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:
May. 28, 1991
Filed:
May. 03, 1989
Applicant:
Inventor:
Norio Ito, Suwa, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315224 ; 315309 ; 315311 ; 315D / ;
Abstract
A back-light device increases the level of luminance produced by a fluorescent lamp at low and high ambient temperatures by increasing the ballast capacitance at these temperatures. The ballast capacitor can include one or more capacitors made from ceramic or the like. The back-light device can be used with different types of video display apparatuses which employ a transmission-type video display plate.