公开(公告)号：US20250111822A1

公开(公告)日：2025-04-03

申请号：US18897108

申请日：2024-09-26

Applicant: Apple Inc.

Inventor： Clarisse MAZUIR ,  Daamun MOHSENI ,  Christopher P. FOSS ,  Kurt R. STIEHL ,  Lynne DEVINE ,  Jonathan P. IVE ,  Matthew J. ALLEN ,  Kevin M. LYNCH ,  Alan C. DYE ,  Xiaofeng TANG ,  Daniel DE ROCHA ROSARIO ,  Ronak J. SHAH ,  Tom HSU ,  Tao ZHAN ,  Rong LIU ,  Morteza AMOOREZAEI ,  Syed Tauseen Aqeel SHAH ,  Ziruo HONG ,  Yanhui XIE ,  Yu P. SUN ,  Yong Seok CHOI

IPC: G09G3/32

Abstract: A system may include a display having a housing, a cover lens coupled to the housing, a light plate assembly in the housing, a diffuser that overlaps the light plate assembly, a louver layer that overlaps the diffuser, and a ring light source that emits additional light around the periphery of the light plate assembly and through the cover lens. The light plate assembly may include an array of light-emitting components. To improve the efficiency and contrast of the light plate assembly, reflective fill material may be formed around each light-emitting component, and absorptive fill material may surround the reflective fill material. The absorptive fill material may absorb ambient light, while the reflective fill material may redirect stray light out of the display. Dam material may surround the absorptive fill material and/or the reflective fill material.

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：US20190053337A1

公开(公告)日：2019-02-14

申请号：US15785082

申请日：2017-10-16

Applicant: Apple Inc.

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

IPC: H05B33/08 ,  G02F1/1335

CPC classification number: H05B33/083 ,  G02F1/1336 ,  G02F2001/133601 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0827 ,  H05B33/0845

Abstract: Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may include a feedforward loop and a feedback loop for a power supply for the light-emitting diodes. The light-emitting diodes may be arranged in strings that are individually controllable by a current control transistor on the string. The feedforward loop may determine a total upcoming load current for the power supply based on reference voltages for controlling each of the current control transistors. The output of the power supply may be modified based on a combination of a current from the feedforward loop and a current from the feedback loop.

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.

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.

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.

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.

公开(公告)号：US20180336843A1

公开(公告)日：2018-11-22

申请号：US15683648

申请日：2017-08-22

Applicant: Apple Inc.

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

IPC: G09G3/34 ,  H05B33/08

CPC classification number: G09G3/342 ,  G09G3/3413 ,  G09G2310/024 ,  G09G2320/064 ,  G09G2330/021 ,  G09G2330/12 ,  H05B33/0809 ,  H05B33/0824 ,  H05B33/0827 ,  H05B33/0848

Abstract: Aspects of the subject technology relate to control circuitry for operating light-emitting diodes (LEDs). The control circuitry may include a pulse-width-modulation (PWM) driver for the LEDs and headroom voltage control circuitry. The PWM driver may adjust a rising edge or a trailing edge of the PWM cycles for various LEDs to ensure a headroom voltage detection window for the headroom voltage control circuitry to sample the headroom voltage of those LEDs without being affected by the rising edge of the PWM cycle for LED or the falling edge of the PWM cycle for another LED.