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:
Oct. 26, 1976
Filed:
May. 24, 1973
Leonard Dietch, Skokie, IL (US);
Zenith Radio Corporation, Chicago, IL (US);
Abstract
A color cathode-ray tube having a phosphor screen including a pattern of red-emitting, blue-emitting and green-emitting phosphor deposits. Electron gun means generates first, second and third angularly spaced electron beams for exciting the phosphor elements. A parallax mask is disposed adjacent the screen and has a pattern of openings for causing the first, second and third electron beams to impinge exclusively on the red-emitting, blue-emitting and green-emitting phosphor deposits, respectively. The openings in the mask and the phosphor deposits are dimensioned relative to each other such that the beam spots formed through the mask openings and the respectively associated phosphor deposits have a relative dimensional difference which varies between the central portion and the peripheral portions of the screen from a condition in which the beam spots have a greater dimension than the associated phosphor deposits to a condition in which the beam spots have a dimension smaller than the associated phosphor deposits. The screen has light absorptive material between the phosphor deposits in at least those portions of the screen wherein the said beam spot dimension is larger than the associated phosphor deposit dimension.