公开(公告)号：US20180082622A1

公开(公告)日：2018-03-22

申请号：US15711817

申请日：2017-09-21

申请人： Hopil Bae ,  Mahdi Farrokh Baroughi ,  Mohammad B. Vahid Far ,  Xiang Lu ,  Bo Yang ,  Derek K. Shaeffer ,  Henry C. Jen

发明人： Hopil Bae ,  Mahdi Farrokh Baroughi ,  Mohammad B. Vahid Far ,  Xiang Lu ,  Bo Yang ,  Derek K. Shaeffer ,  Henry C. Jen

IPC分类号： G09G3/00 ,  G09G3/36

CPC分类号： G09G3/006 ,  G09G3/32 ,  G09G3/367 ,  G09G2310/0275

摘要： The present techniques are capable of identifying and pinpointing defective microdrivers and/or row/column drivers either before or after any μLEDs have been placed on the display. Using the architectures described herein, test data may be delivered in a parallel fashion to the drivers from support circuitry, such as a timing controller and/or a main board, and outputs based on the test data may be similarly delivered back to the support circuitry do determine which drivers are defective. This yields access to the output of every microdriver and row drier, thus enabling the identification of specific defective elements.

公开(公告)号：US10217402B1

公开(公告)日：2019-02-26

申请号：US15247634

申请日：2016-08-25

申请人： Mohammad B. Vahid Far ,  Yafei Bi ,  Shinya Ono ,  Hopil Bae ,  Chieh-Chien Lin ,  Hasan Akyol ,  Xiaofeng Wang

发明人： Mohammad B. Vahid Far ,  Yafei Bi ,  Shinya Ono ,  Hopil Bae ,  Chieh-Chien Lin ,  Hasan Akyol ,  Xiaofeng Wang

IPC分类号： G09G3/22 ,  G09G3/20

摘要： Methods and devices useful in compensating for VDD and VTH variations in a micro light-emitting diode (micro-LED) display are provided. By way of example, an LED driver includes a first transistor having a first source coupled to an upper voltage rail (VDD), a first gate, and a first drain. The LED driver includes a second transistor having a second source coupled to the first drain of the first transistor, a second gate, and a second drain coupled to the LED. The second transistor is configured to receive the drive current signal from the first transistor and supply the drive current signal to the LED. The LED driver includes compensation circuitry configured to adjust the drive current signal such that the drive current signal is independent of the upper voltage rail (VDD) and a threshold voltage (VTH) of the first transistor or the second transistor.

公开(公告)号：US10319278B1

公开(公告)日：2019-06-11

申请号：US15251920

申请日：2016-08-30

申请人： Hyunwoo Nho ,  Mohammad B. Vahid Far ,  Xiaofeng Wang

发明人： Hyunwoo Nho ,  Mohammad B. Vahid Far ,  Xiaofeng Wang

IPC分类号： G09G3/20

摘要： Systems and methods are provided for generating a nonlinear clock signal. Such a signal may be used to drive sub-pixels of an electronic display. The electronic display may include a microdriver that drives at least one sub-pixel based at least in part on an image data signal and an emission clock signal. The image data signal specifies a gray level for driving the sub-pixel and the emission clock signal includes a series of pulses of monotonically increasing pulse widths to enable the microdriver to drive the sub-pixel to emit light for a particular amount of time associated with the gray level. An emission timing controller may generate the emission clock signal.