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. 10, 1984
Filed:
May. 01, 1981
Michael H Kalmanash, Fairfield, CT (US);
Edward L Young, West Haven, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A color switch for a beam penetration CRT can display a randomly selected color in a first color write period, and immediately after the first color write period the magnetizing current in the high voltage transformer is reset during a second write period in a complementary color. A high voltage power supply has an output voltage selected to provide a baseline color whose voltage level is intermediate the voltage range of the CRT anode. A pair of drivers are connected to either end of the primary winding of the high voltage transformer and generate a voltage differentially across the primary winding that drives the voltage level either upwardly or downwardly from the baseline level. Immediately after the first color write period, a second color write period is formed in a complementary color by transitioning a pair of input switches. This causes the color switch to change to the voltage level on the opposite side of the baseline voltage level so that the flux level in the core of the transformer is reset to a balanced DC condition.