Apple Inc.

Vehbi Calayir

James E Brown

Hyunwoo Nho

Jie Won Ryu

Myungjoon Choi

Bret Rothenberg

Rungrot Kitsomboonloha

Pei-En Chang

Yao Shi

Wei Hsin Yao

Chaohao Wang

Kingsuk Brahma

Shengkui Gao

ByoungSuk Kim

Szu-Hsien Lee

Kyung Wook Kim

Hyunsoo Kim

Xiaokai Li

Kwang Soon Park

Chengrui Le

Shatam Agarwal

Peng Li

Jason N Gomez

Alex H Pai

Youchul Jeong

Johan L Piper

Jason C Hu

Amit Nayyar

Ce Zhang

Li-Xuan Chuo

Steven N Hanna

Venkataraman V Iyer

Kaikai Guo

Joshua D Goldman

Evan P Donoghue

Rodrigo Calderon Rico

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

Large sized electronic displays may include a backlight that generates light to illuminate a display panel. The backlight is divided into tiles that each includes a set of backlight elements that are driven by respective tile driver circuitry. Based on receiving brightness data and/or control signals from a backlight controller (BCON) of the backlight, the respective tile driver circuitry drives corresponding backlight elements such that the backlight elements suitably illuminate the display panel.

Tile passive matrix for display backlight systems

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

A method and light-emitting diode (LED) device configured to compensate for crosstalk between rows of the LED device.

Row crosstalk mitigation

Embodiments presented herein relate to reducing visual artifacts on an electronic display caused by an intra-frame pause. To do so, the intra-frame pause may be divided into smaller intra-frame pause segments. The intra-frame pause segments may be applied to the display during different image frames and/or at different locations on the electronic display. For example, each intra-frame pause segment may be applied to a different location on the electronic display. In some embodiments, multiple intra-frame pause segments may be applied during a single image frame. In some embodiments, the intra-frame pause segments may be applied to various image frames and at various location on the electronic display according to a pattern. To reduce band flickering that may be caused by the different locations of the intra-frame pause segments, an emission duty of one or more rows of pixels of the display may be adjusted.

Mitigation of tearing from intra-frame pause

Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may include feedforward control and a feedback control for a power supply for the light-emitting diodes. The feedforward control may include host circuitry for the device that determines a maximum zone current, a maximum row current, and the maximum row-to-row current step for an upcoming backlight frame while a current backlight frame is being executed. A headroom voltage for the upcoming backlight frame is determined based on the maximum zone current, the maximum row current, and/or the maximum row-to-row current step and provided to the power supply so that the power supply can settle at a corresponding supply voltage before the upcoming backlight frame is executed. The feedback control utilizes dynamic thresholds determined for each backlight frame to fine tune the feedforward-determined headroom voltage.

Adaptive headroom adjustment systems and methods for electronic device displays

Aspects of the subject technology relate to an electronic device with a display. The display includes a first array of light-emitting diodes of a backlight unit to generate backlight for the display with each LED including an anode and a cathode. A first switch selectively couples a power supply voltage to a common anode of the first array of LEDs to control illumination of the first array of LEDs. A first discharge switch selectively couples a first voltage level to the common anode of the first array of LEDs to discharge the common anode to prevent an undesired current path through the first array of LEDs and associated undesired illumination.

Display backlighting systems with cancellation architecture for canceling ghosting phenomena

Aspects of the subject technology relate to an electronic device with a display. The display includes an array of light-emitting diodes. The array includes a plurality of subarrays of the light-emitting diodes. At least one driver circuit is coupled to the array of light-emitting diodes. The at least one driver circuit is configured to generate an adaptive pulse-width modulated (PWM) signal to control at least one subarray of the plurality of subarrays of the light-emitting diodes. The adaptive PWM signal is designed with each pulse of a group having a pulse width W, each pulse width being reduced until reaching a threshold pulse width, and one pulse being removed from the group of pulses.

Display backlighting systems and methods for adaptive pulse width modulation and modulo pulse width modulation

Aspects of the subject technology relate to control circuitry for light-emitting diodes (LEDs). The control circuitry may include an LED timing controller integrated circuit configured to operate groups of rows of the LEDs with a common randomized row order that mitigates acoustic noise. The LEDs may be implemented in a backlight of a liquid crystal display and the common randomized row order that mitigates acoustic noise may be generated and/or executed to synchronize the LED operation with the operation of the pixels of the liquid crystal display.

Backlight noise reduction systems and methods for electronic device displays

Aspects of the subject technology relate to control circuitry for light-emitting diodes (LEDs). The control circuitry may include an LED timing controller integrated circuit configured to receive data from host circuitry for an electronic device, an LED row driver integrated circuit, the LED row driver integrated circuit configured to connect a high voltage power rail to the light-emitting diodes via plurality of switches, and LED column driver integrated circuits each configured to adjust a current through at least one of the light-emitting diodes.

Backlight systems and methods for electronic device displays

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San Jose, CA, United States of America

Vehbi Calayir