Apple Inc.

Qualcomm Mems Technologies, Inc.

Koorosh Aflatooni

Jean-Pierre Simon Guillou

Yafei Bi

Mohammad Ali Jangda

Sang Young Youn

Minhyuk Choi

Wei Hsin Yao

Chaohao Wang

Paolo Sacchetto

Mahesh B Chappalli

Pierre-Yves Emelie

Yingying Tang

Marc Albrecht

Sheng Zhang

Yunhui Hou

Myung-Je Cho

Wei Y Yao

Guy Cote

Hyunwoo Nho

Peter F Holland

Warren S Rieutort-Louis

Marc Joseph DeVincentis

Shengkui Gao

Gokhan Avkarogullari

Sean C Chang

Graeme M Williams

Mohammad Hajirostam

Sinan Alousi

Zhao Wang

Nao Sugawara Chuei

Yun Yu Wang

Shih Chang Chang

Paul Stephen Drzaic

Jim Chen Chou

Suryaprakash Ganti

Hung Sheng Lin

Kingsuk Brahma

Chieh-Wei Chen

Ahmad Al-Dahle

Jie Won Ryu

Manu Parmar

Young Bae Park

Russel A Martin

Jun Li

Christopher P Tann

Kenneth John Vampola

Wei Xiong

Arthur L Spence

Jae Won Choi

Dong Zheng

Yang Xu

Guy Côté

Yifan Zhang

Chun Lu

David S Zalatimo

Guocheng Shao

Jenny Hu

Yue Jack Chu

Wilhelmus Johannes Robertus Van Lier

Christopher M Dodson

Sameer M Venugopal

Alexey Kornienko

Farnaz Parhami

Kasra Omid-Zohoor

Wanqing Xin

Pramod Kumar Varma

Jongyup Lim

Giovanni Corradini

Asha G Karvaje

Adria Fores Herranz

Andrew D Pangborn

Martin Kocicka

Aishwarya Prem Renu

Erik G deJong

Ramesh K Goel

Jeho Lee

An electronic device may include an electronic display having multiple display pixels that display an image based on dithered image data. The electronic device may also include image processing circuitry that generates the dithered image data based on input image data and a threshold gray level that is greater than one. Generating the dithered image data may include replacing each gray level of the input image data that is less than the threshold gray level with either a zero gray level or the threshold gray level according to a dither pattern.

Multi-least significant bit (LSB) dithering systems and methods

Systems and methods are described herein to control brightness based on image content or other inputs to a display system. A dual-control system may integrate both slow control operations and fast control operations into a cohesive brightness management system. By using both shorter-term (e.g., fast control) and longer-term (e.g., slow control) brightness adjustment operations, the electronic device may quickly respond to high luminance and high brightness situations that may cause burn-in into the display, image artifacts, or other damage. Responding quickly to these high consumption situations may prevent damage or perceivable upset to an ongoing process, among other benefits.

Content dependent brightness management system

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

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

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

An electronic device may include an electronic display having multiple pixels to display an image based on processed image data. Each of the pixels may include multiple sub-pixels. The electronic device may also include image processing circuitry to receive input image data, in a first color space, having luminance values for each of the sub-pixels. The circuitry may also map the input image data from the first color space to a second color space and apply a multi-dimensional lookup table, based on the input image data in the second color space, to generate compensated image data. The lookup table may receive the luminance values for each of the sub-pixels and output corrected luminance values compensated for an expected amount of current leakage between the sub-pixels. The circuitry may also inversely map the compensated image data from the second color space to the first color space to generate the processed image data.

Pixel leakage and internal resistance compensation systems and methods

A display may have an active area that includes display pixels. The display may include an inactive notch region that extends into the active area. Data lines may provide image data from display driver circuitry to the display pixels. The image data may include data signals that correspond to portions of the display that do not include pixels, such as the inactive notch region. The null data signals may cause nonuniformities in the displayed image. The null data signals may be adjusted to minimize the nonuniformities. Null data signals corresponding to the inactive notch region may be adjusted to have gray levels that gradually decrease with distance from the border between the inactive notch and the active area. All of the data signals corresponding to the inactive notch may be set to a uniform gray level.

Data signal adjustment for displays

An electronic device may have a display with an array of pixels that display images for a user. The electronic device may have an ambient light sensor for gathering ambient light information. A subset of the pixels in the array of pixels may overlap the ambient light sensor so that ambient light passing through the subset of pixels may be measured. Each pixel may have an emission enable transistor coupled in series with a light-emitting diode. Control circuitry in the electronic device may disable the subset of pixels to reduce stray light during ambient light measurements while enabling remaining pixels in the array of pixels to display an image. Ambient light sensor circuitry may gather ambient light sensor measurements over one or more periods by using transfer transistors to transfer change from the photodetectors to charge storage capacitors formed from floating diffusions in a common substrate.

Electronic devices with ambient light sensors and emissive displays

An electronic device is provided. The electronic device includes a display that is configured to show content that includes a plurality of frames. The plurality of frames includes a first frame that is associated with a pre-transition value. The plurality of frames also includes a second frame that is associated with a current frame value that corresponds to a first luminance. Additionally, the electronic device is configured to determine an overdriven current frame value corresponding to a second luminance that is greater than the first luminance. The electronic device is also configured to display the second frame using the overdriven current frame value.

Overdrive for electronic device displays

Growing community of inventors

Los Altos Hills, CA, United States of America

Koorosh Aflatooni