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:
Jul. 24, 2007
Filed:
Feb. 04, 2004
Takayoshi Yoshida, Yonezawa, JP;
Takayoshi Yoshida, Yonezawa, JP;
Tohoku Pioneer Corporation, Tendo-shi, JP;
Abstract
In a light emitting display device which is actively driven by TFTs, light emitting display pixels are driven efficiently. In a light emitting display panel, a large number of light emitting display pixelsare arranged in a matrix pattern and measuring pixelsare arranged forming a line along one dataline. A constant current is supplied from a constant current sourceto the measuring pixels, and the forward voltage VF of the EL element in the measuring pixelis obtained by a voltage detecting terminalThe value of the drive voltage supplied to the light emitting display pixelsis controlled based on the forward voltage VF. Thus, a drive TFT (Tr) constructing the light emitting display pixelcan drive an EL element Ein the state where a drop voltage (VD) of the degree by which a constant current characteristic can be ensured is ensured, and a power loss generated in the drive TFT can be effectively restrained.