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:
Aug. 16, 2005
Filed:
Jun. 30, 2000
Masafumi Hoshino, Chiba, JP;
Susumu Fujita, Chiba, JP;
Tokuya Akase, Chiba, JP;
Hiroshi Odagiri, Chiba, JP;
Kazumi Sakumoto, Chiba, JP;
Masafumi Hoshino, Chiba, JP;
Susumu Fujita, Chiba, JP;
Tokuya Akase, Chiba, JP;
Hiroshi Odagiri, Chiba, JP;
Kazumi Sakumoto, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
In a light emitting indicator drive circuit which supplies a current to display elements different in display areas, a constant-current is supplied from a P-channel MOS-FET to a display element and a pulse width control circuit controls a on/off ratio. deterioration information from a deterioration detecting circuit and saved segment area information is calculated, and its result decides a time to supply a current to the display elements as a result of the arithmetic operation. With the above operation, a difference in luminance between the display elements and the degradation of luminance caused by the deterioration can be corrected.