US 10,950,182 B2Granted

Device and method for panel conditioning

AssigneeApple Inc.

InventorsJunhua 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

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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.

Claims20

Dependent claims

An electronic device, comprising:

a display having a plurality of pixels, wherein each pixel of the plurality of pixels comprises:
a respective light-emitting device;
a respective transistor coupled to the respective light-emitting device and configured to deliver current to the respective light-emitting device when the respective transistor is on;
and
a respective switch coupled to the respective transistor to direct the current away from the respective light-emitting device when the respective switch is closed;
and
a controller configured to:
transmit at least a first control signal to a first pixel of the plurality of pixels to turn on a first transistor of the first pixel and to close a first switch of the first pixel;
transmit an active panel conditioning current through the first transistor and the first switch while bypassing a first light-emitting device of the first pixel;
and
in response to an ambient temperature of the display being less than a threshold temperature value, transmit an additional heat-generating current along with the active panel conditioning current through the first transistor and the first switch while bypassing the first light-emitting device of the first pixel.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/567,972Filed 11 Sep 2019 · continuation in part
Priority: 27 Mar 2018
Published: US 2020/0005716 A12 Jan 2020
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G09G 3/3283
Details of drivers for data electrodes: in which the data driver supplies a variable data current for setting the current through, or the voltage…
G09G 3/3241
With pixel circuitry controlling the current through the light-emitting element: the current through the light-emitting element being set using a…
G09G 3/3258
Using an active matrix: with pixel circuitry controlling the voltage across the light-emitting element
G09G 3/3291
Details of drivers for data electrodes: in which the data driver supplies a variable data voltage for setting the current through, or the voltage…