公开(公告)号：US11022840B2

公开(公告)日：2021-06-01

申请号：US16409567

申请日：2019-05-10

Applicant: Apple Inc.

Inventor： Rong Liu ,  Yu P. Sun ,  Abdeslam Hafidi ,  Erik A. Zweigle ,  Jun Qi ,  Mingxia Gu ,  Victor H. Yin ,  Xiangtong Li ,  Yanming Li ,  Yi Huang ,  Ziruo Hong

IPC: G02F1/1335 ,  G02F1/13357

Abstract: An array of pixels in a display may be illuminated by a backlight having an array of light-emitting diodes in an array of respective cells. A reflector is used to reflect light from the light-emitting diodes through the array of pixels. Within the cells, the reflector has cross-sectional profiles that help distribute light emitted from the light-emitting diodes toward edges of the cells. A light diffuser layer for the backlight may have a partially reflective layer such as a thin-film interference filter with an angularly dependent transmission. Within each cell, the reflector may have cross-sectional profiles with portions that are parabolic or elliptical.

公开(公告)号：US20170371087A1

公开(公告)日：2017-12-28

申请号：US15260904

申请日：2016-09-09

Applicant: Apple Inc.

Inventor： Chenhua You ,  Abdeslam Hafidi ,  Jun Qi ,  Mingxia Gu ,  Victor H. Yin

IPC: F21V8/00 ,  G02F1/1335 ,  G06F3/041 ,  G02F1/1368 ,  G02F1/1333

CPC classification number: G02B6/0021 ,  G02B6/00 ,  G02B6/0016 ,  G02B6/0068 ,  G02B6/0073 ,  G02B6/0078

Abstract: A display such as a liquid crystal display may have an array of pixels that is illuminated using backlight illumination from a backlight. The backlight may have a light guide plate that distributes light from light-emitting diodes across the display. The light-emitting diodes may be overlapped by the light guide plate and may emit light into portions of the light guide plate that have ramped profiles. Light-emitting diodes for the backlight may have multiple light-emitting diode dies mounted on common package substrates. Reflective walls may be formed between the light-emitting diode dies on a substrate. Phosphor may cover the dies. The light-emitting diodes may contain four light-emitting diode dies that emit light in four different directions. Two or more of the dies may emit light of different colors. Light may be emitted into the corners of rectangular light distribution regions of a light guide plate.

公开(公告)号：US10571744B1

公开(公告)日：2020-02-25

申请号：US16388496

申请日：2019-04-18

Applicant: Apple Inc.

Inventor： Sean C. Chang ,  Tobias Jung ,  Marc Albrecht ,  Abdeslam Hafidi ,  Jun Qi ,  Duane M. Petrovich ,  Mingxia Gu ,  Xiang Fang ,  Pierre-Yves Emelie ,  Wei H Yao

IPC: G02F1/1335 ,  G09G3/36 ,  G09G3/34

Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

公开(公告)号：US20190265548A1

公开(公告)日：2019-08-29

申请号：US16409567

申请日：2019-05-10

Applicant: Apple Inc.

Inventor： Rong Liu ,  Yu P. Sun ,  Abdeslam Hafidi ,  Erik A. Zweigle ,  Jun Qi ,  Mingxia Gu ,  Victor H. Yin ,  Xiangtong Li ,  Yanming Li ,  Yi Huang ,  Ziruo Hong

IPC: G02F1/1335

Abstract: An array of pixels in a display may be illuminated by a backlight having an array of light-emitting diodes in an array of respective cells. A reflector is used to reflect light from the light-emitting diodes through the array of pixels. Within the cells, the reflector has cross-sectional profiles that help distribute light emitted from the light-emitting diodes toward edges of the cells. A light diffuser layer for the backlight may have a partially reflective layer such as a thin-film interference filter with an angularly dependent transmission. Within each cell, the reflector may have cross-sectional profiles with portions that are parabolic or elliptical.