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    Mitigation of battery output voltage ripple under pulse load
    1.
    发明授权
    Mitigation of battery output voltage ripple under pulse load 有权

    公开(公告)号：US11876439B2

    公开(公告)日：2024-01-16

    申请号：US17450910

    申请日：2021-10-14

    申请人： Apple Inc.

    发明人： Yanhui Xie ,  Asif Hussain ,  Jingdong Chen ,  Zhiyuan Hu

    IPC分类号： H02M1/14 ,  H02M1/00 ,  H02M3/04

    CPC分类号： H02M1/14 ,  H02M1/0077 ,  H02M3/04

    摘要： A battery powered electronic device can include a battery to power one or more loads, a first DC-DC converter having an input coupled to the battery and an output, and a second DC-DC converter cascaded with the first DC-DC converter and coupled to a second load subject to pulsed operation. The first and second converters may be configured so as to isolate the one or more loads from transients associated with the pulsed operation of the second load. The second converter may have an input coupled to the output of the first converter and an output coupled to the second load. Alternatively, the second converter may be a bidirectional converter having first terminals coupled to the output of the first converter and second terminals coupled to an energy storage device.

    LED driver headroom voltage control systems and methods
    3.
    发明授权
    LED driver headroom voltage control systems and methods 有权

    公开(公告)号：US10269307B2

    公开(公告)日：2019-04-23

    申请号：US15683648

    申请日：2017-08-22

    申请人： Apple Inc.

    发明人： Yanhui Xie ,  Asif Hussain ,  Jingdong Chen ,  Mohammad J. Navabi-Shirazi

    IPC分类号： G09G3/34 ,  H05B33/08

    摘要： Aspects of the subject technology relate to control circuitry for operating light-emitting diodes (LEDs). The control circuitry may include a pulse-width-modulation (PWM) driver for the LEDs and headroom voltage control circuitry. The PWM driver may adjust a rising edge or a trailing edge of the PWM cycles for various LEDs to ensure a headroom voltage detection window for the headroom voltage control circuitry to sample the headroom voltage of those LEDs without being affected by the rising edge of the PWM cycle for LED or the falling edge of the PWM cycle for another LED.

    Redundant operation of a backlight unit of a display device under a shorted LED condition
    6.
    发明授权
    Redundant operation of a backlight unit of a display device under a shorted LED condition 有权
    在短路LED状态下冗余操作显示设备的背光单元

    公开(公告)号：US09076357B2

    公开(公告)日：2015-07-07

    申请号：US13679745

    申请日：2012-11-16

    申请人： APPLE INC.

    发明人： Asif Hussain ,  Manisha P. Pandya

    IPC分类号： G09G3/36 ,  G09G5/00 ,  H05B33/08 ,  G09G3/34

    CPC分类号： G09G5/00 ,  G09G3/3406 ,  G09G2300/0426 ,  G09G2310/0264 ,  G09G2330/04 ,  G09G2330/08 ,  H05B33/0827 ,  H05B33/0893

    摘要： Disclosed embodiments relate to techniques for operating a backlight unit of a display device in a redundant mode and a non-redundant mode in the event of a shorted LED failure condition. For instance, in a redundant mode, multiple LED strings arranged in an end-to-end configuration are each driven to provide a first quantity of light, such that the combined output from all LED strings is capable of providing a total light output corresponding to a maximum brightness setting for the display device. In the case that an LED on one of the strings fails due to a shorted LED failure condition, the remaining functional LEDs of the affected string may be driven to provide a second quantity of light, such that the combined output from the affected strings and the non-affected strings may still provide the same total light output for achieving the maximum brightness setting. The second quantity of light is greater than the first quantity.

    摘要翻译： 公开的实施例涉及在LED短路故障情况下以冗余模式和非冗余模式操作显示装置的背光单元的技术。 例如，在冗余模式中，以端对端配置布置的多个LED串每个被驱动以提供第一数量的光，使得来自所有LED串的组合输出能够提供对应于 显示设备的最大亮度设置。 在由于LED故障条件短路引起的一个串中的LED发生故障的情况下，可以驱动受影响的串的剩余功能LED以提供第二数量的光，使得来自受影响的串和 不受影响的字符串可能仍然提供相同的总光输出以实现最大亮度设置。 第二光量大于第一数量。

    REDUNDANT OPERATION OF A BACKLIGHT UNIT OF A DISPLAY DEVICE UNDER OPEN CIRCUIT OR SHORT CIRCUIT LED STRING CONDITIONS
    7.
    发明申请
    REDUNDANT OPERATION OF A BACKLIGHT UNIT OF A DISPLAY DEVICE UNDER OPEN CIRCUIT OR SHORT CIRCUIT LED STRING CONDITIONS 有权
    打开电路或短路电路下的显示设备的背光单元的冗余操作LED条件

    公开(公告)号：US20140139498A1

    公开(公告)日：2014-05-22

    申请号：US13679728

    申请日：2012-11-16

    申请人： APPLE INC.

    发明人： Asif Hussain ,  Manisha P. Pandya

    IPC分类号： H05B37/03 ,  G09G5/00 ,  H01J9/00

    CPC分类号： H05B37/036 ,  G09G3/342 ,  G09G5/00 ,  G09G2320/064 ,  G09G2330/08 ,  G09G2330/12 ,  H05B33/08 ,  H05B33/0815 ,  H05B33/0827

    摘要： Disclosed embodiments relate to techniques for operating a backlight unit of a display device in a redundant mode and a non-redundant mode in the event of an open circuit condition or short string condition. For instance, in a redundant mode, multiple LED strings are driven to provide a first quantity of light, such that the combined output from all LED strings is capable of providing a total light output corresponding to a maximum brightness setting for the display device. In the case that one of the LED strings fails due to an open circuit condition or short string condition, the remaining LED strings may be driven to provide a second quantity of light that is greater than the first, such that the combined light output from the remaining LED strings provides the same total light output for achieving the maximum brightness setting.

    摘要翻译： 公开的实施例涉及在开路状况或短串条件的情况下以冗余模式和非冗余模式操作显示装置的背光单元的技术。 例如，在冗余模式中，多个LED串被驱动以提供第一数量的光，使得来自所有LED串的组合输出能够提供对应于显示装置的最大亮度设置的总光输出。 在LED串中的一个由于开路条件或短串条件而失效的情况下，可以驱动剩余的LED串以提供大于第一数量的第二量的光，使得从 剩余的LED串提供相同的总光输出以实现最大亮度设置。

    Current Load Transient Mitigation in Display Backlight Driver
    8.
    发明申请
    Current Load Transient Mitigation in Display Backlight Driver 有权

    公开(公告)号：US20230085621A1

    公开(公告)日：2023-03-23

    申请号：US17853247

    申请日：2022-06-29

    申请人： Apple Inc.

    发明人： Behzad Mohtashemi ,  Asif Hussain ,  Feng Guo ,  Jingdong Chen ,  Ming Gu ,  Mohammad J. Navabi-Shirazi ,  Omar Alnaggar ,  Venkataraman V. Iyer ,  Yang Zhang

    IPC分类号： G09G3/20

    摘要： A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.