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    Display backlight driver IC configuration
    31.
    发明授权
    Display backlight driver IC configuration 有权
    显示背光驱动IC配置

    公开(公告)号：US08933643B2

    公开(公告)日：2015-01-13

    申请号：US13659888

    申请日：2012-10-24

    Applicant: Apple Inc.

    Inventor： Alejandro Lara Ascorra ,  Shimon Elkayam ,  Asif Hussain ,  Brad Lee Patton ,  Steven J. Sfarzo ,  Eric G. Smith

    IPC: H05B37/02

    CPC classification number: H05B33/0842

    Abstract: One embodiment of a display backlight driver integrated circuit can be configured for operation in at least two different ways. A first method transfers data from an EEPROM to hardware registers prior to regular operation. A second method also transfers data from an EEPROM to registers. However, hardware registers can be overwritten with data accepted from a control bus, prior to regular operation. A keyboard driver IC can detect the presence or absence of a cable to an LED. If the cable is absent, the driver IC will not supply power for the LED. One embodiment of a keyboard and display backlight control system can be configured to allow substantially independent operation.

    Abstract translation: 显示器背光驱动器集成电路的一个实施例可被配置为以至少两种不同的方式进行操作。 第一种方法是在正常操作之前将数据从EEPROM传输到硬件寄存器。 第二种方法还将数据从EEPROM传输到寄存器。 但是，在正常操作之前，硬件寄存器可以被从控制总线接受的数据覆盖。 键盘驱动器IC可以检测到LED的电缆的存在或不存在。 如果电缆不存在，驱动器IC将不会为LED供电。 键盘和显示器背光控制系统的一个实施例可以被配置为允许基本独立的操作。

    REDUNDANT OPERATION OF A BACKLIGHT UNIT OF A DISPLAY DEVICE UNDER OPEN CIRCUIT OR SHORT CIRCUIT LED STRING CONDITIONS AND INCLUDING DYNAMIC PHASE SHIFTING BETWEEN LED STRINGS
    32.
    发明申请
    REDUNDANT OPERATION OF A BACKLIGHT UNIT OF A DISPLAY DEVICE UNDER OPEN CIRCUIT OR SHORT CIRCUIT LED STRING CONDITIONS AND INCLUDING DYNAMIC PHASE SHIFTING BETWEEN LED STRINGS 审中-公开
    在打开电路或短路LED条件下的显示装置的背光单元的冗余操作，并且包括LED条之间的动态相位移

    公开(公告)号：US20140247295A1

    公开(公告)日：2014-09-04

    申请号：US14276132

    申请日：2014-05-13

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Manisha P. Pandya

    IPC: G09G3/36 ,  H05B33/08

    CPC classification number: G09G3/3611 ,  G09G3/3406 ,  G09G2300/0426 ,  G09G2330/028 ,  G09G2330/06 ,  G09G2330/08 ,  G09G2340/0457 ,  H05B33/0827 ,  H05B33/0893

    Abstract: 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. Further, if the LED strings are operated in a phase-shifted manner, the phase shift between the remaining LED strings may be dynamically adjusted to keep the phase shift substantially equal between the LED strings.

    Abstract translation: 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。 此外，如果LED串以相移的方式操作，则可以动态地调整剩余LED串之间的相移，以保持LED串之间的相移基本相等。

    Methods and Apparatus for Improving Backlight Driver Efficiency
    33.
    发明申请
    Methods and Apparatus for Improving Backlight Driver Efficiency 有权
    提高背光驱动效率的方法和装置

    公开(公告)号：US20140159614A1

    公开(公告)日：2014-06-12

    申请号：US13754640

    申请日：2013-01-30

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Jingdong Chen ,  Mohammad Jafar Navabi-Shirazi ,  Manisha Pandya

    IPC: H05B37/02

    CPC classification number: H05B33/086 ,  G09G3/3406 ,  G09G2320/041 ,  G09G2320/062 ,  G09G2320/064 ,  H05B33/0863

    Abstract: An electronic device may be provided with display circuitry that includes a display timing controller, a backlight driver, a light source, and other associated backlight structures. The backlight control circuitry may generate a control signal having an adjustable duty cycle to the backlight driver. The backlight driver may include a boost converter, a current driver, and backlight control circuitry. The current driver may only be activated when the control signal is high. The backlight control circuitry may output an enable signal to the boost converter. The backlight control circuitry may activate the boost converter a predetermined amount of time before each rising clock edge in the control signal by asserting the enable signal for a longer period of time than when the control signal is high. The control signal and the enable signal may be deasserted at around the same times.

    Abstract translation: 电子设备可以设置有显示电路，显示电路包括显示定时控制器，背光驱动器，光源和其它相关联的背光结构。 背光控制电路可以产生对背光驱动器具有可调占空比的控制信号。 背光驱动器可以包括升压转换器，电流驱动器和背光控制电路。 当控制信号为高电平时，只能激活当前驱动器。 背光控制电路可以向升压转换器输出使能信号。 背光控制电路可以在控制信号中的每个上升时钟沿之前的预定时间量内激活升压转换器，该时间长于当控制信号为高时，将使能信号置为更长的时间段。 控制信号和使能信号可以在大约相同的时间被解除。

    DEVICES AND METHODS FOR CONTROLLING BRIGHTNESS OF A DISPLAY BACKLIGHT
    34.
    发明申请
    DEVICES AND METHODS FOR CONTROLLING BRIGHTNESS OF A DISPLAY BACKLIGHT 有权
    用于控制显示器背光亮度的装置和方法

    公开(公告)号：US20140097765A1

    公开(公告)日：2014-04-10

    申请号：US13679781

    申请日：2012-11-16

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya

    IPC: H05B37/02

    CPC classification number: H05B37/02 ,  G09G3/3426 ,  H05B33/0869

    Abstract: Devices and methods for controlling brightness of a display backlight are provided. A display backlight controller may control the brightness of the display backlight by changing a duty cycle of a PWM signal that drives the LED current. However, because of LED efficacy and response time, the final output brightness (NITS) may not be linear between 0% to 100%. The disclosed methods may be used to correct the brightness using a predetermined correction factor. Further, the minimum and maximum duty cycle of the output dimming duty cycle may be limited or corrected. In one example, a backlight controller receives an input duty cycle and determines a product of the input duty cycle and a maximum duty cycle to produce a reduced duty cycle. Moreover, the backlight driver may determine a corrected duty cycle using the correction factor. The final output duty cycle and LED current may then be determined.

    Abstract translation: 提供了用于控制显示器背光的亮度的装置和方法。 显示器背光控制器可以通过改变驱动LED电流的PWM信号的占空比来控制显示器背光的亮度。 然而，由于LED效能和响应时间，最终的输出亮度（NITS）可能在0％到100％之间不是线性的。 所公开的方法可以用于使用预定的校正因子校正亮度。 此外，可以限制或校正输出调光占空比的最小和最大占空比。 在一个示例中，背光控制器接收输入占空比并且确定输入占空比和最大占空比的乘积以产生减小的占空比。 此外，背光驱动器可以使用校正因子来确定校正的占空比。 然后可以确定最终的输出占空比和LED电流。

    PHASE-SHIFTING A SYNCHRONIZATION SIGNAL TO REDUCE ELECTROMAGNETIC INTERFERENCE
    35.
    发明申请
    PHASE-SHIFTING A SYNCHRONIZATION SIGNAL TO REDUCE ELECTROMAGNETIC INTERFERENCE 有权
    相位改变同步信号以减少电磁干扰

    公开(公告)号：US20130242621A1

    公开(公告)日：2013-09-19

    申请号：US13705476

    申请日：2012-12-05

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Nicholas A. Sims

    IPC: H02M3/335

    CPC classification number: H02M3/33507 ,  H02M1/44 ,  H02M3/1584 ,  H02M3/285 ,  H02M3/33515 ,  H02M3/33561 ,  H02M2001/007 ,  H02M2001/008 ,  H02M2001/009

    Abstract: A power supply with reduced electromagnetic interference (EMI) is described. This power supply includes cascaded stages with switched-mode power-supply circuits that are switched synchronously during operation by switching signals that have a common fundamental frequency. EMI associated with the power supply is reduced by establishing a phase shift between the switching signals in at least two of the stages.

    Abstract translation: 描述了具有降低的电磁干扰（EMI）的电源。 该电源包括级联级，其中开关模式电源电路在操作期间通过切换具有共同基频的信号同步地切换。 通过在至少两个级中的开关信号之间建立相移来减小与电源相关联的EMI。

    Inductive flying capacitor converters and control techniques therefor
    37.
    发明授权
    Inductive flying capacitor converters and control techniques therefor 有权

    公开(公告)号：US11689094B2

    公开(公告)日：2023-06-27

    申请号：US17324307

    申请日：2021-05-19

    Applicant: Apple Inc.

    Inventor： Zhiyuan Hu ,  Jingdong Chen ,  Yanhui Xie ,  Asif Hussain

    IPC: H02M3/07 ,  H02M1/00 ,  H02M7/483

    CPC classification number: H02M1/0095 ,  H02M3/07 ,  H02M7/4837

    Abstract: Power converters can include a plurality of switching devices and a combination of one or more inductors and one or more flying capacitors. Both boost and buck converters may employ such topologies, and can achieve high efficiency and small size in at least some applications, including those with high conversion ratios. A control circuit can generate a first pair of complementary gate drive signals to drive a first complementary switch pairs and a second pair of complementary gate drive signals to drive a second complementary switch pair. The control circuit can vary a phase shift between the first pair of complementary gate drive signals and the second pair of complementary gate drive signals to regulate the flying capacitor voltage.

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