公开(公告)号：US20180322827A1

公开(公告)日：2018-11-08

申请号：US15711585

申请日：2017-09-21

Applicant: Apple Inc.

Inventor： Sheng ZHANG ,  Chaohao WANG ,  Paolo SACCHETTO ,  Paul S. DRZAIC ,  Wei CHEN ,  Wei H. YAO

IPC: G09G3/3241 ,  G09G3/20

Abstract: A display device may include a display having a plurality of pixels. The display device may also include a replica pixel circuit having a switching device configured to output a first current based on a received voltage, a light-emitting diode (LED) configured to illuminate to a first gray level based on the first current output by the switching device, and current mirror circuitry configured to generate a second current that mirrors the first current. In addition, the replica pixel circuit may include a current source configured to output a reference current based on a voltage value that corresponds to the received voltage, comparator circuitry configured to determine a difference between the second current and the reference current, and voltage adjustment circuitry configured to adjust a source voltage output provided to the plurality of pixels based on the difference.

公开(公告)号：US20180090103A1

公开(公告)日：2018-03-29

申请号：US15673138

申请日：2017-08-09

Applicant: Apple Inc.

Inventor： Sheng ZHANG ,  Chaohao WANG ,  Cheuk Chi LO ,  Chun-Yao HUANG ,  Howard TANG ,  Paolo SACCHETTO

IPC: G09G5/10 ,  G01K13/00 ,  G01K7/34 ,  G09G3/20

CPC classification number: G09G5/10 ,  G01K1/026 ,  G01K7/01 ,  G01K7/18 ,  G01K7/34 ,  G01K13/00 ,  G06F3/044 ,  G09G3/2003 ,  G09G3/3225 ,  G09G3/3413 ,  G09G3/3607 ,  G09G3/3648 ,  G09G2300/0426 ,  G09G2300/0452 ,  G09G2310/0251 ,  G09G2320/0242 ,  G09G2320/041 ,  G09G2320/0626 ,  G09G2320/0666 ,  G09G2320/0693 ,  G09G2330/021 ,  G09G2330/023

Abstract: An apparatus is disclosed. In some examples, the apparatus comprises a display panel comprising a plurality of display pixels. In some examples, the apparatus comprises a plurality of temperature sensors disposed at different portions the display panel, wherein the plurality of temperature sensors comprise ratioed pairs of thin film transistors and the ratioed pairs of thin film transistors are formed on the display panel. In some examples, the apparatus comprises control circuitry for changing illumination properties of the plurality of display pixels based on changes is temperature detected by a proximate temperature sensor of the plurality of temperature sensors. In some examples, the ratioed pairs of thin film transistors are operated in a sub-threshold mode.

公开(公告)号：US20170358255A1

公开(公告)日：2017-12-14

申请号：US15438448

申请日：2017-02-21

Applicant: Apple Inc.

Inventor： Chaohao WANG ,  Paolo SACCHETTO ,  Sheng ZHANG ,  Yang LI ,  Myung-Je CHO ,  Marc ALBRECHT

IPC: G09G3/20

CPC classification number: G09G3/2055 ,  G09G3/2022 ,  G09G2320/0247 ,  G09G2320/0666

Abstract: This application relates to performing certain dithering processes to eliminate display artifacts such as flicker, which can be caused by charge accumulation at the display. The dither process can be performed by a display controller that uses a group lookup method for identifying groups of dithering patterns that can be combined to expand a number of color values available to the display. The dither process can also be performed as a temporal process that incorporates groups of dithering patterns into frames and shifts a spatial arrangement of the groups of dithering patterns over a sequence of frames. Additionally, the dither process can incorporate counters that count the number of times a particular spatial arrangement of dithering patterns has been used in a sequence of frames in order that each spatial arrangement of dithering patterns will share an average count with other spatial arrangements over a sequence of frames.