公开(公告)号：US11694641B2

公开(公告)日：2023-07-04

申请号：US17870576

申请日：2022-07-21

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Mohammad J Navabi-Shirazi ,  Feng Guo ,  Omar Alnaggar ,  Venkataraman V Iyer ,  Jingdong Chen ,  Yang Zhang ,  Ming Gu ,  Asif Hussain

IPC: G09G3/34

CPC classification number: G09G3/3406 ,  G09G2310/08 ,  G09G2320/064

Abstract: Systems and methods for preserving a pulse width modulation (PWM) resolution while increasing the frequency of a pulse width modulation (PWM) clock are provided. An electronic display backlight system may include a backlight element and backlight dimming circuitry. The backlight element may be driven according to a pulse width modulation (PWM) signal over a PWM clock cycle equal to a multiple M of a baseline PWM clock frequency associated with a baseline PWM resolution. The backlight dimming circuitry may receive a brightness code of the baseline PWM resolution and generate the PWM signal at least in part by dividing the brightness code by M.

公开(公告)号：US20230085621A1

公开(公告)日：2023-03-23

申请号：US17853247

申请日：2022-06-29

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Asif Hussain ,  Feng Guo ,  Jingdong Chen ,  Ming Gu ,  Mohammad J. Navabi-Shirazi ,  Omar Alnaggar ,  Venkataraman V. Iyer ,  Yang Zhang

IPC: G09G3/20

Abstract: A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.

公开(公告)号：US11823612B2

公开(公告)日：2023-11-21

申请号：US17853247

申请日：2022-06-29

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Asif Hussain ,  Feng Guo ,  Jingdong Chen ,  Ming Gu ,  Mohammad J Navabi-Shirazi ,  Omar Alnaggar ,  Venkataraman V Iyer ,  Yang Zhang

IPC: G09G3/20

CPC classification number: G09G3/2092 ,  G09G2310/0264 ,  G09G2310/08

Abstract: A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.

公开(公告)号：US20230100812A1

公开(公告)日：2023-03-30

申请号：US17870576

申请日：2022-07-21

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Mohammad J Navabi-Shirazi ,  Feng Guo ,  Omar Alnaggar ,  Venkataraman V Iyer ,  Jingdong Chen ,  Yang Zhang ,  Ming Gu ,  Asif Hussain

IPC: G09G3/34

Abstract: Systems and methods for preserving a pulse width modulation (PWM) resolution while increasing the frequency of a pulse width modulation (PWM) clock are provided. An electronic display backlight system may include a backlight element and backlight dimming circuitry. The backlight element may be driven according to a pulse width modulation (PWM) signal over a PWM clock cycle equal to a multiple M of a baseline PWM clock frequency associated with a baseline PWM resolution. The backlight dimming circuitry may receive a brightness code of the baseline PWM resolution and generate the PWM signal at least in part by dividing the brightness code by M.