公开(公告)号：US10916198B2

公开(公告)日：2021-02-09

申请号：US16716911

申请日：2019-12-17

Applicant: Apple Inc.

Inventor： Chin-Wei Lin ,  Shinya Ono ,  Zino Lee ,  Yun Wang ,  Fan Gui

IPC: G09G3/3258 ,  H01L27/32 ,  H01L29/786

Abstract: A display pixel is provided that is operable to support hybrid compensation scheme having both in-pixel threshold voltage canceling and external threshold voltage compensation. The display may include multiple p-type silicon transistors with at least one n-type semiconducting-oxide transistor and one storage capacitor. An on-bias stress phase may be performed prior to a threshold voltage sampling and data programming phase to mitigate hysteresis and improve first frame response. In low refresh rate displays, a first additional on-bias stress operation can be performed separate from the threshold voltage sampling and data programming phase during a refresh frame and a second additional on-bias stress operation can be performed during a vertical blanking frame. The display pixel may be configured to receive an initialization voltage and an anode reset voltage, either of which can be dynamically tuned to match the stress of the first and second additional on-bias stress operations to minimize flicker.

公开(公告)号：US20210020109A1

公开(公告)日：2021-01-21

申请号：US17062786

申请日：2020-10-05

Applicant: Apple Inc.

Inventor： Chin-Wei Lin ,  Shinya Ono ,  Zino Lee ,  Yun Wang ,  Fan Gui

IPC: G09G3/3258 ,  H01L27/32 ,  H01L29/786

Abstract: A display pixel is provided that is operable to support hybrid compensation scheme having both in-pixel threshold voltage canceling and external threshold voltage compensation. The display may include multiple p-type silicon transistors with at least one n-type semiconducting-oxide transistor and one storage capacitor. An on-bias stress phase may be performed prior to a threshold voltage sampling and data programming phase to mitigate hysteresis and improve first frame response. In low refresh rate displays, a first additional on-bias stress operation can be performed separate from the threshold voltage sampling and data programming phase during a refresh frame and a second additional on-bias stress operation can be performed during a vertical blanking frame. The display pixel may be configured to receive an initialization voltage and an anode reset voltage, either of which can be dynamically tuned to match the stress of the first and second additional on-bias stress operations to minimize flicker.

公开(公告)号：US20200312234A1

公开(公告)日：2020-10-01

申请号：US16859272

申请日：2020-04-27

Applicant: Apple Inc.

Inventor： Chin-Wei Lin ,  Shinya Ono ,  Vasudha Gupta

IPC: G09G3/325 ,  G09G3/3258 ,  G09G3/3291 ,  G06F3/041 ,  G06F3/044 ,  H01L27/32 ,  G09G3/3233 ,  G09G3/3275

Abstract: A display may include an array of organic light-emitting diode display pixels having transistors characterized by threshold voltages subject to transistor variations. Compensation circuitry may be used to measure a transistor threshold voltage for a pixel. The threshold voltage may be sampled by controlling the pixel to sample the threshold voltage onto a capacitor at the pixel. The pixel may include at least one semiconducting-oxide transistor, silicon transistors, and a light-emitting diode. The diode may be coupled to a data line that can be used for both data loading and compensation sensing operations. Reset operations may be performed after data programming and before emission to reset the anode voltage for the diode.

公开(公告)号：US20200302853A1

公开(公告)日：2020-09-24

申请号：US16746288

申请日：2020-01-17

Applicant: Apple Inc.

Inventor： Shinya Ono ,  Chin-Wei Lin ,  Jie Won Ryu

IPC: G09G3/20

Abstract: The present disclosure relates to an electronic device that includes a display that has a plurality of scan lines. The display also includes a first data line that has a first number of pixels. The first data line forms a first number of crossovers with the plurality of scan lines. Additionally, the display includes a second data line that has a second number of pixels that is different than the first number of pixels. The second data line forms a second number of crossovers with the plurality of scan lines that is equal to the first number of crossovers.

公开(公告)号：US10559238B2

公开(公告)日：2020-02-11

申请号：US15698262

申请日：2017-09-07

Applicant: Apple Inc.

Inventor： Hung Sheng Lin ,  Shengkui Gao ,  Hyunwoo Nho ,  Chin-Wei Lin ,  Mohammad B Vahid Far ,  Jie Won Ryu ,  Kingsuk Brahma ,  Junhua Tan ,  Sun-II Chang ,  Shinya Ono ,  Jesse A Richmond ,  Yafei Bi ,  Derek K. Shaeffer

IPC: G09G3/00

Abstract: Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.

公开(公告)号：US10395590B1

公开(公告)日：2019-08-27

申请号：US15247698

申请日：2016-08-25

Applicant: Apple Inc.

Inventor： Chin Wei Lin ,  Shinya Ono ,  Vasudha Gupta ,  Mohammad B. Vahid Far

IPC: G09G3/3233 ,  G09G3/3275

Abstract: Methods, systems, and apparatuses for controlling an emission of the light emitting devices are described herein. The light emitting devices may be light emitting diode (LED) devices including μLED devices or organic LED (OLED) devices. Emission control of the LED may be performed using a micro-scale driving circuit (e.g., μDriver) containing drive transistors for constant current driving of the light emitting devices. One embodiment provides for a display driver hardware circuit comprising a thin film transistor (TFT) backplane, an integrated circuit including emission logic to cause an LED emission pulse, and a ramp signal generator to cause a voltage ramp having a slope based on an analog input voltage from the TFT backplane. The length of the LED emission pulse is related to the slope of the voltage ramp. In one embodiment the TFT backplane includes a low temperature poly-silicon (LTPS) transistor and/or an Indium Gallium Zinc Oxide (IGZO) transistor.

公开(公告)号：US20190197954A1

公开(公告)日：2019-06-27

申请号：US16289007

申请日：2019-02-28

Applicant: Apple Inc.

Inventor： Chin-Wei Lin ,  Hung Sheng Lin ,  Shih Chang Chang ,  Shinya Ono

IPC: G09G3/3233 ,  H01L27/12 ,  G09G3/3266 ,  H01L29/786 ,  G09G3/3275

CPC classification number: G09G3/3233 ,  G09G3/3266 ,  G09G3/3275 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2310/0202 ,  G09G2320/0295 ,  G09G2320/043 ,  H01L27/1225 ,  H01L29/78651 ,  H01L29/7869

Abstract: A display may have an array of pixels each of which has a light-emitting diode such as an organic light-emitting diode. A drive transistor and an emission transistor may be coupled in series with the light-emitting diode of each pixel between a positive power supply and a ground power supply. The pixels may include first and second switching transistors. A data storage capacitor may be coupled between a gate and source of the drive transistor in each pixel. Signal lines may be provided in columns of pixels to route signals such as data signals, sensed drive currents from the drive transistors, and predetermined voltages between display driver circuitry and the pixels. The switching transistors, emission transistors, and drive transistors may include semiconducting-oxide transistors and silicon transistors and may be n-channel transistors or p-channel transistors.

公开(公告)号：US20190088207A1

公开(公告)日：2019-03-21

申请号：US16134802

申请日：2018-09-18

Applicant: Apple Inc.

Inventor： Chin-Wei Lin ,  Majid Gharghi ,  Mohammad Reza Esmaeili Rad ,  Yun Wang ,  Jie Won Ryu ,  Kingsuk Brahma ,  Shingo Hatanaka ,  Shinya Ono ,  Ting-Kuo Chang

IPC: G09G3/3266 ,  G09G3/3233

Abstract: A display may have rows and columns of pixels. Gate lines may be used to supply gate signals to rows of the pixels. Data lines may be used to supply data signals to columns of the pixels. The data lines may include alternating even and odd data lines. Data lines may be organized in pairs each of which includes one of the odd data lines and an adjacent one of the even data lines. Demultiplexer circuitry may be configured dynamically during data loading and pixel sensing operations. During data loading, data from display driver circuitry may be supplied, alternately to odd pairs of the data lines and even pairs of the data lines. During sensing, the demultiplexer circuitry may couple a pair of the even data lines to sensing circuitry in the display driver circuitry and then may couple a pair of the odd data lines to the sensing circuitry.

公开(公告)号：US20170365214A1

公开(公告)日：2017-12-21

申请号：US15431337

申请日：2017-02-13

Applicant: Apple Inc.

Inventor： Tsung-Ting Tsai ,  Shinya Ono ,  Chin-Wei Lin ,  Ting-Kuo Chang

IPC: G09G3/3233 ,  H01L51/52 ,  G09G3/3266 ,  H01L27/32

CPC classification number: G09G3/3233 ,  G09G3/3266 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2310/08 ,  G09G2320/041 ,  G09G2320/045 ,  H01L27/3279

Abstract: An organic light-emitting diode display may contain an array of display pixels. Each display pixel may have a respective organic light-emitting diode that is controlled by a drive transistor. At low temperatures, it may be necessary to increase the amount of current through an organic light-emitting diode to achieve a desired luminance level. In order to increase the current through the light-emitting diode, the ground voltage level may be lowered. However, this may lead to thin-film transistors within the pixel leaking, which may result in undesirable display artifacts such as bright dots being displayed in a dark image. In order to prevent leakage in the transistors, the transistors may be coupled to separate reference voltage supplies or separate control lines. Additionally, the transistors may be positioned to minimize leakage even at low ground voltage levels.

公开(公告)号：US20170365213A1

公开(公告)日：2017-12-21

申请号：US15246345

申请日：2016-08-24

Applicant: Apple Inc.

Inventor： Warren S. Rieutort-Louis ,  Keitaro Yamashita ,  Tsung-Ting Tsai ,  Yun Wang ,  Ting-Kuo Chang ,  Cheng-Ho Yu ,  Shinya Ono

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G3/3266 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/041 ,  G09G2320/045

Abstract: An organic light-emitting diode display may contain an array of display pixels. Each display pixel may have a respective organic light-emitting diode that is controlled by a drive transistor. At low temperatures, it may be necessary to increase the amount of current through an organic light-emitting diode to achieve a desired luminance level. In order to increase the current through the light-emitting diode, the ground voltage level may be lowered. However, this may lead to thin-film transistors within the pixel leaking, which may result in undesirable display artifacts such as bright dots being displayed in a dark image. In order to prevent leakage in the transistors, the transistors may be coupled to separate reference voltage supplies or separate control lines. Additionally, the transistors may be positioned to minimize leakage even at low ground voltage levels.