VERTICAL SHIFT CONTROL CIRCUIT OF MONITOR SCREEN

摘要

PURPOSE: A vertical shift control circuit of a monitor screen is provided to freely adjust a display starting point of a screen by changing a phase of a vertical synchronous signal according to a pulse width conversion unit within a period of the vertical synchronous signal. CONSTITUTION: A vertical synchronous signal(VSY1) is applied to an input terminal(IN1) in the first monostable multivibrator(1). A resistance(RX1) and a condenser(CX1) are connected to the first monostable multivibrator(1). An output signal of the first monostable multivibrator(1) is applied to an input terminal(IN2) in the second monostable multivibrator(2). A variable resistance(RX2) and a condenser(CX2) are connected to the second monostable multivibrator(2). An output signal of the second monostable multivibrator(2) is applied to an input terminal(IN3) in the third monostable multivibrator(3). A resistance(RX3) and a condenser(CX3) are connected to the third monostable multivibrator(3). A vertical synchronous signal(VSY0) is outputted from an output terminal(OUT3) in the third monostable multivibrator(3).