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. 20, 2007
Filed:
Nov. 04, 2003
Takayoshi Yoshida, Yonezawa, JP;
Katsuhiro Kanauchi, Yonezawa, JP;
Takayoshi Yoshida, Yonezawa, JP;
Katsuhiro Kanauchi, Yonezawa, JP;
Tohoku Pioneer Corporation, Yamagata, JP;
Abstract
In a drive device for an active type light emitting display panel which can apply a reverse bias voltage to an EL element, in order to be able to compensate deterioration in light-emitting efficiency of the EL element accompanied by applying of the reverse bias voltage and the like, one pixelis composed of a controlling TFT (Tr), the driving TFT (Tr), a capacitor Cand the EL element ESwitching switches SWSWmutually enables a supplying state of a forward current to the EL element Eand an applying state of the reverse bias voltage to be selected. In one control form according to the present invention, when the applying state of the reverse bias voltage shifts to the supplying state of the forward current, by switching one switch first, the anode and cathode of the EL element Eare made to the same electrical potential to allow electrical charges to be discharged. Thus, charge of the forward current for a parasitic capacitance of the EL element Ecan be performed rapidly, and rising of the lighting operation of the EL element can be advanced.