公开(公告)号：US11568816B1

公开(公告)日：2023-01-31

申请号：US17592081

申请日：2022-02-03

Applicant: Meta Platforms Technologies, LLC

Inventor： Jeong-Keun Ahn ,  Min Hyuk Choi ,  Zhiming Zhuang

IPC: G09G3/3258 ,  G02B27/01 ,  G09G5/10 ,  G09G3/3233

Abstract: Embodiments of the present disclosure relate to a pixel circuit with a burn-in compensation. The pixel circuit includes a light-emitting diode (LED), a first driving transistor between a voltage source and the LED, a switching transistor coupled to a gate electrode of the first driving transistor, and a second driving transistor connected between the voltage source and the LED. The first driving transistor provides first current from the voltage source to the LED according to a gate voltage of the first driving transistor. The switching transistor is turned on after receiving an enable signal. The second driving transistor provides second current from the voltage source to the LED according to a version of the gate voltage of the first driving transistor received at a gate of the second driving transistor via the switching transistor.

公开(公告)号：US11568813B1

公开(公告)日：2023-01-31

申请号：US17741044

申请日：2022-05-10

Applicant: Meta Platforms Technologies, LLC

Inventor： Jeong-Keun Ahn ,  Zhiming Zhuang ,  Min Hyuk Choi

IPC: G09G3/3241

Abstract: Embodiments relate to a pixel circuit of a display with a pixel level burn-in compensation. The pixel circuit includes a light-emitting diode (LED), a first driving transistor between a voltage source and the LED, an enable transistor coupled to a gate electrode of the first driving transistor, and a second driving transistor connected between the voltage source and the LED. The first driving transistor provides first current from the voltage source to the LED according to a gate voltage of the first driving transistor. The enable transistor turns on responsive to a voltage level at an anode of the LED increasing to a threshold voltage level. The second driving transistor provides second current from the voltage source to the LED according to a version of the gate voltage of the first driving transistor received at a gate electrode of the second driving transistor via the enable transistor.

公开(公告)号：US20230011187A1

公开(公告)日：2023-01-12

申请号：US17371892

申请日：2021-07-09

Applicant: Meta Platforms Technologies, LLC

Inventor： Wenhao Qiao ,  Donghee Nam ,  Alexander Klement ,  Min Hyuk Choi

IPC: G09G3/3258 ,  G09G3/3291 ,  G02B27/01

Abstract: Embodiments relate to a display device including two or more sections of pixels in a display area powered by supply voltages in power rails. The display device also includes two or more power detection circuits connected to two or more locations along the power rails to detect local voltages at the locations. Depending on an image being display during a frame, the two or more sections of pixels may cause changes in local voltages at the two or more locations. The detected local voltages are provided to two or more voltage regulators, and the two or more voltage regulators update supply voltages provided to the power rails to compensate for the changes in the local voltages.

公开(公告)号：US11475849B1

公开(公告)日：2022-10-18

申请号：US17319015

申请日：2021-05-12

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Wenhao Qiao ,  Cheonhong Kim ,  Min Hyuk Choi

IPC: G09G5/00 ,  G09G3/3291

Abstract: Embodiments relate to a display device with reduced scanning time by using a reference line separate from a data line to improve frame rate of the display device. A first pixel in a first row samples a reference voltage during a first period and samples a data voltage during a second period. A second pixel in a second row adjacent to the first row samples the reference voltage during a third period and samples the data voltage during a fourth period, where the third period overlaps with at least a portion of the second period. The reference voltage is provided by the reference line that is connected to a reference buffer, and the data voltage is provided by the data line connected to a source driver circuit.

公开(公告)号：US11436987B1

公开(公告)日：2022-09-06

申请号：US17317701

申请日：2021-05-11

Applicant: Meta Platforms Technologies, LLC

Inventor： Cheonhong Kim ,  Min Hyuk Choi ,  Alexander Klement

IPC: G09G3/36 ,  G09G5/10 ,  G09G3/34

Abstract: A display device dynamically determines a duration of the illumination period for a display frame to adjust an average brightness of a display device as the framerate dynamically changes. The display device includes a backlight unit (BLU) for providing light for displaying an image, a plurality of pixels for modulating the light provided by the BLU, and a controller circuit for controlling the BLU. The controller circuit measure a duration of a previous frame and determine a duration for an illumination period of a current frame based on the measured duration of the previous frame. The control circuit then controls the BLU based on the determined duration of the illumination period for the current frame.