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。

公开(公告)号：US20190059136A1

公开(公告)日：2019-02-21

申请号：US15784943

申请日：2017-10-16

Applicant: Apple Inc.

Inventor： Mohammad J. NAVABI-SHIRAZI ,  Alejandro Lara ASCORRA ,  Asif HUSSAIN ,  Ji Yeoul RYOO ,  Jingdong CHEN ,  Jun QI ,  Manisha P. PANDYA ,  Yanhui XIE

IPC: H05B33/08

Abstract: Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may operate a light-emitting diode using a multi-peak pulse-width-modulation signal. The control circuitry may include a multi-stage driver having a relatively larger driver stage for providing a direct current through a light-emitting diode and a relatively smaller driver stage configured to cooperate with a pulse-width-modulation controller to pulse-width-modulate a current through the light-emitting diode.

公开(公告)号：US20130278170A1

公开(公告)日：2013-10-24

申请号：US13659885

申请日：2012-10-24

Applicant: APPLE INC.

Inventor： Alejandro Lara ASCORRA ,  Brad Lee Patton ,  Shimon Elkayam

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。