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:
Mar. 05, 2019
Filed:
Jun. 12, 2017
Dongbu Hitek Co., Ltd., Bucheon-si, KR;
Tae Ho Hwang, Uijeongbu-si, KR;
DB HiTek Co., Ltd., Seoul, KR;
Abstract
A circuit configured to sense a threshold voltage of an organic light emitting diode (OLED) of a display panel includes a sample and hold unit configured to receive the threshold voltage of the OLED, a first capacitor configured to sample the threshold voltage of the OLED, a second capacitor configured to charge-share the voltage on the first capacitor, an output terminal configured to output the voltage on the second capacitor, and an amplifier including an input terminal connected to the output terminal of the sample and hold unit. The sample and hold unit includes a first switching unit configured to selectively connect the OLED, the first capacitor, the second capacitor, the first capacitor and a first or second reference voltage, the second capacitor and the second or a third reference voltage, and the second capacitor and the output terminal.