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:
Apr. 23, 2019
Filed:
Mar. 18, 2016
Sharp Kabushiki Kaisha, Sakai, Osaka, JP;
Noritaka Kishi, Sakai, JP;
Hiroyuki Furukawa, Sakai, JP;
Katsuya Otoi, Sakai, JP;
Kazuyoshi Yoshiyama, Sakai, JP;
Tamotsu Sakai, Sakai, JP;
Naoko Gotoh, Sakai, JP;
SHARP KABUSHIKI KAISHA, Sakai, JP;
Abstract
In a current measurement period of a pixel circuit (), a measurement voltage is applied to a non-inverting input terminal of an operational amplifier (), switches () turn on, and a switch () turns off. Next, the switch () turns off, and a capacitor () is charged with charge of a current flowing through the pixel circuit (). Next, the switch () turns off, the switch () turns on, a constant current flows through a current source (), and a voltage of a second terminal (terminal connected to an output terminal of the operational amplifier ()) of the capacitor () decreases. A voltage comparator () and a counter () measure the current flowing through the pixel circuit () by measuring time until a voltage of the second terminal of the capacitor reaches a voltage Vcomp. A video signal VSis corrected based on a current measurement result. With this, it is possible to compensate for capacitance variation of a capacitance in a current measurement circuit and perform high image quality display.