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    BACKLIGHT DRIVER CHIP INCORPORATING A PHASE LOCK LOOP (PLL) WITH PROGRAMMABLE OFFSET/DELAY AND SEAMLESS OPERATION
    1.
    发明申请
    BACKLIGHT DRIVER CHIP INCORPORATING A PHASE LOCK LOOP (PLL) WITH PROGRAMMABLE OFFSET/DELAY AND SEAMLESS OPERATION 有权
    背光驱动器芯片可编程相位锁定环（PLL），具有可编程偏移/延迟和无缝操作

    公开(公告)号：US20150116380A1

    公开(公告)日：2015-04-30

    申请号：US14502945

    申请日：2014-09-30

    Applicant: Apple Inc.

    Inventor： Asif HUSSAIN ,  Andrew P. AITKEN ,  Manisha P. PANDYA

    IPC: G09G3/34

    CPC classification number: H05B33/0815 ,  G09G3/3406 ,  G09G3/342 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/064 ,  Y02B20/346

    Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for synchronizing a pulse width modulation (PWM) dimming clock signal with a frame rate signal, line sync signal, and/or a horizontal sync signal of a display device. The PWM dimming clock signal can be generated by a synchronization block having a programmable offset/delay. The programmable offset/delay can control the offset or phase difference between an input and an output clock signal of the synchronization block. Depending on the clock rate of PWM dimming and/or panel resolution, the phase/offset delay can be adjusted to achieve the optimum front of screen performance. Additionally, an input clock generator/missing pulse detection block can output a programmed clock signal to the synchronization block in case of a missing external clock, or insert a pulse when there is a missing pulse detected, thereby providing an un-interrupted input clock signal to the PWM generator.

    Abstract translation: 本文讨论的实施例涉及用于使脉宽调制（PWM）调光时钟信号与显示设备的帧速率信号，行同步信号和/或水平同步信号同步的系统，方法和装置。 PWM调光时钟信号可以由具有可编程偏移/延迟的同步块产生。 可编程偏移/延迟可以控制同步块的输入和输出时钟信号之间的偏移或相位差。 根据PWM调光和/或面板分辨率的时钟频率，可以调整相位/偏移延迟，以实现屏幕性能的最佳化。 此外，在缺少外部时钟的情况下，输入时钟发生器/丢失脉冲检测块可以将编程的时钟信号输出到同步块，或者当检测到缺失脉冲时插入脉冲，从而提供未中断的输入时钟信号 到PWM发生器。

    LED DRIVER GATE CLAMP SYSTEMS AND METHODS
    4.
    发明申请
    LED DRIVER GATE CLAMP SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20180332678A1

    公开(公告)日：2018-11-15

    申请号：US15691672

    申请日：2017-08-30

    Applicant: Apple Inc.

    Inventor： Mohammad J. NAVABI-SHIRAZI ,  Jingdong CHEN ,  Asif HUSSAIN ,  Yanhui XIE

    IPC: H05B33/08

    CPC classification number: H05B33/0824 ,  H05B33/0845

    Abstract: Aspects of the subject technology relate to display circuitry such as backlight control circuitry for operating light-emitting diodes (LEDs). The backlight control circuitry may include a pulse-width-modulation (PWM) transistor and a current regulation transistor coupled in series with at least one LED. The current regulation transistor may have a gate terminal that receives a feedback-controlled gate voltage. The backlight control circuitry may include a gate clamp circuit coupled to the gate terminal of the current regulation transistor that clamps the gate voltage during a portion of a PWM on pulse.

    MULTIPLE BACKLIGHT KEYBOARD
    5.
    发明申请
    MULTIPLE BACKLIGHT KEYBOARD 审中-公开
    多功能背光键盘

    公开(公告)号：US20150334799A1

    公开(公告)日：2015-11-19

    申请号：US14279191

    申请日：2014-05-15

    Applicant: Apple Inc.

    Inventor： Alejandro Lara ASCORRA ,  Adam I. PAPAMARCOS ,  Asif HUSSAIN ,  Mohammad J. NAVABI-SHIRAZI ,  Keith J. HENDREN ,  Thai Q. LA

    IPC: H05B33/08 ,  H01H13/83

    CPC classification number: H05B33/0845 ,  G06F1/1662 ,  H01H13/83 ,  H01H2219/039 ,  H05B33/0863

    Abstract: This application relates to a dynamic lighting circuit for a keyboard of a computing device. The lighting circuit described herein includes several light emitting diode (LED) drivers having multiple channels for controlling multiple LEDs. The lighting circuit also includes an electrically erasable read-only memory (EEPROM) for storing configuration data for the LED drivers. Each LED is configured to individually illuminate a single key of the keyboard, allowing the lighting circuit to modify the brightness of each key without affecting the brightness of other keys. In this way, more lighting schemes are available for the keyboard, while also providing a thinner mechanical design for the keyboard. Lighting schemes can include illuminating a group or groups of keys at a different brightness level than other keys that are not contained in the group. Additionally, lighting schemes can include animations executed by varying the brightness levels of keys over a period of time.

    Abstract translation: 本申请涉及用于计算设备的键盘的动态照明电路。 本文描述的照明电路包括具有用于控制多个LED的多个通道的几个发光二极管（LED）驱动器。 照明电路还包括用于存储LED驱动器的配置数据的电可擦除只读存储器（EEPROM）。 每个LED被配置为单独地照亮键盘的单个键，允许照明电路修改每个键的亮度而不影响其他键的亮度。 以这种方式，更多的照明方案可用于键盘，同时还为键盘提供更薄的机械设计。 照明方案可以包括以与组中不包含的其他键不同的亮度级别照亮一组或多组键。 此外，照明方案可以包括通过在一段时间内改变键的亮度水平而执行的动画。

    BOOST CONVERTER WITH A PULSE FREQUENCY MODULATION MODE FOR OPERATING ABOVE AN AUDIBLE FREQUENCY
    6.
    发明申请
    BOOST CONVERTER WITH A PULSE FREQUENCY MODULATION MODE FOR OPERATING ABOVE AN AUDIBLE FREQUENCY 有权
    具有脉冲频率调制模式的升压转换器，可操作在可调谐频率上

    公开(公告)号：US20150115813A1

    公开(公告)日：2015-04-30

    申请号：US14503037

    申请日：2014-09-30

    Applicant: Apple Inc.

    Inventor： Asif HUSSAIN ,  Behzad MOHTASHEMI ,  Mohammad J. NAVABI-SHIRAZI ,  Jingdong CHEN ,  Manisha P. PANDYA

    IPC: H05B33/08

    CPC classification number: H05B33/0815 ,  G09G3/3406 ,  G09G3/342 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/064 ,  Y02B20/346

    Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for executing a pulse frequency modulation (PFM) mode of a boost converter in order to ensure that a switching frequency of the boost converter is a above an audible frequency threshold. In this way, a user operating a display device that is controlled by the boost converter will not be disturbed by audible noises generated at the display device. The PFM mode enforces an audible frequency threshold by using control circuitry designed to increase or decrease the frequency of a pulse signal depending on how the frequency of the pulse signal changes over time. The control circuitry can apply an additional load to the boost converter in order to increase the frequency of the pulse signal when the frequency is approaching the audible frequency threshold.

    Abstract translation: 本文讨论的实施例涉及用于执行升压转换器的脉冲频率调制（PFM）模式的系统，方法和装置，以便确保升压转换器的开关频率高于可听频率阈值。 以这种方式，操作由升压转换器控制的显示装置的用户不会被在显示装置处产生的可听见的噪声所扰乱。 PFM模式通过使用控制电路来实施可听频率阈值，该控制电路旨在根据脉冲信号的频率如何随时间而变化来增加或减少脉冲信号的频率。 控制电路可以向升压转换器施加额外的负载，以便在频率接近可听频率阈值时增加脉冲信号的频率。

    LOCAL DISPLAY BACKLIGHTING SYSTEMS AND METHODS
    7.
    发明申请
    LOCAL DISPLAY BACKLIGHTING SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20190132915A1

    公开(公告)日：2019-05-02

    申请号：US16232913

    申请日：2018-12-26

    Applicant: Apple Inc.

    Inventor： Yanhui XIE ,  Asif HUSSAIN ,  Jingdong CHEN ,  Manisha P. PANDYA

    IPC: H05B33/08 ,  G02F1/1335

    Abstract: Aspects of the subject technology relate to display of an electronic device. The display includes a backlight unit having a voltage source, a string of light-emitting diodes and a bypass switch for each light-emitting diode in the string. The string of light-emitting diodes can receive, at a first end, a supply voltage from the voltage source. The bypass switch for each light-emitting diode is controllable to pulse-width-modulate that light-emitting diode. The headroom voltage feedback circuit is coupled to a second end of the string.

    LOCAL DISPLAY BACKLIGHTING SYSTEMS AND METHODS
    8.
    发明申请
    LOCAL DISPLAY BACKLIGHTING SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20190045591A1

    公开(公告)日：2019-02-07

    申请号：US15789885

    申请日：2017-10-20

    Applicant: Apple Inc.

    Inventor： Yanhui XIE ,  Asif HUSSAIN ,  Jingdong CHEN ,  Manisha P. PANDYA

    IPC: H05B33/08 ,  G02F1/1335

    Abstract: Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry includes a two-dimensional light-emitting diode (LED) array. The control circuitry may include a single LED array operable by a common driver or multiple LED arrays each operable by a dedicated LED matrix driver. Each matrix driver may receive a synchronization signal from a common controller and may include a programmable phase lock loop (PLL) to synchronize each matrix driver to the synchronization signal. The LED array may include multiple strings of LEDs mounted in series along the string. Each LED in each string may include a bypass switch operable to modify the current through that LED by pulse-width modulation.

    DISPLAY BACKLIGHT HEADROOM CONTROL SYSTEMS AND METHODS
    9.
    发明申请
    DISPLAY BACKLIGHT HEADROOM CONTROL SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20180373094A1

    公开(公告)日：2018-12-27

    申请号：US15711932

    申请日：2017-09-21

    Applicant: Apple Inc.

    Inventor： Ji Yeoul RYOO ,  Asif HUSSAIN ,  Jingdong CHEN ,  Mohammad J. NAVABI-SHIRAZI ,  Yanhui XIE

    IPC: G02F1/1335 ,  H05B37/02 ,  H05B33/08 ,  G09G3/34

    Abstract: Aspects of the subject technology relate to display circuitry such as backlight control circuitry for operating parallel strings of light-emitting diodes (LEDs). A voltage supply circuit of the backlight control circuitry provides a common supply voltage to the strings of LEDs. Headroom control circuitry samples a residual voltage at the end of each string, determines a minimum of the residual voltages, and provides feedback, based on the determined minimum voltage, to the voltage supply circuit. A headroom control feedback loop may be provided including sampling lines coupled to the second end of each string of LEDs for sampling a residual voltage of each string. Headroom control circuitry may modify the supply voltage based on the minimum residual voltage. Sample-and-hold circuitry may be provided that holds the sampled residual voltages until the voltage supply circuit is ready for an update.

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