Apple Inc.

Jiye Lee

Yifan Zhang

Injae Hwang

Hyunwoo Nho

Kingsuk Brahma

Jie Won Ryu

Sun-il Chang

Junhua Tan

Jesse Aaron Richmond

Hyunsoo Kim

Shiping Shen

Myungjoon Choi

Tae-Wook Koh

Paul Stephen Drzaic

Tsung-Ting Tsai

Chaohao Wang

Chieh-Wei Chen

Weijun Yao

Shengkui Gao

David Andrew Doyle

Jiayi Jin

Chuang Qian

Maofeng Yang

Yongjun Li

Kiran S Pillai

Changki Min

Mathew K Mathai

Rebecca Park

James P Landry

Jesun Kim

Hongwei Chang

An electronic device may include an electronic display including display pixels to display an image based on compensated image data. The electronic display may also include a stressed reference pixel to exhibit burn-in related aging in response to one or more stress sessions and a non-stressed reference pixel configured to not undergo the one or more stress sessions. Additionally, the electronic device may include image processing circuitry to determine a panel-specific aging profile based on a comparison between one or more properties of the stressed reference pixel and the one or more properties of the non-stressed reference pixel. The image processing circuitry may also generate one or more gain maps based on the panel-specific aging profile and generate the compensated image data by applying the one or more gain maps to input image data.

Reference pixel stressing for burn-in compensation systems and methods

A current-voltage (IV) relationship of a pixel having a diode is initially determined. A first voltage is determined that does not cause the diode to emit light, and a first current across the diode is sensed by applying the first voltage. A predetermined current is determined based on the first voltage and the IV relationship. A ratio is determined based on the first current, a target current, and the predetermined current. A ratio voltage is determined by applying the ratio to a predetermined target voltage. If the first current is less than the predetermined current, then the ratio voltage is applied to supply a target current to the diode. If the first current is greater than the predetermined current, then a second voltage is determined by averaging the first test voltage and the ratio voltage, and the second voltage is applied to supply the target current to the diode.

Display compensation using current sensing across a diode without user detection

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.

Systems and methods for compensating pixel voltages

An electronic device may be provided with a display. A content generator may generate frames of image data to be displayed on the display. The display may have an array of pixels that emit light to display images. The pixels may contain light-emitting devices such as organic light-emitting diodes, quantum dot light-emitting diodes, and light-emitting diodes formed from discrete semiconductor dies. As a result of aging, the light producing capabilities of the light-emitting devices may degrade over time. The electronic device may have a temperature sensor that gathers temperature measurements and an ambient light sensor. A pixel luminance degradation compensator may apply compensation factors to uncorrected pixel luminance values associated with the frames of image data to produce corresponding corrected pixel luminance values for the display. The compensation factors may be based on aging history information such as pixel luminance history, ambient light exposure, and temperature measurements.

Light-emitting diode displays with predictive luminance compensation

Growing community of inventors

Mountain View, CA, United States of America

Jiye Lee