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:
Jun. 13, 1989
Filed:
Jun. 17, 1988
Applicant:
Inventors:
Assignee:
Toshiba Electric Equipment Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
3151694 ; 3151692 ; 3151693 ; 315291 ; 315D / ; 3152 / ; 3151691 ; 340813 ; 340767 ; 340811 ; 340793 ;
Abstract
A large image display apparatus comprises a plurality of discharge lamps each having an anode, a cathode and a light emitting tube, a display board having the plurality of discharge lamps thereon, a heating circuit for heating the cathodes of the plurality of discharge lamps, a power supply circuit for generating a rectified high frequency voltage and biasing the plurality of discharge lamps, an image signal generator for generating an image signal, and a control circuit for controlling the quantity of light emitted from each discharge lamp in response to the image signal.