Patent ID: 6242863
Filing Date: 2001-06-05
Classification: H04N

Abstract:
A spot killer circuit comprising:a first resistor having a first end connected to a ground potential;a power supply unit which supplies power;a first transistor having an emitter connected to a second end of said first resistor, a collector connected to said power supply unit, and a base receiving RGB signals;a second resistor having a first end connected to said power supply unit;a capacitor having a first end connected to the ground potential;a rectification unit connected between a second end of said second resistor and a second end of said capacitor, said rectification unit providing a current to said capacitor;a second transistor having an emitter connected to the second end of said capacitor, a base, and a collector connected to the second end of said first resistor;a third resistor connected between the second end of said second resistor and the base of said second transistor; anda switch unit connected between the second end of said second resistor and a ground potential, connecting and disconnecting said third resistor to the ground potential in response to a control signal.