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    Tile Passive Matrix for Display Backlight Systems
    2.
    发明公开
    Tile Passive Matrix for Display Backlight Systems 审中-公开

    公开(公告)号：US20230186865A1

    公开(公告)日：2023-06-15

    申请号：US17980252

    申请日：2022-11-03

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  Youchul Jeong ,  Joshua D. Goldman

    IPC: G09G3/34

    CPC classification number: G09G3/3426 ,  G09G2360/145 ,  G09G2320/0626

    Abstract: 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.

    Adaptive headroom adjustment systems and methods for electronic device displays
    5.
    发明授权
    Adaptive headroom adjustment systems and methods for electronic device displays 有权

    公开(公告)号：US11468854B2

    公开(公告)日：2022-10-11

    申请号：US16510635

    申请日：2019-07-12

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  James E. Brown

    IPC: G09G3/34 ,  G09G5/10 ,  G09G3/282

    Abstract: 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.

    Backlight noise reduction systems and methods for electronic device displays
    6.
    发明授权
    Backlight noise reduction systems and methods for electronic device displays 有权

    公开(公告)号：US11107424B2

    公开(公告)日：2021-08-31

    申请号：US16521332

    申请日：2019-07-24

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  James E. Brown

    IPC: G09G3/34 ,  G09G3/36

    Abstract: 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.

    REDUCED POWER DISPLAY POWER MANAGEMENT INTEGRATED CIRCUIT
    7.
    发明申请
    REDUCED POWER DISPLAY POWER MANAGEMENT INTEGRATED CIRCUIT 有权

    公开(公告)号：US20250095540A1

    公开(公告)日：2025-03-20

    申请号：US18815162

    申请日：2024-08-26

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  Weimin Zhang ,  Bret Rothenberg ,  Zhongyuan Ren ,  Fenghua Zheng ,  Mohammad Reza Esmaeili Rad

    IPC: G09G3/20

    Abstract: A power management integrated circuit (PMIC) of an electronic display may include image data reference voltage adjustment circuitry, a negative supply voltage generator that may generate a negative supply voltage with multiple negative supply voltages, and/or a dedicated timing controller. The image data reference voltage adjustment circuitry may tune image data reference voltages for generating programming voltages based on receiving an indication of an undesired direct current (DC) voltage offset, an undesired alternating current (AC) noise, or both. The image data reference voltage adjustment circuitry may receive the indication from a display panel of the electronic display. The negative supply voltage generator may elevate a voltage of the negative supply voltage to reduce a power consumption of the electronic display. The dedicated timing controller may improve (e.g., reduce length of) a frequency range of one or more switched voltages of the PMIC to reduce front of screen artifacts.

    Display backlighting systems and methods for adaptive pulse width modulation and modulo pulse width modulation
    9.
    发明授权
    Display backlighting systems and methods for adaptive pulse width modulation and modulo pulse width modulation 有权

    公开(公告)号：US11145260B2

    公开(公告)日：2021-10-12

    申请号：US16836617

    申请日：2020-03-31

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  James E. Brown ,  Venkataraman V. Iyer ,  Bret Rothenberg

    IPC: G09G3/36 ,  G09G3/34

    Abstract: 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 WITH CANCELLATION ARCHITECTURE FOR CANCELING GHOSTING PHENOMENA
    10.
    发明申请
    DISPLAY BACKLIGHTING SYSTEMS WITH CANCELLATION ARCHITECTURE FOR CANCELING GHOSTING PHENOMENA 有权

    公开(公告)号：US20210018795A1

    公开(公告)日：2021-01-21

    申请号：US16897100

    申请日：2020-06-09

    Applicant: Apple Inc.

    Inventor： Vehbi Calayir ,  James E. Brown ,  Bret Rothenberg

    IPC: G02F1/13357 ,  H05B45/325 ,  H05B45/3725 ,  H05B45/10

    Abstract: 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.

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