| 摘要 |
PURPOSE:To operate a direct driving system horizontal oscillation circuit in the multi-scan system by controlling the phase and pulse width of a horizontal oscillation pulse in response to the horizontal frequency. CONSTITUTION:A 1st control circuit 3 is provided so as to control the pulse width in a way that the horizontal synchronizing signal and a flyback pulse are in phase even when the horizontal frequency is changed. Moreover, a 2nd control circuit 4 is provided to adjust the duty in matching with the horizontal drive by controlling the pulse width of the horizontal oscillation pulse outputted from a 2nd monostable multivibrator 2. The phase and pulse width of the horizontal oscillation pulse are controlled in response to the horizontal frequency by using the 1st and 2nd control circuits 3, 4, thereby applying normal drive even when the horizontal frequency is switched through the application of the circuit to the multi-scan system and keeping the picture at a constant position. |
