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:
Jan. 21, 2003
Filed:
Aug. 02, 2000
Takashi Hanaki, Kariya, JP;
Koji Ogusu, Kariya, JP;
Shogo Kameyama, Chiryu, JP;
Kiyohito Narita, Takahama, JP;
Naoki Matsumoto, Aichi-gun, JP;
Denso Corporation, Kariya, JP;
Abstract
A segment-type electroluminescent display panel is driven by a driving circuit that supplies a constant current to each luminescent segment. The display panel includes plural luminescent segments each having a luminescent area different from one another. The plural segments are grouped into several groups, so that each group includes the segments having the same or similar luminescent area. The amount of current to be supplied to each segment is determined group by group so that a substantially same current density is supplied to all the segments. Since the plural segments are grouped according to their size, the driving circuit is simplified while attaining an equal luminance among all the luminescent segments. Alternatively, an equal amount of current is supplied to all the variously sized segments, and a resistor is connected in parallel to each segment to equalize the current density supplied to each segment thereby to achieve an equal luminance among all the segments.