Matsushita Electric Industrial Co., Ltd.

Masao Yamazaki

Tsutomu Kitamura

Horizontal moire phenomenon is reduced by producing a control signal by a moire canceling circuit comprising a frequency divider (1,201,301,401) and a horizontal position shifting circuit (2, 202, 302, 402), and supplying the control signal to a deflection circuit block (3).

Display monitor including moire cancellation circuit

In a vertical deflection circuit of a display monitor including a vertical deflection coil 41 and a sigmoid correction capacitor 42 connected to the vertical deflection coil 41, a series connection circuit consisting of a resistor 21 and a switch 22 connected in series with each other is connected in parallel with the sigmoid correction capacitor 42. By turning the switch 22 on and off in response to a control signal having a period twice as long as a period of the vertical synchronizing signal, a current flowing through the resistor 21 and the switch 22 is periodically added to a vertical deflection current, thereby causing shift of displaying points on a screen to make the moire phenomenon unnoticeable.

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Fujisawa, Japan

Masao Yamazaki