Apple Inc.

University of Michigan

Yao Shi

Hyunwoo Nho

Jie Won Ryu

Kingsuk Brahma

Hyunsoo Kim

Myungjoon Choi

Li-Xuan Chuo

Wei Hsin Yao

Chaohao Wang

David D Wentzloff

ByoungSuk Kim

Shatam Agarwal

Vehbi Calayir

Alex H Pai

Chin-Wei Lin

David Theodore Blaauw

Shinya Ono

Sun-il Chang

Mahesh B Chappalli

Shengkui Gao

Wei Xiong

Kyung Wook Kim

Kwang Soon Park

David S Zalatimo

Yue Jack Chu

Rungrot Kitsomboonloha

Jason N Gomez

Graeme M Williams

Pei-En Chang

Jason C Hu

Hassan Edrees

James E Brown

Ce Zhang

Steven N Hanna

Ionut A Mirel

Patrick R Cruce

Sachiko Oda

Xing Chen

Jesse R Manders

Evan P Donoghue

Abdullah Mohammed G Alghaihab

Ruicong Chen

Nicolas Le Dortz

Embodiments herein provide various apparatuses and techniques to efficiently mitigate front-of-screen (FoS) artifacts that may occur due to voltage fluctuations due to alternating current (AC) or direct current (DC) mechanisms that may occur in a variety of pixel types. In one embodiment, emission profile awareness circuitry may be implemented to mitigate for FoS artifacts due to DC mechanisms. Two-dimensional (2D) digital compensation circuitry may address the DC portion of the voltage fluctuations by accounting for an emission profile applied to content displayed on an electronic display. In some embodiments, the 2D digital compensation circuitry may compensate for the AC portion of the voltage fluctuations by duplicating the AC voltage fluctuations via voltage error subtraction circuitry and voltage error accumulation circuitry.

Feedforward compensation of high-luminance banding Mura compensation

An electronic display may include a touch sensing system configured to perform touch sensing in an active area of the electronic display and display driver circuitry configured to program display pixels of the active area to emit light. The electronic display may also include the active area. The active area may include a first portion and a second portion that are at least partially electrically separated. The display driver circuitry may program the display pixels in the first portion while the touch sensing circuitry may perform touch sensing in the second portion.

Split display driver circuitry to mitigate touch sensing system interaction

This disclosure provides various techniques for providing fine-grain digital and analog pixel compensation to account for voltage error across an electronic display. By employing a two-dimensional digital compensation and a local analog compensation, a fine-grain and robust pixel compensation scheme may be provided to the electronic display.

Two-dimensional content-adaptive compensation to mitigate display voltage drop

An electronic device may include an electronic display having multiple display pixels to display an image based on analog voltage signals. The electronic device may also include optical calibration circuitry to generate digital-to-analog converter (DAC) data based on image data associated with the image and dither circuitry to reduce a bit-depth of the DAC data, generating dithered DAC data. Additionally, the electronic device may include a gamma generator having one or more DACs to generate the analog voltage signals based on the dithered DAC data, which may instruct the gamma generator to generate the analog voltage signals indicative of the image data.

Dither enhancement of display gamma DAC systems and methods

Systems, methods, and devices are provided for mitigating visual artifacts by dynamically tuning bias voltages applied to display pixels. An electronic display may include a display pixel and a bias voltage supply. The bias voltage supply may supply a first bias voltage to the display pixel for a first subframe of a frame of image data. The bias voltage supply may supply a different second bias voltage to the display pixel for a second subframe of the frame of image data. This may mitigate certain image artifacts, such as flicker or variable refresh rate luminance difference, that could arise due to display pixel hysteresis that varies across subframes of the image frame.

Dynamic voltage tuning to mitigate visual artifacts on an electronic display

A transceiver includes a receive circuit configured to receive an incoming signal and recover a reference signal at a reference frequency from the incoming signal. The incoming signal is a wireless packet. A first oscillator generates a signal at a set of predetermined frequencies. A first phase lock loop (PLL) interfaced with the first oscillator. The first PLL is configured to adjust a first oscillator frequency of the first oscillator based on an incoming frequency of the incoming signal using the reference frequency. A transmit circuit includes a second oscillator configured to generate a carrier signal at a predetermined frequency and a modulator configured to modulate data over the carrier signal at the predetermined frequency. The transmit circuit includes a second PLL interfaced with the second oscillator that sets the second oscillator to generate the carrier signal at the predetermined frequency using the reference signal. The transmit circuit transmits the modulated carrier signal.

Systems and methods for a crystal-less bluetooth low energy transceiver

A millimeter-scale Bluetooth low energy wireless transmitter is presented with a dual purpose loop antenna. The oscillator employs a high quality factor resonator formed by a printed 3.5&#xd7;3.5 mminductive loop antenna (simulated Q&#x2dc;110) and an on-chip digitally-switched capacitor array (simulated Q&#x2dc;283). The oscillator replaces the traditional voltage controlled oscillator plus power amplifier, achieving lower power consumption while maintaining phase noise of &#x2212;118.5 dBc/Hz at 1 MHz offset that results in low FSK modulation error (2.1%) and low frequency drift during BLE packet transmission.

Millimeter-scale bluetooth low energy transmitter with dual purpose loop antenna

Growing community of inventors

Sunnyvale, CA, United States of America

Yao Shi