Switching degaussing circuit for television set

Details Switching degaussing circuit for television set Switching degaussing circuit for television set

1996-01-11

1998-04-28

Peng, John K.

Television

Receiver circuitry

315 8, 361150, H04N 929

Patent

active

057451915

ABSTRACT:
An improved degaussing circuit for a television set capable of preventing color blurring phenomenon and picture quality deterioration by degaussing television set of which its picture quality is affected by an external magnetic field at the time of turning on and turning off the television set, which includes an LC oscillating circuit for receiving a first direct current voltage and for flowing a degaussing current; a switching unit sequentially turned on in accordance with a turning on/off operation of a television set for enabling an oscillating operation of the LC oscillating circuit; a first trigger circuit for receiving a second direct current voltage and for enabling the LC oscillating circuit by turning on the switching unit after a certain time is lapsed after the television set is turned on; a second trigger circuit for receiving a second direct current voltage for turning off the switching unit when the LC oscillating circuit completes the degaussing operation in accordance with a control of the first trigger circuit when the television set is turned on; and a third trigger circuit for receiving a third direct current voltage and for turning on the switching unit when the television set is turned off, the third trigger circuit being blocked when the television set is turned on, thus preventing color blurring of picture by sequentially degaussing after the television set is turned on, thus improving the picture quality.

REFERENCES:
patent: 4489253 (1984-12-01), Godawski
patent: 5170096 (1992-12-01), Kang et al.
patent: 5475283 (1995-12-01), Yoshida

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