America

Yafei Bi