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. 09, 1984
Filed:
May. 01, 1981
Michael H Kalmanash, Fairfield, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A high voltage color switch for a beam penetration CRT includes a constant current driver which provides a bias current to the high voltage transformer in the first color write period when the baseline color is being displayed. One or more secondary colors can be displayed during a second color write period during which a switch connects the transformer to a conventional voltage driver that provides the needed voltage swing. At the end of a secondary color write period the constant current driver is again connected to reset the flux level in the transformer to one end of its dynamic range. During a core reset interval only a small voltage offset appears on the anode of the CRT so that color information written in the baseline color appears without any perceivable change to a viewer. At the end of the core reset period the constant current source continues to supply a constant bias current to the primary winding of the transformer to maintain the flux level at one end of its dynamic range.