Patent ID: 6396222
Filing Date: 2002-05-28
Classification: H04N

Abstract:
A cathode ray tube protection system in a projection television, the system comprising:a high voltage output unit for providing a high voltage; a high voltage variation detector for detecting a varied high voltage from said high voltage provided by said high voltage output unit; a cathode ray tube driver for providing a predetermined voltage to drive said cathode ray tube; a medium voltage power supply fuse short-circuit detector for detecting a short-circuit state of a medium voltage fuse based on the operation state of said cathode ray tube driver; and a pulse width modulation processor for generating a pulse width modulation signal based on the outputs from said high voltage variation detector and said medium voltage power supply fuse short-circuit detector, wherein said pulse width modulation processor limits the output of said high voltage output unit when the medium voltage fuse short-circuits, regardless of the varied high voltage signal.