公开(公告)号：US20200005716A1

公开(公告)日：2020-01-02

申请号：US16567972

申请日：2019-09-11

Applicant: Apple Inc.

Inventor： Junhua Tan ,  Kingsuk Brahma ,  Jie Won Ryu ,  Shengkui Gao ,  Shiping Shen ,  Majid Gharghi ,  Hyunwoo Nho ,  Injae Hwang ,  Kavinaath Murugan ,  Sun-Il Chang ,  Chin Wei Lin ,  Hyunsoo Kim ,  Rui Zhang ,  Jesse Aaron Richmond ,  Yun Wang ,  Hung Sheng Lin ,  Alex H. Pai ,  Chaohao Wang ,  Wei H. Yao

IPC: G09G3/3283 ,  G09G3/3291 ,  G09G3/3241 ,  G09G3/3258

Abstract: The present disclosure relates generally to systems and methods that may reduce a reduction in visual artifacts related to hysteresis of a light emitting diode (LED) electronic display. In one example, an electronic device may include a controller. The controller is may provide a signal to a pixel of a display of the electronic device while at least a portion of the display is turned off. The signal may include a first current and a second current. The first current may be designed to increase an ambient temperature corresponding to the pixel. The second current may be generated as part of an active panel conditioning operation. By applying the first current and the second current, hysteresis settling times from the pixel may improve, therefore improving speeds of sensing and compensation operations of the electronic device.

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.