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：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。

公开(公告)号：US20140210697A1

公开(公告)日：2014-07-31

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: 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：US20190260282A1

公开(公告)日：2019-08-22

申请号：US16398505

申请日：2019-04-30

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Abby Cherian ,  Manisha Pandya

IPC: H02M1/08 ,  H02M1/42 ,  H02M1/32 ,  H02M3/335 ,  H02M1/12 ,  H02M1/44

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The converter may also include an input inductor that receives an input voltage, presenting an improved power factor to an AC input power source and in conjunction with the switching devices boosts a rectified AC input voltage to a DC voltage bus of the converter.

公开(公告)号：US10170974B1

公开(公告)日：2019-01-01

申请号：US15718801

申请日：2017-09-28

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Abby Cherian ,  Manisha Pandya

IPC: H02M1/08 ,  H02M3/335 ,  H02M1/00

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The switching frequency may be varied as a function of output load, input voltage and/or voltage ripple on a DC bus of the converter. Switching may also be temporarily disabled responsive to a decrease in output load and re-enabled responsive to an increase in output load.

公开(公告)号：US09380672B2

公开(公告)日：2016-06-28

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: H05B33/08 ,  G09G3/34

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。