Apple Inc.

Xuebei Yang

Hasan Akyol

John T Wetherell

Chung-Lun Edwin Hsu

Hopil Bae

Sheng Zhang

Henry C Jen

Xiaofeng Wang

Yingkan Lin

Chun-Ming Tang

Patrick B Bennett

Chaohao Wang

Derek Keith Shaeffer

Chun-Yao Huang

Baris Cagdaser

Shingo Hatanaka

Cheuk Chi Lo

Shengchang Cai

Lingtao Wang

Ali Tabatabaei

Runjie Xu

A sensing circuit includes at least a first gain stage and a controller for controlling the operation of the first gain stage. The first gain stage includes an amplifier having at least one input and one output, and a feedback loop coupled between the input and the output of the amplifier. The feedback loop includes a first capacitor coupled between the input and the output of the amplifier, and a second capacitor having a first terminal coupled to the input of the amplifier through a first switch and a second terminal coupled to the output of the amplifier through a second switch. The second capacitor is configured to be coupled in parallel to the first capacitor during a first portion of a measurement cycle, and disconnected from the first capacitor during a second portion of the measurement cycle.

Sensing circuit with enhanced dynamic range and accuracy

Systems and methods may reduce or eliminate image artifacts due to a defective pixel of an electronic display. An electronic display may include pixels that respectively include a self-emissive element, pixel drive circuitry that supplies a pixel drive current to drive the self-emissive element, and signal routing circuitry that reduces or eliminates a visual artifact due to a defective pixel among the pixels. The signal routing circuitry may do this by turning off the self-emissive element, supplying image data from the pixel drive circuitry to a first adjacent pixel, or receiving image data from other pixel drive circuitry from the first adjacent pixel or a second adjacent pixel.

Pixel screening and repair

Embodiments disclosed herein provide systems and methods for testing and repairing various aspects of an electronic display. The electronic display includes a reference array and an active array. The electronic display also includes test circuitry used to test individual or any combination of pixels of the electronic display. Switches may be disposed between the pixels and the test circuitry to be to repair the various components of the electronic display.

On-chip testing architecture for display system

Circuitry for screening defective portion of display chip

Defective display source driver screening and repair

Embodiments disclosed herein provide systems and methods for testing and compensating for pixel degradation in an electronic display based on current and voltage values sensed in a reference array. An electronic display includes an active array, a reference array, and sensing circuitry. A compensation manager obtains current data values of the reference array from the sensing circuitry. The compensation manager generates a current-voltage curve based on the current data and adjusts the current-voltage curve to compensate for variations in temperature and/or pixel brightness. In this way, the compensation manager may improve performance of the electronic display by, for example, by reducing visible anomalies.

Reference array current sensing

Dual-mode sense circuit with enhanced dynamic range and accuracy

Growing community of inventors

Fremont, CA, United States of America

Xuebei Yang