公开(公告)号：US10276105B2

公开(公告)日：2019-04-30

申请号：US15616630

申请日：2017-06-07

Applicant: QUALCOMM Incorporated

Inventor： Jia Wei Ma ,  Heesun Shin ,  Wei Hsiang Weng ,  Cheonhong Kim ,  Jan Bos

IPC: G09G3/3291 ,  G09G3/3266 ,  G09G3/3233 ,  G09G3/3258

Abstract: This disclosure provides systems, methods and apparatus for OLED control circuits. In some implementations, the OLED control circuit can be configured to reverse the bias of the OLED without the use of a dedicated initialization voltage. A low voltage data signal applied on a data line can be used to drain voltage from the anode of the OLED through a diode-connected transistor. A high voltage data signal applied on the same data line can be used to store a reference voltage on a storage capacitor, where the reference voltage is also a function of the threshold voltage of a driving transistor of the OLED control circuit. The stored reference voltage can be used to compensate for the threshold voltage of the driving transistor when the OLED is energized by a current, so that the current is independent of the threshold voltage of the driving transistor.

公开(公告)号：US20180357966A1

公开(公告)日：2018-12-13

申请号：US15616630

申请日：2017-06-07

Applicant: QUALCOMM Incorporated

Inventor： Jia Wei Ma ,  Heesun Shin ,  Wei Hsiang Weng ,  Cheonhong Kim ,  Jan Bos

IPC: G09G3/3291 ,  G09G3/3266

CPC classification number: G09G3/3291 ,  G09G3/3233 ,  G09G3/3258 ,  G09G3/3266 ,  G09G2300/0426 ,  G09G2300/0465 ,  G09G2300/0814 ,  G09G2300/0819 ,  G09G2300/0823 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/043 ,  G09G2320/045

Abstract: This disclosure provides systems, methods and apparatus for OLED control circuits. In some implementations, the OLED control circuit can be configured to reverse the bias of the OLED without the use of a dedicated initialization voltage. A low voltage data signal applied on a data line can be used to drain voltage from the anode of the OLED through a diode-connected transistor. A high voltage data signal applied on the same data line can be used to store a reference voltage on a storage capacitor, where the reference voltage is also a function of the threshold voltage of a driving transistor of the OLED control circuit. The stored reference voltage can be used to compensate for the threshold voltage of the driving transistor when the OLED is energized by a current, so that the current is independent of the threshold voltage of the driving transistor.