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:
Apr. 23, 2002
Filed:
Jun. 22, 1999
Albertus A. S. Sluyterman, Eindhoven, NL;
Nicolaas G. Vink, Eindhoven, NL;
Tjerk G. Spanjer, Eindhoven, NL;
Leopold C. M. Beirens, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a color display device comprising an in-line electron gun ( ) for generating three electron beams ( ), and a convergence unit ( ) to dynamically influence the convergence of the electron beams, preferably to decrease a distance (p) between the electron beams. The convergence unit ( ) comprises a ring-shaped element ( ) having four coils ( ) and a longitudinal axis ( ). A cross-section of the ring-shaped element ( ) with a plane perpendicular to the longitudinal axis ( ) is a circle with the longitudinal axis as its center and the ring-shaped element ( ) forming the circumference. Each coil extends over the circumference over an angle &phgr; having a value between ° and