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:
Feb. 19, 2002
Filed:
Feb. 02, 1999
Applicant:
Inventors:
Ichirou Takayama, Ibaraki, JP;
Michio Arai, Tokyo, JP;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/9786 ; H01L 3/10368 ;
U.S. Cl.
CPC ...
H01L 2/9786 ; H01L 3/10368 ;
Abstract
In an image display system using an organic EL element, variation of light intensity of pixels on a display panel due to variation of characteristics of a bias transistor for energizing said EL element is improved. An active layer of said bias transistor is formed by polysilicon, and length and width of a gate of said transistor is at least 10 times as large as average diameter of a crystal grain of polysilicon in said active layer.