The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2014
Filed:
Nov. 04, 2010
Yuichi Maekawa, Shagamihara, JP;
Koichi Miwa, Yokohama, JP;
Yuichi Maekawa, Shagamihara, JP;
Koichi Miwa, Yokohama, JP;
Global OLED Technology LLC, Herndon, VA (US);
Abstract
Compensate for the variations of threshold voltage of a driving transistor. During the period of the reference signal voltage Vref being set to the signal line DTC, voltage between the gate and source of the driving transistorC is made equal to or greater than the threshold voltage of the driving transistorC, and the difference in voltage of the reference signal voltage Vref and the reference power supply voltage Vref_r is charged to the retentive capacitanceB. At the same time, the voltage of the source of the said driving transistorC is set to the reference power supply voltage Vref_r to make the voltage applied to the light emitting elementE equal to or lower than its threshold voltage, a voltage corresponding to the threshold voltage of the driving transistorC is held in the retentive capacitanceB. During a period of time when a display signal voltage is set to the signal line DTC, the sampling transistorA is conducting, so as to sample the signal voltage, and this signal voltage is superposed on the threshold voltage held in the retentive capacitance.