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:
Dec. 19, 1978
Filed:
Jan. 23, 1978
George H Kam, Tonawanda, NY (US);
Robert P Logan, Framingham, MA (US);
GTE Sylvania Incorporated, Stamford, CT (US);
Abstract
Cathode ray tube adjusting apparatus in a color television receiver includes a matrix and amplifier circuit coupled to a chrominance signal source, selectively coupled by a 'service-normal' switch to a luminance or reference signal source. The matrixing and amplifying circuit includes a control grid DC bias potential development circuit and a cathode DC bias potential adjusting circuit, and is coupled to a cathode ray tube. In the 'service' switching position, the DC bias potential adjusting circuit is varied to provide the proper cut-off potential conditions for the cathode ray tube. In the 'normal' switchingposition, chrominance and luminance signals are matrixed and luminance signal drive is adjusted to provide the proper color temperature appearing on a viewing screen of the cathode ray tube.