公开(公告)号：US10075095B2

公开(公告)日：2018-09-11

申请号：US15148245

申请日：2016-05-06

Applicant: Apple Inc.

Inventor： Asif Hussain ,  Behzad Mohtashemi ,  Manisha P. Pandya ,  Mohammad J. Navabi-Shirazi

IPC: H02M7/44 ,  H02M7/537 ,  H02M1/08 ,  H02M3/158 ,  H02M1/00

CPC classification number: H02M7/537 ,  H02M1/08 ,  H02M3/158 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1425 ,  Y02B70/1483 ,  Y02B70/1491

Abstract: Various systems, apparatuses, and methods are disclosed herein, which provide a new power conversion topology for isolated systems that does not include a transformer. Embodiments of the inventive systems comprise: a switching system utilizing high voltage, low leakage switches, e.g., Silicon Carbide (SiC) MOS-FETs; a power source; an inductor and a capacitor operating as a link stage resonant LC circuit; and a load. The switching system may be configured to be controlled in a synchronized ‘four phase’ control loop process, wherein the input switches are prevented from being closed at the same time as the output switches, thereby providing electrical isolation between the input power source and the load—without the use of a transformer. The techniques disclosed herein are applicable to any number of isolated systems that supply power to electronic systems such as: digital cameras, mobile phones, watches, personal data assistants (PDAs), portable music players, displays, and computers.

公开(公告)号：US10063155B2

公开(公告)日：2018-08-28

申请号：US15148870

申请日：2016-05-06

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Asif Hussain ,  Manisha P. Pandya ,  Mohammad J. Navabi-Shirazi ,  Nileshbhai J. Shah

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/0009

Abstract: Various systems and methods are disclosed herein, which provide isolated systems with an auxiliary, multi-signal digital feedback loop for reporting a plurality of different potential fault conditions in an output system (e.g., output short circuit, output over-voltage, output under-voltage, output over temperature, etc.) to a Primary Controller in an input system. The signals may be sent according to any desired standardized (or proprietary) data transmission protocols. Use of a digital feedback loop allows the signals to be passed to the Primary Controller more quickly than is allowed by traditional analog feedback paths—and while using only a single optocoupler device for the transmission of all fault conditions. The techniques disclosed herein are applicable to any number of isolated systems that supply power to electronic systems such as: digital cameras, mobile phones, watches, personal data assistants (PDAs), portable music players, monitors, as well as desktop, laptop, and tablet computers.

公开(公告)号：US20180218859A1

公开(公告)日：2018-08-02

申请号：US15939123

申请日：2018-03-28

Applicant: Apple Inc.

Inventor： Christiaan A. Ligtenberg ,  Brett W. Degner ,  Ron A. Hopkinson ,  Asif Hussain ,  Dinesh C. Mathew ,  Mikael M. Silvanto ,  Chang Zhang ,  Zheng Gao ,  Robert Y. Cao

IPC: H01H13/705 ,  H01H13/703 ,  H03K17/96

CPC classification number: G06F3/016 ,  G06F1/1616 ,  G06F1/165 ,  G06F1/1662 ,  G06F1/169 ,  G06F1/266 ,  G06F3/017 ,  G06F3/0213 ,  G06F3/0216 ,  G06F3/03547 ,  G06F3/0412 ,  G06F3/0414 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/0488 ,  G06F3/04886 ,  G06F2203/04102 ,  G06F2203/04105 ,  G06F2203/04106 ,  G06K9/00375 ,  H01H3/125 ,  H01H13/703 ,  H01H13/705 ,  H01H13/785 ,  H01H13/85 ,  H01H13/86 ,  H01H2201/036 ,  H01H2215/05 ,  H01H2215/052 ,  H01H2219/002 ,  H01H2219/004 ,  H01H2219/046 ,  H01H2219/056 ,  H01H2223/002 ,  H01L41/09 ,  H03K17/943 ,  H03K17/9622 ,  H03K17/9643 ,  H03K17/9647 ,  H03K17/98 ,  H03K2217/94089 ,  H03K2217/96003 ,  H03K2217/9653

Abstract: A portable computer includes a display portion comprising a display, a base portion pivotally coupled to the display portion and including a glass top case. The glass top case defines an exterior surface and a keyboard opening through the glass top case from the exterior surface to an interior surface. The portable computer further includes a keyboard positioned at least partially within the keyboard opening and comprising a substrate, a key configured to move relative to the substrate, and a fabric cover disposed over the key and defining a user interface surface of the key.

公开(公告)号：US09826596B2

公开(公告)日：2017-11-21

申请号：US13679781

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya ,  Adrian E. Sun

IPC: H05B37/00 ,  H05B37/02 ,  H05B33/08 ,  G09G3/34

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.

公开(公告)号：US09345083B2

公开(公告)日：2016-05-17

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: H05B37/02 ,  H05B33/08 ,  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 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模式通过使用设计用于根据脉冲信号的频率如何随时间而变化的脉冲信号的频率而设计的控制电路来实施可听频率阈值。 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。

公开(公告)号：US09271379B2

公开(公告)日：2016-02-23

申请号：US13679728

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: G09G3/36 ,  H05B37/03 ,  G09G5/00 ,  G09G3/34 ,  H05B33/08

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

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.

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。

公开(公告)号：US08976092B2

公开(公告)日：2015-03-10

申请号：US13756259

申请日：2013-01-31

Applicant: Apple Inc.

Inventor： Asif Hussain ,  Jingdong Chen ,  Mohammad Jafar Navabi-Shirazi ,  Manisha Pandya ,  Alejandro L. Ascorra

IPC: G09G3/34 ,  G09G3/36 ,  G09G5/10

CPC classification number: G09G5/10 ,  G09G3/3406 ,  G09G2320/0261 ,  G09G2320/064 ,  G09G2320/0646 ,  G09G2320/10 ,  G09G2330/021 ,  G09G2354/00 ,  G09G2360/144 ,  G09G2360/16

Abstract: A system may include a processor, a graphics controller, and a display. The graphics controller may generate video data to be presented on the display. The display may include a display panel, a backlight unit for providing the display panel with backlight, and a display timing controller for communicating with the graphics controller. The display may be used in non-movie mode and movie mode. The backlight unit may be operated in fixed backlight mode during the non-movie display mode and may be operated in dynamic pixel backlight (DPB) mode during the movie display mode. Backlight level adjustments may be sloped only during the non-movie mode. Backlight level sloping can be handled internally within the backlight unit, can be controlled using pulse width modulation with the display timing controller, and implemented using incremental backlight level adjustments with the processor.

Abstract translation: 系统可以包括处理器，图形控制器和显示器。 图形控制器可以生成要呈现在显示器上的视频数据。 显示器可以包括显示面板，用于向显示面板提供背光的背光单元，以及用于与图形控制器通信的显示定时控制器。 显示器可以用于非电影模式和短片模式。 背光单元可以在非电影显示模式期间以固定背光模式操作，并且可以在动画显示模式期间以动态像素背光（DPB）模式操作。 仅在非电影模式期间，背光级别调整可能会倾斜。 背光水平倾斜可以在背光单元内部处理，可以使用显示定时控制器的脉冲宽度调制进行控制，并使用处理器进行增量背光级调整。

公开(公告)号：US20140139499A1

公开(公告)日：2014-05-22

申请号：US13679745

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: H05B33/08 ,  G09G5/00

CPC classification number: G09G5/00 ,  G09G3/3406 ,  G09G2300/0426 ,  G09G2310/0264 ,  G09G2330/04 ,  G09G2330/08 ,  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 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.

Abstract translation: 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。