| 摘要 |
PURPOSE:To reduce vertical moire due to interference between a scanning line and an aperture pitch of a shadow mask of a CRT by shifting in the vertical direction relatively a display position on a screen for each vertical period and controlling a shift with a DC. CONSTITUTION:A resistor 21 is connected in parallel with an S-shape correction capacitor 42 and a switch 22 is switched by a control signal with a period twice a vertical period. With the switch 22 closed, a current is added to a vertical deflection current through the resistor 21, the switch 22 and a DC voltage source 5 to shift the display position on a screen. A voltage of the DC voltage source 5 is controlled by a control DC voltage to control the shift of the display position on the screen. |
